1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _LINUX_FS_H 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _LINUX_FS_H 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This file has definitions for some important file table 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * structures etc. 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/limits.h> 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/ioctl.h> 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the file limit at runtime and only root can increase the per-process 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * nr_file rlimit, so it's safe to set up a ridiculously high absolute 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * upper limit on files-per-process. 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Some programs (notably those using select()) may have to be 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * recompiled to take full advantage of the new limits.. 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Fixed constants first: */ 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#undef NR_OPEN 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define INR_OPEN 1024 /* Initial setting for nfile rlimits */ 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLOCK_SIZE_BITS 10 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEEK_SET 0 /* seek relative to beginning of file */ 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEEK_CUR 1 /* seek relative to current file position */ 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEEK_END 2 /* seek relative to end of file */ 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* And dynamically-tunable limits and defaults: */ 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct files_stat_struct { 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_files; /* read only */ 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_free_files; /* read only */ 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int max_files; /* tunable */ 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct files_stat_struct files_stat; 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_max_files(void); 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct inodes_stat_t { 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_inodes; 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_unused; 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int dummy[5]; 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inodes_stat_t inodes_stat; 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int leases_enable, lease_break_time; 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_DNOTIFY 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int dir_notify_enable; 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NR_FILE 8192 /* this can well be larger on a larger system */ 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAY_EXEC 1 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAY_WRITE 2 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAY_READ 4 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAY_APPEND 8 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_READ 1 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_WRITE 2 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Internal kernel extensions */ 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_LSEEK 4 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_PREAD 8 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* File is being opened for execution. Primary users of this flag are 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru distributed filesystems that can use it to achieve correct ETXTBUSY 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru behavior for cross-node execution/opening_for_writing of files */ 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FMODE_EXEC 16 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RW_MASK 1 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RWA_MASK 2 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define READ 0 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define WRITE 1 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define READA 2 /* read-ahead - don't block if no resources */ 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SPECIAL 4 /* For non-blockdevice requests in request queue */ 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define READ_SYNC (READ | (1 << BIO_RW_SYNC)) 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEL_IN 1 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEL_OUT 2 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SEL_EX 4 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* public flags for file_system_type */ 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FS_REQUIRES_DEV 1 93c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FS_BINARY_MOUNTDATA 2 94c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ 95c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon 96c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * as nfs_rename() will be cleaned up 97c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 98c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 99c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * These are the fs-independent mount-flags: up to 32 flags are supported 100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_RDONLY 1 /* Mount read-only */ 102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NOSUID 2 /* Ignore suid and sgid bits */ 103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NODEV 4 /* Disallow access to device special files */ 104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NOEXEC 8 /* Disallow program execution */ 105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NOATIME 1024 /* Do not update access times. */ 110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NODIRATIME 2048 /* Do not update directory access times */ 111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_BIND 4096 112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_MOVE 8192 113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_REC 16384 114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru MS_VERBOSE is deprecated. */ 116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_SILENT 32768 117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_UNBINDABLE (1<<17) /* change to unbindable */ 119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_PRIVATE (1<<18) /* change to private */ 120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_SLAVE (1<<19) /* change to slave */ 121c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_SHARED (1<<20) /* change to shared */ 122c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_ACTIVE (1<<30) 123c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_NOUSER (1<<31) 124c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 125c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 126c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Superblock flags that can be altered by MS_REMOUNT 127c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 128c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK) 129c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 130c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 131c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Old magic mount flag and mask 132c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 133c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_MGC_VAL 0xC0ED0000 134c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MS_MGC_MSK 0xffff0000 135c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 136c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Inode flags - they have nothing to superblock flags now */ 137c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 138c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_SYNC 1 /* Writes are synced at once */ 139c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_NOATIME 2 /* Do not update access times */ 140c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_APPEND 4 /* Append-only file */ 141c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_IMMUTABLE 8 /* Immutable file */ 142c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_DEAD 16 /* removed, but still open directory */ 143c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_NOQUOTA 32 /* Inode is not counted to quota */ 144c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_DIRSYNC 64 /* Directory modifications are synchronous */ 145c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_NOCMTIME 128 /* Do not update file c/mtime */ 146c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ 147c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_PRIVATE 512 /* Inode is fs-internal */ 148c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 149c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 150c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Note that nosuid etc flags are inode-specific: setting some file-system 151c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * flags just means all the inodes inherit those flags by default. It might be 152c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * possible to override it selectively if you really wanted to with some 153c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ioctl() that is not currently implemented. 154c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 155c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Exception: MS_RDONLY is always applied to the entire file system. 156c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 157c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Unfortunately, it is possible to change a filesystems flags with it mounted 158c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * with files in use. This means that all of the inodes will not have their 159c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * i_flags updated. Hence, i_flags no longer inherit the superblock mount 160c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org 161c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 162c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) 163c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 164c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) 165c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ 166c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ((inode)->i_flags & S_SYNC)) 167c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ 168c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) 169c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) 170c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 171c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) 172c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) 173c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) 174c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) 175c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 176c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) 177c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) 178c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) 179c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) 180c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 181c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* the read-only stuff doesn't really belong here, but any other place is 182c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru probably as bad and I don't want to create yet another include file. */ 183c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 184c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 185c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 186c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKRRPART _IO(0x12,95) /* re-read partition table */ 187c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 188c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 189c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 190c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 191c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 192c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 193c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 194c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 195c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 196c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if 0 197c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKPG _IO(0x12,105)/* See blkpg.h */ 198c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 199c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Some people are morons. Do not use sizeof! */ 200c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 201c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 202c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 203c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* This was here just to show that the number is taken - 204c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 205c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 206c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* A jump here: 108-111 have been used for various private purposes. */ 207c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKBSZGET _IOR(0x12,112,size_t) 208c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKBSZSET _IOW(0x12,113,size_t) 209c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 210c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 211c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKTRACESTART _IO(0x12,116) 212c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKTRACESTOP _IO(0x12,117) 213c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKTRACETEARDOWN _IO(0x12,118) 214c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 215c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 216c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FIBMAP _IO(0x00,1) /* bmap access */ 217c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 218c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 219c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SYNC_FILE_RANGE_WAIT_BEFORE 1 220c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SYNC_FILE_RANGE_WRITE 2 221c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SYNC_FILE_RANGE_WAIT_AFTER 4 222c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 223c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __KERNEL__ 224c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 225c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/linkage.h> 226c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/wait.h> 227c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/types.h> 228c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/kdev_t.h> 229c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/dcache.h> 230c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/stat.h> 231c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/cache.h> 232c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/kobject.h> 233c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/list.h> 234c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/radix-tree.h> 235c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/prio_tree.h> 236c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/init.h> 237c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/sched.h> 238c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/mutex.h> 239c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 240c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/atomic.h> 241c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/semaphore.h> 242c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/byteorder.h> 243c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 244c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct hd_geometry; 245c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct iovec; 246c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct nameidata; 247c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct kiocb; 248c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct pipe_inode_info; 249c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct poll_table_struct; 250c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct kstatfs; 251c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct vm_area_struct; 252c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct vfsmount; 253c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 254c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init inode_init(unsigned long); 255c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init inode_init_early(void); 256c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init mnt_init(unsigned long); 257c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init files_init(unsigned long); 258c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 259c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct buffer_head; 260c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (get_block_t)(struct inode *inode, sector_t iblock, 261c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct buffer_head *bh_result, int create); 262c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, 263c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t bytes, void *private); 264c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 265c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 266c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Attribute flags. These should be or-ed together to figure out what 267c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * has been changed! 268c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 269c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_MODE 1 270c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_UID 2 271c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_GID 4 272c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_SIZE 8 273c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_ATIME 16 274c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_MTIME 32 275c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_CTIME 64 276c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_ATIME_SET 128 277c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_MTIME_SET 256 278c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_FORCE 512 /* Not a change, but a change it */ 279c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_ATTR_FLAG 1024 280c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_KILL_SUID 2048 281c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_KILL_SGID 4096 282c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ATTR_FILE 8192 283c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 284c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 285c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is the Inode Attributes structure, used for notify_change(). It 286c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * uses the above definitions as flags, to know which values have changed. 287c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Also, in this manner, a Filesystem can look at only the values it cares 288c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * about. Basically, these are the attributes that the VFS layer can 289c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * request to change from the FS layer. 290c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 291c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Derek Atkins <warlord@MIT.EDU> 94-10-20 292c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 293c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct iattr { 294c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int ia_valid; 295c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru umode_t ia_mode; 296c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru uid_t ia_uid; 297c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru gid_t ia_gid; 298c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t ia_size; 299c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec ia_atime; 300c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec ia_mtime; 301c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec ia_ctime; 302c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 303c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 304c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Not an attribute, but an auxilary info for filesystems wanting to 305c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * implement an ftruncate() like method. NOTE: filesystem should 306c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). 307c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 308c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *ia_file; 309c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 310c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 311c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 312c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Includes for diskquotas. 313c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 314c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/quota.h> 315c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 316c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/** 317c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * enum positive_aop_returns - aop return codes with specific semantics 318c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 319c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has 320c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * completed, that the page is still locked, and 321c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * should be considered active. The VM uses this hint 322c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to return the page to the active list -- it won't 323c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * be a candidate for writeback again in the near 324c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * future. Other callers must be careful to unlock 325c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the page if they get this return. Returned by 326c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * writepage(); 327c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 328c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has 329c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * unlocked it and the page might have been truncated. 330c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The caller should back up to acquiring a new page and 331c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * trying again. The aop will be taking reasonable 332c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * precautions not to livelock. If the caller held a page 333c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * reference, it should drop it before retrying. Returned 334c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * by readpage(), prepare_write(), and commit_write(). 335c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 336c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * address_space_operation functions return these large constants to indicate 337c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * special semantics to the caller. These are much larger than the bytes in a 338c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * page to allow for functions that return the number of bytes operated on in a 339c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * given page. 340c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 341c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 342c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum positive_aop_returns { 343c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru AOP_WRITEPAGE_ACTIVATE = 0x80000, 344c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru AOP_TRUNCATED_PAGE = 0x80001, 345c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 346c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 347c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 348c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * oh the beauties of C type declarations. 349c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 350c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct page; 351c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct address_space; 352c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct writeback_control; 353c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 354c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct address_space_operations { 355c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*writepage)(struct page *page, struct writeback_control *wbc); 356c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*readpage)(struct file *, struct page *); 357c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*sync_page)(struct page *); 358c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 359c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Write back some dirty pages from this mapping. */ 360c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*writepages)(struct address_space *, struct writeback_control *); 361c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 362c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Set a page dirty. Return true if this dirtied it */ 363c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*set_page_dirty)(struct page *page); 364c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 365c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*readpages)(struct file *filp, struct address_space *mapping, 366c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head *pages, unsigned nr_pages); 367c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 368c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 369c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ext3 requires that a successful prepare_write() call be followed 370c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * by a commit_write() call - they must be balanced 371c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 372c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); 373c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*commit_write)(struct file *, struct page *, unsigned, unsigned); 374c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ 375c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t (*bmap)(struct address_space *, sector_t); 376c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*invalidatepage) (struct page *, unsigned long); 377c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*releasepage) (struct page *, gfp_t); 378c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, 379c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t offset, unsigned long nr_segs); 380c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct page* (*get_xip_page)(struct address_space *, sector_t, 381c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int); 382c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* migrate the contents of a page to the specified target */ 383c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*migratepage) (struct address_space *, 384c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct page *, struct page *); 385c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 386c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 387c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct backing_dev_info; 388c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct address_space { 389c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *host; /* owner: inode, block_device */ 390c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct radix_tree_root page_tree; /* radix tree of all pages */ 391c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru rwlock_t tree_lock; /* and rwlock protecting it */ 392c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int i_mmap_writable;/* count VM_SHARED mappings */ 393c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct prio_tree_root i_mmap; /* tree of private and shared mappings */ 394c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ 395c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t i_mmap_lock; /* protect tree, count, list */ 396c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int truncate_count; /* Cover race condition with truncate */ 397c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nrpages; /* number of total pages */ 398c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgoff_t writeback_index;/* writeback starts here */ 399c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const struct address_space_operations *a_ops; /* methods */ 400c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long flags; /* error bits/gfp mask */ 401c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct backing_dev_info *backing_dev_info; /* device readahead, etc */ 402c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t private_lock; /* for use by the address_space */ 403c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head private_list; /* ditto */ 404c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct address_space *assoc_mapping; /* ditto */ 405c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} __attribute__((aligned(sizeof(long)))); 406c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 407c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * On most architectures that alignment is already the case; but 408c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * must be enforced here for CRIS, to let the least signficant bit 409c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. 410c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 411c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 412c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct block_device { 413c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dev_t bd_dev; /* not a kdev_t - it's a search key */ 414c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode * bd_inode; /* will die */ 415c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int bd_openers; 416c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex bd_mutex; /* open/close mutex */ 417c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex bd_mount_mutex; /* mount mutex */ 418c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head bd_inodes; 419c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void * bd_holder; 420c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int bd_holders; 421c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SYSFS 422c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head bd_holder_list; 423c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 424c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct block_device * bd_contains; 425c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned bd_block_size; 426c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct hd_struct * bd_part; 427c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* number of times partitions within this device have been opened. */ 428c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned bd_part_count; 429c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int bd_invalidated; 430c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct gendisk * bd_disk; 431c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head bd_list; 432c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct backing_dev_info *bd_inode_backing_dev_info; 433c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 434c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Private data. You must have bd_claim'ed the block_device 435c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to use this. NOTE: bd_claim allows an owner to claim 436c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the same device multiple times, the owner must take special 437c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * care to not mess up bd_private for that case. 438c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 439c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long bd_private; 440c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 441c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 442c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 443c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * bdev->bd_mutex nesting subclasses for the lock validator: 444c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 445c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 0: normal 446c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1: 'whole' 447c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 2: 'partition' 448c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 449c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum bdev_bd_mutex_lock_class 450c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 451c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru BD_MUTEX_NORMAL, 452c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru BD_MUTEX_WHOLE, 453c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru BD_MUTEX_PARTITION 454c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 455c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 456c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 457c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 458c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Radix-tree tags, for tagging dirty and writeback pages within the pagecache 459c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * radix trees 460c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 461c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PAGECACHE_TAG_DIRTY 0 462c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PAGECACHE_TAG_WRITEBACK 1 463c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 464c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint mapping_tagged(struct address_space *mapping, int tag); 465c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 466c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 467c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Might pages of this file be mapped into userspace? 468c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 469c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int mapping_mapped(struct address_space *mapping) 470c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 471c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return !prio_tree_empty(&mapping->i_mmap) || 472c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru !list_empty(&mapping->i_mmap_nonlinear); 473c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 474c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 475c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 476c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Might pages of this file have been modified in userspace? 477c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff 478c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * marks vma as VM_SHARED if it is shared, and the file was opened for 479c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * writing i.e. vma may be mprotected writable even if now readonly. 480c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 481c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int mapping_writably_mapped(struct address_space *mapping) 482c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 483c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return mapping->i_mmap_writable != 0; 484c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 485c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 486c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 487c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Use sequence counter to get consistent i_size on 32-bit processors. 488c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 489c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG==32 && defined(CONFIG_SMP) 490c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/seqlock.h> 491c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __NEED_I_SIZE_ORDERED 492c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) 493c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 494c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define i_size_ordered_init(inode) do { } while (0) 495c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 496c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 497c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct inode { 498c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct hlist_node i_hash; 499c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head i_list; 500c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head i_sb_list; 501c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head i_dentry; 502c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long i_ino; 503c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t i_count; 504c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru umode_t i_mode; 505c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int i_nlink; 506c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru uid_t i_uid; 507c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru gid_t i_gid; 508c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dev_t i_rdev; 509c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t i_size; 510c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec i_atime; 511c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec i_mtime; 512c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timespec i_ctime; 513c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int i_blkbits; 514c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long i_blksize; 515c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long i_version; 516c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru blkcnt_t i_blocks; 517c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short i_bytes; 518c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ 519c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex i_mutex; 520c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct rw_semaphore i_alloc_sem; 521c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode_operations *i_op; 522c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ 523c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct super_block *i_sb; 524c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_lock *i_flock; 525c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct address_space *i_mapping; 526c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct address_space i_data; 527c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_QUOTA 528c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dquot *i_dquot[MAXQUOTAS]; 529c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 530c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* These three should probably be a union */ 531c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head i_devices; 532c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct pipe_inode_info *i_pipe; 533c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct block_device *i_bdev; 534c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct cdev *i_cdev; 535c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int i_cindex; 536c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 537c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 i_generation; 538c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 539c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_DNOTIFY 540c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long i_dnotify_mask; /* Directory notify events */ 541c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dnotify_struct *i_dnotify; /* for directory notifications */ 542c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 543c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 544c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_INOTIFY 545c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head inotify_watches; /* watches on this inode */ 546c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex inotify_mutex; /* protects the watches list */ 547c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 548c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 549c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long i_state; 550c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long dirtied_when; /* jiffies of first dirtying */ 551c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 552c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int i_flags; 553c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 554c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t i_writecount; 555c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *i_security; 556c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru union { 557c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *generic_ip; 558c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } u; 559c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __NEED_I_SIZE_ORDERED 560c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru seqcount_t i_size_seqcount; 561c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 562c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 563c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 564c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 565c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * inode->i_mutex nesting subclasses for the lock validator: 566c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 567c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 0: the object of the current VFS operation 568c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1: parent 569c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 2: child/target 570c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 3: quota file 571c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 572c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The locking order between these classes is 573c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * parent -> child -> normal -> xattr -> quota 574c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 575c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum inode_i_mutex_lock_class 576c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 577c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru I_MUTEX_NORMAL, 578c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru I_MUTEX_PARENT, 579c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru I_MUTEX_CHILD, 580c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru I_MUTEX_XATTR, 581c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru I_MUTEX_QUOTA 582c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 583c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 584c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 585c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE: in a 32bit arch with a preemptable kernel and 586c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * an UP compile the i_size_read/write must be atomic 587c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * with respect to the local cpu (unlike with preempt disabled), 588c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * but they don't need to be atomic with respect to other cpus like in 589c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * true SMP (so they need either to either locally disable irq around 590c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the read or for example on x86 they can be still implemented as a 591c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * cmpxchg8b without the need of the lock prefix). For SMP compiles 592c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * and 64bit archs it makes no difference if preempt is enabled or not. 593c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 594c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline loff_t i_size_read(struct inode *inode) 595c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 596c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG==32 && defined(CONFIG_SMP) 597c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t i_size; 598c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int seq; 599c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 600c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru do { 601c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru seq = read_seqcount_begin(&inode->i_size_seqcount); 602c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru i_size = inode->i_size; 603c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); 604c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return i_size; 605c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 606c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t i_size; 607c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 608c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru preempt_disable(); 609c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru i_size = inode->i_size; 610c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru preempt_enable(); 611c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return i_size; 612c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 613c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return inode->i_size; 614c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 615c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 616c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 617c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 618c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void i_size_write(struct inode *inode, loff_t i_size) 619c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 620c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG==32 && defined(CONFIG_SMP) 621c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru write_seqcount_begin(&inode->i_size_seqcount); 622c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru inode->i_size = i_size; 623c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru write_seqcount_end(&inode->i_size_seqcount); 624c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 625c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru preempt_disable(); 626c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru inode->i_size = i_size; 627c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru preempt_enable(); 628c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 629c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru inode->i_size = i_size; 630c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 631c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 632c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 633c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline unsigned iminor(struct inode *inode) 634c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 635c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return MINOR(inode->i_rdev); 636c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 637c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 638c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline unsigned imajor(struct inode *inode) 639c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 640c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return MAJOR(inode->i_rdev); 641c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 642c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 643c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *I_BDEV(struct inode *inode); 644c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 645c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct fown_struct { 646c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru rwlock_t lock; /* protects pid, uid, euid fields */ 647c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int pid; /* pid or -pgrp where SIGIO should be sent */ 648c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru uid_t uid, euid; /* uid/euid of process setting the owner */ 649c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *security; 650c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int signum; /* posix.1b rt signal to be delivered on IO */ 651c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 652c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 653c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 654c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Track a single file's readahead state 655c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 656c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file_ra_state { 657c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long start; /* Current window */ 658c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long size; 659c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long flags; /* ra flags RA_FLAG_xxx*/ 660c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long cache_hit; /* cache hit count*/ 661c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long prev_page; /* Cache last read() position */ 662c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ahead_start; /* Ahead window */ 663c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ahead_size; 664c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ra_pages; /* Maximum readahead window */ 665c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ 666c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ 667c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 668c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ 669c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RA_FLAG_INCACHE 0x02 /* file is already in cache */ 670c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 671c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file { 672c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 673c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * fu_list becomes invalid after file_free is called and queued via 674c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * fu_rcuhead for RCU freeing 675c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 676c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru union { 677c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head fu_list; 678c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct rcu_head fu_rcuhead; 679c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } f_u; 680c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry *f_dentry; 681c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *f_vfsmnt; 682c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const struct file_operations *f_op; 683c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t f_count; 684c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int f_flags; 685c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mode_t f_mode; 686c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t f_pos; 687c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct fown_struct f_owner; 688c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int f_uid, f_gid; 689c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_ra_state f_ra; 690c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 691c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long f_version; 692c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *f_security; 693c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 694c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* needed for tty driver, and maybe others */ 695c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *private_data; 696c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 697c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_EPOLL 698c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Used by fs/eventpoll.c to link all the hooks to this file */ 699c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head f_ep_links; 700c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t f_ep_lock; 701c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* #ifdef CONFIG_EPOLL */ 702c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct address_space *f_mapping; 703c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 704c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern spinlock_t files_lock; 705c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define file_list_lock() spin_lock(&files_lock); 706c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define file_list_unlock() spin_unlock(&files_lock); 707c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 708c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define get_file(x) atomic_inc(&(x)->f_count) 709c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define file_count(x) atomic_read(&(x)->f_count) 710c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 711c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_NON_LFS ((1UL<<31) - 1) 712c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 713c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Page cache limit. The filesystems should put that into their s_maxbytes 714c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru limits, otherwise bad things can happen in VM. */ 715c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG==32 716c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 717c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#elif BITS_PER_LONG==64 718c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL 719c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 720c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 721c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_POSIX 1 722c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_FLOCK 2 723c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_ACCESS 8 /* not trying to lock, just looking */ 724c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_EXISTS 16 /* when unlocking, test for existence */ 725c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_LEASE 32 /* lease held on this file */ 726c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_CLOSE 64 /* unlock on close */ 727c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FL_SLEEP 128 /* A blocking lock */ 728c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 729c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 730c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The POSIX file lock owner is determined by 731c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the "struct files_struct" in the thread group 732c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (or NULL for no owner - BSD locks). 733c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 734c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Lockd stuffs a "host" pointer into this. 735c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 736c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct files_struct *fl_owner_t; 737c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 738c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file_lock_operations { 739c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_insert)(struct file_lock *); /* lock insertion callback */ 740c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_remove)(struct file_lock *); /* lock removal callback */ 741c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_copy_lock)(struct file_lock *, struct file_lock *); 742c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_release_private)(struct file_lock *); 743c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 744c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 745c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct lock_manager_operations { 746c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fl_compare_owner)(struct file_lock *, struct file_lock *); 747c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_notify)(struct file_lock *); /* unblock callback */ 748c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_copy_lock)(struct file_lock *, struct file_lock *); 749c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_release_private)(struct file_lock *); 750c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*fl_break)(struct file_lock *); 751c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fl_mylease)(struct file_lock *, struct file_lock *); 752c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fl_change)(struct file_lock **, int); 753c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 754c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 755c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* that will die - we need it for nfs_lock_info */ 756c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/nfs_fs_i.h> 757c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 758c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file_lock { 759c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_lock *fl_next; /* singly linked list for this inode */ 760c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head fl_link; /* doubly linked list of all locks */ 761c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head fl_block; /* circular list of blocked processes */ 762c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru fl_owner_t fl_owner; 763c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int fl_pid; 764c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t fl_wait; 765c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *fl_file; 766c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned char fl_flags; 767c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned char fl_type; 768c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t fl_start; 769c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t fl_end; 770c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 771c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct fasync_struct * fl_fasync; /* for lease break notifications */ 772c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long fl_break_time; /* for nonblocking lease breaks */ 773c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 774c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ 775c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ 776c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru union { 777c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct nfs_lock_info nfs_fl; 778c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct nfs4_lock_info nfs4_fl; 779c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } fl_u; 780c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 781c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 782c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* The following constant reflects the upper bound of the file/locking space */ 783c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef OFFSET_MAX 784c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) 785c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define OFFSET_MAX INT_LIMIT(loff_t) 786c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define OFFT_OFFSET_MAX INT_LIMIT(off_t) 787c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 788c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 789c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/fcntl.h> 790c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 791c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_getlk(struct file *, struct flock __user *); 792c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_setlk(unsigned int, struct file *, unsigned int, 793c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct flock __user *); 794c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 795c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG == 32 796c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_getlk64(struct file *, struct flock64 __user *); 797c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_setlk64(unsigned int, struct file *, unsigned int, 798c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct flock64 __user *); 799c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 800c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 801c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void send_sigio(struct fown_struct *fown, int fd, int band); 802c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); 803c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fcntl_getlease(struct file *filp); 804c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 805c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/sync.c */ 806c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte, 807c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int flags); 808c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 809c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/locks.c */ 810c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void locks_init_lock(struct file_lock *); 811c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void locks_copy_lock(struct file_lock *, struct file_lock *); 812c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void locks_remove_posix(struct file *, fl_owner_t); 813c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void locks_remove_flock(struct file *); 814c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *); 815c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *); 816c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int posix_lock_file(struct file *, struct file_lock *); 817c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int posix_lock_file_wait(struct file *, struct file_lock *); 818c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int posix_unblock_lock(struct file *, struct file_lock *); 819c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); 820c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __break_lease(struct inode *inode, unsigned int flags); 821c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void lease_get_mtime(struct inode *, struct timespec *time); 822c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int setlease(struct file *, long, struct file_lock **); 823c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int lease_modify(struct file_lock **, int); 824c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int lock_may_read(struct inode *, loff_t start, unsigned long count); 825c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int lock_may_write(struct inode *, loff_t start, unsigned long count); 826c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 827c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct fasync_struct { 828c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int magic; 829c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int fa_fd; 830c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct fasync_struct *fa_next; /* singly linked list */ 831c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *fa_file; 832c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 833c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 834c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FASYNC_MAGIC 0x4601 835c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 836c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* SMP safe fasync helpers: */ 837c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fasync_helper(int, struct file *, int, struct fasync_struct **); 838c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* can be called from interrupts */ 839c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void kill_fasync(struct fasync_struct **, int, int); 840c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* only for net: no internal synchronization */ 841c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __kill_fasync(struct fasync_struct *, int, int); 842c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 843c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int f_setown(struct file *filp, unsigned long arg, int force); 844c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void f_delown(struct file *filp); 845c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int send_sigurg(struct fown_struct *fown); 846c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 847c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 848c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Umount options 849c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 850c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 851c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ 852c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MNT_DETACH 0x00000002 /* Just detach from the tree */ 853c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MNT_EXPIRE 0x00000004 /* Mark for expiry */ 854c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 855c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct list_head super_blocks; 856c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern spinlock_t sb_lock; 857c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 858c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define sb_entry(list) list_entry((list), struct super_block, s_list) 859c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define S_BIAS (1<<30) 860c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct super_block { 861c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_list; /* Keep this first */ 862c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dev_t s_dev; /* search index; _not_ kdev_t */ 863c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long s_blocksize; 864c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned char s_blocksize_bits; 865c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned char s_dirt; 866c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long long s_maxbytes; /* Max file size */ 867c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_system_type *s_type; 868c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct super_operations *s_op; 869c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dquot_operations *dq_op; 870c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct quotactl_ops *s_qcop; 871c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct export_operations *s_export_op; 872c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long s_flags; 873c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long s_magic; 874c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry *s_root; 875c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct rw_semaphore s_umount; 876c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex s_lock; 877c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int s_count; 878c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int s_syncing; 879c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int s_need_sync_fs; 880c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t s_active; 881c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *s_security; 882c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct xattr_handler **s_xattr; 883c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 884c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_inodes; /* all inodes */ 885c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_dirty; /* dirty inodes */ 886c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_io; /* parked for writeback */ 887c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ 888c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_files; 889c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 890c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct block_device *s_bdev; 891c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head s_instances; 892c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct quota_info s_dquot; /* Diskquota specific options */ 893c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 894c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int s_frozen; 895c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t s_wait_unfrozen; 896c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 897c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char s_id[32]; /* Informational name */ 898c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 899c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *s_fs_info; /* Filesystem private info */ 900c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 901c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 902c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The next field is for VFS *only*. No filesystems have any business 903c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * even looking at it. You had been warned. 904c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 905c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex s_vfs_rename_mutex; /* Kludge */ 906c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 907c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Granularity of c/m/atime in ns. 908c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru Cannot be worse than a second */ 909c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru u32 s_time_gran; 910c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 911c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 912c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct timespec current_fs_time(struct super_block *sb); 913c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 914c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 915c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Snapshotting support. 916c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 917c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum { 918c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru SB_UNFROZEN = 0, 919c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru SB_FREEZE_WRITE = 1, 920c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru SB_FREEZE_TRANS = 2, 921c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 922c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 923c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define vfs_check_frozen(sb, level) \ 924c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) 925c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 926c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void get_fs_excl(void) 927c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 928c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_inc(¤t->fs_excl); 929c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 930c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 931c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void put_fs_excl(void) 932c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 933c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_dec(¤t->fs_excl); 934c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 935c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 936c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int has_fs_excl(void) 937c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 938c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return atomic_read(¤t->fs_excl); 939c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 940c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 941c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 942c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 943c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Superblock locking. 944c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 945c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void lock_super(struct super_block * sb) 946c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 947c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru get_fs_excl(); 948c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mutex_lock(&sb->s_lock); 949c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 950c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 951c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void unlock_super(struct super_block * sb) 952c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 953c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru put_fs_excl(); 954c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mutex_unlock(&sb->s_lock); 955c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 956c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 957c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 958c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * VFS helper functions.. 959c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 960c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_permission(struct nameidata *, int); 961c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); 962c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_mkdir(struct inode *, struct dentry *, int); 963c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); 964c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_symlink(struct inode *, struct dentry *, const char *, int); 965c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_link(struct dentry *, struct inode *, struct dentry *); 966c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_rmdir(struct inode *, struct dentry *); 967c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_unlink(struct inode *, struct dentry *); 968c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 969c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 970c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 971c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * VFS dentry helper functions. 972c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 973c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void dentry_unhash(struct dentry *dentry); 974c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 975c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 976c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * VFS file helper functions. 977c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 978c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int file_permission(struct file *, int); 979c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 980c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 981c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * File types 982c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 983c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE! These match bits 12..15 of stat.st_mode 984c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (ie "(i_mode >> 12) & 15"). 985c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 986c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_UNKNOWN 0 987c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_FIFO 1 988c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_CHR 2 989c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_DIR 4 990c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_BLK 6 991c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_REG 8 992c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_LNK 10 993c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_SOCK 12 994c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DT_WHT 14 995c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 996c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define OSYNC_METADATA (1<<0) 997c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define OSYNC_DATA (1<<1) 998c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define OSYNC_INODE (1<<2) 999c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint generic_osync_inode(struct inode *, struct address_space *, int); 1000c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1001c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1002c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is the "filldir" function type, used by readdir() to let 1003c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the kernel specify what kind of dirent layout it wants to have. 1004c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This allows the kernel to read directories into kernel space or 1005c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to have different dirent layouts depending on the binary type. 1006c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1007c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); 1008c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1009c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct block_device_operations { 1010c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*open) (struct inode *, struct file *); 1011c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*release) (struct inode *, struct file *); 1012c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); 1013c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); 1014c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru long (*compat_ioctl) (struct file *, unsigned, unsigned long); 1015c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*direct_access) (struct block_device *, sector_t, unsigned long *); 1016c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*media_changed) (struct gendisk *); 1017c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*revalidate_disk) (struct gendisk *); 1018c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*getgeo)(struct block_device *, struct hd_geometry *); 1019c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct module *owner; 1020c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1021c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1022c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1023c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * "descriptor" for what we're up to with a read for sendfile(). 1024c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This allows us to use the same read code yet 1025c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * have multiple different users of the data that 1026c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * we read from a file. 1027c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1028c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The simplest case just copies the data to user 1029c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * mode. 1030c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1031c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct { 1032c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t written; 1033c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t count; 1034c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru union { 1035c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char __user * buf; 1036c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *data; 1037c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } arg; 1038c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int error; 1039c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} read_descriptor_t; 1040c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1041c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); 1042c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1043c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* These macros are for out of kernel modules to test that 1044c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the kernel supports the unlocked_ioctl and compat_ioctl 1045c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * fields in struct file_operations. */ 1046c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define HAVE_COMPAT_IOCTL 1 1047c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define HAVE_UNLOCKED_IOCTL 1 1048c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1049c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1050c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE: 1051c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl 1052c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * can be called without the big kernel lock held in all filesystems. 1053c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1054c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file_operations { 1055c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct module *owner; 1056c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t (*llseek) (struct file *, loff_t, int); 1057c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); 1058c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); 1059c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); 1060c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); 1061c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*readdir) (struct file *, void *, filldir_t); 1062c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int (*poll) (struct file *, struct poll_table_struct *); 1063c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); 1064c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); 1065c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru long (*compat_ioctl) (struct file *, unsigned int, unsigned long); 1066c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*mmap) (struct file *, struct vm_area_struct *); 1067c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*open) (struct inode *, struct file *); 1068c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*flush) (struct file *, fl_owner_t id); 1069c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*release) (struct inode *, struct file *); 1070c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fsync) (struct file *, struct dentry *, int datasync); 1071c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*aio_fsync) (struct kiocb *, int datasync); 1072c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fasync) (int, struct file *, int); 1073c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*lock) (struct file *, int, struct file_lock *); 1074c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); 1075c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); 1076c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); 1077c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); 1078c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 1079c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*check_flags)(int); 1080c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*dir_notify)(struct file *filp, unsigned long arg); 1081c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*flock) (struct file *, int, struct file_lock *); 1082c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 1083c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); 1084c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1085c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1086c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct inode_operations { 1087c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*create) (struct inode *,struct dentry *,int, struct nameidata *); 1088c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); 1089c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*link) (struct dentry *,struct inode *,struct dentry *); 1090c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*unlink) (struct inode *,struct dentry *); 1091c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*symlink) (struct inode *,struct dentry *,const char *); 1092c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*mkdir) (struct inode *,struct dentry *,int); 1093c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*rmdir) (struct inode *,struct dentry *); 1094c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*mknod) (struct inode *,struct dentry *,int,dev_t); 1095c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*rename) (struct inode *, struct dentry *, 1096c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *, struct dentry *); 1097c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*readlink) (struct dentry *, char __user *,int); 1098c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void * (*follow_link) (struct dentry *, struct nameidata *); 1099c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*put_link) (struct dentry *, struct nameidata *, void *); 1100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*truncate) (struct inode *); 1101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*permission) (struct inode *, int, struct nameidata *); 1102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*setattr) (struct dentry *, struct iattr *); 1103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); 1104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); 1105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); 1106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*listxattr) (struct dentry *, char *, size_t); 1107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*removexattr) (struct dentry *, const char *); 1108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*truncate_range)(struct inode *, loff_t, loff_t); 1109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct seq_file; 1112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); 1114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); 1115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t vfs_readv(struct file *, const struct iovec __user *, 1116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long, loff_t *); 1117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t vfs_writev(struct file *, const struct iovec __user *, 1118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long, loff_t *); 1119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1121c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called 1122c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * without the big kernel lock held in all filesystems. 1123c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1124c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct super_operations { 1125c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *(*alloc_inode)(struct super_block *sb); 1126c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*destroy_inode)(struct inode *); 1127c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1128c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*read_inode) (struct inode *); 1129c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1130c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*dirty_inode) (struct inode *); 1131c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*write_inode) (struct inode *, int); 1132c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*put_inode) (struct inode *); 1133c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*drop_inode) (struct inode *); 1134c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*delete_inode) (struct inode *); 1135c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*put_super) (struct super_block *); 1136c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*write_super) (struct super_block *); 1137c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*sync_fs)(struct super_block *sb, int wait); 1138c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*write_super_lockfs) (struct super_block *); 1139c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*unlockfs) (struct super_block *); 1140c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*statfs) (struct dentry *, struct kstatfs *); 1141c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*remount_fs) (struct super_block *, int *, char *); 1142c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*clear_inode) (struct inode *); 1143c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*umount_begin) (struct vfsmount *, int); 1144c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1145c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*show_options)(struct seq_file *, struct vfsmount *); 1146c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*show_stats)(struct seq_file *, struct vfsmount *); 1147c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1148c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); 1149c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); 1150c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1151c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1152c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Inode state bits. Protected by inode_lock. */ 1153c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ 1154c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ 1155c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ 1156c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __I_LOCK 3 1157c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_LOCK (1 << __I_LOCK) 1158c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_FREEING 16 1159c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_CLEAR 32 1160c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_NEW 64 1161c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_WILL_FREE 128 1162c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1163c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) 1164c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1165c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __mark_inode_dirty(struct inode *, int); 1166c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void mark_inode_dirty(struct inode *inode) 1167c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1168c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __mark_inode_dirty(inode, I_DIRTY); 1169c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1170c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1171c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void mark_inode_dirty_sync(struct inode *inode) 1172c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1173c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __mark_inode_dirty(inode, I_DIRTY_SYNC); 1174c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1175c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1176c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void inode_inc_link_count(struct inode *inode) 1177c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1178c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru inode->i_nlink++; 1179c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mark_inode_dirty(inode); 1180c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1181c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1182c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void inode_dec_link_count(struct inode *inode) 1183c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1184c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru inode->i_nlink--; 1185c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mark_inode_dirty(inode); 1186c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1187c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1188c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); 1189c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void file_accessed(struct file *file) 1190c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1191c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (!(file->f_flags & O_NOATIME)) 1192c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru touch_atime(file->f_vfsmnt, file->f_dentry); 1193c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1194c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1195c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint sync_inode(struct inode *inode, struct writeback_control *wbc); 1196c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1197c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/** 1198c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * struct export_operations - for nfsd to communicate with file systems 1199c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @decode_fh: decode a file handle fragment and return a &struct dentry 1200c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @encode_fh: encode a file handle fragment from a dentry 1201c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @get_name: find the name for a given inode in a given directory 1202c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @get_parent: find the parent of a given directory 1203c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @get_dentry: find a dentry for the inode given a file handle sub-fragment 1204c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @find_exported_dentry: 1205c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * set by the exporting module to a standard helper function. 1206c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1207c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Description: 1208c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The export_operations structure provides a means for nfsd to communicate 1209c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * with a particular exported file system - particularly enabling nfsd and 1210c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the filesystem to co-operate when dealing with file handles. 1211c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1212c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * export_operations contains two basic operation for dealing with file 1213c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * handles, decode_fh() and encode_fh(), and allows for some other 1214c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * operations to be defined which standard helper routines use to get 1215c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * specific information from the filesystem. 1216c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1217c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * nfsd encodes information use to determine which filesystem a filehandle 1218c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * applies to in the initial part of the file handle. The remainder, termed 1219c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * a file handle fragment, is controlled completely by the filesystem. The 1220c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * standard helper routines assume that this fragment will contain one or 1221c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * two sub-fragments, one which identifies the file, and one which may be 1222c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * used to identify the (a) directory containing the file. 1223c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1224c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * In some situations, nfsd needs to get a dentry which is connected into a 1225c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * specific part of the file tree. To allow for this, it passes the 1226c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * function acceptable() together with a @context which can be used to see 1227c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * if the dentry is acceptable. As there can be multiple dentrys for a 1228c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * given file, the filesystem should check each one for acceptability before 1229c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * looking for the next. As soon as an acceptable one is found, it should 1230c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * be returned. 1231c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1232c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * decode_fh: 1233c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @decode_fh is given a &struct super_block (@sb), a file handle fragment 1234c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (@fh, @fh_len) and an acceptability testing function (@acceptable, 1235c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @context). It should return a &struct dentry which refers to the same 1236c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * file that the file handle fragment refers to, and which passes the 1237c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * acceptability test. If it cannot, it should return a %NULL pointer if 1238c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the file was found but no acceptable &dentries were available, or a 1239c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or 1240c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * %ENOMEM). 1241c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1242c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * encode_fh: 1243c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @encode_fh should store in the file handle fragment @fh (using at most 1244c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @max_len bytes) information that can be used by @decode_fh to recover the 1245c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * file refered to by the &struct dentry @de. If the @connectable flag is 1246c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * set, the encode_fh() should store sufficient information so that a good 1247c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * attempt can be made to find not only the file but also it's place in the 1248c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * filesystem. This typically means storing a reference to de->d_parent in 1249c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the filehandle fragment. encode_fh() should return the number of bytes 1250c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * stored or a negative error code such as %-ENOSPC 1251c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1252c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * get_name: 1253c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @get_name should find a name for the given @child in the given @parent 1254c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * directory. The name should be stored in the @name (with the 1255c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * understanding that it is already pointing to a a %NAME_MAX+1 sized 1256c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * buffer. get_name() should return %0 on success, a negative error code 1257c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * or error. @get_name will be called without @parent->i_mutex held. 1258c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1259c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * get_parent: 1260c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @get_parent should find the parent directory for the given @child which 1261c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * is also a directory. In the event that it cannot be found, or storage 1262c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * space cannot be allocated, a %ERR_PTR should be returned. 1263c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1264c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * get_dentry: 1265c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Given a &super_block (@sb) and a pointer to a file-system specific inode 1266c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * identifier, possibly an inode number, (@inump) get_dentry() should find 1267c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the identified inode and return a dentry for that inode. Any suitable 1268c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * dentry can be returned including, if necessary, a new dentry created with 1269c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * d_alloc_root. The caller can then find any other extant dentrys by 1270c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * following the d_alias links. If a new dentry was created using 1271c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry 1272c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * should be d_rehash()ed. 1273c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1274c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code 1275c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * can be returned. The @inump will be whatever was passed to 1276c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * nfsd_find_fh_dentry() in either the @obj or @parent parameters. 1277c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1278c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Locking rules: 1279c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * get_parent is called with child->d_inode->i_mutex down 1280c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * get_name is not (which is possibly inconsistent) 1281c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1282c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1283c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct export_operations { 1284c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, 1285c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*acceptable)(void *context, struct dentry *de), 1286c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *context); 1287c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, 1288c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int connectable); 1289c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1290c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* the following are only called from the filesystem itself */ 1291c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*get_name)(struct dentry *parent, char *name, 1292c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry *child); 1293c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry * (*get_parent)(struct dentry *child); 1294c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry * (*get_dentry)(struct super_block *sb, void *inump); 1295c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1296c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* This is set by the exporting module to a standard helper */ 1297c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct dentry * (*find_exported_dentry)( 1298c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct super_block *sb, void *obj, void *parent, 1299c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*acceptable)(void *context, struct dentry *de), 1300c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *context); 1301c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1302c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1303c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1304c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1305c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct dentry * 1306c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querufind_exported_dentry(struct super_block *sb, void *obj, void *parent, 1307c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*acceptable)(void *context, struct dentry *de), 1308c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *context); 1309c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1310c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file_system_type { 1311c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const char *name; 1312c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int fs_flags; 1313c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*get_sb) (struct file_system_type *, int, 1314c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const char *, void *, struct vfsmount *); 1315c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*kill_sb) (struct super_block *); 1316c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct module *owner; 1317c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_system_type * next; 1318c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head fs_supers; 1319c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct lock_class_key s_lock_key; 1320c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct lock_class_key s_umount_key; 1321c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1322c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1323c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_sb_bdev(struct file_system_type *fs_type, 1324c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int flags, const char *dev_name, void *data, 1325c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fill_super)(struct super_block *, void *, int), 1326c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *mnt); 1327c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_sb_single(struct file_system_type *fs_type, 1328c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int flags, void *data, 1329c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fill_super)(struct super_block *, void *, int), 1330c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *mnt); 1331c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_sb_nodev(struct file_system_type *fs_type, 1332c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int flags, void *data, 1333c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*fill_super)(struct super_block *, void *, int), 1334c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *mnt); 1335c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid generic_shutdown_super(struct super_block *sb); 1336c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid kill_block_super(struct super_block *sb); 1337c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid kill_anon_super(struct super_block *sb); 1338c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid kill_litter_super(struct super_block *sb); 1339c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid deactivate_super(struct super_block *sb); 1340c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint set_anon_super(struct super_block *s, void *data); 1341c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct super_block *sget(struct file_system_type *type, 1342c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*test)(struct super_block *,void *), 1343c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*set)(struct super_block *,void *), 1344c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *data); 1345c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_sb_pseudo(struct file_system_type *, char *, 1346c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct super_operations *ops, unsigned long, 1347c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *mnt); 1348c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); 1349c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint __put_super(struct super_block *sb); 1350c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint __put_super_and_need_restart(struct super_block *sb); 1351c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid unnamed_dev_init(void); 1352c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1353c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Alas, no aliases. Too much hassle with bringing module.h everywhere */ 1354c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define fops_get(fops) \ 1355c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) 1356c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define fops_put(fops) \ 1357c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru do { if (fops) module_put((fops)->owner); } while(0) 1358c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1359c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_filesystem(struct file_system_type *); 1360c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int unregister_filesystem(struct file_system_type *); 1361c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct vfsmount *kern_mount(struct file_system_type *); 1362c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int may_umount_tree(struct vfsmount *); 1363c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int may_umount(struct vfsmount *); 1364c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void umount_tree(struct vfsmount *, int, struct list_head *); 1365c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void release_mounts(struct list_head *); 1366c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long do_mount(char *, char *, char *, unsigned long, void *); 1367c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int); 1368c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void mnt_set_mountpoint(struct vfsmount *, struct dentry *, 1369c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct vfsmount *); 1370c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1371c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_statfs(struct dentry *, struct kstatfs *); 1372c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1373c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* /sys/fs */ 1374c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct subsystem fs_subsys; 1375c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1376c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FLOCK_VERIFY_READ 1 1377c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FLOCK_VERIFY_WRITE 2 1378c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1379c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int locks_mandatory_locked(struct inode *); 1380c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); 1381c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1382c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1383c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Candidates for mandatory locking have the setgid bit set 1384c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * but no group execute bit - an otherwise meaningless combination. 1385c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1386c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MANDATORY_LOCK(inode) \ 1387c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) 1388c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1389c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int locks_verify_locked(struct inode *inode) 1390c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1391c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (MANDATORY_LOCK(inode)) 1392c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return locks_mandatory_locked(inode); 1393c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 1394c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1395c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1396c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int rw_verify_area(int, struct file *, loff_t *, size_t); 1397c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1398c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int locks_verify_truncate(struct inode *inode, 1399c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *filp, 1400c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t size) 1401c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1402c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (inode->i_flock && MANDATORY_LOCK(inode)) 1403c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return locks_mandatory_area( 1404c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru FLOCK_VERIFY_WRITE, inode, filp, 1405c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size < inode->i_size ? size : inode->i_size, 1406c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (size < inode->i_size ? inode->i_size - size 1407c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru : size - inode->i_size) 1408c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ); 1409c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 1410c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1411c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1412c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int break_lease(struct inode *inode, unsigned int mode) 1413c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1414c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (inode->i_flock) 1415c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __break_lease(inode, mode); 1416c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 1417c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1418c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1419c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/open.c */ 1420c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1421c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, 1422c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *filp); 1423c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long do_sys_open(int fdf, const char __user *filename, int flags, 1424c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int mode); 1425c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct file *filp_open(const char *, int, int); 1426c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct file * dentry_open(struct dentry *, struct vfsmount *, int); 1427c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filp_close(struct file *, fl_owner_t id); 1428c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern char * getname(const char __user *); 1429c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1430c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/dcache.c */ 1431c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init vfs_caches_init_early(void); 1432c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __init vfs_caches_init(unsigned long); 1433c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1434c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) 1435c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) 1436c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef CONFIG_AUDITSYSCALL 1437c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define putname(name) __putname(name) 1438c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 1439c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void putname(const char *name); 1440c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 1441c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1442c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_blkdev(unsigned int, const char *); 1443c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int unregister_blkdev(unsigned int, const char *); 1444c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *bdget(dev_t); 1445c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void bd_set_size(struct block_device *, loff_t size); 1446c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void bd_forget(struct inode *inode); 1447c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void bdput(struct block_device *); 1448c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *open_by_devnum(dev_t, unsigned); 1449c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *open_partition_by_devnum(dev_t, unsigned); 1450c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations def_blk_fops; 1451c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct address_space_operations def_blk_aops; 1452c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations def_chr_fops; 1453c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations bad_sock_fops; 1454c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations def_fifo_fops; 1455c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); 1456c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); 1457c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); 1458c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blkdev_get(struct block_device *, mode_t, unsigned); 1459c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blkdev_put(struct block_device *); 1460c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blkdev_put_partition(struct block_device *); 1461c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int bd_claim(struct block_device *, void *); 1462c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void bd_release(struct block_device *); 1463c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SYSFS 1464c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); 1465c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void bd_release_from_disk(struct block_device *, struct gendisk *); 1466c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 1467c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) 1468c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define bd_release_from_disk(bdev, disk) bd_release(bdev) 1469c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 1470c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1471c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/char_dev.c */ 1472c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define CHRDEV_MAJOR_HASH_SIZE 255 1473c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); 1474c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_chrdev_region(dev_t, unsigned, const char *); 1475c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_chrdev(unsigned int, const char *, 1476c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const struct file_operations *); 1477c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int unregister_chrdev(unsigned int, const char *); 1478c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void unregister_chrdev_region(dev_t, unsigned); 1479c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int chrdev_open(struct inode *, struct file *); 1480c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void chrdev_show(struct seq_file *,off_t); 1481c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1482c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/block_dev.c */ 1483c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKDEV_MAJOR_HASH_SIZE 255 1484c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1485c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const char *__bdevname(dev_t, char *buffer); 1486c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const char *bdevname(struct block_device *bdev, char *buffer); 1487c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *lookup_bdev(const char *); 1488c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct block_device *open_bdev_excl(const char *, int, void *); 1489c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void close_bdev_excl(struct block_device *); 1490c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blkdev_show(struct seq_file *,off_t); 1491c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1492c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void init_special_inode(struct inode *, umode_t, dev_t); 1493c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1494c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Invalid inode operations -- fs/bad_inode.c */ 1495c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void make_bad_inode(struct inode *); 1496c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int is_bad_inode(struct inode *); 1497c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1498c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations read_fifo_fops; 1499c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations write_fifo_fops; 1500c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations rdwr_fifo_fops; 1501c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1502c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int fs_may_remount_ro(struct super_block *); 1503c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1504c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1505c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * return READ, READA, or WRITE 1506c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1507c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) 1508c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1509c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1510c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * return data direction, READ or WRITE 1511c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1512c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define bio_data_dir(bio) ((bio)->bi_rw & 1) 1513c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1514c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int check_disk_change(struct block_device *); 1515c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int invalidate_inodes(struct super_block *); 1516c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __invalidate_device(struct block_device *); 1517c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int invalidate_partition(struct gendisk *, int); 1518c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruunsigned long invalidate_mapping_pages(struct address_space *mapping, 1519c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgoff_t start, pgoff_t end); 1520c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruunsigned long invalidate_inode_pages(struct address_space *mapping); 1521c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void invalidate_remote_inode(struct inode *inode) 1522c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1523c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 1524c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru S_ISLNK(inode->i_mode)) 1525c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru invalidate_inode_pages(inode->i_mapping); 1526c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1527c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int invalidate_inode_pages2(struct address_space *mapping); 1528c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int invalidate_inode_pages2_range(struct address_space *mapping, 1529c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgoff_t start, pgoff_t end); 1530c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int write_inode_now(struct inode *, int); 1531c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filemap_fdatawrite(struct address_space *); 1532c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filemap_flush(struct address_space *); 1533c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filemap_fdatawait(struct address_space *); 1534c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filemap_write_and_wait(struct address_space *mapping); 1535c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int filemap_write_and_wait_range(struct address_space *mapping, 1536c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t lstart, loff_t lend); 1537c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int wait_on_page_writeback_range(struct address_space *mapping, 1538c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgoff_t start, pgoff_t end); 1539c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __filemap_fdatawrite_range(struct address_space *mapping, 1540c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t start, loff_t end, int sync_mode); 1541c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1542c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long do_fsync(struct file *file, int datasync); 1543c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void sync_supers(void); 1544c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void sync_filesystems(int wait); 1545c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void emergency_sync(void); 1546c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void emergency_remount(void); 1547c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_remount_sb(struct super_block *sb, int flags, 1548c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *data, int force); 1549c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern sector_t bmap(struct inode *, sector_t); 1550c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int notify_change(struct dentry *, struct iattr *); 1551c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int permission(struct inode *, int, struct nameidata *); 1552c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int generic_permission(struct inode *, int, 1553c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*check_acl)(struct inode *, int)); 1554c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1555c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int get_write_access(struct inode *); 1556c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int deny_write_access(struct file *); 1557c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void put_write_access(struct inode * inode) 1558c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1559c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_dec(&inode->i_writecount); 1560c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1561c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void allow_write_access(struct file *file) 1562c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1563c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (file) 1564c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_inc(&file->f_dentry->d_inode->i_writecount); 1565c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1566c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int do_pipe(int *); 1567c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1568c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int open_namei(int dfd, const char *, int, int, struct nameidata *); 1569c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int may_open(struct nameidata *, int, int); 1570c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1571c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int kernel_read(struct file *, unsigned long, char *, unsigned long); 1572c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct file * open_exec(const char *); 1573c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1574c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/dcache.c -- generic fs support functions */ 1575c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int is_subdir(struct dentry *, struct dentry *); 1576c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ino_t find_inode_number(struct dentry *, struct qstr *); 1577c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1578c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/err.h> 1579c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1580c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* needed for stackable file system support */ 1581c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t default_llseek(struct file *file, loff_t offset, int origin); 1582c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1583c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); 1584c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1585c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void inode_init_once(struct inode *); 1586c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void iput(struct inode *); 1587c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode * igrab(struct inode *); 1588c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ino_t iunique(struct super_block *, ino_t); 1589c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int inode_needs_sync(struct inode *inode); 1590c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void generic_delete_inode(struct inode *inode); 1591c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void generic_drop_inode(struct inode *inode); 1592c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1593c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode *ilookup5_nowait(struct super_block *sb, 1594c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long hashval, int (*test)(struct inode *, void *), 1595c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *data); 1596c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, 1597c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*test)(struct inode *, void *), void *data); 1598c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode *ilookup(struct super_block *sb, unsigned long ino); 1599c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1600c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); 1601c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode * iget_locked(struct super_block *, unsigned long); 1602c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void unlock_new_inode(struct inode *); 1603c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1604c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline struct inode *iget(struct super_block *sb, unsigned long ino) 1605c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1606c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *inode = iget_locked(sb, ino); 1607c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1608c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (inode && (inode->i_state & I_NEW)) { 1609c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sb->s_op->read_inode(inode); 1610c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unlock_new_inode(inode); 1611c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } 1612c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1613c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return inode; 1614c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1615c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1616c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __iget(struct inode * inode); 1617c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void clear_inode(struct inode *); 1618c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void destroy_inode(struct inode *); 1619c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode *new_inode(struct super_block *); 1620c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int remove_suid(struct dentry *); 1621c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void remove_dquot_ref(struct super_block *, int, struct list_head *); 1622c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1623c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __insert_inode_hash(struct inode *, unsigned long hashval); 1624c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void remove_inode_hash(struct inode *); 1625c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void insert_inode_hash(struct inode *inode) { 1626c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __insert_inode_hash(inode, inode->i_ino); 1627c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1628c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1629c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct file * get_empty_filp(void); 1630c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void file_move(struct file *f, struct list_head *list); 1631c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void file_kill(struct file *f); 1632c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct bio; 1633c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void submit_bio(int, struct bio *); 1634c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int bdev_read_only(struct block_device *); 1635c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int set_blocksize(struct block_device *, int); 1636c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int sb_set_blocksize(struct super_block *, int); 1637c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int sb_min_blocksize(struct super_block *, int); 1638c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1639c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int generic_file_mmap(struct file *, struct vm_area_struct *); 1640c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); 1641c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); 1642c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); 1643c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); 1644c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); 1645c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); 1646c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); 1647c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); 1648c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); 1649c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, 1650c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long, loff_t *); 1651c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, 1652c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *, loff_t, loff_t *, size_t, size_t); 1653c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, 1654c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long, loff_t, loff_t *, size_t, ssize_t); 1655c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); 1656c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); 1657c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, 1658c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_segs, loff_t *ppos); 1659c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); 1660c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void do_generic_mapping_read(struct address_space *mapping, 1661c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file_ra_state *, struct file *, 1662c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t *, read_descriptor_t *, read_actor_t); 1663c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1664c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* fs/splice.c */ 1665c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_splice_read(struct file *, loff_t *, 1666c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct pipe_inode_info *, size_t, unsigned int); 1667c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_splice_write(struct pipe_inode_info *, 1668c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *, loff_t *, size_t, unsigned int); 1669c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, 1670c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *out, loff_t *, size_t len, unsigned int flags); 1671c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, 1672c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t len, unsigned int flags); 1673c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1674c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void 1675c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querufile_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); 1676c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, 1677c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_segs, loff_t *ppos); 1678c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t generic_file_writev(struct file *filp, const struct iovec *iov, 1679c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_segs, loff_t *ppos); 1680c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t no_llseek(struct file *file, loff_t offset, int origin); 1681c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); 1682c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t remote_llseek(struct file *file, loff_t offset, int origin); 1683c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int generic_file_open(struct inode * inode, struct file * filp); 1684c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int nonseekable_open(struct inode * inode, struct file * filp); 1685c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1686c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_FS_XIP 1687c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, 1688c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t *ppos); 1689c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, 1690c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t count, read_actor_t actor, 1691c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *target); 1692c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); 1693c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t xip_file_write(struct file *filp, const char __user *buf, 1694c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t len, loff_t *ppos); 1695c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int xip_truncate_page(struct address_space *mapping, loff_t from); 1696c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 1697c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int xip_truncate_page(struct address_space *mapping, loff_t from) 1698c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1699c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 1700c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1701c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 1702c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1703c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void do_generic_file_read(struct file * filp, loff_t *ppos, 1704c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru read_descriptor_t * desc, 1705c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru read_actor_t actor) 1706c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1707c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru do_generic_mapping_read(filp->f_mapping, 1708c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru &filp->f_ra, 1709c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru filp, 1710c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ppos, 1711c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru desc, 1712c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru actor); 1713c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1714c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1715c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 1716c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct block_device *bdev, const struct iovec *iov, loff_t offset, 1717c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, 1718c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int lock_type); 1719c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1720c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum { 1721c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru DIO_LOCKING = 1, /* need locking between buffered and direct access */ 1722c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ 1723c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ 1724c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1725c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1726c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, 1727c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *inode, struct block_device *bdev, const struct iovec *iov, 1728c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t offset, unsigned long nr_segs, get_block_t get_block, 1729c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dio_iodone_t end_io) 1730c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1731c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, 1732c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru nr_segs, get_block, end_io, DIO_LOCKING); 1733c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1734c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1735c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, 1736c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *inode, struct block_device *bdev, const struct iovec *iov, 1737c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t offset, unsigned long nr_segs, get_block_t get_block, 1738c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dio_iodone_t end_io) 1739c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1740c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, 1741c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru nr_segs, get_block, end_io, DIO_NO_LOCKING); 1742c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1743c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1744c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, 1745c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct inode *inode, struct block_device *bdev, const struct iovec *iov, 1746c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru loff_t offset, unsigned long nr_segs, get_block_t get_block, 1747c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru dio_iodone_t end_io) 1748c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1749c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, 1750c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru nr_segs, get_block, end_io, DIO_OWN_LOCKING); 1751c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1752c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1753c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations generic_ro_fops; 1754c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1755c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) 1756c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1757c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_readlink(struct dentry *, char __user *, int, const char *); 1758c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_follow_link(struct nameidata *, const char *); 1759c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int page_readlink(struct dentry *, char __user *, int); 1760c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void *page_follow_link_light(struct dentry *, struct nameidata *); 1761c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void page_put_link(struct dentry *, struct nameidata *, void *); 1762c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __page_symlink(struct inode *inode, const char *symname, int len, 1763c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru gfp_t gfp_mask); 1764c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int page_symlink(struct inode *inode, const char *symname, int len); 1765c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode_operations page_symlink_inode_operations; 1766c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int generic_readlink(struct dentry *, char __user *, int); 1767c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void generic_fillattr(struct inode *, struct kstat *); 1768c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 1769c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid inode_add_bytes(struct inode *inode, loff_t bytes); 1770c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid inode_sub_bytes(struct inode *inode, loff_t bytes); 1771c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruloff_t inode_get_bytes(struct inode *inode); 1772c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid inode_set_bytes(struct inode *inode, loff_t bytes); 1773c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1774c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_readdir(struct file *, filldir_t, void *); 1775c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1776c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_stat(char __user *, struct kstat *); 1777c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_lstat(char __user *, struct kstat *); 1778c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_stat_fd(int dfd, char __user *, struct kstat *); 1779c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); 1780c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_fstat(unsigned int, struct kstat *); 1781c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1782c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); 1783c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1784c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct file_system_type *get_fs_type(const char *name); 1785c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct super_block *get_super(struct block_device *); 1786c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct super_block *user_get_super(dev_t); 1787c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void drop_super(struct super_block *sb); 1788c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1789c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int dcache_dir_open(struct inode *, struct file *); 1790c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int dcache_dir_close(struct inode *, struct file *); 1791c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern loff_t dcache_dir_lseek(struct file *, loff_t, int); 1792c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int dcache_readdir(struct file *, void *, filldir_t); 1793c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); 1794c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_statfs(struct dentry *, struct kstatfs *); 1795c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_link(struct dentry *, struct inode *, struct dentry *); 1796c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_unlink(struct inode *, struct dentry *); 1797c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_rmdir(struct inode *, struct dentry *); 1798c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 1799c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_sync_file(struct file *, struct dentry *, int); 1800c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_empty(struct dentry *); 1801c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_readpage(struct file *file, struct page *page); 1802c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_prepare_write(struct file *file, struct page *page, 1803c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned offset, unsigned to); 1804c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_commit_write(struct file *file, struct page *page, 1805c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned offset, unsigned to); 1806c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1807c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); 1808c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); 1809c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern const struct file_operations simple_dir_operations; 1810c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct inode_operations simple_dir_inode_operations; 1811c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct tree_descr { char *name; const struct file_operations *ops; int mode; }; 1812c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct dentry *d_alloc_name(struct dentry *, const char *); 1813c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_fill_super(struct super_block *, int, struct tree_descr *); 1814c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); 1815c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void simple_release_fs(struct vfsmount **mount, int *count); 1816c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1817c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); 1818c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1819c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_MIGRATION 1820c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int buffer_migrate_page(struct address_space *, 1821c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct page *, struct page *); 1822c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 1823c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define buffer_migrate_page NULL 1824c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 1825c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1826c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int inode_change_ok(struct inode *, struct iattr *); 1827c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __must_check inode_setattr(struct inode *, struct iattr *); 1828c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1829c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void file_update_time(struct file *file); 1830c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1831c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline ino_t parent_ino(struct dentry *dentry) 1832c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1833c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ino_t res; 1834c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1835c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spin_lock(&dentry->d_lock); 1836c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru res = dentry->d_parent->d_inode->i_ino; 1837c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spin_unlock(&dentry->d_lock); 1838c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return res; 1839c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1840c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1841c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* kernel/fork.c */ 1842c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int unshare_files(void); 1843c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1844c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Transaction based IO helpers */ 1845c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1846c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1847c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * An argresp is stored in an allocated page and holds the 1848c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * size of the argument or response, along with its content 1849c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1850c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct simple_transaction_argresp { 1851c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ssize_t size; 1852c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char data[0]; 1853c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1854c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1855c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) 1856c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1857c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruchar *simple_transaction_get(struct file *file, const char __user *buf, 1858c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t size); 1859c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t simple_transaction_read(struct file *file, char __user *buf, 1860c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t size, loff_t *pos); 1861c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint simple_transaction_release(struct inode *inode, struct file *file); 1862c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1863c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void simple_transaction_set(struct file *file, size_t n) 1864c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1865c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct simple_transaction_argresp *ar = file->private_data; 1866c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1867c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); 1868c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1869c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 1870c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The barrier ensures that ar->size will really remain zero until 1871c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ar->data is ready for reading. 1872c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1873c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru smp_mb(); 1874c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ar->size = n; 1875c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1876c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1877c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 1878c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * simple attribute files 1879c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1880c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * These attributes behave similar to those in sysfs: 1881c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1882c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Writing to an attribute immediately sets a value, an open file can be 1883c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * written to multiple times. 1884c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1885c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Reading from an attribute creates a buffer from the value that might get 1886c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * read with multiple read calls. When the attribute has been read 1887c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * completely, no further read calls are possible until the file is opened 1888c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * again. 1889c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1890c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * All attributes contain a text representation of a numeric value 1891c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * that are accessed with the get() and set() functions. 1892c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 1893c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ 1894c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic int __fops ## _open(struct inode *inode, struct file *file) \ 1895c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ \ 1896c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __simple_attr_check_format(__fmt, 0ull); \ 1897c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return simple_attr_open(inode, file, __get, __set, __fmt); \ 1898c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} \ 1899c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic struct file_operations __fops = { \ 1900c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru .owner = THIS_MODULE, \ 1901c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru .open = __fops ## _open, \ 1902c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru .release = simple_attr_close, \ 1903c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru .read = simple_attr_read, \ 1904c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru .write = simple_attr_write, \ 1905c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 1906c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1907c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void __attribute__((format(printf, 1, 2))) 1908c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru__simple_attr_check_format(const char *fmt, ...) 1909c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1910c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* don't do anything, just let the compiler check the arguments; */ 1911c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1912c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1913c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint simple_attr_open(struct inode *inode, struct file *file, 1914c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru u64 (*get)(void *), void (*set)(void *, u64), 1915c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru const char *fmt); 1916c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint simple_attr_close(struct inode *inode, struct file *file); 1917c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t simple_attr_read(struct file *file, char __user *buf, 1918c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t len, loff_t *ppos); 1919c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querussize_t simple_attr_write(struct file *file, const char __user *buf, 1920c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size_t len, loff_t *ppos); 1921c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1922c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1923c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SECURITY 1924c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline char *alloc_secdata(void) 1925c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1926c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (char *)get_zeroed_page(GFP_KERNEL); 1927c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1928c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1929c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void free_secdata(void *secdata) 1930c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1931c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru free_page((unsigned long)secdata); 1932c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1933c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 1934c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline char *alloc_secdata(void) 1935c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 1936c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (char *)1; 1937c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 1938c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1939c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void free_secdata(void *secdata) 1940c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ } 1941c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* CONFIG_SECURITY */ 1942c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 1943c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* __KERNEL__ */ 1944c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* _LINUX_FS_H */ 1945