mkjournal.c revision 543547a52a20cb7e69d74921b2f691078fd55d83
1d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o/* 2d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o * mkjournal.c --- make a journal for a filesystem 3d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o * 4d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o * Copyright (C) 2000 Theodore Ts'o. 5efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o * 6d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o * %Begin-Header% 7543547a52a20cb7e69d74921b2f691078fd55d83Theodore Ts'o * This file may be redistributed under the terms of the GNU Library 8543547a52a20cb7e69d74921b2f691078fd55d83Theodore Ts'o * General Public License, version 2. 9d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o * %End-Header% 10d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o */ 11d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 12d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <stdio.h> 13d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <string.h> 14d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#if HAVE_UNISTD_H 15d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <unistd.h> 16d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#endif 17d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#if HAVE_ERRNO_H 18d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <errno.h> 19d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#endif 20d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <fcntl.h> 21d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <time.h> 22d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#if HAVE_SYS_STAT_H 23d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <sys/stat.h> 24d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#endif 25d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#if HAVE_SYS_TYPES_H 26d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include <sys/types.h> 27d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#endif 28349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#if HAVE_SYS_IOCTL_H 29349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#include <sys/ioctl.h> 30349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#endif 3117ee8b17f91988a3beedbd96eec4642e784f3251Theodore Ts'o#if HAVE_NETINET_IN_H 3217ee8b17f91988a3beedbd96eec4642e784f3251Theodore Ts'o#include <netinet/in.h> 3317ee8b17f91988a3beedbd96eec4642e784f3251Theodore Ts'o#endif 34d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 35d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include "ext2_fs.h" 36cdaf1fa78f6d63457eb5337c14b23e567d1346a7Theodore Ts'o#include "e2p/e2p.h" 37d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#include "ext2fs.h" 38586187372afea65ae685687505b49b40fc5f3212Theodore Ts'o#include "jfs_user.h" 39d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 40a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o/* 41a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o * This function automatically sets up the journal superblock and 42a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o * returns it as an allocated block. 43a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o */ 44a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'oerrcode_t ext2fs_create_journal_superblock(ext2_filsys fs, 45a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o __u32 size, int flags, 46a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o char **ret_jsb) 47d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o{ 48a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o errcode_t retval; 49a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o journal_superblock_t *jsb; 50036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o 51036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o if (size < 1024) 52036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o return EXT2_ET_JOURNAL_TOO_SMALL; 53036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o 54c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4eTheodore Ts'o if ((retval = ext2fs_get_mem(fs->blocksize, &jsb))) 55a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return retval; 56a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o 57a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o memset (jsb, 0, fs->blocksize); 58586187372afea65ae685687505b49b40fc5f3212Theodore Ts'o 59d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); 604e246704eab31407ac15be9ab206c6f929507cf0Theodore Ts'o if (flags & EXT2_MKJOURNAL_V1_SUPER) 614e246704eab31407ac15be9ab206c6f929507cf0Theodore Ts'o jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1); 624e246704eab31407ac15be9ab206c6f929507cf0Theodore Ts'o else 634e246704eab31407ac15be9ab206c6f929507cf0Theodore Ts'o jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); 64a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o jsb->s_blocksize = htonl(fs->blocksize); 65d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o jsb->s_maxlen = htonl(size); 66d23042af75f2723ed4575946cfa310fca4e526efTheodore Ts'o jsb->s_nr_users = htonl(1); 67d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o jsb->s_first = htonl(1); 68d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o jsb->s_sequence = htonl(1); 69a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid)); 70a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o /* 71d23042af75f2723ed4575946cfa310fca4e526efTheodore Ts'o * If we're creating an external journal device, we need to 72d23042af75f2723ed4575946cfa310fca4e526efTheodore Ts'o * adjust these fields. 73a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o */ 74a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if (fs->super->s_feature_incompat & 754e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { 76a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o jsb->s_nr_users = 0; 774e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o if (fs->blocksize == 1024) 784e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o jsb->s_first = htonl(3); 794e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o else 804e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o jsb->s_first = htonl(2); 814e40f6c348b9c9f4bd9c82c2b5404c2eabbdc1d3Theodore Ts'o } 82a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o 83a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o *ret_jsb = (char *) jsb; 84a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return 0; 85d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o} 864becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 87d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o/* 884becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * This function writes a journal using POSIX routines. It is used 894becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * for creating external journals and creating journals on live 904becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * filesystems. 91d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o */ 92a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'ostatic errcode_t write_journal_file(ext2_filsys fs, char *filename, 934e246704eab31407ac15be9ab206c6f929507cf0Theodore Ts'o blk_t size, int flags) 94d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o{ 95d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o errcode_t retval; 96d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o char *buf = 0; 97544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o int fd, ret_size; 98544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o blk_t i; 99d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 100a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf))) 101a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return retval; 102d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 103a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o /* Open the device or journal file */ 104a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if ((fd = open(filename, O_WRONLY)) < 0) { 105d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o retval = errno; 106d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o goto errout; 107d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 108d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 109d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o /* Write the superblock out */ 110d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o retval = EXT2_ET_SHORT_WRITE; 111d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o ret_size = write(fd, buf, fs->blocksize); 112d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (ret_size < 0) { 113a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o retval = errno; 114d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o goto errout; 115d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 116544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o if (ret_size != (int) fs->blocksize) 117d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o goto errout; 118d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o memset(buf, 0, fs->blocksize); 1194becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 1204becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o for (i = 1; i < size; i++) { 121d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o ret_size = write(fd, buf, fs->blocksize); 122d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (ret_size < 0) { 123d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o retval = errno; 124d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o goto errout; 125d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 126544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o if (ret_size != (int) fs->blocksize) 127d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o goto errout; 128d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 129d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o close(fd); 130d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 1314becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o retval = 0; 132d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'oerrout: 133c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4eTheodore Ts'o ext2fs_free_mem(&buf); 134d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return retval; 135d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o} 136d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 137d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o/* 138c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * Convenience function which zeros out _num_ blocks starting at 139c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * _blk_. In case of an error, the details of the error is returned 140c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * via _ret_blk_ and _ret_count_ if they are non-NULL pointers. 141c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * Returns 0 on success, and an error code on an error. 142c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * 143c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * As a special case, if the first argument is NULL, then it will 144c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * attempt to free the static zeroizing buffer. (This is to keep 145c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o * programs that check for memory leaks happy.) 146c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o */ 147c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o#define STRIDE_LENGTH 8 148c86085044195c8b721fe9ee327d790316399781eTheodore Ts'oerrcode_t ext2fs_zero_blocks(ext2_filsys fs, blk_t blk, int num, 149c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o blk_t *ret_blk, int *ret_count) 150c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o{ 151c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o int j, count; 152c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o static char *buf; 153c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o errcode_t retval; 154c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o 155c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o /* If fs is null, clean up the static buffer and return */ 156c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (!fs) { 157c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (buf) { 158c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o free(buf); 159c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o buf = 0; 160c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 161c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o return 0; 162c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 163c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o /* Allocate the zeroizing buffer if necessary */ 164c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (!buf) { 165c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o buf = malloc(fs->blocksize * STRIDE_LENGTH); 166c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (!buf) 167c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o return ENOMEM; 168c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o memset(buf, 0, fs->blocksize * STRIDE_LENGTH); 169c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 170c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o /* OK, do the write loop */ 171c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o j=0; 172c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o while (j < num) { 173bc507e31ad8a890232dc2b3aec9ee9d68e95622aTheodore Ts'o if (blk % STRIDE_LENGTH) { 174c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o count = STRIDE_LENGTH - (blk % STRIDE_LENGTH); 175bc507e31ad8a890232dc2b3aec9ee9d68e95622aTheodore Ts'o if (count > (num - j)) 176bc507e31ad8a890232dc2b3aec9ee9d68e95622aTheodore Ts'o count = num - j; 177bc507e31ad8a890232dc2b3aec9ee9d68e95622aTheodore Ts'o } else { 178c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o count = num - j; 179c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (count > STRIDE_LENGTH) 180c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o count = STRIDE_LENGTH; 181c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 182c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o retval = io_channel_write_blk(fs->io, blk, count, buf); 183c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (retval) { 184c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (ret_count) 185c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o *ret_count = count; 186c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (ret_blk) 187c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o *ret_blk = blk; 188c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o return retval; 189c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 190c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o j += count; blk += count; 191c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 192c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o return 0; 193c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o} 194c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o 195c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o/* 1964becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * Helper function for creating the journal using direct I/O routines 197d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o */ 198d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'ostruct mkjournal_struct { 199d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o int num_blocks; 200d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o int newblocks; 2011af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o blk_t goal; 202c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o blk_t blk_to_zero; 203c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o int zero_count; 204d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o char *buf; 205d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o errcode_t err; 206d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o}; 207d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 208544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'ostatic int mkjournal_proc(ext2_filsys fs, 209544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o blk_t *blocknr, 210544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o e2_blkcnt_t blockcnt, 211544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o blk_t ref_block EXT2FS_ATTR((unused)), 212544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o int ref_offset EXT2FS_ATTR((unused)), 213544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o void *priv_data) 214d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o{ 215d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data; 216d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o blk_t new_blk; 217d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o errcode_t retval; 218efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 219d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (*blocknr) { 2201af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o es->goal = *blocknr; 221d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return 0; 222d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 2231af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o retval = ext2fs_new_block(fs, es->goal, 0, &new_blk); 224d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (retval) { 225d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es->err = retval; 226d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return BLOCK_ABORT; 227d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 228674c0cc4cb137c6362cb1ae71b6db5cbccbad83aTheodore Ts'o if (blockcnt >= 0) 229d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es->num_blocks--; 230d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 231d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es->newblocks++; 232c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o retval = 0; 233c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (blockcnt <= 0) 234c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf); 235c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o else { 236c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (es->zero_count) { 237c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if ((es->blk_to_zero + es->zero_count == new_blk) && 238c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o (es->zero_count < 1024)) 239c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->zero_count++; 240c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o else { 241c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o retval = ext2fs_zero_blocks(fs, 242c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->blk_to_zero, 243c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->zero_count, 244c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o 0, 0); 245c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->zero_count = 0; 246c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 247c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 248c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (es->zero_count == 0) { 249c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->blk_to_zero = new_blk; 250c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es->zero_count = 1; 251c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 252c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 253d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 254d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (blockcnt == 0) 255d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o memset(es->buf, 0, fs->blocksize); 256d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 257d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (retval) { 258d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es->err = retval; 259d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return BLOCK_ABORT; 260d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 2611af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o *blocknr = es->goal = new_blk; 2628bd0c95908baa3af706b9e731daff9472bec74c9Theodore Ts'o ext2fs_block_alloc_stats(fs, new_blk, +1); 263d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 264d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (es->num_blocks == 0) 265d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return (BLOCK_CHANGED | BLOCK_ABORT); 266d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o else 267d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return BLOCK_CHANGED; 268efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 269d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o} 270d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 271d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o/* 2724becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * This function creates a journal using direct I/O routines. 273d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o */ 27431dbecd482405e0d3a67eb58e1a1c8cb9f2ad83eTheodore Ts'ostatic errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino, 2754becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o blk_t size, int flags) 276d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o{ 277a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o char *buf; 278b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o dgrp_t group, start, end, i, log_flex; 279d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o errcode_t retval; 280d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o struct ext2_inode inode; 281d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o struct mkjournal_struct es; 282d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 283a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf))) 284a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return retval; 285efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 286d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if ((retval = ext2fs_read_bitmaps(fs))) 287d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return retval; 288d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 2894becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if ((retval = ext2fs_read_inode(fs, journal_ino, &inode))) 290d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return retval; 291d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 292d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (inode.i_blocks > 0) 293d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return EEXIST; 294d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 295d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es.num_blocks = size; 296d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es.newblocks = 0; 297d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es.buf = buf; 298d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o es.err = 0; 299c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es.zero_count = 0; 300d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 301961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) { 302961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o inode.i_flags |= EXT4_EXTENTS_FL; 303961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o if ((retval = ext2fs_write_inode(fs, journal_ino, &inode))) 304961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o return retval; 305961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o } 306961306d31ad36a9eef4e515343c9e355afc6e19cTheodore Ts'o 3071af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o /* 3081af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o * Set the initial goal block to be roughly at the middle of 3091af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o * the filesystem. Pick a group that has the largest number 3101af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o * of free blocks. 3111af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o */ 312efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o group = ext2fs_group_of_blk(fs, (fs->super->s_blocks_count - 3131af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o fs->super->s_first_data_block) / 2); 314b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o log_flex = 1 << fs->super->s_log_groups_per_flex; 315b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o if (fs->super->s_log_groups_per_flex && (group > log_flex)) { 316b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o group = group & ~(log_flex - 1); 317b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o while ((group < fs->group_desc_count) && 318b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o fs->group_desc[group].bg_free_blocks_count == 0) 319b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o group++; 320b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o if (group == fs->group_desc_count) 321b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o group = 0; 322b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o start = group; 323b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o } else 324b55d73985cc7a33e2b57161e5ea1a5a2ad1bff9cTheodore Ts'o start = (group > 0) ? group-1 : group; 3251af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o end = ((group+1) < fs->group_desc_count) ? group+1 : group; 3261af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o group = start; 3271af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o for (i=start+1; i <= end; i++) 3281af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o if (fs->group_desc[i].bg_free_blocks_count > 3291af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o fs->group_desc[group].bg_free_blocks_count) 3301af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o group = i; 3311af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o 3321af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o es.goal = (fs->super->s_blocks_per_group * group) + 3331af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o fs->super->s_first_data_block; 3341af01e94cc020ab989cc97cec1b755bf2a476508Theodore Ts'o 3354becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND, 336d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 0, mkjournal_proc, &es); 337a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if (es.err) { 338a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o retval = es.err; 339a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o goto errout; 340a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o } 341c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (es.zero_count) { 342c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o retval = ext2fs_zero_blocks(fs, es.blk_to_zero, 343c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o es.zero_count, 0, 0); 344c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o if (retval) 345c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o goto errout; 346c86085044195c8b721fe9ee327d790316399781eTheodore Ts'o } 347d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 3484becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if ((retval = ext2fs_read_inode(fs, journal_ino, &inode))) 349a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o goto errout; 350d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 351d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o inode.i_size += fs->blocksize * size; 3521ca1059fd0126fd2c065f272a566c18f14bab16dTheodore Ts'o ext2fs_iblk_add_blocks(fs, &inode, es.newblocks); 35332138187f08d1f1dc03feb269f987982db76f3dbTheodore Ts'o inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0); 354d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o inode.i_links_count = 1; 355d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o inode.i_mode = LINUX_S_IFREG | 0600; 356d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 357827c1887118eb68a64f8455d0b7cbbbed65e714aEric Sandeen if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode))) 358a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o goto errout; 359a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o retval = 0; 360d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 361a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4); 362a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o fs->super->s_jnl_blocks[16] = inode.i_size; 363a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; 364a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o ext2fs_mark_super_dirty(fs); 365a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o 366a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'oerrout: 367c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4eTheodore Ts'o ext2fs_free_mem(&buf); 368a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return retval; 3694becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o} 3704becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 3714becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o/* 37256d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o * Find a reasonable journal file size (in blocks) given the number of blocks 37356d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o * in the filesystem. For very small filesystems, it is not reasonable to 37456d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o * have a journal that fills more than half of the filesystem. 37556d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o */ 37656d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'oint ext2fs_default_journal_size(__u64 blocks) 37756d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o{ 37856d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o if (blocks < 2048) 37956d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return -1; 38056d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o if (blocks < 32768) 38156d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return (1024); 38256d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o if (blocks < 256*1024) 38356d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return (4096); 38456d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o if (blocks < 512*1024) 38556d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return (8192); 38656d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o if (blocks < 1024*1024) 38756d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return (16384); 38856d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o return 32768; 38956d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o} 39056d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o 39156d1236726d8e4624d2f3a2f4713864c1e66bb40Theodore Ts'o/* 3924becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * This function adds a journal device to a filesystem 3934becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o */ 394a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'oerrcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev) 3954becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o{ 3964becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o struct stat st; 3974becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o errcode_t retval; 398a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o char buf[1024]; 399a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o journal_superblock_t *jsb; 400544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o int start; 401544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o __u32 i, nr_users; 4024becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 4034becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o /* Make sure the device exists and is a block device */ 404020888625fb8f6d5293e67da95ae18c0af45aeadTheodore Ts'o if (stat(journal_dev->device_name, &st) < 0) 4054becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return errno; 406efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 4074becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if (!S_ISBLK(st.st_mode)) 408036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */ 4094becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 410a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o /* Get the journal superblock */ 41136131b37d7d37ad59153cc2c56f774e28e286acfTheodore Ts'o start = 1; 41236131b37d7d37ad59153cc2c56f774e28e286acfTheodore Ts'o if (journal_dev->blocksize == 1024) 41336131b37d7d37ad59153cc2c56f774e28e286acfTheodore Ts'o start++; 41436131b37d7d37ad59153cc2c56f774e28e286acfTheodore Ts'o if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf))) 4154becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return retval; 4164becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 417a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o jsb = (journal_superblock_t *) buf; 418a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) || 419a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) 420036039460ff76f397bc23977a26632698136b0e6Theodore Ts'o return EXT2_ET_NO_JOURNAL_SB; 421a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o 422544349270e4c74a6feb971123884a8cf5052a7eeTheodore Ts'o if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize) 423a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o return EXT2_ET_UNEXPECTED_BLOCK_SIZE; 424a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o 425a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o /* Check and see if this filesystem has already been added */ 426a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o nr_users = ntohl(jsb->s_nr_users); 427a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o for (i=0; i < nr_users; i++) { 428a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if (memcmp(fs->super->s_uuid, 429a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o &jsb->s_users[i*16], 16) == 0) 430a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o break; 431a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o } 432a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o if (i >= nr_users) { 433a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o memcpy(&jsb->s_users[nr_users*16], 434a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o fs->super->s_uuid, 16); 435a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o jsb->s_nr_users = htonl(nr_users+1); 436a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o } 4374becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 438a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o /* Writeback the journal superblock */ 439f35e6440ef09dca989d98213c1be62efd1ee183aTheodore Ts'o if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf))) 4404becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return retval; 441efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 4424becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o fs->super->s_journal_inum = 0; 4434becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o fs->super->s_journal_dev = st.st_rdev; 444a112847b39386f9e7332ba5e5a0a5e54cfe301ccTheodore Ts'o memcpy(fs->super->s_journal_uuid, jsb->s_uuid, 4454becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o sizeof(fs->super->s_journal_uuid)); 4464becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 4474becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o ext2fs_mark_super_dirty(fs); 448cdaf1fa78f6d63457eb5337c14b23e567d1346a7Theodore Ts'o return 0; 4494becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o} 4504becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 4514becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o/* 4524becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * This function adds a journal inode to a filesystem, using either 4534becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * POSIX routines if the filesystem is mounted, or using direct I/O 4544becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o * functions if it is not. 4554becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o */ 4564becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'oerrcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags) 4574becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o{ 4584becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o errcode_t retval; 45931dbecd482405e0d3a67eb58e1a1c8cb9f2ad83eTheodore Ts'o ext2_ino_t journal_ino; 4604becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o struct stat st; 4614becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o char jfile[1024]; 4629b9a780f5a5823865f62f0c9fd194d262f63a06fTheodore Ts'o int mount_flags, f; 4639b9a780f5a5823865f62f0c9fd194d262f63a06fTheodore Ts'o int fd = -1; 4644becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 465cdaf1fa78f6d63457eb5337c14b23e567d1346a7Theodore Ts'o if ((retval = ext2fs_check_mount_point(fs->device_name, &mount_flags, 466cdaf1fa78f6d63457eb5337c14b23e567d1346a7Theodore Ts'o jfile, sizeof(jfile)-10))) 4674becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return retval; 4684becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 4694becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if (mount_flags & EXT2_MF_MOUNTED) { 4704becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o strcat(jfile, "/.journal"); 4714becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 4725bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o /* 473efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o * If .../.journal already exists, make sure any 4745bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o * immutable or append-only flags are cleared. 4755bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o */ 4765bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP) 4775bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o (void) chflags (jfile, 0); 4785bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o#else 4795bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o#if HAVE_EXT2_IOCTLS 4805bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o fd = open(jfile, O_RDONLY); 4815bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o if (fd >= 0) { 4825bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o f = 0; 4835bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o ioctl(fd, EXT2_IOC_SETFLAGS, &f); 4845bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o close(fd); 4855bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o } 4865bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o#endif 4875bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o#endif 4885bc28df0fa2544a08b65d9091fdc9fb23bdbce68Theodore Ts'o 4894becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o /* Create the journal file */ 4904becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0) 4914becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return errno; 4924becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 4934becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if ((retval = write_journal_file(fs, jfile, size, flags))) 494b23520d0501095dee715d0829c365933c216e612Theodore Ts'o goto errout; 495efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 4964becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o /* Get inode number of the journal file */ 4978bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o if (fstat(fd, &st) < 0) { 4988bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o retval = errno; 499b23520d0501095dee715d0829c365933c216e612Theodore Ts'o goto errout; 5008bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o } 5014becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o 5027833262585b0f9f85915c387fa35708cf3ff3609Theodore Ts'o#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP) 503349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE); 504349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#else 505349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#if HAVE_EXT2_IOCTLS 5068bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o if (ioctl(fd, EXT2_IOC_GETFLAGS, &f) < 0) { 5078bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o retval = errno; 5088bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o goto errout; 5098bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o } 5108bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o f |= EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL; 511349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f); 512349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#endif 513349a484a57ab13fed315f72552bdf8dbf89ba72aTheodore Ts'o#endif 5148bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o if (retval) { 5158bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o retval = errno; 516b23520d0501095dee715d0829c365933c216e612Theodore Ts'o goto errout; 5178bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o } 518efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 5198bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o if (close(fd) < 0) { 5208bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o retval = errno; 5218bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o fd = -1; 5228bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o goto errout; 5238bafedbf4a6889b20e119a667fc243909d283f85Theodore Ts'o } 5244becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o journal_ino = st.st_ino; 5254becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o } else { 526cef2ac104d45c351344cd10ac1419ad5f6422d8bTheodore Ts'o if ((mount_flags & EXT2_MF_BUSY) && 527cef2ac104d45c351344cd10ac1419ad5f6422d8bTheodore Ts'o !(fs->flags & EXT2_FLAG_EXCLUSIVE)) { 52829af314d3fd4cb907a4f474645e04bd26ba66f5fTheodore Ts'o retval = EBUSY; 52929af314d3fd4cb907a4f474645e04bd26ba66f5fTheodore Ts'o goto errout; 53029af314d3fd4cb907a4f474645e04bd26ba66f5fTheodore Ts'o } 5314becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o journal_ino = EXT2_JOURNAL_INO; 5324becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o if ((retval = write_journal_inode(fs, journal_ino, 5334becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o size, flags))) 5344becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o return retval; 5354becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o } 536efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 5374becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o fs->super->s_journal_inum = journal_ino; 5384becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o fs->super->s_journal_dev = 0; 5394becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o memset(fs->super->s_journal_uuid, 0, 5404becab6824aa5fdb022a293ae0b4622784496256Theodore Ts'o sizeof(fs->super->s_journal_uuid)); 541d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 542d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 543d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o ext2fs_mark_super_dirty(fs); 544d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o return 0; 545b23520d0501095dee715d0829c365933c216e612Theodore Ts'oerrout: 5469b9a780f5a5823865f62f0c9fd194d262f63a06fTheodore Ts'o if (fd > 0) 5479b9a780f5a5823865f62f0c9fd194d262f63a06fTheodore Ts'o close(fd); 548b23520d0501095dee715d0829c365933c216e612Theodore Ts'o return retval; 549d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o} 550d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 551d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#ifdef DEBUG 552d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'omain(int argc, char **argv) 553d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o{ 554d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o errcode_t retval; 555d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o char *device_name; 556d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o ext2_filsys fs; 557d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 558d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (argc < 2) { 559d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o fprintf(stderr, "Usage: %s filesystem\n", argv[0]); 560d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o exit(1); 561d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 562d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o device_name = argv[1]; 563efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 564d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0, 565d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o unix_io_manager, &fs); 566d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (retval) { 567d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o com_err(argv[0], retval, "while opening %s", device_name); 568d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o exit(1); 569d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 570d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o 57131a17b36d5f7d875f9de8e86501eaf2338f94d2bTheodore Ts'o retval = ext2fs_add_journal_inode(fs, 1024); 572d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (retval) { 573d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o com_err(argv[0], retval, "while adding journal to %s", 574d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o device_name); 575d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o exit(1); 576d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 577d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o retval = ext2fs_flush(fs); 578d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o if (retval) { 579d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o printf("Warning, had trouble writing out superblocks.\n"); 580d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o } 581d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o ext2fs_close(fs); 582d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o exit(0); 583efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o 584d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o} 585d3cd93cabeac8c153c8ae7b1b7358d6ced86b15eTheodore Ts'o#endif 586