1/* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Robert Elz at The University of Melbourne. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * Version: $Id: quota.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $ 33 */ 34 35#ifndef _LINUX_QUOTA_ 36#define _LINUX_QUOTA_ 37 38#include <linux/errno.h> 39#include <linux/types.h> 40 41#define __DQUOT_VERSION__ "dquot_6.5.1" 42#define __DQUOT_NUM_VERSION__ 6*10000+5*100+1 43 44typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */ 45typedef __u64 qsize_t; /* Type in which we store sizes */ 46 47extern spinlock_t dq_data_lock; 48 49/* Size of blocks in which are counted size limits */ 50#define QUOTABLOCK_BITS 10 51#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) 52 53/* Conversion routines from and to quota blocks */ 54#define qb2kb(x) ((x) << (QUOTABLOCK_BITS-10)) 55#define kb2qb(x) ((x) >> (QUOTABLOCK_BITS-10)) 56#define toqb(x) (((x) + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS) 57 58#define MAXQUOTAS 2 59#define USRQUOTA 0 /* element used for user quotas */ 60#define GRPQUOTA 1 /* element used for group quotas */ 61 62/* 63 * Definitions for the default names of the quotas files. 64 */ 65#define INITQFNAMES { \ 66 "user", /* USRQUOTA */ \ 67 "group", /* GRPQUOTA */ \ 68 "undefined", \ 69}; 70 71/* 72 * Command definitions for the 'quotactl' system call. 73 * The commands are broken into a main command defined below 74 * and a subcommand that is used to convey the type of 75 * quota that is being manipulated (see above). 76 */ 77#define SUBCMDMASK 0x00ff 78#define SUBCMDSHIFT 8 79#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK)) 80 81#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */ 82#define Q_QUOTAON 0x800002 /* turn quotas on */ 83#define Q_QUOTAOFF 0x800003 /* turn quotas off */ 84#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */ 85#define Q_GETINFO 0x800005 /* get information about quota files */ 86#define Q_SETINFO 0x800006 /* set information about quota files */ 87#define Q_GETQUOTA 0x800007 /* get user quota structure */ 88#define Q_SETQUOTA 0x800008 /* set user quota structure */ 89 90/* 91 * Quota structure used for communication with userspace via quotactl 92 * Following flags are used to specify which fields are valid 93 */ 94#define QIF_BLIMITS 1 95#define QIF_SPACE 2 96#define QIF_ILIMITS 4 97#define QIF_INODES 8 98#define QIF_BTIME 16 99#define QIF_ITIME 32 100#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS) 101#define QIF_USAGE (QIF_SPACE | QIF_INODES) 102#define QIF_TIMES (QIF_BTIME | QIF_ITIME) 103#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES) 104 105struct if_dqblk { 106 __u64 dqb_bhardlimit; 107 __u64 dqb_bsoftlimit; 108 __u64 dqb_curspace; 109 __u64 dqb_ihardlimit; 110 __u64 dqb_isoftlimit; 111 __u64 dqb_curinodes; 112 __u64 dqb_btime; 113 __u64 dqb_itime; 114 __u32 dqb_valid; 115}; 116 117/* 118 * Structure used for setting quota information about file via quotactl 119 * Following flags are used to specify which fields are valid 120 */ 121#define IIF_BGRACE 1 122#define IIF_IGRACE 2 123#define IIF_FLAGS 4 124#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS) 125 126struct if_dqinfo { 127 __u64 dqi_bgrace; 128 __u64 dqi_igrace; 129 __u32 dqi_flags; 130 __u32 dqi_valid; 131}; 132 133#ifdef __KERNEL__ 134#include <linux/spinlock.h> 135#include <linux/mutex.h> 136 137#include <linux/dqblk_xfs.h> 138#include <linux/dqblk_v1.h> 139#include <linux/dqblk_v2.h> 140 141/* Maximal numbers of writes for quota operation (insert/delete/update) 142 * (over VFS all formats) */ 143#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC) 144#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE) 145#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC) 146#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE) 147 148/* 149 * Data for one user/group kept in memory 150 */ 151struct mem_dqblk { 152 __u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */ 153 __u32 dqb_bsoftlimit; /* preferred limit on disk blks */ 154 qsize_t dqb_curspace; /* current used space */ 155 __u32 dqb_ihardlimit; /* absolute limit on allocated inodes */ 156 __u32 dqb_isoftlimit; /* preferred inode limit */ 157 __u32 dqb_curinodes; /* current # allocated inodes */ 158 time_t dqb_btime; /* time limit for excessive disk use */ 159 time_t dqb_itime; /* time limit for excessive inode use */ 160}; 161 162/* 163 * Data for one quotafile kept in memory 164 */ 165struct quota_format_type; 166 167struct mem_dqinfo { 168 struct quota_format_type *dqi_format; 169 struct list_head dqi_dirty_list; /* List of dirty dquots */ 170 unsigned long dqi_flags; 171 unsigned int dqi_bgrace; 172 unsigned int dqi_igrace; 173 union { 174 struct v1_mem_dqinfo v1_i; 175 struct v2_mem_dqinfo v2_i; 176 } u; 177}; 178 179struct super_block; 180 181#define DQF_MASK 0xffff /* Mask for format specific flags */ 182#define DQF_INFO_DIRTY_B 16 183#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */ 184 185extern void mark_info_dirty(struct super_block *sb, int type); 186#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags) 187#define info_any_dquot_dirty(info) (!list_empty(&(info)->dqi_dirty_list)) 188#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info)) 189 190#define sb_dqopt(sb) (&(sb)->s_dquot) 191#define sb_dqinfo(sb, type) (sb_dqopt(sb)->info+(type)) 192 193struct dqstats { 194 int lookups; 195 int drops; 196 int reads; 197 int writes; 198 int cache_hits; 199 int allocated_dquots; 200 int free_dquots; 201 int syncs; 202}; 203 204extern struct dqstats dqstats; 205 206#define DQ_MOD_B 0 /* dquot modified since read */ 207#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */ 208#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */ 209#define DQ_FAKE_B 3 /* no limits only usage */ 210#define DQ_READ_B 4 /* dquot was read into memory */ 211#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */ 212 213struct dquot { 214 struct hlist_node dq_hash; /* Hash list in memory */ 215 struct list_head dq_inuse; /* List of all quotas */ 216 struct list_head dq_free; /* Free list element */ 217 struct list_head dq_dirty; /* List of dirty dquots */ 218 struct mutex dq_lock; /* dquot IO lock */ 219 atomic_t dq_count; /* Use count */ 220 wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */ 221 struct super_block *dq_sb; /* superblock this applies to */ 222 unsigned int dq_id; /* ID this applies to (uid, gid) */ 223 loff_t dq_off; /* Offset of dquot on disk */ 224 unsigned long dq_flags; /* See DQ_* */ 225 short dq_type; /* Type of quota */ 226 struct mem_dqblk dq_dqb; /* Diskquota usage */ 227}; 228 229#define NODQUOT (struct dquot *)NULL 230 231#define QUOTA_OK 0 232#define NO_QUOTA 1 233 234/* Operations which must be implemented by each quota format */ 235struct quota_format_ops { 236 int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ 237 int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ 238 int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ 239 int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ 240 int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ 241 int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ 242 int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ 243}; 244 245/* Operations working with dquots */ 246struct dquot_operations { 247 int (*initialize) (struct inode *, int); 248 int (*drop) (struct inode *); 249 int (*alloc_space) (struct inode *, qsize_t, int); 250 int (*alloc_inode) (const struct inode *, unsigned long); 251 int (*free_space) (struct inode *, qsize_t); 252 int (*free_inode) (const struct inode *, unsigned long); 253 int (*transfer) (struct inode *, struct iattr *); 254 int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ 255 int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ 256 int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ 257 int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ 258 int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ 259}; 260 261/* Operations handling requests from userspace */ 262struct quotactl_ops { 263 int (*quota_on)(struct super_block *, int, int, char *); 264 int (*quota_off)(struct super_block *, int); 265 int (*quota_sync)(struct super_block *, int); 266 int (*get_info)(struct super_block *, int, struct if_dqinfo *); 267 int (*set_info)(struct super_block *, int, struct if_dqinfo *); 268 int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *); 269 int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *); 270 int (*get_xstate)(struct super_block *, struct fs_quota_stat *); 271 int (*set_xstate)(struct super_block *, unsigned int, int); 272 int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *); 273 int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *); 274}; 275 276struct quota_format_type { 277 int qf_fmt_id; /* Quota format id */ 278 struct quota_format_ops *qf_ops; /* Operations of format */ 279 struct module *qf_owner; /* Module implementing quota format */ 280 struct quota_format_type *qf_next; 281}; 282 283#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */ 284#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */ 285 286struct quota_info { 287 unsigned int flags; /* Flags for diskquotas on this device */ 288 struct mutex dqio_mutex; /* lock device while I/O in progress */ 289 struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */ 290 struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */ 291 struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ 292 struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ 293 struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ 294}; 295 296/* Inline would be better but we need to dereference super_block which is not defined yet */ 297int mark_dquot_dirty(struct dquot *dquot); 298 299#define dquot_dirty(dquot) test_bit(DQ_MOD_B, &(dquot)->dq_flags) 300 301#define sb_has_quota_enabled(sb, type) ((type)==USRQUOTA ? \ 302 (sb_dqopt(sb)->flags & DQUOT_USR_ENABLED) : (sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED)) 303 304#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \ 305 sb_has_quota_enabled(sb, GRPQUOTA)) 306 307int register_quota_format(struct quota_format_type *fmt); 308void unregister_quota_format(struct quota_format_type *fmt); 309 310struct quota_module_name { 311 int qm_fmt_id; 312 char *qm_mod_name; 313}; 314 315#define INIT_QUOTA_MODULE_NAMES {\ 316 {QFMT_VFS_OLD, "quota_v1"},\ 317 {QFMT_VFS_V0, "quota_v2"},\ 318 {0, NULL}} 319 320#else 321 322# /* nodep */ include <sys/cdefs.h> 323 324__BEGIN_DECLS 325long quotactl __P ((unsigned int, const char *, int, caddr_t)); 326__END_DECLS 327 328#endif /* __KERNEL__ */ 329#endif /* _QUOTA_ */ 330