include/linux/quota.h

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