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
  33 #ifndef _LINUX_QUOTA_
  34 #define _LINUX_QUOTA_
  35
  36 #include <linux/errno.h>
  37 #include <linux/types.h>
  38
  39 #define __DQUOT_VERSION__       "dquot_6.5.2"
  40
  41 #define MAXQUOTAS 2
  42 #define USRQUOTA  0             /* element used for user quotas */
  43 #define GRPQUOTA  1             /* element used for group quotas */
  44
  45 /*
  46  * Definitions for the default names of the quotas files.
  47  */
  48 #define INITQFNAMES { \
  49         "user",    /* USRQUOTA */ \
  50         "group",   /* GRPQUOTA */ \
  51         "undefined", \
  52 };
  53
  54 /*
  55  * Command definitions for the 'quotactl' system call.
  56  * The commands are broken into a main command defined below
  57  * and a subcommand that is used to convey the type of
  58  * quota that is being manipulated (see above).
  59  */
  60 #define SUBCMDMASK  0x00ff
  61 #define SUBCMDSHIFT 8
  62 #define QCMD(cmd, type)  (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
  63
  64 #define Q_SYNC     0x800001     /* sync disk copy of a filesystems quotas */
  65 #define Q_QUOTAON  0x800002     /* turn quotas on */
  66 #define Q_QUOTAOFF 0x800003     /* turn quotas off */
  67 #define Q_GETFMT   0x800004     /* get quota format used on given filesystem */
  68 #define Q_GETINFO  0x800005     /* get information about quota files */
  69 #define Q_SETINFO  0x800006     /* set information about quota files */
  70 #define Q_GETQUOTA 0x800007     /* get user quota structure */
  71 #define Q_SETQUOTA 0x800008     /* set user quota structure */
  72
  73 /* Quota format type IDs */
  74 #define QFMT_VFS_OLD 1
  75 #define QFMT_VFS_V0 2
  76
  77 /* Size of block in which space limits are passed through the quota
  78  * interface */
  79 #define QIF_DQBLKSIZE_BITS 10
  80 #define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
  81
  82 /*
  83  * Quota structure used for communication with userspace via quotactl
  84  * Following flags are used to specify which fields are valid
  85  */
  86 enum {
  87         QIF_BLIMITS_B = 0,
  88         QIF_SPACE_B,
  89         QIF_ILIMITS_B,
  90         QIF_INODES_B,
  91         QIF_BTIME_B,
  92         QIF_ITIME_B,
  93 };
  94
  95 #define QIF_BLIMITS     (1 << QIF_BLIMITS_B)
  96 #define QIF_SPACE       (1 << QIF_SPACE_B)
  97 #define QIF_ILIMITS     (1 << QIF_ILIMITS_B)
  98 #define QIF_INODES      (1 << QIF_INODES_B)
  99 #define QIF_BTIME       (1 << QIF_BTIME_B)
 100 #define QIF_ITIME       (1 << QIF_ITIME_B)
 101 #define QIF_LIMITS      (QIF_BLIMITS | QIF_ILIMITS)
 102 #define QIF_USAGE       (QIF_SPACE | QIF_INODES)
 103 #define QIF_TIMES       (QIF_BTIME | QIF_ITIME)
 104 #define QIF_ALL         (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
 105
 106 struct if_dqblk {
 107         __u64 dqb_bhardlimit;
 108         __u64 dqb_bsoftlimit;
 109         __u64 dqb_curspace;
 110         __u64 dqb_ihardlimit;
 111         __u64 dqb_isoftlimit;
 112         __u64 dqb_curinodes;
 113         __u64 dqb_btime;
 114         __u64 dqb_itime;
 115         __u32 dqb_valid;
 116 };
 117
 118 /*
 119  * Structure used for setting quota information about file via quotactl
 120  * Following flags are used to specify which fields are valid
 121  */
 122 #define IIF_BGRACE      1
 123 #define IIF_IGRACE      2
 124 #define IIF_FLAGS       4
 125 #define IIF_ALL         (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
 126
 127 struct if_dqinfo {
 128         __u64 dqi_bgrace;
 129         __u64 dqi_igrace;
 130         __u32 dqi_flags;
 131         __u32 dqi_valid;
 132 };
 133
 134 /*
 135  * Definitions for quota netlink interface
 136  */
 137 #define QUOTA_NL_NOWARN 0
 138 #define QUOTA_NL_IHARDWARN 1            /* Inode hardlimit reached */
 139 #define QUOTA_NL_ISOFTLONGWARN 2        /* Inode grace time expired */
 140 #define QUOTA_NL_ISOFTWARN 3            /* Inode softlimit reached */
 141 #define QUOTA_NL_BHARDWARN 4            /* Block hardlimit reached */
 142 #define QUOTA_NL_BSOFTLONGWARN 5        /* Block grace time expired */
 143 #define QUOTA_NL_BSOFTWARN 6            /* Block softlimit reached */
 144 #define QUOTA_NL_IHARDBELOW 7           /* Usage got below inode hardlimit */
 145 #define QUOTA_NL_ISOFTBELOW 8           /* Usage got below inode softlimit */
 146 #define QUOTA_NL_BHARDBELOW 9           /* Usage got below block hardlimit */
 147 #define QUOTA_NL_BSOFTBELOW 10          /* Usage got below block softlimit */
 148
 149 enum {
 150         QUOTA_NL_C_UNSPEC,
 151         QUOTA_NL_C_WARNING,
 152         __QUOTA_NL_C_MAX,
 153 };
 154 #define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
 155
 156 enum {
 157         QUOTA_NL_A_UNSPEC,
 158         QUOTA_NL_A_QTYPE,
 159         QUOTA_NL_A_EXCESS_ID,
 160         QUOTA_NL_A_WARNING,
 161         QUOTA_NL_A_DEV_MAJOR,
 162         QUOTA_NL_A_DEV_MINOR,
 163         QUOTA_NL_A_CAUSED_ID,
 164         __QUOTA_NL_A_MAX,
 165 };
 166 #define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
 167
 168
 169 #ifdef __KERNEL__
 170 #include <linux/list.h>
 171 #include <linux/mutex.h>
 172 #include <linux/rwsem.h>
 173 #include <linux/spinlock.h>
 174 #include <linux/wait.h>
 175
 176 #include <linux/dqblk_xfs.h>
 177 #include <linux/dqblk_v1.h>
 178 #include <linux/dqblk_v2.h>
 179
 180 #include <asm/atomic.h>
 181
 182 typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
 183 typedef long long qsize_t;      /* Type in which we store sizes */
 184
 185 extern spinlock_t dq_data_lock;
 186
 187 /* Maximal numbers of writes for quota operation (insert/delete/update)
 188  * (over VFS all formats) */
 189 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
 190 #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
 191 #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
 192 #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
 193
 194 /*
 195  * Data for one user/group kept in memory
 196  */
 197 struct mem_dqblk {
 198         qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
 199         qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
 200         qsize_t dqb_curspace;   /* current used space */
 201         qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
 202         qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
 203         qsize_t dqb_isoftlimit; /* preferred inode limit */
 204         qsize_t dqb_curinodes;  /* current # allocated inodes */
 205         time_t dqb_btime;       /* time limit for excessive disk use */
 206         time_t dqb_itime;       /* time limit for excessive inode use */
 207 };
 208
 209 /*
 210  * Data for one quotafile kept in memory
 211  */
 212 struct quota_format_type;
 213
 214 struct mem_dqinfo {
 215         struct quota_format_type *dqi_format;
 216         int dqi_fmt_id;         /* Id of the dqi_format - used when turning
 217                                  * quotas on after remount RW */
 218         struct list_head dqi_dirty_list;        /* List of dirty dquots */
 219         unsigned long dqi_flags;
 220         unsigned int dqi_bgrace;
 221         unsigned int dqi_igrace;
 222         qsize_t dqi_maxblimit;
 223         qsize_t dqi_maxilimit;
 224         void *dqi_priv;
 225 };
 226
 227 struct super_block;
 228
 229 #define DQF_MASK 0xffff         /* Mask for format specific flags */
 230 #define DQF_INFO_DIRTY_B 16
 231 #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */
 232
 233 extern void mark_info_dirty(struct super_block *sb, int type);
 234 static inline int info_dirty(struct mem_dqinfo *info)
 235 {
 236         return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
 237 }
 238
 239 struct dqstats {
 240         int lookups;
 241         int drops;
 242         int reads;
 243         int writes;
 244         int cache_hits;
 245         int allocated_dquots;
 246         int free_dquots;
 247         int syncs;
 248 };
 249
 250 extern struct dqstats dqstats;
 251
 252 #define DQ_MOD_B        0       /* dquot modified since read */
 253 #define DQ_BLKS_B       1       /* uid/gid has been warned about blk limit */
 254 #define DQ_INODES_B     2       /* uid/gid has been warned about inode limit */
 255 #define DQ_FAKE_B       3       /* no limits only usage */
 256 #define DQ_READ_B       4       /* dquot was read into memory */
 257 #define DQ_ACTIVE_B     5       /* dquot is active (dquot_release not called) */
 258 #define DQ_LASTSET_B    6       /* Following 6 bits (see QIF_) are reserved\
 259                                  * for the mask of entries set via SETQUOTA\
 260                                  * quotactl. They are set under dq_data_lock\
 261                                  * and the quota format handling dquot can\
 262                                  * clear them when it sees fit. */
 263
 264 struct dquot {
 265         struct hlist_node dq_hash;      /* Hash list in memory */
 266         struct list_head dq_inuse;      /* List of all quotas */
 267         struct list_head dq_free;       /* Free list element */
 268         struct list_head dq_dirty;      /* List of dirty dquots */
 269         struct mutex dq_lock;           /* dquot IO lock */
 270         atomic_t dq_count;              /* Use count */
 271         wait_queue_head_t dq_wait_unused;       /* Wait queue for dquot to become unused */
 272         struct super_block *dq_sb;      /* superblock this applies to */
 273         unsigned int dq_id;             /* ID this applies to (uid, gid) */
 274         loff_t dq_off;                  /* Offset of dquot on disk */
 275         unsigned long dq_flags;         /* See DQ_* */
 276         short dq_type;                  /* Type of quota */
 277         struct mem_dqblk dq_dqb;        /* Diskquota usage */
 278 };
 279
 280 #define QUOTA_OK          0
 281 #define NO_QUOTA          1
 282
 283 /* Operations which must be implemented by each quota format */
 284 struct quota_format_ops {
 285         int (*check_quota_file)(struct super_block *sb, int type);      /* Detect whether file is in our format */
 286         int (*read_file_info)(struct super_block *sb, int type);        /* Read main info about file - called on quotaon() */
 287         int (*write_file_info)(struct super_block *sb, int type);       /* Write main info about file */
 288         int (*free_file_info)(struct super_block *sb, int type);        /* Called on quotaoff() */
 289         int (*read_dqblk)(struct dquot *dquot);         /* Read structure for one user */
 290         int (*commit_dqblk)(struct dquot *dquot);       /* Write structure for one user */
 291         int (*release_dqblk)(struct dquot *dquot);      /* Called when last reference to dquot is being dropped */
 292 };
 293
 294 /* Operations working with dquots */
 295 struct dquot_operations {
 296         int (*initialize) (struct inode *, int);
 297         int (*drop) (struct inode *);
 298         int (*alloc_space) (struct inode *, qsize_t, int);
 299         int (*alloc_inode) (const struct inode *, qsize_t);
 300         int (*free_space) (struct inode *, qsize_t);
 301         int (*free_inode) (const struct inode *, qsize_t);
 302         int (*transfer) (struct inode *, struct iattr *);
 303         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
 304         struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
 305         void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
 306         int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
 307         int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
 308         int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */
 309         int (*write_info) (struct super_block *, int);  /* Write of quota "superblock" */
 310         /* reserve quota for delayed block allocation */
 311         int (*reserve_space) (struct inode *, qsize_t, int);
 312         /* claim reserved quota for delayed alloc */
 313         int (*claim_space) (struct inode *, qsize_t);
 314         /* release rsved quota for delayed alloc */
 315         void (*release_rsv) (struct inode *, qsize_t);
 316         /* get reserved quota for delayed alloc */
 317         qsize_t (*get_reserved_space) (struct inode *);
 318 };
 319
 320 /* Operations handling requests from userspace */
 321 struct quotactl_ops {
 322         int (*quota_on)(struct super_block *, int, int, char *, int);
 323         int (*quota_off)(struct super_block *, int, int);
 324         int (*quota_sync)(struct super_block *, int);
 325         int (*get_info)(struct super_block *, int, struct if_dqinfo *);
 326         int (*set_info)(struct super_block *, int, struct if_dqinfo *);
 327         int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
 328         int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
 329         int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
 330         int (*set_xstate)(struct super_block *, unsigned int, int);
 331         int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
 332         int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
 333 };
 334
 335 struct quota_format_type {
 336         int qf_fmt_id;  /* Quota format id */
 337         struct quota_format_ops *qf_ops;        /* Operations of format */
 338         struct module *qf_owner;                /* Module implementing quota format */
 339         struct quota_format_type *qf_next;
 340 };
 341
 342 /* Quota state flags - they actually come in two flavors - for users and groups */
 343 enum {
 344         _DQUOT_USAGE_ENABLED = 0,               /* Track disk usage for users */
 345         _DQUOT_LIMITS_ENABLED,                  /* Enforce quota limits for users */
 346         _DQUOT_SUSPENDED,                       /* User diskquotas are off, but
 347                                                  * we have necessary info in
 348                                                  * memory to turn them on */
 349         _DQUOT_STATE_FLAGS
 350 };
 351 #define DQUOT_USAGE_ENABLED     (1 << _DQUOT_USAGE_ENABLED)
 352 #define DQUOT_LIMITS_ENABLED    (1 << _DQUOT_LIMITS_ENABLED)
 353 #define DQUOT_SUSPENDED         (1 << _DQUOT_SUSPENDED)
 354 #define DQUOT_STATE_FLAGS       (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
 355                                  DQUOT_SUSPENDED)
 356 /* Other quota flags */
 357 #define DQUOT_QUOTA_SYS_FILE    (1 << 6)        /* Quota file is a special
 358                                                  * system file and user cannot
 359                                                  * touch it. Filesystem is
 360                                                  * responsible for setting
 361                                                  * S_NOQUOTA, S_NOATIME flags
 362                                                  */
 363 #define DQUOT_NEGATIVE_USAGE    (1 << 7)        /* Allow negative quota usage */
 364
 365 static inline unsigned int dquot_state_flag(unsigned int flags, int type)
 366 {
 367         if (type == USRQUOTA)
 368                 return flags;
 369         return flags << _DQUOT_STATE_FLAGS;
 370 }
 371
 372 static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
 373 {
 374         if (type == USRQUOTA)
 375                 return flags;
 376         return flags >> _DQUOT_STATE_FLAGS;
 377 }
 378
 379 struct quota_info {
 380         unsigned int flags;                     /* Flags for diskquotas on this device */
 381         struct mutex dqio_mutex;                /* lock device while I/O in progress */
 382         struct mutex dqonoff_mutex;             /* Serialize quotaon & quotaoff */
 383         struct rw_semaphore dqptr_sem;          /* serialize ops using quota_info struct, pointers from inode to dquots */
 384         struct inode *files[MAXQUOTAS];         /* inodes of quotafiles */
 385         struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
 386         struct quota_format_ops *ops[MAXQUOTAS];        /* Operations for each type */
 387 };
 388
 389 int register_quota_format(struct quota_format_type *fmt);
 390 void unregister_quota_format(struct quota_format_type *fmt);
 391
 392 struct quota_module_name {
 393         int qm_fmt_id;
 394         char *qm_mod_name;
 395 };
 396
 397 #define INIT_QUOTA_MODULE_NAMES {\
 398         {QFMT_VFS_OLD, "quota_v1"},\
 399         {QFMT_VFS_V0, "quota_v2"},\
 400         {0, NULL}}
 401
 402 #else
 403
 404 # /* nodep */ include <sys/cdefs.h>
 405
 406 __BEGIN_DECLS
 407 long quotactl __P ((unsigned int, const char *, int, caddr_t));
 408 __END_DECLS
 409
 410 #endif /* __KERNEL__ */
 411 #endif /* _QUOTA_ */