fs/xfs/xfs_quota.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_QUOTA_H__
  19 #define __XFS_QUOTA_H__
  20
  21 /*
  22  * The ondisk form of a dquot structure.
  23  */
  24 #define XFS_DQUOT_MAGIC         0x4451          /* 'DQ' */
  25 #define XFS_DQUOT_VERSION       (u_int8_t)0x01  /* latest version number */
  26
  27 /*
  28  * uid_t and gid_t are hard-coded to 32 bits in the inode.
  29  * Hence, an 'id' in a dquot is 32 bits..
  30  */
  31 typedef __uint32_t      xfs_dqid_t;
  32
  33 /*
  34  * Even though users may not have quota limits occupying all 64-bits,
  35  * they may need 64-bit accounting. Hence, 64-bit quota-counters,
  36  * and quota-limits. This is a waste in the common case, but hey ...
  37  */
  38 typedef __uint64_t      xfs_qcnt_t;
  39 typedef __uint16_t      xfs_qwarncnt_t;
  40
  41 /*
  42  * This is the main portion of the on-disk representation of quota
  43  * information for a user. This is the q_core of the xfs_dquot_t that
  44  * is kept in kernel memory. We pad this with some more expansion room
  45  * to construct the on disk structure.
  46  */
  47 typedef struct  xfs_disk_dquot {
  48         __be16          d_magic;        /* dquot magic = XFS_DQUOT_MAGIC */
  49         __u8            d_version;      /* dquot version */
  50         __u8            d_flags;        /* XFS_DQ_USER/PROJ/GROUP */
  51         __be32          d_id;           /* user,project,group id */
  52         __be64          d_blk_hardlimit;/* absolute limit on disk blks */
  53         __be64          d_blk_softlimit;/* preferred limit on disk blks */
  54         __be64          d_ino_hardlimit;/* maximum # allocated inodes */
  55         __be64          d_ino_softlimit;/* preferred inode limit */
  56         __be64          d_bcount;       /* disk blocks owned by the user */
  57         __be64          d_icount;       /* inodes owned by the user */
  58         __be32          d_itimer;       /* zero if within inode limits if not,
  59                                            this is when we refuse service */
  60         __be32          d_btimer;       /* similar to above; for disk blocks */
  61         __be16          d_iwarns;       /* warnings issued wrt num inodes */
  62         __be16          d_bwarns;       /* warnings issued wrt disk blocks */
  63         __be32          d_pad0;         /* 64 bit align */
  64         __be64          d_rtb_hardlimit;/* absolute limit on realtime blks */
  65         __be64          d_rtb_softlimit;/* preferred limit on RT disk blks */
  66         __be64          d_rtbcount;     /* realtime blocks owned */
  67         __be32          d_rtbtimer;     /* similar to above; for RT disk blocks */
  68         __be16          d_rtbwarns;     /* warnings issued wrt RT disk blocks */
  69         __be16          d_pad;
  70 } xfs_disk_dquot_t;
  71
  72 /*
  73  * This is what goes on disk. This is separated from the xfs_disk_dquot because
  74  * carrying the unnecessary padding would be a waste of memory.
  75  */
  76 typedef struct xfs_dqblk {
  77         xfs_disk_dquot_t  dd_diskdq;    /* portion that lives incore as well */
  78         char              dd_fill[32];  /* filling for posterity */
  79 } xfs_dqblk_t;
  80
  81 /*
  82  * flags for q_flags field in the dquot.
  83  */
  84 #define XFS_DQ_USER             0x0001          /* a user quota */
  85 #define XFS_DQ_PROJ             0x0002          /* project quota */
  86 #define XFS_DQ_GROUP            0x0004          /* a group quota */
  87 #define XFS_DQ_FLOCKED          0x0008          /* flush lock taken */
  88 #define XFS_DQ_DIRTY            0x0010          /* dquot is dirty */
  89 #define XFS_DQ_WANT             0x0020          /* for lookup/reclaim race */
  90 #define XFS_DQ_INACTIVE         0x0040          /* dq off mplist & hashlist */
  91 #define XFS_DQ_MARKER           0x0080          /* sentinel */
  92
  93 #define XFS_DQ_ALLTYPES         (XFS_DQ_USER|XFS_DQ_PROJ|XFS_DQ_GROUP)
  94
  95 /*
  96  * In the worst case, when both user and group quotas are on,
  97  * we can have a max of three dquots changing in a single transaction.
  98  */
  99 #define XFS_DQUOT_LOGRES(mp)    (sizeof(xfs_disk_dquot_t) * 3)
 100
 101
 102 /*
 103  * These are the structures used to lay out dquots and quotaoff
 104  * records on the log. Quite similar to those of inodes.
 105  */
 106
 107 /*
 108  * log format struct for dquots.
 109  * The first two fields must be the type and size fitting into
 110  * 32 bits : log_recovery code assumes that.
 111  */
 112 typedef struct xfs_dq_logformat {
 113         __uint16_t              qlf_type;      /* dquot log item type */
 114         __uint16_t              qlf_size;      /* size of this item */
 115         xfs_dqid_t              qlf_id;        /* usr/grp/proj id : 32 bits */
 116         __int64_t               qlf_blkno;     /* blkno of dquot buffer */
 117         __int32_t               qlf_len;       /* len of dquot buffer */
 118         __uint32_t              qlf_boffset;   /* off of dquot in buffer */
 119 } xfs_dq_logformat_t;
 120
 121 /*
 122  * log format struct for QUOTAOFF records.
 123  * The first two fields must be the type and size fitting into
 124  * 32 bits : log_recovery code assumes that.
 125  * We write two LI_QUOTAOFF logitems per quotaoff, the last one keeps a pointer
 126  * to the first and ensures that the first logitem is taken out of the AIL
 127  * only when the last one is securely committed.
 128  */
 129 typedef struct xfs_qoff_logformat {
 130         unsigned short          qf_type;        /* quotaoff log item type */
 131         unsigned short          qf_size;        /* size of this item */
 132         unsigned int            qf_flags;       /* USR and/or GRP */
 133         char                    qf_pad[12];     /* padding for future */
 134 } xfs_qoff_logformat_t;
 135
 136
 137 /*
 138  * Disk quotas status in m_qflags, and also sb_qflags. 16 bits.
 139  */
 140 #define XFS_UQUOTA_ACCT 0x0001  /* user quota accounting ON */
 141 #define XFS_UQUOTA_ENFD 0x0002  /* user quota limits enforced */
 142 #define XFS_UQUOTA_CHKD 0x0004  /* quotacheck run on usr quotas */
 143 #define XFS_PQUOTA_ACCT 0x0008  /* project quota accounting ON */
 144 #define XFS_OQUOTA_ENFD 0x0010  /* other (grp/prj) quota limits enforced */
 145 #define XFS_OQUOTA_CHKD 0x0020  /* quotacheck run on other (grp/prj) quotas */
 146 #define XFS_GQUOTA_ACCT 0x0040  /* group quota accounting ON */
 147
 148 /*
 149  * Quota Accounting/Enforcement flags
 150  */
 151 #define XFS_ALL_QUOTA_ACCT      \
 152                 (XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT | XFS_PQUOTA_ACCT)
 153 #define XFS_ALL_QUOTA_ENFD      (XFS_UQUOTA_ENFD | XFS_OQUOTA_ENFD)
 154 #define XFS_ALL_QUOTA_CHKD      (XFS_UQUOTA_CHKD | XFS_OQUOTA_CHKD)
 155
 156 #define XFS_IS_QUOTA_RUNNING(mp)        ((mp)->m_qflags & XFS_ALL_QUOTA_ACCT)
 157 #define XFS_IS_QUOTA_ENFORCED(mp)       ((mp)->m_qflags & XFS_ALL_QUOTA_ENFD)
 158 #define XFS_IS_UQUOTA_RUNNING(mp)       ((mp)->m_qflags & XFS_UQUOTA_ACCT)
 159 #define XFS_IS_PQUOTA_RUNNING(mp)       ((mp)->m_qflags & XFS_PQUOTA_ACCT)
 160 #define XFS_IS_GQUOTA_RUNNING(mp)       ((mp)->m_qflags & XFS_GQUOTA_ACCT)
 161
 162 /*
 163  * Incore only flags for quotaoff - these bits get cleared when quota(s)
 164  * are in the process of getting turned off. These flags are in m_qflags but
 165  * never in sb_qflags.
 166  */
 167 #define XFS_UQUOTA_ACTIVE       0x0100  /* uquotas are being turned off */
 168 #define XFS_PQUOTA_ACTIVE       0x0200  /* pquotas are being turned off */
 169 #define XFS_GQUOTA_ACTIVE       0x0400  /* gquotas are being turned off */
 170
 171 /*
 172  * Checking XFS_IS_*QUOTA_ON() while holding any inode lock guarantees
 173  * quota will be not be switched off as long as that inode lock is held.
 174  */
 175 #define XFS_IS_QUOTA_ON(mp)     ((mp)->m_qflags & (XFS_UQUOTA_ACTIVE | \
 176                                                    XFS_GQUOTA_ACTIVE | \
 177                                                    XFS_PQUOTA_ACTIVE))
 178 #define XFS_IS_OQUOTA_ON(mp)    ((mp)->m_qflags & (XFS_GQUOTA_ACTIVE | \
 179                                                    XFS_PQUOTA_ACTIVE))
 180 #define XFS_IS_UQUOTA_ON(mp)    ((mp)->m_qflags & XFS_UQUOTA_ACTIVE)
 181 #define XFS_IS_GQUOTA_ON(mp)    ((mp)->m_qflags & XFS_GQUOTA_ACTIVE)
 182 #define XFS_IS_PQUOTA_ON(mp)    ((mp)->m_qflags & XFS_PQUOTA_ACTIVE)
 183
 184 /*
 185  * Flags to tell various functions what to do. Not all of these are meaningful
 186  * to a single function. None of these XFS_QMOPT_* flags are meant to have
 187  * persistent values (ie. their values can and will change between versions)
 188  */
 189 #define XFS_QMOPT_DQLOCK        0x0000001 /* dqlock */
 190 #define XFS_QMOPT_DQALLOC       0x0000002 /* alloc dquot ondisk if needed */
 191 #define XFS_QMOPT_UQUOTA        0x0000004 /* user dquot requested */
 192 #define XFS_QMOPT_PQUOTA        0x0000008 /* project dquot requested */
 193 #define XFS_QMOPT_FORCE_RES     0x0000010 /* ignore quota limits */
 194 #define XFS_QMOPT_DQSUSER       0x0000020 /* don't cache super users dquot */
 195 #define XFS_QMOPT_SBVERSION     0x0000040 /* change superblock version num */
 196 #define XFS_QMOPT_QUOTAOFF      0x0000080 /* quotas are being turned off */
 197 #define XFS_QMOPT_UMOUNTING     0x0000100 /* filesys is being unmounted */
 198 #define XFS_QMOPT_DOLOG         0x0000200 /* log buf changes (in quotacheck) */
 199 #define XFS_QMOPT_DOWARN        0x0000400 /* increase warning cnt if needed */
 200 #define XFS_QMOPT_ILOCKED       0x0000800 /* inode is already locked (excl) */
 201 #define XFS_QMOPT_DQREPAIR      0x0001000 /* repair dquot if damaged */
 202 #define XFS_QMOPT_GQUOTA        0x0002000 /* group dquot requested */
 203 #define XFS_QMOPT_ENOSPC        0x0004000 /* enospc instead of edquot (prj) */
 204
 205 /*
 206  * flags to xfs_trans_mod_dquot to indicate which field needs to be
 207  * modified.
 208  */
 209 #define XFS_QMOPT_RES_REGBLKS   0x0010000
 210 #define XFS_QMOPT_RES_RTBLKS    0x0020000
 211 #define XFS_QMOPT_BCOUNT        0x0040000
 212 #define XFS_QMOPT_ICOUNT        0x0080000
 213 #define XFS_QMOPT_RTBCOUNT      0x0100000
 214 #define XFS_QMOPT_DELBCOUNT     0x0200000
 215 #define XFS_QMOPT_DELRTBCOUNT   0x0400000
 216 #define XFS_QMOPT_RES_INOS      0x0800000
 217
 218 /*
 219  * flags for dqflush and dqflush_all.
 220  */
 221 #define XFS_QMOPT_SYNC          0x1000000
 222 #define XFS_QMOPT_ASYNC         0x2000000
 223 #define XFS_QMOPT_DELWRI        0x4000000
 224
 225 /*
 226  * flags for dqalloc.
 227  */
 228 #define XFS_QMOPT_INHERIT       0x8000000
 229
 230 /*
 231  * flags to xfs_trans_mod_dquot.
 232  */
 233 #define XFS_TRANS_DQ_RES_BLKS   XFS_QMOPT_RES_REGBLKS
 234 #define XFS_TRANS_DQ_RES_RTBLKS XFS_QMOPT_RES_RTBLKS
 235 #define XFS_TRANS_DQ_RES_INOS   XFS_QMOPT_RES_INOS
 236 #define XFS_TRANS_DQ_BCOUNT     XFS_QMOPT_BCOUNT
 237 #define XFS_TRANS_DQ_DELBCOUNT  XFS_QMOPT_DELBCOUNT
 238 #define XFS_TRANS_DQ_ICOUNT     XFS_QMOPT_ICOUNT
 239 #define XFS_TRANS_DQ_RTBCOUNT   XFS_QMOPT_RTBCOUNT
 240 #define XFS_TRANS_DQ_DELRTBCOUNT XFS_QMOPT_DELRTBCOUNT
 241
 242
 243 #define XFS_QMOPT_QUOTALL       \
 244                 (XFS_QMOPT_UQUOTA | XFS_QMOPT_PQUOTA | XFS_QMOPT_GQUOTA)
 245 #define XFS_QMOPT_RESBLK_MASK   (XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_RES_RTBLKS)
 246
 247 #ifdef __KERNEL__
 248 /*
 249  * This check is done typically without holding the inode lock;
 250  * that may seem racy, but it is harmless in the context that it is used.
 251  * The inode cannot go inactive as long a reference is kept, and
 252  * therefore if dquot(s) were attached, they'll stay consistent.
 253  * If, for example, the ownership of the inode changes while
 254  * we didn't have the inode locked, the appropriate dquot(s) will be
 255  * attached atomically.
 256  */
 257 #define XFS_NOT_DQATTACHED(mp, ip) ((XFS_IS_UQUOTA_ON(mp) &&\
 258                                      (ip)->i_udquot == NULL) || \
 259                                     (XFS_IS_OQUOTA_ON(mp) && \
 260                                      (ip)->i_gdquot == NULL))
 261
 262 #define XFS_QM_NEED_QUOTACHECK(mp) \
 263         ((XFS_IS_UQUOTA_ON(mp) && \
 264                 (mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \
 265          (XFS_IS_GQUOTA_ON(mp) && \
 266                 ((mp->m_sb.sb_qflags & XFS_OQUOTA_CHKD) == 0 || \
 267                  (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT))) || \
 268          (XFS_IS_PQUOTA_ON(mp) && \
 269                 ((mp->m_sb.sb_qflags & XFS_OQUOTA_CHKD) == 0 || \
 270                  (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT))))
 271
 272 #define XFS_MOUNT_QUOTA_SET1    (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 273                                  XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
 274                                  XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD)
 275
 276 #define XFS_MOUNT_QUOTA_SET2    (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 277                                  XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
 278                                  XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD)
 279
 280 #define XFS_MOUNT_QUOTA_ALL     (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 281                                  XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
 282                                  XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD|\
 283                                  XFS_GQUOTA_ACCT)
 284
 285
 286 /*
 287  * The structure kept inside the xfs_trans_t keep track of dquot changes
 288  * within a transaction and apply them later.
 289  */
 290 typedef struct xfs_dqtrx {
 291         struct xfs_dquot *qt_dquot;       /* the dquot this refers to */
 292         ulong           qt_blk_res;       /* blks reserved on a dquot */
 293         ulong           qt_blk_res_used;  /* blks used from the reservation */
 294         ulong           qt_ino_res;       /* inode reserved on a dquot */
 295         ulong           qt_ino_res_used;  /* inodes used from the reservation */
 296         long            qt_bcount_delta;  /* dquot blk count changes */
 297         long            qt_delbcnt_delta; /* delayed dquot blk count changes */
 298         long            qt_icount_delta;  /* dquot inode count changes */
 299         ulong           qt_rtblk_res;     /* # blks reserved on a dquot */
 300         ulong           qt_rtblk_res_used;/* # blks used from reservation */
 301         long            qt_rtbcount_delta;/* dquot realtime blk changes */
 302         long            qt_delrtb_delta;  /* delayed RT blk count changes */
 303 } xfs_dqtrx_t;
 304
 305 /*
 306  * Dquot transaction functions, used if quota is enabled.
 307  */
 308 typedef void    (*qo_dup_dqinfo_t)(struct xfs_trans *, struct xfs_trans *);
 309 typedef void    (*qo_mod_dquot_byino_t)(struct xfs_trans *,
 310                                 struct xfs_inode *, uint, long);
 311 typedef void    (*qo_free_dqinfo_t)(struct xfs_trans *);
 312 typedef void    (*qo_apply_dquot_deltas_t)(struct xfs_trans *);
 313 typedef void    (*qo_unreserve_and_mod_dquots_t)(struct xfs_trans *);
 314 typedef int     (*qo_reserve_quota_nblks_t)(
 315                                 struct xfs_trans *, struct xfs_mount *,
 316                                 struct xfs_inode *, long, long, uint);
 317 typedef int     (*qo_reserve_quota_bydquots_t)(
 318                                 struct xfs_trans *, struct xfs_mount *,
 319                                 struct xfs_dquot *, struct xfs_dquot *,
 320                                 long, long, uint);
 321 typedef struct xfs_dqtrxops {
 322         qo_dup_dqinfo_t                 qo_dup_dqinfo;
 323         qo_free_dqinfo_t                qo_free_dqinfo;
 324         qo_mod_dquot_byino_t            qo_mod_dquot_byino;
 325         qo_apply_dquot_deltas_t         qo_apply_dquot_deltas;
 326         qo_reserve_quota_nblks_t        qo_reserve_quota_nblks;
 327         qo_reserve_quota_bydquots_t     qo_reserve_quota_bydquots;
 328         qo_unreserve_and_mod_dquots_t   qo_unreserve_and_mod_dquots;
 329 } xfs_dqtrxops_t;
 330
 331 #define XFS_DQTRXOP(mp, tp, op, args...) \
 332                 ((mp)->m_qm_ops.xfs_dqtrxops ? \
 333                 ((mp)->m_qm_ops.xfs_dqtrxops->op)(tp, ## args) : 0)
 334
 335 #define XFS_DQTRXOP_VOID(mp, tp, op, args...) \
 336                 ((mp)->m_qm_ops.xfs_dqtrxops ? \
 337                 ((mp)->m_qm_ops.xfs_dqtrxops->op)(tp, ## args) : (void)0)
 338
 339 #define XFS_TRANS_DUP_DQINFO(mp, otp, ntp) \
 340         XFS_DQTRXOP_VOID(mp, otp, qo_dup_dqinfo, ntp)
 341 #define XFS_TRANS_FREE_DQINFO(mp, tp) \
 342         XFS_DQTRXOP_VOID(mp, tp, qo_free_dqinfo)
 343 #define XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, field, delta) \
 344         XFS_DQTRXOP_VOID(mp, tp, qo_mod_dquot_byino, ip, field, delta)
 345 #define XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp) \
 346         XFS_DQTRXOP_VOID(mp, tp, qo_apply_dquot_deltas)
 347 #define XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, ninos, fl) \
 348         XFS_DQTRXOP(mp, tp, qo_reserve_quota_nblks, mp, ip, nblks, ninos, fl)
 349 #define XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, fl) \
 350         XFS_DQTRXOP(mp, tp, qo_reserve_quota_bydquots, mp, ud, gd, nb, ni, fl)
 351 #define XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp) \
 352         XFS_DQTRXOP_VOID(mp, tp, qo_unreserve_and_mod_dquots)
 353
 354 #define XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, ninos, flags) \
 355         XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, -(nblks), -(ninos), flags)
 356 #define XFS_TRANS_RESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
 357         XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, \
 358                                 f | XFS_QMOPT_RES_REGBLKS)
 359 #define XFS_TRANS_UNRESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
 360         XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, -(nb), -(ni), \
 361                                 f | XFS_QMOPT_RES_REGBLKS)
 362
 363 extern int xfs_qm_dqcheck(xfs_disk_dquot_t *, xfs_dqid_t, uint, uint, char *);
 364 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
 365
 366 extern struct bhv_module_vfsops xfs_qmops;
 367
 368 #endif  /* __KERNEL__ */
 369
 370 #endif  /* __XFS_QUOTA_H__ */