fs/xfs/xfs_quota.h

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_QUOTA_H__
  33 #define __XFS_QUOTA_H__
  34
  35 /*
  36  * The ondisk form of a dquot structure.
  37  */
  38 #define XFS_DQUOT_MAGIC         0x4451          /* 'DQ' */
  39 #define XFS_DQUOT_VERSION       (u_int8_t)0x01  /* latest version number */
  40
  41 /*
  42  * uid_t and gid_t are hard-coded to 32 bits in the inode.
  43  * Hence, an 'id' in a dquot is 32 bits..
  44  */
  45 typedef __int32_t       xfs_dqid_t;
  46
  47 /*
  48  * Eventhough users may not have quota limits occupying all 64-bits,
  49  * they may need 64-bit accounting. Hence, 64-bit quota-counters,
  50  * and quota-limits. This is a waste in the common case, but hey ...
  51  */
  52 typedef __uint64_t      xfs_qcnt_t;
  53 typedef __uint16_t      xfs_qwarncnt_t;
  54
  55 /*
  56  * This is the main portion of the on-disk representation of quota
  57  * information for a user. This is the q_core of the xfs_dquot_t that
  58  * is kept in kernel memory. We pad this with some more expansion room
  59  * to construct the on disk structure.
  60  */
  61 typedef struct  xfs_disk_dquot {
  62 /*16*/  u_int16_t       d_magic;        /* dquot magic = XFS_DQUOT_MAGIC */
  63 /*8 */  u_int8_t        d_version;      /* dquot version */
  64 /*8 */  u_int8_t        d_flags;        /* XFS_DQ_USER/PROJ/GROUP */
  65 /*32*/  xfs_dqid_t      d_id;           /* user,project,group id */
  66 /*64*/  xfs_qcnt_t      d_blk_hardlimit;/* absolute limit on disk blks */
  67 /*64*/  xfs_qcnt_t      d_blk_softlimit;/* preferred limit on disk blks */
  68 /*64*/  xfs_qcnt_t      d_ino_hardlimit;/* maximum # allocated inodes */
  69 /*64*/  xfs_qcnt_t      d_ino_softlimit;/* preferred inode limit */
  70 /*64*/  xfs_qcnt_t      d_bcount;       /* disk blocks owned by the user */
  71 /*64*/  xfs_qcnt_t      d_icount;       /* inodes owned by the user */
  72 /*32*/  __int32_t       d_itimer;       /* zero if within inode limits if not,
  73                                            this is when we refuse service */
  74 /*32*/  __int32_t       d_btimer;       /* similar to above; for disk blocks */
  75 /*16*/  xfs_qwarncnt_t  d_iwarns;       /* warnings issued wrt num inodes */
  76 /*16*/  xfs_qwarncnt_t  d_bwarns;       /* warnings issued wrt disk blocks */
  77 /*32*/  __int32_t       d_pad0;         /* 64 bit align */
  78 /*64*/  xfs_qcnt_t      d_rtb_hardlimit;/* absolute limit on realtime blks */
  79 /*64*/  xfs_qcnt_t      d_rtb_softlimit;/* preferred limit on RT disk blks */
  80 /*64*/  xfs_qcnt_t      d_rtbcount;     /* realtime blocks owned */
  81 /*32*/  __int32_t       d_rtbtimer;     /* similar to above; for RT disk blocks */
  82 /*16*/  xfs_qwarncnt_t  d_rtbwarns;     /* warnings issued wrt RT disk blocks */
  83 /*16*/  __uint16_t      d_pad;
  84 } xfs_disk_dquot_t;
  85
  86 /*
  87  * This is what goes on disk. This is separated from the xfs_disk_dquot because
  88  * carrying the unnecessary padding would be a waste of memory.
  89  */
  90 typedef struct xfs_dqblk {
  91         xfs_disk_dquot_t  dd_diskdq;    /* portion that lives incore as well */
  92         char              dd_fill[32];  /* filling for posterity */
  93 } xfs_dqblk_t;
  94
  95 /*
  96  * flags for q_flags field in the dquot.
  97  */
  98 #define XFS_DQ_USER             0x0001          /* a user quota */
  99 /* #define XFS_DQ_PROJ          0x0002          -- project quota (IRIX) */
 100 #define XFS_DQ_GROUP            0x0004          /* a group quota */
 101 #define XFS_DQ_FLOCKED          0x0008          /* flush lock taken */
 102 #define XFS_DQ_DIRTY            0x0010          /* dquot is dirty */
 103 #define XFS_DQ_WANT             0x0020          /* for lookup/reclaim race */
 104 #define XFS_DQ_INACTIVE         0x0040          /* dq off mplist & hashlist */
 105 #define XFS_DQ_MARKER           0x0080          /* sentinel */
 106
 107 /*
 108  * In the worst case, when both user and group quotas are on,
 109  * we can have a max of three dquots changing in a single transaction.
 110  */
 111 #define XFS_DQUOT_LOGRES(mp)    (sizeof(xfs_disk_dquot_t) * 3)
 112
 113
 114 /*
 115  * These are the structures used to lay out dquots and quotaoff
 116  * records on the log. Quite similar to those of inodes.
 117  */
 118
 119 /*
 120  * log format struct for dquots.
 121  * The first two fields must be the type and size fitting into
 122  * 32 bits : log_recovery code assumes that.
 123  */
 124 typedef struct xfs_dq_logformat {
 125         __uint16_t              qlf_type;      /* dquot log item type */
 126         __uint16_t              qlf_size;      /* size of this item */
 127         xfs_dqid_t              qlf_id;        /* usr/grp id number : 32 bits */
 128         __int64_t               qlf_blkno;     /* blkno of dquot buffer */
 129         __int32_t               qlf_len;       /* len of dquot buffer */
 130         __uint32_t              qlf_boffset;   /* off of dquot in buffer */
 131 } xfs_dq_logformat_t;
 132
 133 /*
 134  * log format struct for QUOTAOFF records.
 135  * The first two fields must be the type and size fitting into
 136  * 32 bits : log_recovery code assumes that.
 137  * We write two LI_QUOTAOFF logitems per quotaoff, the last one keeps a pointer
 138  * to the first and ensures that the first logitem is taken out of the AIL
 139  * only when the last one is securely committed.
 140  */
 141 typedef struct xfs_qoff_logformat {
 142         unsigned short          qf_type;        /* quotaoff log item type */
 143         unsigned short          qf_size;        /* size of this item */
 144         unsigned int            qf_flags;       /* USR and/or GRP */
 145         char                    qf_pad[12];     /* padding for future */
 146 } xfs_qoff_logformat_t;
 147
 148
 149 /*
 150  * Disk quotas status in m_qflags, and also sb_qflags. 16 bits.
 151  */
 152 #define XFS_UQUOTA_ACCT 0x0001  /* user quota accounting ON */
 153 #define XFS_UQUOTA_ENFD 0x0002  /* user quota limits enforced */
 154 #define XFS_UQUOTA_CHKD 0x0004  /* quotacheck run on usr quotas */
 155 #define XFS_PQUOTA_ACCT 0x0008  /* (IRIX) project quota accounting ON */
 156 #define XFS_GQUOTA_ENFD 0x0010  /* group quota limits enforced */
 157 #define XFS_GQUOTA_CHKD 0x0020  /* quotacheck run on grp quotas */
 158 #define XFS_GQUOTA_ACCT 0x0040  /* group quota accounting ON */
 159
 160 /*
 161  * Incore only flags for quotaoff - these bits get cleared when quota(s)
 162  * are in the process of getting turned off. These flags are in m_qflags but
 163  * never in sb_qflags.
 164  */
 165 #define XFS_UQUOTA_ACTIVE       0x0080  /* uquotas are being turned off */
 166 #define XFS_GQUOTA_ACTIVE       0x0100  /* gquotas are being turned off */
 167
 168 /*
 169  * Checking XFS_IS_*QUOTA_ON() while holding any inode lock guarantees
 170  * quota will be not be switched off as long as that inode lock is held.
 171  */
 172 #define XFS_IS_QUOTA_ON(mp)     ((mp)->m_qflags & (XFS_UQUOTA_ACTIVE | \
 173                                                    XFS_GQUOTA_ACTIVE))
 174 #define XFS_IS_UQUOTA_ON(mp)    ((mp)->m_qflags & XFS_UQUOTA_ACTIVE)
 175 #define XFS_IS_GQUOTA_ON(mp)    ((mp)->m_qflags & XFS_GQUOTA_ACTIVE)
 176
 177 /*
 178  * Flags to tell various functions what to do. Not all of these are meaningful
 179  * to a single function. None of these XFS_QMOPT_* flags are meant to have
 180  * persistent values (ie. their values can and will change between versions)
 181  */
 182 #define XFS_QMOPT_DQLOCK        0x0000001 /* dqlock */
 183 #define XFS_QMOPT_DQALLOC       0x0000002 /* alloc dquot ondisk if needed */
 184 #define XFS_QMOPT_UQUOTA        0x0000004 /* user dquot requested */
 185 #define XFS_QMOPT_GQUOTA        0x0000008 /* group dquot requested */
 186 #define XFS_QMOPT_FORCE_RES     0x0000010 /* ignore quota limits */
 187 #define XFS_QMOPT_DQSUSER       0x0000020 /* don't cache super users dquot */
 188 #define XFS_QMOPT_SBVERSION     0x0000040 /* change superblock version num */
 189 #define XFS_QMOPT_QUOTAOFF      0x0000080 /* quotas are being turned off */
 190 #define XFS_QMOPT_UMOUNTING     0x0000100 /* filesys is being unmounted */
 191 #define XFS_QMOPT_DOLOG         0x0000200 /* log buf changes (in quotacheck) */
 192 #define XFS_QMOPT_DOWARN        0x0000400 /* increase warning cnt if necessary */
 193 #define XFS_QMOPT_ILOCKED       0x0000800 /* inode is already locked (excl) */
 194 #define XFS_QMOPT_DQREPAIR      0x0001000 /* repair dquot, if damaged. */
 195
 196 /*
 197  * flags to xfs_trans_mod_dquot to indicate which field needs to be
 198  * modified.
 199  */
 200 #define XFS_QMOPT_RES_REGBLKS   0x0010000
 201 #define XFS_QMOPT_RES_RTBLKS    0x0020000
 202 #define XFS_QMOPT_BCOUNT        0x0040000
 203 #define XFS_QMOPT_ICOUNT        0x0080000
 204 #define XFS_QMOPT_RTBCOUNT      0x0100000
 205 #define XFS_QMOPT_DELBCOUNT     0x0200000
 206 #define XFS_QMOPT_DELRTBCOUNT   0x0400000
 207 #define XFS_QMOPT_RES_INOS      0x0800000
 208
 209 /*
 210  * flags for dqflush and dqflush_all.
 211  */
 212 #define XFS_QMOPT_SYNC          0x1000000
 213 #define XFS_QMOPT_ASYNC         0x2000000
 214 #define XFS_QMOPT_DELWRI        0x4000000
 215
 216 /*
 217  * flags for dqalloc.
 218  */
 219 #define XFS_QMOPT_INHERIT       0x8000000
 220
 221 /*
 222  * flags to xfs_trans_mod_dquot.
 223  */
 224 #define XFS_TRANS_DQ_RES_BLKS   XFS_QMOPT_RES_REGBLKS
 225 #define XFS_TRANS_DQ_RES_RTBLKS XFS_QMOPT_RES_RTBLKS
 226 #define XFS_TRANS_DQ_RES_INOS   XFS_QMOPT_RES_INOS
 227 #define XFS_TRANS_DQ_BCOUNT     XFS_QMOPT_BCOUNT
 228 #define XFS_TRANS_DQ_DELBCOUNT  XFS_QMOPT_DELBCOUNT
 229 #define XFS_TRANS_DQ_ICOUNT     XFS_QMOPT_ICOUNT
 230 #define XFS_TRANS_DQ_RTBCOUNT   XFS_QMOPT_RTBCOUNT
 231 #define XFS_TRANS_DQ_DELRTBCOUNT XFS_QMOPT_DELRTBCOUNT
 232
 233
 234 #define XFS_QMOPT_QUOTALL       (XFS_QMOPT_UQUOTA|XFS_QMOPT_GQUOTA)
 235 #define XFS_QMOPT_RESBLK_MASK   (XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_RES_RTBLKS)
 236
 237 #ifdef __KERNEL__
 238 /*
 239  * This check is done typically without holding the inode lock;
 240  * that may seem racey, but it is harmless in the context that it is used.
 241  * The inode cannot go inactive as long a reference is kept, and
 242  * therefore if dquot(s) were attached, they'll stay consistent.
 243  * If, for example, the ownership of the inode changes while
 244  * we didn't have the inode locked, the appropriate dquot(s) will be
 245  * attached atomically.
 246  */
 247 #define XFS_NOT_DQATTACHED(mp, ip) ((XFS_IS_UQUOTA_ON(mp) &&\
 248                                      (ip)->i_udquot == NULL) || \
 249                                     (XFS_IS_GQUOTA_ON(mp) && \
 250                                      (ip)->i_gdquot == NULL))
 251
 252 #define XFS_QM_NEED_QUOTACHECK(mp) ((XFS_IS_UQUOTA_ON(mp) && \
 253                                      (mp->m_sb.sb_qflags & \
 254                                       XFS_UQUOTA_CHKD) == 0) || \
 255                                     (XFS_IS_GQUOTA_ON(mp) && \
 256                                      (mp->m_sb.sb_qflags & \
 257                                       XFS_GQUOTA_CHKD) == 0))
 258
 259 #define XFS_MOUNT_QUOTA_ALL     (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 260                                  XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
 261                                  XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD)
 262 #define XFS_MOUNT_QUOTA_MASK    (XFS_MOUNT_QUOTA_ALL | XFS_UQUOTA_ACTIVE | \
 263                                  XFS_GQUOTA_ACTIVE)
 264
 265
 266 /*
 267  * The structure kept inside the xfs_trans_t keep track of dquot changes
 268  * within a transaction and apply them later.
 269  */
 270 typedef struct xfs_dqtrx {
 271         struct xfs_dquot *qt_dquot;       /* the dquot this refers to */
 272         ulong           qt_blk_res;       /* blks reserved on a dquot */
 273         ulong           qt_blk_res_used;  /* blks used from the reservation */
 274         ulong           qt_ino_res;       /* inode reserved on a dquot */
 275         ulong           qt_ino_res_used;  /* inodes used from the reservation */
 276         long            qt_bcount_delta;  /* dquot blk count changes */
 277         long            qt_delbcnt_delta; /* delayed dquot blk count changes */
 278         long            qt_icount_delta;  /* dquot inode count changes */
 279         ulong           qt_rtblk_res;     /* # blks reserved on a dquot */
 280         ulong           qt_rtblk_res_used;/* # blks used from reservation */
 281         long            qt_rtbcount_delta;/* dquot realtime blk changes */
 282         long            qt_delrtb_delta;  /* delayed RT blk count changes */
 283 } xfs_dqtrx_t;
 284
 285 /*
 286  * Dquot transaction functions, used if quota is enabled.
 287  */
 288 typedef void    (*qo_dup_dqinfo_t)(struct xfs_trans *, struct xfs_trans *);
 289 typedef void    (*qo_mod_dquot_byino_t)(struct xfs_trans *,
 290                                 struct xfs_inode *, uint, long);
 291 typedef void    (*qo_free_dqinfo_t)(struct xfs_trans *);
 292 typedef void    (*qo_apply_dquot_deltas_t)(struct xfs_trans *);
 293 typedef void    (*qo_unreserve_and_mod_dquots_t)(struct xfs_trans *);
 294 typedef int     (*qo_reserve_quota_nblks_t)(
 295                                 struct xfs_trans *, struct xfs_mount *,
 296                                 struct xfs_inode *, long, long, uint);
 297 typedef int     (*qo_reserve_quota_bydquots_t)(
 298                                 struct xfs_trans *, struct xfs_mount *,
 299                                 struct xfs_dquot *, struct xfs_dquot *,
 300                                 long, long, uint);
 301 typedef struct xfs_dqtrxops {
 302         qo_dup_dqinfo_t                 qo_dup_dqinfo;
 303         qo_free_dqinfo_t                qo_free_dqinfo;
 304         qo_mod_dquot_byino_t            qo_mod_dquot_byino;
 305         qo_apply_dquot_deltas_t         qo_apply_dquot_deltas;
 306         qo_reserve_quota_nblks_t        qo_reserve_quota_nblks;
 307         qo_reserve_quota_bydquots_t     qo_reserve_quota_bydquots;
 308         qo_unreserve_and_mod_dquots_t   qo_unreserve_and_mod_dquots;
 309 } xfs_dqtrxops_t;
 310
 311 #define XFS_DQTRXOP(mp, tp, op, args...) \
 312                 ((mp)->m_qm_ops.xfs_dqtrxops ? \
 313                 ((mp)->m_qm_ops.xfs_dqtrxops->op)(tp, ## args) : 0)
 314
 315 #define XFS_DQTRXOP_VOID(mp, tp, op, args...) \
 316                 ((mp)->m_qm_ops.xfs_dqtrxops ? \
 317                 ((mp)->m_qm_ops.xfs_dqtrxops->op)(tp, ## args) : (void)0)
 318
 319 #define XFS_TRANS_DUP_DQINFO(mp, otp, ntp) \
 320         XFS_DQTRXOP_VOID(mp, otp, qo_dup_dqinfo, ntp)
 321 #define XFS_TRANS_FREE_DQINFO(mp, tp) \
 322         XFS_DQTRXOP_VOID(mp, tp, qo_free_dqinfo)
 323 #define XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, field, delta) \
 324         XFS_DQTRXOP_VOID(mp, tp, qo_mod_dquot_byino, ip, field, delta)
 325 #define XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp) \
 326         XFS_DQTRXOP_VOID(mp, tp, qo_apply_dquot_deltas)
 327 #define XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, ninos, fl) \
 328         XFS_DQTRXOP(mp, tp, qo_reserve_quota_nblks, mp, ip, nblks, ninos, fl)
 329 #define XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, fl) \
 330         XFS_DQTRXOP(mp, tp, qo_reserve_quota_bydquots, mp, ud, gd, nb, ni, fl)
 331 #define XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp) \
 332         XFS_DQTRXOP_VOID(mp, tp, qo_unreserve_and_mod_dquots)
 333
 334 #define XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, nblks) \
 335         XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, 0, \
 336                                 XFS_QMOPT_RES_REGBLKS)
 337 #define XFS_TRANS_RESERVE_BLKQUOTA_FORCE(mp, tp, ip, nblks) \
 338         XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, 0, \
 339                                 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES)
 340 #define XFS_TRANS_UNRESERVE_BLKQUOTA(mp, tp, ip, nblks) \
 341         XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, -(nblks), 0, \
 342                                 XFS_QMOPT_RES_REGBLKS)
 343 #define XFS_TRANS_RESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
 344         XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, \
 345                                 f | XFS_QMOPT_RES_REGBLKS)
 346 #define XFS_TRANS_UNRESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
 347         XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, -(nb), -(ni), \
 348                                 f | XFS_QMOPT_RES_REGBLKS)
 349
 350 extern int xfs_qm_dqcheck(xfs_disk_dquot_t *, xfs_dqid_t, uint, uint, char *);
 351
 352 extern struct bhv_vfsops xfs_qmops;
 353
 354 #endif  /* __KERNEL__ */
 355
 356 #endif  /* __XFS_QUOTA_H__ */