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 #include "xfs_quota_defs.h"
  22
  23 /*
  24  * Kernel only quota definitions and functions
  25  */
  26
  27 struct xfs_trans;
  28
  29 /*
  30  * This check is done typically without holding the inode lock;
  31  * that may seem racy, but it is harmless in the context that it is used.
  32  * The inode cannot go inactive as long a reference is kept, and
  33  * therefore if dquot(s) were attached, they'll stay consistent.
  34  * If, for example, the ownership of the inode changes while
  35  * we didn't have the inode locked, the appropriate dquot(s) will be
  36  * attached atomically.
  37  */
  38 #define XFS_NOT_DQATTACHED(mp, ip) \
  39         ((XFS_IS_UQUOTA_ON(mp) && (ip)->i_udquot == NULL) || \
  40          (XFS_IS_GQUOTA_ON(mp) && (ip)->i_gdquot == NULL) || \
  41          (XFS_IS_PQUOTA_ON(mp) && (ip)->i_pdquot == NULL))
  42
  43 #define XFS_QM_NEED_QUOTACHECK(mp) \
  44         ((XFS_IS_UQUOTA_ON(mp) && \
  45                 (mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \
  46          (XFS_IS_GQUOTA_ON(mp) && \
  47                 (mp->m_sb.sb_qflags & XFS_GQUOTA_CHKD) == 0) || \
  48          (XFS_IS_PQUOTA_ON(mp) && \
  49                 (mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))
  50
  51 /*
  52  * The structure kept inside the xfs_trans_t keep track of dquot changes
  53  * within a transaction and apply them later.
  54  */
  55 typedef struct xfs_dqtrx {
  56         struct xfs_dquot *qt_dquot;       /* the dquot this refers to */
  57         ulong           qt_blk_res;       /* blks reserved on a dquot */
  58         ulong           qt_blk_res_used;  /* blks used from the reservation */
  59         ulong           qt_ino_res;       /* inode reserved on a dquot */
  60         ulong           qt_ino_res_used;  /* inodes used from the reservation */
  61         long            qt_bcount_delta;  /* dquot blk count changes */
  62         long            qt_delbcnt_delta; /* delayed dquot blk count changes */
  63         long            qt_icount_delta;  /* dquot inode count changes */
  64         ulong           qt_rtblk_res;     /* # blks reserved on a dquot */
  65         ulong           qt_rtblk_res_used;/* # blks used from reservation */
  66         long            qt_rtbcount_delta;/* dquot realtime blk changes */
  67         long            qt_delrtb_delta;  /* delayed RT blk count changes */
  68 } xfs_dqtrx_t;
  69
  70 #ifdef CONFIG_XFS_QUOTA
  71 extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
  72 extern void xfs_trans_free_dqinfo(struct xfs_trans *);
  73 extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
  74                 uint, long);
  75 extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
  76 extern void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *);
  77 extern int xfs_trans_reserve_quota_nblks(struct xfs_trans *,
  78                 struct xfs_inode *, long, long, uint);
  79 extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
  80                 struct xfs_mount *, struct xfs_dquot *,
  81                 struct xfs_dquot *, struct xfs_dquot *, long, long, uint);
  82
  83 extern int xfs_qm_vop_dqalloc(struct xfs_inode *, xfs_dqid_t, xfs_dqid_t,
  84                 prid_t, uint, struct xfs_dquot **, struct xfs_dquot **,
  85                 struct xfs_dquot **);
  86 extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
  87                 struct xfs_dquot *, struct xfs_dquot *, struct xfs_dquot *);
  88 extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
  89 extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
  90                 struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
  91 extern int xfs_qm_vop_chown_reserve(struct xfs_trans *, struct xfs_inode *,
  92                 struct xfs_dquot *, struct xfs_dquot *,
  93                 struct xfs_dquot *, uint);
  94 extern int xfs_qm_dqattach(struct xfs_inode *, uint);
  95 extern int xfs_qm_dqattach_locked(struct xfs_inode *, uint);
  96 extern void xfs_qm_dqdetach(struct xfs_inode *);
  97 extern void xfs_qm_dqrele(struct xfs_dquot *);
  98 extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
  99 extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
 100 extern void xfs_qm_mount_quotas(struct xfs_mount *);
 101 extern void xfs_qm_unmount(struct xfs_mount *);
 102 extern void xfs_qm_unmount_quotas(struct xfs_mount *);
 103
 104 #else
 105 static inline int
 106 xfs_qm_vop_dqalloc(struct xfs_inode *ip, xfs_dqid_t uid, xfs_dqid_t gid,
 107                 prid_t prid, uint flags, struct xfs_dquot **udqp,
 108                 struct xfs_dquot **gdqp, struct xfs_dquot **pdqp)
 109 {
 110         *udqp = NULL;
 111         *gdqp = NULL;
 112         *pdqp = NULL;
 113         return 0;
 114 }
 115 #define xfs_trans_dup_dqinfo(tp, tp2)
 116 #define xfs_trans_free_dqinfo(tp)
 117 #define xfs_trans_mod_dquot_byino(tp, ip, fields, delta)
 118 #define xfs_trans_apply_dquot_deltas(tp)
 119 #define xfs_trans_unreserve_and_mod_dquots(tp)
 120 static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
 121                 struct xfs_inode *ip, long nblks, long ninos, uint flags)
 122 {
 123         return 0;
 124 }
 125 static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
 126                 struct xfs_mount *mp, struct xfs_dquot *udqp,
 127                 struct xfs_dquot *gdqp, struct xfs_dquot *pdqp,
 128                 long nblks, long nions, uint flags)
 129 {
 130         return 0;
 131 }
 132 #define xfs_qm_vop_create_dqattach(tp, ip, u, g, p)
 133 #define xfs_qm_vop_rename_dqattach(it)                                  (0)
 134 #define xfs_qm_vop_chown(tp, ip, old, new)                              (NULL)
 135 #define xfs_qm_vop_chown_reserve(tp, ip, u, g, p, fl)                   (0)
 136 #define xfs_qm_dqattach(ip, fl)                                         (0)
 137 #define xfs_qm_dqattach_locked(ip, fl)                                  (0)
 138 #define xfs_qm_dqdetach(ip)
 139 #define xfs_qm_dqrele(d)
 140 #define xfs_qm_statvfs(ip, s)
 141 #define xfs_qm_newmount(mp, a, b)                                       (0)
 142 #define xfs_qm_mount_quotas(mp)
 143 #define xfs_qm_unmount(mp)
 144 #define xfs_qm_unmount_quotas(mp)
 145 #endif /* CONFIG_XFS_QUOTA */
 146
 147 #define xfs_trans_unreserve_quota_nblks(tp, ip, nblks, ninos, flags) \
 148         xfs_trans_reserve_quota_nblks(tp, ip, -(nblks), -(ninos), flags)
 149 #define xfs_trans_reserve_quota(tp, mp, ud, gd, pd, nb, ni, f) \
 150         xfs_trans_reserve_quota_bydquots(tp, mp, ud, gd, pd, nb, ni, \
 151                                 f | XFS_QMOPT_RES_REGBLKS)
 152
 153 extern int xfs_qm_dqcheck(struct xfs_mount *, xfs_disk_dquot_t *,
 154                                 xfs_dqid_t, uint, uint, char *);
 155 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
 156
 157 extern const struct xfs_buf_ops xfs_dquot_buf_ops;
 158
 159 #endif  /* __XFS_QUOTA_H__ */