fs/xfs/xfs_quota.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_QUOTA_H__
   7 #define __XFS_QUOTA_H__
   8
   9 #include "xfs_quota_defs.h"
  10
  11 /*
  12  * Kernel only quota definitions and functions
  13  */
  14
  15 struct xfs_trans;
  16 struct xfs_buf;
  17
  18 /*
  19  * This check is done typically without holding the inode lock;
  20  * that may seem racy, but it is harmless in the context that it is used.
  21  * The inode cannot go inactive as long a reference is kept, and
  22  * therefore if dquot(s) were attached, they'll stay consistent.
  23  * If, for example, the ownership of the inode changes while
  24  * we didn't have the inode locked, the appropriate dquot(s) will be
  25  * attached atomically.
  26  */
  27 #define XFS_NOT_DQATTACHED(mp, ip) \
  28         ((XFS_IS_UQUOTA_ON(mp) && (ip)->i_udquot == NULL) || \
  29          (XFS_IS_GQUOTA_ON(mp) && (ip)->i_gdquot == NULL) || \
  30          (XFS_IS_PQUOTA_ON(mp) && (ip)->i_pdquot == NULL))
  31
  32 #define XFS_IS_DQDETACHED(ip) \
  33         ((ip)->i_udquot == NULL && \
  34          (ip)->i_gdquot == NULL && \
  35          (ip)->i_pdquot == NULL)
  36
  37 #define XFS_QM_NEED_QUOTACHECK(mp) \
  38         ((XFS_IS_UQUOTA_ON(mp) && \
  39                 (mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \
  40          (XFS_IS_GQUOTA_ON(mp) && \
  41                 (mp->m_sb.sb_qflags & XFS_GQUOTA_CHKD) == 0) || \
  42          (XFS_IS_PQUOTA_ON(mp) && \
  43                 (mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))
  44
  45 static inline uint
  46 xfs_quota_chkd_flag(
  47         xfs_dqtype_t            type)
  48 {
  49         switch (type) {
  50         case XFS_DQTYPE_USER:
  51                 return XFS_UQUOTA_CHKD;
  52         case XFS_DQTYPE_GROUP:
  53                 return XFS_GQUOTA_CHKD;
  54         case XFS_DQTYPE_PROJ:
  55                 return XFS_PQUOTA_CHKD;
  56         default:
  57                 return 0;
  58         }
  59 }
  60
  61 /*
  62  * The structure kept inside the xfs_trans_t keep track of dquot changes
  63  * within a transaction and apply them later.
  64  */
  65 struct xfs_dqtrx {
  66         struct xfs_dquot *qt_dquot;       /* the dquot this refers to */
  67
  68         uint64_t        qt_blk_res;       /* blks reserved on a dquot */
  69         int64_t         qt_bcount_delta;  /* dquot blk count changes */
  70         int64_t         qt_delbcnt_delta; /* delayed dquot blk count changes */
  71
  72         uint64_t        qt_rtblk_res;     /* # blks reserved on a dquot */
  73         uint64_t        qt_rtblk_res_used;/* # blks used from reservation */
  74         int64_t         qt_rtbcount_delta;/* dquot realtime blk changes */
  75         int64_t         qt_delrtb_delta;  /* delayed RT blk count changes */
  76
  77         uint64_t        qt_ino_res;       /* inode reserved on a dquot */
  78         uint64_t        qt_ino_res_used;  /* inodes used from the reservation */
  79         int64_t         qt_icount_delta;  /* dquot inode count changes */
  80 };
  81
  82 enum xfs_apply_dqtrx_type {
  83         XFS_APPLY_DQTRX_COMMIT = 0,
  84         XFS_APPLY_DQTRX_UNRESERVE,
  85 };
  86
  87 /*
  88  * Parameters for applying dqtrx changes to a dquot.  The hook function arg
  89  * parameter is enum xfs_apply_dqtrx_type.
  90  */
  91 struct xfs_apply_dqtrx_params {
  92         uintptr_t               tx_id;
  93         xfs_ino_t               ino;
  94         xfs_dqtype_t            q_type;
  95         xfs_dqid_t              q_id;
  96 };
  97
  98 #ifdef CONFIG_XFS_QUOTA
  99 extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
 100 extern void xfs_trans_free_dqinfo(struct xfs_trans *);
 101 extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
 102                 uint, int64_t);
 103 extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
 104 extern void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *);
 105 int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp, struct xfs_inode *ip,
 106                 int64_t dblocks, int64_t rblocks, bool force);
 107 extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
 108                 struct xfs_mount *, struct xfs_dquot *,
 109                 struct xfs_dquot *, struct xfs_dquot *, int64_t, long, uint);
 110 int xfs_trans_reserve_quota_icreate(struct xfs_trans *tp,
 111                 struct xfs_dquot *udqp, struct xfs_dquot *gdqp,
 112                 struct xfs_dquot *pdqp, int64_t dblocks);
 113
 114 extern int xfs_qm_vop_dqalloc(struct xfs_inode *, kuid_t, kgid_t,
 115                 prid_t, uint, struct xfs_dquot **, struct xfs_dquot **,
 116                 struct xfs_dquot **);
 117 extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
 118                 struct xfs_dquot *, struct xfs_dquot *, struct xfs_dquot *);
 119 extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
 120 extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
 121                 struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
 122 extern int xfs_qm_dqattach(struct xfs_inode *);
 123 extern int xfs_qm_dqattach_locked(struct xfs_inode *ip, bool doalloc);
 124 extern void xfs_qm_dqdetach(struct xfs_inode *);
 125 extern void xfs_qm_dqrele(struct xfs_dquot *);
 126 extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
 127 extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
 128 void xfs_qm_resume_quotaon(struct xfs_mount *mp);
 129 extern void xfs_qm_mount_quotas(struct xfs_mount *);
 130 extern void xfs_qm_unmount(struct xfs_mount *);
 131 extern void xfs_qm_unmount_quotas(struct xfs_mount *);
 132 bool xfs_inode_near_dquot_enforcement(struct xfs_inode *ip, xfs_dqtype_t type);
 133 int xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks);
 134
 135 # ifdef CONFIG_XFS_LIVE_HOOKS
 136 void xfs_trans_mod_ino_dquot(struct xfs_trans *tp, struct xfs_inode *ip,
 137                 struct xfs_dquot *dqp, unsigned int field, int64_t delta);
 138
 139 struct xfs_quotainfo;
 140
 141 struct xfs_dqtrx_hook {
 142         struct xfs_hook         mod_hook;
 143         struct xfs_hook         apply_hook;
 144 };
 145
 146 void xfs_dqtrx_hook_disable(void);
 147 void xfs_dqtrx_hook_enable(void);
 148
 149 int xfs_dqtrx_hook_add(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
 150 void xfs_dqtrx_hook_del(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
 151 void xfs_dqtrx_hook_setup(struct xfs_dqtrx_hook *hook, notifier_fn_t mod_fn,
 152                 notifier_fn_t apply_fn);
 153 # else
 154 #  define xfs_trans_mod_ino_dquot(tp, ip, dqp, field, delta) \
 155                 xfs_trans_mod_dquot((tp), (dqp), (field), (delta))
 156 # endif /* CONFIG_XFS_LIVE_HOOKS */
 157
 158 #else
 159 static inline int
 160 xfs_qm_vop_dqalloc(struct xfs_inode *ip, kuid_t kuid, kgid_t kgid,
 161                 prid_t prid, uint flags, struct xfs_dquot **udqp,
 162                 struct xfs_dquot **gdqp, struct xfs_dquot **pdqp)
 163 {
 164         *udqp = NULL;
 165         *gdqp = NULL;
 166         *pdqp = NULL;
 167         return 0;
 168 }
 169 #define xfs_trans_dup_dqinfo(tp, tp2)
 170 #define xfs_trans_free_dqinfo(tp)
 171 static inline void xfs_trans_mod_dquot_byino(struct xfs_trans *tp,
 172                 struct xfs_inode *ip, uint field, int64_t delta)
 173 {
 174 }
 175 #define xfs_trans_apply_dquot_deltas(tp)
 176 #define xfs_trans_unreserve_and_mod_dquots(tp)
 177 static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
 178                 struct xfs_inode *ip, int64_t dblocks, int64_t rblocks,
 179                 bool force)
 180 {
 181         return 0;
 182 }
 183 static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
 184                 struct xfs_mount *mp, struct xfs_dquot *udqp,
 185                 struct xfs_dquot *gdqp, struct xfs_dquot *pdqp,
 186                 int64_t nblks, long nions, uint flags)
 187 {
 188         return 0;
 189 }
 190
 191 static inline int
 192 xfs_trans_reserve_quota_icreate(struct xfs_trans *tp, struct xfs_dquot *udqp,
 193                 struct xfs_dquot *gdqp, struct xfs_dquot *pdqp, int64_t dblocks)
 194 {
 195         return 0;
 196 }
 197
 198 #define xfs_qm_vop_create_dqattach(tp, ip, u, g, p)
 199 #define xfs_qm_vop_rename_dqattach(it)                                  (0)
 200 #define xfs_qm_vop_chown(tp, ip, old, new)                              (NULL)
 201 #define xfs_qm_dqattach(ip)                                             (0)
 202 #define xfs_qm_dqattach_locked(ip, fl)                                  (0)
 203 #define xfs_qm_dqdetach(ip)
 204 #define xfs_qm_dqrele(d)                        do { (d) = (d); } while(0)
 205 #define xfs_qm_statvfs(ip, s)                   do { } while(0)
 206 #define xfs_qm_newmount(mp, a, b)                                       (0)
 207 #define xfs_qm_resume_quotaon(mp)               ((void)0)
 208 #define xfs_qm_mount_quotas(mp)
 209 #define xfs_qm_unmount(mp)
 210 #define xfs_qm_unmount_quotas(mp)
 211 #define xfs_inode_near_dquot_enforcement(ip, type)                      (false)
 212
 213 static inline int xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks)
 214 {
 215         return 0;
 216 }
 217
 218 # ifdef CONFIG_XFS_LIVE_HOOKS
 219 #  define xfs_dqtrx_hook_enable()               ((void)0)
 220 #  define xfs_dqtrx_hook_disable()              ((void)0)
 221 # endif /* CONFIG_XFS_LIVE_HOOKS */
 222
 223 #endif /* CONFIG_XFS_QUOTA */
 224
 225 static inline void
 226 xfs_quota_unreserve_blkres(struct xfs_inode *ip, uint64_t blocks)
 227 {
 228         /* don't return an error as unreserving quotas can't fail */
 229         xfs_quota_reserve_blkres(ip, -(int64_t)blocks);
 230 }
 231
 232 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
 233
 234 #endif  /* __XFS_QUOTA_H__ */