1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_DQUOT_H__ 7 #define __XFS_DQUOT_H__ 8 9 /* 10 * Dquots are structures that hold quota information about a user or a group, 11 * much like inodes are for files. In fact, dquots share many characteristics 12 * with inodes. However, dquots can also be a centralized resource, relative 13 * to a collection of inodes. In this respect, dquots share some characteristics 14 * of the superblock. 15 * XFS dquots exploit both those in its algorithms. They make every attempt 16 * to not be a bottleneck when quotas are on and have minimal impact, if any, 17 * when quotas are off. 18 */ 19 20 struct xfs_mount; 21 struct xfs_trans; 22 23 enum { 24 XFS_QLOWSP_1_PCNT = 0, 25 XFS_QLOWSP_3_PCNT, 26 XFS_QLOWSP_5_PCNT, 27 XFS_QLOWSP_MAX 28 }; 29 30 struct xfs_dquot_res { 31 /* Total resources allocated and reserved. */ 32 xfs_qcnt_t reserved; 33 34 /* Total resources allocated. */ 35 xfs_qcnt_t count; 36 37 /* Absolute and preferred limits. */ 38 xfs_qcnt_t hardlimit; 39 xfs_qcnt_t softlimit; 40 41 /* 42 * For root dquots, this is the default grace period, in seconds. 43 * Otherwise, this is when the quota grace period expires, 44 * in seconds since the Unix epoch. 45 */ 46 time64_t timer; 47 48 /* 49 * For root dquots, this is the maximum number of warnings that will 50 * be issued for this quota type. Otherwise, this is the number of 51 * warnings issued against this quota. Note that none of this is 52 * implemented. 53 */ 54 xfs_qwarncnt_t warnings; 55 }; 56 57 /* 58 * The incore dquot structure 59 */ 60 struct xfs_dquot { 61 struct list_head q_lru; 62 struct xfs_mount *q_mount; 63 xfs_dqtype_t q_type; 64 uint16_t q_flags; 65 xfs_dqid_t q_id; 66 uint q_nrefs; 67 int q_bufoffset; 68 xfs_daddr_t q_blkno; 69 xfs_fileoff_t q_fileoffset; 70 71 struct xfs_dquot_res q_blk; /* regular blocks */ 72 struct xfs_dquot_res q_ino; /* inodes */ 73 struct xfs_dquot_res q_rtb; /* realtime blocks */ 74 75 struct xfs_dq_logitem q_logitem; 76 77 xfs_qcnt_t q_prealloc_lo_wmark; 78 xfs_qcnt_t q_prealloc_hi_wmark; 79 int64_t q_low_space[XFS_QLOWSP_MAX]; 80 struct mutex q_qlock; 81 struct completion q_flush; 82 atomic_t q_pincount; 83 struct wait_queue_head q_pinwait; 84 }; 85 86 /* 87 * Lock hierarchy for q_qlock: 88 * XFS_QLOCK_NORMAL is the implicit default, 89 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2 90 */ 91 enum { 92 XFS_QLOCK_NORMAL = 0, 93 XFS_QLOCK_NESTED, 94 }; 95 96 /* 97 * Manage the q_flush completion queue embedded in the dquot. This completion 98 * queue synchronizes processes attempting to flush the in-core dquot back to 99 * disk. 100 */ 101 static inline void xfs_dqflock(struct xfs_dquot *dqp) 102 { 103 wait_for_completion(&dqp->q_flush); 104 } 105 106 static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp) 107 { 108 return try_wait_for_completion(&dqp->q_flush); 109 } 110 111 static inline void xfs_dqfunlock(struct xfs_dquot *dqp) 112 { 113 complete(&dqp->q_flush); 114 } 115 116 static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp) 117 { 118 return mutex_trylock(&dqp->q_qlock); 119 } 120 121 static inline void xfs_dqlock(struct xfs_dquot *dqp) 122 { 123 mutex_lock(&dqp->q_qlock); 124 } 125 126 static inline void xfs_dqunlock(struct xfs_dquot *dqp) 127 { 128 mutex_unlock(&dqp->q_qlock); 129 } 130 131 static inline int 132 xfs_dquot_type(const struct xfs_dquot *dqp) 133 { 134 return dqp->q_type & XFS_DQTYPE_REC_MASK; 135 } 136 137 static inline int xfs_this_quota_on(struct xfs_mount *mp, xfs_dqtype_t type) 138 { 139 switch (type) { 140 case XFS_DQTYPE_USER: 141 return XFS_IS_UQUOTA_ON(mp); 142 case XFS_DQTYPE_GROUP: 143 return XFS_IS_GQUOTA_ON(mp); 144 case XFS_DQTYPE_PROJ: 145 return XFS_IS_PQUOTA_ON(mp); 146 default: 147 return 0; 148 } 149 } 150 151 static inline struct xfs_dquot *xfs_inode_dquot( 152 struct xfs_inode *ip, 153 xfs_dqtype_t type) 154 { 155 switch (type) { 156 case XFS_DQTYPE_USER: 157 return ip->i_udquot; 158 case XFS_DQTYPE_GROUP: 159 return ip->i_gdquot; 160 case XFS_DQTYPE_PROJ: 161 return ip->i_pdquot; 162 default: 163 return NULL; 164 } 165 } 166 167 /* Decide if the dquot's limits are actually being enforced. */ 168 static inline bool 169 xfs_dquot_is_enforced( 170 const struct xfs_dquot *dqp) 171 { 172 switch (xfs_dquot_type(dqp)) { 173 case XFS_DQTYPE_USER: 174 return XFS_IS_UQUOTA_ENFORCED(dqp->q_mount); 175 case XFS_DQTYPE_GROUP: 176 return XFS_IS_GQUOTA_ENFORCED(dqp->q_mount); 177 case XFS_DQTYPE_PROJ: 178 return XFS_IS_PQUOTA_ENFORCED(dqp->q_mount); 179 } 180 ASSERT(0); 181 return false; 182 } 183 184 /* 185 * Check whether a dquot is under low free space conditions. We assume the quota 186 * is enabled and enforced. 187 */ 188 static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp) 189 { 190 int64_t freesp; 191 192 freesp = dqp->q_blk.hardlimit - dqp->q_blk.reserved; 193 if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT]) 194 return true; 195 196 return false; 197 } 198 199 void xfs_dquot_to_disk(struct xfs_disk_dquot *ddqp, struct xfs_dquot *dqp); 200 201 #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock))) 202 #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->q_flags & XFS_DQFLAG_DIRTY) 203 204 void xfs_qm_dqdestroy(struct xfs_dquot *dqp); 205 int xfs_qm_dqflush(struct xfs_dquot *dqp, struct xfs_buf **bpp); 206 void xfs_qm_dqunpin_wait(struct xfs_dquot *dqp); 207 void xfs_qm_adjust_dqtimers(struct xfs_dquot *d); 208 void xfs_qm_adjust_dqlimits(struct xfs_dquot *d); 209 xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip, 210 xfs_dqtype_t type); 211 int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id, 212 xfs_dqtype_t type, bool can_alloc, 213 struct xfs_dquot **dqpp); 214 int xfs_qm_dqget_inode(struct xfs_inode *ip, xfs_dqtype_t type, 215 bool can_alloc, struct xfs_dquot **dqpp); 216 int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id, 217 xfs_dqtype_t type, struct xfs_dquot **dqpp); 218 int xfs_qm_dqget_uncached(struct xfs_mount *mp, 219 xfs_dqid_t id, xfs_dqtype_t type, 220 struct xfs_dquot **dqpp); 221 void xfs_qm_dqput(struct xfs_dquot *dqp); 222 223 void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *); 224 225 void xfs_dquot_set_prealloc_limits(struct xfs_dquot *); 226 227 static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp) 228 { 229 xfs_dqlock(dqp); 230 dqp->q_nrefs++; 231 xfs_dqunlock(dqp); 232 return dqp; 233 } 234 235 typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq, 236 xfs_dqtype_t type, void *priv); 237 int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type, 238 xfs_qm_dqiterate_fn iter_fn, void *priv); 239 240 #endif /* __XFS_DQUOT_H__ */ 241