include/linux/quotaops.h

   1 /*
   2  * Definitions for diskquota-operations. When diskquota is configured these
   3  * macros expand to the right source-code.
   4  *
   5  * Author:  Marco van Wieringen <mvw@planets.elm.net>
   6  */
   7 #ifndef _LINUX_QUOTAOPS_
   8 #define _LINUX_QUOTAOPS_
   9
  10 #include <linux/fs.h>
  11
  12 #define DQUOT_SPACE_WARN        0x1
  13 #define DQUOT_SPACE_RESERVE     0x2
  14 #define DQUOT_SPACE_NOFAIL      0x4
  15
  16 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  17 {
  18         return &sb->s_dquot;
  19 }
  20
  21 /* i_mutex must being held */
  22 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
  23 {
  24         return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
  25                 (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
  26                 (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
  27 }
  28
  29 #if defined(CONFIG_QUOTA)
  30
  31 #define quota_error(sb, fmt, args...) \
  32         __quota_error((sb), __func__, fmt , ## args)
  33
  34 extern __printf(3, 4)
  35 void __quota_error(struct super_block *sb, const char *func,
  36                    const char *fmt, ...);
  37
  38 /*
  39  * declaration of quota_function calls in kernel.
  40  */
  41 void inode_add_rsv_space(struct inode *inode, qsize_t number);
  42 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
  43 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
  44 void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
  45
  46 int dquot_initialize(struct inode *inode);
  47 void dquot_drop(struct inode *inode);
  48 struct dquot *dqget(struct super_block *sb, struct kqid qid);
  49 static inline struct dquot *dqgrab(struct dquot *dquot)
  50 {
  51         /* Make sure someone else has active reference to dquot */
  52         WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
  53         WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
  54         atomic_inc(&dquot->dq_count);
  55         return dquot;
  56 }
  57 void dqput(struct dquot *dquot);
  58 int dquot_scan_active(struct super_block *sb,
  59                       int (*fn)(struct dquot *dquot, unsigned long priv),
  60                       unsigned long priv);
  61 struct dquot *dquot_alloc(struct super_block *sb, int type);
  62 void dquot_destroy(struct dquot *dquot);
  63
  64 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
  65 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
  66
  67 int dquot_alloc_inode(struct inode *inode);
  68
  69 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  70 void dquot_free_inode(struct inode *inode);
  71 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
  72
  73 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  74 /* Suspend quotas on remount RO */
  75 static inline int dquot_suspend(struct super_block *sb, int type)
  76 {
  77         return dquot_disable(sb, type, DQUOT_SUSPENDED);
  78 }
  79 int dquot_resume(struct super_block *sb, int type);
  80
  81 int dquot_commit(struct dquot *dquot);
  82 int dquot_acquire(struct dquot *dquot);
  83 int dquot_release(struct dquot *dquot);
  84 int dquot_commit_info(struct super_block *sb, int type);
  85 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
  86 int dquot_mark_dquot_dirty(struct dquot *dquot);
  87
  88 int dquot_file_open(struct inode *inode, struct file *file);
  89
  90 int dquot_enable(struct inode *inode, int type, int format_id,
  91         unsigned int flags);
  92 int dquot_quota_on(struct super_block *sb, int type, int format_id,
  93         struct path *path);
  94 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  95         int format_id, int type);
  96 int dquot_quota_off(struct super_block *sb, int type);
  97 int dquot_writeback_dquots(struct super_block *sb, int type);
  98 int dquot_quota_sync(struct super_block *sb, int type);
  99 int dquot_get_state(struct super_block *sb, struct qc_state *state);
 100 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 101 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 102                 struct qc_dqblk *di);
 103 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
 104                 struct qc_dqblk *di);
 105 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
 106                 struct qc_dqblk *di);
 107
 108 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
 109 int dquot_transfer(struct inode *inode, struct iattr *iattr);
 110
 111 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 112 {
 113         return sb_dqopt(sb)->info + type;
 114 }
 115
 116 /*
 117  * Functions for checking status of quota
 118  */
 119
 120 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 121 {
 122         return sb_dqopt(sb)->flags &
 123                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 124 }
 125
 126 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 127 {
 128         return sb_dqopt(sb)->flags &
 129                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 130 }
 131
 132 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 133 {
 134         return sb_dqopt(sb)->flags &
 135                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 136 }
 137
 138 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 139 {
 140         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 141 }
 142
 143 /* Does kernel know about any quota information for given sb + type? */
 144 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 145 {
 146         /* Currently if anything is on, then quota usage is on as well */
 147         return sb_has_quota_usage_enabled(sb, type);
 148 }
 149
 150 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 151 {
 152         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 153 }
 154
 155 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 156 {
 157         return sb_has_quota_loaded(sb, type) &&
 158                !sb_has_quota_suspended(sb, type);
 159 }
 160
 161 /*
 162  * Operations supported for diskquotas.
 163  */
 164 extern const struct dquot_operations dquot_operations;
 165 extern const struct quotactl_ops dquot_quotactl_ops;
 166 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 167
 168 #else
 169
 170 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 171 {
 172         return 0;
 173 }
 174
 175 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 176 {
 177         return 0;
 178 }
 179
 180 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 181 {
 182         return 0;
 183 }
 184
 185 static inline int sb_any_quota_suspended(struct super_block *sb)
 186 {
 187         return 0;
 188 }
 189
 190 /* Does kernel know about any quota information for given sb + type? */
 191 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 192 {
 193         return 0;
 194 }
 195
 196 static inline int sb_any_quota_loaded(struct super_block *sb)
 197 {
 198         return 0;
 199 }
 200
 201 static inline int sb_has_quota_active(struct super_block *sb, int type)
 202 {
 203         return 0;
 204 }
 205
 206 static inline int dquot_initialize(struct inode *inode)
 207 {
 208         return 0;
 209 }
 210
 211 static inline void dquot_drop(struct inode *inode)
 212 {
 213 }
 214
 215 static inline int dquot_alloc_inode(struct inode *inode)
 216 {
 217         return 0;
 218 }
 219
 220 static inline void dquot_free_inode(struct inode *inode)
 221 {
 222 }
 223
 224 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 225 {
 226         return 0;
 227 }
 228
 229 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 230                 int flags)
 231 {
 232         if (!(flags & DQUOT_SPACE_RESERVE))
 233                 inode_add_bytes(inode, number);
 234         return 0;
 235 }
 236
 237 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 238                 int flags)
 239 {
 240         if (!(flags & DQUOT_SPACE_RESERVE))
 241                 inode_sub_bytes(inode, number);
 242 }
 243
 244 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 245 {
 246         inode_add_bytes(inode, number);
 247         return 0;
 248 }
 249
 250 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 251                                               qsize_t number)
 252 {
 253         inode_sub_bytes(inode, number);
 254         return 0;
 255 }
 256
 257 static inline int dquot_disable(struct super_block *sb, int type,
 258                 unsigned int flags)
 259 {
 260         return 0;
 261 }
 262
 263 static inline int dquot_suspend(struct super_block *sb, int type)
 264 {
 265         return 0;
 266 }
 267
 268 static inline int dquot_resume(struct super_block *sb, int type)
 269 {
 270         return 0;
 271 }
 272
 273 #define dquot_file_open         generic_file_open
 274
 275 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 276 {
 277         return 0;
 278 }
 279
 280 #endif /* CONFIG_QUOTA */
 281
 282 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 283 {
 284         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 285 }
 286
 287 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 288 {
 289         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 290         mark_inode_dirty_sync(inode);
 291 }
 292
 293 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 294 {
 295         int ret;
 296
 297         ret = dquot_alloc_space_nodirty(inode, nr);
 298         if (!ret) {
 299                 /*
 300                  * Mark inode fully dirty. Since we are allocating blocks, inode
 301                  * would become fully dirty soon anyway and it reportedly
 302                  * reduces lock contention.
 303                  */
 304                 mark_inode_dirty(inode);
 305         }
 306         return ret;
 307 }
 308
 309 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 310 {
 311         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 312 }
 313
 314 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 315 {
 316         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 317 }
 318
 319 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 320 {
 321         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 322 }
 323
 324 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 325 {
 326         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 327 }
 328
 329 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 330 {
 331         int ret;
 332
 333         ret = dquot_prealloc_block_nodirty(inode, nr);
 334         if (!ret)
 335                 mark_inode_dirty_sync(inode);
 336         return ret;
 337 }
 338
 339 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 340 {
 341         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 342                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 343 }
 344
 345 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 346 {
 347         int ret;
 348
 349         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 350         if (!ret)
 351                 mark_inode_dirty_sync(inode);
 352         return ret;
 353 }
 354
 355 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 356 {
 357         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 358         mark_inode_dirty_sync(inode);
 359 }
 360
 361 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 362 {
 363         __dquot_free_space(inode, nr, 0);
 364 }
 365
 366 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 367 {
 368         dquot_free_space_nodirty(inode, nr);
 369         mark_inode_dirty_sync(inode);
 370 }
 371
 372 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 373 {
 374         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 375 }
 376
 377 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 378 {
 379         dquot_free_space(inode, nr << inode->i_blkbits);
 380 }
 381
 382 static inline void dquot_release_reservation_block(struct inode *inode,
 383                 qsize_t nr)
 384 {
 385         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 386 }
 387
 388 unsigned int qtype_enforce_flag(int type);
 389
 390 #endif /* _LINUX_QUOTAOPS_ */