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 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  13 {
  14         return &sb->s_dquot;
  15 }
  16
  17 #if defined(CONFIG_QUOTA)
  18
  19 /*
  20  * declaration of quota_function calls in kernel.
  21  */
  22 void sync_quota_sb(struct super_block *sb, int type);
  23 static inline void writeout_quota_sb(struct super_block *sb, int type)
  24 {
  25         if (sb->s_qcop->quota_sync)
  26                 sb->s_qcop->quota_sync(sb, type);
  27 }
  28
  29 void inode_add_rsv_space(struct inode *inode, qsize_t number);
  30 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
  31 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
  32
  33 int dquot_initialize(struct inode *inode, int type);
  34 int dquot_drop(struct inode *inode);
  35 struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
  36 void dqput(struct dquot *dquot);
  37 int dquot_scan_active(struct super_block *sb,
  38                       int (*fn)(struct dquot *dquot, unsigned long priv),
  39                       unsigned long priv);
  40 struct dquot *dquot_alloc(struct super_block *sb, int type);
  41 void dquot_destroy(struct dquot *dquot);
  42
  43 int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  44 int dquot_alloc_inode(const struct inode *inode, qsize_t number);
  45
  46 int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc);
  47 int dquot_claim_space(struct inode *inode, qsize_t number);
  48 void dquot_release_reserved_space(struct inode *inode, qsize_t number);
  49
  50 int dquot_free_space(struct inode *inode, qsize_t number);
  51 int dquot_free_inode(const struct inode *inode, qsize_t number);
  52
  53 int dquot_transfer(struct inode *inode, struct iattr *iattr);
  54 int dquot_commit(struct dquot *dquot);
  55 int dquot_acquire(struct dquot *dquot);
  56 int dquot_release(struct dquot *dquot);
  57 int dquot_commit_info(struct super_block *sb, int type);
  58 int dquot_mark_dquot_dirty(struct dquot *dquot);
  59
  60 int vfs_quota_on(struct super_block *sb, int type, int format_id,
  61         char *path, int remount);
  62 int vfs_quota_enable(struct inode *inode, int type, int format_id,
  63         unsigned int flags);
  64 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
  65         struct path *path);
  66 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  67         int format_id, int type);
  68 int vfs_quota_off(struct super_block *sb, int type, int remount);
  69 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
  70 int vfs_quota_sync(struct super_block *sb, int type);
  71 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  72 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  73 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  74 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  75
  76 void vfs_dq_drop(struct inode *inode);
  77 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
  78 int vfs_dq_quota_on_remount(struct super_block *sb);
  79
  80 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  81 {
  82         return sb_dqopt(sb)->info + type;
  83 }
  84
  85 /*
  86  * Functions for checking status of quota
  87  */
  88
  89 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
  90 {
  91         return sb_dqopt(sb)->flags &
  92                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
  93 }
  94
  95 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
  96 {
  97         return sb_dqopt(sb)->flags &
  98                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
  99 }
 100
 101 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 102 {
 103         return sb_dqopt(sb)->flags &
 104                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 105 }
 106
 107 static inline int sb_any_quota_suspended(struct super_block *sb)
 108 {
 109         return sb_has_quota_suspended(sb, USRQUOTA) ||
 110                 sb_has_quota_suspended(sb, GRPQUOTA);
 111 }
 112
 113 /* Does kernel know about any quota information for given sb + type? */
 114 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 115 {
 116         /* Currently if anything is on, then quota usage is on as well */
 117         return sb_has_quota_usage_enabled(sb, type);
 118 }
 119
 120 static inline int sb_any_quota_loaded(struct super_block *sb)
 121 {
 122         return sb_has_quota_loaded(sb, USRQUOTA) ||
 123                 sb_has_quota_loaded(sb, GRPQUOTA);
 124 }
 125
 126 static inline int sb_has_quota_active(struct super_block *sb, int type)
 127 {
 128         return sb_has_quota_loaded(sb, type) &&
 129                !sb_has_quota_suspended(sb, type);
 130 }
 131
 132 static inline int sb_any_quota_active(struct super_block *sb)
 133 {
 134         return sb_has_quota_active(sb, USRQUOTA) ||
 135                sb_has_quota_active(sb, GRPQUOTA);
 136 }
 137
 138 /*
 139  * Operations supported for diskquotas.
 140  */
 141 extern const struct dquot_operations dquot_operations;
 142 extern const struct quotactl_ops vfs_quotactl_ops;
 143
 144 #define sb_dquot_ops (&dquot_operations)
 145 #define sb_quotactl_ops (&vfs_quotactl_ops)
 146
 147 /* It is better to call this function outside of any transaction as it might
 148  * need a lot of space in journal for dquot structure allocation. */
 149 static inline void vfs_dq_init(struct inode *inode)
 150 {
 151         BUG_ON(!inode->i_sb);
 152         if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode))
 153                 inode->i_sb->dq_op->initialize(inode, -1);
 154 }
 155
 156 /* The following allocation/freeing/transfer functions *must* be called inside
 157  * a transaction (deadlocks possible otherwise) */
 158 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 159 {
 160         if (sb_any_quota_active(inode->i_sb)) {
 161                 /* Used space is updated in alloc_space() */
 162                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
 163                         return 1;
 164         }
 165         else
 166                 inode_add_bytes(inode, nr);
 167         return 0;
 168 }
 169
 170 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 171 {
 172         int ret;
 173         if (!(ret =  vfs_dq_prealloc_space_nodirty(inode, nr)))
 174                 mark_inode_dirty(inode);
 175         return ret;
 176 }
 177
 178 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 179 {
 180         if (sb_any_quota_active(inode->i_sb)) {
 181                 /* Used space is updated in alloc_space() */
 182                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
 183                         return 1;
 184         }
 185         else
 186                 inode_add_bytes(inode, nr);
 187         return 0;
 188 }
 189
 190 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 191 {
 192         int ret;
 193         if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
 194                 mark_inode_dirty(inode);
 195         return ret;
 196 }
 197
 198 static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
 199 {
 200         if (sb_any_quota_active(inode->i_sb)) {
 201                 /* Used space is updated in alloc_space() */
 202                 if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
 203                         return 1;
 204         }
 205         else
 206                 inode_add_rsv_space(inode, nr);
 207         return 0;
 208 }
 209
 210 static inline int vfs_dq_alloc_inode(struct inode *inode)
 211 {
 212         if (sb_any_quota_active(inode->i_sb)) {
 213                 vfs_dq_init(inode);
 214                 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
 215                         return 1;
 216         }
 217         return 0;
 218 }
 219
 220 /*
 221  * Convert in-memory reserved quotas to real consumed quotas
 222  */
 223 static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
 224 {
 225         if (sb_any_quota_active(inode->i_sb)) {
 226                 if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA)
 227                         return 1;
 228         } else
 229                 inode_claim_rsv_space(inode, nr);
 230
 231         mark_inode_dirty(inode);
 232         return 0;
 233 }
 234
 235 /*
 236  * Release reserved (in-memory) quotas
 237  */
 238 static inline
 239 void vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
 240 {
 241         if (sb_any_quota_active(inode->i_sb))
 242                 inode->i_sb->dq_op->release_rsv(inode, nr);
 243         else
 244                 inode_sub_rsv_space(inode, nr);
 245 }
 246
 247 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 248 {
 249         if (sb_any_quota_active(inode->i_sb))
 250                 inode->i_sb->dq_op->free_space(inode, nr);
 251         else
 252                 inode_sub_bytes(inode, nr);
 253 }
 254
 255 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 256 {
 257         vfs_dq_free_space_nodirty(inode, nr);
 258         mark_inode_dirty(inode);
 259 }
 260
 261 static inline void vfs_dq_free_inode(struct inode *inode)
 262 {
 263         if (sb_any_quota_active(inode->i_sb))
 264                 inode->i_sb->dq_op->free_inode(inode, 1);
 265 }
 266
 267 /* Cannot be called inside a transaction */
 268 static inline int vfs_dq_off(struct super_block *sb, int remount)
 269 {
 270         int ret = -ENOSYS;
 271
 272         if (sb->s_qcop && sb->s_qcop->quota_off)
 273                 ret = sb->s_qcop->quota_off(sb, -1, remount);
 274         return ret;
 275 }
 276
 277 #else
 278
 279 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 280 {
 281         return 0;
 282 }
 283
 284 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 285 {
 286         return 0;
 287 }
 288
 289 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 290 {
 291         return 0;
 292 }
 293
 294 static inline int sb_any_quota_suspended(struct super_block *sb)
 295 {
 296         return 0;
 297 }
 298
 299 /* Does kernel know about any quota information for given sb + type? */
 300 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 301 {
 302         return 0;
 303 }
 304
 305 static inline int sb_any_quota_loaded(struct super_block *sb)
 306 {
 307         return 0;
 308 }
 309
 310 static inline int sb_has_quota_active(struct super_block *sb, int type)
 311 {
 312         return 0;
 313 }
 314
 315 static inline int sb_any_quota_active(struct super_block *sb)
 316 {
 317         return 0;
 318 }
 319
 320 /*
 321  * NO-OP when quota not configured.
 322  */
 323 #define sb_dquot_ops                            (NULL)
 324 #define sb_quotactl_ops                         (NULL)
 325
 326 static inline void vfs_dq_init(struct inode *inode)
 327 {
 328 }
 329
 330 static inline void vfs_dq_drop(struct inode *inode)
 331 {
 332 }
 333
 334 static inline int vfs_dq_alloc_inode(struct inode *inode)
 335 {
 336         return 0;
 337 }
 338
 339 static inline void vfs_dq_free_inode(struct inode *inode)
 340 {
 341 }
 342
 343 static inline void sync_quota_sb(struct super_block *sb, int type)
 344 {
 345 }
 346
 347 static inline void writeout_quota_sb(struct super_block *sb, int type)
 348 {
 349 }
 350
 351 static inline int vfs_dq_off(struct super_block *sb, int remount)
 352 {
 353         return 0;
 354 }
 355
 356 static inline int vfs_dq_quota_on_remount(struct super_block *sb)
 357 {
 358         return 0;
 359 }
 360
 361 static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 362 {
 363         return 0;
 364 }
 365
 366 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 367 {
 368         inode_add_bytes(inode, nr);
 369         return 0;
 370 }
 371
 372 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 373 {
 374         vfs_dq_prealloc_space_nodirty(inode, nr);
 375         mark_inode_dirty(inode);
 376         return 0;
 377 }
 378
 379 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 380 {
 381         inode_add_bytes(inode, nr);
 382         return 0;
 383 }
 384
 385 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 386 {
 387         vfs_dq_alloc_space_nodirty(inode, nr);
 388         mark_inode_dirty(inode);
 389         return 0;
 390 }
 391
 392 static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
 393 {
 394         return 0;
 395 }
 396
 397 static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
 398 {
 399         return vfs_dq_alloc_space(inode, nr);
 400 }
 401
 402 static inline
 403 int vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
 404 {
 405         return 0;
 406 }
 407
 408 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 409 {
 410         inode_sub_bytes(inode, nr);
 411 }
 412
 413 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 414 {
 415         vfs_dq_free_space_nodirty(inode, nr);
 416         mark_inode_dirty(inode);
 417 }
 418
 419 #endif /* CONFIG_QUOTA */
 420
 421 static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 422 {
 423         return vfs_dq_prealloc_space_nodirty(inode, nr << inode->i_blkbits);
 424 }
 425
 426 static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
 427 {
 428         return vfs_dq_prealloc_space(inode, nr << inode->i_blkbits);
 429 }
 430
 431 static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 432 {
 433         return vfs_dq_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 434 }
 435
 436 static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
 437 {
 438         return vfs_dq_alloc_space(inode, nr << inode->i_blkbits);
 439 }
 440
 441 static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
 442 {
 443         return vfs_dq_reserve_space(inode, nr << inode->i_blkbits);
 444 }
 445
 446 static inline int vfs_dq_claim_block(struct inode *inode, qsize_t nr)
 447 {
 448         return vfs_dq_claim_space(inode, nr << inode->i_blkbits);
 449 }
 450
 451 static inline
 452 void vfs_dq_release_reservation_block(struct inode *inode, qsize_t nr)
 453 {
 454         vfs_dq_release_reservation_space(inode, nr << inode->i_blkbits);
 455 }
 456
 457 static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
 458 {
 459         vfs_dq_free_space_nodirty(inode, nr << inode->i_blkbits);
 460 }
 461
 462 static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
 463 {
 464         vfs_dq_free_space(inode, nr << inode->i_blkbits);
 465 }
 466
 467 #endif /* _LINUX_QUOTAOPS_ */