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/smp_lock.h>
  11 #include <linux/fs.h>
  12
  13 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  14 {
  15         return &sb->s_dquot;
  16 }
  17
  18 #if defined(CONFIG_QUOTA)
  19
  20 /*
  21  * declaration of quota_function calls in kernel.
  22  */
  23 void sync_dquots(struct super_block *sb, int type);
  24
  25 int dquot_initialize(struct inode *inode, int type);
  26 int dquot_drop(struct inode *inode);
  27 int dquot_drop_locked(struct inode *inode);
  28 struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
  29 void dqput(struct dquot *dquot);
  30 int dquot_is_cached(struct super_block *sb, unsigned int id, int type);
  31 int dquot_scan_active(struct super_block *sb,
  32                       int (*fn)(struct dquot *dquot, unsigned long priv),
  33                       unsigned long priv);
  34 struct dquot *dquot_alloc(struct super_block *sb, int type);
  35 void dquot_destroy(struct dquot *dquot);
  36
  37 int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  38 int dquot_alloc_inode(const struct inode *inode, qsize_t number);
  39
  40 int dquot_free_space(struct inode *inode, qsize_t number);
  41 int dquot_free_inode(const struct inode *inode, qsize_t number);
  42
  43 int dquot_transfer(struct inode *inode, struct iattr *iattr);
  44 int dquot_commit(struct dquot *dquot);
  45 int dquot_acquire(struct dquot *dquot);
  46 int dquot_release(struct dquot *dquot);
  47 int dquot_commit_info(struct super_block *sb, int type);
  48 int dquot_mark_dquot_dirty(struct dquot *dquot);
  49
  50 int vfs_quota_on(struct super_block *sb, int type, int format_id,
  51         char *path, int remount);
  52 int vfs_quota_enable(struct inode *inode, int type, int format_id,
  53         unsigned int flags);
  54 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
  55         struct path *path);
  56 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  57         int format_id, int type);
  58 int vfs_quota_off(struct super_block *sb, int type, int remount);
  59 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
  60 int vfs_quota_sync(struct super_block *sb, int type);
  61 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  62 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  63 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  64 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  65
  66 void vfs_dq_drop(struct inode *inode);
  67 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
  68 int vfs_dq_quota_on_remount(struct super_block *sb);
  69
  70 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  71 {
  72         return sb_dqopt(sb)->info + type;
  73 }
  74
  75 /*
  76  * Functions for checking status of quota
  77  */
  78
  79 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
  80 {
  81         return sb_dqopt(sb)->flags &
  82                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
  83 }
  84
  85 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
  86 {
  87         return sb_dqopt(sb)->flags &
  88                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
  89 }
  90
  91 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
  92 {
  93         return sb_dqopt(sb)->flags &
  94                                 dquot_state_flag(DQUOT_SUSPENDED, type);
  95 }
  96
  97 static inline int sb_any_quota_suspended(struct super_block *sb)
  98 {
  99         return sb_has_quota_suspended(sb, USRQUOTA) ||
 100                 sb_has_quota_suspended(sb, GRPQUOTA);
 101 }
 102
 103 /* Does kernel know about any quota information for given sb + type? */
 104 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 105 {
 106         /* Currently if anything is on, then quota usage is on as well */
 107         return sb_has_quota_usage_enabled(sb, type);
 108 }
 109
 110 static inline int sb_any_quota_loaded(struct super_block *sb)
 111 {
 112         return sb_has_quota_loaded(sb, USRQUOTA) ||
 113                 sb_has_quota_loaded(sb, GRPQUOTA);
 114 }
 115
 116 static inline int sb_has_quota_active(struct super_block *sb, int type)
 117 {
 118         return sb_has_quota_loaded(sb, type) &&
 119                !sb_has_quota_suspended(sb, type);
 120 }
 121
 122 static inline int sb_any_quota_active(struct super_block *sb)
 123 {
 124         return sb_has_quota_active(sb, USRQUOTA) ||
 125                sb_has_quota_active(sb, GRPQUOTA);
 126 }
 127
 128 /*
 129  * Operations supported for diskquotas.
 130  */
 131 extern struct dquot_operations dquot_operations;
 132 extern struct quotactl_ops vfs_quotactl_ops;
 133
 134 #define sb_dquot_ops (&dquot_operations)
 135 #define sb_quotactl_ops (&vfs_quotactl_ops)
 136
 137 /* It is better to call this function outside of any transaction as it might
 138  * need a lot of space in journal for dquot structure allocation. */
 139 static inline void vfs_dq_init(struct inode *inode)
 140 {
 141         BUG_ON(!inode->i_sb);
 142         if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode))
 143                 inode->i_sb->dq_op->initialize(inode, -1);
 144 }
 145
 146 /* The following allocation/freeing/transfer functions *must* be called inside
 147  * a transaction (deadlocks possible otherwise) */
 148 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 149 {
 150         if (sb_any_quota_active(inode->i_sb)) {
 151                 /* Used space is updated in alloc_space() */
 152                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
 153                         return 1;
 154         }
 155         else
 156                 inode_add_bytes(inode, nr);
 157         return 0;
 158 }
 159
 160 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 161 {
 162         int ret;
 163         if (!(ret =  vfs_dq_prealloc_space_nodirty(inode, nr)))
 164                 mark_inode_dirty(inode);
 165         return ret;
 166 }
 167
 168 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 169 {
 170         if (sb_any_quota_active(inode->i_sb)) {
 171                 /* Used space is updated in alloc_space() */
 172                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
 173                         return 1;
 174         }
 175         else
 176                 inode_add_bytes(inode, nr);
 177         return 0;
 178 }
 179
 180 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 181 {
 182         int ret;
 183         if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
 184                 mark_inode_dirty(inode);
 185         return ret;
 186 }
 187
 188 static inline int vfs_dq_alloc_inode(struct inode *inode)
 189 {
 190         if (sb_any_quota_active(inode->i_sb)) {
 191                 vfs_dq_init(inode);
 192                 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
 193                         return 1;
 194         }
 195         return 0;
 196 }
 197
 198 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 199 {
 200         if (sb_any_quota_active(inode->i_sb))
 201                 inode->i_sb->dq_op->free_space(inode, nr);
 202         else
 203                 inode_sub_bytes(inode, nr);
 204 }
 205
 206 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 207 {
 208         vfs_dq_free_space_nodirty(inode, nr);
 209         mark_inode_dirty(inode);
 210 }
 211
 212 static inline void vfs_dq_free_inode(struct inode *inode)
 213 {
 214         if (sb_any_quota_active(inode->i_sb))
 215                 inode->i_sb->dq_op->free_inode(inode, 1);
 216 }
 217
 218 /* The following two functions cannot be called inside a transaction */
 219 static inline void vfs_dq_sync(struct super_block *sb)
 220 {
 221         sync_dquots(sb, -1);
 222 }
 223
 224 static inline int vfs_dq_off(struct super_block *sb, int remount)
 225 {
 226         int ret = -ENOSYS;
 227
 228         if (sb->s_qcop && sb->s_qcop->quota_off)
 229                 ret = sb->s_qcop->quota_off(sb, -1, remount);
 230         return ret;
 231 }
 232
 233 #else
 234
 235 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 236 {
 237         return 0;
 238 }
 239
 240 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 241 {
 242         return 0;
 243 }
 244
 245 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 246 {
 247         return 0;
 248 }
 249
 250 static inline int sb_any_quota_suspended(struct super_block *sb)
 251 {
 252         return 0;
 253 }
 254
 255 /* Does kernel know about any quota information for given sb + type? */
 256 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 257 {
 258         return 0;
 259 }
 260
 261 static inline int sb_any_quota_loaded(struct super_block *sb)
 262 {
 263         return 0;
 264 }
 265
 266 static inline int sb_has_quota_active(struct super_block *sb, int type)
 267 {
 268         return 0;
 269 }
 270
 271 static inline int sb_any_quota_active(struct super_block *sb)
 272 {
 273         return 0;
 274 }
 275
 276 /*
 277  * NO-OP when quota not configured.
 278  */
 279 #define sb_dquot_ops                            (NULL)
 280 #define sb_quotactl_ops                         (NULL)
 281
 282 static inline void vfs_dq_init(struct inode *inode)
 283 {
 284 }
 285
 286 static inline void vfs_dq_drop(struct inode *inode)
 287 {
 288 }
 289
 290 static inline int vfs_dq_alloc_inode(struct inode *inode)
 291 {
 292         return 0;
 293 }
 294
 295 static inline void vfs_dq_free_inode(struct inode *inode)
 296 {
 297 }
 298
 299 static inline void vfs_dq_sync(struct super_block *sb)
 300 {
 301 }
 302
 303 static inline int vfs_dq_off(struct super_block *sb, int remount)
 304 {
 305         return 0;
 306 }
 307
 308 static inline int vfs_dq_quota_on_remount(struct super_block *sb)
 309 {
 310         return 0;
 311 }
 312
 313 static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 314 {
 315         return 0;
 316 }
 317
 318 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 319 {
 320         inode_add_bytes(inode, nr);
 321         return 0;
 322 }
 323
 324 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 325 {
 326         vfs_dq_prealloc_space_nodirty(inode, nr);
 327         mark_inode_dirty(inode);
 328         return 0;
 329 }
 330
 331 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 332 {
 333         inode_add_bytes(inode, nr);
 334         return 0;
 335 }
 336
 337 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 338 {
 339         vfs_dq_alloc_space_nodirty(inode, nr);
 340         mark_inode_dirty(inode);
 341         return 0;
 342 }
 343
 344 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 345 {
 346         inode_sub_bytes(inode, nr);
 347 }
 348
 349 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 350 {
 351         vfs_dq_free_space_nodirty(inode, nr);
 352         mark_inode_dirty(inode);
 353 }
 354
 355 #endif /* CONFIG_QUOTA */
 356
 357 static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 358 {
 359         return vfs_dq_prealloc_space_nodirty(inode,
 360                         nr << inode->i_sb->s_blocksize_bits);
 361 }
 362
 363 static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
 364 {
 365         return vfs_dq_prealloc_space(inode,
 366                         nr << inode->i_sb->s_blocksize_bits);
 367 }
 368
 369 static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 370 {
 371         return vfs_dq_alloc_space_nodirty(inode,
 372                         nr << inode->i_sb->s_blocksize_bits);
 373 }
 374
 375 static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
 376 {
 377         return vfs_dq_alloc_space(inode,
 378                         nr << inode->i_sb->s_blocksize_bits);
 379 }
 380
 381 static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
 382 {
 383         vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
 384 }
 385
 386 static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
 387 {
 388         vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
 389 }
 390
 391 /*
 392  * Define uppercase equivalents for compatibility with old function names
 393  * Can go away when we think all users have been converted (15/04/2008)
 394  */
 395 #define DQUOT_INIT(inode) vfs_dq_init(inode)
 396 #define DQUOT_DROP(inode) vfs_dq_drop(inode)
 397 #define DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr) \
 398                                 vfs_dq_prealloc_space_nodirty(inode, nr)
 399 #define DQUOT_PREALLOC_SPACE(inode, nr) vfs_dq_prealloc_space(inode, nr)
 400 #define DQUOT_ALLOC_SPACE_NODIRTY(inode, nr) \
 401                                 vfs_dq_alloc_space_nodirty(inode, nr)
 402 #define DQUOT_ALLOC_SPACE(inode, nr) vfs_dq_alloc_space(inode, nr)
 403 #define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) \
 404                                 vfs_dq_prealloc_block_nodirty(inode, nr)
 405 #define DQUOT_PREALLOC_BLOCK(inode, nr) vfs_dq_prealloc_block(inode, nr)
 406 #define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) \
 407                                 vfs_dq_alloc_block_nodirty(inode, nr)
 408 #define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr)
 409 #define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode)
 410 #define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \
 411                                 vfs_dq_free_space_nodirty(inode, nr)
 412 #define DQUOT_FREE_SPACE(inode, nr) vfs_dq_free_space(inode, nr)
 413 #define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) \
 414                                 vfs_dq_free_block_nodirty(inode, nr)
 415 #define DQUOT_FREE_BLOCK(inode, nr) vfs_dq_free_block(inode, nr)
 416 #define DQUOT_FREE_INODE(inode) vfs_dq_free_inode(inode)
 417 #define DQUOT_TRANSFER(inode, iattr) vfs_dq_transfer(inode, iattr)
 418 #define DQUOT_SYNC(sb) vfs_dq_sync(sb)
 419 #define DQUOT_OFF(sb, remount) vfs_dq_off(sb, remount)
 420 #define DQUOT_ON_REMOUNT(sb) vfs_dq_quota_on_remount(sb)
 421
 422 #endif /* _LINUX_QUOTAOPS_ */