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