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_mark_dquot_dirty(struct dquot *dquot);
  86
  87 int dquot_file_open(struct inode *inode, struct file *file);
  88
  89 int dquot_enable(struct inode *inode, int type, int format_id,
  90         unsigned int flags);
  91 int dquot_quota_on(struct super_block *sb, int type, int format_id,
  92         struct path *path);
  93 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  94         int format_id, int type);
  95 int dquot_quota_off(struct super_block *sb, int type);
  96 int dquot_writeback_dquots(struct super_block *sb, int type);
  97 int dquot_quota_sync(struct super_block *sb, int type);
  98 int dquot_get_state(struct super_block *sb, struct qc_state *state);
  99 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 100 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 101                 struct qc_dqblk *di);
 102 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
 103                 struct qc_dqblk *di);
 104
 105 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
 106 int dquot_transfer(struct inode *inode, struct iattr *iattr);
 107
 108 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 109 {
 110         return sb_dqopt(sb)->info + type;
 111 }
 112
 113 /*
 114  * Functions for checking status of quota
 115  */
 116
 117 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 118 {
 119         return sb_dqopt(sb)->flags &
 120                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 121 }
 122
 123 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 124 {
 125         return sb_dqopt(sb)->flags &
 126                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 127 }
 128
 129 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 130 {
 131         return sb_dqopt(sb)->flags &
 132                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 133 }
 134
 135 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 136 {
 137         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 138 }
 139
 140 /* Does kernel know about any quota information for given sb + type? */
 141 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 142 {
 143         /* Currently if anything is on, then quota usage is on as well */
 144         return sb_has_quota_usage_enabled(sb, type);
 145 }
 146
 147 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 148 {
 149         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 150 }
 151
 152 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 153 {
 154         return sb_has_quota_loaded(sb, type) &&
 155                !sb_has_quota_suspended(sb, type);
 156 }
 157
 158 /*
 159  * Operations supported for diskquotas.
 160  */
 161 extern const struct dquot_operations dquot_operations;
 162 extern const struct quotactl_ops dquot_quotactl_ops;
 163 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 164
 165 #else
 166
 167 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 168 {
 169         return 0;
 170 }
 171
 172 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 173 {
 174         return 0;
 175 }
 176
 177 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 178 {
 179         return 0;
 180 }
 181
 182 static inline int sb_any_quota_suspended(struct super_block *sb)
 183 {
 184         return 0;
 185 }
 186
 187 /* Does kernel know about any quota information for given sb + type? */
 188 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 189 {
 190         return 0;
 191 }
 192
 193 static inline int sb_any_quota_loaded(struct super_block *sb)
 194 {
 195         return 0;
 196 }
 197
 198 static inline int sb_has_quota_active(struct super_block *sb, int type)
 199 {
 200         return 0;
 201 }
 202
 203 static inline int dquot_initialize(struct inode *inode)
 204 {
 205         return 0;
 206 }
 207
 208 static inline void dquot_drop(struct inode *inode)
 209 {
 210 }
 211
 212 static inline int dquot_alloc_inode(struct inode *inode)
 213 {
 214         return 0;
 215 }
 216
 217 static inline void dquot_free_inode(struct inode *inode)
 218 {
 219 }
 220
 221 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 222 {
 223         return 0;
 224 }
 225
 226 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 227                 int flags)
 228 {
 229         if (!(flags & DQUOT_SPACE_RESERVE))
 230                 inode_add_bytes(inode, number);
 231         return 0;
 232 }
 233
 234 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 235                 int flags)
 236 {
 237         if (!(flags & DQUOT_SPACE_RESERVE))
 238                 inode_sub_bytes(inode, number);
 239 }
 240
 241 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 242 {
 243         inode_add_bytes(inode, number);
 244         return 0;
 245 }
 246
 247 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 248                                               qsize_t number)
 249 {
 250         inode_sub_bytes(inode, number);
 251         return 0;
 252 }
 253
 254 static inline int dquot_disable(struct super_block *sb, int type,
 255                 unsigned int flags)
 256 {
 257         return 0;
 258 }
 259
 260 static inline int dquot_suspend(struct super_block *sb, int type)
 261 {
 262         return 0;
 263 }
 264
 265 static inline int dquot_resume(struct super_block *sb, int type)
 266 {
 267         return 0;
 268 }
 269
 270 #define dquot_file_open         generic_file_open
 271
 272 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 273 {
 274         return 0;
 275 }
 276
 277 #endif /* CONFIG_QUOTA */
 278
 279 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 280 {
 281         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 282 }
 283
 284 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 285 {
 286         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 287         mark_inode_dirty_sync(inode);
 288 }
 289
 290 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 291 {
 292         int ret;
 293
 294         ret = dquot_alloc_space_nodirty(inode, nr);
 295         if (!ret) {
 296                 /*
 297                  * Mark inode fully dirty. Since we are allocating blocks, inode
 298                  * would become fully dirty soon anyway and it reportedly
 299                  * reduces lock contention.
 300                  */
 301                 mark_inode_dirty(inode);
 302         }
 303         return ret;
 304 }
 305
 306 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 307 {
 308         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 309 }
 310
 311 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 312 {
 313         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 314 }
 315
 316 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 317 {
 318         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 319 }
 320
 321 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 322 {
 323         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 324 }
 325
 326 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 327 {
 328         int ret;
 329
 330         ret = dquot_prealloc_block_nodirty(inode, nr);
 331         if (!ret)
 332                 mark_inode_dirty_sync(inode);
 333         return ret;
 334 }
 335
 336 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 337 {
 338         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 339                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 340 }
 341
 342 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 343 {
 344         int ret;
 345
 346         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 347         if (!ret)
 348                 mark_inode_dirty_sync(inode);
 349         return ret;
 350 }
 351
 352 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 353 {
 354         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 355         mark_inode_dirty_sync(inode);
 356 }
 357
 358 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 359 {
 360         __dquot_free_space(inode, nr, 0);
 361 }
 362
 363 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 364 {
 365         dquot_free_space_nodirty(inode, nr);
 366         mark_inode_dirty_sync(inode);
 367 }
 368
 369 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 370 {
 371         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 372 }
 373
 374 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 375 {
 376         dquot_free_space(inode, nr << inode->i_blkbits);
 377 }
 378
 379 static inline void dquot_release_reservation_block(struct inode *inode,
 380                 qsize_t nr)
 381 {
 382         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 383 }
 384
 385 unsigned int qtype_enforce_flag(int type);
 386
 387 #endif /* _LINUX_QUOTAOPS_ */