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         const 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_sysfile_ops;
 166
 167 #else
 168
 169 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 170 {
 171         return 0;
 172 }
 173
 174 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 175 {
 176         return 0;
 177 }
 178
 179 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 180 {
 181         return 0;
 182 }
 183
 184 static inline int sb_any_quota_suspended(struct super_block *sb)
 185 {
 186         return 0;
 187 }
 188
 189 /* Does kernel know about any quota information for given sb + type? */
 190 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 191 {
 192         return 0;
 193 }
 194
 195 static inline int sb_any_quota_loaded(struct super_block *sb)
 196 {
 197         return 0;
 198 }
 199
 200 static inline int sb_has_quota_active(struct super_block *sb, int type)
 201 {
 202         return 0;
 203 }
 204
 205 static inline int dquot_initialize(struct inode *inode)
 206 {
 207         return 0;
 208 }
 209
 210 static inline void dquot_drop(struct inode *inode)
 211 {
 212 }
 213
 214 static inline int dquot_alloc_inode(struct inode *inode)
 215 {
 216         return 0;
 217 }
 218
 219 static inline void dquot_free_inode(struct inode *inode)
 220 {
 221 }
 222
 223 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 224 {
 225         return 0;
 226 }
 227
 228 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 229                 int flags)
 230 {
 231         if (!(flags & DQUOT_SPACE_RESERVE))
 232                 inode_add_bytes(inode, number);
 233         return 0;
 234 }
 235
 236 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 237                 int flags)
 238 {
 239         if (!(flags & DQUOT_SPACE_RESERVE))
 240                 inode_sub_bytes(inode, number);
 241 }
 242
 243 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 244 {
 245         inode_add_bytes(inode, number);
 246         return 0;
 247 }
 248
 249 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 250                                               qsize_t number)
 251 {
 252         inode_sub_bytes(inode, number);
 253         return 0;
 254 }
 255
 256 static inline int dquot_disable(struct super_block *sb, int type,
 257                 unsigned int flags)
 258 {
 259         return 0;
 260 }
 261
 262 static inline int dquot_suspend(struct super_block *sb, int type)
 263 {
 264         return 0;
 265 }
 266
 267 static inline int dquot_resume(struct super_block *sb, int type)
 268 {
 269         return 0;
 270 }
 271
 272 #define dquot_file_open         generic_file_open
 273
 274 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 275 {
 276         return 0;
 277 }
 278
 279 #endif /* CONFIG_QUOTA */
 280
 281 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 282 {
 283         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 284 }
 285
 286 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 287 {
 288         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 289         mark_inode_dirty_sync(inode);
 290 }
 291
 292 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 293 {
 294         int ret;
 295
 296         ret = dquot_alloc_space_nodirty(inode, nr);
 297         if (!ret) {
 298                 /*
 299                  * Mark inode fully dirty. Since we are allocating blocks, inode
 300                  * would become fully dirty soon anyway and it reportedly
 301                  * reduces lock contention.
 302                  */
 303                 mark_inode_dirty(inode);
 304         }
 305         return ret;
 306 }
 307
 308 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 309 {
 310         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 311 }
 312
 313 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 314 {
 315         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 316 }
 317
 318 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 319 {
 320         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 321 }
 322
 323 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 324 {
 325         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 326 }
 327
 328 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 329 {
 330         int ret;
 331
 332         ret = dquot_prealloc_block_nodirty(inode, nr);
 333         if (!ret)
 334                 mark_inode_dirty_sync(inode);
 335         return ret;
 336 }
 337
 338 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 339 {
 340         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 341                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 342 }
 343
 344 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 345 {
 346         int ret;
 347
 348         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 349         if (!ret)
 350                 mark_inode_dirty_sync(inode);
 351         return ret;
 352 }
 353
 354 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 355 {
 356         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 357         mark_inode_dirty_sync(inode);
 358 }
 359
 360 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 361 {
 362         __dquot_free_space(inode, nr, 0);
 363 }
 364
 365 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 366 {
 367         dquot_free_space_nodirty(inode, nr);
 368         mark_inode_dirty_sync(inode);
 369 }
 370
 371 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 372 {
 373         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 374 }
 375
 376 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 377 {
 378         dquot_free_space(inode, nr << inode->i_blkbits);
 379 }
 380
 381 static inline void dquot_release_reservation_block(struct inode *inode,
 382                 qsize_t nr)
 383 {
 384         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 385 }
 386
 387 unsigned int qtype_enforce_flag(int type);
 388
 389 #endif /* _LINUX_QUOTAOPS_ */