root/include/linux/quotaops.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. sb_dqopt
  2. is_quota_modification
  3. __printf
  4. dquot_is_busy
  5. dquot_suspend
  6. sb_dqinfo
  7. sb_has_quota_usage_enabled
  8. sb_has_quota_limits_enabled
  9. sb_has_quota_suspended
  10. sb_any_quota_suspended
  11. sb_has_quota_loaded
  12. sb_any_quota_loaded
  13. sb_has_quota_active
  14. sb_has_quota_usage_enabled
  15. sb_has_quota_limits_enabled
  16. sb_has_quota_suspended
  17. sb_any_quota_suspended
  18. sb_has_quota_loaded
  19. sb_any_quota_loaded
  20. sb_has_quota_active
  21. dquot_initialize
  22. dquot_initialize_needed
  23. dquot_drop
  24. dquot_alloc_inode
  25. dquot_free_inode
  26. dquot_transfer
  27. __dquot_alloc_space
  28. __dquot_free_space
  29. dquot_claim_space_nodirty
  30. dquot_reclaim_space_nodirty
  31. dquot_disable
  32. dquot_suspend
  33. dquot_resume
  34. dquot_writeback_dquots
  35. dquot_alloc_space_nodirty
  36. dquot_alloc_space_nofail
  37. dquot_alloc_space
  38. dquot_alloc_block_nodirty
  39. dquot_alloc_block_nofail
  40. dquot_alloc_block
  41. dquot_prealloc_block_nodirty
  42. dquot_prealloc_block
  43. dquot_reserve_block
  44. dquot_claim_block
  45. dquot_reclaim_block
  46. dquot_free_space_nodirty
  47. dquot_free_space
  48. dquot_free_block_nodirty
  49. dquot_free_block
  50. dquot_release_reservation_block
   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Definitions for diskquota-operations. When diskquota is configured these
   4  * macros expand to the right source-code.
   5  *
   6  * Author:  Marco van Wieringen <mvw@planets.elm.net>
   7  */
   8 #ifndef _LINUX_QUOTAOPS_
   9 #define _LINUX_QUOTAOPS_
  10 
  11 #include <linux/fs.h>
  12 
  13 #define DQUOT_SPACE_WARN        0x1
  14 #define DQUOT_SPACE_RESERVE     0x2
  15 #define DQUOT_SPACE_NOFAIL      0x4
  16 
  17 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  18 {
  19         return &sb->s_dquot;
  20 }
  21 
  22 /* i_mutex must being held */
  23 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
  24 {
  25         return (ia->ia_valid & ATTR_SIZE) ||
  26                 (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
  27                 (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
  28 }
  29 
  30 int kernel_quotactl(unsigned int cmd, const char __user *special,
  31                     qid_t id, void __user *addr);
  32 
  33 #if defined(CONFIG_QUOTA)
  34 
  35 #define quota_error(sb, fmt, args...) \
  36         __quota_error((sb), __func__, fmt , ## args)
  37 
  38 extern __printf(3, 4)
  39 void __quota_error(struct super_block *sb, const char *func,
  40                    const char *fmt, ...);
  41 
  42 /*
  43  * declaration of quota_function calls in kernel.
  44  */
  45 int dquot_initialize(struct inode *inode);
  46 bool dquot_initialize_needed(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 
  58 static inline bool dquot_is_busy(struct dquot *dquot)
  59 {
  60         if (test_bit(DQ_MOD_B, &dquot->dq_flags))
  61                 return true;
  62         if (atomic_read(&dquot->dq_count) > 1)
  63                 return true;
  64         return false;
  65 }
  66 
  67 void dqput(struct dquot *dquot);
  68 int dquot_scan_active(struct super_block *sb,
  69                       int (*fn)(struct dquot *dquot, unsigned long priv),
  70                       unsigned long priv);
  71 struct dquot *dquot_alloc(struct super_block *sb, int type);
  72 void dquot_destroy(struct dquot *dquot);
  73 
  74 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
  75 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
  76 
  77 int dquot_alloc_inode(struct inode *inode);
  78 
  79 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  80 void dquot_free_inode(struct inode *inode);
  81 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
  82 
  83 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  84 /* Suspend quotas on remount RO */
  85 static inline int dquot_suspend(struct super_block *sb, int type)
  86 {
  87         return dquot_disable(sb, type, DQUOT_SUSPENDED);
  88 }
  89 int dquot_resume(struct super_block *sb, int type);
  90 
  91 int dquot_commit(struct dquot *dquot);
  92 int dquot_acquire(struct dquot *dquot);
  93 int dquot_release(struct dquot *dquot);
  94 int dquot_commit_info(struct super_block *sb, int type);
  95 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
  96 int dquot_mark_dquot_dirty(struct dquot *dquot);
  97 
  98 int dquot_file_open(struct inode *inode, struct file *file);
  99 
 100 int dquot_enable(struct inode *inode, int type, int format_id,
 101         unsigned int flags);
 102 int dquot_quota_on(struct super_block *sb, int type, int format_id,
 103         const struct path *path);
 104 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
 105         int format_id, int type);
 106 int dquot_quota_off(struct super_block *sb, int type);
 107 int dquot_writeback_dquots(struct super_block *sb, int type);
 108 int dquot_quota_sync(struct super_block *sb, int type);
 109 int dquot_get_state(struct super_block *sb, struct qc_state *state);
 110 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 111 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 112                 struct qc_dqblk *di);
 113 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
 114                 struct qc_dqblk *di);
 115 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
 116                 struct qc_dqblk *di);
 117 
 118 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
 119 int dquot_transfer(struct inode *inode, struct iattr *iattr);
 120 
 121 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 122 {
 123         return sb_dqopt(sb)->info + type;
 124 }
 125 
 126 /*
 127  * Functions for checking status of quota
 128  */
 129 
 130 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 131 {
 132         return sb_dqopt(sb)->flags &
 133                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 134 }
 135 
 136 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 137 {
 138         return sb_dqopt(sb)->flags &
 139                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 140 }
 141 
 142 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 143 {
 144         return sb_dqopt(sb)->flags &
 145                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 146 }
 147 
 148 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 149 {
 150         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 151 }
 152 
 153 /* Does kernel know about any quota information for given sb + type? */
 154 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 155 {
 156         /* Currently if anything is on, then quota usage is on as well */
 157         return sb_has_quota_usage_enabled(sb, type);
 158 }
 159 
 160 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 161 {
 162         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 163 }
 164 
 165 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 166 {
 167         return sb_has_quota_loaded(sb, type) &&
 168                !sb_has_quota_suspended(sb, type);
 169 }
 170 
 171 /*
 172  * Operations supported for diskquotas.
 173  */
 174 extern const struct dquot_operations dquot_operations;
 175 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 176 
 177 #else
 178 
 179 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 180 {
 181         return 0;
 182 }
 183 
 184 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 185 {
 186         return 0;
 187 }
 188 
 189 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 190 {
 191         return 0;
 192 }
 193 
 194 static inline int sb_any_quota_suspended(struct super_block *sb)
 195 {
 196         return 0;
 197 }
 198 
 199 /* Does kernel know about any quota information for given sb + type? */
 200 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 201 {
 202         return 0;
 203 }
 204 
 205 static inline int sb_any_quota_loaded(struct super_block *sb)
 206 {
 207         return 0;
 208 }
 209 
 210 static inline int sb_has_quota_active(struct super_block *sb, int type)
 211 {
 212         return 0;
 213 }
 214 
 215 static inline int dquot_initialize(struct inode *inode)
 216 {
 217         return 0;
 218 }
 219 
 220 static inline bool dquot_initialize_needed(struct inode *inode)
 221 {
 222         return false;
 223 }
 224 
 225 static inline void dquot_drop(struct inode *inode)
 226 {
 227 }
 228 
 229 static inline int dquot_alloc_inode(struct inode *inode)
 230 {
 231         return 0;
 232 }
 233 
 234 static inline void dquot_free_inode(struct inode *inode)
 235 {
 236 }
 237 
 238 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 239 {
 240         return 0;
 241 }
 242 
 243 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 244                 int flags)
 245 {
 246         if (!(flags & DQUOT_SPACE_RESERVE))
 247                 inode_add_bytes(inode, number);
 248         return 0;
 249 }
 250 
 251 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 252                 int flags)
 253 {
 254         if (!(flags & DQUOT_SPACE_RESERVE))
 255                 inode_sub_bytes(inode, number);
 256 }
 257 
 258 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 259 {
 260         inode_add_bytes(inode, number);
 261         return 0;
 262 }
 263 
 264 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 265                                               qsize_t number)
 266 {
 267         inode_sub_bytes(inode, number);
 268         return 0;
 269 }
 270 
 271 static inline int dquot_disable(struct super_block *sb, int type,
 272                 unsigned int flags)
 273 {
 274         return 0;
 275 }
 276 
 277 static inline int dquot_suspend(struct super_block *sb, int type)
 278 {
 279         return 0;
 280 }
 281 
 282 static inline int dquot_resume(struct super_block *sb, int type)
 283 {
 284         return 0;
 285 }
 286 
 287 #define dquot_file_open         generic_file_open
 288 
 289 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 290 {
 291         return 0;
 292 }
 293 
 294 #endif /* CONFIG_QUOTA */
 295 
 296 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 297 {
 298         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 299 }
 300 
 301 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 302 {
 303         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 304         mark_inode_dirty_sync(inode);
 305 }
 306 
 307 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 308 {
 309         int ret;
 310 
 311         ret = dquot_alloc_space_nodirty(inode, nr);
 312         if (!ret) {
 313                 /*
 314                  * Mark inode fully dirty. Since we are allocating blocks, inode
 315                  * would become fully dirty soon anyway and it reportedly
 316                  * reduces lock contention.
 317                  */
 318                 mark_inode_dirty(inode);
 319         }
 320         return ret;
 321 }
 322 
 323 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 324 {
 325         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 326 }
 327 
 328 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 329 {
 330         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 331 }
 332 
 333 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 334 {
 335         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 336 }
 337 
 338 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 339 {
 340         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 341 }
 342 
 343 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 344 {
 345         int ret;
 346 
 347         ret = dquot_prealloc_block_nodirty(inode, nr);
 348         if (!ret)
 349                 mark_inode_dirty_sync(inode);
 350         return ret;
 351 }
 352 
 353 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 354 {
 355         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 356                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 357 }
 358 
 359 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 360 {
 361         int ret;
 362 
 363         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 364         if (!ret)
 365                 mark_inode_dirty_sync(inode);
 366         return ret;
 367 }
 368 
 369 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 370 {
 371         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 372         mark_inode_dirty_sync(inode);
 373 }
 374 
 375 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 376 {
 377         __dquot_free_space(inode, nr, 0);
 378 }
 379 
 380 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 381 {
 382         dquot_free_space_nodirty(inode, nr);
 383         mark_inode_dirty_sync(inode);
 384 }
 385 
 386 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 387 {
 388         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 389 }
 390 
 391 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 392 {
 393         dquot_free_space(inode, nr << inode->i_blkbits);
 394 }
 395 
 396 static inline void dquot_release_reservation_block(struct inode *inode,
 397                 qsize_t nr)
 398 {
 399         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 400 }
 401 
 402 unsigned int qtype_enforce_flag(int type);
 403 
 404 #endif /* _LINUX_QUOTAOPS_ */
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