include/linux/quotaops.h

   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 mnt_idmap *idmap,
  24                                          struct inode *inode, struct iattr *ia)
  25 {
  26         return ((ia->ia_valid & ATTR_SIZE) ||
  27                 i_uid_needs_update(idmap, ia, inode) ||
  28                 i_gid_needs_update(idmap, ia, inode));
  29 }
  30
  31 #if defined(CONFIG_QUOTA)
  32
  33 #define quota_error(sb, fmt, args...) \
  34         __quota_error((sb), __func__, fmt , ## args)
  35
  36 extern __printf(3, 4)
  37 void __quota_error(struct super_block *sb, const char *func,
  38                    const char *fmt, ...);
  39
  40 /*
  41  * declaration of quota_function calls in kernel.
  42  */
  43 int dquot_initialize(struct inode *inode);
  44 bool dquot_initialize_needed(struct inode *inode);
  45 void dquot_drop(struct inode *inode);
  46 struct dquot *dqget(struct super_block *sb, struct kqid qid);
  47 static inline struct dquot *dqgrab(struct dquot *dquot)
  48 {
  49         /* Make sure someone else has active reference to dquot */
  50         WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
  51         WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
  52         atomic_inc(&dquot->dq_count);
  53         return dquot;
  54 }
  55
  56 static inline bool dquot_is_busy(struct dquot *dquot)
  57 {
  58         if (test_bit(DQ_MOD_B, &dquot->dq_flags))
  59                 return true;
  60         if (atomic_read(&dquot->dq_count) > 0)
  61                 return true;
  62         return false;
  63 }
  64
  65 void dqput(struct dquot *dquot);
  66 int dquot_scan_active(struct super_block *sb,
  67                       int (*fn)(struct dquot *dquot, unsigned long priv),
  68                       unsigned long priv);
  69 struct dquot *dquot_alloc(struct super_block *sb, int type);
  70 void dquot_destroy(struct dquot *dquot);
  71
  72 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
  73 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
  74
  75 int dquot_alloc_inode(struct inode *inode);
  76
  77 void dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  78 void dquot_free_inode(struct inode *inode);
  79 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
  80
  81 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  82 /* Suspend quotas on remount RO */
  83 static inline int dquot_suspend(struct super_block *sb, int type)
  84 {
  85         return dquot_disable(sb, type, DQUOT_SUSPENDED);
  86 }
  87 int dquot_resume(struct super_block *sb, int type);
  88
  89 int dquot_commit(struct dquot *dquot);
  90 int dquot_acquire(struct dquot *dquot);
  91 int dquot_release(struct dquot *dquot);
  92 int dquot_commit_info(struct super_block *sb, int type);
  93 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
  94 int dquot_mark_dquot_dirty(struct dquot *dquot);
  95
  96 int dquot_file_open(struct inode *inode, struct file *file);
  97
  98 int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
  99         unsigned int flags);
 100 int dquot_load_quota_inode(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 mnt_idmap *idmap, struct inode *inode,
 120                    struct iattr *iattr);
 121
 122 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 123 {
 124         return sb_dqopt(sb)->info + type;
 125 }
 126
 127 /*
 128  * Functions for checking status of quota
 129  */
 130
 131 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 132 {
 133         return sb_dqopt(sb)->flags &
 134                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 135 }
 136
 137 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 138 {
 139         return sb_dqopt(sb)->flags &
 140                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 141 }
 142
 143 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 144 {
 145         return sb_dqopt(sb)->flags &
 146                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 147 }
 148
 149 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 150 {
 151         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 152 }
 153
 154 /* Does kernel know about any quota information for given sb + type? */
 155 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 156 {
 157         /* Currently if anything is on, then quota usage is on as well */
 158         return sb_has_quota_usage_enabled(sb, type);
 159 }
 160
 161 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 162 {
 163         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 164 }
 165
 166 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 167 {
 168         return sb_has_quota_loaded(sb, type) &&
 169                !sb_has_quota_suspended(sb, type);
 170 }
 171
 172 /*
 173  * Operations supported for diskquotas.
 174  */
 175 extern const struct dquot_operations dquot_operations;
 176 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 177
 178 #else
 179
 180 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 181 {
 182         return 0;
 183 }
 184
 185 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 186 {
 187         return 0;
 188 }
 189
 190 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 191 {
 192         return 0;
 193 }
 194
 195 static inline int sb_any_quota_suspended(struct super_block *sb)
 196 {
 197         return 0;
 198 }
 199
 200 /* Does kernel know about any quota information for given sb + type? */
 201 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 202 {
 203         return 0;
 204 }
 205
 206 static inline int sb_any_quota_loaded(struct super_block *sb)
 207 {
 208         return 0;
 209 }
 210
 211 static inline int sb_has_quota_active(struct super_block *sb, int type)
 212 {
 213         return 0;
 214 }
 215
 216 static inline int dquot_initialize(struct inode *inode)
 217 {
 218         return 0;
 219 }
 220
 221 static inline bool dquot_initialize_needed(struct inode *inode)
 222 {
 223         return false;
 224 }
 225
 226 static inline void dquot_drop(struct inode *inode)
 227 {
 228 }
 229
 230 static inline int dquot_alloc_inode(struct inode *inode)
 231 {
 232         return 0;
 233 }
 234
 235 static inline void dquot_free_inode(struct inode *inode)
 236 {
 237 }
 238
 239 static inline int dquot_transfer(struct mnt_idmap *idmap,
 240                                  struct inode *inode, struct iattr *iattr)
 241 {
 242         return 0;
 243 }
 244
 245 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 246                 int flags)
 247 {
 248         if (!(flags & DQUOT_SPACE_RESERVE))
 249                 inode_add_bytes(inode, number);
 250         return 0;
 251 }
 252
 253 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 254                 int flags)
 255 {
 256         if (!(flags & DQUOT_SPACE_RESERVE))
 257                 inode_sub_bytes(inode, number);
 258 }
 259
 260 static inline void dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 261 {
 262         inode_add_bytes(inode, number);
 263 }
 264
 265 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 266                                               qsize_t number)
 267 {
 268         inode_sub_bytes(inode, number);
 269         return 0;
 270 }
 271
 272 static inline int dquot_disable(struct super_block *sb, int type,
 273                 unsigned int flags)
 274 {
 275         return 0;
 276 }
 277
 278 static inline int dquot_suspend(struct super_block *sb, int type)
 279 {
 280         return 0;
 281 }
 282
 283 static inline int dquot_resume(struct super_block *sb, int type)
 284 {
 285         return 0;
 286 }
 287
 288 #define dquot_file_open         generic_file_open
 289
 290 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 291 {
 292         return 0;
 293 }
 294
 295 #endif /* CONFIG_QUOTA */
 296
 297 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 298 {
 299         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 300 }
 301
 302 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 303 {
 304         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 305         mark_inode_dirty_sync(inode);
 306 }
 307
 308 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 309 {
 310         int ret;
 311
 312         ret = dquot_alloc_space_nodirty(inode, nr);
 313         if (!ret) {
 314                 /*
 315                  * Mark inode fully dirty. Since we are allocating blocks, inode
 316                  * would become fully dirty soon anyway and it reportedly
 317                  * reduces lock contention.
 318                  */
 319                 mark_inode_dirty(inode);
 320         }
 321         return ret;
 322 }
 323
 324 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 325 {
 326         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 327 }
 328
 329 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 330 {
 331         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 332 }
 333
 334 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 335 {
 336         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 337 }
 338
 339 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 340 {
 341         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 342 }
 343
 344 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 345 {
 346         int ret;
 347
 348         ret = dquot_prealloc_block_nodirty(inode, nr);
 349         if (!ret)
 350                 mark_inode_dirty_sync(inode);
 351         return ret;
 352 }
 353
 354 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 355 {
 356         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 357                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 358 }
 359
 360 static inline void dquot_claim_block(struct inode *inode, qsize_t nr)
 361 {
 362         dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 363         mark_inode_dirty_sync(inode);
 364 }
 365
 366 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 367 {
 368         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 369         mark_inode_dirty_sync(inode);
 370 }
 371
 372 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 373 {
 374         __dquot_free_space(inode, nr, 0);
 375 }
 376
 377 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 378 {
 379         dquot_free_space_nodirty(inode, nr);
 380         mark_inode_dirty_sync(inode);
 381 }
 382
 383 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 384 {
 385         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 386 }
 387
 388 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 389 {
 390         dquot_free_space(inode, nr << inode->i_blkbits);
 391 }
 392
 393 static inline void dquot_release_reservation_block(struct inode *inode,
 394                 qsize_t nr)
 395 {
 396         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 397 }
 398
 399 unsigned int qtype_enforce_flag(int type);
 400
 401 #endif /* _LINUX_QUOTAOPS_ */