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 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_load_quota_sb(struct super_block *sb, int type, int format_id,
 101         unsigned int flags);
 102 int dquot_load_quota_inode(struct inode *inode, int type, int format_id,
 103         unsigned int flags);
 104 int dquot_quota_on(struct super_block *sb, int type, int format_id,
 105         const struct path *path);
 106 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
 107         int format_id, int type);
 108 int dquot_quota_off(struct super_block *sb, int type);
 109 int dquot_writeback_dquots(struct super_block *sb, int type);
 110 int dquot_quota_sync(struct super_block *sb, int type);
 111 int dquot_get_state(struct super_block *sb, struct qc_state *state);
 112 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 113 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 114                 struct qc_dqblk *di);
 115 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
 116                 struct qc_dqblk *di);
 117 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
 118                 struct qc_dqblk *di);
 119
 120 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
 121 int dquot_transfer(struct inode *inode, struct iattr *iattr);
 122
 123 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 124 {
 125         return sb_dqopt(sb)->info + type;
 126 }
 127
 128 /*
 129  * Functions for checking status of quota
 130  */
 131
 132 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 133 {
 134         return sb_dqopt(sb)->flags &
 135                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 136 }
 137
 138 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 139 {
 140         return sb_dqopt(sb)->flags &
 141                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 142 }
 143
 144 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 145 {
 146         return sb_dqopt(sb)->flags &
 147                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 148 }
 149
 150 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 151 {
 152         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 153 }
 154
 155 /* Does kernel know about any quota information for given sb + type? */
 156 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 157 {
 158         /* Currently if anything is on, then quota usage is on as well */
 159         return sb_has_quota_usage_enabled(sb, type);
 160 }
 161
 162 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 163 {
 164         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 165 }
 166
 167 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 168 {
 169         return sb_has_quota_loaded(sb, type) &&
 170                !sb_has_quota_suspended(sb, type);
 171 }
 172
 173 /*
 174  * Operations supported for diskquotas.
 175  */
 176 extern const struct dquot_operations dquot_operations;
 177 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 178
 179 #else
 180
 181 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 182 {
 183         return 0;
 184 }
 185
 186 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 187 {
 188         return 0;
 189 }
 190
 191 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 192 {
 193         return 0;
 194 }
 195
 196 static inline int sb_any_quota_suspended(struct super_block *sb)
 197 {
 198         return 0;
 199 }
 200
 201 /* Does kernel know about any quota information for given sb + type? */
 202 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 203 {
 204         return 0;
 205 }
 206
 207 static inline int sb_any_quota_loaded(struct super_block *sb)
 208 {
 209         return 0;
 210 }
 211
 212 static inline int sb_has_quota_active(struct super_block *sb, int type)
 213 {
 214         return 0;
 215 }
 216
 217 static inline int dquot_initialize(struct inode *inode)
 218 {
 219         return 0;
 220 }
 221
 222 static inline bool dquot_initialize_needed(struct inode *inode)
 223 {
 224         return false;
 225 }
 226
 227 static inline void dquot_drop(struct inode *inode)
 228 {
 229 }
 230
 231 static inline int dquot_alloc_inode(struct inode *inode)
 232 {
 233         return 0;
 234 }
 235
 236 static inline void dquot_free_inode(struct inode *inode)
 237 {
 238 }
 239
 240 static inline int dquot_transfer(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 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 261 {
 262         inode_add_bytes(inode, number);
 263         return 0;
 264 }
 265
 266 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 267                                               qsize_t number)
 268 {
 269         inode_sub_bytes(inode, number);
 270         return 0;
 271 }
 272
 273 static inline int dquot_disable(struct super_block *sb, int type,
 274                 unsigned int flags)
 275 {
 276         return 0;
 277 }
 278
 279 static inline int dquot_suspend(struct super_block *sb, int type)
 280 {
 281         return 0;
 282 }
 283
 284 static inline int dquot_resume(struct super_block *sb, int type)
 285 {
 286         return 0;
 287 }
 288
 289 #define dquot_file_open         generic_file_open
 290
 291 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 292 {
 293         return 0;
 294 }
 295
 296 #endif /* CONFIG_QUOTA */
 297
 298 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 299 {
 300         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 301 }
 302
 303 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 304 {
 305         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 306         mark_inode_dirty_sync(inode);
 307 }
 308
 309 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 310 {
 311         int ret;
 312
 313         ret = dquot_alloc_space_nodirty(inode, nr);
 314         if (!ret) {
 315                 /*
 316                  * Mark inode fully dirty. Since we are allocating blocks, inode
 317                  * would become fully dirty soon anyway and it reportedly
 318                  * reduces lock contention.
 319                  */
 320                 mark_inode_dirty(inode);
 321         }
 322         return ret;
 323 }
 324
 325 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 326 {
 327         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 328 }
 329
 330 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 331 {
 332         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 333 }
 334
 335 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 336 {
 337         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 338 }
 339
 340 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 341 {
 342         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 343 }
 344
 345 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 346 {
 347         int ret;
 348
 349         ret = dquot_prealloc_block_nodirty(inode, nr);
 350         if (!ret)
 351                 mark_inode_dirty_sync(inode);
 352         return ret;
 353 }
 354
 355 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 356 {
 357         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 358                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 359 }
 360
 361 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 362 {
 363         int ret;
 364
 365         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 366         if (!ret)
 367                 mark_inode_dirty_sync(inode);
 368         return ret;
 369 }
 370
 371 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 372 {
 373         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 374         mark_inode_dirty_sync(inode);
 375 }
 376
 377 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 378 {
 379         __dquot_free_space(inode, nr, 0);
 380 }
 381
 382 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 383 {
 384         dquot_free_space_nodirty(inode, nr);
 385         mark_inode_dirty_sync(inode);
 386 }
 387
 388 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 389 {
 390         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 391 }
 392
 393 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 394 {
 395         dquot_free_space(inode, nr << inode->i_blkbits);
 396 }
 397
 398 static inline void dquot_release_reservation_block(struct inode *inode,
 399                 qsize_t nr)
 400 {
 401         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 402 }
 403
 404 unsigned int qtype_enforce_flag(int type);
 405
 406 #endif /* _LINUX_QUOTAOPS_ */