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 && ia->ia_size != inode->i_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 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 bool dquot_initialize_needed(struct inode *inode)
 211 {
 212         return false;
 213 }
 214
 215 static inline void dquot_drop(struct inode *inode)
 216 {
 217 }
 218
 219 static inline int dquot_alloc_inode(struct inode *inode)
 220 {
 221         return 0;
 222 }
 223
 224 static inline void dquot_free_inode(struct inode *inode)
 225 {
 226 }
 227
 228 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 229 {
 230         return 0;
 231 }
 232
 233 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 234                 int flags)
 235 {
 236         if (!(flags & DQUOT_SPACE_RESERVE))
 237                 inode_add_bytes(inode, number);
 238         return 0;
 239 }
 240
 241 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 242                 int flags)
 243 {
 244         if (!(flags & DQUOT_SPACE_RESERVE))
 245                 inode_sub_bytes(inode, number);
 246 }
 247
 248 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 249 {
 250         inode_add_bytes(inode, number);
 251         return 0;
 252 }
 253
 254 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 255                                               qsize_t number)
 256 {
 257         inode_sub_bytes(inode, number);
 258         return 0;
 259 }
 260
 261 static inline int dquot_disable(struct super_block *sb, int type,
 262                 unsigned int flags)
 263 {
 264         return 0;
 265 }
 266
 267 static inline int dquot_suspend(struct super_block *sb, int type)
 268 {
 269         return 0;
 270 }
 271
 272 static inline int dquot_resume(struct super_block *sb, int type)
 273 {
 274         return 0;
 275 }
 276
 277 #define dquot_file_open         generic_file_open
 278
 279 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 280 {
 281         return 0;
 282 }
 283
 284 #endif /* CONFIG_QUOTA */
 285
 286 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 287 {
 288         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 289 }
 290
 291 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 292 {
 293         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 294         mark_inode_dirty_sync(inode);
 295 }
 296
 297 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 298 {
 299         int ret;
 300
 301         ret = dquot_alloc_space_nodirty(inode, nr);
 302         if (!ret) {
 303                 /*
 304                  * Mark inode fully dirty. Since we are allocating blocks, inode
 305                  * would become fully dirty soon anyway and it reportedly
 306                  * reduces lock contention.
 307                  */
 308                 mark_inode_dirty(inode);
 309         }
 310         return ret;
 311 }
 312
 313 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 314 {
 315         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 316 }
 317
 318 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 319 {
 320         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 321 }
 322
 323 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 324 {
 325         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 326 }
 327
 328 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 329 {
 330         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 331 }
 332
 333 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 334 {
 335         int ret;
 336
 337         ret = dquot_prealloc_block_nodirty(inode, nr);
 338         if (!ret)
 339                 mark_inode_dirty_sync(inode);
 340         return ret;
 341 }
 342
 343 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 344 {
 345         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 346                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 347 }
 348
 349 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 350 {
 351         int ret;
 352
 353         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 354         if (!ret)
 355                 mark_inode_dirty_sync(inode);
 356         return ret;
 357 }
 358
 359 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 360 {
 361         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 362         mark_inode_dirty_sync(inode);
 363 }
 364
 365 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 366 {
 367         __dquot_free_space(inode, nr, 0);
 368 }
 369
 370 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 371 {
 372         dquot_free_space_nodirty(inode, nr);
 373         mark_inode_dirty_sync(inode);
 374 }
 375
 376 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 377 {
 378         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 379 }
 380
 381 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 382 {
 383         dquot_free_space(inode, nr << inode->i_blkbits);
 384 }
 385
 386 static inline void dquot_release_reservation_block(struct inode *inode,
 387                 qsize_t nr)
 388 {
 389         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 390 }
 391
 392 unsigned int qtype_enforce_flag(int type);
 393
 394 #endif /* _LINUX_QUOTAOPS_ */