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 bool dquot_initialize_needed(struct inode *inode);
  48 void dquot_drop(struct inode *inode);
  49 struct dquot *dqget(struct super_block *sb, struct kqid qid);
  50 static inline struct dquot *dqgrab(struct dquot *dquot)
  51 {
  52         /* Make sure someone else has active reference to dquot */
  53         WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
  54         WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
  55         atomic_inc(&dquot->dq_count);
  56         return dquot;
  57 }
  58 void dqput(struct dquot *dquot);
  59 int dquot_scan_active(struct super_block *sb,
  60                       int (*fn)(struct dquot *dquot, unsigned long priv),
  61                       unsigned long priv);
  62 struct dquot *dquot_alloc(struct super_block *sb, int type);
  63 void dquot_destroy(struct dquot *dquot);
  64
  65 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
  66 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
  67
  68 int dquot_alloc_inode(struct inode *inode);
  69
  70 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  71 void dquot_free_inode(struct inode *inode);
  72 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
  73
  74 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  75 /* Suspend quotas on remount RO */
  76 static inline int dquot_suspend(struct super_block *sb, int type)
  77 {
  78         return dquot_disable(sb, type, DQUOT_SUSPENDED);
  79 }
  80 int dquot_resume(struct super_block *sb, int type);
  81
  82 int dquot_commit(struct dquot *dquot);
  83 int dquot_acquire(struct dquot *dquot);
  84 int dquot_release(struct dquot *dquot);
  85 int dquot_commit_info(struct super_block *sb, int type);
  86 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
  87 int dquot_mark_dquot_dirty(struct dquot *dquot);
  88
  89 int dquot_file_open(struct inode *inode, struct file *file);
  90
  91 int dquot_enable(struct inode *inode, int type, int format_id,
  92         unsigned int flags);
  93 int dquot_quota_on(struct super_block *sb, int type, int format_id,
  94         const struct path *path);
  95 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  96         int format_id, int type);
  97 int dquot_quota_off(struct super_block *sb, int type);
  98 int dquot_writeback_dquots(struct super_block *sb, int type);
  99 int dquot_quota_sync(struct super_block *sb, int type);
 100 int dquot_get_state(struct super_block *sb, struct qc_state *state);
 101 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 102 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 103                 struct qc_dqblk *di);
 104 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
 105                 struct qc_dqblk *di);
 106 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
 107                 struct qc_dqblk *di);
 108
 109 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
 110 int dquot_transfer(struct inode *inode, struct iattr *iattr);
 111
 112 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
 113 {
 114         return sb_dqopt(sb)->info + type;
 115 }
 116
 117 /*
 118  * Functions for checking status of quota
 119  */
 120
 121 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
 122 {
 123         return sb_dqopt(sb)->flags &
 124                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 125 }
 126
 127 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 128 {
 129         return sb_dqopt(sb)->flags &
 130                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 131 }
 132
 133 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 134 {
 135         return sb_dqopt(sb)->flags &
 136                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 137 }
 138
 139 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 140 {
 141         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
 142 }
 143
 144 /* Does kernel know about any quota information for given sb + type? */
 145 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 146 {
 147         /* Currently if anything is on, then quota usage is on as well */
 148         return sb_has_quota_usage_enabled(sb, type);
 149 }
 150
 151 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 152 {
 153         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
 154 }
 155
 156 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 157 {
 158         return sb_has_quota_loaded(sb, type) &&
 159                !sb_has_quota_suspended(sb, type);
 160 }
 161
 162 /*
 163  * Operations supported for diskquotas.
 164  */
 165 extern const struct dquot_operations dquot_operations;
 166 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
 167
 168 #else
 169
 170 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 171 {
 172         return 0;
 173 }
 174
 175 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 176 {
 177         return 0;
 178 }
 179
 180 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 181 {
 182         return 0;
 183 }
 184
 185 static inline int sb_any_quota_suspended(struct super_block *sb)
 186 {
 187         return 0;
 188 }
 189
 190 /* Does kernel know about any quota information for given sb + type? */
 191 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 192 {
 193         return 0;
 194 }
 195
 196 static inline int sb_any_quota_loaded(struct super_block *sb)
 197 {
 198         return 0;
 199 }
 200
 201 static inline int sb_has_quota_active(struct super_block *sb, int type)
 202 {
 203         return 0;
 204 }
 205
 206 static inline int dquot_initialize(struct inode *inode)
 207 {
 208         return 0;
 209 }
 210
 211 static inline bool dquot_initialize_needed(struct inode *inode)
 212 {
 213         return false;
 214 }
 215
 216 static inline void dquot_drop(struct inode *inode)
 217 {
 218 }
 219
 220 static inline int dquot_alloc_inode(struct inode *inode)
 221 {
 222         return 0;
 223 }
 224
 225 static inline void dquot_free_inode(struct inode *inode)
 226 {
 227 }
 228
 229 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
 230 {
 231         return 0;
 232 }
 233
 234 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
 235                 int flags)
 236 {
 237         if (!(flags & DQUOT_SPACE_RESERVE))
 238                 inode_add_bytes(inode, number);
 239         return 0;
 240 }
 241
 242 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
 243                 int flags)
 244 {
 245         if (!(flags & DQUOT_SPACE_RESERVE))
 246                 inode_sub_bytes(inode, number);
 247 }
 248
 249 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 250 {
 251         inode_add_bytes(inode, number);
 252         return 0;
 253 }
 254
 255 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
 256                                               qsize_t number)
 257 {
 258         inode_sub_bytes(inode, number);
 259         return 0;
 260 }
 261
 262 static inline int dquot_disable(struct super_block *sb, int type,
 263                 unsigned int flags)
 264 {
 265         return 0;
 266 }
 267
 268 static inline int dquot_suspend(struct super_block *sb, int type)
 269 {
 270         return 0;
 271 }
 272
 273 static inline int dquot_resume(struct super_block *sb, int type)
 274 {
 275         return 0;
 276 }
 277
 278 #define dquot_file_open         generic_file_open
 279
 280 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
 281 {
 282         return 0;
 283 }
 284
 285 #endif /* CONFIG_QUOTA */
 286
 287 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 288 {
 289         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
 290 }
 291
 292 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
 293 {
 294         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
 295         mark_inode_dirty_sync(inode);
 296 }
 297
 298 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 299 {
 300         int ret;
 301
 302         ret = dquot_alloc_space_nodirty(inode, nr);
 303         if (!ret) {
 304                 /*
 305                  * Mark inode fully dirty. Since we are allocating blocks, inode
 306                  * would become fully dirty soon anyway and it reportedly
 307                  * reduces lock contention.
 308                  */
 309                 mark_inode_dirty(inode);
 310         }
 311         return ret;
 312 }
 313
 314 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 315 {
 316         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 317 }
 318
 319 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
 320 {
 321         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
 322 }
 323
 324 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 325 {
 326         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 327 }
 328
 329 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 330 {
 331         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
 332 }
 333
 334 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 335 {
 336         int ret;
 337
 338         ret = dquot_prealloc_block_nodirty(inode, nr);
 339         if (!ret)
 340                 mark_inode_dirty_sync(inode);
 341         return ret;
 342 }
 343
 344 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 345 {
 346         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
 347                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
 348 }
 349
 350 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 351 {
 352         int ret;
 353
 354         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 355         if (!ret)
 356                 mark_inode_dirty_sync(inode);
 357         return ret;
 358 }
 359
 360 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
 361 {
 362         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
 363         mark_inode_dirty_sync(inode);
 364 }
 365
 366 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 367 {
 368         __dquot_free_space(inode, nr, 0);
 369 }
 370
 371 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 372 {
 373         dquot_free_space_nodirty(inode, nr);
 374         mark_inode_dirty_sync(inode);
 375 }
 376
 377 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 378 {
 379         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 380 }
 381
 382 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 383 {
 384         dquot_free_space(inode, nr << inode->i_blkbits);
 385 }
 386
 387 static inline void dquot_release_reservation_block(struct inode *inode,
 388                 qsize_t nr)
 389 {
 390         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
 391 }
 392
 393 unsigned int qtype_enforce_flag(int type);
 394
 395 #endif /* _LINUX_QUOTAOPS_ */