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