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