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