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 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  13 {
  14         return &sb->s_dquot;
  15 }
  16
  17 /* i_mutex must being held */
  18 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
  19 {
  20         return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
  21                 (ia->ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
  22                 (ia->ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid);
  23 }
  24
  25 #if defined(CONFIG_QUOTA)
  26
  27 /*
  28  * declaration of quota_function calls in kernel.
  29  */
  30 void inode_add_rsv_space(struct inode *inode, qsize_t number);
  31 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
  32 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
  33
  34 void dquot_initialize(struct inode *inode);
  35 void dquot_drop(struct inode *inode);
  36 struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
  37 void dqput(struct dquot *dquot);
  38 int dquot_scan_active(struct super_block *sb,
  39                       int (*fn)(struct dquot *dquot, unsigned long priv),
  40                       unsigned long priv);
  41 struct dquot *dquot_alloc(struct super_block *sb, int type);
  42 void dquot_destroy(struct dquot *dquot);
  43
  44 int __dquot_alloc_space(struct inode *inode, qsize_t number,
  45                 int warn, int reserve);
  46 void __dquot_free_space(struct inode *inode, qsize_t number, int reserve);
  47
  48 int dquot_alloc_inode(const struct inode *inode);
  49
  50 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  51 void dquot_free_inode(const struct inode *inode);
  52
  53 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  54 /* Suspend quotas on remount RO */
  55 static inline int dquot_suspend(struct super_block *sb, int type)
  56 {
  57         return dquot_disable(sb, type, DQUOT_SUSPENDED);
  58 }
  59 int dquot_resume(struct super_block *sb, int type);
  60
  61 int dquot_commit(struct dquot *dquot);
  62 int dquot_acquire(struct dquot *dquot);
  63 int dquot_release(struct dquot *dquot);
  64 int dquot_commit_info(struct super_block *sb, int type);
  65 int dquot_mark_dquot_dirty(struct dquot *dquot);
  66
  67 int dquot_file_open(struct inode *inode, struct file *file);
  68
  69 int dquot_quota_on(struct super_block *sb, int type, int format_id,
  70         char *path);
  71 int dquot_enable(struct inode *inode, int type, int format_id,
  72         unsigned int flags);
  73 int dquot_quota_on_path(struct super_block *sb, int type, int format_id,
  74         struct path *path);
  75 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  76         int format_id, int type);
  77 int dquot_quota_off(struct super_block *sb, int type);
  78 int dquot_quota_sync(struct super_block *sb, int type, int wait);
  79 int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  80 int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  81 int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
  82                 struct fs_disk_quota *di);
  83 int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
  84                 struct fs_disk_quota *di);
  85
  86 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
  87 int dquot_transfer(struct inode *inode, struct iattr *iattr);
  88
  89 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  90 {
  91         return sb_dqopt(sb)->info + type;
  92 }
  93
  94 /*
  95  * Functions for checking status of quota
  96  */
  97
  98 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
  99 {
 100         return sb_dqopt(sb)->flags &
 101                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
 102 }
 103
 104 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
 105 {
 106         return sb_dqopt(sb)->flags &
 107                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
 108 }
 109
 110 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
 111 {
 112         return sb_dqopt(sb)->flags &
 113                                 dquot_state_flag(DQUOT_SUSPENDED, type);
 114 }
 115
 116 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
 117 {
 118         unsigned type, tmsk = 0;
 119         for (type = 0; type < MAXQUOTAS; type++)
 120                 tmsk |= sb_has_quota_suspended(sb, type) << type;
 121         return tmsk;
 122 }
 123
 124 /* Does kernel know about any quota information for given sb + type? */
 125 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
 126 {
 127         /* Currently if anything is on, then quota usage is on as well */
 128         return sb_has_quota_usage_enabled(sb, type);
 129 }
 130
 131 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
 132 {
 133         unsigned type, tmsk = 0;
 134         for (type = 0; type < MAXQUOTAS; type++)
 135                 tmsk |= sb_has_quota_loaded(sb, type) << type;
 136         return  tmsk;
 137 }
 138
 139 static inline bool sb_has_quota_active(struct super_block *sb, int type)
 140 {
 141         return sb_has_quota_loaded(sb, type) &&
 142                !sb_has_quota_suspended(sb, type);
 143 }
 144
 145 static inline unsigned sb_any_quota_active(struct super_block *sb)
 146 {
 147         return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
 148 }
 149
 150 /*
 151  * Operations supported for diskquotas.
 152  */
 153 extern const struct dquot_operations dquot_operations;
 154 extern const struct quotactl_ops dquot_quotactl_ops;
 155
 156 #else
 157
 158 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
 159 {
 160         return 0;
 161 }
 162
 163 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
 164 {
 165         return 0;
 166 }
 167
 168 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 169 {
 170         return 0;
 171 }
 172
 173 static inline int sb_any_quota_suspended(struct super_block *sb)
 174 {
 175         return 0;
 176 }
 177
 178 /* Does kernel know about any quota information for given sb + type? */
 179 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
 180 {
 181         return 0;
 182 }
 183
 184 static inline int sb_any_quota_loaded(struct super_block *sb)
 185 {
 186         return 0;
 187 }
 188
 189 static inline int sb_has_quota_active(struct super_block *sb, int type)
 190 {
 191         return 0;
 192 }
 193
 194 static inline int sb_any_quota_active(struct super_block *sb)
 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 warn, int reserve)
 223 {
 224         if (!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 reserve)
 231 {
 232         if (!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, 1, 0);
 265 }
 266
 267 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
 268 {
 269         int ret;
 270
 271         ret = dquot_alloc_space_nodirty(inode, nr);
 272         if (!ret)
 273                 mark_inode_dirty(inode);
 274         return ret;
 275 }
 276
 277 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 278 {
 279         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 280 }
 281
 282 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
 283 {
 284         return dquot_alloc_space(inode, nr << inode->i_blkbits);
 285 }
 286
 287 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 288 {
 289         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0, 0);
 290 }
 291
 292 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
 293 {
 294         int ret;
 295
 296         ret = dquot_prealloc_block_nodirty(inode, nr);
 297         if (!ret)
 298                 mark_inode_dirty(inode);
 299         return ret;
 300 }
 301
 302 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
 303 {
 304         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 1, 1);
 305 }
 306
 307 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
 308 {
 309         int ret;
 310
 311         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
 312         if (!ret)
 313                 mark_inode_dirty(inode);
 314         return ret;
 315 }
 316
 317 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
 318 {
 319         __dquot_free_space(inode, nr, 0);
 320 }
 321
 322 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
 323 {
 324         dquot_free_space_nodirty(inode, nr);
 325         mark_inode_dirty(inode);
 326 }
 327
 328 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
 329 {
 330         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
 331 }
 332
 333 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
 334 {
 335         dquot_free_space(inode, nr << inode->i_blkbits);
 336 }
 337
 338 static inline void dquot_release_reservation_block(struct inode *inode,
 339                 qsize_t nr)
 340 {
 341         __dquot_free_space(inode, nr << inode->i_blkbits, 1);
 342 }
 343
 344 #endif /* _LINUX_QUOTAOPS_ */