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