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  * Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
   8  *
   9  */
  10 #ifndef _LINUX_QUOTAOPS_
  11 #define _LINUX_QUOTAOPS_
  12
  13 #include <linux/smp_lock.h>
  14 #include <linux/fs.h>
  15
  16 static inline struct quota_info *sb_dqopt(struct super_block *sb)
  17 {
  18         return &sb->s_dquot;
  19 }
  20
  21 #if defined(CONFIG_QUOTA)
  22
  23 /*
  24  * declaration of quota_function calls in kernel.
  25  */
  26 void sync_dquots(struct super_block *sb, int type);
  27
  28 int dquot_initialize(struct inode *inode, int type);
  29 int dquot_drop(struct inode *inode);
  30
  31 int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  32 int dquot_alloc_inode(const struct inode *inode, unsigned long number);
  33
  34 int dquot_free_space(struct inode *inode, qsize_t number);
  35 int dquot_free_inode(const struct inode *inode, unsigned long number);
  36
  37 int dquot_transfer(struct inode *inode, struct iattr *iattr);
  38 int dquot_commit(struct dquot *dquot);
  39 int dquot_acquire(struct dquot *dquot);
  40 int dquot_release(struct dquot *dquot);
  41 int dquot_commit_info(struct super_block *sb, int type);
  42 int dquot_mark_dquot_dirty(struct dquot *dquot);
  43
  44 int vfs_quota_on(struct super_block *sb, int type, int format_id,
  45         char *path, int remount);
  46 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
  47         struct path *path);
  48 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  49         int format_id, int type);
  50 int vfs_quota_off(struct super_block *sb, int type, int remount);
  51 int vfs_quota_sync(struct super_block *sb, int type);
  52 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  53 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  54 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  55 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  56
  57 void vfs_dq_drop(struct inode *inode);
  58 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
  59 int vfs_dq_quota_on_remount(struct super_block *sb);
  60
  61 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  62 {
  63         return sb_dqopt(sb)->info + type;
  64 }
  65
  66 /*
  67  * Functions for checking status of quota
  68  */
  69
  70 static inline int sb_has_quota_enabled(struct super_block *sb, int type)
  71 {
  72         if (type == USRQUOTA)
  73                 return sb_dqopt(sb)->flags & DQUOT_USR_ENABLED;
  74         return sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED;
  75 }
  76
  77 static inline int sb_any_quota_enabled(struct super_block *sb)
  78 {
  79         return sb_has_quota_enabled(sb, USRQUOTA) ||
  80                 sb_has_quota_enabled(sb, GRPQUOTA);
  81 }
  82
  83 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
  84 {
  85         if (type == USRQUOTA)
  86                 return sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED;
  87         return sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED;
  88 }
  89
  90 static inline int sb_any_quota_suspended(struct super_block *sb)
  91 {
  92         return sb_has_quota_suspended(sb, USRQUOTA) ||
  93                 sb_has_quota_suspended(sb, GRPQUOTA);
  94 }
  95
  96 /*
  97  * Operations supported for diskquotas.
  98  */
  99 extern struct dquot_operations dquot_operations;
 100 extern struct quotactl_ops vfs_quotactl_ops;
 101
 102 #define sb_dquot_ops (&dquot_operations)
 103 #define sb_quotactl_ops (&vfs_quotactl_ops)
 104
 105 /* It is better to call this function outside of any transaction as it might
 106  * need a lot of space in journal for dquot structure allocation. */
 107 static inline void vfs_dq_init(struct inode *inode)
 108 {
 109         BUG_ON(!inode->i_sb);
 110         if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
 111                 inode->i_sb->dq_op->initialize(inode, -1);
 112 }
 113
 114 /* The following allocation/freeing/transfer functions *must* be called inside
 115  * a transaction (deadlocks possible otherwise) */
 116 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 117 {
 118         if (sb_any_quota_enabled(inode->i_sb)) {
 119                 /* Used space is updated in alloc_space() */
 120                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
 121                         return 1;
 122         }
 123         else
 124                 inode_add_bytes(inode, nr);
 125         return 0;
 126 }
 127
 128 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 129 {
 130         int ret;
 131         if (!(ret =  vfs_dq_prealloc_space_nodirty(inode, nr)))
 132                 mark_inode_dirty(inode);
 133         return ret;
 134 }
 135
 136 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 137 {
 138         if (sb_any_quota_enabled(inode->i_sb)) {
 139                 /* Used space is updated in alloc_space() */
 140                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
 141                         return 1;
 142         }
 143         else
 144                 inode_add_bytes(inode, nr);
 145         return 0;
 146 }
 147
 148 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 149 {
 150         int ret;
 151         if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
 152                 mark_inode_dirty(inode);
 153         return ret;
 154 }
 155
 156 static inline int vfs_dq_alloc_inode(struct inode *inode)
 157 {
 158         if (sb_any_quota_enabled(inode->i_sb)) {
 159                 vfs_dq_init(inode);
 160                 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
 161                         return 1;
 162         }
 163         return 0;
 164 }
 165
 166 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 167 {
 168         if (sb_any_quota_enabled(inode->i_sb))
 169                 inode->i_sb->dq_op->free_space(inode, nr);
 170         else
 171                 inode_sub_bytes(inode, nr);
 172 }
 173
 174 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 175 {
 176         vfs_dq_free_space_nodirty(inode, nr);
 177         mark_inode_dirty(inode);
 178 }
 179
 180 static inline void vfs_dq_free_inode(struct inode *inode)
 181 {
 182         if (sb_any_quota_enabled(inode->i_sb))
 183                 inode->i_sb->dq_op->free_inode(inode, 1);
 184 }
 185
 186 /* The following two functions cannot be called inside a transaction */
 187 static inline void vfs_dq_sync(struct super_block *sb)
 188 {
 189         sync_dquots(sb, -1);
 190 }
 191
 192 static inline int vfs_dq_off(struct super_block *sb, int remount)
 193 {
 194         int ret = -ENOSYS;
 195
 196         if (sb->s_qcop && sb->s_qcop->quota_off)
 197                 ret = sb->s_qcop->quota_off(sb, -1, remount);
 198         return ret;
 199 }
 200
 201 #else
 202
 203 static inline int sb_has_quota_enabled(struct super_block *sb, int type)
 204 {
 205         return 0;
 206 }
 207
 208 static inline int sb_any_quota_enabled(struct super_block *sb)
 209 {
 210         return 0;
 211 }
 212
 213 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 214 {
 215         return 0;
 216 }
 217
 218 static inline int sb_any_quota_suspended(struct super_block *sb)
 219 {
 220         return 0;
 221 }
 222
 223 /*
 224  * NO-OP when quota not configured.
 225  */
 226 #define sb_dquot_ops                            (NULL)
 227 #define sb_quotactl_ops                         (NULL)
 228
 229 static inline void vfs_dq_init(struct inode *inode)
 230 {
 231 }
 232
 233 static inline void vfs_dq_drop(struct inode *inode)
 234 {
 235 }
 236
 237 static inline int vfs_dq_alloc_inode(struct inode *inode)
 238 {
 239         return 0;
 240 }
 241
 242 static inline void vfs_dq_free_inode(struct inode *inode)
 243 {
 244 }
 245
 246 static inline void vfs_dq_sync(struct super_block *sb)
 247 {
 248 }
 249
 250 static inline int vfs_dq_off(struct super_block *sb, int remount)
 251 {
 252         return 0;
 253 }
 254
 255 static inline int vfs_dq_quota_on_remount(struct super_block *sb)
 256 {
 257         return 0;
 258 }
 259
 260 static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 261 {
 262         return 0;
 263 }
 264
 265 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 266 {
 267         inode_add_bytes(inode, nr);
 268         return 0;
 269 }
 270
 271 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 272 {
 273         vfs_dq_prealloc_space_nodirty(inode, nr);
 274         mark_inode_dirty(inode);
 275         return 0;
 276 }
 277
 278 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 279 {
 280         inode_add_bytes(inode, nr);
 281         return 0;
 282 }
 283
 284 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 285 {
 286         vfs_dq_alloc_space_nodirty(inode, nr);
 287         mark_inode_dirty(inode);
 288         return 0;
 289 }
 290
 291 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 292 {
 293         inode_sub_bytes(inode, nr);
 294 }
 295
 296 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 297 {
 298         vfs_dq_free_space_nodirty(inode, nr);
 299         mark_inode_dirty(inode);
 300 }
 301
 302 #endif /* CONFIG_QUOTA */
 303
 304 static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 305 {
 306         return vfs_dq_prealloc_space_nodirty(inode,
 307                         nr << inode->i_sb->s_blocksize_bits);
 308 }
 309
 310 static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
 311 {
 312         return vfs_dq_prealloc_space(inode,
 313                         nr << inode->i_sb->s_blocksize_bits);
 314 }
 315
 316 static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 317 {
 318         return vfs_dq_alloc_space_nodirty(inode,
 319                         nr << inode->i_sb->s_blocksize_bits);
 320 }
 321
 322 static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
 323 {
 324         return vfs_dq_alloc_space(inode,
 325                         nr << inode->i_sb->s_blocksize_bits);
 326 }
 327
 328 static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
 329 {
 330         vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
 331 }
 332
 333 static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
 334 {
 335         vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
 336 }
 337
 338 /*
 339  * Define uppercase equivalents for compatibility with old function names
 340  * Can go away when we think all users have been converted (15/04/2008)
 341  */
 342 #define DQUOT_INIT(inode) vfs_dq_init(inode)
 343 #define DQUOT_DROP(inode) vfs_dq_drop(inode)
 344 #define DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr) \
 345                                 vfs_dq_prealloc_space_nodirty(inode, nr)
 346 #define DQUOT_PREALLOC_SPACE(inode, nr) vfs_dq_prealloc_space(inode, nr)
 347 #define DQUOT_ALLOC_SPACE_NODIRTY(inode, nr) \
 348                                 vfs_dq_alloc_space_nodirty(inode, nr)
 349 #define DQUOT_ALLOC_SPACE(inode, nr) vfs_dq_alloc_space(inode, nr)
 350 #define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) \
 351                                 vfs_dq_prealloc_block_nodirty(inode, nr)
 352 #define DQUOT_PREALLOC_BLOCK(inode, nr) vfs_dq_prealloc_block(inode, nr)
 353 #define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) \
 354                                 vfs_dq_alloc_block_nodirty(inode, nr)
 355 #define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr)
 356 #define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode)
 357 #define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \
 358                                 vfs_dq_free_space_nodirty(inode, nr)
 359 #define DQUOT_FREE_SPACE(inode, nr) vfs_dq_free_space(inode, nr)
 360 #define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) \
 361                                 vfs_dq_free_block_nodirty(inode, nr)
 362 #define DQUOT_FREE_BLOCK(inode, nr) vfs_dq_free_block(inode, nr)
 363 #define DQUOT_FREE_INODE(inode) vfs_dq_free_inode(inode)
 364 #define DQUOT_TRANSFER(inode, iattr) vfs_dq_transfer(inode, iattr)
 365 #define DQUOT_SYNC(sb) vfs_dq_sync(sb)
 366 #define DQUOT_OFF(sb, remount) vfs_dq_off(sb, remount)
 367 #define DQUOT_ON_REMOUNT(sb) vfs_dq_quota_on_remount(sb)
 368
 369 #endif /* _LINUX_QUOTAOPS_ */