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
  15 #include <linux/fs.h>
  16
  17 #if defined(CONFIG_QUOTA)
  18
  19 /*
  20  * declaration of quota_function calls in kernel.
  21  */
  22 extern void sync_dquots(struct super_block *sb, int type);
  23
  24 extern int dquot_initialize(struct inode *inode, int type);
  25 extern int dquot_drop(struct inode *inode);
  26
  27 extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  28 extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
  29
  30 extern int dquot_free_space(struct inode *inode, qsize_t number);
  31 extern int dquot_free_inode(const struct inode *inode, unsigned long number);
  32
  33 extern int dquot_transfer(struct inode *inode, struct iattr *iattr);
  34 extern int dquot_commit(struct dquot *dquot);
  35 extern int dquot_acquire(struct dquot *dquot);
  36 extern int dquot_release(struct dquot *dquot);
  37 extern int dquot_commit_info(struct super_block *sb, int type);
  38 extern int dquot_mark_dquot_dirty(struct dquot *dquot);
  39
  40 extern int vfs_quota_on(struct super_block *sb, int type, int format_id,
  41                 char *path, int remount);
  42 extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  43                 int format_id, int type);
  44 extern int vfs_quota_off(struct super_block *sb, int type, int remount);
  45 extern int vfs_quota_sync(struct super_block *sb, int type);
  46 extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  47 extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  48 extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  49 extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  50
  51 /*
  52  * Operations supported for diskquotas.
  53  */
  54 extern struct dquot_operations dquot_operations;
  55 extern struct quotactl_ops vfs_quotactl_ops;
  56
  57 #define sb_dquot_ops (&dquot_operations)
  58 #define sb_quotactl_ops (&vfs_quotactl_ops)
  59
  60 /* It is better to call this function outside of any transaction as it might
  61  * need a lot of space in journal for dquot structure allocation. */
  62 static inline void DQUOT_INIT(struct inode *inode)
  63 {
  64         BUG_ON(!inode->i_sb);
  65         if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
  66                 inode->i_sb->dq_op->initialize(inode, -1);
  67 }
  68
  69 /* The same as with DQUOT_INIT */
  70 static inline void DQUOT_DROP(struct inode *inode)
  71 {
  72         /* Here we can get arbitrary inode from clear_inode() so we have
  73          * to be careful. OTOH we don't need locking as quota operations
  74          * are allowed to change only at mount time */
  75         if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
  76             && inode->i_sb->dq_op->drop) {
  77                 int cnt;
  78                 /* Test before calling to rule out calls from proc and such
  79                  * where we are not allowed to block. Note that this is
  80                  * actually reliable test even without the lock - the caller
  81                  * must assure that nobody can come after the DQUOT_DROP and
  82                  * add quota pointers back anyway */
  83                 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
  84                         if (inode->i_dquot[cnt] != NODQUOT)
  85                                 break;
  86                 if (cnt < MAXQUOTAS)
  87                         inode->i_sb->dq_op->drop(inode);
  88         }
  89 }
  90
  91 /* The following allocation/freeing/transfer functions *must* be called inside
  92  * a transaction (deadlocks possible otherwise) */
  93 static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
  94 {
  95         if (sb_any_quota_enabled(inode->i_sb)) {
  96                 /* Used space is updated in alloc_space() */
  97                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
  98                         return 1;
  99         }
 100         else
 101                 inode_add_bytes(inode, nr);
 102         return 0;
 103 }
 104
 105 static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
 106 {
 107         int ret;
 108         if (!(ret =  DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
 109                 mark_inode_dirty(inode);
 110         return ret;
 111 }
 112
 113 static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 114 {
 115         if (sb_any_quota_enabled(inode->i_sb)) {
 116                 /* Used space is updated in alloc_space() */
 117                 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
 118                         return 1;
 119         }
 120         else
 121                 inode_add_bytes(inode, nr);
 122         return 0;
 123 }
 124
 125 static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
 126 {
 127         int ret;
 128         if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
 129                 mark_inode_dirty(inode);
 130         return ret;
 131 }
 132
 133 static inline int DQUOT_ALLOC_INODE(struct inode *inode)
 134 {
 135         if (sb_any_quota_enabled(inode->i_sb)) {
 136                 DQUOT_INIT(inode);
 137                 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
 138                         return 1;
 139         }
 140         return 0;
 141 }
 142
 143 static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 144 {
 145         if (sb_any_quota_enabled(inode->i_sb))
 146                 inode->i_sb->dq_op->free_space(inode, nr);
 147         else
 148                 inode_sub_bytes(inode, nr);
 149 }
 150
 151 static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
 152 {
 153         DQUOT_FREE_SPACE_NODIRTY(inode, nr);
 154         mark_inode_dirty(inode);
 155 }
 156
 157 static inline void DQUOT_FREE_INODE(struct inode *inode)
 158 {
 159         if (sb_any_quota_enabled(inode->i_sb))
 160                 inode->i_sb->dq_op->free_inode(inode, 1);
 161 }
 162
 163 static inline int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
 164 {
 165         if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
 166                 DQUOT_INIT(inode);
 167                 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
 168                         return 1;
 169         }
 170         return 0;
 171 }
 172
 173 /* The following two functions cannot be called inside a transaction */
 174 static inline void DQUOT_SYNC(struct super_block *sb)
 175 {
 176         sync_dquots(sb, -1);
 177 }
 178
 179 static inline int DQUOT_OFF(struct super_block *sb, int remount)
 180 {
 181         int ret = -ENOSYS;
 182
 183         if (sb->s_qcop && sb->s_qcop->quota_off)
 184                 ret = sb->s_qcop->quota_off(sb, -1, remount);
 185         return ret;
 186 }
 187
 188 static inline int DQUOT_ON_REMOUNT(struct super_block *sb)
 189 {
 190         int cnt;
 191         int ret = 0, err;
 192
 193         if (!sb->s_qcop || !sb->s_qcop->quota_on)
 194                 return -ENOSYS;
 195         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 196                 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
 197                 if (err < 0 && !ret)
 198                         ret = err;
 199         }
 200         return ret;
 201 }
 202
 203 #else
 204
 205 /*
 206  * NO-OP when quota not configured.
 207  */
 208 #define sb_dquot_ops                            (NULL)
 209 #define sb_quotactl_ops                         (NULL)
 210
 211 static inline void DQUOT_INIT(struct inode *inode)
 212 {
 213 }
 214
 215 static inline void DQUOT_DROP(struct inode *inode)
 216 {
 217 }
 218
 219 static inline int DQUOT_ALLOC_INODE(struct inode *inode)
 220 {
 221         return 0;
 222 }
 223
 224 static inline void DQUOT_FREE_INODE(struct inode *inode)
 225 {
 226 }
 227
 228 static inline void DQUOT_SYNC(struct super_block *sb)
 229 {
 230 }
 231
 232 static inline int DQUOT_OFF(struct super_block *sb, int remount)
 233 {
 234         return 0;
 235 }
 236
 237 static inline int DQUOT_ON_REMOUNT(struct super_block *sb)
 238 {
 239         return 0;
 240 }
 241
 242 static inline int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
 243 {
 244         return 0;
 245 }
 246
 247 static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 248 {
 249         inode_add_bytes(inode, nr);
 250         return 0;
 251 }
 252
 253 static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
 254 {
 255         DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
 256         mark_inode_dirty(inode);
 257         return 0;
 258 }
 259
 260 static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 261 {
 262         inode_add_bytes(inode, nr);
 263         return 0;
 264 }
 265
 266 static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
 267 {
 268         DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
 269         mark_inode_dirty(inode);
 270         return 0;
 271 }
 272
 273 static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 274 {
 275         inode_sub_bytes(inode, nr);
 276 }
 277
 278 static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
 279 {
 280         DQUOT_FREE_SPACE_NODIRTY(inode, nr);
 281         mark_inode_dirty(inode);
 282 }
 283
 284 #endif /* CONFIG_QUOTA */
 285
 286 static inline int DQUOT_PREALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 287 {
 288         return DQUOT_PREALLOC_SPACE_NODIRTY(inode,
 289                         nr << inode->i_sb->s_blocksize_bits);
 290 }
 291
 292 static inline int DQUOT_PREALLOC_BLOCK(struct inode *inode, qsize_t nr)
 293 {
 294         return DQUOT_PREALLOC_SPACE(inode,
 295                         nr << inode->i_sb->s_blocksize_bits);
 296 }
 297
 298 static inline int DQUOT_ALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 299 {
 300         return DQUOT_ALLOC_SPACE_NODIRTY(inode,
 301                         nr << inode->i_sb->s_blocksize_bits);
 302 }
 303
 304 static inline int DQUOT_ALLOC_BLOCK(struct inode *inode, qsize_t nr)
 305 {
 306         return DQUOT_ALLOC_SPACE(inode,
 307                         nr << inode->i_sb->s_blocksize_bits);
 308 }
 309
 310 static inline void DQUOT_FREE_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 311 {
 312         DQUOT_FREE_SPACE_NODIRTY(inode, nr << inode->i_sb->s_blocksize_bits);
 313 }
 314
 315 static inline void DQUOT_FREE_BLOCK(struct inode *inode, qsize_t nr)
 316 {
 317         DQUOT_FREE_SPACE(inode, nr << inode->i_sb->s_blocksize_bits);
 318 }
 319
 320 #endif /* _LINUX_QUOTAOPS_ */