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