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 int remove_inode_dquot_ref(struct inode *inode, int type,
  41                            struct list_head *tofree_head);
  42
  43 extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
  44 extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  45                 int format_id, int type);
  46 extern int vfs_quota_off(struct super_block *sb, int type);
  47 #define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type)
  48 extern int vfs_quota_sync(struct super_block *sb, int type);
  49 extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  50 extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  51 extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  52 extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  53
  54 /*
  55  * Operations supported for diskquotas.
  56  */
  57 extern struct dquot_operations dquot_operations;
  58 extern struct quotactl_ops vfs_quotactl_ops;
  59
  60 #define sb_dquot_ops (&dquot_operations)
  61 #define sb_quotactl_ops (&vfs_quotactl_ops)
  62
  63 /* It is better to call this function outside of any transaction as it might
  64  * need a lot of space in journal for dquot structure allocation. */
  65 static __inline__ void DQUOT_INIT(struct inode *inode)
  66 {
  67         BUG_ON(!inode->i_sb);
  68         if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
  69                 inode->i_sb->dq_op->initialize(inode, -1);
  70 }
  71
  72 /* The same as with DQUOT_INIT */
  73 static __inline__ void DQUOT_DROP(struct inode *inode)
  74 {
  75         /* Here we can get arbitrary inode from clear_inode() so we have
  76          * to be careful. OTOH we don't need locking as quota operations
  77          * are allowed to change only at mount time */
  78         if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
  79             && inode->i_sb->dq_op->drop) {
  80                 int cnt;
  81                 /* Test before calling to rule out calls from proc and such
  82                  * where we are not allowed to block. Note that this is
  83                  * actually reliable test even without the lock - the caller
  84                  * must assure that nobody can come after the DQUOT_DROP and
  85                  * add quota pointers back anyway */
  86                 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
  87                         if (inode->i_dquot[cnt] != NODQUOT)
  88                                 break;
  89                 if (cnt < MAXQUOTAS)
  90                         inode->i_sb->dq_op->drop(inode);
  91         }
  92 }
  93
  94 /* The following allocation/freeing/transfer functions *must* be called inside
  95  * a transaction (deadlocks possible otherwise) */
  96 static __inline__ int DQUOT_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 DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
 109 {
 110         int ret;
 111         if (!(ret =  DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
 112                 mark_inode_dirty(inode);
 113         return ret;
 114 }
 115
 116 static __inline__ int DQUOT_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 DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
 129 {
 130         int ret;
 131         if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
 132                 mark_inode_dirty(inode);
 133         return ret;
 134 }
 135
 136 static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode)
 137 {
 138         if (sb_any_quota_enabled(inode->i_sb)) {
 139                 DQUOT_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 DQUOT_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 DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
 155 {
 156         DQUOT_FREE_SPACE_NODIRTY(inode, nr);
 157         mark_inode_dirty(inode);
 158 }
 159
 160 static __inline__ void DQUOT_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 static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
 167 {
 168         if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
 169                 DQUOT_INIT(inode);
 170                 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
 171                         return 1;
 172         }
 173         return 0;
 174 }
 175
 176 /* The following two functions cannot be called inside a transaction */
 177 #define DQUOT_SYNC(sb)  sync_dquots(sb, -1)
 178
 179 static __inline__ int DQUOT_OFF(struct super_block *sb)
 180 {
 181         int ret = -ENOSYS;
 182
 183         if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
 184                 ret = sb->s_qcop->quota_off(sb, -1);
 185         return ret;
 186 }
 187
 188 #else
 189
 190 /*
 191  * NO-OP when quota not configured.
 192  */
 193 #define sb_dquot_ops                            (NULL)
 194 #define sb_quotactl_ops                         (NULL)
 195 #define DQUOT_INIT(inode)                       do { } while(0)
 196 #define DQUOT_DROP(inode)                       do { } while(0)
 197 #define DQUOT_ALLOC_INODE(inode)                (0)
 198 #define DQUOT_FREE_INODE(inode)                 do { } while(0)
 199 #define DQUOT_SYNC(sb)                          do { } while(0)
 200 #define DQUOT_OFF(sb)                           do { } while(0)
 201 #define DQUOT_TRANSFER(inode, iattr)            (0)
 202 static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 203 {
 204         inode_add_bytes(inode, nr);
 205         return 0;
 206 }
 207
 208 static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
 209 {
 210         DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
 211         mark_inode_dirty(inode);
 212         return 0;
 213 }
 214
 215 static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 216 {
 217         inode_add_bytes(inode, nr);
 218         return 0;
 219 }
 220
 221 static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
 222 {
 223         DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
 224         mark_inode_dirty(inode);
 225         return 0;
 226 }
 227
 228 static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 229 {
 230         inode_sub_bytes(inode, nr);
 231 }
 232
 233 static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
 234 {
 235         DQUOT_FREE_SPACE_NODIRTY(inode, nr);
 236         mark_inode_dirty(inode);
 237 }
 238
 239 #endif /* CONFIG_QUOTA */
 240
 241 #define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 242 #define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 243 #define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 244 #define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 245 #define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 246 #define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
 247
 248 #endif /* _LINUX_QUOTAOPS_ */