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 <[email protected]> 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, char *path); 41 extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 42 int format_id, int type); 43 extern int vfs_quota_off(struct super_block *sb, int type); 44 #define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type) 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 #define DQUOT_SYNC(sb) sync_dquots(sb, -1) 175 176 static __inline__ int DQUOT_OFF(struct super_block *sb) 177 { 178 int ret = -ENOSYS; 179 180 if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off) 181 ret = sb->s_qcop->quota_off(sb, -1); 182 return ret; 183 } 184 185 #else 186 187 /* 188 * NO-OP when quota not configured. 189 */ 190 #define sb_dquot_ops (NULL) 191 #define sb_quotactl_ops (NULL) 192 #define DQUOT_INIT(inode) do { } while(0) 193 #define DQUOT_DROP(inode) do { } while(0) 194 #define DQUOT_ALLOC_INODE(inode) (0) 195 #define DQUOT_FREE_INODE(inode) do { } while(0) 196 #define DQUOT_SYNC(sb) do { } while(0) 197 #define DQUOT_OFF(sb) do { } while(0) 198 #define DQUOT_TRANSFER(inode, iattr) (0) 199 static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) 200 { 201 inode_add_bytes(inode, nr); 202 return 0; 203 } 204 205 static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr) 206 { 207 DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr); 208 mark_inode_dirty(inode); 209 return 0; 210 } 211 212 static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) 213 { 214 inode_add_bytes(inode, nr); 215 return 0; 216 } 217 218 static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr) 219 { 220 DQUOT_ALLOC_SPACE_NODIRTY(inode, nr); 221 mark_inode_dirty(inode); 222 return 0; 223 } 224 225 static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr) 226 { 227 inode_sub_bytes(inode, nr); 228 } 229 230 static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr) 231 { 232 DQUOT_FREE_SPACE_NODIRTY(inode, nr); 233 mark_inode_dirty(inode); 234 } 235 236 #endif /* CONFIG_QUOTA */ 237 238 #define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 239 #define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 240 #define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 241 #define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 242 #define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 243 #define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) 244 245 #endif /* _LINUX_QUOTAOPS_ */ 246