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Diffstat (limited to 'include/linux/quotaops.h')
| -rw-r--r-- | include/linux/quotaops.h | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h new file mode 100644 index 00000000000..e57baa85e74 --- /dev/null +++ b/include/linux/quotaops.h @@ -0,0 +1,246 @@ +/* + * Definitions for diskquota-operations. When diskquota is configured these + * macros expand to the right source-code. + * + * Author: Marco van Wieringen <mvw@planets.elm.net> + * + * Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $ + * + */ +#ifndef _LINUX_QUOTAOPS_ +#define _LINUX_QUOTAOPS_ + +#include <linux/config.h> +#include <linux/smp_lock.h> + +#include <linux/fs.h> + +#if defined(CONFIG_QUOTA) + +/* + * declaration of quota_function calls in kernel. + */ +extern void sync_dquots(struct super_block *sb, int type); + +extern int dquot_initialize(struct inode *inode, int type); +extern int dquot_drop(struct inode *inode); + +extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc); +extern int dquot_alloc_inode(const struct inode *inode, unsigned long number); + +extern int dquot_free_space(struct inode *inode, qsize_t number); +extern int dquot_free_inode(const struct inode *inode, unsigned long number); + +extern int dquot_transfer(struct inode *inode, struct iattr *iattr); +extern int dquot_commit(struct dquot *dquot); +extern int dquot_acquire(struct dquot *dquot); +extern int dquot_release(struct dquot *dquot); +extern int dquot_commit_info(struct super_block *sb, int type); +extern int dquot_mark_dquot_dirty(struct dquot *dquot); + +extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path); +extern int vfs_quota_on_mount(int type, int format_id, struct dentry *dentry); +extern int vfs_quota_off(struct super_block *sb, int type); +#define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type) +extern int vfs_quota_sync(struct super_block *sb, int type); +extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); +extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); +extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di); +extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di); + +/* + * Operations supported for diskquotas. + */ +extern struct dquot_operations dquot_operations; +extern struct quotactl_ops vfs_quotactl_ops; + +#define sb_dquot_ops (&dquot_operations) +#define sb_quotactl_ops (&vfs_quotactl_ops) + +/* It is better to call this function outside of any transaction as it might + * need a lot of space in journal for dquot structure allocation. */ +static __inline__ void DQUOT_INIT(struct inode *inode) +{ + BUG_ON(!inode->i_sb); + if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) + inode->i_sb->dq_op->initialize(inode, -1); +} + +/* The same as with DQUOT_INIT */ +static __inline__ void DQUOT_DROP(struct inode *inode) +{ + /* Here we can get arbitrary inode from clear_inode() so we have + * to be careful. OTOH we don't need locking as quota operations + * are allowed to change only at mount time */ + if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op + && inode->i_sb->dq_op->drop) { + int cnt; + /* Test before calling to rule out calls from proc and such + * where we are not allowed to block. Note that this is + * actually reliable test even without the lock - the caller + * must assure that nobody can come after the DQUOT_DROP and + * add quota pointers back anyway */ + for (cnt = 0; cnt < MAXQUOTAS; cnt++) + if (inode->i_dquot[cnt] != NODQUOT) + break; + if (cnt < MAXQUOTAS) + inode->i_sb->dq_op->drop(inode); + } +} + +/* The following allocation/freeing/transfer functions *must* be called inside + * a transaction (deadlocks possible otherwise) */ +static __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + if (sb_any_quota_enabled(inode->i_sb)) { + /* Used space is updated in alloc_space() */ + if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA) + return 1; + } + else + inode_add_bytes(inode, nr); + return 0; +} + +static __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr) +{ + int ret; + if (!(ret = DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr))) + mark_inode_dirty(inode); + return ret; +} + +static __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + if (sb_any_quota_enabled(inode->i_sb)) { + /* Used space is updated in alloc_space() */ + if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA) + return 1; + } + else + inode_add_bytes(inode, nr); + return 0; +} + +static __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr) +{ + int ret; + if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr))) + mark_inode_dirty(inode); + return ret; +} + +static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode) +{ + if (sb_any_quota_enabled(inode->i_sb)) { + DQUOT_INIT(inode); + if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA) + return 1; + } + return 0; +} + +static __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + if (sb_any_quota_enabled(inode->i_sb)) + inode->i_sb->dq_op->free_space(inode, nr); + else + inode_sub_bytes(inode, nr); +} + +static __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr) +{ + DQUOT_FREE_SPACE_NODIRTY(inode, nr); + mark_inode_dirty(inode); +} + +static __inline__ void DQUOT_FREE_INODE(struct inode *inode) +{ + if (sb_any_quota_enabled(inode->i_sb)) + inode->i_sb->dq_op->free_inode(inode, 1); +} + +static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr) +{ + if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) { + DQUOT_INIT(inode); + if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) + return 1; + } + return 0; +} + +/* The following two functions cannot be called inside a transaction */ +#define DQUOT_SYNC(sb) sync_dquots(sb, -1) + +static __inline__ int DQUOT_OFF(struct super_block *sb) +{ + int ret = -ENOSYS; + + if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off) + ret = sb->s_qcop->quota_off(sb, -1); + return ret; +} + +#else + +/* + * NO-OP when quota not configured. + */ +#define sb_dquot_ops (NULL) +#define sb_quotactl_ops (NULL) +#define sync_dquots_dev(dev,type) (NULL) +#define DQUOT_INIT(inode) do { } while(0) +#define DQUOT_DROP(inode) do { } while(0) +#define DQUOT_ALLOC_INODE(inode) (0) +#define DQUOT_FREE_INODE(inode) do { } while(0) +#define DQUOT_SYNC(sb) do { } while(0) +#define DQUOT_OFF(sb) do { } while(0) +#define DQUOT_TRANSFER(inode, iattr) (0) +extern __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + inode_add_bytes(inode, nr); + return 0; +} + +extern __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr) +{ + DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr); + mark_inode_dirty(inode); + return 0; +} + +extern __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + inode_add_bytes(inode, nr); + return 0; +} + +extern __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr) +{ + DQUOT_ALLOC_SPACE_NODIRTY(inode, nr); + mark_inode_dirty(inode); + return 0; +} + +extern __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr) +{ + inode_sub_bytes(inode, nr); +} + +extern __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr) +{ + DQUOT_FREE_SPACE_NODIRTY(inode, nr); + mark_inode_dirty(inode); +} + +#endif /* CONFIG_QUOTA */ + +#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) +#define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) +#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) +#define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) +#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) +#define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits) + +#endif /* _LINUX_QUOTAOPS_ */ |