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