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/*
* 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/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(struct super_block *sb, char *qf_name,
int format_id, int type);
extern int vfs_quota_off(struct super_block *sb, int 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 */
static inline void DQUOT_SYNC(struct super_block *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 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) (0)
#define DQUOT_TRANSFER(inode, iattr) (0)
static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
inode_add_bytes(inode, nr);
return 0;
}
static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
{
DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
mark_inode_dirty(inode);
return 0;
}
static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
inode_add_bytes(inode, nr);
return 0;
}
static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
{
DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
mark_inode_dirty(inode);
return 0;
}
static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
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);
}
#endif /* CONFIG_QUOTA */
static inline int DQUOT_PREALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
{
return DQUOT_PREALLOC_SPACE_NODIRTY(inode,
nr << inode->i_sb->s_blocksize_bits);
}
static inline int DQUOT_PREALLOC_BLOCK(struct inode *inode, qsize_t nr)
{
return DQUOT_PREALLOC_SPACE(inode,
nr << inode->i_sb->s_blocksize_bits);
}
static inline int DQUOT_ALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
{
return DQUOT_ALLOC_SPACE_NODIRTY(inode,
nr << inode->i_sb->s_blocksize_bits);
}
static inline int DQUOT_ALLOC_BLOCK(struct inode *inode, qsize_t nr)
{
return DQUOT_ALLOC_SPACE(inode,
nr << inode->i_sb->s_blocksize_bits);
}
static inline void DQUOT_FREE_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
{
DQUOT_FREE_SPACE_NODIRTY(inode, nr << inode->i_sb->s_blocksize_bits);
}
static inline void DQUOT_FREE_BLOCK(struct inode *inode, qsize_t nr)
{
DQUOT_FREE_SPACE(inode, nr << inode->i_sb->s_blocksize_bits);
}
#endif /* _LINUX_QUOTAOPS_ */
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