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quota: provide interface for readding allocated space into reserved space

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ext4 needs to convert allocated (metadata) blocks back into blocks
reserved for delayed allocation. Add functions into quota code for
supporting such operation.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara 2013-08-17 09:32:32 -04:00 committed by Theodore Ts'o
parent 19883bd965
commit 1c8924eb10
4 changed files with 71 additions and 2 deletions
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46
fs/quota/dquot.c
View File

@ -1094,6 +1094,14 @@ static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
dquot->dq_dqb.dqb_rsvspace -= number;
}
static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
{
if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
number = dquot->dq_dqb.dqb_curspace;
dquot->dq_dqb.dqb_rsvspace += number;
dquot->dq_dqb.dqb_curspace -= number;
}
static inline
void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
{
@ -1528,6 +1536,15 @@ void inode_claim_rsv_space(struct inode *inode, qsize_t number)
}
EXPORT_SYMBOL(inode_claim_rsv_space);
void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
*inode_reserved_space(inode) += number;
__inode_sub_bytes(inode, number);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(inode_reclaim_rsv_space);
void inode_sub_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
@ -1701,6 +1718,35 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
}
EXPORT_SYMBOL(dquot_claim_space_nodirty);
/*
* Convert allocated space back to in-memory reserved quotas
*/
void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
{
int cnt;
if (!dquot_active(inode)) {
inode_reclaim_rsv_space(inode, number);
return;
}
down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
spin_lock(&dq_data_lock);
/* Claim reserved quotas to allocated quotas */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt])
dquot_reclaim_reserved_space(inode->i_dquot[cnt],
number);
}
/* Update inode bytes */
inode_reclaim_rsv_space(inode, number);
spin_unlock(&dq_data_lock);
mark_all_dquot_dirty(inode->i_dquot);
up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
return;
}
EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
/*
* This operation can block, but only after everything is updated
*/

11
fs/stat.c
View File

@ -447,9 +447,8 @@ void inode_add_bytes(struct inode *inode, loff_t bytes)
EXPORT_SYMBOL(inode_add_bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes)
void __inode_sub_bytes(struct inode *inode, loff_t bytes)
{
spin_lock(&inode->i_lock);
inode->i_blocks -= bytes >> 9;
bytes &= 511;
if (inode->i_bytes < bytes) {
@ -457,6 +456,14 @@ void inode_sub_bytes(struct inode *inode, loff_t bytes)
inode->i_bytes += 512;
}
inode->i_bytes -= bytes;
}
EXPORT_SYMBOL(__inode_sub_bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes)
{
spin_lock(&inode->i_lock);
__inode_sub_bytes(inode, bytes);
spin_unlock(&inode->i_lock);
}

1
include/linux/fs.h
View File

@ -2503,6 +2503,7 @@ extern void generic_fillattr(struct inode *, struct kstat *);
extern int vfs_getattr(struct path *, struct kstat *);
void __inode_add_bytes(struct inode *inode, loff_t bytes);
void inode_add_bytes(struct inode *inode, loff_t bytes);
void __inode_sub_bytes(struct inode *inode, loff_t bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes);
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);

15
include/linux/quotaops.h
View File

@ -41,6 +41,7 @@ void __quota_error(struct super_block *sb, const char *func,
void inode_add_rsv_space(struct inode *inode, qsize_t number);
void inode_claim_rsv_space(struct inode *inode, qsize_t number);
void inode_sub_rsv_space(struct inode *inode, qsize_t number);
void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
void dquot_initialize(struct inode *inode);
void dquot_drop(struct inode *inode);
@ -59,6 +60,7 @@ int dquot_alloc_inode(const struct inode *inode);
int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
void dquot_free_inode(const struct inode *inode);
void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
int dquot_disable(struct super_block *sb, int type, unsigned int flags);
/* Suspend quotas on remount RO */
@ -238,6 +240,13 @@ static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
return 0;
}
static inline int dquot_reclaim_space_nodirty(struct inode *inode,
qsize_t number)
{
inode_sub_bytes(inode, number);
return 0;
}
static inline int dquot_disable(struct super_block *sb, int type,
unsigned int flags)
{
@ -336,6 +345,12 @@ static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
return ret;
}
static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
{
dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
mark_inode_dirty_sync(inode);
}
static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
{
__dquot_free_space(inode, nr, 0);