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quota: Add quota reservation claim and released operations 

Reserved quota will be claimed at the block allocation time. Over-booked
quota could be returned back with the release callback function.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Mingming Cao 2009-01-13 16:43:14 +01:00 committed by Jan Kara
parent f18df22899
commit 740d9dcd94
3 changed files with 165 additions and 4 deletions
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110
fs/dquot.c
View File

@ -904,6 +904,23 @@ static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
dquot->dq_dqb.dqb_rsvspace += number;
}
/*
* Claim reserved quota space
*/
static void dquot_claim_reserved_space(struct dquot *dquot,
qsize_t number)
{
WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
dquot->dq_dqb.dqb_curspace += number;
dquot->dq_dqb.dqb_rsvspace -= number;
}
static inline
void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
{
dquot->dq_dqb.dqb_rsvspace -= number;
}
static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
{
if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
@ -1452,6 +1469,72 @@ warn_put_all:
return ret;
}
int dquot_claim_space(struct inode *inode, qsize_t number)
{
int cnt;
int ret = QUOTA_OK;
if (IS_NOQUOTA(inode)) {
inode_add_bytes(inode, number);
goto out;
}
down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
if (IS_NOQUOTA(inode)) {
up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
inode_add_bytes(inode, number);
goto out;
}
spin_lock(&dq_data_lock);
/* Claim reserved quotas to allocated quotas */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] != NODQUOT)
dquot_claim_reserved_space(inode->i_dquot[cnt],
number);
}
/* Update inode bytes */
inode_add_bytes(inode, number);
spin_unlock(&dq_data_lock);
/* Dirtify all the dquots - this can block when journalling */
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (inode->i_dquot[cnt])
mark_dquot_dirty(inode->i_dquot[cnt]);
up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
out:
return ret;
}
EXPORT_SYMBOL(dquot_claim_space);
/*
* Release reserved quota space
*/
void dquot_release_reserved_space(struct inode *inode, qsize_t number)
{
int cnt;
if (IS_NOQUOTA(inode))
goto out;
down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
if (IS_NOQUOTA(inode))
goto out_unlock;
spin_lock(&dq_data_lock);
/* Release reserved dquots */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] != NODQUOT)
dquot_free_reserved_space(inode->i_dquot[cnt], number);
}
spin_unlock(&dq_data_lock);
out_unlock:
up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
out:
return;
}
EXPORT_SYMBOL(dquot_release_reserved_space);
/*
* This operation can block, but only after everything is updated
*/
@ -1528,6 +1611,19 @@ int dquot_free_inode(const struct inode *inode, qsize_t number)
return QUOTA_OK;
}
/*
* call back function, get reserved quota space from underlying fs
*/
qsize_t dquot_get_reserved_space(struct inode *inode)
{
qsize_t reserved_space = 0;
if (sb_any_quota_active(inode->i_sb) &&
inode->i_sb->dq_op->get_reserved_space)
reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
return reserved_space;
}
/*
* Transfer the number of inode and blocks from one diskquota to an other.
*
@ -1536,7 +1632,8 @@ int dquot_free_inode(const struct inode *inode, qsize_t number)
*/
int dquot_transfer(struct inode *inode, struct iattr *iattr)
{
qsize_t space;
qsize_t space, cur_space;
qsize_t rsv_space = 0;
struct dquot *transfer_from[MAXQUOTAS];
struct dquot *transfer_to[MAXQUOTAS];
int cnt, ret = QUOTA_OK;
@ -1575,7 +1672,9 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
goto put_all;
}
spin_lock(&dq_data_lock);
space = inode_get_bytes(inode);
cur_space = inode_get_bytes(inode);
rsv_space = dquot_get_reserved_space(inode);
space = cur_space + rsv_space;
/* Build the transfer_from list and check the limits */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (transfer_to[cnt] == NODQUOT)
@ -1604,11 +1703,14 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
warntype_from_space[cnt] =
info_bdq_free(transfer_from[cnt], space);
dquot_decr_inodes(transfer_from[cnt], 1);
dquot_decr_space(transfer_from[cnt], space);
dquot_decr_space(transfer_from[cnt], cur_space);
dquot_free_reserved_space(transfer_from[cnt],
rsv_space);
}
dquot_incr_inodes(transfer_to[cnt], 1);
dquot_incr_space(transfer_to[cnt], space);
dquot_incr_space(transfer_to[cnt], cur_space);
dquot_resv_space(transfer_to[cnt], rsv_space);
inode->i_dquot[cnt] = transfer_to[cnt];
}

6
include/linux/quota.h
View File

@ -311,6 +311,12 @@ struct dquot_operations {
int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
/* reserve quota for delayed block allocation */
int (*reserve_space) (struct inode *, qsize_t, int);
/* claim reserved quota for delayed alloc */
int (*claim_space) (struct inode *, qsize_t);
/* release rsved quota for delayed alloc */
void (*release_rsv) (struct inode *, qsize_t);
/* get reserved quota for delayed alloc */
qsize_t (*get_reserved_space) (struct inode *);
};
/* Operations handling requests from userspace */

53
include/linux/quotaops.h
View File

@ -35,6 +35,11 @@ void dquot_destroy(struct dquot *dquot);
int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
int dquot_alloc_inode(const struct inode *inode, qsize_t number);
int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc);
int dquot_claim_space(struct inode *inode, qsize_t number);
void dquot_release_reserved_space(struct inode *inode, qsize_t number);
qsize_t dquot_get_reserved_space(struct inode *inode);
int dquot_free_space(struct inode *inode, qsize_t number);
int dquot_free_inode(const struct inode *inode, qsize_t number);
@ -203,6 +208,31 @@ static inline int vfs_dq_alloc_inode(struct inode *inode)
return 0;
}
/*
* Convert in-memory reserved quotas to real consumed quotas
*/
static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
{
if (sb_any_quota_active(inode->i_sb)) {
if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA)
return 1;
} else
inode_add_bytes(inode, nr);
mark_inode_dirty(inode);
return 0;
}
/*
* Release reserved (in-memory) quotas
*/
static inline
void vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
{
if (sb_any_quota_active(inode->i_sb))
inode->i_sb->dq_op->release_rsv(inode, nr);
}
static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
{
if (sb_any_quota_active(inode->i_sb))
@ -354,6 +384,17 @@ static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
return 0;
}
static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
{
return vfs_dq_alloc_space(inode, nr);
}
static inline
int vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
{
return 0;
}
static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
{
inode_sub_bytes(inode, nr);
@ -397,6 +438,18 @@ static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
nr << inode->i_blkbits);
}
static inline int vfs_dq_claim_block(struct inode *inode, qsize_t nr)
{
return vfs_dq_claim_space(inode,
nr << inode->i_blkbits);
}
static inline
void vfs_dq_release_reservation_block(struct inode *inode, qsize_t nr)
{
vfs_dq_release_reservation_space(inode, nr << inode->i_blkbits);
}
static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
{
vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);