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quota: generalize quota transfer interface 

Current quota transfer interface support only uid/gid.
This patch extend interface in order to support various quotas types
The goal is accomplished without changes in most frequently used
vfs_dq_transfer() func.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Dmitry Monakhov 2010-02-16 08:31:50 +03:00 committed by Jan Kara
parent ad1e6e8da9
commit 8ddd69d6df
3 changed files with 22 additions and 14 deletions
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32
fs/quota/dquot.c
View File

@ -1695,15 +1695,13 @@ EXPORT_SYMBOL(dquot_free_inode);
* This operation can block, but only after everything is updated
* A transaction must be started when entering this function.
*/
int dquot_transfer(struct inode *inode, struct iattr *iattr)
int dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask)
{
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;
int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
char warntype_to[MAXQUOTAS];
char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
@ -1717,13 +1715,10 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
transfer_to[cnt] = NULL;
warntype_to[cnt] = QUOTA_NL_NOWARN;
}
if (chuid)
transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid,
USRQUOTA);
if (chgid)
transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid,
GRPQUOTA);
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (mask & (1 << cnt))
transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt);
}
down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
@ -1799,12 +1794,25 @@ over_quota:
}
EXPORT_SYMBOL(dquot_transfer);
/* Wrapper for transferring ownership of an inode */
/* Wrapper for transferring ownership of an inode for uid/gid only
* Called from FSXXX_setattr()
*/
int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
{
qid_t chid[MAXQUOTAS];
unsigned long mask = 0;
if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) {
mask |= 1 << USRQUOTA;
chid[USRQUOTA] = iattr->ia_uid;
}
if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) {
mask |= 1 << GRPQUOTA;
chid[GRPQUOTA] = iattr->ia_gid;
}
if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
vfs_dq_init(inode);
if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
if (inode->i_sb->dq_op->transfer(inode, chid, mask) == NO_QUOTA)
return 1;
}
return 0;

2
include/linux/quota.h
View File

@ -301,7 +301,7 @@ struct dquot_operations {
int (*alloc_inode) (const struct inode *, qsize_t);
int (*free_space) (struct inode *, qsize_t);
int (*free_inode) (const struct inode *, qsize_t);
int (*transfer) (struct inode *, struct iattr *);
int (*transfer) (struct inode *, qid_t *, unsigned long);
int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */

2
include/linux/quotaops.h
View File

@ -43,7 +43,7 @@ void dquot_release_reserved_space(struct inode *inode, qsize_t number);
int dquot_free_space(struct inode *inode, qsize_t number);
int dquot_free_inode(const struct inode *inode, qsize_t number);
int dquot_transfer(struct inode *inode, struct iattr *iattr);
int dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask);
int dquot_commit(struct dquot *dquot);
int dquot_acquire(struct dquot *dquot);
int dquot_release(struct dquot *dquot);