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authorMingming Cao <cmm@us.ibm.com>2009-01-13 16:43:09 +0100
committerJan Kara <jack@suse.cz>2009-03-26 02:15:50 +0100
commitf18df228997fb716990590d248663981a15f17d4 (patch)
treef5fc935b09cddde325235c265fd3a553ee40af51 /include/linux
parent8e0ee43bc2c3e19db56a4adaa9a9b04ce885cd84 (diff)
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quota: Add quota reservation support
Delayed allocation defers the block allocation at the dirty pages flush-out time, doing quota charge/check at that time is too late. But we can't charge the quota blocks until blocks are really allocated, otherwise users could get overcharged after reboot from system crash. This patch adds quota reservation for delayed allocation. Quota blocks are reserved in memory, inode and quota won't gets dirtied until later block allocation time. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/quota.h3
-rw-r--r--include/linux/quotaops.h21
2 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/quota.h b/include/linux/quota.h
index d72d5d8..54b837f 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -198,6 +198,7 @@ struct mem_dqblk {
qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
qsize_t dqb_curspace; /* current used space */
+ qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
qsize_t dqb_isoftlimit; /* preferred inode limit */
qsize_t dqb_curinodes; /* current # allocated inodes */
@@ -308,6 +309,8 @@ struct dquot_operations {
int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
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);
};
/* Operations handling requests from userspace */
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 0b35b3a..3e3a0d2 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -183,6 +183,16 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
return ret;
}
+static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
+{
+ if (sb_any_quota_active(inode->i_sb)) {
+ /* Used space is updated in alloc_space() */
+ if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
+ return 1;
+ }
+ return 0;
+}
+
static inline int vfs_dq_alloc_inode(struct inode *inode)
{
if (sb_any_quota_active(inode->i_sb)) {
@@ -339,6 +349,11 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
return 0;
}
+static inline int vfs_dq_reserve_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);
@@ -376,6 +391,12 @@ static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
nr << inode->i_sb->s_blocksize_bits);
}
+static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
+{
+ return vfs_dq_reserve_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);