ocfs2: Do not map blocks from local quota file on each write
There is no need to map offset of local dquot structure to on disk block
in each quota write. It is enough to map it just once and store the physical
block number in quota structure in memory. Moreover this simplifies locking
as we do not have to take ip_alloc_sem from quota write path.
Acked-by: Joel Becker <Joel.Becker@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 884b641..a88f1d1 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -862,18 +862,17 @@
{
struct super_block *sb = dquot->dq_sb;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
- struct buffer_head *bh = NULL;
+ struct buffer_head *bh;
+ struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_type];
int status;
- status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
- ol_dqblk_file_block(sb, od->dq_local_off),
- &bh);
+ status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
+ &bh);
if (status) {
mlog_errno(status);
goto out;
}
- status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
- olq_set_dquot, od);
+ status = ocfs2_modify_bh(lqinode, bh, olq_set_dquot, od);
if (status < 0) {
mlog_errno(status);
goto out;
@@ -1197,17 +1196,27 @@
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
int offset;
int status;
+ u64 pcount;
+ down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
chunk = ocfs2_find_free_entry(sb, type, &offset);
if (!chunk) {
chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
- if (IS_ERR(chunk))
- return PTR_ERR(chunk);
+ if (IS_ERR(chunk)) {
+ status = PTR_ERR(chunk);
+ goto out;
+ }
} else if (IS_ERR(chunk)) {
- return PTR_ERR(chunk);
+ status = PTR_ERR(chunk);
+ goto out;
}
od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
od->dq_chunk = chunk;
+ status = ocfs2_extent_map_get_blocks(lqinode,
+ ol_dqblk_block(sb, chunk->qc_num, offset),
+ &od->dq_local_phys_blk,
+ &pcount,
+ NULL);
/* Initialize dquot structure on disk */
status = ocfs2_local_write_dquot(dquot);
@@ -1224,6 +1233,7 @@
goto out;
}
out:
+ up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
return status;
}
