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.h b/fs/ocfs2/quota.h
index 123bc52..e22d293 100644
--- a/fs/ocfs2/quota.h
+++ b/fs/ocfs2/quota.h
@@ -23,6 +23,7 @@
struct ocfs2_dquot {
struct dquot dq_dquot; /* Generic VFS dquot */
loff_t dq_local_off; /* Offset in the local quota file */
+ u64 dq_local_phys_blk; /* Physical block carrying quota structure */
struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */
unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */
s64 dq_origspace; /* Last globally synced space usage */
@@ -104,6 +105,8 @@
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
struct buffer_head **bh);
+int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
+ struct buffer_head **bh);
extern const struct dquot_operations ocfs2_quota_operations;
extern struct quota_format_type ocfs2_quota_format;