ext4: Fix discard of inode prealloc space with delayed allocation.
With delayed allocation we should not/cannot discard inode prealloc
space during file close. We would still have dirty pages for which we
haven't allocated blocks yet. With this fix after each get_blocks
request we check whether we have zero reserved blocks and if yes and
we don't have any writers on the file we discard inode prealloc space.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 80ed6dc..7dcac9d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1067,9 +1067,16 @@
/*
* free those over-booking quota for metadata blocks
*/
-
if (mdb_free)
vfs_dq_release_reservation_block(inode, mdb_free);
+
+ /*
+ * If we have done all the pending block allocations and if
+ * there aren't any writers on the inode, we can discard the
+ * inode's preallocations.
+ */
+ if (!total && (atomic_read(&inode->i_writecount) == 0))
+ ext4_discard_preallocations(inode);
}
/*