[PATCH 5/6] xfs: free cowblocks and retry on buffered write ENOSPC

[Brian Foster <bfoster@redhat.com>]

XFS runs an eofblocks reclaim scan before returning an ENOSPC error to
userspace for buffered writes. This facilitates aggressive speculative
preallocation without causing user visible side effects such as
premature ENOSPC.

Run a cowblocks scan in the same situation to reclaim lingering COW fork
preallocation throughout the filesystem.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/xfs_file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index d818c16..7fd97c3 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -716,6 +716,7 @@ xfs_file_buffered_aio_write(
 		eofb.eof_scan_owner = ip->i_ino; /* for locking */
 		eofb.eof_flags = XFS_EOF_FLAGS_SYNC;
 		xfs_icache_free_eofblocks(ip->i_mount, &eofb);
+		xfs_icache_free_cowblocks(ip->i_mount, &eofb);
 		goto write_retry;
 	}
 
-- 
2.7.4