[PATCH v2 4/5] xfs: free cowblocks and retry on buffered write ENOSPC

From: Brian Foster <bfoster@redhat.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH v2 4/5] xfs: free cowblocks and retry on buffered write ENOSPC
Date: Wed, 11 Jan 2017 12:54:08 -0500	[thread overview]
Message-ID: <1484157249-464-5-git-send-email-bfoster@redhat.com> (raw)
In-Reply-To: <1484157249-464-1-git-send-email-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 bbb9eb6..ef7eaa6 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -655,6 +655,7 @@ 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

