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authorLiu Bo <bo.li.liu@oracle.com>2017-09-13 21:25:21 +0300
committerDavid Sterba <dsterba@suse.com>2017-09-26 15:53:04 +0300
commitfed3b381145e2e7c66b0b3f640851e1633ebd07f (patch)
tree97cfb34ab8188a3f67aebb344b0909f09fdb5ed3 /fs/btrfs
parentc2faff790ccd11ea5be8e3ca99713f116fcd6030 (diff)
downloadlinux-fed3b381145e2e7c66b0b3f640851e1633ebd07f.tar.xz
Btrfs: do not backup tree roots when fsync
It doesn't make sense to backup tree roots when doing fsync, since during fsync those tree roots have not been consistent on disk. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: Qu Wenruo <quwenruo.btrfs@gmx.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/disk-io.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 27d458640536..0f2271815eb6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3641,7 +3641,14 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
u64 flags;
do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
- backup_super_roots(fs_info);
+
+ /*
+ * max_mirrors == 0 indicates we're from commit_transaction,
+ * not from fsync where the tree roots in fs_info have not
+ * been consistent on disk.
+ */
+ if (max_mirrors == 0)
+ backup_super_roots(fs_info);
sb = fs_info->super_for_commit;
dev_item = &sb->dev_item;