Commit fed3b381 authored Sep 13, 2017 by Liu Bo Committed by David Sterba Sep 26, 2017

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>

parent c2faff79

fs/btrfs/disk-io.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -3641,6 +3641,13 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
		u64 flags;

		do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);

		/*
		* 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;