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Commit a09a0a70 authored by Liu Bo's avatar Liu Bo Committed by Chris Mason
Browse files

Btrfs: get better concurrency for snapshot-aware defrag work 



Using spinning case instead of blocking will result in better concurrency
overall.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
parent de3cb945

fs/btrfs/inode.c

+3 −0
Original line number Diff line number Diff line
@@ -2312,6 +2312,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path, 
	key.type = BTRFS_EXTENT_DATA_KEY;

	key.offset = start;



	path->leave_spinning = 1;

	if (merge) {

		struct btrfs_file_extent_item *fi;

		u64 extent_len;
@@ -2368,6 +2369,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path, 


	btrfs_mark_buffer_dirty(leaf);

	inode_add_bytes(inode, len);

	btrfs_release_path(path);



	ret = btrfs_inc_extent_ref(trans, root, new->bytenr,

			new->disk_len, 0,
@@ -2381,6 +2383,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path, 
	ret = 1;

out_free_path:

	btrfs_release_path(path);

	path->leave_spinning = 0;

	btrfs_end_transaction(trans, root);

out_unlock:

	unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end,