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Commit e49aabd9 authored by Liu Bo's avatar Liu Bo Committed by David Sterba
Browse files

Btrfs: set leave_spinning in btrfs_get_extent 



Unless it's going to read inline extents from btree leaf to page,
btrfs_get_extent won't sleep during the period of holding path lock.

This sets leave_spinning at first and sets path to blocking mode right
before reading inline extent if that's the case.  The benefit is that a
path in spinning mode typically has lower impact (faster) on waiters
rather than that in the blocking mode.

Signed-off-by: default avatarLiu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent de2c6615

fs/btrfs/inode.c

+8 −0
Original line number Diff line number Diff line
@@ -6827,6 +6827,12 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, 
	/* Chances are we'll be called again, so go ahead and do readahead */

	path->reada = READA_FORWARD;



	/*

	 * Unless we're going to uncompress the inline extent, no sleep would

	 * happen.

	 */

	path->leave_spinning = 1;



	ret = btrfs_lookup_file_extent(NULL, root, path, objectid, start, 0);

	if (ret < 0) {

		err = ret;
@@ -6929,6 +6935,8 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, 
		em->orig_block_len = em->len;

		em->orig_start = em->start;

		ptr = btrfs_file_extent_inline_start(item) + extent_offset;



		btrfs_set_path_blocking(path);

		if (!PageUptodate(page)) {

			if (btrfs_file_extent_compression(leaf, item) !=

			    BTRFS_COMPRESS_NONE) {