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Btrfs: set leave_spinning in btrfs_get_extent

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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: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-08-25 13:47:09 +08:00 committed by David Sterba
parent de2c6615dc
commit e49aabd973
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/inode.c
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@ -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 @@ next:
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) {