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 less impact (faster) on waiters
rather than that in blocking mode.
Also fixes the misalignment of the prototype, which is too trivial for
a single patch.
Signed-off-by: Liu Bo <bo....@linux.alibaba.com>
---
v2: send out the correct patch.
fs/btrfs/ctree.h | 4 ++--
fs/btrfs/inode.c | 14 +++++++++++---
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1aeed3c0e949..00e506de70ba 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3177,8 +3177,8 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long
offset,
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
struct btrfs_root *root, int *was_new);
struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
- struct page *page, size_t pg_offset,
- u64 start, u64 end, int create);
+ struct page *page, size_t pg_offset,
+ u64 start, u64 end, int create);
int btrfs_update_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 10e86f7b5398..31d43355f052 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6787,9 +6787,9 @@ static noinline int uncompress_inline(struct btrfs_path
*path,
* This also copies inline extents directly into the page.
*/
struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
- struct page *page,
- size_t pg_offset, u64 start, u64 len,
- int create)
+ struct page *page,
+ size_t pg_offset, u64 start, u64 len,
+ int create)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
int ret;
@@ -6843,6 +6843,12 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode
*inode,
*/
path->reada = READA_FORWARD;
+ /*
+ * Unless we're going to uncompress 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;
@@ -6945,6 +6951,8 @@ 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) {
--
1.8.3.1
