[PATCHv5 2/6] ext4: Optimize ext4_ext_precache for 0 depth
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From: Ritesh Harjani <hidden>
Date: 2020-02-28 09:27:20
Also in:
linux-fsdevel
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
This patch avoids the memory alloc & free path when depth is 0, since anyway there is no extra caching done in that case. So on checking depth 0, simply return early. Signed-off-by: Ritesh Harjani <redacted> Reviewed-by: Jan Kara <jack@suse.cz> --- fs/ext4/extents.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ee83fe7c98aa..0de548bb3c90 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c@@ -594,6 +594,12 @@ int ext4_ext_precache(struct inode *inode) down_read(&ei->i_data_sem); depth = ext_depth(inode); + /* Don't cache anything if there are no external extent blocks */ + if (!depth) { + up_read(&ei->i_data_sem); + return ret; + } + path = kcalloc(depth + 1, sizeof(struct ext4_ext_path), GFP_NOFS); if (path == NULL) {
@@ -601,9 +607,6 @@ int ext4_ext_precache(struct inode *inode) return -ENOMEM; } - /* Don't cache anything if there are no external extent blocks */ - if (depth == 0) - goto out; path[0].p_hdr = ext_inode_hdr(inode); ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0); if (ret)
--
2.21.0