On 2022/5/11 06:48, Qu Wenruo wrote:
On 2022/5/11 03:43, Heinrich Schuchardt wrote:
After returning if ret <= 0 we know that ret > 0. No need to check it.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com
Reviewed-by: Qu Wenruo wqu@suse.com
Just to mention for other guys in the btrfs list, this patch is for U-boot btrfs implementation.
And I also checked btrfs-fuse project, which has a similar function, lookup_file_extent(), it already does the check properly and even do extra quick exit for (ret > 0 && path->slots[0] == 0) case.
So you may want to also check btrfs-fuse project to find some possible optimization and cross-port to U-boot. (So far btrfs-fuse has better test coverage using fsstress, and cross-checked against kernel).
Thanks, Qu
Thanks, Qu
fs/btrfs/inode.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d00b515333..0173d30cd8 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -546,15 +546,12 @@ static int lookup_data_extent(struct btrfs_root *root, struct btrfs_path *path, /* Error or we're already at the file extent */ if (ret <= 0) return ret; - if (ret > 0) { - /* Check previous file extent */ - ret = btrfs_previous_item(root, path, ino, - BTRFS_EXTENT_DATA_KEY); - if (ret < 0) - return ret; - if (ret > 0) - goto check_next; - } + /* Check previous file extent */ + ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY); + if (ret < 0) + return ret; + if (ret > 0) + goto check_next; /* Now the key.offset must be smaller than @file_offset */ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); if (key.objectid != ino ||