On Wed, Jul 10, 2024 at 12:06:43PM +0800, libaokun@xxxxxxxxxxxxxxx wrote:
> From: Baokun Li <libaokun1@xxxxxxxxxx>
>
> The use of path and ppath is now very confusing, so to make the code more
> readable, pass path between functions uniformly, and get rid of ppath.
>
> After getting rid of ppath in get_ext_path(), its caller may pass an error
> pointer to ext4_free_ext_path(), so it needs to teach ext4_free_ext_path()
> and ext4_ext_drop_refs() to skip the error pointer. No functional changes.
>
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
> ---
> fs/ext4/extents.c | 5 +++--
> fs/ext4/move_extent.c | 34 +++++++++++++++++-----------------
> 2 files changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 5217e6f53467..6dfb5d03e197 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -116,7 +116,7 @@ static void ext4_ext_drop_refs(struct ext4_ext_path *path)
> {
> int depth, i;
>
> - if (!path)
> + if (IS_ERR_OR_NULL(path))
> return;
> depth = path->p_depth;
> for (i = 0; i <= depth; i++, path++)
> @@ -125,6 +125,8 @@ static void ext4_ext_drop_refs(struct ext4_ext_path *path)
>
> void ext4_free_ext_path(struct ext4_ext_path *path)
> {
> + if (IS_ERR_OR_NULL(path))
> + return;
> ext4_ext_drop_refs(path);
> kfree(path);
> }
> @@ -4191,7 +4193,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
> path = ext4_find_extent(inode, map->m_lblk, NULL, 0);
> if (IS_ERR(path)) {
> err = PTR_ERR(path);
> - path = NULL;
> goto out;
> }
>
> diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
> index b0ab19a913bf..a7186d63725a 100644
> --- a/fs/ext4/move_extent.c
> +++ b/fs/ext4/move_extent.c
> @@ -17,27 +17,23 @@
> * get_ext_path() - Find an extent path for designated logical block number.
> * @inode: inode to be searched
> * @lblock: logical block number to find an extent path
> - * @ppath: pointer to an extent path pointer (for output)
> + * @path: pointer to an extent path
> *
> - * ext4_find_extent wrapper. Return 0 on success, or a negative error value
> - * on failure.
> + * ext4_find_extent wrapper. Return an extent path pointer on success,
> + * or an error pointer on failure.
> */
> -static inline int
> +static inline struct ext4_ext_path *
> get_ext_path(struct inode *inode, ext4_lblk_t lblock,
> - struct ext4_ext_path **ppath)
> + struct ext4_ext_path *path)
> {
> - struct ext4_ext_path *path = *ppath;
> -
> - *ppath = NULL;
> path = ext4_find_extent(inode, lblock, path, EXT4_EX_NOCACHE);
> if (IS_ERR(path))
> - return PTR_ERR(path);
> + return path;
> if (path[ext_depth(inode)].p_ext == NULL) {
> ext4_free_ext_path(path);
> - return -ENODATA;
> + return ERR_PTR(-ENODATA);
> }
> - *ppath = path;
> - return 0;
> + return path;
> }
>
> /**
> @@ -95,9 +91,11 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
> int ret = 0;
> ext4_lblk_t last = from + count;
> while (from < last) {
> - *err = get_ext_path(inode, from, &path);
> - if (*err)
> - goto out;
> + path = get_ext_path(inode, from, path);
> + if (IS_ERR(path)) {
> + *err = PTR_ERR(path);
> + return ret;
> + }
> ext = path[ext_depth(inode)].p_ext;
> if (unwritten != ext4_ext_is_unwritten(ext))
> goto out;
> @@ -624,9 +622,11 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
> int offset_in_page;
> int unwritten, cur_len;
>
> - ret = get_ext_path(orig_inode, o_start, &path);
> - if (ret)
> + path = get_ext_path(orig_inode, o_start, path);
> + if (IS_ERR(path)) {
> + ret = PTR_ERR(path);
> goto out;
> + }
> ex = path[path->p_depth].p_ext;
> cur_blk = le32_to_cpu(ex->ee_block);
> cur_len = ext4_ext_get_actual_len(ex);
> --
> 2.39.2
Looks good Baokun, feel free to add:
Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Regards,
ojaswin
>
