On Jul 1, 2020, at 2:30 AM, zhengliang <zhengliang6@xxxxxxxxxx> wrote:
>
> It should call trace exit in all return path for ext4_truncate.
>
> v2:
> It shoule call trace exit in all return path, and add "out_trace" label to avoid the
> multiple copies of the cleanup code in each error case.
>
> Signed-off-by: zhengliang <zhengliang6@xxxxxxxxxx>
Thanks for the patch. It looks good.
Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
> ---
> fs/ext4/inode.c | 17 +++++++++--------
> 1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 10dd470876b3..6187c8880c02 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4163,7 +4163,7 @@ int ext4_truncate(struct inode *inode)
> trace_ext4_truncate_enter(inode);
>
> if (!ext4_can_truncate(inode))
> - return 0;
> + goto out_trace;
>
> if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
> ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
> @@ -4172,16 +4172,14 @@ int ext4_truncate(struct inode *inode)
> int has_inline = 1;
>
> err = ext4_inline_data_truncate(inode, &has_inline);
> - if (err)
> - return err;
> - if (has_inline)
> - return 0;
> + if (err || has_inline)
> + goto out_trace;
> }
>
> /* If we zero-out tail of the page, we have to create jinode for jbd2 */
> if (inode->i_size & (inode->i_sb->s_blocksize - 1)) {
> if (ext4_inode_attach_jinode(inode) < 0)
> - return 0;
> + goto out_trace;
> }
>
> if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
> @@ -4190,8 +4188,10 @@ int ext4_truncate(struct inode *inode)
> credits = ext4_blocks_for_truncate(inode);
>
> handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
> - if (IS_ERR(handle))
> - return PTR_ERR(handle);
> + if (IS_ERR(handle)) {
> + err = PTR_ERR(handle);
> + goto out_trace;
> + }
>
> if (inode->i_size & (inode->i_sb->s_blocksize - 1))
> ext4_block_truncate_page(handle, mapping, inode->i_size);
> @@ -4242,6 +4242,7 @@ int ext4_truncate(struct inode *inode)
> err = err2;
> ext4_journal_stop(handle);
>
> +out_trace:
> trace_ext4_truncate_exit(inode);
> return err;
> }
> --
> 2.17.1
>
Cheers, Andreas
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