On Feb 13, 2024, at 3:16 AM, Jan Kara <jack@xxxxxxx> wrote:
>
> When ext4 is mounted without journal, with discard mount option, and on
> a device not supporting trim, we print error for each and every freed
> extent. This is not only useless but actively harmful. Instead ignore
> the EOPNOTSUPP error. Trim is only advisory anyway and when the
> filesystem has journal we silently ignore trim error as well.
>
> Signed-off-by: Jan Kara <jack@xxxxxxx>
> ---
> fs/ext4/mballoc.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index e4f7cf9d89c4..aed620cf4d40 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -6488,7 +6488,13 @@ static void ext4_mb_clear_bb(handle_t *handle, struct inode *inode,
> if (test_opt(sb, DISCARD)) {
> err = ext4_issue_discard(sb, block_group, bit,
> count_clusters, NULL);
> - if (err && err != -EOPNOTSUPP)
> + /*
> + * Ignore EOPNOTSUPP error. This is consistent with
> + * what happens when using journal.
> + */
> + if (err == -EOPNOTSUPP)
> + err = 0;
> + if (err)
I don't see how this patch is actually changing whether the error message
is printed? Previously, if "err" was set and err was -EOPNOTSUPP the
message was skipped. Now it is doing the same thing in a different way?
The "err" value is overwritten 50 lines later on without being used:
err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
so the setting "err = 0" doesn't really affect the later code either.
What am I missing?
Cheers, Andreas
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