On Thu 18-07-24 19:53:36, libaokun@xxxxxxxxxxxxxxx wrote:
> From: Baokun Li <libaokun1@xxxxxxxxxx>
>
> In __jbd2_log_wait_for_space(), we might call jbd2_cleanup_journal_tail()
> to recover some journal space. But if an error occurs while executing
> jbd2_cleanup_journal_tail() (e.g., an EIO), we don't stop waiting for free
> space right away, we try other branches, and if j_committing_transaction
> is NULL (i.e., the tid is 0), we will get the following complain:
>
> ============================================
> JBD2: I/O error when updating journal superblock for sdd-8.
> __jbd2_log_wait_for_space: needed 256 blocks and only had 217 space available
> __jbd2_log_wait_for_space: no way to get more journal space in sdd-8
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 139804 at fs/jbd2/checkpoint.c:109 __jbd2_log_wait_for_space+0x251/0x2e0
> Modules linked in:
> CPU: 2 PID: 139804 Comm: kworker/u8:3 Not tainted 6.6.0+ #1
> RIP: 0010:__jbd2_log_wait_for_space+0x251/0x2e0
> Call Trace:
> <TASK>
> add_transaction_credits+0x5d1/0x5e0
> start_this_handle+0x1ef/0x6a0
> jbd2__journal_start+0x18b/0x340
> ext4_dirty_inode+0x5d/0xb0
> __mark_inode_dirty+0xe4/0x5d0
> generic_update_time+0x60/0x70
> [...]
> ============================================
>
> So only if jbd2_cleanup_journal_tail() returns 1, i.e., there is nothing to
> clean up at the moment, continue to try to reclaim free space in other ways.
>
> Note that this fix relies on commit 6f6a6fda2945 ("jbd2: fix ocfs2 corrupt
> when updating journal superblock fails") to make jbd2_cleanup_journal_tail
> return the correct error code.
>
> Fixes: 8c3f25d8950c ("jbd2: don't give up looking for space so easily in __jbd2_log_wait_for_space")
> Cc: stable@xxxxxxxxxx
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> fs/jbd2/checkpoint.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
> index 951f78634adf..7b593591273a 100644
> --- a/fs/jbd2/checkpoint.c
> +++ b/fs/jbd2/checkpoint.c
> @@ -86,8 +86,11 @@ __releases(&journal->j_state_lock)
> write_unlock(&journal->j_state_lock);
> if (chkpt) {
> jbd2_log_do_checkpoint(journal);
> - } else if (jbd2_cleanup_journal_tail(journal) == 0) {
> - /* We were able to recover space; yay! */
> + } else if (jbd2_cleanup_journal_tail(journal) <= 0) {
> + /*
> + * We were able to recover space or the
> + * journal was aborted due to an error.
> + */
> ;
> } else if (tid) {
> /*
> --
> 2.39.2
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
