On Mar 18, 2020, at 1:19 PM, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote:
>
> From: Eric Sandeen <sandeen@xxxxxxxxxx>
>
> Under some circumstances we may encounter a filesystem error on a
> read-only block device, and if we try to save the error info to the
> superblock and commit it, we'll wind up with a noisy error and
> backtrace, i.e.:
>
> [ 3337.146838] EXT4-fs error (device pmem1p2): ext4_get_journal_inode:4634: comm mount: inode #0: comm mount: iget: illegal inode #
> ------------[ cut here ]------------
> generic_make_request: Trying to write to read-only block-device pmem1p2 (partno 2)
> WARNING: CPU: 107 PID: 115347 at block/blk-core.c:788 generic_make_request_checks+0x6b4/0x7d0
> ...
>
> To avoid this, commit the error info in the superblock only if the
> block device is writable.
>
> Reported-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
> ---
>
> (compile-tested only FWIW)
> (also, not sure if the bdev test in __save_error_info should be removed?)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 0c7c4adb664e..55392903bda5 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -372,7 +372,8 @@ static void save_error_info(struct super_block *sb, const char *func,
> unsigned int line)
> {
> __save_error_info(sb, func, line);
> - ext4_commit_super(sb, 1);
> + if (!bdev_read_only(sb->s_bdev))
> + ext4_commit_super(sb, 1);
> }
>
> /*
Cheers, Andreas
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