On Wed 02-04-14 10:36:30, Matthew Wilcox wrote:
>
> __ext4_handle_dirty_metadata can be called with a NULL inode, but
> ext4_error_inode can't. This is supposed to be a "can't happen" path,
> so we need to find out whether it can legitimately happen or whether
It can legitimately happen - there is metadata (like bitmaps, inode
table, group descriptor) which doesn't belong to any inode. Thus we leave
inode argument as NULL for these.
> there's some other bug that is causing this to happen. This prevents
> a NULL pointer reference, so it should be included regardless of what
> the underlying error is.
I'd prefer wrapping that several-line error into braces. But whatever.
Feel free to add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
>
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
> ---
> fs/ext4/ext4_jbd2.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
> index 3fe29de..383d586 100644
> --- a/fs/ext4/ext4_jbd2.c
> +++ b/fs/ext4/ext4_jbd2.c
> @@ -259,7 +259,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
> if (WARN_ON_ONCE(err)) {
> ext4_journal_abort_handle(where, line, __func__, bh,
> handle, err);
> - ext4_error_inode(inode, where, line,
> + if (inode)
> + ext4_error_inode(inode, where, line,
> bh->b_blocknr,
> "journal_dirty_metadata failed: "
> "handle type %u started at line %u, "
> --
> 1.9.0
>
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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