On Mon, Nov 08, 2010 at 12:00:52AM -0500, Ted Ts'o wrote:
> On Mon, Nov 08, 2010 at 12:19:19PM +1100, Dave Chinner wrote:
> >
> > Doesn't this mean you are tossing away unwritten extent conversion
> > processing when IO is issued on any inode in the I_WILL_FREE/I_FREEING
> > state, or completing IO after the unmount is in progress?
>
> Yeah, thanks for pointing that out. Clearly I must have been
> sleep-deprived, since I had managed to convince myself we'd only end
> up in this situation when the inode had been deleted (as opposed to
> the situation where there's so much memory pressure that we're pushing
> out an inode that still has writebacks pending).
....
> @@ -254,9 +253,30 @@ static void ext4_end_bio(struct bio *bio, int error)
> if (!partial_write)
> SetPageUptodate(page);
> }
> -
> io_end->num_io_pages = 0;
>
> + if ((inode = io_end->inode) == NULL)
> + goto no_work;
> +
> + if (!(inode->i_sb->s_flags & MS_ACTIVE)) {
> + pr_err("sb umounted, discard end_io request for inode %lu\n",
> + io_end->inode->i_ino);
> + no_work:
> + ext4_free_io_end(io_end);
> + return;
> + }
These checks are no longer necessary.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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