--On 09/05/00 21:35:13 -0400 Chris Mason <mason@suse.com> wrote:
>
> Ok, hopefully this will make sense...
>
> __block_commit_write calls balance_dirty, which might wait on bdflush,
> running all the io on the page. The async_end_io handlers will unlock
> the page once io on all the buffer heads is done.
>
> So, by the time generic_file_write (or the new truncate code) calls
> UnlockPage, the page could have been unlocked by i/o, and relocked by
> another process.
>
> Or am I missing something?
>
Ah, I was missing that __block_prepare_write and __block_write_fullpage
both set the end_io handler to end_io_sync. In one case, reiserfs is doing
i/o without properly setting the handler, which is why I was seeing bugs
caused by the above problem, and ext2 wasn't.
-chris
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