Re: [PATCH] filemap_fdatasync & related changes

[Christoph Rohland <cr@sap.com>]

Chris Mason <mason@suse.com> writes:
> Just noticed the filemap_fdatasync code doesn't check the return value from
> writepage.  Linus, would you take a patch that redirtied the page, puts it
> back onto the dirty list (at the tail), and unlocks the page when writepage
> returns 1?
> 
> That would loop forever if the writepage func kept returning 1 though...I
> think that's what we want, unless someone like ramfs made a writepage func
> that always returned 1.

shmem has such a writepage for locked shm segments. It also always
return 1 if the swap space is exhausted. So everybody using shared
anonymous, SYSV shared or POSIX shared memory can hit this.

I invented the return code 1 exactly to be able to handle this.

Greetings
                Chris

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