On Tue, 14 Dec 2010 14:56:18 +0530
Suresh Jayaraman <sjayaraman@xxxxxxx> wrote:
> On 12/10/2010 09:14 PM, Jeff Layton wrote:
> > If CIFSSMBWrite2 returns -EAGAIN, then the error should be considered
> > temporary. CIFS should retry the write instead of setting an error on
> > the mapping and returning.
> >
> > For WB_SYNC_ALL, just retry the write immediately.
> >
> > In the WB_SYNC_NONE case, call redirty_page_for_writeback on all of the
> > pages that didn't get written out and then move on.
> >
> > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> > ---
> > fs/cifs/file.c | 23 +++++++++++------------
> > 1 files changed, 11 insertions(+), 12 deletions(-)
> >
> > diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> > index fe16f6d..8e57370 100644
> > --- a/fs/cifs/file.c
> > +++ b/fs/cifs/file.c
> > @@ -1430,6 +1430,7 @@ retry:
> > break;
> > }
> > if (n_iov) {
> > +retry_write:
> > open_file = find_writable_file(CIFS_I(mapping->host),
> > false);
> > if (!open_file) {
> > @@ -1445,22 +1446,20 @@ retry:
> > cifs_update_eof(cifsi, offset, bytes_written);
> > }
> >
> > - if (rc || bytes_written < bytes_to_write) {
> > - cERROR(1, "Write2 ret %d, wrote %d",
> > - rc, bytes_written);
> > - mapping_set_error(mapping, rc);
> > - } else {
> > + /* retry on data-integrity flush */
> > + if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
> > + goto retry_write;
> > +
> > + if (!rc)
> > cifs_stats_bytes_written(tcon, bytes_written);
> > - }
> > + else if (rc != -EAGAIN)
> > + mapping_set_error(mapping, rc);
> >
> > for (i = 0; i < n_iov; i++) {
> > page = pvec.pages[first + i];
> > - /* Should we also set page error on
> > - success rc but too little data written? */
> > - /* BB investigate retry logic on temporary
> > - server crash cases and how recovery works
> > - when page marked as error */
> > - if (rc)
> > + if (rc == -EAGAIN)
> > + redirty_page_for_writepage(wbc, page);
> > + else if (rc != 0)
> > SetPageError(page);
> > kunmap(page);
> > unlock_page(page);
>
> Documentation/filesystems/Locking suggests that rc should be set to 0
> after redirtying?
>
>
Ahh good catch. I'll fix it.
Thanks,
--
Jeff Layton <jlayton@xxxxxxxxxx>
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