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| author | Andrew Morton <akpm@osdl.org> | 2005-11-16 15:07:01 -0800 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-01-06 14:58:38 -0500 |
| commit | 22905f775dd6a8b73be99826dcad07ceec00244b (patch) | |
| tree | 960c0ad3d10fa208a31b78256788f332e5ebdd48 /mm/page-writeback.c | |
| parent | d99cf9d679a520d67f81d805b7cb91c68e1847f0 (diff) | |
| download | lwn-22905f775dd6a8b73be99826dcad07ceec00244b.tar.gz lwn-22905f775dd6a8b73be99826dcad07ceec00244b.zip | |
identify multipage ->writepages() calls
NFS needs to be able to distinguish between single-page ->writepage() calls and
multipage ->writepages() calls.
For the single-page writepage calls NFS can kick off the I/O within the
context of ->writepage().
For multipage ->writepages calls, nfs_writepage() will leave the I/O pending
and nfs_writepages() will kick off the I/O when it all has been queued up
within NFS.
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 0166ea15c9ee..5240e426c1f7 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -550,11 +550,17 @@ void __init page_writeback_init(void) int do_writepages(struct address_space *mapping, struct writeback_control *wbc) { + int ret; + if (wbc->nr_to_write <= 0) return 0; + wbc->for_writepages = 1; if (mapping->a_ops->writepages) - return mapping->a_ops->writepages(mapping, wbc); - return generic_writepages(mapping, wbc); + ret = mapping->a_ops->writepages(mapping, wbc); + else + ret = generic_writepages(mapping, wbc); + wbc->for_writepages = 0; + return ret; } /** |