diff options
| author | Andrew Morton <akpm@osdl.org> | 2005-11-17 02:07:01 +0300 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-01-06 22:58:38 +0300 |
| commit | 22905f775dd6a8b73be99826dcad07ceec00244b (patch) | |
| tree | 960c0ad3d10fa208a31b78256788f332e5ebdd48 | |
| parent | d99cf9d679a520d67f81d805b7cb91c68e1847f0 (diff) | |
| download | linux-22905f775dd6a8b73be99826dcad07ceec00244b.tar.xz | |
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>
| -rw-r--r-- | include/linux/writeback.h | 9 | ||||
| -rw-r--r-- | mm/page-writeback.c | 10 |
2 files changed, 13 insertions, 6 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 64a36ba43b2f..b096159086e8 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -53,10 +53,11 @@ struct writeback_control { loff_t start; loff_t end; - unsigned nonblocking:1; /* Don't get stuck on request queues */ - unsigned encountered_congestion:1; /* An output: a queue is full */ - unsigned for_kupdate:1; /* A kupdate writeback */ - unsigned for_reclaim:1; /* Invoked from the page allocator */ + unsigned nonblocking:1; /* Don't get stuck on request queues */ + unsigned encountered_congestion:1; /* An output: a queue is full */ + unsigned for_kupdate:1; /* A kupdate writeback */ + unsigned for_reclaim:1; /* Invoked from the page allocator */ + unsigned for_writepages:1; /* This is a writepages() call */ }; /* 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; } /** |