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NFS: kswapd must not block in nfs_release_page

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See https://bugzilla.kernel.org/show_bug.cgi?id=16056

If other processes are blocked waiting for kswapd to free up some memory so
that they can make progress, then we cannot allow kswapd to block on those
processes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
This commit is contained in:
Trond Myklebust
2010-07-30 15:31:54 -04:00
parent 674b222292
commit b608b283a9
3 changed files with 14 additions and 4 deletions
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13
fs/nfs/file.c
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@@ -27,6 +27,7 @@
#include <linux/pagemap.h>
#include <linux/aio.h>
#include <linux/gfp.h>
#include <linux/swap.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -493,11 +494,19 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset)
*/
static int nfs_release_page(struct page *page, gfp_t gfp)
{
struct address_space *mapping = page->mapping;
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
/* Only do I/O if gfp is a superset of GFP_KERNEL */
if ((gfp & GFP_KERNEL) == GFP_KERNEL)
nfs_wb_page(page->mapping->host, page);
if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
int how = FLUSH_SYNC;
/* Don't let kswapd deadlock waiting for OOM RPC calls */
if (current_is_kswapd())
how = 0;
nfs_commit_inode(mapping->host, how);
}
/* If PagePrivate() is set, then the page is not freeable */
if (PagePrivate(page))
return 0;