-stable review patch. If anyone has any objections, please let us know.
------------------
From: Nikita Danilov <[email protected]>
nfs_wb_page() waits on request completion and, as a result, is not safe to be
called from nfs_release_page() invoked by VM scanner as part of GFP_NOFS
allocation. Fix possible deadlock by analyzing gfp mask and refusing to
release page if __GFP_FS is not set.
Signed-off-by: Nikita Danilov <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/nfs/file.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- linux-2.6.17.13.orig/fs/nfs/file.c
+++ linux-2.6.17.13/fs/nfs/file.c
@@ -325,7 +325,13 @@ static void nfs_invalidate_page(struct p
static int nfs_release_page(struct page *page, gfp_t gfp)
{
- return !nfs_wb_page(page->mapping->host, page);
+ if (gfp & __GFP_FS)
+ return !nfs_wb_page(page->mapping->host, page);
+ else
+ /*
+ * Avoid deadlock on nfs_wait_on_request().
+ */
+ return 0;
}
struct address_space_operations nfs_file_aops = {
--
-
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