NFS: Fix nfs_set_page_dirty()
Be more careful about testing page->mapping.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 7975589..8593965 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1531,10 +1531,18 @@
int nfs_set_page_dirty(struct page *page)
{
- spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
+ struct address_space *mapping = page->mapping;
+ struct inode *inode;
+ spinlock_t *req_lock;
struct nfs_page *req;
int ret;
+ if (!mapping)
+ goto out_raced;
+ inode = mapping->host;
+ if (!inode)
+ goto out_raced;
+ req_lock = &NFS_I(inode)->req_lock;
spin_lock(req_lock);
req = nfs_page_find_request_locked(page);
if (req != NULL) {
@@ -1547,6 +1555,8 @@
ret = __set_page_dirty_nobuffers(page);
spin_unlock(req_lock);
return ret;
+out_raced:
+ return !TestSetPageDirty(page);
}