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authorTrond Myklebust <Trond.Myklebust@netapp.com>2009-04-24 17:32:22 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-05-02 19:42:39 -0700
commit7fdf523067666b0eaff330f362401ee50ce187c4 (patch)
tree83088db2c3e9b61fd08bdcd0bbba5ace5a35b943
parentb4348f32dae3cb6eb4bc21c7ed8f76c0b11e9d6a (diff)
NFS: Close page_mkwrite() races
Follow up to Nick Piggin's patches to ensure that nfs_vm_page_mkwrite returns with the page lock held, and sets the VM_FAULT_LOCKED flag. See http://bugzilla.kernel.org/show_bug.cgi?id=12913 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/nfs/file.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 5a97bcfe03e..ec7e27d00bc 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -517,10 +517,10 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
ret = nfs_updatepage(filp, page, 0, pagelen);
out_unlock:
+ if (!ret)
+ return VM_FAULT_LOCKED;
unlock_page(page);
- if (ret)
- ret = VM_FAULT_SIGBUS;
- return ret;
+ return VM_FAULT_SIGBUS;
}
static struct vm_operations_struct nfs_file_vm_ops = {