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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-10-04 17:59:08 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-10-19 19:37:54 -0400
commitbc4866b6e0b44f8ea0df22a16e5927714beb4983 (patch)
treebe5249600ca096b2ea4cf0ad6d8eea73cdeed966 /fs/nfs/file.c
parent955a857e062642cd3ebe1dc7bb38c0f85d8f8f17 (diff)
downloadop-kernel-dev-bc4866b6e0b44f8ea0df22a16e5927714beb4983.zip
op-kernel-dev-bc4866b6e0b44f8ea0df22a16e5927714beb4983.tar.gz
NFS: Don't SIGBUS if nfs_vm_page_mkwrite races with a cache invalidation
In the case where we lock the page, and then find out that the page has been thrown out of the page cache, we should just return VM_FAULT_NOPAGE. This is what block_page_mkwrite() does in these situations. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
Diffstat (limited to 'fs/nfs/file.c')
-rw-r--r--fs/nfs/file.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 59cbe1b..39672b7 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -551,7 +551,7 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
struct file *filp = vma->vm_file;
struct dentry *dentry = filp->f_path.dentry;
unsigned pagelen;
- int ret = -EINVAL;
+ int ret = VM_FAULT_NOPAGE;
struct address_space *mapping;
dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
@@ -567,21 +567,20 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
if (mapping != dentry->d_inode->i_mapping)
goto out_unlock;
- ret = 0;
pagelen = nfs_page_length(page);
if (pagelen == 0)
goto out_unlock;
- ret = nfs_flush_incompatible(filp, page);
- if (ret != 0)
- goto out_unlock;
+ ret = VM_FAULT_LOCKED;
+ if (nfs_flush_incompatible(filp, page) == 0 &&
+ nfs_updatepage(filp, page, 0, pagelen) == 0)
+ goto out;
- ret = nfs_updatepage(filp, page, 0, pagelen);
+ ret = VM_FAULT_SIGBUS;
out_unlock:
- if (!ret)
- return VM_FAULT_LOCKED;
unlock_page(page);
- return VM_FAULT_SIGBUS;
+out:
+ return ret;
}
static const struct vm_operations_struct nfs_file_vm_ops = {
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