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NFS: Don't SIGBUS if nfs_vm_page_mkwrite races with a cache invalidation

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commit bc4866b6e0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Trond Myklebust
2010-10-04 17:59:08 -04:00
committed by Greg Kroah-Hartman
parent a6b346485b
commit 34e1c8500c
1 changed files with 8 additions and 9 deletions
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17
fs/nfs/file.c
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@@ -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 = {