NFS: Don't use ClearPageUptodate() when writeback fails

ClearPageUptodate() will just cause races here. What we really want to do
is to invalidate the page cache.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index dea1737..febdade 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -153,6 +153,13 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c
        i_size_write(inode, end);
 }
 
+/* A writeback failed: mark the page as bad, and invalidate the page cache */
+static void nfs_set_pageerror(struct page *page)
+{
+       SetPageError(page);
+       nfs_zap_mapping(page->mapping->host, page->mapping);
+}
+
 /* We can set the PG_uptodate flag if we see that a write request
  * covers the full page.
  */
@@ -714,7 +721,7 @@ int nfs_updatepage(struct file *file, struct page *page,
         dprintk("NFS:      nfs_updatepage returns %d (isize %Ld)\n",
                        status, (long long)i_size_read(inode));
        if (status < 0)
-               ClearPageUptodate(page);
+               nfs_set_pageerror(page);
        return status;
 }
 
@@ -976,8 +983,7 @@ static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
                return;
 
        if (task->tk_status < 0) {
-               ClearPageUptodate(page);
-               SetPageError(page);
+               nfs_set_pageerror(page);
                req->wb_context->error = task->tk_status;
                dprintk(", error = %d\n", task->tk_status);
        } else {
@@ -1034,8 +1040,7 @@ static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
                        (long long)req_offset(req));
 
                if (task->tk_status < 0) {
-                       ClearPageUptodate(page);
-                       SetPageError(page);
+                       nfs_set_pageerror(page);
                        req->wb_context->error = task->tk_status;
                        end_page_writeback(page);
                        nfs_inode_remove_request(req);