NFS: Don't clear PG_writeback until after we've processed unstable writes

Ensure that we don't release the PG_writeback lock until after the page has
either been redirtied, or queued on the nfs_inode 'commit' list.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 3ed4feb..8e94246 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -920,8 +920,8 @@ out_bad:
                list_del(&data->pages);
                nfs_writedata_release(data);
        }
-       nfs_end_page_writeback(req->wb_page);
        nfs_redirty_request(req);
+       nfs_end_page_writeback(req->wb_page);
        nfs_clear_page_writeback(req);
        return -ENOMEM;
 }
@@ -966,8 +966,8 @@ static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
        while (!list_empty(head)) {
                struct nfs_page *req = nfs_list_entry(head->next);
                nfs_list_remove_request(req);
-               nfs_end_page_writeback(req->wb_page);
                nfs_redirty_request(req);
+               nfs_end_page_writeback(req->wb_page);
                nfs_clear_page_writeback(req);
        }
        return -ENOMEM;
@@ -1002,8 +1002,8 @@ out_err:
        while (!list_empty(head)) {
                req = nfs_list_entry(head->next);
                nfs_list_remove_request(req);
-               nfs_end_page_writeback(req->wb_page);
                nfs_redirty_request(req);
+               nfs_end_page_writeback(req->wb_page);
                nfs_clear_page_writeback(req);
        }
        return error;