NFS: Ensure that we mark the inode as dirty if we exit early from commit

If we exit from nfs_commit_inode() without ensuring that the COMMIT rpc
call has been completed, we must re-mark the inode as dirty. Otherwise,
future calls to sync_inode() with the WB_SYNC_ALL flag set will fail to
ensure that the data is on the disk.

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

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 3aea3ca..b8a6d7a 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1386,7 +1386,7 @@ static int nfs_commit_inode(struct inode *inode, int how)
        int res = 0;
 
        if (!nfs_commit_set_lock(NFS_I(inode), may_wait))
-               goto out;
+               goto out_mark_dirty;
        spin_lock(&inode->i_lock);
        res = nfs_scan_commit(inode, &head, 0, 0);
        spin_unlock(&inode->i_lock);
@@ -1398,9 +1398,18 @@ static int nfs_commit_inode(struct inode *inode, int how)
                        wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT,
                                        nfs_wait_bit_killable,
                                        TASK_KILLABLE);
+               else
+                       goto out_mark_dirty;
        } else
                nfs_commit_clear_lock(NFS_I(inode));
-out:
+       return res;
+       /* Note: If we exit without ensuring that the commit is complete,
+        * we must mark the inode as dirty. Otherwise, future calls to
+        * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
+        * that the data is on the disk.
+        */
+out_mark_dirty:
+       __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
        return res;
 }