NFSv4.1: Add a helper pnfs_commit_and_return_layout

[pandora-kernel.git] / fs / nfs / pnfs.c

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5044142..4bdffe0 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -866,6 +866,33 @@ out:
 }
 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
 
+int
+pnfs_commit_and_return_layout(struct inode *inode)
+{
+       struct pnfs_layout_hdr *lo;
+       int ret;
+
+       spin_lock(&inode->i_lock);
+       lo = NFS_I(inode)->layout;
+       if (lo == NULL) {
+               spin_unlock(&inode->i_lock);
+               return 0;
+       }
+       pnfs_get_layout_hdr(lo);
+       /* Block new layoutgets and read/write to ds */
+       lo->plh_block_lgets++;
+       spin_unlock(&inode->i_lock);
+       filemap_fdatawait(inode->i_mapping);
+       ret = pnfs_layoutcommit_inode(inode, true);
+       if (ret == 0)
+               ret = _pnfs_return_layout(inode);
+       spin_lock(&inode->i_lock);
+       lo->plh_block_lgets--;
+       spin_unlock(&inode->i_lock);
+       pnfs_put_layout_hdr(lo);
+       return ret;
+}
+
 bool pnfs_roc(struct inode *ino)
 {
        struct pnfs_layout_hdr *lo;