diff mbox series

[v3,2/3] NFSv3: Add emulation of the lookupp() operation

Message ID 20201020183718.14618-3-trondmy@kernel.org (mailing list archive)
State New, archived
Headers show
Series Add NFSv3 emulation of the lookupp operation | expand

Commit Message

Trond Myklebust Oct. 20, 2020, 6:37 p.m. UTC 
From: Trond Myklebust <trond.myklebust@hammerspace.com>

In order to use the open_by_filehandle() operations on NFSv3, we need
to be able to emulate lookupp() so that nfs_get_parent() can be used
to convert disconnected dentries into connected ones.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/nfs3proc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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Patch

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index acbdf7496d31..6b66b73a50eb 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -209,6 +209,20 @@  nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
 				  task_flags);
 }
 
+static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
+			     struct nfs_fattr *fattr, struct nfs4_label *label)
+{
+	const char dotdot[] = "..";
+	const size_t len = strlen(dotdot);
+	unsigned short task_flags = 0;
+
+	if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
+		task_flags |= RPC_TASK_TIMEOUT;
+
+	return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
+				  task_flags);
+}
+
 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 {
 	struct nfs3_accessargs	arg = {
@@ -1015,6 +1029,7 @@  const struct nfs_rpc_ops nfs_v3_clientops = {
 	.getattr	= nfs3_proc_getattr,
 	.setattr	= nfs3_proc_setattr,
 	.lookup		= nfs3_proc_lookup,
+	.lookupp	= nfs3_proc_lookupp,
 	.access		= nfs3_proc_access,
 	.readlink	= nfs3_proc_readlink,
 	.create		= nfs3_proc_create,