6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Kaiser <martin@xxxxxxxxx>
[ Upstream commit b322bf9e983addedff0894c55e92d58f4d16d92a ]
With newer kernels that use fs_context for nfs mounts, remounts fail with
-EINVAL.
$ mount -t nfs -o nolock 10.0.0.1:/tmp/test /mnt/test/
$ mount -t nfs -o remount /mnt/test/
mount: mounting 10.0.0.1:/tmp/test on /mnt/test failed: Invalid argument
For remounts, the nfs server address and port are populated by
nfs_init_fs_context and later overwritten with 0x00 bytes by
nfs23_parse_monolithic. The remount then fails as the server address is
invalid.
Fix this by not overwriting nfs server info in nfs23_parse_monolithic if
we're doing a remount.
Fixes: f2aedb713c28 ("NFS: Add fs_context support.")
Signed-off-by: Martin Kaiser <martin@xxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/nfs/fs_context.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 853e8d609bb3b..41126d6dcd760 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -1111,9 +1111,12 @@ static int nfs23_parse_monolithic(struct fs_context *fc,
ctx->acdirmax = data->acdirmax;
ctx->need_mount = false;
- memcpy(sap, &data->addr, sizeof(data->addr));
- ctx->nfs_server.addrlen = sizeof(data->addr);
- ctx->nfs_server.port = ntohs(data->addr.sin_port);
+ if (!is_remount_fc(fc)) {
+ memcpy(sap, &data->addr, sizeof(data->addr));
+ ctx->nfs_server.addrlen = sizeof(data->addr);
+ ctx->nfs_server.port = ntohs(data->addr.sin_port);
+ }
+
if (sap->ss_family != AF_INET ||
!nfs_verify_server_address(sap))
goto out_no_address;
--
2.43.0
