From: Martin Kaiser martin@kaiser.cx

mainline inclusion from mainline-v6.10-rc1 commit b322bf9e983addedff0894c55e92d58f4d16d92a bugzilla: https://gitee.com/src-openeuler/kernel/issues/IANSAC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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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@kaiser.cx Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Conflicts: fs/nfs/fs_context.c [Just context differences.] Signed-off-by: Yifan Qiao qiaoyifan4@huawei.com --- 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 d60c086c6e9c..327b9aaba4ea 100644 --- a/fs/nfs/fs_context.c +++ b/fs/nfs/fs_context.c @@ -962,9 +962,12 @@ 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->sa_family != AF_INET || !nfs_verify_server_address(sap)) goto out_no_address;