Commit 2a9d683b authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Turn off open-by-filehandle and NFS re-export for NFSv4.0 



The NFSv4.0 protocol only supports open() by name. It cannot therefore
be used with open_by_handle() and friends, nor can it be re-exported by
knfsd.

Reported-by: default avatarChuck Lever III <chuck.lever@oracle.com>
Fixes: 20fa1902 ("nfs: add export operations")
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 17814819

fs/nfs/super.c

+18 −9
Original line number Diff line number Diff line
@@ -1051,22 +1051,31 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 
	if (ctx->bsize)

		sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);



	if (server->nfs_client->rpc_ops->version != 2) {

		/* The VFS shouldn't apply the umask to mode bits. We will do

		 * so ourselves when necessary.

	switch (server->nfs_client->rpc_ops->version) {

	case 2:

		sb->s_time_gran = 1000;

		sb->s_time_min = 0;

		sb->s_time_max = U32_MAX;

		break;

	case 3:

		/*

		 * The VFS shouldn't apply the umask to mode bits.

		 * We will do so ourselves when necessary.

		 */

		sb->s_flags |= SB_POSIXACL;

		sb->s_time_gran = 1;

		sb->s_export_op = &nfs_export_ops;

	} else

		sb->s_time_gran = 1000;



	if (server->nfs_client->rpc_ops->version != 4) {

		sb->s_time_min = 0;

		sb->s_time_max = U32_MAX;

	} else {

		sb->s_export_op = &nfs_export_ops;

		break;

	case 4:

		sb->s_flags |= SB_POSIXACL;

		sb->s_time_gran = 1;

		sb->s_time_min = S64_MIN;

		sb->s_time_max = S64_MAX;

		if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)

			sb->s_export_op = &nfs_export_ops;

		break;

	}



	sb->s_magic = NFS_SUPER_MAGIC;