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

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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: Chuck Lever III <chuck.lever@oracle.com>
Fixes: 20fa190272 ("nfs: add export operations")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2022-08-25 14:49:05 -04:00
parent 17814819ac
commit 2a9d683b48
1 changed files with 18 additions and 9 deletions
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27
fs/nfs/super.c
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@ -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;