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bpf: Implement show_options

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Implement the show_options superblock op for bpf as part of a bid to get
rid of s_options and generic_show_options() to make it easier to implement
a context-based mount where the mount options can be passed individually
over a file descriptor.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Alexei Starovoitov <ast@kernel.org>
cc: Daniel Borkmann <daniel@iogearbox.net>
cc: netdev@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2017-07-05 16:24:49 +01:00 committed by Al Viro
parent 604ecf4288
commit 4cc7c1864b
1 changed files with 13 additions and 3 deletions
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16
kernel/bpf/inode.c
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@ -377,10 +377,22 @@ static void bpf_evict_inode(struct inode *inode)
bpf_any_put(inode->i_private, type);
}
/*
* Display the mount options in /proc/mounts.
*/
static int bpf_show_options(struct seq_file *m, struct dentry *root)
{
umode_t mode = d_inode(root)->i_mode & S_IALLUGO & ~S_ISVTX;
if (mode != S_IRWXUGO)
seq_printf(m, ",mode=%o", mode);
return 0;
}
static const struct super_operations bpf_super_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.show_options = generic_show_options,
.show_options = bpf_show_options,
.evict_inode = bpf_evict_inode,
};
@ -434,8 +446,6 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode;
int ret;
save_mount_options(sb, data);
ret = bpf_parse_options(data, &opts);
if (ret)
return ret;