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@xxxxxxxxxx>
cc: Alexei Starovoitov <ast@xxxxxxxxxx>
cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
cc: netdev@xxxxxxxxxxxxxxx
---
kernel/bpf/inode.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 9bbd33497d3d..e833ed914358 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -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;
