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Subject[PATCH 24/25] fsinfo: bpf - add sb operation fsinfo() [ver #14]
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From: Ian Kent <raven@themaw.net>

The new fsinfo() system call adds a new super block operation
->fsinfo() which is used by file systems to provide file
system specific information for fsinfo() requests.

The fsinfo() request FSINFO_ATTR_PARAMETERS provides the same
function as sb operation ->show_options() so it needs to be
implemented by any file system that provides ->show_options()
as a minimum.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: David Howells <dhowells@redhat.com>
---

kernel/bpf/inode.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 6e22363054b1..8c3575eca976 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -23,6 +23,7 @@
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
+#include <linux/fsinfo.h>

enum bpf_type {
BPF_TYPE_UNSPEC = 0,
@@ -567,6 +568,27 @@ static int bpf_show_options(struct seq_file *m, struct dentry *root)
return 0;
}

+#ifdef CONFIG_FSINFO
+/*
+ * Get filesystem information.
+ */
+static int bpf_fsinfo(struct path *path, struct fsinfo_kparams *params)
+{
+ umode_t mode = d_inode(path->dentry)->i_mode & S_IALLUGO & ~S_ISVTX;
+
+ switch (params->request) {
+ case FSINFO_ATTR_PARAMETERS:
+ fsinfo_note_sb_params(params, path->dentry->d_sb->s_flags);
+ if (mode != S_IRWXUGO)
+ fsinfo_note_paramf(params, "mode", "%o", mode);
+ return params->usage;
+
+ default:
+ return generic_fsinfo(path, params);
+ }
+}
+#endif /* CONFIG_FSINFO */
+
static void bpf_free_inode(struct inode *inode)
{
enum bpf_type type;
@@ -583,6 +605,9 @@ static const struct super_operations bpf_super_ops = {
.drop_inode = generic_delete_inode,
.show_options = bpf_show_options,
.free_inode = bpf_free_inode,
+#ifdef CONFIG_FSINFO
+ .fsinfo = bpf_fsinfo,
+#endif
};

enum {
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