summaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2019-03-22 14:58:36 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2019-09-18 22:35:31 -0400
commitd2935de7e4fd3f873976f1872b505584b727574c (patch)
tree5ce5f81e7dc438257ffab0342c37d5c870a9c6e5 /kernel
parent74983ac20aeafc88d9ceed64a8bf2a9024c488d5 (diff)
vfs: Convert bpf to use the new mount API
Convert the bpf filesystem to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Signed-off-by: David Howells <dhowells@redhat.com> cc: Alexei Starovoitov <ast@kernel.org> cc: Daniel Borkmann <daniel@iogearbox.net> cc: Martin KaFai Lau <kafai@fb.com> cc: Song Liu <songliubraving@fb.com> cc: Yonghong Song <yhs@fb.com> cc: netdev@vger.kernel.org cc: bpf@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/inode.c92
1 files changed, 58 insertions, 34 deletions
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index cc0d0cf114e3..a70f7209cda3 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -14,8 +14,9 @@
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include <linux/kdev_t.h>
-#include <linux/parser.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
@@ -583,58 +584,52 @@ static const struct super_operations bpf_super_ops = {
enum {
OPT_MODE,
- OPT_ERR,
};
-static const match_table_t bpf_mount_tokens = {
- { OPT_MODE, "mode=%o" },
- { OPT_ERR, NULL },
+static const struct fs_parameter_spec bpf_param_specs[] = {
+ fsparam_u32oct ("mode", OPT_MODE),
+ {}
+};
+
+static const struct fs_parameter_description bpf_fs_parameters = {
+ .name = "bpf",
+ .specs = bpf_param_specs,
};
struct bpf_mount_opts {
umode_t mode;
};
-static int bpf_parse_options(char *data, struct bpf_mount_opts *opts)
+static int bpf_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
- substring_t args[MAX_OPT_ARGS];
- int option, token;
- char *ptr;
+ struct bpf_mount_opts *opts = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
- opts->mode = S_IRWXUGO;
-
- while ((ptr = strsep(&data, ",")) != NULL) {
- if (!*ptr)
- continue;
-
- token = match_token(ptr, bpf_mount_tokens, args);
- switch (token) {
- case OPT_MODE:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->mode = option & S_IALLUGO;
- break;
+ opt = fs_parse(fc, &bpf_fs_parameters, param, &result);
+ if (opt < 0)
/* We might like to report bad mount options here, but
* traditionally we've ignored all mount options, so we'd
* better continue to ignore non-existing options for bpf.
*/
- }
+ return opt == -ENOPARAM ? 0 : opt;
+
+ switch (opt) {
+ case OPT_MODE:
+ opts->mode = result.uint_32 & S_IALLUGO;
+ break;
}
return 0;
}
-static int bpf_fill_super(struct super_block *sb, void *data, int silent)
+static int bpf_fill_super(struct super_block *sb, struct fs_context *fc)
{
static const struct tree_descr bpf_rfiles[] = { { "" } };
- struct bpf_mount_opts opts;
+ struct bpf_mount_opts *opts = fc->fs_private;
struct inode *inode;
int ret;
- ret = bpf_parse_options(data, &opts);
- if (ret)
- return ret;
-
ret = simple_fill_super(sb, BPF_FS_MAGIC, bpf_rfiles);
if (ret)
return ret;
@@ -644,21 +639,50 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
inode = sb->s_root->d_inode;
inode->i_op = &bpf_dir_iops;
inode->i_mode &= ~S_IALLUGO;
- inode->i_mode |= S_ISVTX | opts.mode;
+ inode->i_mode |= S_ISVTX | opts->mode;
return 0;
}
-static struct dentry *bpf_mount(struct file_system_type *type, int flags,
- const char *dev_name, void *data)
+static int bpf_get_tree(struct fs_context *fc)
+{
+ return get_tree_nodev(fc, bpf_fill_super);
+}
+
+static void bpf_free_fc(struct fs_context *fc)
{
- return mount_nodev(type, flags, data, bpf_fill_super);
+ kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations bpf_context_ops = {
+ .free = bpf_free_fc,
+ .parse_param = bpf_parse_param,
+ .get_tree = bpf_get_tree,
+};
+
+/*
+ * Set up the filesystem mount context.
+ */
+static int bpf_init_fs_context(struct fs_context *fc)
+{
+ struct bpf_mount_opts *opts;
+
+ opts = kzalloc(sizeof(struct bpf_mount_opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+
+ opts->mode = S_IRWXUGO;
+
+ fc->fs_private = opts;
+ fc->ops = &bpf_context_ops;
+ return 0;
}
static struct file_system_type bpf_fs_type = {
.owner = THIS_MODULE,
.name = "bpf",
- .mount = bpf_mount,
+ .init_fs_context = bpf_init_fs_context,
+ .parameters = &bpf_fs_parameters,
.kill_sb = kill_litter_super,
};