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Merge branch 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull more mount API conversions from Al Viro:
 "Assorted conversions of options parsing to new API.

  gfs2 is probably the most serious one here; the rest is trivial stuff.

  Other things in what used to be #work.mount are going to wait for the
  next cycle (and preferably go via git trees of the filesystems
  involved)"

* 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  gfs2: Convert gfs2 to fs_context
  vfs: Convert spufs to use the new mount API
  vfs: Convert hypfs to use the new mount API
  hypfs: Fix error number left in struct pointer member
  vfs: Convert functionfs to use the new mount API
  vfs: Convert bpf to use the new mount API
This commit is contained in:
Linus Torvalds
2019-09-24 12:33:34 -07:00
parent 722e6f500a 1f52aa08d1
commit 0b36c9eed2
8 changed files with 748 additions and 758 deletions
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92
kernel/bpf/inode.c
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@@ -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 mount_nodev(type, flags, data, bpf_fill_super);
return get_tree_nodev(fc, bpf_fill_super);
}
static void bpf_free_fc(struct fs_context *fc)
{
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,
};