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ramfs: Implement show_options

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Implement the show_options superblock op for ramfs 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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2017-07-05 16:24:42 +01:00 committed by Al Viro
parent 349d743895
commit 604ecf4288
1 changed files with 21 additions and 11 deletions
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32
fs/ramfs/inode.c
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@ -38,6 +38,14 @@
#include <linux/uaccess.h>
#include "internal.h"
struct ramfs_mount_opts {
umode_t mode;
};
struct ramfs_fs_info {
struct ramfs_mount_opts mount_opts;
};
#define RAMFS_DEFAULT_MODE 0755
static const struct super_operations ramfs_ops;
@ -149,14 +157,22 @@ static const struct inode_operations ramfs_dir_inode_operations = {
.rename = simple_rename,
};
/*
* Display the mount options in /proc/mounts.
*/
static int ramfs_show_options(struct seq_file *m, struct dentry *root)
{
struct ramfs_fs_info *fsi = root->d_sb->s_fs_info;
if (fsi->mount_opts.mode != RAMFS_DEFAULT_MODE)
seq_printf(m, ",mode=%o", fsi->mount_opts.mode);
return 0;
}
static const struct super_operations ramfs_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.show_options = generic_show_options,
};
struct ramfs_mount_opts {
umode_t mode;
.show_options = ramfs_show_options,
};
enum {
@ -169,10 +185,6 @@ static const match_table_t tokens = {
{Opt_err, NULL}
};
struct ramfs_fs_info {
struct ramfs_mount_opts mount_opts;
};
static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
{
substring_t args[MAX_OPT_ARGS];
@ -211,8 +223,6 @@ int ramfs_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode;
int err;
save_mount_options(sb, data);
fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
sb->s_fs_info = fsi;
if (!fsi)