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affs: Implement show_options

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Implement the show_options superblock op for affs 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 16:25:16 +01:00 committed by Al Viro
parent 3ab7947ac3
commit 26a7655e6a
1 changed files with 37 additions and 5 deletions
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42
fs/affs/super.c
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@ -20,9 +20,11 @@
#include <linux/slab.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include "affs.h"
static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int affs_show_options(struct seq_file *m, struct dentry *root);
static int affs_remount (struct super_block *sb, int *flags, char *data);
static void
@ -159,7 +161,7 @@ static const struct super_operations affs_sops = {
.sync_fs = affs_sync_fs,
.statfs = affs_statfs,
.remount_fs = affs_remount,
.show_options = generic_show_options,
.show_options = affs_show_options,
};
enum {
@ -293,6 +295,40 @@ parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved,
return 1;
}
static int affs_show_options(struct seq_file *m, struct dentry *root)
{
struct super_block *sb = root->d_sb;
struct affs_sb_info *sbi = AFFS_SB(sb);
if (sb->s_blocksize)
seq_printf(m, ",bs=%lu", sb->s_blocksize);
if (affs_test_opt(sbi->s_flags, SF_SETMODE))
seq_printf(m, ",mode=%o", sbi->s_mode);
if (affs_test_opt(sbi->s_flags, SF_MUFS))
seq_puts(m, ",mufs");
if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
seq_puts(m, ",nofilenametruncate");
if (affs_test_opt(sbi->s_flags, SF_PREFIX))
seq_printf(m, ",prefix=%s", sbi->s_prefix);
if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
seq_puts(m, ",protect");
if (sbi->s_reserved != 2)
seq_printf(m, ",reserved=%u", sbi->s_reserved);
if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
seq_printf(m, ",root=%u", sbi->s_root_block);
if (affs_test_opt(sbi->s_flags, SF_SETGID))
seq_printf(m, ",setgid=%u",
from_kgid_munged(&init_user_ns, sbi->s_gid));
if (affs_test_opt(sbi->s_flags, SF_SETUID))
seq_printf(m, ",setuid=%u",
from_kuid_munged(&init_user_ns, sbi->s_uid));
if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
seq_puts(m, ",verbose");
if (sbi->s_volume[0])
seq_printf(m, ",volume=%s", sbi->s_volume);
return 0;
}
/* This function definitely needs to be split up. Some fine day I'll
* hopefully have the guts to do so. Until then: sorry for the mess.
*/
@ -316,8 +352,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
u8 sig[4];
int ret;
save_mount_options(sb, data);
pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
sb->s_magic = AFFS_SUPER_MAGIC;
@ -548,8 +582,6 @@ affs_remount(struct super_block *sb, int *flags, char *data)
}
flush_delayed_work(&sbi->sb_work);
if (new_opts)
replace_mount_options(sb, new_opts);
sbi->s_flags = mount_flags;
sbi->s_mode = mode;