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sysfs: Basic support for multiple super blocks 

Add all of the necessary bioler plate to support
multiple superblocks in sysfs.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman 2010-03-30 11:31:24 -07:00 committed by Greg Kroah-Hartman
parent c3473c6354
commit 9e7fdd25b2
2 changed files with 59 additions and 2 deletions
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58
fs/sysfs/mount.c
View File

@ -72,16 +72,70 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
return 0;
}
static int sysfs_test_super(struct super_block *sb, void *data)
{
struct sysfs_super_info *sb_info = sysfs_info(sb);
struct sysfs_super_info *info = data;
int found = 1;
return found;
}
static int sysfs_set_super(struct super_block *sb, void *data)
{
int error;
error = set_anon_super(sb, data);
if (!error)
sb->s_fs_info = data;
return error;
}
static int sysfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_single(fs_type, flags, data, sysfs_fill_super, mnt);
struct sysfs_super_info *info;
struct super_block *sb;
int error;
error = -ENOMEM;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
goto out;
sb = sget(fs_type, sysfs_test_super, sysfs_set_super, info);
if (IS_ERR(sb) || sb->s_fs_info != info)
kfree(info);
if (IS_ERR(sb)) {
kfree(info);
error = PTR_ERR(sb);
goto out;
}
if (!sb->s_root) {
sb->s_flags = flags;
error = sysfs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (error) {
deactivate_locked_super(sb);
goto out;
}
sb->s_flags |= MS_ACTIVE;
}
simple_set_mnt(mnt, sb);
error = 0;
out:
return error;
}
static void sysfs_kill_sb(struct super_block *sb)
{
struct sysfs_super_info *info = sysfs_info(sb);
kill_anon_super(sb);
kfree(info);
}
static struct file_system_type sysfs_fs_type = {
.name = "sysfs",
.get_sb = sysfs_get_sb,
.kill_sb = kill_anon_super,
.kill_sb = sysfs_kill_sb,
};
int __init sysfs_init(void)

3
fs/sysfs/sysfs.h
View File

@ -114,6 +114,9 @@ struct sysfs_addrm_cxt {
/*
* mount.c
*/
struct sysfs_super_info {
};
#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
extern struct sysfs_dirent sysfs_root;
extern struct kmem_cache *sysfs_dir_cachep;