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| author | Eric W. Biederman <ebiederm@xmission.com> | 2010-03-30 20:31:24 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-21 18:37:30 +0200 |
| commit | 9e7fdd25b21ebf50713dfb7702af57c270e5572a (patch) | |
| tree | ea1c4d9c33be9b72782081fc16a5bac8aafe93da /fs/sysfs/mount.c | |
| parent | generate "change" uevent for loop device (diff) | |
| download | linux-9e7fdd25b21ebf50713dfb7702af57c270e5572a.tar.xz linux-9e7fdd25b21ebf50713dfb7702af57c270e5572a.zip | |
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>
Diffstat (limited to 'fs/sysfs/mount.c')
| -rw-r--r-- | fs/sysfs/mount.c | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 776137828dca..db0b1f2138af 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -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) |