From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755651Ab0C3Sbk (ORCPT ); Tue, 30 Mar 2010 14:31:40 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:57387 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754194Ab0C3Sbi (ORCPT ); Tue, 30 Mar 2010 14:31:38 -0400 From: "Eric W. Biederman" To: Greg Kroah-Hartman Cc: Kay Sievers , linux-kernel@vger.kernel.org, Tejun Heo , Cornelia Huck , linux-fsdevel@vger.kernel.org, Eric Dumazet , Benjamin LaHaise , Serge Hallyn , , "Eric W. Biederman" Subject: [PATCH 1/6] sysfs: Basic support for multiple super blocks Date: Tue, 30 Mar 2010 11:31:24 -0700 Message-Id: <1269973889-25260-1-git-send-email-ebiederm@xmission.com> X-Mailer: git-send-email 1.6.5.2.143.g8cc62 In-Reply-To: References: X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Rcpt-To: gregkh@suse.de, kay.sievers@vrfy.org, linux-kernel@vger.kernel.org, tj@kernel.org, cornelia.huck@de.ibm.com, linux-fsdevel@vger.kernel.org, eric.dumazet@gmail.com, bcrl@lhnet.ca, serue@us.ibm.com, netdev@vger.kernel.org, ebiederm@xmission.com X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Scanned: No (on in02.mta.xmission.com); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric W. Biederman Add all of the necessary bioler plate to support multiple superblocks in sysfs. Signed-off-by: Eric W. Biederman --- fs/sysfs/mount.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++- fs/sysfs/sysfs.h | 3 ++ 2 files changed, 59 insertions(+), 2 deletions(-) diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 0cb1088..6a433ac 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -71,16 +71,70 @@ 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) diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index 30f5a44..030a39d 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -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; -- 1.6.5.2.143.g8cc62