linux-kernel - [PATCH -V16 10/12] vfs: Export file system uuid via /proc/<pid>mountinfo

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Date:	Mon, 12 Jul 2010 12:05:43 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com,
	corbet@....net, neilb@...e.de, npiggin@...e.de,
	hooanon05@...oo.co.jp, bfields@...ldses.org
Cc:	linux-fsdevel@...r.kernel.org, sfrench@...ibm.com,
	philippe.deniel@....FR, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH -V16 10/12] vfs: Export file system uuid via /proc/<pid>mountinfo

We add a per superblock uuid field. File systems should
update the uuid in the fill_super callback

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/namespace.c     |    3 +++
 include/linux/fs.h |    1 +
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 88058de..5dbdbd6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -871,6 +871,9 @@ static int show_mountinfo(struct seq_file *m, void *v)
 	if (IS_MNT_UNBINDABLE(mnt))
 		seq_puts(m, " unbindable");
 
+	/* print the uuid */
+	seq_printf(m, " uuid:%pU", mnt->mnt_sb->s_uuid);
+
 	/* Filesystem specific data */
 	seq_puts(m, " - ");
 	show_type(m, sb);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3103c39..5f43472 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1367,6 +1367,7 @@ struct super_block {
 	wait_queue_head_t	s_wait_unfrozen;
 
 	char s_id[32];				/* Informational name */
+	u8 s_uuid[16];				/* UUID */
 
 	void 			*s_fs_info;	/* Filesystem private info */
 	fmode_t			s_mode;
-- 
1.7.2.rc1

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