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@xxxxxxxxxxxxxxxxxx>
---
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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