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vfs: Export file system uuid via /proc/<pid>/mountinfo

Browse source 
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 <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Aneesh Kumar K.V 2011-01-29 18:43:38 +05:30 • committed by Al Viro
commit 93f1c20bc8
2 changed files with 17 additions and 0 deletions
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16
fs/namespace.c
View file

@ -1002,6 +1002,18 @@ const struct seq_operations mounts_op = {
.show = show_vfsmnt
};
static int uuid_is_nil(u8 *uuid)
{
int i;
u8 *cp = (u8 *)uuid;
for (i = 0; i < 16; i++) {
if (*cp++)
return 0;
}
return 1;
}
static int show_mountinfo(struct seq_file *m, void *v)
{
struct proc_mounts *p = m->private;
@ -1040,6 +1052,10 @@ static int show_mountinfo(struct seq_file *m, void *v)
if (IS_MNT_UNBINDABLE(mnt))
seq_puts(m, " unbindable");
if (!uuid_is_nil(mnt->mnt_sb->s_uuid))
/* print the uuid */
seq_printf(m, " uuid:%pU", mnt->mnt_sb->s_uuid);
/* Filesystem specific data */
seq_puts(m, " - ");
show_type(m, sb);