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

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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@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Aneesh Kumar K.V
2011-01-29 18:43:38 +05:30
committed by Al Viro
parent a51571ccb8
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 .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) static int show_mountinfo(struct seq_file *m, void *v)
{ {
struct proc_mounts *p = m->private; 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)) if (IS_MNT_UNBINDABLE(mnt))
seq_puts(m, " unbindable"); 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 */ /* Filesystem specific data */
seq_puts(m, " - "); seq_puts(m, " - ");
show_type(m, sb); show_type(m, sb);

1
include/linux/fs.h
View File

@@ -1408,6 +1408,7 @@ struct super_block {
wait_queue_head_t s_wait_unfrozen; wait_queue_head_t s_wait_unfrozen;
char s_id[32]; /* Informational name */ char s_id[32]; /* Informational name */
u8 s_uuid[16]; /* UUID */
void *s_fs_info; /* Filesystem private info */ void *s_fs_info; /* Filesystem private info */
fmode_t s_mode; fmode_t s_mode;