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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2011-01-29 18:43:38 +0530 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-15 02:21:45 -0400 |
| commit | 93f1c20bc8cdb757be50566eff88d65c3b26881f (patch) | |
| tree | 15e812c8127ddd795b8112f76832f6411953be62 | |
| parent | a51571ccb8be1b88aea502ebba8350519682c16d (diff) | |
| download | lwn-93f1c20bc8cdb757be50566eff88d65c3b26881f.tar.gz lwn-93f1c20bc8cdb757be50566eff88d65c3b26881f.zip | |
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@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/namespace.c | 16 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index d1edf26025dc..dffe6f49ab93 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -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); diff --git a/include/linux/fs.h b/include/linux/fs.h index 3f64630c0e10..f2143e0942c2 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1408,6 +1408,7 @@ 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; |