[PATCH -V17 10/12] vfs: Export file system uuid via /proc/<pid>mountinfo
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From: Aneesh Kumar K.V on 19 Jul 2010 15:20 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(a)linux.vnet.ibm.com> --- fs/namespace.c | 16 ++++++++++++++++ include/linux/fs.h | 1 + 2 files changed, 17 insertions(+), 0 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 88058de..b43b33c 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -833,6 +833,18 @@ 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; @@ -871,6 +883,10 @@ 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 b791159..8c064d7 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1366,6 +1366,7 @@ 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.rc3.43.g24e7a -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |