Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1639002
| From | Christoph Hellwig <hch@lst.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 05/16] uuid: add the v1 layout to uuid_t |
| Date | 2017-05-10 20:10 +0200 |
| Message-ID | <tFEdI-40t-25@gated-at.bofh.it> (permalink) |
| References | <tFEdH-40t-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Turn the content of uuid_t into a union and add the fields for the v1
interpretation to it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
include/uapi/linux/uuid.h | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/uuid.h b/include/uapi/linux/uuid.h
index 1a2914d8b225..1039d2f3e114 100644
--- a/include/uapi/linux/uuid.h
+++ b/include/uapi/linux/uuid.h
@@ -25,7 +25,34 @@ typedef struct {
} guid_t;
typedef struct {
- __u8 b[16];
+ union {
+ __u8 b[16];
+
+ /*
+ * V1 (time-based) UUID definition [RFC 4122]:
+ * - the timestamp is a 60-bit value, split 32/16/12, and goes
+ * in 100ns increments since midnight 15th October 1582
+ * - add UUID_TO_UNIX_TIME to convert unix time in 100ns
+ * units to UUID time
+ * - the clock sequence is a 14-bit counter to avoid duplicate
+ * times
+ */
+ struct {
+ __be32 time_low;
+ __be16 time_mid;
+ __be16 time_hi_and_version;
+#define UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
+#define UUID_TIMEHI_MASK 0x0fff
+#define UUID_VERSION_TIME 0x1000 /* time-based UUID */
+#define UUID_VERSION_NAME 0x3000 /* name-based UUID */
+#define UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
+ u8 clock_seq_hi_and_reserved;
+#define UUID_CLOCKHI_MASK 0x3f
+#define UUID_VARIANT_STD 0x80
+ u8 clock_seq_low;
+ u8 node[6];
+ } v1;
+ };
} uuid_t;
#define GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
--
2.11.0
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
cleanup UUID types Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 04/16] uuid: don't export guid_index and uuid_index Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 03/16] uuid: rename uuid types Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
Re: [PATCH 03/16] uuid: rename uuid types David Howells <dhowells@redhat.com> - 2017-05-10 20:30 +0200
Re: [PATCH 03/16] uuid: rename uuid types Andy Shevchenko <andriy.shevchenko@linux.intel.com> - 2017-05-11 13:40 +0200
Re: [PATCH 03/16] uuid: rename uuid types Amir Goldstein <amir73il@gmail.com> - 2017-05-10 21:20 +0200
Re: [PATCH 03/16] uuid: rename uuid types Christoph Hellwig <hch@lst.de> - 2017-05-11 10:00 +0200
Re: [PATCH 03/16] uuid: rename uuid types Amir Goldstein <amir73il@gmail.com> - 2017-05-11 10:40 +0200
[PATCH 02/16] xfs: use uuid_be to implement the uuid_t type Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 06/16] afs: switch to use uuid_t and uuid_gen Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
Re: [PATCH 06/16] afs: switch to use uuid_t and uuid_gen David Howells <dhowells@redhat.com> - 2017-05-10 20:30 +0200
[PATCH 16/16] fs: switch ->s_uuid to uuid_t Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
Re: [PATCH 16/16] fs: switch ->s_uuid to uuid_t Amir Goldstein <amir73il@gmail.com> - 2017-05-10 21:10 +0200
Re: [PATCH 16/16] fs: switch ->s_uuid to uuid_t Christoph Hellwig <hch@lst.de> - 2017-05-11 10:00 +0200
[PATCH 13/16] block: remove blk_part_pack_uuid Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 14/16] block: remove blk_part_pack_uuid Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
Re: [PATCH 14/16] block: remove blk_part_pack_uuid Christoph Hellwig <hch@lst.de> - 2017-05-10 20:20 +0200
[PATCH 05/16] uuid: add the v1 layout to uuid_t Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
Re: [PATCH 05/16] uuid: add the v1 layout to uuid_t David Howells <dhowells@redhat.com> - 2017-05-10 20:30 +0200
Re: [PATCH 05/16] uuid: add the v1 layout to uuid_t Andy Shevchenko <andriy.shevchenko@linux.intel.com> - 2017-05-11 13:50 +0200
Re: [PATCH 05/16] uuid: add the v1 layout to uuid_t Christoph Hellwig <hch@lst.de> - 2017-05-11 14:10 +0200
[PATCH 01/16] xfs: use uuid_copy() helper to abstract uuid_t Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 09/16] md: namespace private helper names Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 12/16] xfs: use the common helper uuid_is_null() Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 08/16] xfs: remove uuid_getnodeuniq and xfs_uu_t Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 10/16] uuid: hoist helpers uuid_equal() and uuid_copy() from xfs Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
[PATCH 11/16] uuid: hoist uuid_is_null() helper from libnvdimm Christoph Hellwig <hch@lst.de> - 2017-05-10 20:10 +0200
csiph-web