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author | Christoph Hellwig <hch@lst.de> | 2017-05-11 09:01:42 +0200 |
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committer | Christoph Hellwig <hch@lst.de> | 2017-06-05 16:59:05 +0200 |
commit | ef40dda5bbc310f6517082c0ff002913104358cd (patch) | |
tree | ac178c2745191dd43bcd32daa1de3b5616e39bf2 /include/linux/uuid.h | |
parent | df33767d9fe0ca93c606cc9042df05e5045c8158 (diff) | |
download | linux-stable-ef40dda5bbc310f6517082c0ff002913104358cd.tar.gz linux-stable-ef40dda5bbc310f6517082c0ff002913104358cd.tar.bz2 linux-stable-ef40dda5bbc310f6517082c0ff002913104358cd.zip |
uuid: hoist uuid_is_null() helper from libnvdimm
Hoist the libnvdimm helper as an inline helper to linux/uuid.h
using an auxiliary const variable uuid_null in lib/uuid.c.
[hch: also add the guid variant. Both do the same but I'd like
to keep casts to a minimum]
The common helper uses the new abstract type uuid_t * instead of
u8 *.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
[hch: added guid_is_null]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'include/linux/uuid.h')
-rw-r--r-- | include/linux/uuid.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/uuid.h b/include/linux/uuid.h index 777f9cb01eb1..75f7182d5360 100644 --- a/include/linux/uuid.h +++ b/include/linux/uuid.h @@ -35,6 +35,9 @@ typedef struct { */ #define UUID_STRING_LEN 36 +extern const guid_t guid_null; +extern const uuid_t uuid_null; + static inline bool guid_equal(const guid_t *u1, const guid_t *u2) { return memcmp(u1, u2, sizeof(guid_t)) == 0; @@ -45,6 +48,11 @@ static inline void guid_copy(guid_t *dst, const guid_t *src) memcpy(dst, src, sizeof(guid_t)); } +static inline bool guid_is_null(guid_t *guid) +{ + return guid_equal(guid, &guid_null); +} + static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2) { return memcmp(u1, u2, sizeof(uuid_t)) == 0; @@ -55,6 +63,11 @@ static inline void uuid_copy(uuid_t *dst, const uuid_t *src) memcpy(dst, src, sizeof(uuid_t)); } +static inline bool uuid_is_null(uuid_t *uuid) +{ + return uuid_equal(uuid, &uuid_null); +} + void generate_random_uuid(unsigned char uuid[16]); extern void guid_gen(guid_t *u); |