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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>
This commit is contained in:
Christoph Hellwig 2017-05-11 09:01:42 +02:00
parent df33767d9f
commit ef40dda5bb
3 changed files with 19 additions and 8 deletions
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9
drivers/nvdimm/btt_devs.c
View File

@ -222,13 +222,6 @@ struct device *nd_btt_create(struct nd_region *nd_region)
return dev;
}
static bool uuid_is_null(u8 *uuid)
{
static const u8 null_uuid[16];
return (memcmp(uuid, null_uuid, 16) == 0);
}
/**
* nd_btt_arena_is_valid - check if the metadata layout is valid
* @nd_btt: device with BTT geometry and backing device info
@ -249,7 +242,7 @@ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
return false;
if (!uuid_is_null(super->parent_uuid))
if (!guid_is_null((guid_t *)&super->parent_uuid))
if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
return false;

13
include/linux/uuid.h
View File

@ -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);

5
lib/uuid.c
View File

@ -21,6 +21,11 @@
#include <linux/uuid.h>
#include <linux/random.h>
const guid_t guid_null;
EXPORT_SYMBOL(guid_null);
const uuid_t uuid_null;
EXPORT_SYMBOL(uuid_null);
const u8 guid_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
const u8 uuid_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};