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authorChristoph Hellwig <hch@lst.de>2017-05-11 09:01:42 +0200
committerChristoph Hellwig <hch@lst.de>2017-06-05 16:59:05 +0200
commitef40dda5bbc310f6517082c0ff002913104358cd (patch)
treeac178c2745191dd43bcd32daa1de3b5616e39bf2
parentdf33767d9fe0ca93c606cc9042df05e5045c8158 (diff)
downloadlinux-ef40dda5bbc310f6517082c0ff002913104358cd.tar.bz2
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>
-rw-r--r--drivers/nvdimm/btt_devs.c9
-rw-r--r--include/linux/uuid.h13
-rw-r--r--lib/uuid.c5
3 files changed, 19 insertions, 8 deletions
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index ae00dc0d9791..4c989bb9a8a0 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -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;
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);
diff --git a/lib/uuid.c b/lib/uuid.c
index f7116ed88e01..680b9fb9ba09 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -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};