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crc-t10dif: clean up some more things 

- Correctly compare the algorithm name in crc_t10dif_notify().

- Use proper NOTIFY_* status codes instead of 0.

- Consistently use CRC_T10DIF_STRING instead of "crct10dif" directly.

- Use a proper type for the shash_desc context.

- Use crypto_shash_driver_name() instead of open-coding it.

- Make crc_t10dif_transform_show() use snprintf() rather than sprintf().
  This isn't actually necessary since the buffer has size PAGE_SIZE
  and CRYPTO_MAX_ALG_NAME < PAGE_SIZE, but it's good practice.

- Give the "transform" sysfs file mode 0444 rather than 0644,
  since it doesn't implement a setter method.

- Adjust the module description to not be the same as crct10dif-generic.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2020-06-09 23:39:43 -07:00 committed by Herbert Xu
parent be924e0aaa
commit 29195232fa
1 changed files with 11 additions and 13 deletions
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24
lib/crc-t10dif.c
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@ -26,11 +26,11 @@ static int crc_t10dif_notify(struct notifier_block *self, unsigned long val, voi
struct crypto_alg *alg = data; struct crypto_alg *alg = data;
if (val != CRYPTO_MSG_ALG_LOADED || if (val != CRYPTO_MSG_ALG_LOADED ||
strncmp(alg->cra_name, CRC_T10DIF_STRING, strlen(CRC_T10DIF_STRING))) strcmp(alg->cra_name, CRC_T10DIF_STRING))
return 0; return NOTIFY_DONE;
schedule_work(&crct10dif_rehash_work); schedule_work(&crct10dif_rehash_work);
return 0; return NOTIFY_OK;
} }
static void crc_t10dif_rehash(struct work_struct *work) static void crc_t10dif_rehash(struct work_struct *work)
@ -40,7 +40,7 @@ static void crc_t10dif_rehash(struct work_struct *work)
mutex_lock(&crc_t10dif_mutex); mutex_lock(&crc_t10dif_mutex);
old = rcu_dereference_protected(crct10dif_tfm, old = rcu_dereference_protected(crct10dif_tfm,
lockdep_is_held(&crc_t10dif_mutex)); lockdep_is_held(&crc_t10dif_mutex));
new = crypto_alloc_shash("crct10dif", 0, 0); new = crypto_alloc_shash(CRC_T10DIF_STRING, 0, 0);
if (IS_ERR(new)) { if (IS_ERR(new)) {
mutex_unlock(&crc_t10dif_mutex); mutex_unlock(&crc_t10dif_mutex);
return; return;
@ -64,7 +64,7 @@ __u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
{ {
struct { struct {
struct shash_desc shash; struct shash_desc shash;
char ctx[2]; __u16 crc;
} desc; } desc;
int err; int err;
@ -73,14 +73,13 @@ __u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
rcu_read_lock(); rcu_read_lock();
desc.shash.tfm = rcu_dereference(crct10dif_tfm); desc.shash.tfm = rcu_dereference(crct10dif_tfm);
*(__u16 *)desc.ctx = crc; desc.crc = crc;
err = crypto_shash_update(&desc.shash, buffer, len); err = crypto_shash_update(&desc.shash, buffer, len);
rcu_read_unlock(); rcu_read_unlock();
BUG_ON(err); BUG_ON(err);
return *(__u16 *)desc.ctx; return desc.crc;
} }
EXPORT_SYMBOL(crc_t10dif_update); EXPORT_SYMBOL(crc_t10dif_update);
@ -111,7 +110,6 @@ module_exit(crc_t10dif_mod_fini);
static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp) static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp)
{ {
struct crypto_shash *tfm; struct crypto_shash *tfm;
const char *name;
int len; int len;
if (static_branch_unlikely(&crct10dif_fallback)) if (static_branch_unlikely(&crct10dif_fallback))
@ -119,15 +117,15 @@ static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp
rcu_read_lock(); rcu_read_lock();
tfm = rcu_dereference(crct10dif_tfm); tfm = rcu_dereference(crct10dif_tfm);
name = crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm)); len = snprintf(buffer, PAGE_SIZE, "%s\n",
len = sprintf(buffer, "%s\n", name); crypto_shash_driver_name(tfm));
rcu_read_unlock(); rcu_read_unlock();
return len; return len;
} }
module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0644); module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0444);
MODULE_DESCRIPTION("T10 DIF CRC calculation"); MODULE_DESCRIPTION("T10 DIF CRC calculation (library API)");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_SOFTDEP("pre: crct10dif"); MODULE_SOFTDEP("pre: crct10dif");