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dm crypt: simplify compatible table output 

Rename cc->cipher_mode to cc->cipher_string and store the whole of the cipher
information so it can easily be printed when processing the DM_DEV_STATUS ioctl.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2011-01-13 19:59:52 +00:00 committed by Alasdair G Kergon
parent 86a54a4802
commit 7dbcd13741
1 changed files with 12 additions and 16 deletions
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28
drivers/md/dm-crypt.c
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@ -108,7 +108,7 @@ struct crypt_config {
struct workqueue_struct *crypt_queue;
char *cipher;
char *cipher_mode;
char *cipher_string;
struct crypt_iv_operations *iv_gen_ops;
union {
@ -1030,7 +1030,7 @@ static void crypt_dtr(struct dm_target *ti)
dm_put_device(ti, cc->dev);
kzfree(cc->cipher);
kzfree(cc->cipher_mode);
kzfree(cc->cipher_string);
/* Must zero key material before freeing */
kzfree(cc);
@ -1050,6 +1050,10 @@ static int crypt_ctr_cipher(struct dm_target *ti,
return -EINVAL;
}
cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
if (!cc->cipher_string)
goto bad_mem;
/*
* Legacy dm-crypt cipher specification
* cipher-mode-iv:ivopts
@ -1061,12 +1065,6 @@ static int crypt_ctr_cipher(struct dm_target *ti,
if (!cc->cipher)
goto bad_mem;
if (tmp) {
cc->cipher_mode = kstrdup(tmp, GFP_KERNEL);
if (!cc->cipher_mode)
goto bad_mem;
}
chainmode = strsep(&tmp, "-");
ivopts = strsep(&tmp, "-");
ivmode = strsep(&ivopts, ":");
@ -1074,10 +1072,11 @@ static int crypt_ctr_cipher(struct dm_target *ti,
if (tmp)
DMWARN("Ignoring unexpected additional cipher options");
/* Compatibility mode for old dm-crypt mappings */
/*
* For compatibility with the original dm-crypt mapping format, if
* only the cipher name is supplied, use cbc-plain.
*/
if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) {
kfree(cc->cipher_mode);
cc->cipher_mode = kstrdup("cbc-plain", GFP_KERNEL);
chainmode = "cbc";
ivmode = "plain";
}
@ -1307,10 +1306,7 @@ static int crypt_status(struct dm_target *ti, status_type_t type,
break;
case STATUSTYPE_TABLE:
if (cc->cipher_mode)
DMEMIT("%s-%s ", cc->cipher, cc->cipher_mode);
else
DMEMIT("%s ", cc->cipher);
DMEMIT("%s ", cc->cipher_string);
if (cc->key_size > 0) {
if ((maxlen - sz) < ((cc->key_size << 1) + 1))
@ -1422,7 +1418,7 @@ static int crypt_iterate_devices(struct dm_target *ti,
static struct target_type crypt_target = {
.name = "crypt",
.version = {1, 7, 0},
.version = {1, 8, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,