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dm crypt: extract scatterlist processing 

dm-crypt: Use crypto ablkcipher interface

Move scatterlists to separate dm_crypt_struct and
pick out block processing from crypt_convert.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2008-02-08 02:11:04 +00:00 committed by Alasdair G Kergon
parent 899c95d36c
commit 01482b7671
1 changed files with 39 additions and 24 deletions
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63
drivers/md/dm-crypt.c
View File

@ -55,6 +55,11 @@ struct dm_crypt_io {
sector_t sector;
};
struct dm_crypt_request {
struct scatterlist sg_in;
struct scatterlist sg_out;
};
struct crypt_config;
struct crypt_iv_operations {
@ -339,6 +344,39 @@ static void crypt_convert_init(struct crypt_config *cc,
ctx->sector = sector + cc->iv_offset;
}
static int crypt_convert_block(struct crypt_config *cc,
struct convert_context *ctx)
{
struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
struct dm_crypt_request dmreq;
sg_init_table(&dmreq.sg_in, 1);
sg_set_page(&dmreq.sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
bv_in->bv_offset + ctx->offset_in);
sg_init_table(&dmreq.sg_out, 1);
sg_set_page(&dmreq.sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
bv_out->bv_offset + ctx->offset_out);
ctx->offset_in += 1 << SECTOR_SHIFT;
if (ctx->offset_in >= bv_in->bv_len) {
ctx->offset_in = 0;
ctx->idx_in++;
}
ctx->offset_out += 1 << SECTOR_SHIFT;
if (ctx->offset_out >= bv_out->bv_len) {
ctx->offset_out = 0;
ctx->idx_out++;
}
return crypt_convert_scatterlist(cc, &dmreq.sg_out, &dmreq.sg_in,
dmreq.sg_in.length,
bio_data_dir(ctx->bio_in) == WRITE,
ctx->sector);
}
/*
* Encrypt / decrypt data from one bio to another one (can be the same one)
*/
@ -349,30 +387,7 @@ static int crypt_convert(struct crypt_config *cc,
while(ctx->idx_in < ctx->bio_in->bi_vcnt &&
ctx->idx_out < ctx->bio_out->bi_vcnt) {
struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
struct scatterlist sg_in, sg_out;
sg_init_table(&sg_in, 1);
sg_set_page(&sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, bv_in->bv_offset + ctx->offset_in);
sg_init_table(&sg_out, 1);
sg_set_page(&sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, bv_out->bv_offset + ctx->offset_out);
ctx->offset_in += sg_in.length;
if (ctx->offset_in >= bv_in->bv_len) {
ctx->offset_in = 0;
ctx->idx_in++;
}
ctx->offset_out += sg_out.length;
if (ctx->offset_out >= bv_out->bv_len) {
ctx->offset_out = 0;
ctx->idx_out++;
}
r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
bio_data_dir(ctx->bio_in) == WRITE, ctx->sector);
r = crypt_convert_block(cc, ctx);
if (r < 0)
break;