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Subject[PATCH 022 of 35] Teach dm-crypt to honour bi_offset and bi_size


Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./drivers/md/dm-crypt.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff .prev/drivers/md/dm-crypt.c ./drivers/md/dm-crypt.c
--- .prev/drivers/md/dm-crypt.c 2007-07-31 11:21:03.000000000 +1000
+++ ./drivers/md/dm-crypt.c 2007-07-31 11:21:12.000000000 +1000
@@ -49,6 +49,8 @@ struct convert_context {
unsigned int offset_out;
unsigned int idx_in;
unsigned int idx_out;
+ int len_in;
+ int len_out;
sector_t sector;
int write;
};
@@ -326,8 +328,10 @@ crypt_convert_init(struct crypt_config *
{
ctx->bio_in = bio_in;
ctx->bio_out = bio_out;
- ctx->offset_in = 0;
- ctx->offset_out = 0;
+ ctx->offset_in = bio_in->bi_offset;
+ ctx->offset_out = bio_out->bi_offset;
+ ctx->len_in = bio_in->bi_size;
+ ctx->len_out = bio_out->bi_size;
ctx->idx_in = 0;
ctx->idx_out = 0;
ctx->sector = sector + cc->iv_offset;
@@ -362,12 +366,18 @@ static int crypt_convert(struct crypt_co
ctx->offset_in = 0;
ctx->idx_in++;
}
+ ctx->len_in -= sg_in.length;
+ if (ctx->len_in <= 0)
+ ctx->idx_in = ctx->bio_in->bi_vcnt;

ctx->offset_out += sg_out.length;
if (ctx->offset_out >= bv_out->bv_len) {
ctx->offset_out = 0;
ctx->idx_out++;
}
+ ctx->len_out -= sg_in.length;
+ if (ctx->len_out <= 0)
+ ctx->idx_out = ctx->bio_out->bi_vcnt;

r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
ctx->write, ctx->sector);
@@ -605,6 +615,8 @@ static void process_write(struct dm_cryp

ctx.bio_out = clone;
ctx.idx_out = 0;
+ ctx.offset_out = clone->bi_offset;
+ ctx.len_out = clone->bi_size;

if (unlikely(crypt_convert(cc, &ctx) < 0)) {
crypt_free_buffer_pages(cc, clone, clone->bi_size);
-
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