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dm crypt: store crypt_config instead of dm_target struct 

Store the crypt_config struct pointer directly in struct dm_crypt_io
instead of the dm_target struct pointer.

Target information is never used - only target->private is referenced,
thus we can change it to point directly to struct crypt_config.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Alasdair G Kergon 2012-07-27 15:08:05 +01:00
parent fd2d231faf
commit 49a8a9204b
1 changed files with 18 additions and 20 deletions
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38
drivers/md/dm-crypt.c
View File

@ -50,7 +50,7 @@ struct convert_context {
* per bio private data
*/
struct dm_crypt_io {
struct dm_target *target;
struct crypt_config *cc;
struct bio *base_bio;
struct work_struct work;
@ -801,7 +801,7 @@ static int crypt_convert(struct crypt_config *cc,
static void dm_crypt_bio_destructor(struct bio *bio)
{
struct dm_crypt_io *io = bio->bi_private;
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
bio_free(bio, cc->bs);
}
@ -815,7 +815,7 @@ static void dm_crypt_bio_destructor(struct bio *bio)
static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size,
unsigned *out_of_pages)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
struct bio *clone;
unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM;
@ -874,14 +874,13 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
}
}
static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti,
static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc,
struct bio *bio, sector_t sector)
{
struct crypt_config *cc = ti->private;
struct dm_crypt_io *io;
io = mempool_alloc(cc->io_pool, GFP_NOIO);
io->target = ti;
io->cc = cc;
io->base_bio = bio;
io->sector = sector;
io->error = 0;
@ -903,7 +902,7 @@ static void crypt_inc_pending(struct dm_crypt_io *io)
*/
static void crypt_dec_pending(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
struct bio *base_bio = io->base_bio;
struct dm_crypt_io *base_io = io->base_io;
int error = io->error;
@ -942,7 +941,7 @@ static void crypt_dec_pending(struct dm_crypt_io *io)
static void crypt_endio(struct bio *clone, int error)
{
struct dm_crypt_io *io = clone->bi_private;
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
unsigned rw = bio_data_dir(clone);
if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error))
@ -969,7 +968,7 @@ static void crypt_endio(struct bio *clone, int error)
static void clone_init(struct dm_crypt_io *io, struct bio *clone)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
clone->bi_private = io;
clone->bi_end_io = crypt_endio;
@ -980,7 +979,7 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
struct bio *base_bio = io->base_bio;
struct bio *clone;
@ -1028,7 +1027,7 @@ static void kcryptd_io(struct work_struct *work)
static void kcryptd_queue_io(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
INIT_WORK(&io->work, kcryptd_io);
queue_work(cc->io_queue, &io->work);
@ -1037,7 +1036,7 @@ static void kcryptd_queue_io(struct dm_crypt_io *io)
static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
{
struct bio *clone = io->ctx.bio_out;
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
if (unlikely(io->error < 0)) {
crypt_free_buffer_pages(cc, clone);
@ -1059,7 +1058,7 @@ static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
struct bio *clone;
struct dm_crypt_io *new_io;
int crypt_finished;
@ -1125,7 +1124,7 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
* between fragments, so switch to a new dm_crypt_io structure.
*/
if (unlikely(!crypt_finished && remaining)) {
new_io = crypt_io_alloc(io->target, io->base_bio,
new_io = crypt_io_alloc(io->cc, io->base_bio,
sector);
crypt_inc_pending(new_io);
crypt_convert_init(cc, &new_io->ctx, NULL,
@ -1159,7 +1158,7 @@ static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
int r = 0;
crypt_inc_pending(io);
@ -1183,7 +1182,7 @@ static void kcryptd_async_done(struct crypto_async_request *async_req,
struct dm_crypt_request *dmreq = async_req->data;
struct convert_context *ctx = dmreq->ctx;
struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
if (error == -EINPROGRESS) {
complete(&ctx->restart);
@ -1219,7 +1218,7 @@ static void kcryptd_crypt(struct work_struct *work)
static void kcryptd_queue_crypt(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct crypt_config *cc = io->cc;
INIT_WORK(&io->work, kcryptd_crypt);
queue_work(cc->crypt_queue, &io->work);
@ -1708,7 +1707,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
struct dm_crypt_io *io;
struct crypt_config *cc;
struct crypt_config *cc = ti->private;
/*
* If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues.
@ -1716,14 +1715,13 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
* - for REQ_DISCARD caller must use flush if IO ordering matters
*/
if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
cc = ti->private;
bio->bi_bdev = cc->dev->bdev;
if (bio_sectors(bio))
bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector);
return DM_MAPIO_REMAPPED;
}
io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector));
io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_sector));
if (bio_data_dir(io->base_bio) == READ) {
if (kcryptd_io_read(io, GFP_NOWAIT))