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dm crypt: abstract crypt_write_done 

Process write request in separate function and queue
final bio through io workqueue.

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 02:10:57 +00:00 committed by Alasdair G Kergon
parent 0c395b0f8d
commit dec1cedf9d
1 changed files with 26 additions and 17 deletions
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43
drivers/md/dm-crypt.c
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@ -577,18 +577,34 @@ static void kcryptd_queue_io(struct dm_crypt_io *io)
static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error)
{
struct bio *clone = io->ctx.bio_out;
struct crypt_config *cc = io->target->private;
if (unlikely(error < 0)) {
crypt_free_buffer_pages(cc, clone);
bio_put(clone);
io->error = -EIO;
crypt_dec_pending(io);
return;
}
/* crypt_convert should have filled the clone bio */
BUG_ON(io->ctx.idx_out < clone->bi_vcnt);
clone->bi_sector = cc->start + io->sector;
io->sector += bio_sectors(clone);
}
static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
struct bio *base_bio = io->base_bio;
struct bio *clone;
unsigned remaining = base_bio->bi_size;
unsigned remaining = io->base_bio->bi_size;
int r;
atomic_inc(&io->pending);
crypt_convert_init(cc, &io->ctx, NULL, base_bio, io->sector);
crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, io->sector);
/*
* The allocated buffers can be smaller than the whole bio,
@ -605,20 +621,13 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
io->ctx.bio_out = clone;
io->ctx.idx_out = 0;
if (unlikely(crypt_convert(cc, &io->ctx) < 0)) {
crypt_free_buffer_pages(cc, clone);
bio_put(clone);
io->error = -EIO;
crypt_dec_pending(io);
return;
}
/* crypt_convert should have filled the clone bio */
BUG_ON(io->ctx.idx_out < clone->bi_vcnt);
clone->bi_sector = cc->start + io->sector;
remaining -= clone->bi_size;
io->sector += bio_sectors(clone);
r = crypt_convert(cc, &io->ctx);
kcryptd_crypt_write_io_submit(io, r);
if (unlikely(r < 0))
return;
/* Grab another reference to the io struct
* before we kick off the request */
@ -631,7 +640,7 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
* may be gone already. */
/* out of memory -> run queues */
if (remaining)
if (unlikely(remaining))
congestion_wait(WRITE, HZ/100);
}
}