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Commit 43d69034 authored by Milan Broz's avatar Milan Broz Committed by Alasdair G Kergon
Browse files

dm crypt: add completion for async 



dm-crypt: Use crypto ablkcipher interface
Prepare completion for async crypto request.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent ddd42edf

drivers/md/dm-crypt.c

+21 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * This file is released under the GPL.

 */



#include <linux/completion.h>

#include <linux/err.h>

#include <linux/module.h>

#include <linux/init.h>
@@ -31,6 +32,7 @@ 
 * context holding the current state of a multi-part conversion

 */

struct convert_context {

	struct completion restart;

	struct bio *bio_in;

	struct bio *bio_out;

	unsigned int offset_in;
@@ -38,6 +40,7 @@ struct convert_context { 
	unsigned int idx_in;

	unsigned int idx_out;

	sector_t sector;

	atomic_t pending;

};



/*
@@ -359,6 +362,15 @@ static void crypt_convert_init(struct crypt_config *cc, 
	ctx->idx_in = bio_in ? bio_in->bi_idx : 0;

	ctx->idx_out = bio_out ? bio_out->bi_idx : 0;

	ctx->sector = sector + cc->iv_offset;

	init_completion(&ctx->restart);

	/*

	 * Crypto operation can be asynchronous,

	 * ctx->pending is increased after request submission.

	 * We need to ensure that we don't call the crypt finish

	 * operation before pending got incremented

	 * (dependent on crypt submission return code).

	 */

	atomic_set(&ctx->pending, 2);

}



static int crypt_convert_block(struct crypt_config *cc,
@@ -418,6 +430,15 @@ static int crypt_convert(struct crypt_config *cc, 
		ctx->sector++;

	}



	/*

	 * If there are pending crypto operation run async

	 * code. Otherwise process return code synchronously.

	 * The step of 2 ensures that async finish doesn't

	 * call crypto finish too early.

	 */

	if (atomic_sub_return(2, &ctx->pending))

		return -EINPROGRESS;



	return r;

}