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Commit 7c20f116 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

bio-integrity: stop abusing bi_end_io 



And instead call directly into the integrity code from bio_end_io.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 63573e35

block/bio-integrity.c

+12 −27
Original line number Diff line number Diff line
@@ -102,7 +102,7 @@ EXPORT_SYMBOL(bio_integrity_alloc); 
 * Description: Used to free the integrity portion of a bio. Usually

 * called from bio_free().

 */

void bio_integrity_free(struct bio *bio)

static void bio_integrity_free(struct bio *bio)

{

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct bio_set *bs = bio->bi_pool;
@@ -120,8 +120,8 @@ void bio_integrity_free(struct bio *bio) 
	}



	bio->bi_integrity = NULL;

	bio->bi_opf &= ~REQ_INTEGRITY;

}

EXPORT_SYMBOL(bio_integrity_free);



/**

 * bio_integrity_add_page - Attach integrity metadata
@@ -326,12 +326,6 @@ bool bio_integrity_prep(struct bio *bio) 
		offset = 0;

	}



	/* Install custom I/O completion handler if read verify is enabled */

	if (bio_data_dir(bio) == READ) {

		bip->bip_end_io = bio->bi_end_io;

		bio->bi_end_io = bio_integrity_endio;

	}



	/* Auto-generate integrity metadata if this is a write */

	if (bio_data_dir(bio) == WRITE) {

		bio_integrity_process(bio, &bio->bi_iter,
@@ -375,13 +369,12 @@ static void bio_integrity_verify_fn(struct work_struct *work) 
		bio->bi_status = BLK_STS_IOERR;

	}



	/* Restore original bio completion handler */

	bio->bi_end_io = bip->bip_end_io;

	bio_integrity_free(bio);

	bio_endio(bio);

}



/**

 * bio_integrity_endio - Integrity I/O completion function

 * __bio_integrity_endio - Integrity I/O completion function

 * @bio:	Protected bio

 * @error:	Pointer to errno

 *
@@ -392,27 +385,19 @@ static void bio_integrity_verify_fn(struct work_struct *work) 
 * in process context.	This function postpones completion

 * accordingly.

 */

void bio_integrity_endio(struct bio *bio)

bool __bio_integrity_endio(struct bio *bio)

{

	if (bio_op(bio) == REQ_OP_READ && !bio->bi_status) {

		struct bio_integrity_payload *bip = bio_integrity(bio);



	BUG_ON(bip->bip_bio != bio);



	/* In case of an I/O error there is no point in verifying the

	 * integrity metadata.  Restore original bio end_io handler

	 * and run it.

	 */

	if (bio->bi_status) {

		bio->bi_end_io = bip->bip_end_io;

		bio_endio(bio);



		return;

	}



		INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);

		queue_work(kintegrityd_wq, &bip->bip_work);

		return false;

	}



	bio_integrity_free(bio);

	return true;

}

EXPORT_SYMBOL(bio_integrity_endio);



/**

 * bio_integrity_advance - Advance integrity vector

block/bio.c

+2 −3
Original line number Diff line number Diff line
@@ -243,9 +243,6 @@ struct bio_vec *bvec_alloc(gfp_t gfp_mask, int nr, unsigned long *idx, 
void bio_uninit(struct bio *bio)

{

	bio_disassociate_task(bio);



	if (bio_integrity(bio))

		bio_integrity_free(bio);

}

EXPORT_SYMBOL(bio_uninit);
@@ -1813,6 +1810,8 @@ void bio_endio(struct bio *bio) 
again:

	if (!bio_remaining_done(bio))

		return;

	if (!bio_integrity_endio(bio))

		return;



	/*

	 * Need to have a real endio function for chained bios, otherwise

block/blk.h

+11 −0
Original line number Diff line number Diff line
@@ -81,10 +81,21 @@ static inline void blk_queue_enter_live(struct request_queue *q) 


#ifdef CONFIG_BLK_DEV_INTEGRITY

void blk_flush_integrity(void);

bool __bio_integrity_endio(struct bio *);

static inline bool bio_integrity_endio(struct bio *bio)

{

	if (bio_integrity(bio))

		return __bio_integrity_endio(bio);

	return true;

}

#else

static inline void blk_flush_integrity(void)

{

}

static inline bool bio_integrity_endio(struct bio *bio)

{

	return true;

}

#endif



void blk_timeout_work(struct work_struct *work);

include/linux/bio.h

+0 −9
Original line number Diff line number Diff line
@@ -320,8 +320,6 @@ struct bio_integrity_payload { 


	struct bvec_iter	bip_iter;



	bio_end_io_t		*bip_end_io;	/* saved I/O completion fn */



	unsigned short		bip_slab;	/* slab the bip came from */

	unsigned short		bip_vcnt;	/* # of integrity bio_vecs */

	unsigned short		bip_max_vcnt;	/* integrity bio_vec slots */
@@ -739,10 +737,8 @@ struct biovec_slab { 
		bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)



extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);

extern void bio_integrity_free(struct bio *);

extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);

extern bool bio_integrity_prep(struct bio *);

extern void bio_integrity_endio(struct bio *);

extern void bio_integrity_advance(struct bio *, unsigned int);

extern void bio_integrity_trim(struct bio *);

extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
@@ -772,11 +768,6 @@ static inline bool bio_integrity_prep(struct bio *bio) 
	return true;

}



static inline void bio_integrity_free(struct bio *bio)

{

	return;

}



static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,

				      gfp_t gfp_mask)

{