[PATCH 10/22] bio-integrity: Convert to bvec_iter

Kent Overstreet
2013-08-07T22:00:28Z

The bio integrity is also stored in a bvec array, so if we use the bvec
iter code we just added, the integrity code won't need to implement its
own iteration stuff (bio_integrity_mark_head(), bio_integrity_mark_tail())

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
---
block/blk-integrity.c | 40 ++++++++++---------
drivers/scsi/sd_dif.c | 30 +++++++-------
fs/bio-integrity.c | 108 ++++++++++++--------------------------------------
include/linux/bio.h | 19 ++++-----
4 files changed, 71 insertions(+), 126 deletions(-)

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 03cf717..861fcae 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -43,30 +43,32 @@ static const char *bi_unsupported_name = "unsupported";
*/
int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
{
- struct bio_vec *iv, *ivprv = NULL;
+ struct bio_vec iv, ivprv;
unsigned int segments = 0;
unsigned int seg_size = 0;
- unsigned int i = 0;
+ struct bvec_iter iter;
+ int prev = 0;

- bio_for_each_integrity_vec(iv, bio, i) {
+ bio_for_each_integrity_vec(iv, bio, iter) {

- if (ivprv) {
- if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+ if (prev) {
+ if (!BIOVEC_PHYS_MERGEABLE(&ivprv, &iv))
goto new_segment;

- if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
+ if (!BIOVEC_SEG_BOUNDARY(q, &ivprv, &iv))
goto new_segment;

- if (seg_size + iv->bv_len > queue_max_segment_size(q))
+ if (seg_size + iv.bv_len > queue_max_segment_size(q))
goto new_segment;

- seg_size += iv->bv_len;
+ seg_size += iv.bv_len;
} else {
new_segment:
segments++;
- seg_size = iv->bv_len;
+ seg_size = iv.bv_len;
}

+ prev = 1;
ivprv = iv;
}

@@ -87,24 +89,25 @@ EXPORT_SYMBOL(blk_rq_count_integrity_sg);
int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio,
struct scatterlist *sglist)
{
- struct bio_vec *iv, *ivprv = NULL;
+ struct bio_vec iv, ivprv;
struct scatterlist *sg = NULL;
unsigned int segments = 0;
- unsigned int i = 0;
+ struct bvec_iter iter;
+ int prev = 0;

- bio_for_each_integrity_vec(iv, bio, i) {
+ bio_for_each_integrity_vec(iv, bio, iter) {

- if (ivprv) {
- if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+ if (prev) {
+ if (!BIOVEC_PHYS_MERGEABLE(&ivprv, &iv))
goto new_segment;

- if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
+ if (!BIOVEC_SEG_BOUNDARY(q, &ivprv, &iv))
goto new_segment;

- if (sg->length + iv->bv_len > queue_max_segment_size(q))
+ if (sg->length + iv.bv_len > queue_max_segment_size(q))
goto new_segment;

- sg->length += iv->bv_len;
+ sg->length += iv.bv_len;
} else {
new_segment:
if (!sg)
@@ -114,10 +117,11 @@ new_segment:
sg = sg_next(sg);
}

- sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset);
+ sg_set_page(sg, iv.bv_page, iv.bv_len, iv.bv_offset);
segments++;
}

+ prev = 1;
ivprv = iv;
}

diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 6174ca4..a7a691d 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -365,7 +365,6 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector,
struct bio *bio;
struct scsi_disk *sdkp;
struct sd_dif_tuple *sdt;
- unsigned int i, j;
u32 phys, virt;

sdkp = rq->bio->bi_bdev->bd_disk->private_data;
@@ -376,19 +375,21 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector,
phys = hw_sector & 0xffffffff;

__rq_for_each_bio(bio, rq) {
- struct bio_vec *iv;
+ struct bio_vec iv;
+ struct bvec_iter iter;
+ unsigned int j;

/* Already remapped? */
if (bio_flagged(bio, BIO_MAPPED_INTEGRITY))
break;

- virt = bio->bi_integrity->bip_sector & 0xffffffff;
+ virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;

- bip_for_each_vec(iv, bio->bi_integrity, i) {
- sdt = kmap_atomic(iv->bv_page)
- + iv->bv_offset;
+ bip_for_each_vec(iv, bio->bi_integrity, iter) {
+ sdt = kmap_atomic(iv.bv_page)
+ + iv.bv_offset;

- for (j = 0 ; j < iv->bv_len ; j += tuple_sz, sdt++) {
+ for (j = 0; j < iv.bv_len; j += tuple_sz, sdt++) {

if (be32_to_cpu(sdt->ref_tag) == virt)
sdt->ref_tag = cpu_to_be32(phys);
@@ -414,7 +415,7 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
struct scsi_disk *sdkp;
struct bio *bio;
struct sd_dif_tuple *sdt;
- unsigned int i, j, sectors, sector_sz;
+ unsigned int j, sectors, sector_sz;
u32 phys, virt;

sdkp = scsi_disk(scmd->request->rq_disk);
@@ -430,15 +431,16 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
phys >>= 3;

__rq_for_each_bio(bio, scmd->request) {
- struct bio_vec *iv;
+ struct bio_vec iv;
+ struct bvec_iter iter;

- virt = bio->bi_integrity->bip_sector & 0xffffffff;
+ virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;

- bip_for_each_vec(iv, bio->bi_integrity, i) {
- sdt = kmap_atomic(iv->bv_page)
- + iv->bv_offset;
+ bip_for_each_vec(iv, bio->bi_integrity, iter) {
+ sdt = kmap_atomic(iv.bv_page)
+ + iv.bv_offset;

- for (j = 0 ; j < iv->bv_len ; j += tuple_sz, sdt++) {
+ for (j = 0; j < iv.bv_len; j += tuple_sz, sdt++) {

if (sectors == 0) {
kunmap_atomic(sdt);
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 4220b96..61f41ff 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -134,8 +134,7 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
return 0;
}

- iv = bip_vec_idx(bip, bip->bip_vcnt);
- BUG_ON(iv == NULL);
+ iv = bip->bip_vec + bip->bip_vcnt;

iv->bv_page = page;
iv->bv_len = len;
@@ -203,6 +202,12 @@ static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi,
return sectors;
}

+static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
+ unsigned int sectors)
+{
+ return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size;
+}
+
/**
* bio_integrity_tag_size - Retrieve integrity tag space
* @bio: bio to inspect
@@ -235,9 +240,9 @@ int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set)
nr_sectors = bio_integrity_hw_sectors(bi,
DIV_ROUND_UP(len, bi->tag_size));

- if (nr_sectors * bi->tuple_size > bip->bip_size) {
- printk(KERN_ERR "%s: tag too big for bio: %u > %u\n",
- __func__, nr_sectors * bi->tuple_size, bip->bip_size);
+ if (nr_sectors * bi->tuple_size > bip->bip_iter.bi_size) {
+ printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", __func__,
+ nr_sectors * bi->tuple_size, bip->bip_iter.bi_size);
return -1;
}

@@ -322,7 +327,7 @@ static void bio_integrity_generate(struct bio *bio)
sector += sectors;
prot_buf += sectors * bi->tuple_size;
total += sectors * bi->tuple_size;
- BUG_ON(total > bio->bi_integrity->bip_size);
+ BUG_ON(total > bio->bi_integrity->bip_iter.bi_size);

kunmap_atomic(kaddr);
}
@@ -387,8 +392,8 @@ int bio_integrity_prep(struct bio *bio)

bip->bip_owns_buf = 1;
bip->bip_buf = buf;
- bip->bip_size = len;
- bip->bip_sector = bio->bi_iter.bi_sector;
+ bip->bip_iter.bi_size = len;
+ bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;

/* Map it */
offset = offset_in_page(buf);
@@ -444,7 +449,7 @@ static int bio_integrity_verify(struct bio *bio)
struct blk_integrity_exchg bix;
struct bio_vec bv;
struct bvec_iter iter;
- sector_t sector = bio->bi_integrity->bip_sector;
+ sector_t sector = bio->bi_integrity->bip_iter.bi_sector;
unsigned int sectors, total, ret;
void *prot_buf = bio->bi_integrity->bip_buf;

@@ -470,7 +475,7 @@ static int bio_integrity_verify(struct bio *bio)
sector += sectors;
prot_buf += sectors * bi->tuple_size;
total += sectors * bi->tuple_size;
- BUG_ON(total > bio->bi_integrity->bip_size);
+ BUG_ON(total > bio->bi_integrity->bip_iter.bi_size);

kunmap_atomic(kaddr);
}
@@ -535,56 +540,6 @@ void bio_integrity_endio(struct bio *bio, int error)
EXPORT_SYMBOL(bio_integrity_endio);

/**
- * bio_integrity_mark_head - Advance bip_vec skip bytes
- * @bip: Integrity vector to advance
- * @skip: Number of bytes to advance it
- */
-void bio_integrity_mark_head(struct bio_integrity_payload *bip,
- unsigned int skip)
-{
- struct bio_vec *iv;
- unsigned int i;
-
- bip_for_each_vec(iv, bip, i) {
- if (skip == 0) {
- bip->bip_idx = i;
- return;
- } else if (skip >= iv->bv_len) {
- skip -= iv->bv_len;
- } else { /* skip < iv->bv_len) */
- iv->bv_offset += skip;
- iv->bv_len -= skip;
- bip->bip_idx = i;
- return;
- }
- }
-}
-
-/**
- * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long
- * @bip: Integrity vector to truncate
- * @len: New length of integrity vector
- */
-void bio_integrity_mark_tail(struct bio_integrity_payload *bip,
- unsigned int len)
-{
- struct bio_vec *iv;
- unsigned int i;
-
- bip_for_each_vec(iv, bip, i) {
- if (len == 0) {
- bip->bip_vcnt = i;
- return;
- } else if (len >= iv->bv_len) {
- len -= iv->bv_len;
- } else { /* len < iv->bv_len) */
- iv->bv_len = len;
- len = 0;
- }
- }
-}
-
-/**
* bio_integrity_advance - Advance integrity vector
* @bio: bio whose integrity vector to update
* @bytes_done: number of data bytes that have been completed
@@ -597,13 +552,9 @@ void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
{
struct bio_integrity_payload *bip = bio->bi_integrity;
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
- unsigned int nr_sectors;
+ unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);

- BUG_ON(bip == NULL);
- BUG_ON(bi == NULL);
-
- nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9);
- bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size);
+ bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
}
EXPORT_SYMBOL(bio_integrity_advance);

@@ -623,16 +574,9 @@ void bio_integrity_trim(struct bio *bio, unsigned int offset,
{
struct bio_integrity_payload *bip = bio->bi_integrity;
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
- unsigned int nr_sectors;

- BUG_ON(bip == NULL);
- BUG_ON(bi == NULL);
- BUG_ON(!bio_flagged(bio, BIO_CLONED));
-
- nr_sectors = bio_integrity_hw_sectors(bi, sectors);
- bip->bip_sector = bip->bip_sector + offset;
- bio_integrity_mark_head(bip, offset * bi->tuple_size);
- bio_integrity_mark_tail(bip, sectors * bi->tuple_size);
+ bio_integrity_advance(bio, offset << 9);
+ bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors);
}
EXPORT_SYMBOL(bio_integrity_trim);

@@ -662,8 +606,8 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
bp->bio1.bi_integrity = &bp->bip1;
bp->bio2.bi_integrity = &bp->bip2;

- bp->iv1 = bip->bip_vec[bip->bip_idx];
- bp->iv2 = bip->bip_vec[bip->bip_idx];
+ bp->iv1 = bip->bip_vec[bip->bip_iter.bi_idx];
+ bp->iv2 = bip->bip_vec[bip->bip_iter.bi_idx];

bp->bip1.bip_vec = &bp->iv1;
bp->bip2.bip_vec = &bp->iv2;
@@ -672,11 +616,12 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
bp->iv2.bv_offset += sectors * bi->tuple_size;
bp->iv2.bv_len -= sectors * bi->tuple_size;

- bp->bip1.bip_sector = bio->bi_integrity->bip_sector;
- bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors;
+ bp->bip1.bip_iter.bi_sector = bio->bi_integrity->bip_iter.bi_sector;
+ bp->bip2.bip_iter.bi_sector =
+ bio->bi_integrity->bip_iter.bi_sector + nr_sectors;

bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1;
- bp->bip1.bip_idx = bp->bip2.bip_idx = 0;
+ bp->bip1.bip_iter.bi_idx = bp->bip2.bip_iter.bi_idx = 0;
}
EXPORT_SYMBOL(bio_integrity_split);

@@ -704,9 +649,8 @@ int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
memcpy(bip->bip_vec, bip_src->bip_vec,
bip_src->bip_vcnt * sizeof(struct bio_vec));

- bip->bip_sector = bip_src->bip_sector;
bip->bip_vcnt = bip_src->bip_vcnt;
- bip->bip_idx = bip_src->bip_idx;
+ bip->bip_iter = bip_src->bip_iter;

return 0;
}
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 151868e..57a6f40 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -244,16 +244,15 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
struct bio_integrity_payload {
struct bio *bip_bio; /* parent bio */

- sector_t bip_sector; /* virtual start sector */
+ struct bvec_iter bip_iter;

+ /* kill - should just use bip_vec */
void *bip_buf; /* generated integrity data */
- bio_end_io_t *bip_end_io; /* saved I/O completion fn */

- unsigned int bip_size;
+ 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_idx; /* current bip_vec index */
unsigned bip_owns_buf:1; /* should free bip_buf */

struct work_struct bip_work; /* I/O completion */
@@ -624,16 +623,12 @@ struct biovec_slab {

#if defined(CONFIG_BLK_DEV_INTEGRITY)

-#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
-#define bip_vec(bip) bip_vec_idx(bip, 0)

-#define __bip_for_each_vec(bvl, bip, i, start_idx) \
- for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
- i < (bip)->bip_vcnt; \
- bvl++, i++)

-#define bip_for_each_vec(bvl, bip, i) \
- __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
+#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
+
+#define bip_for_each_vec(bvl, bip, iter) \
+ for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)

#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
for_each_bio(_bio) \
--
1.8.4.rc1