2014-02-21 10:19:31

by Gu Zheng

Subject: [PATCH] fs/bio-integrity: remove duplicate code

Most code of function bio_integrity_verify and bio_integrity_generate
is the same, so introduce a help function bio_integrity_generate_verify()
to remove the duplicate code.

Signed-off-by: Gu Zheng <[email protected]>
---
fs/bio-integrity.c | 86 ++++++++++++++++++++++-----------------------------
1 files changed, 37 insertions(+), 49 deletions(-)

diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 0129b78..413312f 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -301,25 +301,26 @@ int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len)
EXPORT_SYMBOL(bio_integrity_get_tag);

/**
- * bio_integrity_generate - Generate integrity metadata for a bio
- * @bio: bio to generate integrity metadata for
- *
- * Description: Generates integrity metadata for a bio by calling the
- * block device's generation callback function. The bio must have a
- * bip attached with enough room to accommodate the generated
- * integrity metadata.
+ * bio_integrity_generate_verify - Generate/verify integrity metadata for a bio
+ * @bio: bio to generate/verify integrity metadata for
+ * @operate: operate number, 1 for generate, 0 for verify
*/
-static void bio_integrity_generate(struct bio *bio)
+static int bio_integrity_generate_verify(struct bio *bio, int operate)
{
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
struct blk_integrity_exchg bix;
struct bio_vec bv;
struct bvec_iter iter;
- sector_t sector = bio->bi_iter.bi_sector;
- unsigned int sectors, total;
+ sector_t sector;
+ unsigned int sectors, total, ret;
void *prot_buf = bio->bi_integrity->bip_buf;

- total = 0;
+ if (operate)
+ sector = bio->bi_iter.bi_sector;
+ else
+ sector = bio->bi_integrity->bip_iter.bi_sector;
+
+ total = ret = 0;
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
bix.sector_size = bi->sector_size;

@@ -330,7 +331,15 @@ static void bio_integrity_generate(struct bio *bio)
bix.prot_buf = prot_buf;
bix.sector = sector;

- bi->generate_fn(&bix);
+ if (operate) {
+ bi->generate_fn(&bix);
+ } else {
+ ret = bi->verify_fn(&bix);
+ if (ret) {
+ kunmap_atomic(kaddr);
+ return ret;
+ }
+ }

sectors = bv.bv_len / bi->sector_size;
sector += sectors;
@@ -340,6 +349,21 @@ static void bio_integrity_generate(struct bio *bio)

kunmap_atomic(kaddr);
}
+ return ret;
+}
+
+/**
+ * bio_integrity_generate - Generate integrity metadata for a bio
+ * @bio: bio to generate integrity metadata for
+ *
+ * Description: Generates integrity metadata for a bio by calling the
+ * block device's generation callback function. The bio must have a
+ * bip attached with enough room to accommodate the generated
+ * integrity metadata.
+ */
+static void bio_integrity_generate(struct bio *bio)
+{
+ bio_integrity_generate_verify(bio, 1);
}

static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
@@ -454,43 +478,7 @@ EXPORT_SYMBOL(bio_integrity_prep);
*/
static int bio_integrity_verify(struct bio *bio)
{
- struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
- struct blk_integrity_exchg bix;
- struct bio_vec *bv;
- sector_t sector = bio->bi_integrity->bip_iter.bi_sector;
- unsigned int sectors, total, ret;
- void *prot_buf = bio->bi_integrity->bip_buf;
- int i;
-
- ret = total = 0;
- bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
- bix.sector_size = bi->sector_size;
-
- bio_for_each_segment_all(bv, bio, i) {
- void *kaddr = kmap_atomic(bv->bv_page);
-
- bix.data_buf = kaddr + bv->bv_offset;
- bix.data_size = bv->bv_len;
- bix.prot_buf = prot_buf;
- bix.sector = sector;
-
- ret = bi->verify_fn(&bix);
-
- if (ret) {
- kunmap_atomic(kaddr);
- return ret;
- }
-
- sectors = bv->bv_len / bi->sector_size;
- sector += sectors;
- prot_buf += sectors * bi->tuple_size;
- total += sectors * bi->tuple_size;
- BUG_ON(total > bio->bi_integrity->bip_iter.bi_size);
-
- kunmap_atomic(kaddr);
- }
-
- return ret;
+ return bio_integrity_generate_verify(bio, 0);
}

/**
--
1.7.7

2014-02-21 23:28:07

by Jens Axboe

Subject: Re: [PATCH] fs/bio-integrity: remove duplicate code

On Fri, Feb 21 2014, Gu Zheng wrote:
> Most code of function bio_integrity_verify and bio_integrity_generate
> is the same, so introduce a help function bio_integrity_generate_verify()
> to remove the duplicate code.

Thanks, queued up for the next release.

--
Jens Axboe