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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 19:19:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 19:19:15 -0700
commit7a48837732f87a574ee3e1855927dc250117f565 (patch)
treef2e975a347d6d489e9f1932f9864fc978910def0 /fs/bio-integrity.c
parent1a0b6abaea78f73d9bc0a2f6df2d9e4c917cade1 (diff)
parent27fbf4e87c16bb3e40730890169a643a494b7c64 (diff)
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Merge branch 'for-3.15/core' of git://git.kernel.dk/linux-block
Pull core block layer updates from Jens Axboe: "This is the pull request for the core block IO bits for the 3.15 kernel. It's a smaller round this time, it contains: - Various little blk-mq fixes and additions from Christoph and myself. - Cleanup of the IPI usage from the block layer, and associated helper code. From Frederic Weisbecker and Jan Kara. - Duplicate code cleanup in bio-integrity from Gu Zheng. This will give you a merge conflict, but that should be easy to resolve. - blk-mq notify spinlock fix for RT from Mike Galbraith. - A blktrace partial accounting bug fix from Roman Pen. - Missing REQ_SYNC detection fix for blk-mq from Shaohua Li" * 'for-3.15/core' of git://git.kernel.dk/linux-block: (25 commits) blk-mq: add REQ_SYNC early rt,blk,mq: Make blk_mq_cpu_notify_lock a raw spinlock blk-mq: support partial I/O completions blk-mq: merge blk_mq_insert_request and blk_mq_run_request blk-mq: remove blk_mq_alloc_rq blk-mq: don't dump CPU -> hw queue map on driver load blk-mq: fix wrong usage of hctx->state vs hctx->flags blk-mq: allow blk_mq_init_commands() to return failure block: remove old blk_iopoll_enabled variable blktrace: fix accounting of partially completed requests smp: Rename __smp_call_function_single() to smp_call_function_single_async() smp: Remove wait argument from __smp_call_function_single() watchdog: Simplify a little the IPI call smp: Move __smp_call_function_single() below its safe version smp: Consolidate the various smp_call_function_single() declensions smp: Teach __smp_call_function_single() to check for offline cpus smp: Remove unused list_head from csd smp: Iterate functions through llist_for_each_entry_safe() block: Stop abusing rq->csd.list in blk-softirq block: Remove useless IPI struct initialization ...
Diffstat (limited to 'fs/bio-integrity.c')
-rw-r--r--fs/bio-integrity.c84
1 files changed, 36 insertions, 48 deletions
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 4f70f383132c..29696b78d1f4 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -301,25 +301,25 @@ 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, ret = 0;
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;
+
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
bix.sector_size = bi->sector_size;
@@ -330,16 +330,37 @@ 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;
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;
+}
+
+/**
+ * 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)
@@ -454,40 +475,7 @@ 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, ret = 0;
- void *prot_buf = bio->bi_integrity->bip_buf;
- int i;
-
- 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;
-
- kunmap_atomic(kaddr);
- }
-
- return ret;
+ return bio_integrity_generate_verify(bio, 0);
}
/**