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authorMartin K. Petersen <martin.petersen@oracle.com>2010-09-10 22:50:10 +0400
committerJens Axboe <axboe@carl.home.kernel.dk>2010-09-10 22:50:10 +0400
commit13f05c8d8e98bbdce89158bfdb2e380940695a88 (patch)
tree055215e7e2b1bdc684ead64daa61b30b35eaa3c5 /include/linux/bio.h
parentc8bf1336824ebd698d37b71763e1c43190f2229a (diff)
downloadlinux-13f05c8d8e98bbdce89158bfdb2e380940695a88.tar.xz
block/scsi: Provide a limit on the number of integrity segments
Some controllers have a hardware limit on the number of protection information scatter-gather list segments they can handle. Introduce a max_integrity_segments limit in the block layer and provide a new scsi_host_template setting that allows HBA drivers to provide a value suitable for the hardware. Add support for honoring the integrity segment limit when merging both bios and requests. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>
Diffstat (limited to 'include/linux/bio.h')
-rw-r--r--include/linux/bio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 5274103434ad..2c3fd7421607 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -496,6 +496,10 @@ static inline struct bio *bio_list_get(struct bio_list *bl)
#define bip_for_each_vec(bvl, bip, i) \
__bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
+#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
+ for_each_bio(_bio) \
+ bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
+
#define bio_integrity(bio) (bio->bi_integrity != NULL)
extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);