From 7988613b0e5b2638caf6cd493cc78e9595eba19c Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Sat, 23 Nov 2013 17:19:00 -0800 Subject: block: Convert bio_for_each_segment() to bvec_iter More prep work for immutable biovecs - with immutable bvecs drivers won't be able to use the biovec directly, they'll need to use helpers that take into account bio->bi_iter.bi_bvec_done. This updates callers for the new usage without changing the implementation yet. Signed-off-by: Kent Overstreet Cc: Jens Axboe Cc: Geert Uytterhoeven Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "Ed L. Cashin" Cc: Nick Piggin Cc: Lars Ellenberg Cc: Jiri Kosina Cc: Paul Clements Cc: Jim Paris Cc: Geoff Levand Cc: Yehuda Sadeh Cc: Sage Weil Cc: Alex Elder Cc: ceph-devel@vger.kernel.org Cc: Joshua Morris Cc: Philip Kelleher Cc: Konrad Rzeszutek Wilk Cc: Jeremy Fitzhardinge Cc: Neil Brown Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux390@de.ibm.com Cc: Nagalakshmi Nandigama Cc: Sreekanth Reddy Cc: support@lsi.com Cc: "James E.J. Bottomley" Cc: Greg Kroah-Hartman Cc: Alexander Viro Cc: Steven Whitehouse Cc: Herton Ronaldo Krzesinski Cc: Tejun Heo Cc: Andrew Morton Cc: Guo Chao Cc: Asai Thambi S P Cc: Selvan Mani Cc: Sam Bradshaw Cc: Matthew Wilcox Cc: Keith Busch Cc: Stephen Hemminger Cc: Quoc-Son Anh Cc: Sebastian Ott Cc: Nitin Gupta Cc: Minchan Kim Cc: Jerome Marchand Cc: Seth Jennings Cc: "Martin K. Petersen" Cc: Mike Snitzer Cc: Vivek Goyal Cc: "Darrick J. Wong" Cc: Chris Metcalf Cc: Jan Kara Cc: linux-m68k@lists.linux-m68k.org Cc: linuxppc-dev@lists.ozlabs.org Cc: drbd-user@lists.linbit.com Cc: nbd-general@lists.sourceforge.net Cc: cbe-oss-dev@lists.ozlabs.org Cc: xen-devel@lists.xensource.com Cc: virtualization@lists.linux-foundation.org Cc: linux-raid@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: DL-MPTFusionLinux@lsi.com Cc: linux-scsi@vger.kernel.org Cc: devel@driverdev.osuosl.org Cc: linux-fsdevel@vger.kernel.org Cc: cluster-devel@redhat.com Cc: linux-mm@kvack.org Acked-by: Geoff Levand --- include/linux/bio.h | 28 ++++++++++++++-------------- include/linux/blkdev.h | 7 ++++--- 2 files changed, 18 insertions(+), 17 deletions(-) (limited to 'include/linux') diff --git a/include/linux/bio.h b/include/linux/bio.h index 9f182fcbe714..c16adb5f69f8 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -63,10 +63,13 @@ */ #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) #define __bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_iter.bi_idx) -#define bio_iovec(bio) (*__bio_iovec(bio)) + +#define bio_iter_iovec(bio, iter) ((bio)->bi_io_vec[(iter).bi_idx]) #define bio_page(bio) (bio_iovec((bio)).bv_page) #define bio_offset(bio) (bio_iovec((bio)).bv_offset) +#define bio_iovec(bio) (*__bio_iovec(bio)) + #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_iter.bi_idx) #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) @@ -133,15 +136,6 @@ static inline void *bio_data(struct bio *bio) #define bio_io_error(bio) bio_endio((bio), -EIO) -/* - * drivers should not use the __ version unless they _really_ know what - * they're doing - */ -#define __bio_for_each_segment(bvl, bio, i, start_idx) \ - for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ - i < (bio)->bi_vcnt; \ - bvl++, i++) - /* * drivers should _never_ use the all version - the bio may have been split * before it got to the driver and the driver won't own all of it @@ -151,10 +145,16 @@ static inline void *bio_data(struct bio *bio) bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \ i++) -#define bio_for_each_segment(bvl, bio, i) \ - for (i = (bio)->bi_iter.bi_idx; \ - bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \ - i++) +#define __bio_for_each_segment(bvl, bio, iter, start) \ + for (iter = (start); \ + bvl = bio_iter_iovec((bio), (iter)), \ + (iter).bi_idx < (bio)->bi_vcnt; \ + (iter).bi_idx++) + +#define bio_for_each_segment(bvl, bio, iter) \ + __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) + +#define bio_iter_last(bio, iter) ((iter).bi_idx == (bio)->bi_vcnt - 1) /* * get a reference to a bio, so it won't disappear. the intended use is diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1b135d49b279..337b92a54658 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -735,7 +735,7 @@ struct rq_map_data { }; struct req_iterator { - int i; + struct bvec_iter iter; struct bio *bio; }; @@ -748,10 +748,11 @@ struct req_iterator { #define rq_for_each_segment(bvl, _rq, _iter) \ __rq_for_each_bio(_iter.bio, _rq) \ - bio_for_each_segment(bvl, _iter.bio, _iter.i) + bio_for_each_segment(bvl, _iter.bio, _iter.iter) #define rq_iter_last(rq, _iter) \ - (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) + (_iter.bio->bi_next == NULL && \ + bio_iter_last(_iter.bio, _iter.iter)) #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" -- cgit v1.2.3-71-gd317