[PATCH 06/22] block: Convert bio_iovec() to bvec_iter
From: Kent Overstreet <hidden>
Date: 2013-08-07 21:55:08
Also in:
dm-devel, linux-fsdevel, lkml
Subsystem:
ata over ethernet (aoe) driver, bcache (block layer cache), block layer, device-mapper (lvm), filesystems (vfs and infrastructure), scsi subsystem, the rest · Maintainers:
"Justin Sanders", Coly Li, Kent Overstreet, Jens Axboe, Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Alexander Viro, Christian Brauner, "James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
For immutable biovecs, we'll be introducing a new bio_iovec() that uses our new bvec iterator to construct a biovec, taking into account bvec_iter->bi_bvec_done - this patch updates existing users for the new usage. Some of the existing users really do need a pointer into the bvec array - those uses are all going to be removed, but we'll need the functionality from immutable to remove them - so for now rename the existing bio_iovec() -> __bio_iovec(), and it'll be removed in a couple patches. Signed-off-by: Kent Overstreet <redacted> Cc: Jens Axboe <axboe@kernel.dk> Cc: "Ed L. Cashin" <redacted> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Cc: "James E.J. Bottomley" <redacted> --- drivers/block/aoe/aoecmd.c | 2 +- drivers/md/bcache/io.c | 13 +++++++------ drivers/md/dm-verity.c | 2 +- drivers/scsi/sd.c | 2 +- fs/bio.c | 20 ++++++++++---------- include/linux/bio.h | 10 ++++++---- 6 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 3f1a192..9ec8c2d 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c@@ -939,7 +939,7 @@ bufinit(struct buf *buf, struct request *rq, struct bio *bio) buf->resid = bio->bi_iter.bi_size; buf->sector = bio->bi_iter.bi_sector; bio_pageinc(bio); - buf->bv = bio_iovec(bio); + buf->bv = __bio_iovec(bio); buf->bv_resid = buf->bv->bv_len; WARN_ON(buf->bv_resid == 0); }
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index cc4ba2d..dc44f06 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c@@ -22,11 +22,12 @@ static void bch_bi_idx_hack_endio(struct bio *bio, int error) static void bch_generic_make_request_hack(struct bio *bio) { if (bio->bi_iter.bi_idx) { + int i; + struct bio_vec *bv; struct bio *clone = bio_alloc(GFP_NOIO, bio_segments(bio)); - memcpy(clone->bi_io_vec, - bio_iovec(bio), - bio_segments(bio) * sizeof(struct bio_vec)); + bio_for_each_segment(bv, bio, i) + clone->bi_io_vec[clone->bi_vcnt++] = *bv; clone->bi_iter.bi_sector = bio->bi_iter.bi_sector; clone->bi_bdev = bio->bi_bdev;
@@ -97,7 +98,7 @@ struct bio *bch_bio_split(struct bio *bio, int sectors, if (!ret) return NULL; - memcpy(ret->bi_io_vec, bio_iovec(bio), + memcpy(ret->bi_io_vec, __bio_iovec(bio), sizeof(struct bio_vec) * vcnt); break;
@@ -106,7 +107,7 @@ struct bio *bch_bio_split(struct bio *bio, int sectors, if (!ret) return NULL; - memcpy(ret->bi_io_vec, bio_iovec(bio), + memcpy(ret->bi_io_vec, __bio_iovec(bio), sizeof(struct bio_vec) * vcnt); ret->bi_io_vec[vcnt - 1].bv_len = nbytes;
@@ -182,7 +183,7 @@ static unsigned bch_bio_max_sectors(struct bio *bio) ret = min(ret, queue_max_sectors(q)); WARN_ON(!ret); - ret = max_t(int, ret, bio_iovec(bio)->bv_len >> 9); + ret = max_t(int, ret, bio_iovec(bio).bv_len >> 9); return ret; }
diff --git a/drivers/md/dm-verity.c b/drivers/md/dm-verity.c
index bf84bb3..27f9705 100644
--- a/drivers/md/dm-verity.c
+++ b/drivers/md/dm-verity.c@@ -525,7 +525,7 @@ static int verity_map(struct dm_target *ti, struct bio *bio) io->io_vec = io->io_vec_inline; else io->io_vec = mempool_alloc(v->vec_mempool, GFP_NOIO); - memcpy(io->io_vec, bio_iovec(bio), + memcpy(io->io_vec, __bio_iovec(bio), io->io_vec_size * sizeof(struct bio_vec)); verity_submit_prefetch(v, io);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 86fcf2c..f7d8e3a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c@@ -799,7 +799,7 @@ static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq) if (sdkp->device->no_write_same) return BLKPREP_KILL; - BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size); + BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); sector >>= ilog2(sdp->sector_size) - 9; nr_sectors >>= ilog2(sdp->sector_size) - 9;
diff --git a/fs/bio.c b/fs/bio.c
index 0a86e2c..d10952c 100644
--- a/fs/bio.c
+++ b/fs/bio.c@@ -821,12 +821,12 @@ void bio_advance(struct bio *bio, unsigned bytes) break; } - if (bytes >= bio_iovec(bio)->bv_len) { - bytes -= bio_iovec(bio)->bv_len; + if (bytes >= bio_iovec(bio).bv_len) { + bytes -= bio_iovec(bio).bv_len; bio->bi_iter.bi_idx++; } else { - bio_iovec(bio)->bv_len -= bytes; - bio_iovec(bio)->bv_offset += bytes; + bio_iovec(bio).bv_len -= bytes; + bio_iovec(bio).bv_offset += bytes; bytes = 0; } }
@@ -879,8 +879,8 @@ void bio_copy_data(struct bio *dst, struct bio *src) unsigned src_offset, dst_offset, bytes; void *src_p, *dst_p; - src_bv = bio_iovec(src); - dst_bv = bio_iovec(dst); + src_bv = __bio_iovec(src); + dst_bv = __bio_iovec(dst); src_offset = src_bv->bv_offset; dst_offset = dst_bv->bv_offset;
@@ -893,7 +893,7 @@ void bio_copy_data(struct bio *dst, struct bio *src) if (!src) break; - src_bv = bio_iovec(src); + src_bv = __bio_iovec(src); } src_offset = src_bv->bv_offset;
@@ -906,7 +906,7 @@ void bio_copy_data(struct bio *dst, struct bio *src) if (!dst) break; - dst_bv = bio_iovec(dst); + dst_bv = __bio_iovec(dst); } dst_offset = dst_bv->bv_offset;
@@ -1766,8 +1766,8 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors) bp->bio1.bi_iter.bi_size = first_sectors << 9; if (bi->bi_vcnt != 0) { - bp->bv1 = *bio_iovec(bi); - bp->bv2 = *bio_iovec(bi); + bp->bv1 = bio_iovec(bi); + bp->bv2 = bio_iovec(bi); if (bio_is_rw(bi)) { bp->bv2.bv_offset += first_sectors << 9;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 5f440f0..58d5647 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h@@ -62,9 +62,11 @@ * on highmem page vectors */ #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_page(bio) bio_iovec((bio))->bv_page -#define bio_offset(bio) bio_iovec((bio))->bv_offset +#define __bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_iter.bi_idx) +#define bio_iovec(bio) (*__bio_iovec(bio)) + +#define bio_page(bio) (bio_iovec((bio)).bv_page) +#define bio_offset(bio) (bio_iovec((bio)).bv_offset) #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)))
@@ -72,7 +74,7 @@ static inline unsigned int bio_cur_bytes(struct bio *bio) { if (bio->bi_vcnt) - return bio_iovec(bio)->bv_len; + return bio_iovec(bio).bv_len; else /* dataless requests such as discard */ return bio->bi_iter.bi_size; }
--
1.8.4.rc1