From nobody Sat Feb 7 12:17:19 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B9D4C77B7C for ; Tue, 9 May 2023 16:58:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235112AbjEIQ6t (ORCPT ); Tue, 9 May 2023 12:58:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41498 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234778AbjEIQ6E (ORCPT ); Tue, 9 May 2023 12:58:04 -0400 Received: from out-53.mta1.migadu.com (out-53.mta1.migadu.com [IPv6:2001:41d0:203:375::35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BC0B55BE for ; Tue, 9 May 2023 09:57:23 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1683651442; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3/SbIkq+ijMraXia7ugf48JR6cDMRV7zGK3kOFrLB4E=; b=vJPR0Qn3EC9bMAfq8VR6BdvcjQnruU4RBysk7bOJcEdPkHQQ93fxnhJ9ZWKcph9l3lY0I1 R5bXPGNCfAYY1ib2v6vX6JIE1rrAXAYEkkDYMnjj+M+FTt2MRnobhRwrHV9rcczDkI+sJV 2FXqWBiIrAt76SsKf+Gfu/OkIDLL8gk= From: Kent Overstreet To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-bcachefs@vger.kernel.org Cc: Kent Overstreet , Jens Axboe , linux-block@vger.kernel.org, Ming Lei , Phillip Lougher Subject: [PATCH 12/32] block: Rework bio_for_each_segment_all() Date: Tue, 9 May 2023 12:56:37 -0400 Message-Id: <20230509165657.1735798-13-kent.overstreet@linux.dev> In-Reply-To: <20230509165657.1735798-1-kent.overstreet@linux.dev> References: <20230509165657.1735798-1-kent.overstreet@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This patch reworks bio_for_each_segment_all() to be more inline with how the other bio iterators work: - bio_iter_all_peek() now returns a synthesized bio_vec; we don't stash one in the iterator and pass a pointer to it - bad. This way makes it clearer what's a constructed value vs. a reference to something pre-existing, and it also will help with cleaning up and consolidating code with bio_for_each_folio_all(). - We now provide bio_for_each_segment_all_continue(), for squashfs: this makes their code clearer. Signed-off-by: Kent Overstreet Cc: Jens Axboe Cc: linux-block@vger.kernel.org Cc: Ming Lei Cc: Phillip Lougher --- block/bio.c | 38 ++++++++++++------------ block/blk-map.c | 38 ++++++++++++------------ block/bounce.c | 12 ++++---- drivers/md/bcache/btree.c | 8 ++--- drivers/md/dm-crypt.c | 10 +++---- drivers/md/raid1.c | 4 +-- fs/btrfs/disk-io.c | 4 +-- fs/btrfs/extent_io.c | 50 +++++++++++++++---------------- fs/btrfs/raid56.c | 14 ++++----- fs/erofs/zdata.c | 4 +-- fs/ext4/page-io.c | 8 ++--- fs/ext4/readpage.c | 4 +-- fs/f2fs/data.c | 20 ++++++------- fs/gfs2/lops.c | 10 +++---- fs/gfs2/meta_io.c | 8 ++--- fs/mpage.c | 4 +-- fs/squashfs/block.c | 48 +++++++++++++++++------------- fs/squashfs/lz4_wrapper.c | 17 ++++++----- fs/squashfs/lzo_wrapper.c | 17 ++++++----- fs/squashfs/xz_wrapper.c | 19 ++++++------ fs/squashfs/zlib_wrapper.c | 18 ++++++----- fs/squashfs/zstd_wrapper.c | 19 ++++++------ include/linux/bio.h | 34 ++++++++++++++++----- include/linux/bvec.h | 61 ++++++++++++++++++++++---------------- 24 files changed, 256 insertions(+), 213 deletions(-) diff --git a/block/bio.c b/block/bio.c index 70b5c987bc..f2845d4e47 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1163,13 +1163,13 @@ EXPORT_SYMBOL(bio_add_folio); =20 void __bio_release_pages(struct bio *bio, bool mark_dirty) { - struct bvec_iter_all iter_all; - struct bio_vec *bvec; + struct bvec_iter_all iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { - if (mark_dirty && !PageCompound(bvec->bv_page)) - set_page_dirty_lock(bvec->bv_page); - put_page(bvec->bv_page); + bio_for_each_segment_all(bvec, bio, iter) { + if (mark_dirty && !PageCompound(bvec.bv_page)) + set_page_dirty_lock(bvec.bv_page); + put_page(bvec.bv_page); } } EXPORT_SYMBOL_GPL(__bio_release_pages); @@ -1436,11 +1436,11 @@ EXPORT_SYMBOL(bio_copy_data); =20 void bio_free_pages(struct bio *bio) { - struct bio_vec *bvec; - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) - __free_page(bvec->bv_page); + bio_for_each_segment_all(bvec, bio, iter) + __free_page(bvec.bv_page); } EXPORT_SYMBOL(bio_free_pages); =20 @@ -1475,12 +1475,12 @@ EXPORT_SYMBOL(bio_free_pages); */ void bio_set_pages_dirty(struct bio *bio) { - struct bio_vec *bvec; - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { - if (!PageCompound(bvec->bv_page)) - set_page_dirty_lock(bvec->bv_page); + bio_for_each_segment_all(bvec, bio, iter) { + if (!PageCompound(bvec.bv_page)) + set_page_dirty_lock(bvec.bv_page); } } EXPORT_SYMBOL_GPL(bio_set_pages_dirty); @@ -1524,12 +1524,12 @@ static void bio_dirty_fn(struct work_struct *work) =20 void bio_check_pages_dirty(struct bio *bio) { - struct bio_vec *bvec; + struct bvec_iter_all iter; + struct bio_vec bvec; unsigned long flags; - struct bvec_iter_all iter_all; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { - if (!PageDirty(bvec->bv_page) && !PageCompound(bvec->bv_page)) + bio_for_each_segment_all(bvec, bio, iter) { + if (!PageDirty(bvec.bv_page) && !PageCompound(bvec.bv_page)) goto defer; } =20 diff --git a/block/blk-map.c b/block/blk-map.c index 9137d16cec..5774a9e467 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -46,21 +46,21 @@ static struct bio_map_data *bio_alloc_map_data(struct i= ov_iter *data, */ static int bio_copy_from_iter(struct bio *bio, struct iov_iter *iter) { - struct bio_vec *bvec; - struct bvec_iter_all iter_all; + struct bvec_iter_all bv_iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { + bio_for_each_segment_all(bvec, bio, bv_iter) { ssize_t ret; =20 - ret =3D copy_page_from_iter(bvec->bv_page, - bvec->bv_offset, - bvec->bv_len, + ret =3D copy_page_from_iter(bvec.bv_page, + bvec.bv_offset, + bvec.bv_len, iter); =20 if (!iov_iter_count(iter)) break; =20 - if (ret < bvec->bv_len) + if (ret < bvec.bv_len) return -EFAULT; } =20 @@ -77,21 +77,21 @@ static int bio_copy_from_iter(struct bio *bio, struct i= ov_iter *iter) */ static int bio_copy_to_iter(struct bio *bio, struct iov_iter iter) { - struct bio_vec *bvec; - struct bvec_iter_all iter_all; + struct bvec_iter_all bv_iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { + bio_for_each_segment_all(bvec, bio, bv_iter) { ssize_t ret; =20 - ret =3D copy_page_to_iter(bvec->bv_page, - bvec->bv_offset, - bvec->bv_len, + ret =3D copy_page_to_iter(bvec.bv_page, + bvec.bv_offset, + bvec.bv_len, &iter); =20 if (!iov_iter_count(&iter)) break; =20 - if (ret < bvec->bv_len) + if (ret < bvec.bv_len) return -EFAULT; } =20 @@ -442,12 +442,12 @@ static void bio_copy_kern_endio(struct bio *bio) static void bio_copy_kern_endio_read(struct bio *bio) { char *p =3D bio->bi_private; - struct bio_vec *bvec; - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; + struct bio_vec bvec; =20 - bio_for_each_segment_all(bvec, bio, iter_all) { - memcpy_from_bvec(p, bvec); - p +=3D bvec->bv_len; + bio_for_each_segment_all(bvec, bio, iter) { + memcpy_from_bvec(p, &bvec); + p +=3D bvec.bv_len; } =20 bio_copy_kern_endio(bio); diff --git a/block/bounce.c b/block/bounce.c index 7cfcb242f9..e701832d76 100644 --- a/block/bounce.c +++ b/block/bounce.c @@ -102,18 +102,18 @@ static void copy_to_high_bio_irq(struct bio *to, stru= ct bio *from) static void bounce_end_io(struct bio *bio) { struct bio *bio_orig =3D bio->bi_private; - struct bio_vec *bvec, orig_vec; + struct bio_vec bvec, orig_vec; struct bvec_iter orig_iter =3D bio_orig->bi_iter; - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; =20 /* * free up bounce indirect pages used */ - bio_for_each_segment_all(bvec, bio, iter_all) { + bio_for_each_segment_all(bvec, bio, iter) { orig_vec =3D bio_iter_iovec(bio_orig, orig_iter); - if (bvec->bv_page !=3D orig_vec.bv_page) { - dec_zone_page_state(bvec->bv_page, NR_BOUNCE); - mempool_free(bvec->bv_page, &page_pool); + if (bvec.bv_page !=3D orig_vec.bv_page) { + dec_zone_page_state(bvec.bv_page, NR_BOUNCE); + mempool_free(bvec.bv_page, &page_pool); } bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len); } diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 147c493a98..98ce12b239 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -373,12 +373,12 @@ static void do_btree_node_write(struct btree *b) bset_sector_offset(&b->keys, i)); =20 if (!bch_bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) { - struct bio_vec *bv; + struct bio_vec bv; void *addr =3D (void *) ((unsigned long) i & ~(PAGE_SIZE - 1)); - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; =20 - bio_for_each_segment_all(bv, b->bio, iter_all) { - memcpy(page_address(bv->bv_page), addr, PAGE_SIZE); + bio_for_each_segment_all(bv, b->bio, iter) { + memcpy(page_address(bv.bv_page), addr, PAGE_SIZE); addr +=3D PAGE_SIZE; } =20 diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 3ba53dc3cc..166bb4fdb4 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1713,12 +1713,12 @@ static struct bio *crypt_alloc_buffer(struct dm_cry= pt_io *io, unsigned int size) =20 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *c= lone) { - struct bio_vec *bv; - struct bvec_iter_all iter_all; + struct bvec_iter_all iter; + struct bio_vec bv; =20 - bio_for_each_segment_all(bv, clone, iter_all) { - BUG_ON(!bv->bv_page); - mempool_free(bv->bv_page, &cc->page_pool); + bio_for_each_segment_all(bv, clone, iter) { + BUG_ON(!bv.bv_page); + mempool_free(bv.bv_page, &cc->page_pool); } } =20 diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 68a9e2d998..4f58cae37e 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -2188,7 +2188,7 @@ static void process_checks(struct r1bio *r1_bio) blk_status_t status =3D sbio->bi_status; struct page **ppages =3D get_resync_pages(pbio)->pages; struct page **spages =3D get_resync_pages(sbio)->pages; - struct bio_vec *bi; + struct bio_vec bi; int page_len[RESYNC_PAGES] =3D { 0 }; struct bvec_iter_all iter_all; =20 @@ -2198,7 +2198,7 @@ static void process_checks(struct r1bio *r1_bio) sbio->bi_status =3D 0; =20 bio_for_each_segment_all(bi, sbio, iter_all) - page_len[j++] =3D bi->bv_len; + page_len[j++] =3D bi.bv_len; =20 if (!status) { for (j =3D vcnt; j-- ; ) { diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 9e1596bb20..92b3396c15 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3804,12 +3804,12 @@ ALLOW_ERROR_INJECTION(open_ctree, ERRNO); static void btrfs_end_super_write(struct bio *bio) { struct btrfs_device *device =3D bio->bi_private; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; struct page *page; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - page =3D bvec->bv_page; + page =3D bvec.bv_page; =20 if (bio->bi_status) { btrfs_warn_rl_in_rcu(device->fs_info, diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 40300e8e5f..5796c99ea1 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -581,34 +581,34 @@ static void end_bio_extent_writepage(struct btrfs_bio= *bbio) { struct bio *bio =3D &bbio->bio; int error =3D blk_status_to_errno(bio->bi_status); - struct bio_vec *bvec; + struct bio_vec bvec; u64 start; u64 end; struct bvec_iter_all iter_all; =20 ASSERT(!bio_flagged(bio, BIO_CLONED)); bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; struct inode *inode =3D page->mapping->host; struct btrfs_fs_info *fs_info =3D btrfs_sb(inode->i_sb); const u32 sectorsize =3D fs_info->sectorsize; =20 /* Our read/write should always be sector aligned. */ - if (!IS_ALIGNED(bvec->bv_offset, sectorsize)) + if (!IS_ALIGNED(bvec.bv_offset, sectorsize)) btrfs_err(fs_info, "partial page write in btrfs with offset %u and length %u", - bvec->bv_offset, bvec->bv_len); - else if (!IS_ALIGNED(bvec->bv_len, sectorsize)) + bvec.bv_offset, bvec.bv_len); + else if (!IS_ALIGNED(bvec.bv_len, sectorsize)) btrfs_info(fs_info, "incomplete page write with offset %u and length %u", - bvec->bv_offset, bvec->bv_len); + bvec.bv_offset, bvec.bv_len); =20 - start =3D page_offset(page) + bvec->bv_offset; - end =3D start + bvec->bv_len - 1; + start =3D page_offset(page) + bvec.bv_offset; + end =3D start + bvec.bv_len - 1; =20 end_extent_writepage(page, error, start, end); =20 - btrfs_page_clear_writeback(fs_info, page, start, bvec->bv_len); + btrfs_page_clear_writeback(fs_info, page, start, bvec.bv_len); } =20 bio_put(bio); @@ -736,7 +736,7 @@ static struct extent_buffer *find_extent_buffer_readpag= e( static void end_bio_extent_readpage(struct btrfs_bio *bbio) { struct bio *bio =3D &bbio->bio; - struct bio_vec *bvec; + struct bio_vec bvec; struct processed_extent processed =3D { 0 }; /* * The offset to the beginning of a bio, since one bio can never be @@ -749,7 +749,7 @@ static void end_bio_extent_readpage(struct btrfs_bio *b= bio) ASSERT(!bio_flagged(bio, BIO_CLONED)); bio_for_each_segment_all(bvec, bio, iter_all) { bool uptodate =3D !bio->bi_status; - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; struct inode *inode =3D page->mapping->host; struct btrfs_fs_info *fs_info =3D btrfs_sb(inode->i_sb); const u32 sectorsize =3D fs_info->sectorsize; @@ -769,19 +769,19 @@ static void end_bio_extent_readpage(struct btrfs_bio = *bbio) * for unaligned offsets, and an error if they don't add up to * a full sector. */ - if (!IS_ALIGNED(bvec->bv_offset, sectorsize)) + if (!IS_ALIGNED(bvec.bv_offset, sectorsize)) btrfs_err(fs_info, "partial page read in btrfs with offset %u and length %u", - bvec->bv_offset, bvec->bv_len); - else if (!IS_ALIGNED(bvec->bv_offset + bvec->bv_len, + bvec.bv_offset, bvec.bv_len); + else if (!IS_ALIGNED(bvec.bv_offset + bvec.bv_len, sectorsize)) btrfs_info(fs_info, "incomplete page read with offset %u and length %u", - bvec->bv_offset, bvec->bv_len); + bvec.bv_offset, bvec.bv_len); =20 - start =3D page_offset(page) + bvec->bv_offset; - end =3D start + bvec->bv_len - 1; - len =3D bvec->bv_len; + start =3D page_offset(page) + bvec.bv_offset; + end =3D start + bvec.bv_len - 1; + len =3D bvec.bv_len; =20 mirror =3D bbio->mirror_num; if (uptodate && !is_data_inode(inode) && @@ -1993,7 +1993,7 @@ static void end_bio_subpage_eb_writepage(struct btrfs= _bio *bbio) { struct bio *bio =3D &bbio->bio; struct btrfs_fs_info *fs_info; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 fs_info =3D btrfs_sb(bio_first_page_all(bio)->mapping->host->i_sb); @@ -2001,12 +2001,12 @@ static void end_bio_subpage_eb_writepage(struct btr= fs_bio *bbio) =20 ASSERT(!bio_flagged(bio, BIO_CLONED)); bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; - u64 bvec_start =3D page_offset(page) + bvec->bv_offset; - u64 bvec_end =3D bvec_start + bvec->bv_len - 1; + struct page *page =3D bvec.bv_page; + u64 bvec_start =3D page_offset(page) + bvec.bv_offset; + u64 bvec_end =3D bvec_start + bvec.bv_len - 1; u64 cur_bytenr =3D bvec_start; =20 - ASSERT(IS_ALIGNED(bvec->bv_len, fs_info->nodesize)); + ASSERT(IS_ALIGNED(bvec.bv_len, fs_info->nodesize)); =20 /* Iterate through all extent buffers in the range */ while (cur_bytenr <=3D bvec_end) { @@ -2050,14 +2050,14 @@ static void end_bio_subpage_eb_writepage(struct btr= fs_bio *bbio) static void end_bio_extent_buffer_writepage(struct btrfs_bio *bbio) { struct bio *bio =3D &bbio->bio; - struct bio_vec *bvec; + struct bio_vec bvec; struct extent_buffer *eb; int done; struct bvec_iter_all iter_all; =20 ASSERT(!bio_flagged(bio, BIO_CLONED)); bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; =20 eb =3D (struct extent_buffer *)page->private; BUG_ON(!eb); diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 642828c1b2..39d8101541 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -1388,7 +1388,7 @@ static struct sector_ptr *find_stripe_sector(struct b= trfs_raid_bio *rbio, static void set_bio_pages_uptodate(struct btrfs_raid_bio *rbio, struct bio= *bio) { const u32 sectorsize =3D rbio->bioc->fs_info->sectorsize; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 ASSERT(!bio_flagged(bio, BIO_CLONED)); @@ -1397,9 +1397,9 @@ static void set_bio_pages_uptodate(struct btrfs_raid_= bio *rbio, struct bio *bio) struct sector_ptr *sector; int pgoff; =20 - for (pgoff =3D bvec->bv_offset; pgoff - bvec->bv_offset < bvec->bv_len; + for (pgoff =3D bvec.bv_offset; pgoff - bvec.bv_offset < bvec.bv_len; pgoff +=3D sectorsize) { - sector =3D find_stripe_sector(rbio, bvec->bv_page, pgoff); + sector =3D find_stripe_sector(rbio, bvec.bv_page, pgoff); ASSERT(sector); if (sector) sector->uptodate =3D 1; @@ -1453,7 +1453,7 @@ static void verify_bio_data_sectors(struct btrfs_raid= _bio *rbio, { struct btrfs_fs_info *fs_info =3D rbio->bioc->fs_info; int total_sector_nr =3D get_bio_sector_nr(rbio, bio); - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 /* No data csum for the whole stripe, no need to verify. */ @@ -1467,8 +1467,8 @@ static void verify_bio_data_sectors(struct btrfs_raid= _bio *rbio, bio_for_each_segment_all(bvec, bio, iter_all) { int bv_offset; =20 - for (bv_offset =3D bvec->bv_offset; - bv_offset < bvec->bv_offset + bvec->bv_len; + for (bv_offset =3D bvec.bv_offset; + bv_offset < bvec.bv_offset + bvec.bv_len; bv_offset +=3D fs_info->sectorsize, total_sector_nr++) { u8 csum_buf[BTRFS_CSUM_SIZE]; u8 *expected_csum =3D rbio->csum_buf + @@ -1479,7 +1479,7 @@ static void verify_bio_data_sectors(struct btrfs_raid= _bio *rbio, if (!test_bit(total_sector_nr, rbio->csum_bitmap)) continue; =20 - ret =3D btrfs_check_sector_csum(fs_info, bvec->bv_page, + ret =3D btrfs_check_sector_csum(fs_info, bvec.bv_page, bv_offset, csum_buf, expected_csum); if (ret < 0) set_bit(total_sector_nr, rbio->error_bitmap); diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index f1708c77a9..1fd0f01d11 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -1651,11 +1651,11 @@ static void z_erofs_decompressqueue_endio(struct bi= o *bio) { struct z_erofs_decompressqueue *q =3D bio->bi_private; blk_status_t err =3D bio->bi_status; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; =20 DBG_BUGON(PageUptodate(page)); DBG_BUGON(z_erofs_page_is_invalidated(page)); diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 1e4db96a04..81a1cc4518 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -99,15 +99,15 @@ static void buffer_io_error(struct buffer_head *bh) =20 static void ext4_finish_bio(struct bio *bio) { - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; struct page *bounce_page =3D NULL; struct buffer_head *bh, *head; - unsigned bio_start =3D bvec->bv_offset; - unsigned bio_end =3D bio_start + bvec->bv_len; + unsigned bio_start =3D bvec.bv_offset; + unsigned bio_end =3D bio_start + bvec.bv_len; unsigned under_io =3D 0; unsigned long flags; =20 diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c index c61dc8a7c0..ce42b3d5c9 100644 --- a/fs/ext4/readpage.c +++ b/fs/ext4/readpage.c @@ -69,11 +69,11 @@ struct bio_post_read_ctx { static void __read_end_io(struct bio *bio) { struct page *page; - struct bio_vec *bv; + struct bio_vec bv; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bv, bio, iter_all) { - page =3D bv->bv_page; + page =3D bv.bv_page; =20 if (bio->bi_status) ClearPageUptodate(page); diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 06b552a0ab..e44bd8586f 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -139,12 +139,12 @@ struct bio_post_read_ctx { */ static void f2fs_finish_read_bio(struct bio *bio, bool in_task) { - struct bio_vec *bv; + struct bio_vec bv; struct bvec_iter_all iter_all; struct bio_post_read_ctx *ctx =3D bio->bi_private; =20 bio_for_each_segment_all(bv, bio, iter_all) { - struct page *page =3D bv->bv_page; + struct page *page =3D bv.bv_page; =20 if (f2fs_is_compressed_page(page)) { if (ctx && !ctx->decompression_attempted) @@ -189,11 +189,11 @@ static void f2fs_verify_bio(struct work_struct *work) * as those were handled separately by f2fs_end_read_compressed_page(). */ if (may_have_compressed_pages) { - struct bio_vec *bv; + struct bio_vec bv; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bv, bio, iter_all) { - struct page *page =3D bv->bv_page; + struct page *page =3D bv.bv_page; =20 if (!f2fs_is_compressed_page(page) && !fsverity_verify_page(page)) { @@ -241,13 +241,13 @@ static void f2fs_verify_and_finish_bio(struct bio *bi= o, bool in_task) static void f2fs_handle_step_decompress(struct bio_post_read_ctx *ctx, bool in_task) { - struct bio_vec *bv; + struct bio_vec bv; struct bvec_iter_all iter_all; bool all_compressed =3D true; block_t blkaddr =3D ctx->fs_blkaddr; =20 bio_for_each_segment_all(bv, ctx->bio, iter_all) { - struct page *page =3D bv->bv_page; + struct page *page =3D bv.bv_page; =20 if (f2fs_is_compressed_page(page)) f2fs_end_read_compressed_page(page, false, blkaddr, @@ -327,7 +327,7 @@ static void f2fs_read_end_io(struct bio *bio) static void f2fs_write_end_io(struct bio *bio) { struct f2fs_sb_info *sbi; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 iostat_update_and_unbind_ctx(bio); @@ -337,7 +337,7 @@ static void f2fs_write_end_io(struct bio *bio) bio->bi_status =3D BLK_STS_IOERR; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; enum count_type type =3D WB_DATA_TYPE(page); =20 if (page_private_dummy(page)) { @@ -583,7 +583,7 @@ static void __submit_merged_bio(struct f2fs_bio_info *i= o) static bool __has_merged_page(struct bio *bio, struct inode *inode, struct page *page, nid_t ino) { - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 if (!bio) @@ -593,7 +593,7 @@ static bool __has_merged_page(struct bio *bio, struct i= node *inode, return true; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *target =3D bvec->bv_page; + struct page *target =3D bvec.bv_page; =20 if (fscrypt_is_bounce_page(target)) { target =3D fscrypt_pagecache_page(target); diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index 1902413d5d..7f62fe8eb7 100644 --- a/fs/gfs2/lops.c +++ b/fs/gfs2/lops.c @@ -202,7 +202,7 @@ static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, static void gfs2_end_log_write(struct bio *bio) { struct gfs2_sbd *sdp =3D bio->bi_private; - struct bio_vec *bvec; + struct bio_vec bvec; struct page *page; struct bvec_iter_all iter_all; =20 @@ -217,9 +217,9 @@ static void gfs2_end_log_write(struct bio *bio) } =20 bio_for_each_segment_all(bvec, bio, iter_all) { - page =3D bvec->bv_page; + page =3D bvec.bv_page; if (page_has_buffers(page)) - gfs2_end_log_write_bh(sdp, bvec, bio->bi_status); + gfs2_end_log_write_bh(sdp, &bvec, bio->bi_status); else mempool_free(page, gfs2_page_pool); } @@ -395,11 +395,11 @@ static void gfs2_log_write_page(struct gfs2_sbd *sdp,= struct page *page) static void gfs2_end_log_read(struct bio *bio) { struct page *page; - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - page =3D bvec->bv_page; + page =3D bvec.bv_page; if (bio->bi_status) { int err =3D blk_status_to_errno(bio->bi_status); =20 diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c index 924361fa51..832572784e 100644 --- a/fs/gfs2/meta_io.c +++ b/fs/gfs2/meta_io.c @@ -193,15 +193,15 @@ struct buffer_head *gfs2_meta_new(struct gfs2_glock *= gl, u64 blkno) =20 static void gfs2_meta_read_endio(struct bio *bio) { - struct bio_vec *bvec; + struct bio_vec bvec; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bvec, bio, iter_all) { - struct page *page =3D bvec->bv_page; + struct page *page =3D bvec.bv_page; struct buffer_head *bh =3D page_buffers(page); - unsigned int len =3D bvec->bv_len; + unsigned int len =3D bvec.bv_len; =20 - while (bh_offset(bh) < bvec->bv_offset) + while (bh_offset(bh) < bvec.bv_offset) bh =3D bh->b_this_page; do { struct buffer_head *next =3D bh->b_this_page; diff --git a/fs/mpage.c b/fs/mpage.c index 22b9de5ddd..49505456ba 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -45,11 +45,11 @@ */ static void mpage_end_io(struct bio *bio) { - struct bio_vec *bv; + struct bio_vec bv; struct bvec_iter_all iter_all; =20 bio_for_each_segment_all(bv, bio, iter_all) { - struct page *page =3D bv->bv_page; + struct page *page =3D bv.bv_page; page_endio(page, bio_op(bio), blk_status_to_errno(bio->bi_status)); } diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c index bed3bb8b27..83e8b44518 100644 --- a/fs/squashfs/block.c +++ b/fs/squashfs/block.c @@ -35,30 +35,33 @@ static int copy_bio_to_actor(struct bio *bio, int offset, int req_length) { void *actor_addr; - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; + struct bio_vec bvec; int copied_bytes =3D 0; int actor_offset =3D 0; + int bytes_to_copy; =20 squashfs_actor_nobuff(actor); actor_addr =3D squashfs_first_page(actor); =20 - if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) - return 0; + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); =20 - while (copied_bytes < req_length) { - int bytes_to_copy =3D min_t(int, bvec->bv_len - offset, + while (copied_bytes < req_length && + iter.idx < bio->bi_vcnt) { + bvec =3D bio_iter_all_peek(bio, &iter); + + bytes_to_copy =3D min_t(int, bvec.bv_len, PAGE_SIZE - actor_offset); =20 bytes_to_copy =3D min_t(int, bytes_to_copy, req_length - copied_bytes); if (!IS_ERR(actor_addr)) - memcpy(actor_addr + actor_offset, bvec_virt(bvec) + - offset, bytes_to_copy); + memcpy(actor_addr + actor_offset, bvec_virt(&bvec), + bytes_to_copy); =20 actor_offset +=3D bytes_to_copy; copied_bytes +=3D bytes_to_copy; - offset +=3D bytes_to_copy; =20 if (actor_offset >=3D PAGE_SIZE) { actor_addr =3D squashfs_next_page(actor); @@ -66,11 +69,8 @@ static int copy_bio_to_actor(struct bio *bio, break; actor_offset =3D 0; } - if (offset >=3D bvec->bv_len) { - if (!bio_next_segment(bio, &iter_all)) - break; - offset =3D 0; - } + + bio_iter_all_advance(bio, &iter, bytes_to_copy); } squashfs_finish_page(actor); return copied_bytes; @@ -159,8 +159,10 @@ int squashfs_read_data(struct super_block *sb, u64 ind= ex, int length, * Metadata block. */ const u8 *data; - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; + struct bio_vec bvec; + + bvec_iter_all_init(&iter); =20 if (index + 2 > msblk->bytes_used) { res =3D -EIO; @@ -170,21 +172,25 @@ int squashfs_read_data(struct super_block *sb, u64 in= dex, int length, if (res) goto out; =20 - if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) { + bvec =3D bio_iter_all_peek(bio, &iter); + + if (WARN_ON_ONCE(!bvec.bv_len)) { res =3D -EIO; goto out_free_bio; } /* Extract the length of the metadata block */ - data =3D bvec_virt(bvec); + data =3D bvec_virt(&bvec); length =3D data[offset]; - if (offset < bvec->bv_len - 1) { + if (offset < bvec.bv_len - 1) { length |=3D data[offset + 1] << 8; } else { - if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) { + bio_iter_all_advance(bio, &iter, bvec.bv_len); + + if (WARN_ON_ONCE(!bvec.bv_len)) { res =3D -EIO; goto out_free_bio; } - data =3D bvec_virt(bvec); + data =3D bvec_virt(&bvec); length |=3D data[0] << 8; } bio_free_pages(bio); diff --git a/fs/squashfs/lz4_wrapper.c b/fs/squashfs/lz4_wrapper.c index 49797729f1..bd0dd787d2 100644 --- a/fs/squashfs/lz4_wrapper.c +++ b/fs/squashfs/lz4_wrapper.c @@ -92,20 +92,23 @@ static int lz4_uncompress(struct squashfs_sb_info *msbl= k, void *strm, struct bio *bio, int offset, int length, struct squashfs_page_actor *output) { - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; + struct bio_vec bvec; struct squashfs_lz4 *stream =3D strm; void *buff =3D stream->input, *data; int bytes =3D length, res; =20 - while (bio_next_segment(bio, &iter_all)) { - int avail =3D min(bytes, ((int)bvec->bv_len) - offset); + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); =20 - data =3D bvec_virt(bvec); - memcpy(buff, data + offset, avail); + bio_for_each_segment_all_continue(bvec, bio, iter) { + unsigned avail =3D min_t(unsigned, bytes, bvec.bv_len); + + memcpy(buff, bvec_virt(&bvec), avail); buff +=3D avail; bytes -=3D avail; - offset =3D 0; + if (!bytes) + break; } =20 res =3D LZ4_decompress_safe(stream->input, stream->output, diff --git a/fs/squashfs/lzo_wrapper.c b/fs/squashfs/lzo_wrapper.c index d216aeefa8..bccfcfa12e 100644 --- a/fs/squashfs/lzo_wrapper.c +++ b/fs/squashfs/lzo_wrapper.c @@ -66,21 +66,24 @@ static int lzo_uncompress(struct squashfs_sb_info *msbl= k, void *strm, struct bio *bio, int offset, int length, struct squashfs_page_actor *output) { - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; + struct bio_vec bvec; struct squashfs_lzo *stream =3D strm; void *buff =3D stream->input, *data; int bytes =3D length, res; size_t out_len =3D output->length; =20 - while (bio_next_segment(bio, &iter_all)) { - int avail =3D min(bytes, ((int)bvec->bv_len) - offset); + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); =20 - data =3D bvec_virt(bvec); - memcpy(buff, data + offset, avail); + bio_for_each_segment_all_continue(bvec, bio, iter) { + unsigned avail =3D min_t(unsigned, bytes, bvec.bv_len); + + memcpy(buff, bvec_virt(&bvec), avail); buff +=3D avail; bytes -=3D avail; - offset =3D 0; + if (!bytes) + break; } =20 res =3D lzo1x_decompress_safe(stream->input, (size_t)length, diff --git a/fs/squashfs/xz_wrapper.c b/fs/squashfs/xz_wrapper.c index 6c49481a2f..6cf0e11e3b 100644 --- a/fs/squashfs/xz_wrapper.c +++ b/fs/squashfs/xz_wrapper.c @@ -120,8 +120,7 @@ static int squashfs_xz_uncompress(struct squashfs_sb_in= fo *msblk, void *strm, struct bio *bio, int offset, int length, struct squashfs_page_actor *output) { - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; int total =3D 0, error =3D 0; struct squashfs_xz *stream =3D strm; =20 @@ -136,26 +135,28 @@ static int squashfs_xz_uncompress(struct squashfs_sb_= info *msblk, void *strm, goto finish; } =20 + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); + for (;;) { enum xz_ret xz_err; =20 if (stream->buf.in_pos =3D=3D stream->buf.in_size) { - const void *data; - int avail; + struct bio_vec bvec =3D bio_iter_all_peek(bio, &iter); + unsigned avail =3D min_t(unsigned, length, bvec.bv_len); =20 - if (!bio_next_segment(bio, &iter_all)) { + if (iter.idx >=3D bio->bi_vcnt) { /* XZ_STREAM_END must be reached. */ error =3D -EIO; break; } =20 - avail =3D min(length, ((int)bvec->bv_len) - offset); - data =3D bvec_virt(bvec); length -=3D avail; - stream->buf.in =3D data + offset; + stream->buf.in =3D bvec_virt(&bvec); stream->buf.in_size =3D avail; stream->buf.in_pos =3D 0; - offset =3D 0; + + bio_iter_all_advance(bio, &iter, avail); } =20 if (stream->buf.out_pos =3D=3D stream->buf.out_size) { diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c index cbb7afe7bc..981ca5e410 100644 --- a/fs/squashfs/zlib_wrapper.c +++ b/fs/squashfs/zlib_wrapper.c @@ -53,8 +53,7 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk= , void *strm, struct bio *bio, int offset, int length, struct squashfs_page_actor *output) { - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; int zlib_init =3D 0, error =3D 0; z_stream *stream =3D strm; =20 @@ -67,25 +66,28 @@ static int zlib_uncompress(struct squashfs_sb_info *msb= lk, void *strm, goto finish; } =20 + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); + for (;;) { int zlib_err; =20 if (stream->avail_in =3D=3D 0) { - const void *data; + struct bio_vec bvec =3D bio_iter_all_peek(bio, &iter); int avail; =20 - if (!bio_next_segment(bio, &iter_all)) { + if (iter.idx >=3D bio->bi_vcnt) { /* Z_STREAM_END must be reached. */ error =3D -EIO; break; } =20 - avail =3D min(length, ((int)bvec->bv_len) - offset); - data =3D bvec_virt(bvec); + avail =3D min_t(unsigned, length, bvec.bv_len); length -=3D avail; - stream->next_in =3D data + offset; + stream->next_in =3D bvec_virt(&bvec); stream->avail_in =3D avail; - offset =3D 0; + + bio_iter_all_advance(bio, &iter, avail); } =20 if (stream->avail_out =3D=3D 0) { diff --git a/fs/squashfs/zstd_wrapper.c b/fs/squashfs/zstd_wrapper.c index 0e407c4d8b..658e5d462a 100644 --- a/fs/squashfs/zstd_wrapper.c +++ b/fs/squashfs/zstd_wrapper.c @@ -68,8 +68,7 @@ static int zstd_uncompress(struct squashfs_sb_info *msblk= , void *strm, int error =3D 0; zstd_in_buffer in_buf =3D { NULL, 0, 0 }; zstd_out_buffer out_buf =3D { NULL, 0, 0 }; - struct bvec_iter_all iter_all =3D {}; - struct bio_vec *bvec =3D bvec_init_iter_all(&iter_all); + struct bvec_iter_all iter; =20 stream =3D zstd_init_dstream(wksp->window_size, wksp->mem, wksp->mem_size= ); =20 @@ -85,25 +84,27 @@ static int zstd_uncompress(struct squashfs_sb_info *msb= lk, void *strm, goto finish; } =20 + bvec_iter_all_init(&iter); + bio_iter_all_advance(bio, &iter, offset); + for (;;) { size_t zstd_err; =20 if (in_buf.pos =3D=3D in_buf.size) { - const void *data; - int avail; + struct bio_vec bvec =3D bio_iter_all_peek(bio, &iter); + unsigned avail =3D min_t(unsigned, length, bvec.bv_len); =20 - if (!bio_next_segment(bio, &iter_all)) { + if (iter.idx >=3D bio->bi_vcnt) { error =3D -EIO; break; } =20 - avail =3D min(length, ((int)bvec->bv_len) - offset); - data =3D bvec_virt(bvec); length -=3D avail; - in_buf.src =3D data + offset; + in_buf.src =3D bvec_virt(&bvec); in_buf.size =3D avail; in_buf.pos =3D 0; - offset =3D 0; + + bio_iter_all_advance(bio, &iter, avail); } =20 if (out_buf.pos =3D=3D out_buf.size) { diff --git a/include/linux/bio.h b/include/linux/bio.h index 3536f28c05..f86c7190c3 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -78,22 +78,40 @@ static inline void *bio_data(struct bio *bio) return NULL; } =20 -static inline bool bio_next_segment(const struct bio *bio, - struct bvec_iter_all *iter) +static inline struct bio_vec bio_iter_all_peek(const struct bio *bio, + struct bvec_iter_all *iter) { - if (iter->idx >=3D bio->bi_vcnt) - return false; + if (WARN_ON(iter->idx >=3D bio->bi_vcnt)) + return (struct bio_vec) { NULL }; =20 - bvec_advance(&bio->bi_io_vec[iter->idx], iter); - return true; + return bvec_iter_all_peek(bio->bi_io_vec, iter); +} + +static inline void bio_iter_all_advance(const struct bio *bio, + struct bvec_iter_all *iter, + unsigned bytes) +{ + bvec_iter_all_advance(bio->bi_io_vec, iter, bytes); + + WARN_ON(iter->idx > bio->bi_vcnt || + (iter->idx =3D=3D bio->bi_vcnt && iter->done)); } =20 +#define bio_for_each_segment_all_continue(bvl, bio, iter) \ + for (; \ + iter.idx < bio->bi_vcnt && \ + ((bvl =3D bio_iter_all_peek(bio, &iter)), true); \ + bio_iter_all_advance((bio), &iter, bvl.bv_len)) + /* * 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 */ -#define bio_for_each_segment_all(bvl, bio, iter) \ - for (bvl =3D bvec_init_iter_all(&iter); bio_next_segment((bio), &iter); ) +#define bio_for_each_segment_all(bvl, bio, iter) \ + for (bvec_iter_all_init(&iter); \ + iter.idx < (bio)->bi_vcnt && \ + ((bvl =3D bio_iter_all_peek((bio), &iter)), true); \ + bio_iter_all_advance((bio), &iter, bvl.bv_len)) =20 static inline void bio_advance_iter(const struct bio *bio, struct bvec_iter *iter, unsigned int bytes) diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 555aae5448..635fb54143 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -85,12 +85,6 @@ struct bvec_iter { current bvec */ } __packed; =20 -struct bvec_iter_all { - struct bio_vec bv; - int idx; - unsigned done; -}; - /* * various member access, note that bio_data should of course not be used * on highmem page vectors @@ -184,7 +178,10 @@ static inline void bvec_iter_advance_single(const stru= ct bio_vec *bv, ((bvl =3D bvec_iter_bvec((bio_vec), (iter))), 1); \ bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len)) =20 -/* for iterating one bio from start to end */ +/* + * bvec_iter_all: for advancing over a bio as it was originally created, b= ut + * with the usual bio_for_each_segment interface - nonstandard, do not use: + */ #define BVEC_ITER_ALL_INIT (struct bvec_iter) \ { \ .bi_sector =3D 0, \ @@ -193,33 +190,45 @@ static inline void bvec_iter_advance_single(const str= uct bio_vec *bv, .bi_bvec_done =3D 0, \ } =20 -static inline struct bio_vec *bvec_init_iter_all(struct bvec_iter_all *ite= r_all) +/* + * bvec_iter_all: for advancing over individual pages in a bio, as it was = when + * it was first created: + */ +struct bvec_iter_all { + int idx; + unsigned done; +}; + +static inline void bvec_iter_all_init(struct bvec_iter_all *iter_all) { iter_all->done =3D 0; iter_all->idx =3D 0; +} =20 - return &iter_all->bv; +static inline struct bio_vec bvec_iter_all_peek(const struct bio_vec *bvec, + struct bvec_iter_all *iter) +{ + struct bio_vec bv =3D bvec[iter->idx]; + + bv.bv_offset +=3D iter->done; + bv.bv_len -=3D iter->done; + + bv.bv_page +=3D bv.bv_offset >> PAGE_SHIFT; + bv.bv_offset &=3D ~PAGE_MASK; + bv.bv_len =3D min_t(unsigned, PAGE_SIZE - bv.bv_offset, bv.bv_len); + + return bv; } =20 -static inline void bvec_advance(const struct bio_vec *bvec, - struct bvec_iter_all *iter_all) +static inline void bvec_iter_all_advance(const struct bio_vec *bvec, + struct bvec_iter_all *iter, + unsigned bytes) { - struct bio_vec *bv =3D &iter_all->bv; - - if (iter_all->done) { - bv->bv_page++; - bv->bv_offset =3D 0; - } else { - bv->bv_page =3D bvec->bv_page + (bvec->bv_offset >> PAGE_SHIFT); - bv->bv_offset =3D bvec->bv_offset & ~PAGE_MASK; - } - bv->bv_len =3D min_t(unsigned int, PAGE_SIZE - bv->bv_offset, - bvec->bv_len - iter_all->done); - iter_all->done +=3D bv->bv_len; + iter->done +=3D bytes; =20 - if (iter_all->done =3D=3D bvec->bv_len) { - iter_all->idx++; - iter_all->done =3D 0; + while (iter->done && iter->done >=3D bvec[iter->idx].bv_len) { + iter->done -=3D bvec[iter->idx].bv_len; + iter->idx++; } } =20 --=20 2.40.1