Re: [PATCH v2 1/5] block: Rework bio_for_each_segment_all()

From: Ming Lei
Date: Mon Jun 05 2023 - 22:05:00 EST

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On Mon, Jun 05, 2023 at 05:27:13PM -0400, Kent Overstreet wrote:
> 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().

by-value is more readable & clean, the current by-reference is just for aligning
with original interface.

>
> - We now provide bio_for_each_segment_all_continue(), for squashfs:
> this makes their code clearer.

Probably it is better to move the new helper into new patch, but I guess
it could be hard for this patch.

>
> Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> Cc: Jens Axboe <axboe@xxxxxxxxx>
> Cc: linux-block@xxxxxxxxxxxxxxx
> Cc: Ming Lei <ming.lei@xxxxxxxxxx>
> Cc: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
> ---
> 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/f2fs/data.c | 20 ++++++-------
> fs/gfs2/lops.c | 10 +++----
> fs/gfs2/meta_io.c | 8 ++---
> 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 | 28 ++++++++++++-----
> include/linux/bvec.h | 61 ++++++++++++++++++++++----------------
> 21 files changed, 242 insertions(+), 205 deletions(-)
>
> diff --git a/block/bio.c b/block/bio.c
> index 798cc4cf3b..2af9f50643 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -1163,13 +1163,13 @@ EXPORT_SYMBOL(bio_add_folio);
>
> 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;
>
> - bio_for_each_segment_all(bvec, bio, iter_all) {
> - if (mark_dirty && !PageCompound(bvec->bv_page))
> - set_page_dirty_lock(bvec->bv_page);
> - bio_release_page(bio, 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);
> + bio_release_page(bio, bvec.bv_page);
> }
> }
> EXPORT_SYMBOL_GPL(__bio_release_pages);
> @@ -1435,11 +1435,11 @@ EXPORT_SYMBOL(bio_copy_data);
>
> 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;
>
> - 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);
>
> @@ -1474,12 +1474,12 @@ 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;
>
> - 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);
> }
> }
>
> @@ -1522,12 +1522,12 @@ static void bio_dirty_fn(struct work_struct *work)
>
> 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;
>
> - 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;
> }
>
> diff --git a/block/blk-map.c b/block/blk-map.c
> index 3551c3ff17..524d84011f 100644
> --- a/block/blk-map.c
> +++ b/block/blk-map.c
> @@ -47,21 +47,21 @@ static struct bio_map_data *bio_alloc_map_data(struct iov_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;
>
> - bio_for_each_segment_all(bvec, bio, iter_all) {
> + bio_for_each_segment_all(bvec, bio, bv_iter) {
> ssize_t ret;
>
> - ret = copy_page_from_iter(bvec->bv_page,
> - bvec->bv_offset,
> - bvec->bv_len,
> + ret = copy_page_from_iter(bvec.bv_page,
> + bvec.bv_offset,
> + bvec.bv_len,
> iter);
>
> if (!iov_iter_count(iter))
> break;
>
> - if (ret < bvec->bv_len)
> + if (ret < bvec.bv_len)
> return -EFAULT;
> }
>
> @@ -78,21 +78,21 @@ static int bio_copy_from_iter(struct bio *bio, struct iov_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;
>
> - bio_for_each_segment_all(bvec, bio, iter_all) {
> + bio_for_each_segment_all(bvec, bio, bv_iter) {
> ssize_t ret;
>
> - ret = copy_page_to_iter(bvec->bv_page,
> - bvec->bv_offset,
> - bvec->bv_len,
> + ret = copy_page_to_iter(bvec.bv_page,
> + bvec.bv_offset,
> + bvec.bv_len,
> &iter);
>
> if (!iov_iter_count(&iter))
> break;
>
> - if (ret < bvec->bv_len)
> + if (ret < bvec.bv_len)
> return -EFAULT;
> }
>
> @@ -443,12 +443,12 @@ static void bio_copy_kern_endio(struct bio *bio)
> static void bio_copy_kern_endio_read(struct bio *bio)
> {
> char *p = bio->bi_private;
> - struct bio_vec *bvec;
> - struct bvec_iter_all iter_all;
> + struct bvec_iter_all iter;
> + struct bio_vec bvec;
>
> - bio_for_each_segment_all(bvec, bio, iter_all) {
> - memcpy_from_bvec(p, bvec);
> - p += bvec->bv_len;
> + bio_for_each_segment_all(bvec, bio, iter) {
> + memcpy_from_bvec(p, &bvec);
> + p += bvec.bv_len;
> }
>
> 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, struct bio *from)
> static void bounce_end_io(struct bio *bio)
> {
> struct bio *bio_orig = bio->bi_private;
> - struct bio_vec *bvec, orig_vec;
> + struct bio_vec bvec, orig_vec;
> struct bvec_iter orig_iter = bio_orig->bi_iter;
> - struct bvec_iter_all iter_all;
> + struct bvec_iter_all iter;
>
> /*
> * 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 = bio_iter_iovec(bio_orig, orig_iter);
> - if (bvec->bv_page != orig_vec.bv_page) {
> - dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
> - mempool_free(bvec->bv_page, &page_pool);
> + if (bvec.bv_page != 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));
>
> if (!bch_bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) {
> - struct bio_vec *bv;
> + struct bio_vec bv;
> void *addr = (void *) ((unsigned long) i & ~(PAGE_SIZE - 1));
> - struct bvec_iter_all iter_all;
> + struct bvec_iter_all iter;
>
> - 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 += PAGE_SIZE;
> }
>
> diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
> index 8b47b913ee..8ffc225f7b 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_crypt_io *io, unsigned int size)
>
> static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
> {
> - struct bio_vec *bv;
> - struct bvec_iter_all iter_all;
> + struct bvec_iter_all iter;
> + struct bio_vec bv;
>
> - 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);
> }
> }
>
> 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 = sbio->bi_status;
> struct page **ppages = get_resync_pages(pbio)->pages;
> struct page **spages = get_resync_pages(sbio)->pages;
> - struct bio_vec *bi;
> + struct bio_vec bi;
> int page_len[RESYNC_PAGES] = { 0 };
> struct bvec_iter_all iter_all;
>
> @@ -2198,7 +2198,7 @@ static void process_checks(struct r1bio *r1_bio)
> sbio->bi_status = 0;
>
> bio_for_each_segment_all(bi, sbio, iter_all)
> - page_len[j++] = bi->bv_len;
> + page_len[j++] = bi.bv_len;
>
> if (!status) {
> for (j = vcnt; j-- ; ) {
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index fbf9006c62..10326f978a 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -3807,12 +3807,12 @@ ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
> static void btrfs_end_super_write(struct bio *bio)
> {
> struct btrfs_device *device = bio->bi_private;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
> struct page *page;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - page = bvec->bv_page;
> + page = bvec.bv_page;
>
> 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 a1adadd5d2..e3b7fbbad7 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -573,34 +573,34 @@ static void end_bio_extent_writepage(struct btrfs_bio *bbio)
> {
> struct bio *bio = &bbio->bio;
> int error = 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;
>
> ASSERT(!bio_flagged(bio, BIO_CLONED));
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
> struct inode *inode = page->mapping->host;
> struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
> const u32 sectorsize = fs_info->sectorsize;
>
> /* 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);
>
> - start = page_offset(page) + bvec->bv_offset;
> - end = start + bvec->bv_len - 1;
> + start = page_offset(page) + bvec.bv_offset;
> + end = start + bvec.bv_len - 1;
>
> end_extent_writepage(page, error, start, end);
>
> - btrfs_page_clear_writeback(fs_info, page, start, bvec->bv_len);
> + btrfs_page_clear_writeback(fs_info, page, start, bvec.bv_len);
> }
>
> bio_put(bio);
> @@ -728,7 +728,7 @@ static struct extent_buffer *find_extent_buffer_readpage(
> static void end_bio_extent_readpage(struct btrfs_bio *bbio)
> {
> struct bio *bio = &bbio->bio;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct processed_extent processed = { 0 };
> /*
> * The offset to the beginning of a bio, since one bio can never be
> @@ -741,7 +741,7 @@ static void end_bio_extent_readpage(struct btrfs_bio *bbio)
> ASSERT(!bio_flagged(bio, BIO_CLONED));
> bio_for_each_segment_all(bvec, bio, iter_all) {
> bool uptodate = !bio->bi_status;
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
> struct inode *inode = page->mapping->host;
> struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
> const u32 sectorsize = fs_info->sectorsize;
> @@ -761,19 +761,19 @@ 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);
>
> - start = page_offset(page) + bvec->bv_offset;
> - end = start + bvec->bv_len - 1;
> - len = bvec->bv_len;
> + start = page_offset(page) + bvec.bv_offset;
> + end = start + bvec.bv_len - 1;
> + len = bvec.bv_len;
>
> mirror = bbio->mirror_num;
> if (uptodate && !is_data_inode(inode) &&
> @@ -1879,7 +1879,7 @@ static void end_bio_subpage_eb_writepage(struct btrfs_bio *bbio)
> {
> struct bio *bio = &bbio->bio;
> struct btrfs_fs_info *fs_info;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
>
> fs_info = btrfs_sb(bio_first_page_all(bio)->mapping->host->i_sb);
> @@ -1887,12 +1887,12 @@ static void end_bio_subpage_eb_writepage(struct btrfs_bio *bbio)
>
> ASSERT(!bio_flagged(bio, BIO_CLONED));
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> - u64 bvec_start = page_offset(page) + bvec->bv_offset;
> - u64 bvec_end = bvec_start + bvec->bv_len - 1;
> + struct page *page = bvec.bv_page;
> + u64 bvec_start = page_offset(page) + bvec.bv_offset;
> + u64 bvec_end = bvec_start + bvec.bv_len - 1;
> u64 cur_bytenr = bvec_start;
>
> - ASSERT(IS_ALIGNED(bvec->bv_len, fs_info->nodesize));
> + ASSERT(IS_ALIGNED(bvec.bv_len, fs_info->nodesize));
>
> /* Iterate through all extent buffers in the range */
> while (cur_bytenr <= bvec_end) {
> @@ -1936,14 +1936,14 @@ static void end_bio_subpage_eb_writepage(struct btrfs_bio *bbio)
> static void end_bio_extent_buffer_writepage(struct btrfs_bio *bbio)
> {
> struct bio *bio = &bbio->bio;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct extent_buffer *eb;
> int done;
> struct bvec_iter_all iter_all;
>
> ASSERT(!bio_flagged(bio, BIO_CLONED));
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
>
> eb = (struct extent_buffer *)page->private;
> BUG_ON(!eb);
> diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
> index 2fab37f062..8da6097c42 100644
> --- a/fs/btrfs/raid56.c
> +++ b/fs/btrfs/raid56.c
> @@ -1393,7 +1393,7 @@ static struct sector_ptr *find_stripe_sector(struct btrfs_raid_bio *rbio,
> static void set_bio_pages_uptodate(struct btrfs_raid_bio *rbio, struct bio *bio)
> {
> const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
>
> ASSERT(!bio_flagged(bio, BIO_CLONED));
> @@ -1402,9 +1402,9 @@ static void set_bio_pages_uptodate(struct btrfs_raid_bio *rbio, struct bio *bio)
> struct sector_ptr *sector;
> int pgoff;
>
> - for (pgoff = bvec->bv_offset; pgoff - bvec->bv_offset < bvec->bv_len;
> + for (pgoff = bvec.bv_offset; pgoff - bvec.bv_offset < bvec.bv_len;
> pgoff += sectorsize) {
> - sector = find_stripe_sector(rbio, bvec->bv_page, pgoff);
> + sector = find_stripe_sector(rbio, bvec.bv_page, pgoff);
> ASSERT(sector);
> if (sector)
> sector->uptodate = 1;
> @@ -1458,7 +1458,7 @@ static void verify_bio_data_sectors(struct btrfs_raid_bio *rbio,
> {
> struct btrfs_fs_info *fs_info = rbio->bioc->fs_info;
> int total_sector_nr = get_bio_sector_nr(rbio, bio);
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
>
> /* No data csum for the whole stripe, no need to verify. */
> @@ -1472,8 +1472,8 @@ static void verify_bio_data_sectors(struct btrfs_raid_bio *rbio,
> bio_for_each_segment_all(bvec, bio, iter_all) {
> int bv_offset;
>
> - for (bv_offset = bvec->bv_offset;
> - bv_offset < bvec->bv_offset + bvec->bv_len;
> + for (bv_offset = bvec.bv_offset;
> + bv_offset < bvec.bv_offset + bvec.bv_len;
> bv_offset += fs_info->sectorsize, total_sector_nr++) {
> u8 csum_buf[BTRFS_CSUM_SIZE];
> u8 *expected_csum = rbio->csum_buf +
> @@ -1484,7 +1484,7 @@ static void verify_bio_data_sectors(struct btrfs_raid_bio *rbio,
> if (!test_bit(total_sector_nr, rbio->csum_bitmap))
> continue;
>
> - ret = btrfs_check_sector_csum(fs_info, bvec->bv_page,
> + ret = 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 45f21db230..fc0ce6d685 100644
> --- a/fs/erofs/zdata.c
> +++ b/fs/erofs/zdata.c
> @@ -1648,11 +1648,11 @@ static void z_erofs_decompressqueue_endio(struct bio *bio)
> {
> struct z_erofs_decompressqueue *q = bio->bi_private;
> blk_status_t err = bio->bi_status;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
>
> DBG_BUGON(PageUptodate(page));
> DBG_BUGON(z_erofs_page_is_invalidated(page));
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 7165b1202f..d687e11bdf 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 = bio->bi_private;
>
> bio_for_each_segment_all(bv, bio, iter_all) {
> - struct page *page = bv->bv_page;
> + struct page *page = bv.bv_page;
>
> 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;
>
> bio_for_each_segment_all(bv, bio, iter_all) {
> - struct page *page = bv->bv_page;
> + struct page *page = bv.bv_page;
>
> if (!f2fs_is_compressed_page(page) &&
> !fsverity_verify_page(page)) {
> @@ -241,13 +241,13 @@ static void f2fs_verify_and_finish_bio(struct bio *bio, 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 = true;
> block_t blkaddr = ctx->fs_blkaddr;
>
> bio_for_each_segment_all(bv, ctx->bio, iter_all) {
> - struct page *page = bv->bv_page;
> + struct page *page = bv.bv_page;
>
> 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;
>
> iostat_update_and_unbind_ctx(bio);
> @@ -337,7 +337,7 @@ static void f2fs_write_end_io(struct bio *bio)
> bio->bi_status = BLK_STS_IOERR;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
> enum count_type type = WB_DATA_TYPE(page);
>
> if (page_private_dummy(page)) {
> @@ -583,7 +583,7 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
> 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;
>
> if (!bio)
> @@ -593,7 +593,7 @@ static bool __has_merged_page(struct bio *bio, struct inode *inode,
> return true;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *target = bvec->bv_page;
> + struct page *target = bvec.bv_page;
>
> if (fscrypt_is_bounce_page(target)) {
> target = 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 = bio->bi_private;
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct page *page;
> struct bvec_iter_all iter_all;
>
> @@ -217,9 +217,9 @@ static void gfs2_end_log_write(struct bio *bio)
> }
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - page = bvec->bv_page;
> + page = 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;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - page = bvec->bv_page;
> + page = bvec.bv_page;
> if (bio->bi_status) {
> int err = blk_status_to_errno(bio->bi_status);
>
> 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)
>
> static void gfs2_meta_read_endio(struct bio *bio)
> {
> - struct bio_vec *bvec;
> + struct bio_vec bvec;
> struct bvec_iter_all iter_all;
>
> bio_for_each_segment_all(bvec, bio, iter_all) {
> - struct page *page = bvec->bv_page;
> + struct page *page = bvec.bv_page;
> struct buffer_head *bh = page_buffers(page);
> - unsigned int len = bvec->bv_len;
> + unsigned int len = bvec.bv_len;
>
> - while (bh_offset(bh) < bvec->bv_offset)
> + while (bh_offset(bh) < bvec.bv_offset)
> bh = bh->b_this_page;
> do {
> struct buffer_head *next = bh->b_this_page;
> 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 = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> + struct bio_vec bvec;
> int copied_bytes = 0;
> int actor_offset = 0;
> + int bytes_to_copy;
>
> squashfs_actor_nobuff(actor);
> actor_addr = squashfs_first_page(actor);
>
> - if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all)))
> - return 0;
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
>
> - while (copied_bytes < req_length) {
> - int bytes_to_copy = min_t(int, bvec->bv_len - offset,
> + while (copied_bytes < req_length &&
> + iter.idx < bio->bi_vcnt) {
> + bvec = bio_iter_all_peek(bio, &iter);
> +
> + bytes_to_copy = min_t(int, bvec.bv_len,
> PAGE_SIZE - actor_offset);
>
> bytes_to_copy = 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);
>
> actor_offset += bytes_to_copy;
> copied_bytes += bytes_to_copy;
> - offset += bytes_to_copy;
>
> if (actor_offset >= PAGE_SIZE) {
> actor_addr = squashfs_next_page(actor);
> @@ -66,11 +69,8 @@ static int copy_bio_to_actor(struct bio *bio,
> break;
> actor_offset = 0;
> }
> - if (offset >= bvec->bv_len) {
> - if (!bio_next_segment(bio, &iter_all))
> - break;
> - offset = 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 index, int length,
> * Metadata block.
> */
> const u8 *data;
> - struct bvec_iter_all iter_all = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> + struct bio_vec bvec;
> +
> + bvec_iter_all_init(&iter);
>
> if (index + 2 > msblk->bytes_used) {
> res = -EIO;
> @@ -170,21 +172,25 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
> if (res)
> goto out;
>
> - if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) {
> + bvec = bio_iter_all_peek(bio, &iter);
> +
> + if (WARN_ON_ONCE(!bvec.bv_len)) {
> res = -EIO;
> goto out_free_bio;
> }
> /* Extract the length of the metadata block */
> - data = bvec_virt(bvec);
> + data = bvec_virt(&bvec);
> length = data[offset];
> - if (offset < bvec->bv_len - 1) {
> + if (offset < bvec.bv_len - 1) {
> length |= 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 = -EIO;
> goto out_free_bio;
> }
> - data = bvec_virt(bvec);
> + data = bvec_virt(&bvec);
> length |= 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 *msblk, void *strm,
> struct bio *bio, int offset, int length,
> struct squashfs_page_actor *output)
> {
> - struct bvec_iter_all iter_all = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> + struct bio_vec bvec;
> struct squashfs_lz4 *stream = strm;
> void *buff = stream->input, *data;
> int bytes = length, res;
>
> - while (bio_next_segment(bio, &iter_all)) {
> - int avail = min(bytes, ((int)bvec->bv_len) - offset);
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
>
> - data = bvec_virt(bvec);
> - memcpy(buff, data + offset, avail);
> + bio_for_each_segment_all_continue(bvec, bio, iter) {
> + unsigned avail = min_t(unsigned, bytes, bvec.bv_len);
> +
> + memcpy(buff, bvec_virt(&bvec), avail);
> buff += avail;
> bytes -= avail;
> - offset = 0;
> + if (!bytes)
> + break;
> }
>
> res = 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 *msblk, void *strm,
> struct bio *bio, int offset, int length,
> struct squashfs_page_actor *output)
> {
> - struct bvec_iter_all iter_all = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> + struct bio_vec bvec;
> struct squashfs_lzo *stream = strm;
> void *buff = stream->input, *data;
> int bytes = length, res;
> size_t out_len = output->length;
>
> - while (bio_next_segment(bio, &iter_all)) {
> - int avail = min(bytes, ((int)bvec->bv_len) - offset);
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
>
> - data = bvec_virt(bvec);
> - memcpy(buff, data + offset, avail);
> + bio_for_each_segment_all_continue(bvec, bio, iter) {
> + unsigned avail = min_t(unsigned, bytes, bvec.bv_len);
> +
> + memcpy(buff, bvec_virt(&bvec), avail);
> buff += avail;
> bytes -= avail;
> - offset = 0;
> + if (!bytes)
> + break;
> }
>
> res = 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_info *msblk, void *strm,
> struct bio *bio, int offset, int length,
> struct squashfs_page_actor *output)
> {
> - struct bvec_iter_all iter_all = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> int total = 0, error = 0;
> struct squashfs_xz *stream = strm;
>
> @@ -136,26 +135,28 @@ static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm,
> goto finish;
> }
>
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
> +
> for (;;) {
> enum xz_ret xz_err;
>
> if (stream->buf.in_pos == stream->buf.in_size) {
> - const void *data;
> - int avail;
> + struct bio_vec bvec = bio_iter_all_peek(bio, &iter);
> + unsigned avail = min_t(unsigned, length, bvec.bv_len);
>
> - if (!bio_next_segment(bio, &iter_all)) {
> + if (iter.idx >= bio->bi_vcnt) {
> /* XZ_STREAM_END must be reached. */
> error = -EIO;
> break;
> }
>
> - avail = min(length, ((int)bvec->bv_len) - offset);
> - data = bvec_virt(bvec);
> length -= avail;
> - stream->buf.in = data + offset;
> + stream->buf.in = bvec_virt(&bvec);
> stream->buf.in_size = avail;
> stream->buf.in_pos = 0;
> - offset = 0;
> +
> + bio_iter_all_advance(bio, &iter, avail);
> }
>
> if (stream->buf.out_pos == 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 = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
> int zlib_init = 0, error = 0;
> z_stream *stream = strm;
>
> @@ -67,25 +66,28 @@ static int zlib_uncompress(struct squashfs_sb_info *msblk, void *strm,
> goto finish;
> }
>
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
> +
> for (;;) {
> int zlib_err;
>
> if (stream->avail_in == 0) {
> - const void *data;
> + struct bio_vec bvec = bio_iter_all_peek(bio, &iter);
> int avail;
>
> - if (!bio_next_segment(bio, &iter_all)) {
> + if (iter.idx >= bio->bi_vcnt) {

It is bad to expose iterator/bio internal here, probably you can
return bool from bio_iter_all_peek() by moveing the check into
helper, meantime passing bvec reference to bio_iter_all_peek().

> /* Z_STREAM_END must be reached. */
> error = -EIO;
> break;
> }
>
> - avail = min(length, ((int)bvec->bv_len) - offset);
> - data = bvec_virt(bvec);
> + avail = min_t(unsigned, length, bvec.bv_len);
> length -= avail;
> - stream->next_in = data + offset;
> + stream->next_in = bvec_virt(&bvec);
> stream->avail_in = avail;
> - offset = 0;
> +
> + bio_iter_all_advance(bio, &iter, avail);
> }
>
> if (stream->avail_out == 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 = 0;
> zstd_in_buffer in_buf = { NULL, 0, 0 };
> zstd_out_buffer out_buf = { NULL, 0, 0 };
> - struct bvec_iter_all iter_all = {};
> - struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
> + struct bvec_iter_all iter;
>
> stream = zstd_init_dstream(wksp->window_size, wksp->mem, wksp->mem_size);
>
> @@ -85,25 +84,27 @@ static int zstd_uncompress(struct squashfs_sb_info *msblk, void *strm,
> goto finish;
> }
>
> + bvec_iter_all_init(&iter);
> + bio_iter_all_advance(bio, &iter, offset);
> +
> for (;;) {
> size_t zstd_err;
>
> if (in_buf.pos == in_buf.size) {
> - const void *data;
> - int avail;
> + struct bio_vec bvec = bio_iter_all_peek(bio, &iter);
> + unsigned avail = min_t(unsigned, length, bvec.bv_len);
>
> - if (!bio_next_segment(bio, &iter_all)) {
> + if (iter.idx >= bio->bi_vcnt) {

Same with above.

> error = -EIO;
> break;
> }
>
> - avail = min(length, ((int)bvec->bv_len) - offset);
> - data = bvec_virt(bvec);
> length -= avail;
> - in_buf.src = data + offset;
> + in_buf.src = bvec_virt(&bvec);
> in_buf.size = avail;
> in_buf.pos = 0;
> - offset = 0;
> +
> + bio_iter_all_advance(bio, &iter, avail);
> }
>
> if (out_buf.pos == out_buf.size) {
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 8588bcfbc6..39d8a1cc6e 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -78,22 +78,34 @@ static inline void *bio_data(struct bio *bio)
> return NULL;
> }
>
> -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 >= bio->bi_vcnt)
> - return false;
> + return bvec_iter_all_peek(bio->bi_io_vec, iter);
> +}
>
> - bvec_advance(&bio->bi_io_vec[iter->idx], iter);
> - return true;
> +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);
> }
>
> +#define bio_for_each_segment_all_continue(bvl, bio, iter) \
> + for (; \
> + iter.idx < bio->bi_vcnt && \
> + ((bvl = 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 = 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 = bio_iter_all_peek((bio), &iter)), true); \

The check of 'iter.idx < (bio)->bi_vcnt' could be moved to
bio_iter_all_peek(), meantime passing &bvl to bio_iter_all_peek().

> + bio_iter_all_advance((bio), &iter, bvl.bv_len))
>
> 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;
>
> -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 struct bio_vec *bv,
> ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
> bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
>
> -/* for iterating one bio from start to end */
> +/*
> + * bvec_iter_all: for advancing over a bio as it was originally created, but
> + * with the usual bio_for_each_segment interface - nonstandard, do not use:
> + */
> #define BVEC_ITER_ALL_INIT (struct bvec_iter) \
> { \
> .bi_sector = 0, \
> @@ -193,33 +190,45 @@ static inline void bvec_iter_advance_single(const struct bio_vec *bv,
> .bi_bvec_done = 0, \
> }
>
> -static inline struct bio_vec *bvec_init_iter_all(struct bvec_iter_all *iter_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 = 0;
> iter_all->idx = 0;
> +}
>
> - 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 = bvec[iter->idx];
> +
> + bv.bv_offset += iter->done;
> + bv.bv_len -= iter->done;
> +
> + bv.bv_page += bv.bv_offset >> PAGE_SHIFT;
> + bv.bv_offset &= ~PAGE_MASK;
> + bv.bv_len = min_t(unsigned, PAGE_SIZE - bv.bv_offset, bv.bv_len);
> +
> + return bv;
> }

Here I think compiler optimizes the last bvec copy by using external bvec
directly, and I run fio/t/io_uring and not find IOPS degrade.

As mentioned above, it can be done explicitly by passing &bvl to
bvec_iter_all_peek(), then user of bvec_iter_all_peek() can know if
one real bvec is peeked, and check of 'if (iter.idx >= bio->bi_vcnt)'
can be avoided in external callers.

Otherwise, this patch looks fine for me.

thanks,
Ming

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