[PATCH v8 05/19] block, fs: Restore the per-bio/request data lifetime fields

Bart Van Assche
2023-12-19T00:08:40Z

Restore support for passing data lifetime information from filesystems to
block drivers. This patch reverts commit b179c98f7697 ("block: Remove
request.write_hint") and commit c75e707fe1aa ("block: remove the
per-bio/request write hint").

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
block/bio.c | 2 ++
block/blk-crypto-fallback.c | 1 +
block/blk-merge.c | 8 ++++++++
block/blk-mq.c | 2 ++
block/bounce.c | 1 +
block/fops.c | 3 +++
fs/buffer.c | 12 ++++++++----
fs/direct-io.c | 2 ++
fs/iomap/buffered-io.c | 2 ++
fs/iomap/direct-io.c | 1 +
fs/mpage.c | 1 +
include/linux/blk-mq.h | 2 ++
include/linux/blk_types.h | 2 ++
13 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 816d412c06e9..755fcde5cb66 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -251,6 +251,7 @@ void bio_init(struct bio *bio, struct block_device *bdev, struct bio_vec *table,
bio->bi_opf = opf;
bio->bi_flags = 0;
bio->bi_ioprio = 0;
+ bio->bi_write_hint = 0;
bio->bi_status = 0;
bio->bi_iter.bi_sector = 0;
bio->bi_iter.bi_size = 0;
@@ -813,6 +814,7 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp)
{
bio_set_flag(bio, BIO_CLONED);
bio->bi_ioprio = bio_src->bi_ioprio;
+ bio->bi_write_hint = bio_src->bi_write_hint;
bio->bi_iter = bio_src->bi_iter;

if (bio->bi_bdev) {
diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c
index e6468eab2681..b1e7415f8439 100644
--- a/block/blk-crypto-fallback.c
+++ b/block/blk-crypto-fallback.c
@@ -172,6 +172,7 @@ static struct bio *blk_crypto_fallback_clone_bio(struct bio *bio_src)
if (bio_flagged(bio_src, BIO_REMAPPED))
bio_set_flag(bio, BIO_REMAPPED);
bio->bi_ioprio = bio_src->bi_ioprio;
+ bio->bi_write_hint = bio_src->bi_write_hint;
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 65e75efa9bd3..65bbbf6cf1fe 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -814,6 +814,10 @@ static struct request *attempt_merge(struct request_queue *q,
if (rq_data_dir(req) != rq_data_dir(next))
return NULL;

+ /* Don't merge requests with different write hints. */
+ if (req->write_hint != next->write_hint)
+ return NULL;
+
if (req->ioprio != next->ioprio)
return NULL;

@@ -941,6 +945,10 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
if (!bio_crypt_rq_ctx_compatible(rq, bio))
return false;

+ /* Don't merge requests with different write hints. */
+ if (rq->write_hint != bio->bi_write_hint)
+ return false;
+
if (rq->ioprio != bio_prio(bio))
return false;

diff --git a/block/blk-mq.c b/block/blk-mq.c
index e2d11183f62e..081df9faf499 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2551,6 +2551,7 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
rq->cmd_flags |= REQ_FAILFAST_MASK;

rq->__sector = bio->bi_iter.bi_sector;
+ rq->write_hint = bio->bi_write_hint;
blk_rq_bio_prep(rq, bio, nr_segs);

/* This can't fail, since GFP_NOIO includes __GFP_DIRECT_RECLAIM. */
@@ -3143,6 +3144,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
}
rq->nr_phys_segments = rq_src->nr_phys_segments;
rq->ioprio = rq_src->ioprio;
+ rq->write_hint = rq_src->write_hint;

if (rq->bio && blk_crypto_rq_bio_prep(rq, rq->bio, gfp_mask) < 0)
goto free_and_out;
diff --git a/block/bounce.c b/block/bounce.c
index 7cfcb242f9a1..d6a5219f29dd 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -169,6 +169,7 @@ static struct bio *bounce_clone_bio(struct bio *bio_src)
if (bio_flagged(bio_src, BIO_REMAPPED))
bio_set_flag(bio, BIO_REMAPPED);
bio->bi_ioprio = bio_src->bi_ioprio;
+ bio->bi_write_hint = bio_src->bi_write_hint;
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;

diff --git a/block/fops.c b/block/fops.c
index 0abaac705daf..787ce52bc2c6 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -73,6 +73,7 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
bio_init(&bio, bdev, vecs, nr_pages, dio_bio_write_op(iocb));
}
bio.bi_iter.bi_sector = pos >> SECTOR_SHIFT;
+ bio.bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
bio.bi_ioprio = iocb->ki_ioprio;

ret = bio_iov_iter_get_pages(&bio, iter);
@@ -203,6 +204,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,

for (;;) {
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
+ bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
bio->bi_private = dio;
bio->bi_end_io = blkdev_bio_end_io;
bio->bi_ioprio = iocb->ki_ioprio;
@@ -321,6 +323,7 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
dio->flags = 0;
dio->iocb = iocb;
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
+ bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
bio->bi_end_io = blkdev_bio_end_io_async;
bio->bi_ioprio = iocb->ki_ioprio;

diff --git a/fs/buffer.c b/fs/buffer.c
index 967f34b70aa8..76834398e713 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -55,7 +55,7 @@

static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,
- struct writeback_control *wbc);
+ enum rw_hint hint, struct writeback_control *wbc);

#define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)

@@ -1903,7 +1903,8 @@ int __block_write_full_folio(struct inode *inode, struct folio *folio,
do {
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
- submit_bh_wbc(REQ_OP_WRITE | write_flags, bh, wbc);
+ submit_bh_wbc(REQ_OP_WRITE | write_flags, bh,
+ inode->i_write_hint, wbc);
nr_underway++;
}
bh = next;
@@ -1957,7 +1958,8 @@ int __block_write_full_folio(struct inode *inode, struct folio *folio,
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
clear_buffer_dirty(bh);
- submit_bh_wbc(REQ_OP_WRITE | write_flags, bh, wbc);
+ submit_bh_wbc(REQ_OP_WRITE | write_flags, bh,
+ inode->i_write_hint, wbc);
nr_underway++;
}
bh = next;
@@ -2777,6 +2779,7 @@ static void end_bio_bh_io_sync(struct bio *bio)
}

static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,
+ enum rw_hint write_hint,
struct writeback_control *wbc)
{
const enum req_op op = opf & REQ_OP_MASK;
@@ -2804,6 +2807,7 @@ static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,
fscrypt_set_bio_crypt_ctx_bh(bio, bh, GFP_NOIO);

bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
+ bio->bi_write_hint = write_hint;

__bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));

@@ -2823,7 +2827,7 @@ static void submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,

void submit_bh(blk_opf_t opf, struct buffer_head *bh)
{
- submit_bh_wbc(opf, bh, NULL);
+ submit_bh_wbc(opf, bh, WRITE_LIFE_NOT_SET, NULL);
}
EXPORT_SYMBOL(submit_bh);

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 20533266ade6..5261ab8bcdaa 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -410,6 +410,8 @@ dio_bio_alloc(struct dio *dio, struct dio_submit *sdio,
bio->bi_end_io = dio_bio_end_io;
if (dio->is_pinned)
bio_set_flag(bio, BIO_PAGE_PINNED);
+ bio->bi_write_hint = file_inode(dio->iocb->ki_filp)->i_write_hint;
+
sdio->bio = bio;
sdio->logical_offset_in_bio = sdio->cur_page_fs_offset;
}
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index f72df2babe56..191eb575485e 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1677,6 +1677,7 @@ iomap_alloc_ioend(struct inode *inode, struct iomap_writepage_ctx *wpc,
REQ_OP_WRITE | wbc_to_write_flags(wbc),
GFP_NOFS, &iomap_ioend_bioset);
bio->bi_iter.bi_sector = sector;
+ bio->bi_write_hint = inode->i_write_hint;
wbc_init_bio(wbc, bio);

ioend = container_of(bio, struct iomap_ioend, io_inline_bio);
@@ -1707,6 +1708,7 @@ iomap_chain_bio(struct bio *prev)
new = bio_alloc(prev->bi_bdev, BIO_MAX_VECS, prev->bi_opf, GFP_NOFS);
bio_clone_blkg_association(new, prev);
new->bi_iter.bi_sector = bio_end_sector(prev);
+ new->bi_write_hint = prev->bi_write_hint;

bio_chain(prev, new);
bio_get(prev); /* for iomap_finish_ioend */
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index bcd3f8cf5ea4..f3b43d223a46 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -380,6 +380,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
GFP_KERNEL);
bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
+ bio->bi_write_hint = inode->i_write_hint;
bio->bi_ioprio = dio->iocb->ki_ioprio;
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
diff --git a/fs/mpage.c b/fs/mpage.c
index ffb064ed9d04..268785f2bb53 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -611,6 +611,7 @@ static int __mpage_writepage(struct folio *folio, struct writeback_control *wbc,
GFP_NOFS);
bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
wbc_init_bio(wbc, bio);
+ bio->bi_write_hint = inode->i_write_hint;
}

/*
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 1ab3081c82ed..479f26af76bd 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -8,6 +8,7 @@
#include <linux/scatterlist.h>
#include <linux/prefetch.h>
#include <linux/srcu.h>
+#include <linux/rw_hint.h>

struct blk_mq_tags;
struct blk_flush_queue;
@@ -135,6 +136,7 @@ struct request {
struct blk_crypto_keyslot *crypt_keyslot;
#endif

+ enum rw_hint write_hint;
unsigned short ioprio;

enum mq_rq_state state;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d5c5e59ddbd2..8410957f4313 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -10,6 +10,7 @@
#include <linux/bvec.h>
#include <linux/device.h>
#include <linux/ktime.h>
+#include <linux/rw_hint.h>

struct bio_set;
struct bio;
@@ -269,6 +270,7 @@ struct bio {
*/
unsigned short bi_flags; /* BIO_* below */
unsigned short bi_ioprio;
+ enum rw_hint bi_write_hint;
blk_status_t bi_status;
atomic_t __bi_remaining;