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block: make bdev_ops->rw_page() take a REQ_OP instead of bool

Browse source 
c11f0c0b5b ("block/mm: make bdev_ops->rw_page() take a bool for
read/write") replaced @op with boolean @is_write, which limited the
amount of information going into ->rw_page() and more importantly
page_endio(), which removed the need to expose block internals to mm.

Unfortunately, we want to track discards separately and @is_write
isn't enough information.  This patch updates bdev_ops->rw_page() to
take REQ_OP instead but leaves page_endio() to take bool @is_write.
This allows the block part of operations to have enough information
while not leaking it to mm.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Dan Williams <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2018-07-18 04:47:36 -07:00 • committed by Jens Axboe
commit 3f289dcb4b
7 changed files with 34 additions and 33 deletions
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14
drivers/block/brd.c
View file

@ -254,20 +254,20 @@ static void copy_from_brd(void *dst, struct brd_device *brd,
* Process a single bvec of a bio.
*/
static int brd_do_bvec(struct brd_device *brd, struct page *page,
unsigned int len, unsigned int off, bool is_write,
unsigned int len, unsigned int off, unsigned int op,
sector_t sector)
{
void *mem;
int err = 0;
if (is_write) {
if (op_is_write(op)) {
err = copy_to_brd_setup(brd, sector, len);
if (err)
goto out;
}
mem = kmap_atomic(page);
if (!is_write) {
if (!op_is_write(op)) {
copy_from_brd(mem + off, brd, sector, len);
flush_dcache_page(page);
} else {
@ -296,7 +296,7 @@ static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
int err;
err = brd_do_bvec(brd, bvec.bv_page, len, bvec.bv_offset,
op_is_write(bio_op(bio)), sector);
bio_op(bio), sector);
if (err)
goto io_error;
sector += len >> SECTOR_SHIFT;
@ -310,15 +310,15 @@ io_error:
}
static int brd_rw_page(struct block_device *bdev, sector_t sector,
struct page *page, bool is_write)
struct page *page, unsigned int op)
{
struct brd_device *brd = bdev->bd_disk->private_data;
int err;
if (PageTransHuge(page))
return -ENOTSUPP;
err = brd_do_bvec(brd, page, PAGE_SIZE, 0, is_write, sector);
page_endio(page, is_write, err);
err = brd_do_bvec(brd, page, PAGE_SIZE, 0, op, sector);
page_endio(page, op_is_write(op), err);
return err;
}

16
drivers/block/zram/zram_drv.c
View file

@ -1274,17 +1274,17 @@ static void zram_bio_discard(struct zram *zram, u32 index,
* Returns 1 if IO request was successfully submitted.
*/
static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
int offset, bool is_write, struct bio *bio)
int offset, unsigned int op, struct bio *bio)
{
unsigned long start_time = jiffies;
int rw_acct = is_write ? REQ_OP_WRITE : REQ_OP_READ;
int rw_acct = op_is_write(op) ? REQ_OP_WRITE : REQ_OP_READ;
struct request_queue *q = zram->disk->queue;
int ret;
generic_start_io_acct(q, rw_acct, bvec->bv_len >> SECTOR_SHIFT,
&zram->disk->part0);
if (!is_write) {
if (!op_is_write(op)) {
atomic64_inc(&zram->stats.num_reads);
ret = zram_bvec_read(zram, bvec, index, offset, bio);
flush_dcache_page(bvec->bv_page);
@ -1300,7 +1300,7 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
zram_slot_unlock(zram, index);
if (unlikely(ret < 0)) {
if (!is_write)
if (!op_is_write(op))
atomic64_inc(&zram->stats.failed_reads);
else
atomic64_inc(&zram->stats.failed_writes);
@ -1338,7 +1338,7 @@ static void __zram_make_request(struct zram *zram, struct bio *bio)
bv.bv_len = min_t(unsigned int, PAGE_SIZE - offset,
unwritten);
if (zram_bvec_rw(zram, &bv, index, offset,
op_is_write(bio_op(bio)), bio) < 0)
bio_op(bio), bio) < 0)
goto out;
bv.bv_offset += bv.bv_len;
@ -1390,7 +1390,7 @@ static void zram_slot_free_notify(struct block_device *bdev,
}
static int zram_rw_page(struct block_device *bdev, sector_t sector,
struct page *page, bool is_write)
struct page *page, unsigned int op)
{
int offset, ret;
u32 index;
@ -1414,7 +1414,7 @@ static int zram_rw_page(struct block_device *bdev, sector_t sector,
bv.bv_len = PAGE_SIZE;
bv.bv_offset = 0;
ret = zram_bvec_rw(zram, &bv, index, offset, is_write, NULL);
ret = zram_bvec_rw(zram, &bv, index, offset, op, NULL);
out:
/*
* If I/O fails, just return error(ie, non-zero) without
@ -1429,7 +1429,7 @@ out:
switch (ret) {
case 0:
page_endio(page, is_write, 0);
page_endio(page, op_is_write(op), 0);
break;
case 1:
ret = 0;