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dm/core: Combine request operation type and flags 

Improve kernel code uniformity by combining the request operation type and
flags into a single variable. Change 'int rw' into 'enum req_op op' because
the name 'op' is what is used in the block layer to hold a request type.
Use the blk_opf_t and enum req_op types where appropriate to improve static
type checking.

Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-24-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2022-07-14 11:06:49 -07:00 committed by Jens Axboe
parent 71f7113d20
commit a3282b432f
3 changed files with 32 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/md/dm-bufio.c
View File

@ -577,12 +577,12 @@ static void dmio_complete(unsigned long error, void *context)
b->end_io(b, unlikely(error != 0) ? BLK_STS_IOERR : 0);
}
static void use_dmio(struct dm_buffer *b, int rw, sector_t sector,
static void use_dmio(struct dm_buffer *b, enum req_op op, sector_t sector,
unsigned n_sectors, unsigned offset)
{
int r;
struct dm_io_request io_req = {
.bi_opf = rw,
.bi_opf = op,
.notify.fn = dmio_complete,
.notify.context = b,
.client = b->c->dm_io,
@ -615,7 +615,7 @@ static void bio_complete(struct bio *bio)
b->end_io(b, status);
}
static void use_bio(struct dm_buffer *b, int rw, sector_t sector,
static void use_bio(struct dm_buffer *b, enum req_op op, sector_t sector,
unsigned n_sectors, unsigned offset)
{
struct bio *bio;
@ -629,10 +629,10 @@ static void use_bio(struct dm_buffer *b, int rw, sector_t sector,
bio = bio_kmalloc(vec_size, GFP_NOWAIT | __GFP_NORETRY | __GFP_NOWARN);
if (!bio) {
dmio:
use_dmio(b, rw, sector, n_sectors, offset);
use_dmio(b, op, sector, n_sectors, offset);
return;
}
bio_init(bio, b->c->bdev, bio->bi_inline_vecs, vec_size, rw);
bio_init(bio, b->c->bdev, bio->bi_inline_vecs, vec_size, op);
bio->bi_iter.bi_sector = sector;
bio->bi_end_io = bio_complete;
bio->bi_private = b;
@ -668,7 +668,8 @@ static inline sector_t block_to_sector(struct dm_bufio_client *c, sector_t block
return sector;
}
static void submit_io(struct dm_buffer *b, int rw, void (*end_io)(struct dm_buffer *, blk_status_t))
static void submit_io(struct dm_buffer *b, enum req_op op,
void (*end_io)(struct dm_buffer *, blk_status_t))
{
unsigned n_sectors;
sector_t sector;
@ -678,7 +679,7 @@ static void submit_io(struct dm_buffer *b, int rw, void (*end_io)(struct dm_buff
sector = block_to_sector(b->c, b->block);
if (rw != REQ_OP_WRITE) {
if (op != REQ_OP_WRITE) {
n_sectors = b->c->block_size >> SECTOR_SHIFT;
offset = 0;
} else {
@ -697,9 +698,9 @@ static void submit_io(struct dm_buffer *b, int rw, void (*end_io)(struct dm_buff
}
if (b->data_mode != DATA_MODE_VMALLOC)
use_bio(b, rw, sector, n_sectors, offset);
use_bio(b, op, sector, n_sectors, offset);
else
use_dmio(b, rw, sector, n_sectors, offset);
use_dmio(b, op, sector, n_sectors, offset);
}
/*----------------------------------------------------------------

36
drivers/md/dm-io.c
View File

@ -293,7 +293,7 @@ static void km_dp_init(struct dpages *dp, void *data)
/*-----------------------------------------------------------------
* IO routines that accept a list of pages.
*---------------------------------------------------------------*/
static void do_region(int op, int op_flags, unsigned region,
static void do_region(const blk_opf_t opf, unsigned region,
struct dm_io_region *where, struct dpages *dp,
struct io *io)
{
@ -306,6 +306,7 @@ static void do_region(int op, int op_flags, unsigned region,
struct request_queue *q = bdev_get_queue(where->bdev);
sector_t num_sectors;
unsigned int special_cmd_max_sectors;
const enum req_op op = opf & REQ_OP_MASK;
/*
* Reject unsupported discard and write same requests.
@ -339,8 +340,8 @@ static void do_region(int op, int op_flags, unsigned region,
(PAGE_SIZE >> SECTOR_SHIFT)));
}
bio = bio_alloc_bioset(where->bdev, num_bvecs, op | op_flags,
GFP_NOIO, &io->client->bios);
bio = bio_alloc_bioset(where->bdev, num_bvecs, opf, GFP_NOIO,
&io->client->bios);
bio->bi_iter.bi_sector = where->sector + (where->count - remaining);
bio->bi_end_io = endio;
store_io_and_region_in_bio(bio, io, region);
@ -368,7 +369,7 @@ static void do_region(int op, int op_flags, unsigned region,
} while (remaining);
}
static void dispatch_io(int op, int op_flags, unsigned int num_regions,
static void dispatch_io(blk_opf_t opf, unsigned int num_regions,
struct dm_io_region *where, struct dpages *dp,
struct io *io, int sync)
{
@ -378,7 +379,7 @@ static void dispatch_io(int op, int op_flags, unsigned int num_regions,
BUG_ON(num_regions > DM_IO_MAX_REGIONS);
if (sync)
op_flags |= REQ_SYNC;
opf |= REQ_SYNC;
/*
* For multiple regions we need to be careful to rewind
@ -386,8 +387,8 @@ static void dispatch_io(int op, int op_flags, unsigned int num_regions,
*/
for (i = 0; i < num_regions; i++) {
*dp = old_pages;
if (where[i].count || (op_flags & REQ_PREFLUSH))
do_region(op, op_flags, i, where + i, dp, io);
if (where[i].count || (opf & REQ_PREFLUSH))
do_region(opf, i, where + i, dp, io);
}
/*
@ -411,13 +412,13 @@ static void sync_io_complete(unsigned long error, void *context)
}
static int sync_io(struct dm_io_client *client, unsigned int num_regions,
struct dm_io_region *where, int op, int op_flags,
struct dpages *dp, unsigned long *error_bits)
struct dm_io_region *where, blk_opf_t opf, struct dpages *dp,
unsigned long *error_bits)
{
struct io *io;
struct sync_io sio;
if (num_regions > 1 && !op_is_write(op)) {
if (num_regions > 1 && !op_is_write(opf)) {
WARN_ON(1);
return -EIO;
}
@ -434,7 +435,7 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
io->vma_invalidate_address = dp->vma_invalidate_address;
io->vma_invalidate_size = dp->vma_invalidate_size;
dispatch_io(op, op_flags, num_regions, where, dp, io, 1);
dispatch_io(opf, num_regions, where, dp, io, 1);
wait_for_completion_io(&sio.wait);
@ -445,12 +446,12 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
}
static int async_io(struct dm_io_client *client, unsigned int num_regions,
struct dm_io_region *where, int op, int op_flags,
struct dm_io_region *where, blk_opf_t opf,
struct dpages *dp, io_notify_fn fn, void *context)
{
struct io *io;
if (num_regions > 1 && !op_is_write(op)) {
if (num_regions > 1 && !op_is_write(opf)) {
WARN_ON(1);
fn(1, context);
return -EIO;
@ -466,7 +467,7 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
io->vma_invalidate_address = dp->vma_invalidate_address;
io->vma_invalidate_size = dp->vma_invalidate_size;
dispatch_io(op, op_flags, num_regions, where, dp, io, 0);
dispatch_io(opf, num_regions, where, dp, io, 0);
return 0;
}
@ -519,13 +520,10 @@ int dm_io(struct dm_io_request *io_req, unsigned num_regions,
if (!io_req->notify.fn)
return sync_io(io_req->client, num_regions, where,
io_req->bi_opf & REQ_OP_MASK,
io_req->bi_opf & ~REQ_OP_MASK, &dp,
sync_error_bits);
io_req->bi_opf, &dp, sync_error_bits);
return async_io(io_req->client, num_regions, where,
io_req->bi_opf & REQ_OP_MASK,
io_req->bi_opf & ~REQ_OP_MASK, &dp, io_req->notify.fn,
io_req->bi_opf, &dp, io_req->notify.fn,
io_req->notify.context);
}
EXPORT_SYMBOL(dm_io);

10
drivers/md/dm.c
View File

@ -716,7 +716,7 @@ static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
}
static inline struct dm_table *dm_get_live_table_bio(struct mapped_device *md,
int *srcu_idx, unsigned bio_opf)
int *srcu_idx, blk_opf_t bio_opf)
{
if (bio_opf & REQ_NOWAIT)
return dm_get_live_table_fast(md);
@ -725,7 +725,7 @@ static inline struct dm_table *dm_get_live_table_bio(struct mapped_device *md,
}
static inline void dm_put_live_table_bio(struct mapped_device *md, int srcu_idx,
unsigned bio_opf)
blk_opf_t bio_opf)
{
if (bio_opf & REQ_NOWAIT)
dm_put_live_table_fast(md);
@ -1511,7 +1511,7 @@ static void __send_changing_extent_only(struct clone_info *ci, struct dm_target
static bool is_abnormal_io(struct bio *bio)
{
unsigned int op = bio_op(bio);
enum req_op op = bio_op(bio);
if (op != REQ_OP_READ && op != REQ_OP_WRITE && op != REQ_OP_FLUSH) {
switch (op) {
@ -1625,7 +1625,7 @@ static blk_status_t __split_and_process_bio(struct clone_info *ci)
* Only support bio polling for normal IO, and the target io is
* exactly inside the dm_io instance (verified in dm_poll_dm_io)
*/
ci->submit_as_polled = ci->bio->bi_opf & REQ_POLLED;
ci->submit_as_polled = !!(ci->bio->bi_opf & REQ_POLLED);
len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count);
setup_split_accounting(ci, len);
@ -1722,7 +1722,7 @@ static void dm_submit_bio(struct bio *bio)
struct mapped_device *md = bio->bi_bdev->bd_disk->private_data;
int srcu_idx;
struct dm_table *map;
unsigned bio_opf = bio->bi_opf;
blk_opf_t bio_opf = bio->bi_opf;
map = dm_get_live_table_bio(md, &srcu_idx, bio_opf);