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Date: Fri, 5 Aug 2016 08:09:33 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Christoph Hellwig <hch@...radead.org>,
Mike Christie <mchristi@...hat.com>
Cc: ross.zwisler@...ux.intel.com, linux-ext4@...r.kernel.org,
linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
david@...morbit.com, minchan@...nel.org, ngupta@...are.org,
vishal.l.verma@...el.com
Subject: Re: [PATCH 1/1] mm/block: convert rw_page users to bio op use
On 08/05/2016 07:52 AM, Jens Axboe wrote:
> On 08/05/2016 01:57 AM, Christoph Hellwig wrote:
>>>
>>> The rw_page users were not converted to use bio/req ops. As a result
>>> bdev_write_page is not passing down REQ_OP_WRITE and the IOs will
>>> be sent down as reads.
>>
>> Can we just get rid of REQ_OP_WRITE enum for the ->rw_page interface
>> and pass a 'bool write'? If not I'd prefer to avoid using op_is_write
>> as much as possible - it's a confusing interface if we really want
>> to do a switch on read vs write vs invalid.
>
> That's a really good point, especially since the op_flags was dropped as
> well. I'll cook that up.
How about something like this? We don't bleed into the non-core bits
anymore, so we can move those back under CONFIG_BLOCK too.
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 3439b28cce8b..0c76d4016eeb 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -300,20 +300,20 @@ 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, int op,
+ unsigned int len, unsigned int off, bool is_write,
sector_t sector)
{
void *mem;
int err = 0;
- if (op_is_write(op)) {
+ if (is_write) {
err = copy_to_brd_setup(brd, sector, len);
if (err)
goto out;
}
mem = kmap_atomic(page);
- if (!op_is_write(op)) {
+ if (!is_write) {
copy_from_brd(mem + off, brd, sector, len);
flush_dcache_page(page);
} else {
@@ -350,8 +350,8 @@ static blk_qc_t brd_make_request(struct
request_queue *q, struct bio *bio)
unsigned int len = bvec.bv_len;
int err;
- err = brd_do_bvec(brd, bvec.bv_page, len,
- bvec.bv_offset, bio_op(bio), sector);
+ err = brd_do_bvec(brd, bvec.bv_page, len, bvec.bv_offset,
+ op_is_write(bio_op(bio)), sector);
if (err)
goto io_error;
sector += len >> SECTOR_SHIFT;
@@ -366,11 +366,11 @@ io_error:
}
static int brd_rw_page(struct block_device *bdev, sector_t sector,
- struct page *page, int op)
+ struct page *page, bool is_write)
{
struct brd_device *brd = bdev->bd_disk->private_data;
- int err = brd_do_bvec(brd, page, PAGE_SIZE, 0, op, sector);
- page_endio(page, op, err);
+ int err = brd_do_bvec(brd, page, PAGE_SIZE, 0, is_write, sector);
+ page_endio(page, is_write, err);
return err;
}
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index ca29649c4b08..04365b17ee67 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -843,15 +843,16 @@ static void zram_bio_discard(struct zram *zram,
u32 index,
}
static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32
index,
- int offset, int op)
+ int offset, bool is_write)
{
unsigned long start_time = jiffies;
+ int rw_acct = is_write ? REQ_OP_WRITE : REQ_OP_READ;
int ret;
- generic_start_io_acct(op, bvec->bv_len >> SECTOR_SHIFT,
+ generic_start_io_acct(rw_acct, bvec->bv_len >> SECTOR_SHIFT,
&zram->disk->part0);
- if (!op_is_write(op)) {
+ if (!is_write) {
atomic64_inc(&zram->stats.num_reads);
ret = zram_bvec_read(zram, bvec, index, offset);
} else {
@@ -859,10 +860,10 @@ static int zram_bvec_rw(struct zram *zram, struct
bio_vec *bvec, u32 index,
ret = zram_bvec_write(zram, bvec, index, offset);
}
- generic_end_io_acct(op, &zram->disk->part0, start_time);
+ generic_end_io_acct(rw_acct, &zram->disk->part0, start_time);
if (unlikely(ret)) {
- if (!op_is_write(op))
+ if (!is_write)
atomic64_inc(&zram->stats.failed_reads);
else
atomic64_inc(&zram->stats.failed_writes);
@@ -903,17 +904,17 @@ static void __zram_make_request(struct zram *zram,
struct bio *bio)
bv.bv_offset = bvec.bv_offset;
if (zram_bvec_rw(zram, &bv, index, offset,
- bio_op(bio)) < 0)
+ op_is_write(bio_op(bio))) < 0)
goto out;
bv.bv_len = bvec.bv_len - max_transfer_size;
bv.bv_offset += max_transfer_size;
if (zram_bvec_rw(zram, &bv, index + 1, 0,
- bio_op(bio)) < 0)
+ op_is_write(bio_op(bio))) < 0)
goto out;
} else
if (zram_bvec_rw(zram, &bvec, index, offset,
- bio_op(bio)) < 0)
+ op_is_write(bio_op(bio))) < 0)
goto out;
update_position(&index, &offset, &bvec);
@@ -970,7 +971,7 @@ 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, int op)
+ struct page *page, bool is_write)
{
int offset, err = -EIO;
u32 index;
@@ -994,7 +995,7 @@ static int zram_rw_page(struct block_device *bdev,
sector_t sector,
bv.bv_len = PAGE_SIZE;
bv.bv_offset = 0;
- err = zram_bvec_rw(zram, &bv, index, offset, op);
+ err = zram_bvec_rw(zram, &bv, index, offset, is_write);
put_zram:
zram_meta_put(zram);
out:
@@ -1007,7 +1008,7 @@ out:
* (e.g., SetPageError, set_page_dirty and extra works).
*/
if (err == 0)
- page_endio(page, op, 0);
+ page_endio(page, is_write, 0);
return err;
}
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 7cf3bdfaf809..88e91666f145 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1133,11 +1133,11 @@ static int btt_write_pg(struct btt *btt, struct
bio_integrity_payload *bip,
static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip,
struct page *page, unsigned int len, unsigned int off,
- int op, sector_t sector)
+ bool is_write, sector_t sector)
{
int ret;
- if (!op_is_write(op)) {
+ if (!is_write) {
ret = btt_read_pg(btt, bip, page, off, sector, len);
flush_dcache_page(page);
} else {
@@ -1180,7 +1180,7 @@ static blk_qc_t btt_make_request(struct
request_queue *q, struct bio *bio)
BUG_ON(len % btt->sector_size);
err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset,
- bio_op(bio), iter.bi_sector);
+ op_is_write(bio_op(bio)), iter.bi_sector);
if (err) {
dev_info(&btt->nd_btt->dev,
"io error in %s sector %lld, len %d,\n",
@@ -1200,12 +1200,12 @@ out:
}
static int btt_rw_page(struct block_device *bdev, sector_t sector,
- struct page *page, int op)
+ struct page *page, bool is_write)
{
struct btt *btt = bdev->bd_disk->private_data;
- btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, op, sector);
- page_endio(page, op, 0);
+ btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
+ page_endio(page, is_write, 0);
return 0;
}
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index d64d92481c1d..20bae50c231d 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -67,7 +67,7 @@ static void pmem_clear_poison(struct pmem_device
*pmem, phys_addr_t offset,
}
static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
- unsigned int len, unsigned int off, int op,
+ unsigned int len, unsigned int off, bool is_write,
sector_t sector)
{
int rc = 0;
@@ -79,7 +79,7 @@ static int pmem_do_bvec(struct pmem_device *pmem,
struct page *page,
if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
bad_pmem = true;
- if (!op_is_write(op)) {
+ if (!is_write) {
if (unlikely(bad_pmem))
rc = -EIO;
else {
@@ -134,7 +134,7 @@ static blk_qc_t pmem_make_request(struct
request_queue *q, struct bio *bio)
do_acct = nd_iostat_start(bio, &start);
bio_for_each_segment(bvec, bio, iter) {
rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
- bvec.bv_offset, bio_op(bio),
+ bvec.bv_offset, op_is_write(bio_op(bio)),
iter.bi_sector);
if (rc) {
bio->bi_error = rc;
@@ -152,12 +152,12 @@ static blk_qc_t pmem_make_request(struct
request_queue *q, struct bio *bio)
}
static int pmem_rw_page(struct block_device *bdev, sector_t sector,
- struct page *page, int op)
+ struct page *page, bool is_write)
{
struct pmem_device *pmem = bdev->bd_queue->queuedata;
int rc;
- rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, op, sector);
+ rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, is_write, sector);
/*
* The ->rw_page interface is subtle and tricky. The core
@@ -166,7 +166,7 @@ static int pmem_rw_page(struct block_device *bdev,
sector_t sector,
* caused by double completion.
*/
if (rc == 0)
- page_endio(page, op, 0);
+ page_endio(page, is_write, 0);
return rc;
}
diff --git a/fs/block_dev.c b/fs/block_dev.c
index d402899ba135..c3cdde87cc8c 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -416,8 +416,7 @@ int bdev_read_page(struct block_device *bdev,
sector_t sector,
result = blk_queue_enter(bdev->bd_queue, false);
if (result)
return result;
- result = ops->rw_page(bdev, sector + get_start_sect(bdev), page,
- REQ_OP_READ);
+ result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false);
blk_queue_exit(bdev->bd_queue);
return result;
}
@@ -455,8 +454,7 @@ int bdev_write_page(struct block_device *bdev,
sector_t sector,
return result;
set_page_writeback(page);
- result = ops->rw_page(bdev, sector + get_start_sect(bdev), page,
- REQ_OP_WRITE);
+ result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, true);
if (result)
end_page_writeback(page);
else
diff --git a/fs/mpage.c b/fs/mpage.c
index 7a09c55b4bd0..d2413af0823a 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -50,7 +50,7 @@ static void mpage_end_io(struct bio *bio)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
- page_endio(page, bio_op(bio), bio->bi_error);
+ page_endio(page, op_is_write(bio_op(bio)), bio->bi_error);
}
bio_put(bio);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 14b28ff2caf8..f254eb264924 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -18,17 +18,6 @@ struct cgroup_subsys_state;
typedef void (bio_end_io_t) (struct bio *);
typedef void (bio_destructor_t) (struct bio *);
-enum req_op {
- REQ_OP_READ,
- REQ_OP_WRITE,
- REQ_OP_DISCARD, /* request to discard sectors */
- REQ_OP_SECURE_ERASE, /* request to securely erase sectors */
- REQ_OP_WRITE_SAME, /* write same block many times */
- REQ_OP_FLUSH, /* request for cache flush */
-};
-
-#define REQ_OP_BITS 3
-
#ifdef CONFIG_BLOCK
/*
* main unit of I/O for the block layer and lower layers (ie drivers and
@@ -239,6 +228,17 @@ enum rq_flag_bits {
#define REQ_HASHED (1ULL << __REQ_HASHED)
#define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT)
+enum req_op {
+ REQ_OP_READ,
+ REQ_OP_WRITE,
+ REQ_OP_DISCARD, /* request to discard sectors */
+ REQ_OP_SECURE_ERASE, /* request to securely erase sectors */
+ REQ_OP_WRITE_SAME, /* write same block many times */
+ REQ_OP_FLUSH, /* request for cache flush */
+};
+
+#define REQ_OP_BITS 3
+
typedef unsigned int blk_qc_t;
#define BLK_QC_T_NONE -1U
#define BLK_QC_T_SHIFT 16
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ccd68c0d01de..2c210b6a7bcf 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1672,7 +1672,7 @@ struct blk_dax_ctl {
struct block_device_operations {
int (*open) (struct block_device *, fmode_t);
void (*release) (struct gendisk *, fmode_t);
- int (*rw_page)(struct block_device *, sector_t, struct page *, int op);
+ int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned,
unsigned long);
long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 498255e6914e..f3f0b4c8e8ac 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2480,13 +2480,12 @@ extern void init_special_inode(struct inode *,
umode_t, dev_t);
extern void make_bad_inode(struct inode *);
extern bool is_bad_inode(struct inode *);
+#ifdef CONFIG_BLOCK
static inline bool op_is_write(unsigned int op)
{
return op == REQ_OP_READ ? false : true;
}
-#ifdef CONFIG_BLOCK
-
/*
* return data direction, READ or WRITE
*/
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 45786374abbd..66a1260b33de 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -510,7 +510,7 @@ static inline void wait_on_page_writeback(struct
page *page)
extern void end_page_writeback(struct page *page);
void wait_for_stable_page(struct page *page);
-void page_endio(struct page *page, int op, int err);
+void page_endio(struct page *page, bool is_write, int err);
/*
* Add an arbitrary waiter to a page's wait queue
diff --git a/mm/filemap.c b/mm/filemap.c
index daef091d4c50..8a287dfc5372 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -887,9 +887,9 @@ EXPORT_SYMBOL(end_page_writeback);
* After completing I/O on a page, call this routine to update the page
* flags appropriately
*/
-void page_endio(struct page *page, int op, int err)
+void page_endio(struct page *page, bool is_write, int err)
{
- if (!op_is_write(op)) {
+ if (!is_write) {
if (!err) {
SetPageUptodate(page);
} else {
--
Jens Axboe
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