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authorChristoph Hellwig <hch@lst.de>2020-09-24 08:51:36 +0200
committerJens Axboe <axboe@kernel.dk>2020-09-24 13:43:39 -0600
commita8b456d01cd6b37191f14248f3e2bdbe5ce3a89e (patch)
tree409f35af00eba0691be18217ce570d41751ab593 /drivers/block/zram
parented7b6b4f6e915cb0bc52d0000bcc63168867b6ac (diff)
bdi: remove BDI_CAP_SYNCHRONOUS_IO
BDI_CAP_SYNCHRONOUS_IO is only checked in the swap code, and used to decided if ->rw_page can be used on a block device. Just check up for the method instead. The only complication is that zram needs a second set of block_device_operations as it can switch between modes that actually support ->rw_page and those who don't. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/zram')
-rw-r--r--drivers/block/zram/zram_drv.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 91ccfe444525..e21ca844d7c2 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -52,6 +52,9 @@ static unsigned int num_devices = 1;
*/
static size_t huge_class_size;
+static const struct block_device_operations zram_devops;
+static const struct block_device_operations zram_wb_devops;
+
static void zram_free_page(struct zram *zram, size_t index);
static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
u32 index, int offset, struct bio *bio);
@@ -408,8 +411,7 @@ static void reset_bdev(struct zram *zram)
zram->backing_dev = NULL;
zram->old_block_size = 0;
zram->bdev = NULL;
- zram->disk->queue->backing_dev_info->capabilities |=
- BDI_CAP_SYNCHRONOUS_IO;
+ zram->disk->fops = &zram_devops;
kvfree(zram->bitmap);
zram->bitmap = NULL;
}
@@ -529,8 +531,7 @@ static ssize_t backing_dev_store(struct device *dev,
* freely but in fact, IO is going on so finally could cause
* use-after-free when the IO is really done.
*/
- zram->disk->queue->backing_dev_info->capabilities &=
- ~BDI_CAP_SYNCHRONOUS_IO;
+ zram->disk->fops = &zram_wb_devops;
up_write(&zram->init_lock);
pr_info("setup backing device %s\n", file_name);
@@ -1820,6 +1821,13 @@ static const struct block_device_operations zram_devops = {
.owner = THIS_MODULE
};
+static const struct block_device_operations zram_wb_devops = {
+ .open = zram_open,
+ .submit_bio = zram_submit_bio,
+ .swap_slot_free_notify = zram_slot_free_notify,
+ .owner = THIS_MODULE
+};
+
static DEVICE_ATTR_WO(compact);
static DEVICE_ATTR_RW(disksize);
static DEVICE_ATTR_RO(initstate);
@@ -1947,8 +1955,7 @@ static int zram_add(void)
if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE)
blk_queue_max_write_zeroes_sectors(zram->disk->queue, UINT_MAX);
- zram->disk->queue->backing_dev_info->capabilities |=
- (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO);
+ zram->disk->queue->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
device_add_disk(NULL, zram->disk, zram_disk_attr_groups);
strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));