Unverified Commit be914f8f authored by Christian Brauner's avatar Christian Brauner
Browse files

zram: port block device access to file 

Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-12-adbd023e19cc@kernel.org


Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 217759bb

drivers/block/zram/zram_drv.c

+13 −13
Original line number Diff line number Diff line
@@ -426,11 +426,11 @@ static void reset_bdev(struct zram *zram) 
	if (!zram->backing_dev)

		return;



	bdev_release(zram->bdev_handle);

	fput(zram->bdev_file);

	/* hope filp_close flush all of IO */

	filp_close(zram->backing_dev, NULL);

	zram->backing_dev = NULL;

	zram->bdev_handle = NULL;

	zram->bdev_file = NULL;

	zram->disk->fops = &zram_devops;

	kvfree(zram->bitmap);

	zram->bitmap = NULL;
@@ -476,7 +476,7 @@ static ssize_t backing_dev_store(struct device *dev, 
	struct address_space *mapping;

	unsigned int bitmap_sz;

	unsigned long nr_pages, *bitmap = NULL;

	struct bdev_handle *bdev_handle = NULL;

	struct file *bdev_file = NULL;

	int err;

	struct zram *zram = dev_to_zram(dev);
@@ -513,11 +513,11 @@ static ssize_t backing_dev_store(struct device *dev, 
		goto out;

	}



	bdev_handle = bdev_open_by_dev(inode->i_rdev,

	bdev_file = bdev_file_open_by_dev(inode->i_rdev,

				BLK_OPEN_READ | BLK_OPEN_WRITE, zram, NULL);

	if (IS_ERR(bdev_handle)) {

		err = PTR_ERR(bdev_handle);

		bdev_handle = NULL;

	if (IS_ERR(bdev_file)) {

		err = PTR_ERR(bdev_file);

		bdev_file = NULL;

		goto out;

	}
@@ -531,7 +531,7 @@ static ssize_t backing_dev_store(struct device *dev, 


	reset_bdev(zram);



	zram->bdev_handle = bdev_handle;

	zram->bdev_file = bdev_file;

	zram->backing_dev = backing_dev;

	zram->bitmap = bitmap;

	zram->nr_pages = nr_pages;
@@ -544,8 +544,8 @@ static ssize_t backing_dev_store(struct device *dev, 
out:

	kvfree(bitmap);



	if (bdev_handle)

		bdev_release(bdev_handle);

	if (bdev_file)

		fput(bdev_file);



	if (backing_dev)

		filp_close(backing_dev, NULL);
@@ -587,7 +587,7 @@ static void read_from_bdev_async(struct zram *zram, struct page *page, 
{

	struct bio *bio;



	bio = bio_alloc(zram->bdev_handle->bdev, 1, parent->bi_opf, GFP_NOIO);

	bio = bio_alloc(file_bdev(zram->bdev_file), 1, parent->bi_opf, GFP_NOIO);

	bio->bi_iter.bi_sector = entry * (PAGE_SIZE >> 9);

	__bio_add_page(bio, page, PAGE_SIZE, 0);

	bio_chain(bio, parent);
@@ -703,7 +703,7 @@ static ssize_t writeback_store(struct device *dev, 
			continue;

		}



		bio_init(&bio, zram->bdev_handle->bdev, &bio_vec, 1,

		bio_init(&bio, file_bdev(zram->bdev_file), &bio_vec, 1,

			 REQ_OP_WRITE | REQ_SYNC);

		bio.bi_iter.bi_sector = blk_idx * (PAGE_SIZE >> 9);

		__bio_add_page(&bio, page, PAGE_SIZE, 0);
@@ -785,7 +785,7 @@ static void zram_sync_read(struct work_struct *work) 
	struct bio_vec bv;

	struct bio bio;



	bio_init(&bio, zw->zram->bdev_handle->bdev, &bv, 1, REQ_OP_READ);

	bio_init(&bio, file_bdev(zw->zram->bdev_file), &bv, 1, REQ_OP_READ);

	bio.bi_iter.bi_sector = zw->entry * (PAGE_SIZE >> 9);

	__bio_add_page(&bio, zw->page, PAGE_SIZE, 0);

	zw->error = submit_bio_wait(&bio);

drivers/block/zram/zram_drv.h

+1 −1
Original line number Diff line number Diff line
@@ -132,7 +132,7 @@ struct zram { 
	spinlock_t wb_limit_lock;

	bool wb_limit_enable;

	u64 bd_wb_limit;

	struct bdev_handle *bdev_handle;

	struct file *bdev_file;

	unsigned long *bitmap;

	unsigned long nr_pages;

#endif