From 74d46992e0d9dee7f1f376de0d56d31614c8a17a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 23 Aug 2017 19:10:32 +0200 Subject: block: replace bi_bdev with a gendisk pointer and partitions index This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- fs/ext4/page-io.c | 4 ++-- fs/ext4/readpage.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'fs/ext4') diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index c2fce4478cca..55ad7dd149d0 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -300,7 +300,7 @@ static void ext4_end_bio(struct bio *bio) char b[BDEVNAME_SIZE]; if (WARN_ONCE(!io_end, "io_end is NULL: %s: sector %Lu len %u err %d\n", - bdevname(bio->bi_bdev, b), + bio_devname(bio, b), (long long) bio->bi_iter.bi_sector, (unsigned) bio_sectors(bio), bio->bi_status)) { @@ -375,7 +375,7 @@ static int io_submit_init_bio(struct ext4_io_submit *io, return -ENOMEM; wbc_init_bio(io->io_wbc, bio); bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); - bio->bi_bdev = bh->b_bdev; + bio_set_dev(bio, bh->b_bdev); bio->bi_end_io = ext4_end_bio; bio->bi_private = ext4_get_io_end(io->io_end); io->io_bio = bio; diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c index 40a5497b0f60..04c90643af7a 100644 --- a/fs/ext4/readpage.c +++ b/fs/ext4/readpage.c @@ -254,7 +254,7 @@ int ext4_mpage_readpages(struct address_space *mapping, fscrypt_release_ctx(ctx); goto set_error_page; } - bio->bi_bdev = bdev; + bio_set_dev(bio, bdev); bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9); bio->bi_end_io = mpage_end_io; bio->bi_private = ctx; -- cgit v1.2.3