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nbd: don't update block size after device is started 

Mounted NBD device can be resized, one use case is rbd-nbd.

Fix the issue by setting up default block size, then not touch it
in nbd_size_update() any more. This kind of usage is aligned with loop
which has same use case too.

Cc: stable@vger.kernel.org
Fixes: c8a83a6b54 ("nbd: Use set_blocksize() to set device blocksize")
Reported-by: lining <lining2020x@163.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Jan Kara <jack@suse.cz>
Tested-by: lining <lining2020x@163.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
zero-sugar-mainline-defconfig
Ming Lei 2020-10-28 15:24:34 +08:00 committed by Jens Axboe
parent 4977d121bc
commit b40813ddcd
1 changed files with 5 additions and 4 deletions
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9
drivers/block/nbd.c
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@ -296,7 +296,7 @@ static void nbd_size_clear(struct nbd_device *nbd)
}
}
static void nbd_size_update(struct nbd_device *nbd)
static void nbd_size_update(struct nbd_device *nbd, bool start)
{
struct nbd_config *config = nbd->config;
struct block_device *bdev = bdget_disk(nbd->disk, 0);
@ -313,7 +313,8 @@ static void nbd_size_update(struct nbd_device *nbd)
if (bdev) {
if (bdev->bd_disk) {
bd_set_nr_sectors(bdev, nr_sectors);
set_blocksize(bdev, config->blksize);
if (start)
set_blocksize(bdev, config->blksize);
} else
set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
bdput(bdev);
@ -328,7 +329,7 @@ static void nbd_size_set(struct nbd_device *nbd, loff_t blocksize,
config->blksize = blocksize;
config->bytesize = blocksize * nr_blocks;
if (nbd->task_recv != NULL)
nbd_size_update(nbd);
nbd_size_update(nbd, false);
}
static void nbd_complete_rq(struct request *req)
@ -1308,7 +1309,7 @@ static int nbd_start_device(struct nbd_device *nbd)
args->index = i;
queue_work(nbd->recv_workq, &args->work);
}
nbd_size_update(nbd);
nbd_size_update(nbd, true);
return error;
}