From: Ming Lei <ming.lei@xxxxxxxxxx>
[ Upstream commit b40813ddcd6bf9f01d020804e4cb8febc480b9e4 ]
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@xxxxxxxxxxxxxxx
Fixes: c8a83a6b54d0 ("nbd: Use set_blocksize() to set device blocksize")
Reported-by: lining <lining2020x@xxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Tested-by: lining <lining2020x@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/block/nbd.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 742f8160b6e28..62a873718b5bb 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -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);
@@ -312,7 +312,8 @@ static void nbd_size_update(struct nbd_device *nbd)
if (bdev) {
if (bdev->bd_disk) {
bd_set_size(bdev, config->bytesize);
- set_blocksize(bdev, config->blksize);
+ if (start)
+ set_blocksize(bdev, config->blksize);
} else
bdev->bd_invalidated = 1;
bdput(bdev);
@@ -327,7 +328,7 @@ 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)
@@ -1293,7 +1294,7 @@ 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;
}
--
2.27.0
