If a file system is mounted on the nbd during a disconnect, resetting
the size to 0, might change the block size and destroy the buffer_head
mappings. This will cause a infinite loop when the file system looks for
the buffer_heads for flushing.
Only set the file size to 0, if we are the only opener of the nbd.
Signed-off-by: Michael Tretter <m.tret...@pengutronix.de>
---
drivers/block/nbd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 5f2a4240a204..0d1dbb60430b 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1118,7 +1118,8 @@ static int nbd_start_device_ioctl(struct nbd_device *nbd,
struct block_device *b
if (ret)
sock_shutdown(nbd);
mutex_lock(&nbd->config_lock);
- bd_set_size(bdev, 0);
+ if (bdev->bd_openers <= 1)
+ bd_set_size(bdev, 0);
/* user requested, ignore socket errors */
if (test_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags))
ret = 0;
--
2.16.1
