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Subject[RFC PATCH 1/1] nbd: replace kill_bdev() with __invalidate_device()
Date
From: Ratna Manoj Bolla <manoj.br@gmail.com>

When a filesystem is mounted on a nbd device and on a disconnect, because
of kill_bdev(), and resetting bdev size to zero, buffer_head mappings are
getting destroyed under mounted filesystem.

After a bdev size reset(i.e bdev->bd_inode->i_size = 0) on a disconnect,
followed by a sys_umount(),
generic_shutdown_super()->...
->__sync_blockdev()->...
-blkdev_writepages()->...
->do_invalidatepage()->...
-discard_buffer() is discarding superblock buffer_head assumed
to be in mapped state by ext4_commit_super().

[mlin: ported to 4.11-rc2]
Signed-off-by: Ratna Manoj Bolla <manoj.br@gmail.com
---
drivers/block/nbd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index cb4ccfc..a6a3643 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -125,7 +125,8 @@ static const char *nbdcmd_to_ascii(int cmd)

static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev)
{
- bd_set_size(bdev, 0);
+ if (bdev->bd_openers <= 1)
+ bd_set_size(bdev, 0);
set_capacity(nbd->disk, 0);
kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);

@@ -603,6 +604,8 @@ static void nbd_reset(struct nbd_device *nbd)

static void nbd_bdev_reset(struct block_device *bdev)
{
+ if (bdev->bd_openers > 1)
+ return;
set_device_ro(bdev, false);
bdev->bd_inode->i_size = 0;
if (max_part > 0) {
@@ -666,7 +669,8 @@ static int nbd_clear_sock(struct nbd_device *nbd, struct block_device *bdev)
{
sock_shutdown(nbd);
nbd_clear_que(nbd);
- kill_bdev(bdev);
+
+ __invalidate_device(bdev, true);
nbd_bdev_reset(bdev);
/*
* We want to give the run thread a chance to wait for everybody
--
1.8.3.1
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