linux-kernel - Re: [RFC PATCH 1/1] nbd: replace kill_bdev() with __invalidate

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Message-ID: <8AA3DAC1-5E9C-438E-904B-D4C708A4F624@fb.com>
Date:   Thu, 23 Mar 2017 17:51:07 +0000
From:   Josef Bacik <jbacik@...com>
To:     Ming Lin <mlin@...nel.org>,
        "nbd-general@...ts.sourceforge.net" 
        <nbd-general@...ts.sourceforge.net>,
        Ratna Manoj Bolla <manoj.br@...il.com>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jianshu.ljs@...baba-inc.com" <jianshu.ljs@...baba-inc.com>,
        "xiongwei.jiang@...baba-inc.com" <xiongwei.jiang@...baba-inc.com>,
        "james.liu@...baba-inc.com" <james.liu@...baba-inc.com>
Subject: Re: [RFC PATCH 1/1] nbd: replace kill_bdev() with
 __invalidate_device()

Yeah I think this is ok, I’ll throw it on my queue for fixes for this cycle.  Thanks,

Josef

On 3/20/17, 6:58 PM, "Ming Lin" <mlin@...nel.org> wrote:

From: Ratna Manoj Bolla <manoj.br@...il.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@...il.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