linux-kernel - [PATCH 5.7 090/265] loop: replace kill_bdev with invalidate

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Message-Id: <20200629151818.2493727-91-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:15:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zheng Bin <zhengbin13@...wei.com>, Christoph Hellwig <hch@....de>,
        Bart Van Assche <bvanassche@....org>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 5.7 090/265] loop: replace kill_bdev with invalidate_bdev

From: Zheng Bin <zhengbin13@...wei.com>

[ Upstream commit f4bd34b139a3fa2808c4205f12714c65e1548c6c ]

When a filesystem is mounted on a loop device and on a loop ioctl
LOOP_SET_STATUS64, because of kill_bdev, buffer_head mappings are getting
destroyed.
kill_bdev
  truncate_inode_pages
    truncate_inode_pages_range
      do_invalidatepage
        block_invalidatepage
          discard_buffer  -->clear BH_Mapped flag

sb_bread
  __bread_gfp
  bh = __getblk_gfp
  -->discard_buffer clear BH_Mapped flag
  __bread_slow
    submit_bh
      submit_bh_wbc
        BUG_ON(!buffer_mapped(bh))  --> hit this BUG_ON

Fixes: 5db470e229e2 ("loop: drop caches if offset or block_size are changed")
Signed-off-by: Zheng Bin <zhengbin13@...wei.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/block/loop.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index da693e6a834e5..418bb4621255a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1289,7 +1289,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 	if (lo->lo_offset != info->lo_offset ||
 	    lo->lo_sizelimit != info->lo_sizelimit) {
 		sync_blockdev(lo->lo_device);
-		kill_bdev(lo->lo_device);
+		invalidate_bdev(lo->lo_device);
 	}
 
 	/* I/O need to be drained during transfer transition */
@@ -1320,7 +1320,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 
 	if (lo->lo_offset != info->lo_offset ||
 	    lo->lo_sizelimit != info->lo_sizelimit) {
-		/* kill_bdev should have truncated all the pages */
+		/* invalidate_bdev should have truncated all the pages */
 		if (lo->lo_device->bd_inode->i_mapping->nrpages) {
 			err = -EAGAIN;
 			pr_warn("%s: loop%d (%s) has still dirty pages (nrpages=%lu)\n",
@@ -1565,11 +1565,11 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
 		return 0;
 
 	sync_blockdev(lo->lo_device);
-	kill_bdev(lo->lo_device);
+	invalidate_bdev(lo->lo_device);
 
 	blk_mq_freeze_queue(lo->lo_queue);
 
-	/* kill_bdev should have truncated all the pages */
+	/* invalidate_bdev should have truncated all the pages */
 	if (lo->lo_device->bd_inode->i_mapping->nrpages) {
 		err = -EAGAIN;
 		pr_warn("%s: loop%d (%s) has still dirty pages (nrpages=%lu)\n",
-- 
2.25.1