[PATCH] block: make sure big bio is splitted into at most 256 bvecs

[Ming Lei <ming.lei@canonical.com>]

After arbitrary bio size is supported, the incoming bio may
be very big. We have to split the bio into small bios so that
each holds at most BIO_MAX_PAGES bvecs for safety reason, such
as bio_clone().

This patch fixes the following kernel crash:

> [  172.660142] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000028
> [  172.660229] IP: [<ffffffff811e53b4>] bio_trim+0xf/0x2a
> [  172.660289] PGD 7faf3e067 PUD 7f9279067 PMD 0
> [  172.660399] Oops: 0000 [#1] SMP
> [...]
> [  172.664780] Call Trace:
> [  172.664813]  [<ffffffffa007f3be>] ? raid1_make_request+0x2e8/0xad7 [raid1]
> [  172.664846]  [<ffffffff811f07da>] ? blk_queue_split+0x377/0x3d4
> [  172.664880]  [<ffffffffa005fb5f>] ? md_make_request+0xf6/0x1e9 [md_mod]
> [  172.664912]  [<ffffffff811eb860>] ? generic_make_request+0xb5/0x155
> [  172.664947]  [<ffffffffa0445c89>] ? prio_io+0x85/0x95 [bcache]
> [  172.664981]  [<ffffffffa0448252>] ? register_cache_set+0x355/0x8d0 [bcache]
> [  172.665016]  [<ffffffffa04497d3>] ? register_bcache+0x1006/0x1174 [bcache]

Fixes: 54efd50(block: make generic_make_request handle arbitrarily sized bios)
Reported-by: Sebastian Roesner <sroesner-kernelorg@roesner-online.de>
Reported-by: Eric Wheeler <bcache@lists.ewheeler.net>
Cc: stable@vger.kernel.org (4.2+)
Cc: Shaohua Li <shli@fb.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
I can reproduce the issue and verify the fix by the following approach:
	- create one raid1 over two virtio-blk 
	- build bcache device over the above raid1 and another cache device.
	- set cache mode as writeback
	- run random write over ext4 on the bcache device
	- then the crash can be triggered

 block/blk-merge.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 2613531..9a8651f 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -79,6 +79,18 @@ static inline unsigned get_max_io_size(struct request_queue *q,
 	/* aligned to logical block size */
 	sectors &= ~(mask >> 9);
 
+	/*
+	 * With arbitrary bio size, the incoming bio may be very big.
+	 * We have to split the bio into small bios so that each holds
+	 * at most BIO_MAX_PAGES bvecs for safety reason, such as
+	 * bio_clone().
+	 *
+	 * In the future, the limit might be converted into per-queue
+	 * flag.
+	 */
+	sectors = min_t(unsigned, sectors, BIO_MAX_PAGES <<
+			(PAGE_CACHE_SHIFT - 9));
+
 	return sectors;
 }
 
-- 
1.9.1