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block: Fix cloning of requests with a special payload
commit297ba57dcd
upstream. This patch avoids that removing a path controlled by the dm-mpath driver while mkfs is running triggers the following kernel bug: kernel BUG at block/blk-core.c:3347! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 20 PID: 24369 Comm: mkfs.ext4 Not tainted 4.18.0-rc1-dbg+ #2 RIP: 0010:blk_end_request_all+0x68/0x70 Call Trace: <IRQ> dm_softirq_done+0x326/0x3d0 [dm_mod] blk_done_softirq+0x19b/0x1e0 __do_softirq+0x128/0x60d irq_exit+0x100/0x110 smp_call_function_single_interrupt+0x90/0x330 call_function_single_interrupt+0xf/0x20 </IRQ> Fixes:f9d03f96b9
("block: improve handling of the magic discard payload") Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: <stable@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -3150,6 +3150,10 @@ static void __blk_rq_prep_clone(struct request *dst, struct request *src)
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dst->cpu = src->cpu;
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dst->__sector = blk_rq_pos(src);
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dst->__data_len = blk_rq_bytes(src);
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if (src->rq_flags & RQF_SPECIAL_PAYLOAD) {
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dst->rq_flags |= RQF_SPECIAL_PAYLOAD;
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dst->special_vec = src->special_vec;
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}
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dst->nr_phys_segments = src->nr_phys_segments;
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dst->ioprio = src->ioprio;
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dst->extra_len = src->extra_len;
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