linux-kernel - [PATCH] [4/7] Add blk_q

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Message-Id: <20080307091325.04DE91B419C@basil.firstfloor.org>
Date:	Fri,  7 Mar 2008 10:13:25 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: [PATCH] [4/7] Add blk_q_mask


Converts the queue bounce_pfn to a DMA mask suitable for the mask allocator

Signed-off-by: Andi Kleen <ak@...e.de>

---
 include/linux/blkdev.h |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux/include/linux/blkdev.h
===================================================================
--- linux.orig/include/linux/blkdev.h
+++ linux/include/linux/blkdev.h
@@ -814,6 +814,11 @@ static inline unsigned int block_size(st
 	return bdev->bd_block_size;
 }
 
+static inline u64 blk_q_mask(struct request_queue *q)
+{
+	return ~(-1LL << (PAGE_SHIFT + fls64(q->bounce_pfn)));
+}
+
 typedef struct {struct page *v;} Sector;
 
 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
--
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