Differential D27225 Diff 80108 head/sys/dev/xen/blkback/blkback.c

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Show First 20 Lines • Show All 137 Lines • ▼ Show 20 Lines	#define DPRINTF(fmt, args...) \
printf("xbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)		printf("xbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)
#else		#else
#define DPRINTF(fmt, args...) do {} while(0)		#define DPRINTF(fmt, args...) do {} while(0)
#endif		#endif

/**		/**
* The maximum mapped region size per request we will allow in a negotiated		* The maximum mapped region size per request we will allow in a negotiated
* block-front/back communication channel.		* block-front/back communication channel.
		* Use old default of MAXPHYS == 128K.
*/		*/
#define XBB_MAX_REQUEST_SIZE \		#define XBB_MAX_REQUEST_SIZE \
MIN(MAXPHYS, BLKIF_MAX_SEGMENTS_PER_REQUEST * PAGE_SIZE)		MIN(128 * 1024, BLKIF_MAX_SEGMENTS_PER_REQUEST * PAGE_SIZE)

/**		/**
* The maximum number of segments (within a request header and accompanying		* The maximum number of segments (within a request header and accompanying
* segment blocks) per request we will allow in a negotiated block-front/back		* segment blocks) per request we will allow in a negotiated block-front/back
* communication channel.		* communication channel.
*/		*/
#define XBB_MAX_SEGMENTS_PER_REQUEST \		#define XBB_MAX_SEGMENTS_PER_REQUEST \
(MIN(UIO_MAXIOV, \		(MIN(UIO_MAXIOV, \
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