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Commit 66311274 authored by Lin Ming's avatar Lin Ming Committed by Jens Axboe
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block: add a flag to identify PM request 



Add a flag REQ_PM to identify the request is PM related, such requests
will not change the device request queue's runtime status. It is
intended to be used in driver's runtime PM callback, so that driver can
perform some IO to the device there with the queue's runtime status
unaffected. e.g. in SCSI disk's runtime suspend callback, the disk will
be put into stopped power state, and this require sending a command to
the device. Such command processing should not change the disk's runtime
status.

Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarAaron Lu <aaron.lu@intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent a937536b

include/linux/blk_types.h

+2 −0
Original line number Diff line number Diff line
@@ -175,6 +175,7 @@ enum rq_flag_bits { 
	__REQ_IO_STAT,		/* account I/O stat */

	__REQ_MIXED_MERGE,	/* merge of different types, fail separately */

	__REQ_KERNEL, 		/* direct IO to kernel pages */

	__REQ_PM,		/* runtime pm request */

	__REQ_NR_BITS,		/* stops here */

};
@@ -223,5 +224,6 @@ enum rq_flag_bits { 
#define REQ_MIXED_MERGE		(1 << __REQ_MIXED_MERGE)

#define REQ_SECURE		(1 << __REQ_SECURE)

#define REQ_KERNEL		(1 << __REQ_KERNEL)

#define REQ_PM			(1 << __REQ_PM)



#endif /* __LINUX_BLK_TYPES_H */