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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: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -175,6 +175,7 @@ enum rq_flag_bits {
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__REQ_IO_STAT, /* account I/O stat */
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__REQ_MIXED_MERGE, /* merge of different types, fail separately */
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__REQ_KERNEL, /* direct IO to kernel pages */
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__REQ_PM, /* runtime pm request */
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__REQ_NR_BITS, /* stops here */
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};
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@ -223,5 +224,6 @@ enum rq_flag_bits {
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#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
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#define REQ_SECURE (1 << __REQ_SECURE)
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#define REQ_KERNEL (1 << __REQ_KERNEL)
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#define REQ_PM (1 << __REQ_PM)
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#endif /* __LINUX_BLK_TYPES_H */
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