t10_pi_ref_tag

Name:t10_pi_ref_tag

Proto:static inline unsigned int t10_pi_ref_tag(struct request *rq)

Type:unsigned int

Parameter:

Type	Parameter	Name
struct request *	rq

42

shift = log2 - log base 2 of 32-bit or a 64-bit unsigned value*@n: parameter* constant-capable log of base 2 calculation* - this can be used to initialise global variables from constant data, hence* the massive ternary operator construction* selects the (queue_logical_block_size(q))

45

If interval_exp Then shift = interval_exp

48

Return lk_rq_pos() : the current sector* blk_rq_bytes() : bytes left in the entire request* blk_rq_cur_bytes() : bytes left in the current segment* blk_rq_err_bytes() : bytes left till the next error boundary* blk_rq_sectors() : sectors left in the entire >> shift - The basic unit of block I/O is a sector. It is used in a number of contexts* in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9* bytes. Variables of type sector_t represent an offset or size that is a* multiple of 512 bytes & 0xffffffff

**Caller**
Name	Describe
t10_pi_type1_prepare	10_pi_type1_prepare - prepare PI prior submitting request to device@rq: request with PI that should be prepared For Type 1/Type 2, the virtual start sector is the one that was* originally submitted by the block layer for the ref_tag usage. Due to
t10_pi_type1_complete	10_pi_type1_complete - prepare PI prior returning request to the blk layer@rq: request with PI that should be prepared@nr_bytes: total bytes to prepare* For Type 1/Type 2, the virtual start sector is the one that was

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