points to the start sector of the partition structure of the device

bio vector count which represents number of array element (page, offset, length) which make up this I/O request

number of bytes transferred

i-node number of the mapped file

block device name

binary trace for read/write request

target block device

points to the device object which contains the partition (when bio structure represents a partition)

see below BIO_UPTODATE 0 ok after I/O completion BIO_RW_BLOCK 1 RW_AHEAD set, and read/write would block BIO_EOF 2 out-out-bounds error BIO_SEG_VALID 3 nr_hw_seg valid BIO_CLONED 4 doesn't own data BIO_BOUNCED 5 bio is a bounce bio BIO_USER_MAPPED 6 contains user pages BIO_EOPNOTSUPP 7 not supported

offset into the bio vector array phys_segments - number of segments in this bio after physical address coalescing is performed.

name of the probe point

request queue on which this bio was queued.

operations and flags

beginning sector for the entire bio

total size in bytes