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

operations and flags

target block device

request queue on which this bio was queued.

name of the probe point

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

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

binary trace for read/write request

total size in bytes

number of bytes transferred

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

i-node number of the mapped file

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

block device name

beginning sector for the entire bio