binary trace for read/write request

i-node number of the mapped file

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

block device name

name of the probe point

target block device

request queue on which this bio was queued.

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

operations and flags

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

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

number of bytes transferred

beginning sector for the entire bio

total size in bytes

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