total size in bytes
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
operations and flags
points to the device object which contains the partition (when bio structure represents a partition)
binary trace for read/write request
i-node number of the mapped file
beginning sector for the entire bio
target block device
name of the probe point
request queue on which this bio was queued.
number of bytes transferred
block device name
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.
The process makes block I/O request