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

device for which a buffer bounce was needed.

binary trace for read/write request

number of bytes transferred

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

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

beginning sector for the entire bio

name of the probe point

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

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

target block device

operations and flags

request queue on which this bio was queued.

total size in bytes

i-node number of the mapped file