target block device
bio vector count which represents number of array element (page, offset, length) which make up this I/O request
points to the start sector of the partition structure of the device
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
number of bytes transferred
operations and flags
request queue on which this bio was queued.
i-node number of the mapped file
total size in bytes
binary trace for read/write request
points to the device object which contains the partition (when bio structure represents a partition)
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.
beginning sector for the entire bio
The process makes block I/O request