probe::ioblock_trace.request — Fires just as a generic block I/O request is created for a bio.
operations and flags
name of the probe point
request queue on which this bio was queued.
number of bytes transferred
points to the start sector of the partition structure of the device
target block device
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
i-node number of the mapped file
binary trace for read/write request
points to the device object which contains the partition (when bio structure represents a partition)
beginning sector for the entire bio
block device name
total size in bytes
offset into the bio vector array
phys_segments - number of segments in this bio after physical address coalescing is performed.