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