probe::ioblock.request - Fires whenever making a generic block I/O
request.
name
name of the probe point
sector
beginning sector for the entire bio
idx
offset into the bio vector array
hw_segments
number of segments after physical and DMA remapping
hardware coalescing is performed
ino
i-node number of the mapped file
size
total size in bytes
rw
binary trace for read/write request
bdev_contains
points to the device object which contains the partition
(when bio structure represents a partition)
p_start_sect
points to the start sector of the partition structure of
the device
devname
block device name
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
opf
operations and flags
phys_segments
number of segments in this bio after physical address
coalescing is performed
bdev
target block device
vcnt
bio vector count which represents number of array element
(page, offset, length) which make up this I/O request
The process makes block I/O request