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