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