NAME¶
probe::ioblock.request - Fires whenever making a generic block I/O request.
SYNOPSIS¶
ioblock.request
VALUES¶
None
DESCRIPTION¶
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
CONTEXT¶
The process makes block I/O request