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PROBE::IOBLOCK.END(3stap) IO Scheduler and block IO Taps PROBE::IOBLOCK.END(3stap)

NAME

probe::ioblock.end - Fires whenever a block I/O transfer is complete.

SYNOPSIS

ioblock.end

VALUES

vcnt

bio vector count which represents number of array element (page, offset, length) which makes up this I/O request

size

total size in bytes

hw_segments

number of segments after physical and DMA remapping hardware coalescing is performed

bytes_done

number of bytes transferred

sector

beginning sector for the entire bio

error

0 on success

idx

offset into the bio vector array

rw

binary trace for read/write request

devname

block device name

name

name of the probe point

phys_segments

number of segments in this bio after physical address coalescing is performed.

opf

operations and flags

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

ino

i-node number of the mapped file

CONTEXT

The process signals the transfer is done.

SEE ALSO0

tapset::ioblock(3stap)

October 2025 SystemTap Tapset Reference