probe::ioblock_trace.request — Fires just as a generic block I/O request is created for a bio.
ioblock_trace.request
bdev_containspoints to the device object which contains the partition (when bio structure represents a partition)
bdevtarget block device
p_start_sectpoints to the start sector of the partition structure of the device
idx
offset into the bio vector array
phys_segments - number of segments in this bio after physical address coalescing is performed.
opfoperations and flags
vcntbio vector count which represents number of array element (page, offset, length) which make up this I/O request
devnameblock device name
bytes_donenumber of bytes transferred
sectorbeginning sector for the entire bio
rwbinary trace for read/write request
qrequest queue on which this bio was queued.
namename of the probe point
inoi-node number of the mapped file
sizetotal size in bytes
flagssee 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