probe::ioblock_trace.bounce — Fires whenever a buffer bounce is needed for at least one page of a block IO request.
ioblock_trace.bounce
devname
device for which a buffer bounce was needed.
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
vcnt
bio vector count which represents number of array element (page, offset, length) which makes 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.
sector
beginning sector for the entire bio
bdev
target block device
size
total size in bytes
opf
operations and flags
bytes_done
number of bytes transferred
ino
i-node number of the mapped file
name
name of the probe point
p_start_sect
points to the start sector of the partition structure of the device
rw
binary trace for read/write request
bdev_contains
points to the device object which contains the partition (when bio structure represents a partition)
q
request queue on which this bio was queued.