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