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