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