Provided by: systemtap-doc_2.3-1ubuntu1_all bug


       probe::ioblock_trace.bounce - Fires whenever a buffer bounce is needed for at least one
       page of a block IO request.






       name - name of the probe point q - request queue on which this bio was queued.  devname -
       device for which a buffer bounce was needed.  ino - i-node number of the mapped file
       bytes_done - number of bytes transferred sector - beginning sector for the entire bio
       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 rw - binary trace for read/write request 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.  size - total size in
       bytes bdev - target block device bdev_contains - points to the device object which
       contains the partition (when bio structure represents a partition) p_start_sect - points
       to the start sector of the partition structure of the device


       The process creating a block IO request.