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

NAME

       probe::ioblock.request - Fires whenever making a generic block I/O request.

SYNOPSIS

       ioblock.request

VALUES

       None

DESCRIPTION

       name - name of the probe point devname - block device name ino - i-node number of the
       mapped file 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 make 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 hw_segments - number of segments after physical and DMA remapping
       hardware 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

CONTEXT

       The process makes block I/O request