operations and flags
0 on success
name of the probe point
number of bytes transferred
number of segments after physical and DMA remapping hardware coalescing is performed
bio vector count which represents number of array element (page, offset, length) which makes up this I/O request
binary trace for read/write request
block device name
offset into the bio vector array
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
number of segments in this bio after physical address coalescing is performed.
beginning sector for the entire bio
i-node number of the mapped file
total size in bytes
The process signals the transfer is done.