Section: IO Scheduler and block IO Taps (3stap)
Updated: August 2015
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probe::ioblock_trace.end - Fires whenever a block I/O transfer is complete.
request queue on which this bio was queued.
number of bytes transferred
bio vector count which represents number of array element (page, offset, length) which makes up this I/O request
i-node number of the mapped file
total size in bytes
name of the probe point
points to the device object which contains the partition (when bio structure represents a partition)
binary trace for read/write request
block device name
beginning sector for the entire bio
offset into the bio vector array
- number of segments in this bio after physical address coalescing is performed.
points to the start sector of the partition structure of the device
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
The process signals the transfer is done.
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Time: 20:06:01 GMT, August 25, 2015