BIOSET_CREATE(9) The Linux VFS BIOSET_CREATE(9)NAME
bioset_create - Create a bio_set
SYNOPSIS
struct bio_set * bioset_create(unsigned int pool_size, unsigned int front_pad);
ARGUMENTS
pool_size
Number of bio and bio_vecs to cache in the mempool
front_pad
Number of bytes to allocate in front of the returned bio
DESCRIPTION
Set up a bio_set to be used with bio_alloc_bioset. Allows the caller to ask for a number of bytes to be allocated in front of the bio.
Front pad allocation is useful for embedding the bio inside another structure, to avoid allocating extra data to go with the bio. Note that
the bio must be embedded at the END of that structure always, or things will break badly.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BIOSET_CREATE(9)
Check Out this Related Man Page
PROBE::IOBLOCK_TRACE(3stap) IO Scheduler and block IO Taps PROBE::IOBLOCK_TRACE(3stap)NAME
probe::ioblock_trace.request - Fires just as a generic block I/O request is created for a bio.
SYNOPSIS
ioblock_trace.request
VALUES
None
DESCRIPTION
name - name of the probe point q - request queue on which this bio was queued. devname - block device name 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 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. 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
SystemTap Tapset Reference June 2014 PROBE::IOBLOCK_TRACE(3stap)
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