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// Block I/O tapset
// Copyright (C) 2006 Intel Corp.
// Copyright (C) 2006 IBM Corp.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
%{
#include <linux/bio.h>
#include <linux/genhd.h>
%}
/* get i-node number of mapped file */
function __bio_ino:long(bio:long)
%{ /* pure */
struct bio *bio = (struct bio *)(long)THIS->bio;
struct page *bv_page = bio? kread(&(bio->bi_io_vec[0].bv_page)) : NULL;
struct address_space *mapping;
struct inode *host;
THIS->__retvalue = -1;
if (bv_page && !PageSlab(bv_page) && !PageSwapCache(bv_page)) {
mapping = kread(&(bv_page->mapping));
if (mapping && ((unsigned long)mapping & PAGE_MAPPING_ANON) == 0) {
host = kread(&(mapping->host));
if (host)
THIS->__retvalue = kread(&(host->i_ino));
}
}
CATCH_DEREF_FAULT();
%}
/* returns 0 for read, 1 for write */
function bio_rw_num:long(rw:long)
%{ /* pure */
long rw = (long)THIS->rw;
THIS->__retvalue = (rw & (1 << BIO_RW));
%}
/* returns R for read, W for write */
function bio_rw_str(rw)
{
return bio_rw_num(rw) == BIO_READ ? "R" : "W"
}
/* returns start sector */
function __bio_start_sect:long(bio:long)
%{ /* pure */
struct bio *bio = (struct bio *)(long)THIS->bio;
struct block_device *bi_bdev = bio? kread(&(bio->bi_bdev)) : NULL;
struct hd_struct *bd_part = bi_bdev? kread(&(bi_bdev->bd_part)) : NULL;
if (bd_part == NULL)
THIS->__retvalue = -1;
else
THIS->__retvalue = kread(&(bd_part->start_sect));
CATCH_DEREF_FAULT();
%}
/* returns the block device name */
function __bio_devname:string(bio:long)
%{ /* pure */
char b[BDEVNAME_SIZE];
struct bio *bio = (struct bio *)(long)THIS->bio;
struct block_device *bdev = kread(&(bio->bi_bdev));
if (bdev == NULL) {
strlcpy(THIS->__retvalue, "N/A", MAXSTRINGLEN);
} else {
const char *name = bdevname(bdev, b); /* FIXME: deref hazard! */
deref_string(THIS->__retvalue, name, MAXSTRINGLEN);
}
CATCH_DEREF_FAULT();
%}
global BIO_READ = 0, BIO_WRITE = 1
/* probe ioblock.request
*
* Fires whenever making a generic block I/O request.
*
* Context:
* The process makes block I/O request
*
* Variables:
* 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
*/
probe ioblock.request = kernel.function ("generic_make_request")
{
devname = __bio_devname($bio)
ino = __bio_ino($bio)
sector = $bio->bi_sector
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = $bio->bi_idx
phys_segments = $bio->bi_phys_segments
hw_segments = $bio->bi_hw_segments
size = $bio->bi_size
bdev = $bio->bi_bdev
bdev_contains = $bio->bi_bdev->bd_contains
p_start_sect = __bio_start_sect($bio)
}
/* probe ioblock.end
*
* Fires whenever a block I/O transfer is complete.
*
* Context:
* The process signals the transfer is done.
*
* Variables:
* devname - block device name
* ino - i-node number of the mapped file
* byte_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
* error - 0 on success
* 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.
* hw_segments - number of segments after physical and DMA remapping
* hardware coalescing is performed
* size - total size in bytes
*/
probe ioblock.end = kernel.function("bio_endio")
{
devname = __bio_devname($bio)
ino = __bio_ino($bio)
bytes_done = $bytes_done
error = $error
sector = $bio->bi_sector
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = $bio->bi_idx
phys_segments = $bio->bi_phys_segments
hw_segments = $bio->bi_hw_segments
size = $bio->bi_size
}
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