/usr/share/systemtap/tapset/linux/ioblock.stp is in systemtap-common 2.6-0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 | // Block I/O tapset
// Copyright (C) 2006 Intel Corp.
// Copyright (C) 2006 IBM Corp.
// Copyright (C) 2014 Red Hat Inc.
//
// 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>
#ifdef STAPCONF_BLK_TYPES
#include <linux/blk_types.h>
#else
#define REQ_WRITE (1 << BIO_RW)
#endif
%}
/* get i-node number of mapped file */
function __bio_ino:long(bio:long)
%{ /* pure */
struct bio *bio = (struct bio *)(long)STAP_ARG_bio;
struct page *bv_page = (bio && bio->bi_vcnt) ? kread(&(bio->bi_io_vec[0].bv_page)) : NULL;
struct address_space *mapping;
struct inode *host;
STAP_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)
STAP_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)STAP_ARG_rw;
STAP_RETVALUE = (rw & REQ_WRITE);
%}
/* returns R for read, W for write */
function bio_rw_str(rw:long)
{
return bio_rw_num(rw) == BIO_READ ? "R" : "W"
}
/* returns start sector */
function __bio_start_sect:long(bio:long)
{
try {
return @cast(bio, "bio")->bi_bdev->bd_part->start_sect
} catch {
return -1
}
}
/* returns the block device name */
function __bio_devname:string(bio:long)
{
return bdevname(@cast(bio, "bio")->bi_bdev)
}
global BIO_READ = 0, BIO_WRITE = 1
/**
* probe ioblock.request - Fires whenever making a generic block I/O request.
*
* @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
*/
probe ioblock.request = kernel.function ("generic_make_request")
{
name = "ioblock.request"
devname = __bio_devname($bio)
ino = __bio_ino($bio)
sector = @choose_defined($bio->bi_iter->bi_sector, $bio->bi_sector)
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = @choose_defined($bio->bi_iter->bi_idx, $bio->bi_idx)
phys_segments = $bio->bi_phys_segments
hw_segments = @choose_defined($bio->bi_hw_segments, 0)
size = @choose_defined($bio->bi_iter->bi_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.
*
* @name - name of the probe point
* @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
* @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
*
* Context:
* The process signals the transfer is done.
*/
probe ioblock.end = kernel.function("bio_endio")
{
name = "ioblock.end"
devname = __bio_devname($bio)
ino = __bio_ino($bio)
bytes_done = @choose_defined($bytes_done,
@choose_defined($bio->bi_iter->bi_size,
$bio->bi_size))
error = $error
sector = @choose_defined($bio->bi_iter->bi_sector, $bio->bi_sector)
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = @choose_defined($bio->bi_iter->bi_idx, $bio->bi_idx)
phys_segments = $bio->bi_phys_segments
hw_segments = @choose_defined($bio->bi_hw_segments, 0)
size = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
}
/**
* probe ioblock_trace.bounce - Fires whenever a buffer bounce is needed for at least one page of a block IO request.
*
* @name - name of the probe point
* @q - request queue on which this bio was queued.
* @devname - device for which a buffer bounce was needed.
* @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 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.
* @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 creating a block IO request.
*/
probe ioblock_trace.bounce = kernel.trace("block_bio_bounce")
{
name = "ioblock_trace.bounce"
q = $q
devname = __bio_devname($bio)
ino = __bio_ino($bio)
bytes_done = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
sector = @choose_defined($bio->bi_iter->bi_sector, $bio->bi_sector)
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = @choose_defined($bio->bi_iter->bi_idx, $bio->bi_idx)
phys_segments = $bio->bi_phys_segments
size = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
bdev_contains = $bio->bi_bdev->bd_contains
bdev = $bio->bi_bdev
p_start_sect = __bio_start_sect($bio)
}
/**
* probe ioblock_trace.request - Fires just as a generic block I/O request is created for a bio.
*
* @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
*/
probe ioblock_trace.request = kernel.trace("block_bio_queue")
{
name = "ioblock_trace.request"
q = $q
devname = __bio_devname($bio)
ino = __bio_ino($bio)
bytes_done = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
sector = @choose_defined($bio->bi_iter->bi_sector, $bio->bi_sector)
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = @choose_defined($bio->bi_iter->bi_idx, $bio->bi_idx)
phys_segments = $bio->bi_phys_segments
size = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
bdev_contains = $bio->bi_bdev->bd_contains
bdev = $bio->bi_bdev
p_start_sect = __bio_start_sect($bio)
}
/**
* probe ioblock_trace.end - Fires whenever a block I/O transfer is complete.
*
* @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 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.
* @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 signals the transfer is done.
*/
probe ioblock_trace.end = kernel.trace("block_bio_complete")
{
name = "ioblock_trace.end"
q = $q
devname = __bio_devname($bio)
ino = __bio_ino($bio)
bytes_done = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
sector = @choose_defined($bio->bi_iter->bi_sector, $bio->bi_sector)
flags = $bio->bi_flags
rw = $bio->bi_rw
vcnt = $bio->bi_vcnt
idx = @choose_defined($bio->bi_iter->bi_idx, $bio->bi_idx)
phys_segments = $bio->bi_phys_segments
size = @choose_defined($bio->bi_iter->bi_size, $bio->bi_size)
bdev_contains = $bio->bi_bdev->bd_contains
bdev = $bio->bi_bdev
p_start_sect = __bio_start_sect($bio)
}
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