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/*
* Copyright (c) 2003-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/uio.h>
#include <xfs/xfs.h>
#include <xfs/command.h>
#include <xfs/input.h>
#include "init.h"
#include "io.h"
static cmdinfo_t pwrite_cmd;
static void
pwrite_help(void)
{
printf(_(
"\n"
" writes a range of bytes (in block size increments) from the given offset\n"
"\n"
" Example:\n"
" 'pwrite 512 20' - writes 20 bytes at 512 bytes into the open file\n"
"\n"
" Writes into a segment of the currently open file, using either a buffer\n"
" filled with a set pattern (0xcdcdcdcd) or data read from an input file.\n"
" The writes are performed in sequential blocks starting at offset, with the\n"
" blocksize tunable using the -b option (default blocksize is 4096 bytes),\n"
" unless a different write pattern is requested.\n"
" -S -- use an alternate seed number for filling the write buffer\n"
" -i -- input file, source of data to write (used when writing forward)\n"
" -d -- open the input file for direct IO\n"
" -s -- skip a number of bytes at the start of the input file\n"
" -w -- call fdatasync(2) at the end (included in timing results)\n"
" -W -- call fsync(2) at the end (included in timing results)\n"
" -B -- write backwards through the range from offset (backwards N bytes)\n"
" -F -- write forwards through the range of bytes from offset (default)\n"
" -R -- write at random offsets in the specified range of bytes\n"
" -Z N -- zeed the random number generator (used when writing randomly)\n"
" (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
#ifdef HAVE_PWRITEV
" -V N -- use vectored IO with N iovecs of blocksize each (pwritev)\n"
#endif
"\n"));
}
#ifdef HAVE_PWRITEV
static int
do_pwritev(
int fd,
off64_t offset,
ssize_t count,
ssize_t buffer_size)
{
int vecs = 0;
ssize_t oldlen = 0;
ssize_t bytes = 0;
/* trim the iovec if necessary */
if (count < buffersize) {
size_t len = 0;
while (len + iov[vecs].iov_len < count) {
len += iov[vecs].iov_len;
vecs++;
}
oldlen = iov[vecs].iov_len;
iov[vecs].iov_len = count - len;
vecs++;
} else {
vecs = vectors;
}
bytes = pwritev(fd, iov, vectors, offset);
/* restore trimmed iov */
if (oldlen)
iov[vecs - 1].iov_len = oldlen;
return bytes;
}
#else
#define do_pwritev(fd, offset, count, buffer_size) (0)
#endif
static int
do_pwrite(
int fd,
off64_t offset,
ssize_t count,
ssize_t buffer_size)
{
if (!vectors)
return pwrite64(fd, buffer, min(count, buffer_size), offset);
return do_pwritev(fd, offset, count, buffer_size);
}
static int
write_random(
off64_t offset,
long long count,
unsigned int seed,
long long *total)
{
off64_t off, range;
ssize_t bytes;
int ops = 0;
srandom(seed);
if ((bytes = (offset % buffersize)))
offset -= bytes;
offset = max(0, offset);
if ((bytes = (count % buffersize)))
count += bytes;
count = max(buffersize, count);
range = count - buffersize;
*total = 0;
while (count > 0) {
off = ((offset + (random() % range)) / buffersize) * buffersize;
bytes = do_pwrite(file->fd, off, buffersize, buffersize);
if (bytes == 0)
break;
if (bytes < 0) {
perror("pwrite64");
return -1;
}
ops++;
*total += bytes;
if (bytes < buffersize)
break;
count -= bytes;
}
return ops;
}
static int
write_backward(
off64_t offset,
long long *count,
long long *total)
{
off64_t end, off = offset;
ssize_t bytes = 0, bytes_requested;
long long cnt = *count;
int ops = 0;
if ((end = off - cnt) < 0) {
cnt += end; /* subtraction, end is negative */
end = 0;
}
*total = 0;
*count = cnt;
/* Do initial unaligned write if needed */
if ((bytes_requested = (off % buffersize))) {
bytes_requested = min(cnt, bytes_requested);
off -= bytes_requested;
bytes = do_pwrite(file->fd, off, bytes_requested, buffersize);
if (bytes == 0)
return ops;
if (bytes < 0) {
perror("pwrite64");
return -1;
}
ops++;
*total += bytes;
if (bytes < bytes_requested)
return ops;
cnt -= bytes;
}
/* Iterate backward through the rest of the range */
while (cnt > end) {
bytes_requested = min(cnt, buffersize);
off -= bytes_requested;
bytes = do_pwrite(file->fd, off, cnt, buffersize);
if (bytes == 0)
break;
if (bytes < 0) {
perror("pwrite64");
return -1;
}
ops++;
*total += bytes;
if (bytes < bytes_requested)
break;
cnt -= bytes;
}
return ops;
}
static int
write_buffer(
off64_t offset,
long long count,
size_t bs,
int fd,
off64_t skip,
long long *total)
{
ssize_t bytes;
long long bar = min(bs, count);
int ops = 0;
*total = 0;
while (count >= 0) {
if (fd > 0) { /* input file given, read buffer first */
if (read_buffer(fd, skip + *total, bs, &bar, 0, 1) < 0)
break;
}
bytes = do_pwrite(file->fd, offset, count, bar);
if (bytes == 0)
break;
if (bytes < 0) {
perror("pwrite64");
return -1;
}
ops++;
*total += bytes;
if (bytes < min(count, bar))
break;
offset += bytes;
count -= bytes;
if (count == 0)
break;
}
return ops;
}
static int
pwrite_f(
int argc,
char **argv)
{
size_t bsize;
off64_t offset, skip = 0;
long long count, total, tmp;
unsigned int zeed = 0, seed = 0xcdcdcdcd;
size_t fsblocksize, fssectsize;
struct timeval t1, t2;
char s1[64], s2[64], ts[64];
char *sp, *infile = NULL;
int Cflag, qflag, uflag, dflag, wflag, Wflag;
int direction = IO_FORWARD;
int c, fd = -1;
Cflag = qflag = uflag = dflag = wflag = Wflag = 0;
init_cvtnum(&fsblocksize, &fssectsize);
bsize = fsblocksize;
while ((c = getopt(argc, argv, "b:Cdf:i:qs:S:uV:wWZ:")) != EOF) {
switch (c) {
case 'b':
tmp = cvtnum(fsblocksize, fssectsize, optarg);
if (tmp < 0) {
printf(_("non-numeric bsize -- %s\n"), optarg);
return 0;
}
bsize = tmp;
break;
case 'C':
Cflag = 1;
break;
case 'F':
direction = IO_FORWARD;
break;
case 'B':
direction = IO_BACKWARD;
break;
case 'R':
direction = IO_RANDOM;
break;
case 'd':
dflag = 1;
break;
case 'f':
case 'i':
infile = optarg;
break;
case 's':
skip = cvtnum(fsblocksize, fssectsize, optarg);
if (skip < 0) {
printf(_("non-numeric skip -- %s\n"), optarg);
return 0;
}
break;
case 'S':
seed = strtoul(optarg, &sp, 0);
if (!sp || sp == optarg) {
printf(_("non-numeric seed -- %s\n"), optarg);
return 0;
}
break;
case 'q':
qflag = 1;
break;
case 'u':
uflag = 1;
break;
case 'V':
vectors = strtoul(optarg, &sp, 0);
if (!sp || sp == optarg) {
printf(_("non-numeric vector count == %s\n"),
optarg);
return 0;
}
break;
case 'w':
wflag = 1;
break;
case 'W':
Wflag = 1;
break;
case 'Z':
zeed = strtoul(optarg, &sp, 0);
if (!sp || sp == optarg) {
printf(_("non-numeric seed -- %s\n"), optarg);
return 0;
}
break;
default:
return command_usage(&pwrite_cmd);
}
}
if (((skip || dflag) && !infile) || (optind != argc - 2))
return command_usage(&pwrite_cmd);
if (infile && direction != IO_FORWARD)
return command_usage(&pwrite_cmd);
offset = cvtnum(fsblocksize, fssectsize, argv[optind]);
if (offset < 0) {
printf(_("non-numeric offset argument -- %s\n"), argv[optind]);
return 0;
}
optind++;
count = cvtnum(fsblocksize, fssectsize, argv[optind]);
if (count < 0) {
printf(_("non-numeric length argument -- %s\n"), argv[optind]);
return 0;
}
if (alloc_buffer(bsize, uflag, seed) < 0)
return 0;
c = IO_READONLY | (dflag ? IO_DIRECT : 0);
if (infile && ((fd = openfile(infile, NULL, c, 0)) < 0))
return 0;
gettimeofday(&t1, NULL);
switch (direction) {
case IO_RANDOM:
if (!zeed) /* srandom seed */
zeed = time(NULL);
c = write_random(offset, count, zeed, &total);
break;
case IO_FORWARD:
c = write_buffer(offset, count, bsize, fd, skip, &total);
break;
case IO_BACKWARD:
c = write_backward(offset, &count, &total);
break;
default:
total = 0;
ASSERT(0);
}
if (c < 0)
goto done;
if (Wflag)
fsync(file->fd);
if (wflag)
fdatasync(file->fd);
if (qflag)
goto done;
gettimeofday(&t2, NULL);
t2 = tsub(t2, t1);
/* Finally, report back -- -C gives a parsable format */
timestr(&t2, ts, sizeof(ts), Cflag ? VERBOSE_FIXED_TIME : 0);
if (!Cflag) {
cvtstr((double)total, s1, sizeof(s1));
cvtstr(tdiv((double)total, t2), s2, sizeof(s2));
printf(_("wrote %lld/%lld bytes at offset %lld\n"),
total, count, (long long)offset);
printf(_("%s, %d ops; %s (%s/sec and %.4f ops/sec)\n"),
s1, c, ts, s2, tdiv((double)c, t2));
} else {/* bytes,ops,time,bytes/sec,ops/sec */
printf("%lld,%d,%s,%.3f,%.3f\n",
total, c, ts,
tdiv((double)total, t2), tdiv((double)c, t2));
}
done:
if (infile)
close(fd);
return 0;
}
void
pwrite_init(void)
{
pwrite_cmd.name = "pwrite";
pwrite_cmd.altname = "w";
pwrite_cmd.cfunc = pwrite_f;
pwrite_cmd.argmin = 2;
pwrite_cmd.argmax = -1;
pwrite_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
pwrite_cmd.args =
_("[-i infile [-d] [-s skip]] [-b bs] [-S seed] [-wW] [-FBR [-Z N]] [-V N] off len");
pwrite_cmd.oneline =
_("writes a number of bytes at a specified offset");
pwrite_cmd.help = pwrite_help;
add_command(&pwrite_cmd);
}
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