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glibc/io/tst-copy_file_range.c
Florian Weimer 5a659ccc0e io: Remove copy_file_range emulation [BZ #24744] 
The kernel is evolving this interface (e.g., removal of the
restriction on cross-device copies), and keeping up with that
is difficult.  Applications which need the function should
run kernels which support the system call instead of relying on
the imperfect glibc emulation.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2019-06-28 09:39:21 +02:00

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/* Tests for copy_file_range.
Copyright (C) 2017-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xunistd.h>
/* Boolean flags which indicate whether to use pointers with explicit
output flags. */
static int do_inoff;
static int do_outoff;
/* Name and descriptors of the input files. Files are truncated and
reopened (with O_RDWR) between tests. */
static char *infile;
static int infd;
static char *outfile;
static int outfd;
/* Input and output offsets. Set according to do_inoff and do_outoff
before the test. The offsets themselves are always set to
zero. */
static off64_t inoff;
static off64_t *pinoff;
static off64_t outoff;
static off64_t *poutoff;
/* These are a collection of copy sizes used in tests. */
enum { maximum_size = 99999 };
static const int typical_sizes[] =
{ 0, 1, 2, 3, 1024, 2048, 4096, 8191, 8192, 8193, maximum_size };
/* The random contents of this array can be used as a pattern to check
for correct write operations. */
static unsigned char random_data[maximum_size];
/* The size chosen by the test harness. */
static int current_size;
/* Perform a copy of a file. */
static void
simple_file_copy (void)
{
xwrite (infd, random_data, current_size);
int length;
int in_skipped; /* Expected skipped bytes in input. */
if (do_inoff)
{
xlseek (infd, 1, SEEK_SET);
inoff = 2;
length = current_size - 3;
in_skipped = 2;
}
else
{
xlseek (infd, 3, SEEK_SET);
length = current_size - 5;
in_skipped = 3;
}
int out_skipped; /* Expected skipped bytes before the written data. */
if (do_outoff)
{
xlseek (outfd, 4, SEEK_SET);
outoff = 5;
out_skipped = 5;
}
else
{
xlseek (outfd, 6, SEEK_SET);
length = current_size - 6;
out_skipped = 6;
}
if (length < 0)
length = 0;
TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
length, 0), length);
if (do_inoff)
{
TEST_COMPARE (inoff, 2 + length);
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
}
else
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 3 + length);
if (do_outoff)
{
TEST_COMPARE (outoff, 5 + length);
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 4);
}
else
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 6 + length);
struct stat64 st;
xfstat (outfd, &st);
if (length > 0)
TEST_COMPARE (st.st_size, out_skipped + length);
else
{
/* If we did not write anything, we also did not add any
padding. */
TEST_COMPARE (st.st_size, 0);
return;
}
xlseek (outfd, 0, SEEK_SET);
char *bytes = xmalloc (st.st_size);
TEST_COMPARE (read (outfd, bytes, st.st_size), st.st_size);
for (int i = 0; i < out_skipped; ++i)
TEST_COMPARE (bytes[i], 0);
TEST_VERIFY (memcmp (bytes + out_skipped, random_data + in_skipped,
length) == 0);
free (bytes);
}
/* Test that a short input file results in a shortened copy. */
static void
short_copy (void)
{
if (current_size == 0)
/* Nothing to shorten. */
return;
/* Two subtests, one with offset 0 and current_size - 1 bytes, and
another one with current_size bytes, but offset 1. */
for (int shift = 0; shift < 2; ++shift)
{
if (test_verbose > 0)
printf ("info: shift=%d\n", shift);
xftruncate (infd, 0);
xlseek (infd, 0, SEEK_SET);
xwrite (infd, random_data, current_size - !shift);
if (do_inoff)
{
inoff = shift;
xlseek (infd, 2, SEEK_SET);
}
else
{
inoff = 3;
xlseek (infd, shift, SEEK_SET);
}
ftruncate (outfd, 0);
xlseek (outfd, 0, SEEK_SET);
outoff = 0;
/* First call copies current_size - 1 bytes. */
TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
current_size, 0), current_size - 1);
char *buffer = xmalloc (current_size);
TEST_COMPARE (pread64 (outfd, buffer, current_size, 0),
current_size - 1);
TEST_VERIFY (memcmp (buffer, random_data + shift, current_size - 1)
== 0);
free (buffer);
if (do_inoff)
{
TEST_COMPARE (inoff, current_size - 1 + shift);
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
}
else
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
if (do_outoff)
{
TEST_COMPARE (outoff, current_size - 1);
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
}
else
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
/* First call copies zero bytes. */
TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
current_size, 0), 0);
/* And the offsets are unchanged. */
if (do_inoff)
{
TEST_COMPARE (inoff, current_size - 1 + shift);
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
}
else
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
if (do_outoff)
{
TEST_COMPARE (outoff, current_size - 1);
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
}
else
TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
}
}
/* A named test function. */
struct test_case
{
const char *name;
void (*func) (void);
bool sizes; /* If true, call the test with different current_size values. */
};
/* The available test cases. */
static struct test_case tests[] =
{
{ "simple_file_copy", simple_file_copy, .sizes = true },
{ "short_copy", short_copy, .sizes = true },
};
static int
do_test (void)
{
for (unsigned char *p = random_data; p < array_end (random_data); ++p)
*p = rand () >> 24;
infd = create_temp_file ("tst-copy_file_range-in-", &infile);
outfd = create_temp_file ("tst-copy_file_range-out-", &outfile);
{
ssize_t ret = copy_file_range (infd, NULL, outfd, NULL, 0, 0);
if (ret != 0)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("copy_file_range is not support on this system");
FAIL_EXIT1 ("copy_file_range probing call: %m");
}
}
xclose (infd);
xclose (outfd);
for (do_inoff = 0; do_inoff < 2; ++do_inoff)
for (do_outoff = 0; do_outoff < 2; ++do_outoff)
for (struct test_case *test = tests; test < array_end (tests); ++test)
for (const int *size = typical_sizes;
size < array_end (typical_sizes); ++size)
{
current_size = *size;
if (test_verbose > 0)
printf ("info: %s do_inoff=%d do_outoff=%d current_size=%d\n",
test->name, do_inoff, do_outoff, current_size);
inoff = 0;
if (do_inoff)
pinoff = &inoff;
else
pinoff = NULL;
outoff = 0;
if (do_outoff)
poutoff = &outoff;
else
poutoff = NULL;
infd = xopen (infile, O_RDWR | O_LARGEFILE, 0);
xftruncate (infd, 0);
outfd = xopen (outfile, O_RDWR | O_LARGEFILE, 0);
xftruncate (outfd, 0);
test->func ();
xclose (infd);
xclose (outfd);
if (!test->sizes)
/* Skip the other sizes unless they have been
requested. */
break;
}
free (infile);
free (outfile);
return 0;
}
#include <support/test-driver.c>
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