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Diffstat (limited to 'io/tst-copy_file_range.c')
| -rw-r--r-- | io/tst-copy_file_range.c | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/io/tst-copy_file_range.c b/io/tst-copy_file_range.c new file mode 100644 index 0000000000..d8f4e8ac04 --- /dev/null +++ b/io/tst-copy_file_range.c @@ -0,0 +1,833 @@ +/* Tests for copy_file_range. + Copyright (C) 2017 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 <libgen.h> +#include <poll.h> +#include <sched.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <support/check.h> +#include <support/namespace.h> +#include <support/support.h> +#include <support/temp_file.h> +#include <support/test-driver.h> +#include <support/xunistd.h> +#include <sys/mount.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; + +/* Like the above, but on a different file system. xdevfile can be + NULL if no suitable file system has been found. */ +static char *xdevfile; + +/* 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. The selection + takes into account that the fallback implementation uses an + internal buffer of 8192 bytes. */ +enum { maximum_size = 99999 }; +static const int typical_sizes[] = + { 0, 1, 2, 3, 1024, 2048, 4096, 8191, 8192, 8193, 16383, 16384, 16385, + 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; + +/* Maximum writable file offset. Updated by find_maximum_offset + below. */ +static off64_t maximum_offset; + +/* Error code when crossing the offset. */ +static int maximum_offset_errno; + +/* If true: Writes which cross the limit will fail. If false: Writes + which cross the limit will result in a partial write. */ +static bool maximum_offset_hard_limit; + +/* Fills maximum_offset etc. above. Truncates outfd as a side + effect. */ +static void +find_maximum_offset (void) +{ + xftruncate (outfd, 0); + if (maximum_offset != 0) + return; + + uint64_t upper = -1; + upper >>= 1; /* Maximum of off64_t. */ + TEST_VERIFY ((off64_t) upper > 0); + TEST_VERIFY ((off64_t) (upper + 1) < 0); + if (lseek64 (outfd, upper, SEEK_SET) >= 0) + { + if (write (outfd, "", 1) == 1) + FAIL_EXIT1 ("created a file larger than the off64_t range"); + } + + uint64_t lower = 1024 * 1024; /* A reasonable minimum file size. */ + /* Loop invariant: writing at lower succeeds, writing at upper fails. */ + while (lower + 1 < upper) + { + uint64_t middle = (lower + upper) / 2; + if (test_verbose > 0) + printf ("info: %s: remaining test range %" PRIu64 " .. %" PRIu64 + ", probe at %" PRIu64 "\n", __func__, lower, upper, middle); + xftruncate (outfd, 0); + if (lseek64 (outfd, middle, SEEK_SET) >= 0 + && write (outfd, "", 1) == 1) + lower = middle; + else + upper = middle; + } + TEST_VERIFY (lower + 1 == upper); + maximum_offset = lower; + printf ("info: maximum writable file offset: %" PRIu64 " (%" PRIx64 ")\n", + lower, lower); + + /* Check that writing at the valid offset actually works. */ + xftruncate (outfd, 0); + xlseek (outfd, lower, SEEK_SET); + TEST_COMPARE (write (outfd, "", 1), 1); + + /* Cross the boundary with a two-byte write. This can either result + in a short write, or a failure. */ + xlseek (outfd, lower, SEEK_SET); + ssize_t ret = write (outfd, " ", 2); + if (ret < 0) + { + maximum_offset_errno = errno; + maximum_offset_hard_limit = true; + } + else + maximum_offset_hard_limit = false; + + /* Check that writing at the next offset actually fails. This also + obtains the expected errno value. */ + xftruncate (outfd, 0); + const char *action; + if (lseek64 (outfd, lower + 1, SEEK_SET) != 0) + { + if (write (outfd, "", 1) != -1) + FAIL_EXIT1 ("write to impossible offset %" PRIu64 " succeeded", + lower + 1); + action = "writing"; + int errno_copy = errno; + if (maximum_offset_hard_limit) + TEST_COMPARE (errno_copy, maximum_offset_errno); + else + maximum_offset_errno = errno_copy; + } + else + { + action = "seeking"; + maximum_offset_errno = errno; + } + printf ("info: %s out of range fails with %m (%d)\n", + action, maximum_offset_errno); + + xftruncate (outfd, 0); + xlseek (outfd, 0, SEEK_SET); +} + +/* 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 reading from a pipe willfails. */ +static void +pipe_as_source (void) +{ + int pipefds[2]; + xpipe (pipefds); + + for (int length = 0; length < 2; ++length) + { + if (test_verbose > 0) + printf ("info: %s: length=%d\n", __func__, length); + + /* Make sure that there is something to copy in the pipe. */ + xwrite (pipefds[1], "@", 1); + + TEST_COMPARE (copy_file_range (pipefds[0], pinoff, outfd, poutoff, + length, 0), -1); + /* Linux 4.10 and later return EINVAL. Older kernels return + EXDEV. */ + TEST_VERIFY (errno == EINVAL || errno == EXDEV); + TEST_COMPARE (inoff, 0); + TEST_COMPARE (outoff, 0); + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0); + + /* Make sure that nothing was read. */ + char buf = 'A'; + TEST_COMPARE (read (pipefds[0], &buf, 1), 1); + TEST_COMPARE (buf, '@'); + } + + xclose (pipefds[0]); + xclose (pipefds[1]); +} + +/* Test that writing to a pipe fails. */ +static void +pipe_as_destination (void) +{ + /* Make sure that there is something to read in the input file. */ + xwrite (infd, "abc", 3); + xlseek (infd, 0, SEEK_SET); + + int pipefds[2]; + xpipe (pipefds); + + for (int length = 0; length < 2; ++length) + { + if (test_verbose > 0) + printf ("info: %s: length=%d\n", __func__, length); + + TEST_COMPARE (copy_file_range (infd, pinoff, pipefds[1], poutoff, + length, 0), -1); + /* Linux 4.10 and later return EINVAL. Older kernels return + EXDEV. */ + TEST_VERIFY (errno == EINVAL || errno == EXDEV); + TEST_COMPARE (inoff, 0); + TEST_COMPARE (outoff, 0); + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0); + + /* Make sure that nothing was written. */ + struct pollfd pollfd = { .fd = pipefds[0], .events = POLLIN, }; + TEST_COMPARE (poll (&pollfd, 1, 0), 0); + } + + xclose (pipefds[0]); + xclose (pipefds[1]); +} + +/* Test a write failure after (potentially) writing some bytes. + Failure occurs near the start of the buffer. */ +static void +delayed_write_failure_beginning (void) +{ + /* We need to write something to provoke the error. */ + if (current_size == 0) + return; + xwrite (infd, random_data, sizeof (random_data)); + xlseek (infd, 0, SEEK_SET); + + /* Write failure near the start. The actual error code varies among + file systems. */ + find_maximum_offset (); + off64_t where = maximum_offset; + + if (current_size == 1) + ++where; + outoff = where; + if (do_outoff) + xlseek (outfd, 1, SEEK_SET); + else + xlseek (outfd, where, SEEK_SET); + if (maximum_offset_hard_limit || where > maximum_offset) + { + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff, + sizeof (random_data), 0), -1); + TEST_COMPARE (errno, maximum_offset_errno); + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0); + TEST_COMPARE (inoff, 0); + if (do_outoff) + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 1); + else + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), where); + TEST_COMPARE (outoff, where); + struct stat64 st; + xfstat (outfd, &st); + TEST_COMPARE (st.st_size, 0); + } + else + { + /* The offset is not a hard limit. This means we write one + byte. */ + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff, + sizeof (random_data), 0), 1); + if (do_inoff) + { + TEST_COMPARE (inoff, 1); + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0); + } + else + { + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1); + TEST_COMPARE (inoff, 0); + } + if (do_outoff) + { + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 1); + TEST_COMPARE (outoff, where + 1); + } + else + { + TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), where + 1); + TEST_COMPARE (outoff, where); + } + struct stat64 st; + xfstat (outfd, &st); + TEST_COMPARE (st.st_size, where + 1); + } +} + +/* Test a write failure after (potentially) writing some bytes. + Failure occurs near the end of the buffer. */ +static void +delayed_write_failure_end (void) +{ + if (current_size <= 1) + /* This would be same as the first test because there is not + enough data to write to make a difference. */ + return; + xwrite (infd, random_data, sizeof (random_data)); + xlseek (infd, 0, SEEK_SET); + + find_maximum_offset (); + off64_t where = maximum_offset - current_size + 1; + if (current_size == sizeof (random_data)) + /* Otherwise we do not reach the non-writable byte. */ + ++where; + outoff = where; + if (do_outoff) + xlseek (outfd, 1, SEEK_SET); + else + xlseek (outfd, where, SEEK_SET); + ssize_t ret = copy_file_range (infd, pinoff, outfd, poutoff, + sizeof (random_data), 0); + if (ret < 0) + { + TEST_COMPARE (ret, -1); + TEST_COMPARE (errno, maximum_offset_errno); + struct stat64 st; + xfstat (outfd, &st); + TEST_COMPARE (st.st_size, 0); + } + else + { + /* The first copy succeeded. This happens in the emulation + because the internal buffer of limited size does not + necessarily cross the off64_t boundary on the first write + operation. */ + if (test_verbose > 0) + printf ("info: copy_file_range (%zu) returned %zd\n", + sizeof (random_data), ret); + TEST_VERIFY (ret > 0); + TEST_VERIFY (ret < maximum_size); + struct stat64 st; + xfstat (outfd, &st); + TEST_COMPARE (st.st_size, where + ret); + if (do_inoff) + { + TEST_COMPARE (inoff, ret); + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0); + } + else + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), ret); + + char *buffer = xmalloc (ret); + TEST_COMPARE (pread64 (outfd, buffer, ret, where), ret); + TEST_VERIFY (memcmp (buffer, random_data, ret) == 0); + free (buffer); + + /* The second copy fails. */ + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff, + sizeof (random_data), 0), -1); + TEST_COMPARE (errno, maximum_offset_errno); + } +} + +/* Test a write failure across devices. */ +static void +cross_device_failure (void) +{ + if (xdevfile == NULL) + /* Subtest not supported due to missing cross-device file. */ + return; + + /* We need something to write. */ + xwrite (infd, random_data, sizeof (random_data)); + xlseek (infd, 0, SEEK_SET); + + int xdevfd = xopen (xdevfile, O_RDWR | O_LARGEFILE, 0); + TEST_COMPARE (copy_file_range (infd, pinoff, xdevfd, poutoff, + current_size, 0), -1); + TEST_COMPARE (errno, EXDEV); + TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 0); + struct stat64 st; + xfstat (xdevfd, &st); + TEST_COMPARE (st.st_size, 0); + + xclose (xdevfd); +} + +/* Try to exercise ENOSPC behavior with a tempfs file system (so that + we do not have to fill up a regular file system to get the error). + This function runs in a subprocess, so that we do not change the + mount namespace of the actual test process. */ +static void +enospc_failure_1 (void *closure) +{ +#ifdef CLONE_NEWNS + support_become_root (); + + /* Make sure that we do not alter the file system mounts of the + parents. */ + if (! support_enter_mount_namespace ()) + { + printf ("warning: ENOSPC test skipped\n"); + return; + } + + char *mountpoint = closure; + if (mount ("none", mountpoint, "tmpfs", MS_NODEV | MS_NOEXEC, + "size=500k") != 0) + { + printf ("warning: could not mount tmpfs at %s: %m\n", mountpoint); + return; + } + + /* The source file must reside on the same file system. */ + char *intmpfsfile = xasprintf ("%s/%s", mountpoint, "in"); + int intmpfsfd = xopen (intmpfsfile, O_RDWR | O_CREAT | O_LARGEFILE, 0600); + xwrite (intmpfsfd, random_data, sizeof (random_data)); + xlseek (intmpfsfd, 1, SEEK_SET); + inoff = 1; + + char *outtmpfsfile = xasprintf ("%s/%s", mountpoint, "out"); + int outtmpfsfd = xopen (outtmpfsfile, O_RDWR | O_CREAT | O_LARGEFILE, 0600); + + /* Fill the file with data until ENOSPC is reached. */ + while (true) + { + ssize_t ret = write (outtmpfsfd, random_data, sizeof (random_data)); + if (ret < 0 && errno != ENOSPC) + FAIL_EXIT1 ("write to %s: %m", outtmpfsfile); + if (ret < sizeof (random_data)) + break; + } + TEST_COMPARE (write (outtmpfsfd, "", 1), -1); + TEST_COMPARE (errno, ENOSPC); + off64_t maxsize = xlseek (outtmpfsfd, 0, SEEK_CUR); + TEST_VERIFY_EXIT (maxsize > sizeof (random_data)); + + /* Constructed the expected file contents. */ + char *expected = xmalloc (maxsize); + TEST_COMPARE (pread64 (outtmpfsfd, expected, maxsize, 0), maxsize); + /* Go back a little, so some bytes can be written. */ + enum { offset = 20000 }; + TEST_VERIFY_EXIT (offset < maxsize); + TEST_VERIFY_EXIT (offset < sizeof (random_data)); + memcpy (expected + maxsize - offset, random_data + 1, offset); + + if (do_outoff) + { + outoff = maxsize - offset; + xlseek (outtmpfsfd, 2, SEEK_SET); + } + else + xlseek (outtmpfsfd, -offset, SEEK_CUR); + + /* First call is expected to succeed because we made room for some + bytes. */ + TEST_COMPARE (copy_file_range (intmpfsfd, pinoff, outtmpfsfd, poutoff, + maximum_size, 0), offset); + if (do_inoff) + { + TEST_COMPARE (inoff, 1 + offset); + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1); + } + else + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1 + offset); + if (do_outoff) + { + TEST_COMPARE (outoff, maxsize); + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), 2); + } + else + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), maxsize); + struct stat64 st; + xfstat (outtmpfsfd, &st); + TEST_COMPARE (st.st_size, maxsize); + char *actual = xmalloc (st.st_size); + TEST_COMPARE (pread64 (outtmpfsfd, actual, st.st_size, 0), st.st_size); + TEST_VERIFY (memcmp (expected, actual, maxsize) == 0); + + /* Second call should fail with ENOSPC. */ + TEST_COMPARE (copy_file_range (intmpfsfd, pinoff, outtmpfsfd, poutoff, + maximum_size, 0), -1); + TEST_COMPARE (errno, ENOSPC); + + /* Offsets should be unchanged. */ + if (do_inoff) + { + TEST_COMPARE (inoff, 1 + offset); + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1); + } + else + TEST_COMPARE (xlseek (intmpfsfd, 0, SEEK_CUR), 1 + offset); + if (do_outoff) + { + TEST_COMPARE (outoff, maxsize); + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), 2); + } + else + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_CUR), maxsize); + TEST_COMPARE (xlseek (outtmpfsfd, 0, SEEK_END), maxsize); + TEST_COMPARE (pread64 (outtmpfsfd, actual, maxsize, 0), maxsize); + TEST_VERIFY (memcmp (expected, actual, maxsize) == 0); + + free (actual); + free (expected); + + xclose (intmpfsfd); + xclose (outtmpfsfd); + free (intmpfsfile); + free (outtmpfsfile); + +#else /* !CLONE_NEWNS */ + puts ("warning: ENOSPC test skipped (no mount namespaces)"); +#endif +} + +/* Call enospc_failure_1 in a subprocess. */ +static void +enospc_failure (void) +{ + char *mountpoint + = support_create_temp_directory ("tst-copy_file_range-enospc-"); + support_isolate_in_subprocess (enospc_failure_1, mountpoint); + free (mountpoint); +} + +/* The target file descriptor must have O_APPEND enabled. */ +static void +oappend_failure (void) +{ + /* Add data, to make sure we do not fail because there is + insufficient input data. */ + xwrite (infd, random_data, current_size); + xlseek (infd, 0, SEEK_SET); + + xclose (outfd); + outfd = xopen (outfile, O_RDWR | O_APPEND, 0); + TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff, + current_size, 0), -1); + TEST_COMPARE (errno, EBADF); +} + +/* 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 }, + { "pipe_as_source", pipe_as_source, }, + { "pipe_as_destination", pipe_as_destination, }, + { "delayed_write_failure_beginning", delayed_write_failure_beginning, + .sizes = true }, + { "delayed_write_failure_end", delayed_write_failure_end, .sizes = true }, + { "cross_device_failure", cross_device_failure, .sizes = true }, + { "enospc_failure", enospc_failure, }, + { "oappend_failure", oappend_failure, .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); + xclose (create_temp_file ("tst-copy_file_range-out-", &outfile)); + + /* Try to find a different directory from the default input/output + file. */ + { + struct stat64 instat; + xfstat (infd, &instat); + static const char *const candidates[] = + { NULL, "/var/tmp", "/dev/shm" }; + for (const char *const *c = candidates; c < array_end (candidates); ++c) + { + const char *path = *c; + char *to_free = NULL; + if (path == NULL) + { + to_free = xreadlink ("/proc/self/exe"); + path = dirname (to_free); + } + + struct stat64 cstat; + xstat (path, &cstat); + if (cstat.st_dev == instat.st_dev) + { + free (to_free); + continue; + } + + printf ("info: using alternate temporary files directory: %s\n", path); + xdevfile = xasprintf ("%s/tst-copy_file_range-xdev-XXXXXX", path); + free (to_free); + break; + } + if (xdevfile != NULL) + { + int xdevfd = mkstemp (xdevfile); + if (xdevfd < 0) + FAIL_EXIT1 ("mkstemp (\"%s\"): %m", xdevfile); + struct stat64 xdevst; + xfstat (xdevfd, &xdevst); + TEST_VERIFY (xdevst.st_dev != instat.st_dev); + add_temp_file (xdevfile); + xclose (xdevfd); + } + else + puts ("warning: no alternate directory on different file system found"); + } + xclose (infd); + + 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); + free (xdevfile); + + return 0; +} + +#include <support/test-driver.c> |