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/* Test for rewinddir, using FUSE.
Copyright (C) 2024 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
<https://www.gnu.org/licenses/>. */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/fuse.h>
#include <support/readdir.h>
#include <support/support.h>
#include <support/xdirent.h>
/* Return the file name at the indicated directory offset. */
static char *
name_at_offset (unsigned int offset)
{
if (offset <= 1)
return xstrdup (".." + !offset); /* "." or "..". */
else
/* Pad the name with a lot of zeros, so that the dirent buffer gets
filled more quickly. */
return xasprintf ("file%0240u", offset);
}
/* This many directory entries, including "." and "..". */
enum { directory_entries = 200 };
/* Add the directory entry at OFFSET to the stream D. */
static uint64_t
add_directory_entry (struct support_fuse_dirstream *d, uint64_t offset)
{
if (offset >= directory_entries)
return 0;
char *name = name_at_offset (offset);
uint64_t ino = 1000 + offset; /* Arbitrary value, distinct from 1. */
uint32_t type = DT_REG;
if (offset <= 1)
{
type = DT_DIR;
ino = 1;
}
++offset;
bool added = support_fuse_dirstream_add (d, ino, offset, type, name);
free (name);
if (added)
return offset;
else
return 0;
}
/* Set to true if getdents64 should produce only one entry. */
static bool one_entry_per_getdents64;
static void
fuse_thread (struct support_fuse *f, void *closure)
{
struct fuse_in_header *inh;
while ((inh = support_fuse_next (f)) != NULL)
{
if (support_fuse_handle_mountpoint (f)
|| (inh->nodeid == 1 && support_fuse_handle_directory (f)))
continue;
switch (inh->opcode)
{
case FUSE_READDIR:
if (inh->nodeid == 1)
{
uint64_t offset = support_fuse_cast (READ, inh)->offset;
struct support_fuse_dirstream *d
= support_fuse_prepare_readdir (f);
while (true)
{
offset = add_directory_entry (d, offset);
if (offset == 0 || one_entry_per_getdents64)
break;
}
support_fuse_reply_prepared (f);
}
else
support_fuse_reply_error (f, EIO);
break;
default:
FAIL ("unexpected event %s", support_fuse_opcode (inh->opcode));
support_fuse_reply_error (f, EIO);
}
}
}
/* Lists the entire directory from start to end. */
static void
verify_directory (DIR *dir, enum support_readdir_op op)
{
struct support_dirent e = { 0, };
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, ".");
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, "..");
for (int i = 2; i < directory_entries; ++i)
{
char *expected = name_at_offset (i);
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, expected);
free (expected);
}
TEST_VERIFY (!support_readdir (dir, op, &e));
free (e.d_name);
}
/* Run tests with rewinding after ENTRIES readdir calls. */
static void
rewind_after (unsigned int rewind_at)
{
for (enum support_readdir_op op = 0; op <= support_readdir_op_last (); ++op)
{
printf ("info: testing %s (rewind_at=%u)\n",
support_readdir_function (op), rewind_at);
struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
DIR *dir = xopendir (support_fuse_mountpoint (f));
struct support_dirent e = { 0, };
switch (rewind_at)
{
case 0:
break;
case 1:
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, ".");
break;
default:
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, ".");
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, "..");
for (int i = 2; i < directory_entries; ++i)
{
if (i == rewind_at)
break;
char *expected = name_at_offset (i);
TEST_VERIFY (support_readdir (dir, op, &e));
TEST_COMPARE_STRING (e.d_name, expected);
free (expected);
}
break;
}
errno = 0;
rewinddir (dir);
TEST_COMPARE (errno, 0);
verify_directory (dir, op);
free (e.d_name);
xclosedir (dir);
support_fuse_unmount (f);
}
}
static int
do_test (void)
{
support_fuse_init ();
/* One pass without rewinding to verify that the generated directory
content matches expectations. */
{
struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
DIR *dir = xopendir (support_fuse_mountpoint (f));
verify_directory (dir, SUPPORT_READDIR64);
xclosedir (dir);
support_fuse_unmount (f);
}
for (int do_unbuffered = 0; do_unbuffered < 2; ++do_unbuffered)
{
one_entry_per_getdents64 = do_unbuffered;
for (int i = 0; i < 20; ++i)
rewind_after (i);
rewind_after (50);
rewind_after (100);
rewind_after (150);
rewind_after (180);
rewind_after (199);
}
return 0;
}
#include <support/test-driver.c>
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