1 files changed, 557 insertions, 0 deletions

diff --git a/lib/ext2fs/test_io.c b/lib/ext2fs/test_io.c
new file mode 100644
index 0000000..6843edb
--- /dev/null
+++ b/lib/ext2fs/test_io.c
@@ -0,0 +1,557 @@
+/*
+ * test_io.c --- This is the Test I/O interface.
+ *
+ * Copyright (C) 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#else
+#define PR_GET_DUMPABLE 3
+#endif
+#if (!defined(HAVE_PRCTL) && defined(linux))
+#include <sys/syscall.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+/*
+ * For checking structure magic numbers...
+ */
+
+#define EXT2_CHECK_MAGIC(struct, code) \
+	  if ((struct)->magic != (code)) return (code)
+
+struct test_private_data {
+	int	magic;
+	io_channel real;
+	int flags;
+	FILE *outfile;
+	unsigned long block;
+	int read_abort_count, write_abort_count;
+	void (*read_blk)(unsigned long block, int count, errcode_t err);
+	void (*write_blk)(unsigned long block, int count, errcode_t err);
+	void (*set_blksize)(int blksize, errcode_t err);
+	void (*write_byte)(unsigned long block, int count, errcode_t err);
+	void (*read_blk64)(unsigned long long block, int count, errcode_t err);
+	void (*write_blk64)(unsigned long long block, int count, errcode_t err);
+};
+
+/*
+ * These global variable can be set by the test program as
+ * necessary *before* calling test_open
+ */
+io_manager test_io_backing_manager = 0;
+void (*test_io_cb_read_blk)
+	(unsigned long block, int count, errcode_t err) = 0;
+void (*test_io_cb_write_blk)
+	(unsigned long block, int count, errcode_t err) = 0;
+void (*test_io_cb_read_blk64)
+	(unsigned long long block, int count, errcode_t err) = 0;
+void (*test_io_cb_write_blk64)
+	(unsigned long long block, int count, errcode_t err) = 0;
+void (*test_io_cb_set_blksize)
+	(int blksize, errcode_t err) = 0;
+void (*test_io_cb_write_byte)
+	(unsigned long block, int count, errcode_t err) = 0;
+
+/*
+ * Test flags
+ */
+#define TEST_FLAG_READ			0x01
+#define TEST_FLAG_WRITE			0x02
+#define TEST_FLAG_SET_BLKSIZE		0x04
+#define TEST_FLAG_FLUSH			0x08
+#define TEST_FLAG_DUMP			0x10
+#define TEST_FLAG_SET_OPTION		0x20
+#define TEST_FLAG_DISCARD		0x40
+#define TEST_FLAG_READAHEAD		0x80
+#define TEST_FLAG_ZEROOUT		0x100
+
+static void test_dump_block(io_channel channel,
+			    struct test_private_data *data,
+			    unsigned long block, const void *buf)
+{
+	const unsigned char *cp;
+	FILE *f = data->outfile;
+	int	i;
+	unsigned long	cksum = 0;
+
+	for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
+		cksum += *cp;
+	}
+	fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
+	for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
+		if ((i % 16) == 0)
+			fprintf(f, "%04x: ", i);
+		fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
+	}
+}
+
+/*
+ * Flush data buffers to disk.
+ */
+static errcode_t test_flush(io_channel channel)
+{
+	struct test_private_data	*data;
+	errcode_t			retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *)channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_flush(data->real);
+
+	if (data->flags & TEST_FLAG_FLUSH)
+		fprintf(data->outfile, "Test_io: flush() returned %s\n",
+			retval ? error_message(retval) : "OK");
+
+	return retval;
+}
+
+static void test_abort(io_channel channel, unsigned long block)
+{
+	struct test_private_data *data;
+	FILE *f;
+
+	data = (struct test_private_data *) channel->private_data;
+	f = data->outfile;
+	test_flush(channel);
+
+	fprintf(f, "Aborting due to I/O to block %lu\n", block);
+	fflush(f);
+	abort();
+}
+
+static char *safe_getenv(const char *arg)
+{
+#if !defined(_WIN32)
+	if ((getuid() != geteuid()) || (getgid() != getegid()))
+		return NULL;
+#endif
+#if HAVE_PRCTL
+	if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+		return NULL;
+#else
+#if (defined(linux) && defined(SYS_prctl))
+	if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+		return NULL;
+#endif
+#endif
+
+#if defined(HAVE_SECURE_GETENV)
+	return secure_getenv(arg);
+#elif defined(HAVE___SECURE_GETENV)
+	return __secure_getenv(arg);
+#else
+	return getenv(arg);
+#endif
+}
+
+static errcode_t test_open(const char *name, int flags, io_channel *channel)
+{
+	io_channel	io = NULL;
+	struct test_private_data *data = NULL;
+	errcode_t	retval;
+	char		*value;
+
+	if (name == 0)
+		return EXT2_ET_BAD_DEVICE_NAME;
+	retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
+	if (retval)
+		goto cleanup;
+	memset(io, 0, sizeof(struct struct_io_channel));
+	io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
+	retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
+	if (retval)
+		goto cleanup;
+	io->manager = test_io_manager;
+	retval = ext2fs_get_mem(strlen(name)+1, &io->name);
+	if (retval)
+		goto cleanup;
+
+	strcpy(io->name, name);
+	io->private_data = data;
+	io->block_size = 1024;
+	io->read_error = 0;
+	io->write_error = 0;
+	io->refcount = 1;
+	io->flags = 0;
+
+	memset(data, 0, sizeof(struct test_private_data));
+	data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
+	if (test_io_backing_manager) {
+		retval = test_io_backing_manager->open(name, flags,
+						       &data->real);
+		if (retval)
+			goto cleanup;
+	} else {
+		data->real = 0;
+	}
+	data->read_blk =	test_io_cb_read_blk;
+	data->write_blk =	test_io_cb_write_blk;
+	data->set_blksize =	test_io_cb_set_blksize;
+	data->write_byte =	test_io_cb_write_byte;
+	data->read_blk64 =	test_io_cb_read_blk64;
+	data->write_blk64 =	test_io_cb_write_blk64;
+
+	data->outfile = NULL;
+	if ((value = safe_getenv("TEST_IO_LOGFILE")) != NULL)
+		data->outfile = fopen(value, "w");
+	if (!data->outfile)
+		data->outfile = stderr;
+
+	data->flags = 0;
+	if ((value = safe_getenv("TEST_IO_FLAGS")) != NULL)
+		data->flags = strtoul(value, NULL, 0);
+
+	data->block = 0;
+	if ((value = safe_getenv("TEST_IO_BLOCK")) != NULL)
+		data->block = strtoul(value, NULL, 0);
+
+	data->read_abort_count = 0;
+	if ((value = safe_getenv("TEST_IO_READ_ABORT")) != NULL)
+		data->read_abort_count = strtoul(value, NULL, 0);
+
+	data->write_abort_count = 0;
+	if ((value = safe_getenv("TEST_IO_WRITE_ABORT")) != NULL)
+		data->write_abort_count = strtoul(value, NULL, 0);
+
+	if (data->real) {
+		io->align = data->real->align;
+		if (data->real->flags & CHANNEL_FLAGS_THREADS)
+			io->flags |= CHANNEL_FLAGS_THREADS;
+	}
+
+	*channel = io;
+	return 0;
+
+cleanup:
+	if (io && io->name)
+		ext2fs_free_mem(&io->name);
+	if (io)
+		ext2fs_free_mem(&io);
+	if (data)
+		ext2fs_free_mem(&data);
+	return retval;
+}
+
+static errcode_t test_close(io_channel channel)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (--channel->refcount > 0)
+		return 0;
+
+	if (data->real)
+		retval = io_channel_close(data->real);
+
+	if (data->outfile && data->outfile != stderr)
+		fclose(data->outfile);
+
+	ext2fs_free_mem(&channel->private_data);
+	if (channel->name)
+		ext2fs_free_mem(&channel->name);
+	ext2fs_free_mem(&channel);
+	return retval;
+}
+
+static errcode_t test_set_blksize(io_channel channel, int blksize)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real) {
+		retval = io_channel_set_blksize(data->real, blksize);
+		channel->align = data->real->align;
+	}
+	if (data->set_blksize)
+		data->set_blksize(blksize, retval);
+	if (data->flags & TEST_FLAG_SET_BLKSIZE)
+		fprintf(data->outfile,
+			"Test_io: set_blksize(%d) returned %s\n",
+			blksize, retval ? error_message(retval) : "OK");
+	channel->block_size = blksize;
+	return retval;
+}
+
+
+static errcode_t test_read_blk(io_channel channel, unsigned long block,
+			       int count, void *buf)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_read_blk(data->real, block, count, buf);
+	if (data->read_blk)
+		data->read_blk(block, count, retval);
+	if (data->flags & TEST_FLAG_READ)
+		fprintf(data->outfile,
+			"Test_io: read_blk(%lu, %d) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	if (data->block && data->block == block) {
+		if (data->flags & TEST_FLAG_DUMP)
+			test_dump_block(channel, data, block, buf);
+		if (--data->read_abort_count == 0)
+			test_abort(channel, block);
+	}
+	return retval;
+}
+
+static errcode_t test_write_blk(io_channel channel, unsigned long block,
+			       int count, const void *buf)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_write_blk(data->real, block, count, buf);
+	if (data->write_blk)
+		data->write_blk(block, count, retval);
+	if (data->flags & TEST_FLAG_WRITE)
+		fprintf(data->outfile,
+			"Test_io: write_blk(%lu, %d) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	if (data->block && data->block == block) {
+		if (data->flags & TEST_FLAG_DUMP)
+			test_dump_block(channel, data, block, buf);
+		if (--data->write_abort_count == 0)
+			test_abort(channel, block);
+	}
+	return retval;
+}
+
+static errcode_t test_read_blk64(io_channel channel, unsigned long long block,
+			       int count, void *buf)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_read_blk64(data->real, block, count, buf);
+	if (data->read_blk64)
+		data->read_blk64(block, count, retval);
+	if (data->flags & TEST_FLAG_READ)
+		fprintf(data->outfile,
+			"Test_io: read_blk64(%llu, %d) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	if (data->block && data->block == block) {
+		if (data->flags & TEST_FLAG_DUMP)
+			test_dump_block(channel, data, block, buf);
+		if (--data->read_abort_count == 0)
+			test_abort(channel, block);
+	}
+	return retval;
+}
+
+static errcode_t test_write_blk64(io_channel channel, unsigned long long block,
+			       int count, const void *buf)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_write_blk64(data->real, block, count, buf);
+	if (data->write_blk64)
+		data->write_blk64(block, count, retval);
+	if (data->flags & TEST_FLAG_WRITE)
+		fprintf(data->outfile,
+			"Test_io: write_blk64(%llu, %d) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	if (data->block && data->block == block) {
+		if (data->flags & TEST_FLAG_DUMP)
+			test_dump_block(channel, data, block, buf);
+		if (--data->write_abort_count == 0)
+			test_abort(channel, block);
+	}
+	return retval;
+}
+
+static errcode_t test_write_byte(io_channel channel, unsigned long offset,
+			       int count, const void *buf)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real && data->real->manager->write_byte)
+		retval = io_channel_write_byte(data->real, offset, count, buf);
+	if (data->write_byte)
+		data->write_byte(offset, count, retval);
+	if (data->flags & TEST_FLAG_WRITE)
+		fprintf(data->outfile,
+			"Test_io: write_byte(%lu, %d) returned %s\n",
+			offset, count, retval ? error_message(retval) : "OK");
+	return retval;
+}
+
+static errcode_t test_set_option(io_channel channel, const char *option,
+				 const char *arg)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+
+	if (data->flags & TEST_FLAG_SET_OPTION)
+		fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
+			option, arg);
+	if (data->real && data->real->manager->set_option) {
+		retval = (data->real->manager->set_option)(data->real,
+							   option, arg);
+		if (data->flags & TEST_FLAG_SET_OPTION)
+			fprintf(data->outfile, "returned %s\n",
+				retval ? error_message(retval) : "OK");
+	} else {
+		if (data->flags & TEST_FLAG_SET_OPTION)
+			fprintf(data->outfile, "not implemented\n");
+	}
+	return retval;
+}
+
+static errcode_t test_get_stats(io_channel channel, io_stats *stats)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real && data->real->manager->get_stats) {
+		retval = (data->real->manager->get_stats)(data->real, stats);
+	}
+	return retval;
+}
+
+static errcode_t test_discard(io_channel channel, unsigned long long block,
+			      unsigned long long count)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_discard(data->real, block, count);
+	if (data->flags & TEST_FLAG_DISCARD)
+		fprintf(data->outfile,
+			"Test_io: discard(%llu, %llu) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	return retval;
+}
+
+static errcode_t test_cache_readahead(io_channel channel,
+				      unsigned long long block,
+				      unsigned long long count)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_cache_readahead(data->real, block, count);
+	if (data->flags & TEST_FLAG_READAHEAD)
+		fprintf(data->outfile,
+			"Test_io: readahead(%llu, %llu) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	return retval;
+}
+
+static errcode_t test_zeroout(io_channel channel, unsigned long long block,
+			      unsigned long long count)
+{
+	struct test_private_data *data;
+	errcode_t	retval = 0;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct test_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_zeroout(data->real, block, count);
+	if (data->flags & TEST_FLAG_ZEROOUT)
+		fprintf(data->outfile,
+			"Test_io: zeroout(%llu, %llu) returned %s\n",
+			block, count, retval ? error_message(retval) : "OK");
+	return retval;
+}
+
+static struct struct_io_manager struct_test_manager = {
+	.magic		= EXT2_ET_MAGIC_IO_MANAGER,
+	.name		= "Test I/O Manager",
+	.open		= test_open,
+	.close		= test_close,
+	.set_blksize	= test_set_blksize,
+	.read_blk	= test_read_blk,
+	.write_blk	= test_write_blk,
+	.flush		= test_flush,
+	.write_byte	= test_write_byte,
+	.set_option	= test_set_option,
+	.get_stats	= test_get_stats,
+	.read_blk64	= test_read_blk64,
+	.write_blk64	= test_write_blk64,
+	.discard	= test_discard,
+	.cache_readahead	= test_cache_readahead,
+	.zeroout	= test_zeroout,
+};
+
+io_manager test_io_manager = &struct_test_manager;