1 files changed, 0 insertions, 703 deletions

diff --git a/e2fsprogs/ext2fs/unix_io.c b/e2fsprogs/ext2fs/unix_io.c
deleted file mode 100644
index 474f073..0000000
--- a/e2fsprogs/ext2fs/unix_io.c
+++ /dev/null
@@ -1,703 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * unix_io.c --- This is the Unix (well, really POSIX) implementation
- *	of the I/O manager.
- *
- * Implements a one-block write-through cache.
- *
- * Includes support for Windows NT support under Cygwin.
- *
- * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- *	2002 by Theodore Ts'o.
- *
- * %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
- * %End-Header%
- */
-
-#include <stdio.h>
-#include <string.h>
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#if HAVE_ERRNO_H
-#include <errno.h>
-#endif
-#include <fcntl.h>
-#include <time.h>
-#ifdef __linux__
-#include <sys/utsname.h>
-#endif
-#if HAVE_SYS_STAT_H
-#include <sys/stat.h>
-#endif
-#if HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#include <sys/resource.h>
-
-#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 unix_cache {
-	char		*buf;
-	unsigned long	block;
-	int		access_time;
-	unsigned	dirty:1;
-	unsigned	in_use:1;
-};
-
-#define CACHE_SIZE 8
-#define WRITE_DIRECT_SIZE 4	/* Must be smaller than CACHE_SIZE */
-#define READ_DIRECT_SIZE 4	/* Should be smaller than CACHE_SIZE */
-
-struct unix_private_data {
-	int	magic;
-	int	dev;
-	int	flags;
-	int	access_time;
-	ext2_loff_t offset;
-	struct unix_cache cache[CACHE_SIZE];
-};
-
-static errcode_t unix_open(const char *name, int flags, io_channel *channel);
-static errcode_t unix_close(io_channel channel);
-static errcode_t unix_set_blksize(io_channel channel, int blksize);
-static errcode_t unix_read_blk(io_channel channel, unsigned long block,
-			       int count, void *data);
-static errcode_t unix_write_blk(io_channel channel, unsigned long block,
-				int count, const void *data);
-static errcode_t unix_flush(io_channel channel);
-static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
-				int size, const void *data);
-static errcode_t unix_set_option(io_channel channel, const char *option,
-				 const char *arg);
-
-static void reuse_cache(io_channel channel, struct unix_private_data *data,
-		 struct unix_cache *cache, unsigned long block);
-
-/* __FreeBSD_kernel__ is defined by GNU/kFreeBSD - the FreeBSD kernel
- * does not know buffered block devices - everything is raw. */
-#if defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-#define NEED_BOUNCE_BUFFER
-#else
-#undef NEED_BOUNCE_BUFFER
-#endif
-
-static struct struct_io_manager struct_unix_manager = {
-	EXT2_ET_MAGIC_IO_MANAGER,
-	"Unix I/O Manager",
-	unix_open,
-	unix_close,
-	unix_set_blksize,
-	unix_read_blk,
-	unix_write_blk,
-	unix_flush,
-#ifdef NEED_BOUNCE_BUFFER
-	0,
-#else
-	unix_write_byte,
-#endif
-	unix_set_option
-};
-
-io_manager unix_io_manager = &struct_unix_manager;
-
-/*
- * Here are the raw I/O functions
- */
-#ifndef NEED_BOUNCE_BUFFER
-static errcode_t raw_read_blk(io_channel channel,
-			      struct unix_private_data *data,
-			      unsigned long block,
-			      int count, void *buf)
-{
-	errcode_t	retval;
-	ssize_t		size;
-	ext2_loff_t	location;
-	int		actual = 0;
-
-	size = (count < 0) ? -count : count * channel->block_size;
-	location = ((ext2_loff_t) block * channel->block_size) + data->offset;
-	if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
-		retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
-		goto error_out;
-	}
-	actual = read(data->dev, buf, size);
-	if (actual != size) {
-		if (actual < 0)
-			actual = 0;
-		retval = EXT2_ET_SHORT_READ;
-		goto error_out;
-	}
-	return 0;
-
-error_out:
-	memset((char *) buf+actual, 0, size-actual);
-	if (channel->read_error)
-		retval = (channel->read_error)(channel, block, count, buf,
-					       size, actual, retval);
-	return retval;
-}
-#else /* NEED_BOUNCE_BUFFER */
-/*
- * Windows and FreeBSD block devices only allow sector alignment IO in offset and size
- */
-static errcode_t raw_read_blk(io_channel channel,
-			      struct unix_private_data *data,
-			      unsigned long block,
-			      int count, void *buf)
-{
-	errcode_t	retval;
-	size_t		size, alignsize, fragment;
-	ext2_loff_t	location;
-	int		total = 0, actual;
-#define BLOCKALIGN 512
-	char		sector[BLOCKALIGN];
-
-	size = (count < 0) ? -count : count * channel->block_size;
-	location = ((ext2_loff_t) block * channel->block_size) + data->offset;
-#ifdef DEBUG
-	printf("count=%d, size=%d, block=%d, blk_size=%d, location=%lx\n",
-			count, size, block, channel->block_size, location);
-#endif
-	if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
-		retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
-		goto error_out;
-	}
-	fragment = size % BLOCKALIGN;
-	alignsize = size - fragment;
-	if (alignsize) {
-		actual = read(data->dev, buf, alignsize);
-		if (actual != alignsize)
-			goto short_read;
-	}
-	if (fragment) {
-		actual = read(data->dev, sector, BLOCKALIGN);
-		if (actual != BLOCKALIGN)
-			goto short_read;
-		memcpy(buf+alignsize, sector, fragment);
-	}
-	return 0;
-
-short_read:
-	if (actual>0)
-		total += actual;
-	retval = EXT2_ET_SHORT_READ;
-
-error_out:
-	memset((char *) buf+total, 0, size-actual);
-	if (channel->read_error)
-		retval = (channel->read_error)(channel, block, count, buf,
-					       size, actual, retval);
-	return retval;
-}
-#endif
-
-static errcode_t raw_write_blk(io_channel channel,
-			       struct unix_private_data *data,
-			       unsigned long block,
-			       int count, const void *buf)
-{
-	ssize_t		size;
-	ext2_loff_t	location;
-	int		actual = 0;
-	errcode_t	retval;
-
-	if (count == 1)
-		size = channel->block_size;
-	else {
-		if (count < 0)
-			size = -count;
-		else
-			size = count * channel->block_size;
-	}
-
-	location = ((ext2_loff_t) block * channel->block_size) + data->offset;
-	if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
-		retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
-		goto error_out;
-	}
-
-	actual = write(data->dev, buf, size);
-	if (actual != size) {
-		retval = EXT2_ET_SHORT_WRITE;
-		goto error_out;
-	}
-	return 0;
-
-error_out:
-	if (channel->write_error)
-		retval = (channel->write_error)(channel, block, count, buf,
-						size, actual, retval);
-	return retval;
-}
-
-
-/*
- * Here we implement the cache functions
- */
-
-/* Allocate the cache buffers */
-static errcode_t alloc_cache(io_channel channel,
-			     struct unix_private_data *data)
-{
-	errcode_t		retval;
-	struct unix_cache	*cache;
-	int			i;
-
-	data->access_time = 0;
-	for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
-		cache->block = 0;
-		cache->access_time = 0;
-		cache->dirty = 0;
-		cache->in_use = 0;
-		if ((retval = ext2fs_get_mem(channel->block_size,
-					     &cache->buf)))
-			return retval;
-	}
-	return 0;
-}
-
-/* Free the cache buffers */
-static void free_cache(struct unix_private_data *data)
-{
-	struct unix_cache	*cache;
-	int			i;
-
-	data->access_time = 0;
-	for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
-		cache->block = 0;
-		cache->access_time = 0;
-		cache->dirty = 0;
-		cache->in_use = 0;
-		ext2fs_free_mem(&cache->buf);
-		cache->buf = 0;
-	}
-}
-
-#ifndef NO_IO_CACHE
-/*
- * Try to find a block in the cache.  If the block is not found, and
- * eldest is a non-zero pointer, then fill in eldest with the cache
- * entry to that should be reused.
- */
-static struct unix_cache *find_cached_block(struct unix_private_data *data,
-					    unsigned long block,
-					    struct unix_cache **eldest)
-{
-	struct unix_cache	*cache, *unused_cache, *oldest_cache;
-	int			i;
-
-	unused_cache = oldest_cache = 0;
-	for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
-		if (!cache->in_use) {
-			if (!unused_cache)
-				unused_cache = cache;
-			continue;
-		}
-		if (cache->block == block) {
-			cache->access_time = ++data->access_time;
-			return cache;
-		}
-		if (!oldest_cache ||
-		    (cache->access_time < oldest_cache->access_time))
-			oldest_cache = cache;
-	}
-	if (eldest)
-		*eldest = (unused_cache) ? unused_cache : oldest_cache;
-	return 0;
-}
-
-/*
- * Reuse a particular cache entry for another block.
- */
-static void reuse_cache(io_channel channel, struct unix_private_data *data,
-		 struct unix_cache *cache, unsigned long block)
-{
-	if (cache->dirty && cache->in_use)
-		raw_write_blk(channel, data, cache->block, 1, cache->buf);
-
-	cache->in_use = 1;
-	cache->dirty = 0;
-	cache->block = block;
-	cache->access_time = ++data->access_time;
-}
-
-/*
- * Flush all of the blocks in the cache
- */
-static errcode_t flush_cached_blocks(io_channel channel,
-				     struct unix_private_data *data,
-				     int invalidate)
-
-{
-	struct unix_cache	*cache;
-	errcode_t		retval, retval2;
-	int			i;
-
-	retval2 = 0;
-	for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
-		if (!cache->in_use)
-			continue;
-
-		if (invalidate)
-			cache->in_use = 0;
-
-		if (!cache->dirty)
-			continue;
-
-		retval = raw_write_blk(channel, data,
-				       cache->block, 1, cache->buf);
-		if (retval)
-			retval2 = retval;
-		else
-			cache->dirty = 0;
-	}
-	return retval2;
-}
-#endif /* NO_IO_CACHE */
-
-static errcode_t unix_open(const char *name, int flags, io_channel *channel)
-{
-	io_channel	io = NULL;
-	struct unix_private_data *data = NULL;
-	errcode_t	retval;
-	int		open_flags;
-	struct stat	st;
-#ifdef __linux__
-	struct		utsname ut;
-#endif
-
-	if (name == 0)
-		return EXT2_ET_BAD_DEVICE_NAME;
-	retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
-	if (retval)
-		return retval;
-	memset(io, 0, sizeof(struct struct_io_channel));
-	io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
-	retval = ext2fs_get_mem(sizeof(struct unix_private_data), &data);
-	if (retval)
-		goto cleanup;
-
-	io->manager = unix_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;
-
-	memset(data, 0, sizeof(struct unix_private_data));
-	data->magic = EXT2_ET_MAGIC_UNIX_IO_CHANNEL;
-
-	if ((retval = alloc_cache(io, data)))
-		goto cleanup;
-
-	open_flags = (flags & IO_FLAG_RW) ? O_RDWR : O_RDONLY;
-#ifdef CONFIG_LFS
-	data->dev = open64(io->name, open_flags);
-#else
-	data->dev = open(io->name, open_flags);
-#endif
-	if (data->dev < 0) {
-		retval = errno;
-		goto cleanup;
-	}
-
-#ifdef __linux__
-#undef RLIM_INFINITY
-#if (defined(__alpha__) || ((defined(__sparc__) || defined(__mips__)) && (SIZEOF_LONG == 4)))
-#define RLIM_INFINITY	((unsigned long)(~0UL>>1))
-#else
-#define RLIM_INFINITY  (~0UL)
-#endif
-	/*
-	 * Work around a bug in 2.4.10-2.4.18 kernels where writes to
-	 * block devices are wrongly getting hit by the filesize
-	 * limit.  This workaround isn't perfect, since it won't work
-	 * if glibc wasn't built against 2.2 header files.  (Sigh.)
-	 *
-	 */
-	if ((flags & IO_FLAG_RW) &&
-	    (uname(&ut) == 0) &&
-	    ((ut.release[0] == '2') && (ut.release[1] == '.') &&
-	     (ut.release[2] == '4') && (ut.release[3] == '.') &&
-	     (ut.release[4] == '1') && (ut.release[5] >= '0') &&
-	     (ut.release[5] < '8')) &&
-	    (fstat(data->dev, &st) == 0) &&
-	    (S_ISBLK(st.st_mode))) {
-		struct rlimit	rlim;
-
-		rlim.rlim_cur = rlim.rlim_max = (unsigned long) RLIM_INFINITY;
-		setrlimit(RLIMIT_FSIZE, &rlim);
-		getrlimit(RLIMIT_FSIZE, &rlim);
-		if (((unsigned long) rlim.rlim_cur) <
-		    ((unsigned long) rlim.rlim_max)) {
-			rlim.rlim_cur = rlim.rlim_max;
-			setrlimit(RLIMIT_FSIZE, &rlim);
-		}
-	}
-#endif
-	*channel = io;
-	return 0;
-
-cleanup:
-	if (data) {
-		free_cache(data);
-		ext2fs_free_mem(&data);
-	}
-	ext2fs_free_mem(&io);
-	return retval;
-}
-
-static errcode_t unix_close(io_channel channel)
-{
-	struct unix_private_data *data;
-	errcode_t	retval = 0;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-	if (--channel->refcount > 0)
-		return 0;
-
-#ifndef NO_IO_CACHE
-	retval = flush_cached_blocks(channel, data, 0);
-#endif
-
-	if (close(data->dev) < 0)
-		retval = errno;
-	free_cache(data);
-
-	ext2fs_free_mem(&channel->private_data);
-	ext2fs_free_mem(&channel->name);
-	ext2fs_free_mem(&channel);
-	return retval;
-}
-
-static errcode_t unix_set_blksize(io_channel channel, int blksize)
-{
-	struct unix_private_data *data;
-	errcode_t		retval;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-	if (channel->block_size != blksize) {
-#ifndef NO_IO_CACHE
-		if ((retval = flush_cached_blocks(channel, data, 0)))
-			return retval;
-#endif
-
-		channel->block_size = blksize;
-		free_cache(data);
-		if ((retval = alloc_cache(channel, data)))
-			return retval;
-	}
-	return 0;
-}
-
-
-static errcode_t unix_read_blk(io_channel channel, unsigned long block,
-			       int count, void *buf)
-{
-	struct unix_private_data *data;
-	struct unix_cache *cache, *reuse[READ_DIRECT_SIZE];
-	errcode_t	retval;
-	char		*cp;
-	int		i, j;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-#ifdef NO_IO_CACHE
-	return raw_read_blk(channel, data, block, count, buf);
-#else
-	/*
-	 * If we're doing an odd-sized read or a very large read,
-	 * flush out the cache and then do a direct read.
-	 */
-	if (count < 0 || count > WRITE_DIRECT_SIZE) {
-		if ((retval = flush_cached_blocks(channel, data, 0)))
-			return retval;
-		return raw_read_blk(channel, data, block, count, buf);
-	}
-
-	cp = buf;
-	while (count > 0) {
-		/* If it's in the cache, use it! */
-		if ((cache = find_cached_block(data, block, &reuse[0]))) {
-#ifdef DEBUG
-			printf("Using cached block %d\n", block);
-#endif
-			memcpy(cp, cache->buf, channel->block_size);
-			count--;
-			block++;
-			cp += channel->block_size;
-			continue;
-		}
-		/*
-		 * Find the number of uncached blocks so we can do a
-		 * single read request
-		 */
-		for (i=1; i < count; i++)
-			if (find_cached_block(data, block+i, &reuse[i]))
-				break;
-#ifdef DEBUG
-		printf("Reading %d blocks starting at %d\n", i, block);
-#endif
-		if ((retval = raw_read_blk(channel, data, block, i, cp)))
-			return retval;
-
-		/* Save the results in the cache */
-		for (j=0; j < i; j++) {
-			count--;
-			cache = reuse[j];
-			reuse_cache(channel, data, cache, block++);
-			memcpy(cache->buf, cp, channel->block_size);
-			cp += channel->block_size;
-		}
-	}
-	return 0;
-#endif /* NO_IO_CACHE */
-}
-
-static errcode_t unix_write_blk(io_channel channel, unsigned long block,
-				int count, const void *buf)
-{
-	struct unix_private_data *data;
-	struct unix_cache *cache, *reuse;
-	errcode_t	retval = 0;
-	const char	*cp;
-	int		writethrough;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-#ifdef NO_IO_CACHE
-	return raw_write_blk(channel, data, block, count, buf);
-#else
-	/*
-	 * If we're doing an odd-sized write or a very large write,
-	 * flush out the cache completely and then do a direct write.
-	 */
-	if (count < 0 || count > WRITE_DIRECT_SIZE) {
-		if ((retval = flush_cached_blocks(channel, data, 1)))
-			return retval;
-		return raw_write_blk(channel, data, block, count, buf);
-	}
-
-	/*
-	 * For a moderate-sized multi-block write, first force a write
-	 * if we're in write-through cache mode, and then fill the
-	 * cache with the blocks.
-	 */
-	writethrough = channel->flags & CHANNEL_FLAGS_WRITETHROUGH;
-	if (writethrough)
-		retval = raw_write_blk(channel, data, block, count, buf);
-
-	cp = buf;
-	while (count > 0) {
-		cache = find_cached_block(data, block, &reuse);
-		if (!cache) {
-			cache = reuse;
-			reuse_cache(channel, data, cache, block);
-		}
-		memcpy(cache->buf, cp, channel->block_size);
-		cache->dirty = !writethrough;
-		count--;
-		block++;
-		cp += channel->block_size;
-	}
-	return retval;
-#endif /* NO_IO_CACHE */
-}
-
-static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
-				 int size, const void *buf)
-{
-	struct unix_private_data *data;
-	errcode_t	retval = 0;
-	ssize_t		actual;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-#ifndef NO_IO_CACHE
-	/*
-	 * Flush out the cache completely
-	 */
-	if ((retval = flush_cached_blocks(channel, data, 1)))
-		return retval;
-#endif
-
-	if (lseek(data->dev, offset + data->offset, SEEK_SET) < 0)
-		return errno;
-
-	actual = write(data->dev, buf, size);
-	if (actual != size)
-		return EXT2_ET_SHORT_WRITE;
-
-	return 0;
-}
-
-/*
- * Flush data buffers to disk.
- */
-static errcode_t unix_flush(io_channel channel)
-{
-	struct unix_private_data *data;
-	errcode_t retval = 0;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-#ifndef NO_IO_CACHE
-	retval = flush_cached_blocks(channel, data, 0);
-#endif
-	fsync(data->dev);
-	return retval;
-}
-
-static errcode_t unix_set_option(io_channel channel, const char *option,
-				 const char *arg)
-{
-	struct unix_private_data *data;
-	unsigned long tmp;
-	char *end;
-
-	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
-	data = (struct unix_private_data *) channel->private_data;
-	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
-
-	if (!strcmp(option, "offset")) {
-		if (!arg)
-			return EXT2_ET_INVALID_ARGUMENT;
-
-		tmp = strtoul(arg, &end, 0);
-		if (*end)
-			return EXT2_ET_INVALID_ARGUMENT;
-		data->offset = tmp;
-		return 0;
-	}
-	return EXT2_ET_INVALID_ARGUMENT;
-}