put small subset of e2fsprogs back in the tree:

lsattr, chattr, fsck. Old e2fsprogs tree is in
e2fsprogs/old_e2fsprogs/*.

1 files changed, 703 insertions, 0 deletions

diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c b/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c
new file mode 100644
index 0000000..474f073
--- /dev/null
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c
@@ -0,0 +1,703 @@
+/* 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;
+}