import the very fat e2fsck/fsck applets
diff --git a/e2fsprogs/e2fsck/swapfs.c b/e2fsprogs/e2fsck/swapfs.c
new file mode 100644
index 0000000..8d46404
--- /dev/null
+++ b/e2fsprogs/e2fsck/swapfs.c
@@ -0,0 +1,269 @@
+/*
+ * swapfs.c --- byte-swap an ext2 filesystem
+ *
+ * Copyright 1996, 1997 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ *
+ */
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <et/com_err.h>
+#include "e2fsck.h"
+
+#ifdef ENABLE_SWAPFS
+
+struct swap_block_struct {
+ ext2_ino_t ino;
+ int isdir;
+ errcode_t errcode;
+ char *dir_buf;
+ struct ext2_inode *inode;
+};
+
+/*
+ * This is a helper function for block_iterate. We mark all of the
+ * indirect and direct blocks as changed, so that block_iterate will
+ * write them out.
+ */
+static int swap_block(ext2_filsys fs, blk_t *block_nr, int blockcnt,
+ void *priv_data)
+{
+ errcode_t retval;
+
+ struct swap_block_struct *sb = (struct swap_block_struct *) priv_data;
+
+ if (sb->isdir && (blockcnt >= 0) && *block_nr) {
+ retval = ext2fs_read_dir_block(fs, *block_nr, sb->dir_buf);
+ if (retval) {
+ sb->errcode = retval;
+ return BLOCK_ABORT;
+ }
+ retval = ext2fs_write_dir_block(fs, *block_nr, sb->dir_buf);
+ if (retval) {
+ sb->errcode = retval;
+ return BLOCK_ABORT;
+ }
+ }
+ if (blockcnt >= 0) {
+ if (blockcnt < EXT2_NDIR_BLOCKS)
+ return 0;
+ return BLOCK_CHANGED;
+ }
+ if (blockcnt == BLOCK_COUNT_IND) {
+ if (*block_nr == sb->inode->i_block[EXT2_IND_BLOCK])
+ return 0;
+ return BLOCK_CHANGED;
+ }
+ if (blockcnt == BLOCK_COUNT_DIND) {
+ if (*block_nr == sb->inode->i_block[EXT2_DIND_BLOCK])
+ return 0;
+ return BLOCK_CHANGED;
+ }
+ if (blockcnt == BLOCK_COUNT_TIND) {
+ if (*block_nr == sb->inode->i_block[EXT2_TIND_BLOCK])
+ return 0;
+ return BLOCK_CHANGED;
+ }
+ return BLOCK_CHANGED;
+}
+
+/*
+ * This function is responsible for byte-swapping all of the indirect,
+ * block pointers. It is also responsible for byte-swapping directories.
+ */
+static void swap_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, char *block_buf,
+ struct ext2_inode *inode)
+{
+ errcode_t retval;
+ struct swap_block_struct sb;
+
+ sb.ino = ino;
+ sb.inode = inode;
+ sb.dir_buf = block_buf + ctx->fs->blocksize*3;
+ sb.errcode = 0;
+ sb.isdir = 0;
+ if (LINUX_S_ISDIR(inode->i_mode))
+ sb.isdir = 1;
+
+ retval = ext2fs_block_iterate(ctx->fs, ino, 0, block_buf,
+ swap_block, &sb);
+ if (retval) {
+ com_err("swap_inode_blocks", retval,
+ _("while calling ext2fs_block_iterate"));
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ if (sb.errcode) {
+ com_err("swap_inode_blocks", sb.errcode,
+ _("while calling iterator function"));
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+}
+
+static void swap_inodes(e2fsck_t ctx)
+{
+ ext2_filsys fs = ctx->fs;
+ dgrp_t group;
+ unsigned int i;
+ ext2_ino_t ino = 1;
+ char *buf, *block_buf;
+ errcode_t retval;
+ struct ext2_inode * inode;
+
+ e2fsck_use_inode_shortcuts(ctx, 1);
+
+ retval = ext2fs_get_mem(fs->blocksize * fs->inode_blocks_per_group,
+ &buf);
+ if (retval) {
+ com_err("swap_inodes", retval,
+ _("while allocating inode buffer"));
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
+ "block interate buffer");
+ for (group = 0; group < fs->group_desc_count; group++) {
+ retval = io_channel_read_blk(fs->io,
+ fs->group_desc[group].bg_inode_table,
+ fs->inode_blocks_per_group, buf);
+ if (retval) {
+ com_err("swap_inodes", retval,
+ _("while reading inode table (group %d)"),
+ group);
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ inode = (struct ext2_inode *) buf;
+ for (i=0; i < fs->super->s_inodes_per_group;
+ i++, ino++, inode++) {
+ ctx->stashed_ino = ino;
+ ctx->stashed_inode = inode;
+
+ if (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)
+ ext2fs_swap_inode(fs, inode, inode, 0);
+
+ /*
+ * Skip deleted files.
+ */
+ if (inode->i_links_count == 0)
+ continue;
+
+ if (LINUX_S_ISDIR(inode->i_mode) ||
+ ((inode->i_block[EXT2_IND_BLOCK] ||
+ inode->i_block[EXT2_DIND_BLOCK] ||
+ inode->i_block[EXT2_TIND_BLOCK]) &&
+ ext2fs_inode_has_valid_blocks(inode)))
+ swap_inode_blocks(ctx, ino, block_buf, inode);
+
+ if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
+ return;
+
+ if (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)
+ ext2fs_swap_inode(fs, inode, inode, 1);
+ }
+ retval = io_channel_write_blk(fs->io,
+ fs->group_desc[group].bg_inode_table,
+ fs->inode_blocks_per_group, buf);
+ if (retval) {
+ com_err("swap_inodes", retval,
+ _("while writing inode table (group %d)"),
+ group);
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ }
+ ext2fs_free_mem(&buf);
+ ext2fs_free_mem(&block_buf);
+ e2fsck_use_inode_shortcuts(ctx, 0);
+ ext2fs_flush_icache(fs);
+}
+
+#if defined(__powerpc__) && defined(EXT2FS_ENABLE_SWAPFS)
+/*
+ * On the PowerPC, the big-endian variant of the ext2 filesystem
+ * has its bitmaps stored as 32-bit words with bit 0 as the LSB
+ * of each word. Thus a bitmap with only bit 0 set would be, as
+ * a string of bytes, 00 00 00 01 00 ...
+ * To cope with this, we byte-reverse each word of a bitmap if
+ * we have a big-endian filesystem, that is, if we are *not*
+ * byte-swapping other word-sized numbers.
+ */
+#define EXT2_BIG_ENDIAN_BITMAPS
+#endif
+
+#ifdef EXT2_BIG_ENDIAN_BITMAPS
+static void ext2fs_swap_bitmap(ext2fs_generic_bitmap bmap)
+{
+ __u32 *p = (__u32 *) bmap->bitmap;
+ int n, nbytes = (bmap->end - bmap->start + 7) / 8;
+
+ for (n = nbytes / sizeof(__u32); n > 0; --n, ++p)
+ *p = ext2fs_swab32(*p);
+}
+#endif
+
+
+void swap_filesys(e2fsck_t ctx)
+{
+ ext2_filsys fs = ctx->fs;
+#ifdef RESOURCE_TRACK
+ struct resource_track rtrack;
+
+ init_resource_track(&rtrack);
+#endif
+
+ if (!(ctx->options & E2F_OPT_PREEN))
+ printf(_("Pass 0: Doing byte-swap of filesystem\n"));
+
+#ifdef MTRACE
+ mtrace_print("Byte swap");
+#endif
+
+ if (fs->super->s_mnt_count) {
+ fprintf(stderr, _("%s: the filesystem must be freshly "
+ "checked using fsck\n"
+ "and not mounted before trying to "
+ "byte-swap it.\n"), ctx->device_name);
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
+ fs->flags &= ~(EXT2_FLAG_SWAP_BYTES|
+ EXT2_FLAG_SWAP_BYTES_WRITE);
+ fs->flags |= EXT2_FLAG_SWAP_BYTES_READ;
+ } else {
+ fs->flags &= ~EXT2_FLAG_SWAP_BYTES_READ;
+ fs->flags |= EXT2_FLAG_SWAP_BYTES_WRITE;
+ }
+ swap_inodes(ctx);
+ if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
+ return;
+ if (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)
+ fs->flags |= EXT2_FLAG_SWAP_BYTES;
+ fs->flags &= ~(EXT2_FLAG_SWAP_BYTES_READ|
+ EXT2_FLAG_SWAP_BYTES_WRITE);
+
+#ifdef EXT2_BIG_ENDIAN_BITMAPS
+ e2fsck_read_bitmaps(ctx);
+ ext2fs_swap_bitmap(fs->inode_map);
+ ext2fs_swap_bitmap(fs->block_map);
+ fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
+#endif
+ fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
+ ext2fs_flush(fs);
+ fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
+
+#ifdef RESOURCE_TRACK
+ if (ctx->options & E2F_OPT_TIME2)
+ print_resource_track(_("Byte swap"), &rtrack);
+#endif
+}
+
+#endif