import the very fat e2fsck/fsck applets

1 files changed, 804 insertions, 0 deletions

diff --git a/e2fsprogs/e2fsck/pass3.c b/e2fsprogs/e2fsck/pass3.c
new file mode 100644
index 000000000..a92c8904c
--- /dev/null
+++ b/e2fsprogs/e2fsck/pass3.c
@@ -0,0 +1,804 @@
+/*
+ * pass3.c -- pass #3 of e2fsck: Check for directory connectivity
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ * 
+ * Pass #3 assures that all directories are connected to the
+ * filesystem tree, using the following algorithm:
+ *
+ * First, the root directory is checked to make sure it exists; if
+ * not, e2fsck will offer to create a new one.  It is then marked as
+ * "done".
+ * 
+ * Then, pass3 interates over all directory inodes; for each directory
+ * it attempts to trace up the filesystem tree, using dirinfo.parent
+ * until it reaches a directory which has been marked "done".  If it
+ * can not do so, then the directory must be disconnected, and e2fsck
+ * will offer to reconnect it to /lost+found.  While it is chasing
+ * parent pointers up the filesystem tree, if pass3 sees a directory
+ * twice, then it has detected a filesystem loop, and it will again
+ * offer to reconnect the directory to /lost+found in to break the
+ * filesystem loop.
+ * 
+ * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to
+ * reconnect inodes to /lost+found; this subroutine is also used by
+ * pass 4.  e2fsck_reconnect_file() calls get_lost_and_found(), which
+ * is responsible for creating /lost+found if it does not exist.
+ *
+ * Pass 3 frees the following data structures:
+ *     	- The dirinfo directory information cache.
+ */
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+#include "e2fsck.h"
+#include "problem.h"
+
+static void check_root(e2fsck_t ctx);
+static int check_directory(e2fsck_t ctx, struct dir_info *dir,
+			   struct problem_context *pctx);
+static void fix_dotdot(e2fsck_t ctx, struct dir_info *dir, ext2_ino_t parent);
+
+static ext2fs_inode_bitmap inode_loop_detect = 0;
+static ext2fs_inode_bitmap inode_done_map = 0;
+	
+void e2fsck_pass3(e2fsck_t ctx)
+{
+	ext2_filsys fs = ctx->fs;
+	int		i;
+#ifdef RESOURCE_TRACK
+	struct resource_track	rtrack;
+#endif
+	struct problem_context	pctx;
+	struct dir_info	*dir;
+	unsigned long maxdirs, count;
+
+#ifdef RESOURCE_TRACK
+	init_resource_track(&rtrack);
+#endif
+
+	clear_problem_context(&pctx);
+
+#ifdef MTRACE
+	mtrace_print("Pass 3");
+#endif
+
+	if (!(ctx->options & E2F_OPT_PREEN))
+		fix_problem(ctx, PR_3_PASS_HEADER, &pctx);
+
+	/*
+	 * Allocate some bitmaps to do loop detection.
+	 */
+	pctx.errcode = ext2fs_allocate_inode_bitmap(fs, _("inode done bitmap"),
+						    &inode_done_map);
+	if (pctx.errcode) {
+		pctx.num = 2;
+		fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		goto abort_exit;
+	}
+#ifdef RESOURCE_TRACK
+	if (ctx->options & E2F_OPT_TIME) {
+		e2fsck_clear_progbar(ctx);
+		print_resource_track(_("Peak memory"), &ctx->global_rtrack);
+	}
+#endif
+
+	check_root(ctx);
+	if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
+		goto abort_exit;
+
+	ext2fs_mark_inode_bitmap(inode_done_map, EXT2_ROOT_INO);
+
+	maxdirs = e2fsck_get_num_dirinfo(ctx);
+	count = 1;
+
+	if (ctx->progress)
+		if ((ctx->progress)(ctx, 3, 0, maxdirs))
+			goto abort_exit;
+	
+	for (i=0; (dir = e2fsck_dir_info_iter(ctx, &i)) != 0;) {
+		if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
+			goto abort_exit;
+		if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs))
+			goto abort_exit;
+		if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dir->ino))
+			if (check_directory(ctx, dir, &pctx))
+				goto abort_exit;
+	}
+
+	/*
+	 * Force the creation of /lost+found if not present
+	 */
+	if ((ctx->flags & E2F_OPT_READONLY) == 0)
+		e2fsck_get_lost_and_found(ctx, 1);
+
+	/*
+	 * If there are any directories that need to be indexed or
+	 * optimized, do it here.
+	 */
+	e2fsck_rehash_directories(ctx);
+	
+abort_exit:
+	e2fsck_free_dir_info(ctx);
+	if (inode_loop_detect) {
+		ext2fs_free_inode_bitmap(inode_loop_detect);
+		inode_loop_detect = 0;
+	}
+	if (inode_done_map) {
+		ext2fs_free_inode_bitmap(inode_done_map);
+		inode_done_map = 0;
+	}
+
+#ifdef RESOURCE_TRACK
+	if (ctx->options & E2F_OPT_TIME2) {
+		e2fsck_clear_progbar(ctx);
+		print_resource_track(_("Pass 3"), &rtrack);
+	}
+#endif
+}
+
+/*
+ * This makes sure the root inode is present; if not, we ask if the
+ * user wants us to create it.  Not creating it is a fatal error.
+ */
+static void check_root(e2fsck_t ctx)
+{
+	ext2_filsys fs = ctx->fs;
+	blk_t			blk;
+	struct ext2_inode	inode;
+	char *			block;
+	struct problem_context	pctx;
+	
+	clear_problem_context(&pctx);
+	
+	if (ext2fs_test_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO)) {
+		/*
+		 * If the root inode is not a directory, die here.  The
+		 * user must have answered 'no' in pass1 when we
+		 * offered to clear it.
+		 */
+		if (!(ext2fs_test_inode_bitmap(ctx->inode_dir_map,
+					       EXT2_ROOT_INO))) {
+			fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx);
+			ctx->flags |= E2F_FLAG_ABORT;
+		}
+		return;
+	}
+
+	if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) {
+		fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		return;
+	}
+
+	e2fsck_read_bitmaps(ctx);
+	
+	/*
+	 * First, find a free block
+	 */
+	pctx.errcode = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_new_block";
+		fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		return;
+	}
+	ext2fs_mark_block_bitmap(ctx->block_found_map, blk);
+	ext2fs_mark_block_bitmap(fs->block_map, blk);
+	ext2fs_mark_bb_dirty(fs);
+
+	/*
+	 * Now let's create the actual data block for the inode
+	 */
+	pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
+					    &block);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_new_dir_block";
+		fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		return;
+	}
+
+	pctx.errcode = ext2fs_write_dir_block(fs, blk, block);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_write_dir_block";
+		fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		return;
+	}
+	ext2fs_free_mem(&block);
+
+	/*
+	 * Set up the inode structure
+	 */
+	memset(&inode, 0, sizeof(inode));
+	inode.i_mode = 040755;
+	inode.i_size = fs->blocksize;
+	inode.i_atime = inode.i_ctime = inode.i_mtime = time(0);
+	inode.i_links_count = 2;
+	inode.i_blocks = fs->blocksize / 512;
+	inode.i_block[0] = blk;
+
+	/*
+	 * Write out the inode.
+	 */
+	pctx.errcode = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, &inode);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_write_inode";
+		fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
+		ctx->flags |= E2F_FLAG_ABORT;
+		return;
+	}
+	
+	/*
+	 * Miscellaneous bookkeeping...
+	 */
+	e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
+	ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2);
+	ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2);
+
+	ext2fs_mark_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO);
+	ext2fs_mark_inode_bitmap(ctx->inode_dir_map, EXT2_ROOT_INO);
+	ext2fs_mark_inode_bitmap(fs->inode_map, EXT2_ROOT_INO);
+	ext2fs_mark_ib_dirty(fs);
+}
+
+/*
+ * This subroutine is responsible for making sure that a particular
+ * directory is connected to the root; if it isn't we trace it up as
+ * far as we can go, and then offer to connect the resulting parent to
+ * the lost+found.  We have to do loop detection; if we ever discover
+ * a loop, we treat that as a disconnected directory and offer to
+ * reparent it to lost+found.
+ * 
+ * However, loop detection is expensive, because for very large
+ * filesystems, the inode_loop_detect bitmap is huge, and clearing it
+ * is non-trivial.  Loops in filesystems are also a rare error case,
+ * and we shouldn't optimize for error cases.  So we try two passes of
+ * the algorithm.  The first time, we ignore loop detection and merely
+ * increment a counter; if the counter exceeds some extreme threshold,
+ * then we try again with the loop detection bitmap enabled.
+ */
+static int check_directory(e2fsck_t ctx, struct dir_info *dir,
+			   struct problem_context *pctx)
+{
+	ext2_filsys 	fs = ctx->fs;
+	struct dir_info *p = dir;
+	int		loop_pass = 0, parent_count = 0;
+
+	if (!p)
+		return 0;
+
+	while (1) {
+		/*
+		 * Mark this inode as being "done"; by the time we
+		 * return from this function, the inode we either be
+		 * verified as being connected to the directory tree,
+		 * or we will have offered to reconnect this to
+		 * lost+found.
+		 *
+		 * If it was marked done already, then we've reached a
+		 * parent we've already checked.
+		 */
+	  	if (ext2fs_mark_inode_bitmap(inode_done_map, p->ino))
+			break;
+
+		/*
+		 * If this directory doesn't have a parent, or we've
+		 * seen the parent once already, then offer to
+		 * reparent it to lost+found
+		 */
+		if (!p->parent ||
+		    (loop_pass && 
+		     (ext2fs_test_inode_bitmap(inode_loop_detect,
+					      p->parent)))) {
+			pctx->ino = p->ino;
+			if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) {
+				if (e2fsck_reconnect_file(ctx, pctx->ino))
+					ext2fs_unmark_valid(fs);
+				else {
+					p = e2fsck_get_dir_info(ctx, pctx->ino);
+					p->parent = ctx->lost_and_found;
+					fix_dotdot(ctx, p, ctx->lost_and_found);
+				}
+			}
+			break;
+		}
+		p = e2fsck_get_dir_info(ctx, p->parent);
+		if (!p) {
+			fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
+			return 0;
+		}
+		if (loop_pass) {
+			ext2fs_mark_inode_bitmap(inode_loop_detect,
+						 p->ino);
+		} else if (parent_count++ > 2048) {
+			/*
+			 * If we've run into a path depth that's
+			 * greater than 2048, try again with the inode
+			 * loop bitmap turned on and start from the
+			 * top.
+			 */
+			loop_pass = 1;
+			if (inode_loop_detect)
+				ext2fs_clear_inode_bitmap(inode_loop_detect);
+			else {
+				pctx->errcode = ext2fs_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), &inode_loop_detect);
+				if (pctx->errcode) {
+					pctx->num = 1;
+					fix_problem(ctx, 
+				    PR_3_ALLOCATE_IBITMAP_ERROR, pctx);
+					ctx->flags |= E2F_FLAG_ABORT;
+					return -1;
+				}
+			}
+			p = dir;
+		}
+	}
+
+	/*
+	 * Make sure that .. and the parent directory are the same;
+	 * offer to fix it if not.
+	 */
+	if (dir->parent != dir->dotdot) {
+		pctx->ino = dir->ino;
+		pctx->ino2 = dir->dotdot;
+		pctx->dir = dir->parent;
+		if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx))
+			fix_dotdot(ctx, dir, dir->parent);
+	}
+	return 0;
+}
+
+/*
+ * This routine gets the lost_and_found inode, making it a directory
+ * if necessary
+ */
+ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix)
+{
+	ext2_filsys fs = ctx->fs;
+	ext2_ino_t			ino;
+	blk_t			blk;
+	errcode_t		retval;
+	struct ext2_inode	inode;
+	char *			block;
+	static const char	name[] = "lost+found";
+	struct 	problem_context	pctx;
+	struct dir_info 	*dirinfo;
+
+	if (ctx->lost_and_found)
+		return ctx->lost_and_found;
+
+	clear_problem_context(&pctx);
+	
+	retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name,
+			       sizeof(name)-1, 0, &ino);
+	if (retval && !fix)
+		return 0;
+	if (!retval) {
+		if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, ino)) {
+			ctx->lost_and_found = ino;
+			return ino;
+		}
+				
+		/* Lost+found isn't a directory! */
+		if (!fix)
+			return 0;
+		pctx.ino = ino;
+		if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx))
+			return 0;
+
+		/* OK, unlink the old /lost+found file. */
+		pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0);
+		if (pctx.errcode) {
+			pctx.str = "ext2fs_unlink";
+			fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
+			return 0;
+		}
+		dirinfo = e2fsck_get_dir_info(ctx, ino);
+		if (dirinfo)
+			dirinfo->parent = 0;
+		e2fsck_adjust_inode_count(ctx, ino, -1);
+	} else if (retval != EXT2_ET_FILE_NOT_FOUND) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx);
+	}
+	if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0))
+		return 0;
+
+	/*
+	 * Read the inode and block bitmaps in; we'll be messing with
+	 * them.
+	 */
+	e2fsck_read_bitmaps(ctx);
+	
+	/*
+	 * First, find a free block
+	 */
+	retval = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx);
+		return 0;
+	}
+	ext2fs_mark_block_bitmap(ctx->block_found_map, blk);
+	ext2fs_block_alloc_stats(fs, blk, +1);
+
+	/*
+	 * Next find a free inode.
+	 */
+	retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040700,
+				  ctx->inode_used_map, &ino);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx);
+		return 0;
+	}
+	ext2fs_mark_inode_bitmap(ctx->inode_used_map, ino);
+	ext2fs_mark_inode_bitmap(ctx->inode_dir_map, ino);
+	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
+
+	/*
+	 * Now let's create the actual data block for the inode
+	 */
+	retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx);
+		return 0;
+	}
+
+	retval = ext2fs_write_dir_block(fs, blk, block);
+	ext2fs_free_mem(&block);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx);
+		return 0;
+	}
+
+	/*
+	 * Set up the inode structure
+	 */
+	memset(&inode, 0, sizeof(inode));
+	inode.i_mode = 040700;
+	inode.i_size = fs->blocksize;
+	inode.i_atime = inode.i_ctime = inode.i_mtime = time(0);
+	inode.i_links_count = 2;
+	inode.i_blocks = fs->blocksize / 512;
+	inode.i_block[0] = blk;
+
+	/*
+	 * Next, write out the inode.
+	 */
+	pctx.errcode = ext2fs_write_new_inode(fs, ino, &inode);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_write_inode";
+		fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
+		return 0;
+	}
+	/*
+	 * Finally, create the directory link
+	 */
+	pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR);
+	if (pctx.errcode) {
+		pctx.str = "ext2fs_link";
+		fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
+		return 0;
+	}
+
+	/*
+	 * Miscellaneous bookkeeping that needs to be kept straight.
+	 */
+	e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO);
+	e2fsck_adjust_inode_count(ctx, EXT2_ROOT_INO, 1);
+	ext2fs_icount_store(ctx->inode_count, ino, 2);
+	ext2fs_icount_store(ctx->inode_link_info, ino, 2);
+	ctx->lost_and_found = ino;
+#if 0
+	printf("/lost+found created; inode #%lu\n", ino);
+#endif
+	return ino;
+}
+
+/*
+ * This routine will connect a file to lost+found
+ */
+int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino)
+{
+	ext2_filsys fs = ctx->fs;
+	errcode_t	retval;
+	char		name[80];
+	struct problem_context	pctx;
+	struct ext2_inode 	inode;
+	int		file_type = 0;
+
+	clear_problem_context(&pctx);
+	pctx.ino = ino;
+
+	if (!ctx->bad_lost_and_found && !ctx->lost_and_found) {
+		if (e2fsck_get_lost_and_found(ctx, 1) == 0)
+			ctx->bad_lost_and_found++;
+	}
+	if (ctx->bad_lost_and_found) {
+		fix_problem(ctx, PR_3_NO_LPF, &pctx);
+		return 1;
+	}
+	
+	sprintf(name, "#%u", ino);
+	if (ext2fs_read_inode(fs, ino, &inode) == 0)
+		file_type = ext2_file_type(inode.i_mode);
+	retval = ext2fs_link(fs, ctx->lost_and_found, name, ino, file_type);
+	if (retval == EXT2_ET_DIR_NO_SPACE) {
+		if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx))
+			return 1;
+		retval = e2fsck_expand_directory(ctx, ctx->lost_and_found, 
+						 1, 0);
+		if (retval) {
+			pctx.errcode = retval;
+			fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx);
+			return 1;
+		}
+		retval = ext2fs_link(fs, ctx->lost_and_found, name,
+				     ino, file_type);
+	}
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx);
+		return 1;
+	}
+	e2fsck_adjust_inode_count(ctx, ino, 1);
+
+	return 0;
+}
+
+/*
+ * Utility routine to adjust the inode counts on an inode.
+ */
+errcode_t e2fsck_adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj)
+{
+	ext2_filsys fs = ctx->fs;
+	errcode_t		retval;
+	struct ext2_inode 	inode;
+	
+	if (!ino)
+		return 0;
+
+	retval = ext2fs_read_inode(fs, ino, &inode);
+	if (retval)
+		return retval;
+
+#if 0
+	printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj,
+	       inode.i_links_count);
+#endif
+
+	if (adj == 1) {
+		ext2fs_icount_increment(ctx->inode_count, ino, 0);
+		if (inode.i_links_count == (__u16) ~0)
+			return 0;
+		ext2fs_icount_increment(ctx->inode_link_info, ino, 0);
+		inode.i_links_count++;
+	} else if (adj == -1) {
+		ext2fs_icount_decrement(ctx->inode_count, ino, 0);
+		if (inode.i_links_count == 0)
+			return 0;
+		ext2fs_icount_decrement(ctx->inode_link_info, ino, 0);
+		inode.i_links_count--;
+	}
+	
+	retval = ext2fs_write_inode(fs, ino, &inode);
+	if (retval)
+		return retval;
+
+	return 0;
+}
+
+/*
+ * Fix parent --- this routine fixes up the parent of a directory.
+ */
+struct fix_dotdot_struct {
+	ext2_filsys	fs;
+	ext2_ino_t	parent;
+	int		done;
+	e2fsck_t	ctx;
+};
+
+static int fix_dotdot_proc(struct ext2_dir_entry *dirent,
+			   int	offset EXT2FS_ATTR((unused)),
+			   int	blocksize EXT2FS_ATTR((unused)),
+			   char	*buf EXT2FS_ATTR((unused)),
+			   void	*priv_data)
+{
+	struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data;
+	errcode_t	retval;
+	struct problem_context pctx;
+
+	if ((dirent->name_len & 0xFF) != 2)
+		return 0;
+	if (strncmp(dirent->name, "..", 2))
+		return 0;
+
+	clear_problem_context(&pctx);
+	
+	retval = e2fsck_adjust_inode_count(fp->ctx, dirent->inode, -1);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
+	}
+	retval = e2fsck_adjust_inode_count(fp->ctx, fp->parent, 1);
+	if (retval) {
+		pctx.errcode = retval;
+		fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
+	}
+	dirent->inode = fp->parent;
+
+	fp->done++;
+	return DIRENT_ABORT | DIRENT_CHANGED;
+}
+
+static void fix_dotdot(e2fsck_t ctx, struct dir_info *dir, ext2_ino_t parent)
+{
+	ext2_filsys fs = ctx->fs;
+	errcode_t	retval;
+	struct fix_dotdot_struct fp;
+	struct problem_context pctx;
+
+	fp.fs = fs;
+	fp.parent = parent;
+	fp.done = 0;
+	fp.ctx = ctx;
+
+#if 0
+	printf("Fixing '..' of inode %lu to be %lu...\n", dir->ino, parent);
+#endif
+	
+	retval = ext2fs_dir_iterate(fs, dir->ino, DIRENT_FLAG_INCLUDE_EMPTY,
+				    0, fix_dotdot_proc, &fp);
+	if (retval || !fp.done) {
+		clear_problem_context(&pctx);
+		pctx.ino = dir->ino;
+		pctx.errcode = retval;
+		fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR :
+			    PR_3_FIX_PARENT_NOFIND, &pctx);
+		ext2fs_unmark_valid(fs);
+	}
+	dir->dotdot = parent;
+	
+	return;
+}
+
+/*
+ * These routines are responsible for expanding a /lost+found if it is
+ * too small.
+ */
+
+struct expand_dir_struct {
+	int			num;
+	int			guaranteed_size;
+	int			newblocks;
+	int			last_block;
+	errcode_t		err;
+	e2fsck_t		ctx;
+};
+
+static int expand_dir_proc(ext2_filsys fs,
+			   blk_t	*blocknr,
+			   e2_blkcnt_t	blockcnt,
+			   blk_t ref_block EXT2FS_ATTR((unused)),
+			   int ref_offset EXT2FS_ATTR((unused)),
+			   void	*priv_data)
+{
+	struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
+	blk_t	new_blk;
+	static blk_t	last_blk = 0;
+	char		*block;
+	errcode_t	retval;
+	e2fsck_t	ctx;
+
+	ctx = es->ctx;
+	
+	if (es->guaranteed_size && blockcnt >= es->guaranteed_size)
+		return BLOCK_ABORT;
+
+	if (blockcnt > 0)
+		es->last_block = blockcnt;
+	if (*blocknr) {
+		last_blk = *blocknr;
+		return 0;
+	}
+	retval = ext2fs_new_block(fs, last_blk, ctx->block_found_map,
+				  &new_blk);
+	if (retval) {
+		es->err = retval;
+		return BLOCK_ABORT;
+	}
+	if (blockcnt > 0) {
+		retval = ext2fs_new_dir_block(fs, 0, 0, &block);
+		if (retval) {
+			es->err = retval;
+			return BLOCK_ABORT;
+		}
+		es->num--;
+		retval = ext2fs_write_dir_block(fs, new_blk, block);
+	} else {
+		retval = ext2fs_get_mem(fs->blocksize, &block);
+		if (retval) {
+			es->err = retval;
+			return BLOCK_ABORT;
+		}
+		memset(block, 0, fs->blocksize);
+		retval = io_channel_write_blk(fs->io, new_blk, 1, block);
+	}	
+	if (retval) {
+		es->err = retval;
+		return BLOCK_ABORT;
+	}
+	ext2fs_free_mem(&block);
+	*blocknr = new_blk;
+	ext2fs_mark_block_bitmap(ctx->block_found_map, new_blk);
+	ext2fs_block_alloc_stats(fs, new_blk, +1);
+	es->newblocks++;
+	
+	if (es->num == 0)
+		return (BLOCK_CHANGED | BLOCK_ABORT);
+	else
+		return BLOCK_CHANGED;
+}
+
+errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir,
+				  int num, int guaranteed_size)
+{
+	ext2_filsys fs = ctx->fs;
+	errcode_t	retval;
+	struct expand_dir_struct es;
+	struct ext2_inode	inode;
+	
+	if (!(fs->flags & EXT2_FLAG_RW))
+		return EXT2_ET_RO_FILSYS;
+
+	/*
+	 * Read the inode and block bitmaps in; we'll be messing with
+	 * them.
+	 */
+	e2fsck_read_bitmaps(ctx);
+
+	retval = ext2fs_check_directory(fs, dir);
+	if (retval)
+		return retval;
+	
+	es.num = num;
+	es.guaranteed_size = guaranteed_size;
+	es.last_block = 0;
+	es.err = 0;
+	es.newblocks = 0;
+	es.ctx = ctx;
+	
+	retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
+				       0, expand_dir_proc, &es);
+
+	if (es.err)
+		return es.err;
+
+	/*
+	 * Update the size and block count fields in the inode.
+	 */
+	retval = ext2fs_read_inode(fs, dir, &inode);
+	if (retval)
+		return retval;
+	
+	inode.i_size = (es.last_block + 1) * fs->blocksize;
+	inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
+
+	e2fsck_write_inode(ctx, dir, &inode, "expand_directory");
+
+	return 0;
+}
+