e2fsck/pass2.c - platform/external/e2fsprogs_custom - Gitiles

 /*
  * pass2.c --- check directory structure
  *
  * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o
  *
  * %Begin-Header%
  * This file may be redistributed under the terms of the GNU Public
  * License.
  * %End-Header%
  *
  * Pass 2 of e2fsck iterates through all active directory inodes, and
  * applies to following tests to each directory entry in the directory
  * blocks in the inodes:
  *
  *	- The length of the directory entry (rec_len) should be at
  * 		least 8 bytes, and no more than the remaining space
  * 		left in the directory block.
  * 	- The length of the name in the directory entry (name_len)
  * 		should be less than (rec_len - 8).
  *	- The inode number in the directory entry should be within
  * 		legal bounds.
  * 	- The inode number should refer to a in-use inode.
  *	- The first entry should be '.', and its inode should be
  * 		the inode of the directory.
  * 	- The second entry should be '..'.
  *
  * To minimize disk seek time, the directory blocks are processed in
  * sorted order of block numbers.
  *
  * Pass 2 also collects the following information:
  * 	- The inode numbers of the subdirectories for each directory.
  *
  * Pass 2 relies on the following information from previous passes:
  * 	- The directory information collected in pass 1.
  * 	- The inode_used_map bitmap
  * 	- The inode_bad_map bitmap
  * 	- The inode_dir_map bitmap
  *
  * Pass 2 frees the following data structures
  * 	- The inode_bad_map bitmap
  */

 #include "e2fsck.h"
 #include "problem.h"

 /*
  * Keeps track of how many times an inode is referenced.
  */
 static void deallocate_inode(e2fsck_t ctx, ino_t ino,
 			     char* block_buf);
 static int check_dir_block(ext2_filsys fs,
 			   struct ext2_db_entry *dir_blocks_info,
 			   void *priv_data);
 static int allocate_dir_block(e2fsck_t ctx,
 			      struct ext2_db_entry *dir_blocks_info,
 			      char *buf, struct problem_context *pctx);
 static int update_dir_block(ext2_filsys fs,
 			    blk_t	*block_nr,
 			    int blockcnt,
 			    void *priv_data);

 struct check_dir_struct {
 	char *buf;
 	struct problem_context	pctx;
 	int	count, max;
 	e2fsck_t ctx;
 };

 void e2fsck_pass2(e2fsck_t ctx)
 {
 	ext2_filsys 	fs = ctx->fs;
 	char	*buf;
 #ifdef RESOURCE_TRACK
 	struct resource_track	rtrack;
 #endif
 	struct dir_info *dir;
 	struct check_dir_struct cd;

 #ifdef RESOURCE_TRACK
 	init_resource_track(&rtrack);
 #endif

 	clear_problem_context(&cd.pctx);

 #ifdef MTRACE
 	mtrace_print("Pass 2");
 #endif

 	if (!(ctx->options & E2F_OPT_PREEN))
 		fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);

 	cd.pctx.errcode = ext2fs_create_icount2(fs, EXT2_ICOUNT_OPT_INCREMENT,
 						0, ctx->inode_link_info,
 						&ctx->inode_count);
 	if (cd.pctx.errcode) {
 		fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
 		ctx->flags |= E2F_FLAG_ABORT;
 		return;
 	}
 	buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize,
 					      "directory scan buffer");

 	/*
 	 * Set up the parent pointer for the root directory, if
 	 * present.  (If the root directory is not present, we will
 	 * create it in pass 3.)
 	 */
 	dir = e2fsck_get_dir_info(ctx, EXT2_ROOT_INO);
 	if (dir)
 		dir->parent = EXT2_ROOT_INO;

 	cd.buf = buf;
 	cd.ctx = ctx;
 	cd.count = 1;
 	cd.max = ext2fs_dblist_count(fs->dblist);

 	if (ctx->progress)
 		(void) (ctx->progress)(ctx, 2, 0, cd.max);

 	cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
 						&cd);
 	if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 		return;
 	if (cd.pctx.errcode) {
 		fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
 		ctx->flags |= E2F_FLAG_ABORT;
 		return;
 	}

 	ext2fs_free_mem((void **) &buf);
 	ext2fs_free_dblist(fs->dblist);

 	if (ctx->inode_bad_map) {
 		ext2fs_free_inode_bitmap(ctx->inode_bad_map);
 		ctx->inode_bad_map = 0;
 	}
 #ifdef RESOURCE_TRACK
 	if (ctx->options & E2F_OPT_TIME2) {
 		e2fsck_clear_progbar(ctx);
 		print_resource_track("Pass 2", &rtrack);
 	}
 #endif
 }

 /*
  * Make sure the first entry in the directory is '.', and that the
  * directory entry is sane.
  */
 static int check_dot(e2fsck_t ctx,
 		     struct ext2_dir_entry *dirent,
 		     ino_t ino, struct problem_context *pctx)
 {
 	struct ext2_dir_entry *nextdir;
 	int	status = 0;
 	int	created = 0;
 	int	new_len;
 	int	problem = 0;

 	if (!dirent->inode)
 		problem = PR_2_MISSING_DOT;
 	else if (((dirent->name_len & 0xFF) != 1) ||
 		 (dirent->name[0] != '.'))
 		problem = PR_2_1ST_NOT_DOT;
 	else if (dirent->name[1] != '\0')
 		problem = PR_2_DOT_NULL_TERM;

 	if (problem) {
 		if (fix_problem(ctx, problem, pctx)) {
 			if (dirent->rec_len < 12)
 				dirent->rec_len = 12;
 			dirent->inode = ino;
 			dirent->name_len = 1;
 			dirent->name[0] = '.';
 			dirent->name[1] = '\0';
 			status = 1;
 			created = 1;
 		}
 	}
 	if (dirent->inode != ino) {
 		if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 			dirent->inode = ino;
 			status = 1;
 		}
 	}
 	if (dirent->rec_len > 12) {
 		new_len = dirent->rec_len - 12;
 		if (new_len > 12) {
 			if (created ||
 			    fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 				nextdir = (struct ext2_dir_entry *)
 					((char *) dirent + 12);
 				dirent->rec_len = 12;
 				nextdir->rec_len = new_len;
 				nextdir->inode = 0;
 				nextdir->name_len = 0;
 				status = 1;
 			}
 		}
 	}
 	return status;
 }

 /*
  * Make sure the second entry in the directory is '..', and that the
  * directory entry is sane.  We do not check the inode number of '..'
  * here; this gets done in pass 3.
  */
 static int check_dotdot(e2fsck_t ctx,
 			struct ext2_dir_entry *dirent,
 			struct dir_info *dir, struct problem_context *pctx)
 {
 	int		problem = 0;

 	if (!dirent->inode)
 		problem = PR_2_MISSING_DOT_DOT;
 	else if (((dirent->name_len & 0xFF) != 2) ||
 		 (dirent->name[0] != '.') ||
 		 (dirent->name[1] != '.'))
 		problem = PR_2_2ND_NOT_DOT_DOT;
 	else if (dirent->name[2] != '\0')
 		problem = PR_2_DOT_DOT_NULL_TERM;

 	if (problem) {
 		if (fix_problem(ctx, problem, pctx)) {
 			if (dirent->rec_len < 12)
 				dirent->rec_len = 12;
 			/*
 			 * Note: we don't have the parent inode just
 			 * yet, so we will fill it in with the root
 			 * inode.  This will get fixed in pass 3.
 			 */
 			dirent->inode = EXT2_ROOT_INO;
 			dirent->name_len = 2;
 			dirent->name[0] = '.';
 			dirent->name[1] = '.';
 			dirent->name[2] = '\0';
 			return 1;
 		}
 		return 0;
 	}
 	dir->dotdot = dirent->inode;
 	return 0;
 }

 /*
  * Check to make sure a directory entry doesn't contain any illegal
  * characters.
  */
 static int check_name(e2fsck_t ctx,
 		      struct ext2_dir_entry *dirent,
 		      ino_t dir_ino, struct problem_context *pctx)
 {
 	int	i;
 	int	fixup = -1;
 	int	ret = 0;

 	for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
 		if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 			if (fixup < 0) {
 				fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 			}
 			if (fixup) {
 				dirent->name[i] = '.';
 				ret = 1;
 			}
 		}
 	}
 	return ret;
 }

 static int check_dir_block(ext2_filsys fs,
 			   struct ext2_db_entry *db,
 			   void *priv_data)
 {
 	struct dir_info		*subdir, *dir;
 	struct ext2_dir_entry 	*dirent;
 	int			offset = 0;
 	int			dir_modified = 0;
 	int			dot_state;
 	blk_t			block_nr = db->blk;
 	ino_t 			ino = db->ino;
 	__u16			links;
 	struct check_dir_struct	*cd;
 	char 			*buf;
 	e2fsck_t		ctx;
 	int			problem;

 	cd = (struct check_dir_struct *) priv_data;
 	buf = cd->buf;
 	ctx = cd->ctx;

 	if (ctx->progress)
 		if ((ctx->progress)(ctx, 2, cd->count++, cd->max))
 			return DIRENT_ABORT;

 	/*
 	 * Make sure the inode is still in use (could have been
 	 * deleted in the duplicate/bad blocks pass.
 	 */
 	if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, ino)))
 		return 0;

 	cd->pctx.ino = ino;
 	cd->pctx.blk = block_nr;
 	cd->pctx.blkcount = db->blockcnt;
 	cd->pctx.ino2 = 0;
 	cd->pctx.dirent = 0;
 	cd->pctx.num = 0;

 	if (db->blk == 0) {
 		if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 			return 0;
 		block_nr = db->blk;
 	}

 	if (db->blockcnt)
 		dot_state = 2;
 	else
 		dot_state = 0;

 #if 0
 	printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 	       db->blockcnt, ino);
 #endif

 	cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
 	if (cd->pctx.errcode) {
 		if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 			ctx->flags |= E2F_FLAG_ABORT;
 			return DIRENT_ABORT;
 		}
 		memset(buf, 0, fs->blocksize);
 	}

 	do {
 		dot_state++;
 		problem = 0;
 		dirent = (struct ext2_dir_entry *) (buf + offset);
 		cd->pctx.dirent = dirent;
 		cd->pctx.num = offset;
 		if (((offset + dirent->rec_len) > fs->blocksize) ||
 		    (dirent->rec_len < 8) ||
 		    ((dirent->rec_len % 4) != 0) ||
 		    (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
 			if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
 				dirent->rec_len = fs->blocksize - offset;
 				dirent->name_len = 0;
 				dirent->inode = 0;
 				dir_modified++;
 			} else
 				return DIRENT_ABORT;
 		}
 		if ((dirent->name_len & 0xFF) > EXT2_NAME_LEN) {
 			if (fix_problem(ctx, PR_2_FILENAME_LONG, &cd->pctx)) {
 				dirent->name_len = EXT2_NAME_LEN;
 				dir_modified++;
 			}
 		}

 		if (dot_state == 1) {
 			if (check_dot(ctx, dirent, ino, &cd->pctx))
 				dir_modified++;
 		} else if (dot_state == 2) {
 			dir = e2fsck_get_dir_info(ctx, ino);
 			if (!dir) {
 				fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
 				ctx->flags |= E2F_FLAG_ABORT;
 				return DIRENT_ABORT;
 			}
 			if (check_dotdot(ctx, dirent, dir, &cd->pctx))
 				dir_modified++;
 		} else if (dirent->inode == ino) {
 			problem = PR_2_LINK_DOT;
 			if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
 				dirent->inode = 0;
 				dir_modified++;
 				goto next;
 			}
 		}
 		if (!dirent->inode)
 			goto next;

 		/*
 		 * Make sure the inode listed is a legal one.
 		 */
 		if (((dirent->inode != EXT2_ROOT_INO) &&
 		     (dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
 		    (dirent->inode > fs->super->s_inodes_count)) {
 			problem = PR_2_BAD_INO;
 		} else if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map,
 					       dirent->inode))) {
 			/*
 			 * If the inode is unused, offer to clear it.
 			 */
 			problem = PR_2_UNUSED_INODE;
 		} else if (ctx->inode_bb_map &&
 			   (ext2fs_test_inode_bitmap(ctx->inode_bb_map,
 						     dirent->inode))) {
 			/*
 			 * If the inode is in a bad block, offer to
 			 * clear it.
 			 */
 			problem = PR_2_BB_INODE;
 		} else if ((dot_state > 2) &&
 			   ((dirent->name_len & 0xFF) == 1) &&
 			   (dirent->name[0] == '.')) {
 			/*
 			 * If there's a '.' entry in anything other
 			 * than the first directory entry, it's a
 			 * duplicate entry that should be removed.
 			 */
 			problem = PR_2_DUP_DOT;
 		} else if ((dot_state > 2) &&
 			   ((dirent->name_len & 0xFF) == 2) &&
 			   (dirent->name[0] == '.') &&
 			   (dirent->name[1] == '.')) {
 			/*
 			 * If there's a '..' entry in anything other
 			 * than the second directory entry, it's a
 			 * duplicate entry that should be removed.
 			 */
 			problem = PR_2_DUP_DOT_DOT;
 		} else if ((dot_state > 2) &&
 			   (dirent->inode == EXT2_ROOT_INO)) {
 			/*
 			 * Don't allow links to the root directory.
 			 * We check this specially to make sure we
 			 * catch this error case even if the root
 			 * directory hasn't been created yet.
 			 */
 			problem = PR_2_LINK_ROOT;
 		}

 		if (problem) {
 			if (fix_problem(ctx, problem, &cd->pctx)) {
 				dirent->inode = 0;
 				dir_modified++;
 				goto next;
 			} else {
 				ext2fs_unmark_valid(fs);
 				if (problem == PR_2_BAD_INO)
 					goto next;
 			}
 		}

 		/*
 		 * If the inode was marked as having bad fields in
 		 * pass1, process it and offer to fix/clear it.
 		 * (We wait until now so that we can display the
 		 * pathname to the user.)
 		 */
 		if (ctx->inode_bad_map &&
 		    ext2fs_test_inode_bitmap(ctx->inode_bad_map,
 					     dirent->inode)) {
 			if (e2fsck_process_bad_inode(ctx, ino,
 						     dirent->inode)) {
 				dirent->inode = 0;
 				dir_modified++;
 				goto next;
 			}
 			if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 				return DIRENT_ABORT;
 		}

 		if (check_name(ctx, dirent, ino, &cd->pctx))
 			dir_modified++;

 		/*
 		 * If this is a directory, then mark its parent in its
 		 * dir_info structure.  If the parent field is already
 		 * filled in, then this directory has more than one
 		 * hard link.  We assume the first link is correct,
 		 * and ask the user if he/she wants to clear this one.
 		 */
 		if ((dot_state > 2) &&
 		    (ext2fs_test_inode_bitmap(ctx->inode_dir_map,
 					      dirent->inode))) {
 			subdir = e2fsck_get_dir_info(ctx, dirent->inode);
 			if (!subdir) {
 				cd->pctx.ino = dirent->inode;
 				fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
 				ctx->flags |= E2F_FLAG_ABORT;
 				return DIRENT_ABORT;
 			}
 			if (subdir->parent) {
 				cd->pctx.ino2 = subdir->parent;
 				if (fix_problem(ctx, PR_2_LINK_DIR,
 						&cd->pctx)) {
 					dirent->inode = 0;
 					dir_modified++;
 					goto next;
 				}
 				cd->pctx.ino2 = 0;
 			} else
 				subdir->parent = ino;
 		}

 		ext2fs_icount_increment(ctx->inode_count, dirent->inode,
 					&links);
 		if (links > 1)
 			ctx->fs_links_count++;
 		ctx->fs_total_count++;
 	next:
 		offset += dirent->rec_len;
 	} while (offset < fs->blocksize);
 #if 0
 	printf("\n");
 #endif
 	if (offset != fs->blocksize) {
 		cd->pctx.num = dirent->rec_len - fs->blocksize + offset;
 		if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
 			dirent->rec_len = cd->pctx.num;
 			dir_modified++;
 		}
 	}
 	if (dir_modified) {
 		cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
 		if (cd->pctx.errcode) {
 			if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
 					 &cd->pctx)) {
 				ctx->flags |= E2F_FLAG_ABORT;
 				return DIRENT_ABORT;
 			}
 		}
 		ext2fs_mark_changed(fs);
 	}
 	return 0;
 }

 /*
  * This function is called to deallocate a block, and is an interator
  * functioned called by deallocate inode via ext2fs_iterate_block().
  */
 static int deallocate_inode_block(ext2_filsys fs,
 			     blk_t	*block_nr,
 			     int blockcnt,
 			     void *priv_data)
 {
 	e2fsck_t	ctx = (e2fsck_t) priv_data;

 	if (!*block_nr)
 		return 0;
 	ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
 	ext2fs_unmark_block_bitmap(fs->block_map, *block_nr);
 	return 0;
 }

 /*
  * This fuction deallocates an inode
  */
 static void deallocate_inode(e2fsck_t ctx, ino_t ino,
 			     char* block_buf)
 {
 	ext2_filsys fs = ctx->fs;
 	struct ext2_inode	inode;
 	struct problem_context	pctx;

 	ext2fs_icount_store(ctx->inode_link_info, ino, 0);
 	e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
 	inode.i_links_count = 0;
 	inode.i_dtime = time(0);
 	e2fsck_write_inode(ctx, ino, &inode, "deallocate_inode");
 	clear_problem_context(&pctx);
 	pctx.ino = ino;

 	/*
 	 * Fix up the bitmaps...
 	 */
 	e2fsck_read_bitmaps(ctx);
 	ext2fs_unmark_inode_bitmap(ctx->inode_used_map, ino);
 	ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
 	if (ctx->inode_bad_map)
 		ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
 	ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
 	ext2fs_mark_ib_dirty(fs);

 	if (!ext2fs_inode_has_valid_blocks(&inode))
 		return;

 	ext2fs_mark_bb_dirty(fs);
 	pctx.errcode = ext2fs_block_iterate(fs, ino, 0, block_buf,
 					    deallocate_inode_block, ctx);
 	if (pctx.errcode) {
 		fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
 		ctx->flags |= E2F_FLAG_ABORT;
 		return;
 	}
 }

 extern int e2fsck_process_bad_inode(e2fsck_t ctx, ino_t dir, ino_t ino)
 {
 	ext2_filsys fs = ctx->fs;
 	struct ext2_inode	inode;
 	int			inode_modified = 0;
 	unsigned char		*frag, *fsize;
 	struct problem_context	pctx;
 	int	problem = 0;

 	e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");

 	clear_problem_context(&pctx);
 	pctx.ino = ino;
 	pctx.dir = dir;
 	pctx.inode = &inode;

 	if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
 	    !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
 	    !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
 	    !(LINUX_S_ISSOCK(inode.i_mode)))
 		problem = PR_2_BAD_MODE;

 	if (LINUX_S_ISCHR(inode.i_mode)
 	    && !e2fsck_pass1_check_device_inode(&inode))
 		problem = PR_2_BAD_CHAR_DEV;

 	if (LINUX_S_ISBLK(inode.i_mode)
 	    && !e2fsck_pass1_check_device_inode(&inode))
 		problem = PR_2_BAD_BLOCK_DEV;

 	if (LINUX_S_ISFIFO(inode.i_mode)
 	    && !e2fsck_pass1_check_device_inode(&inode))
 		problem = PR_2_BAD_FIFO;

 	if (LINUX_S_ISSOCK(inode.i_mode)
 	    && !e2fsck_pass1_check_device_inode(&inode))
 		problem = PR_2_BAD_SOCKET;

 	if (problem) {
 		if (fix_problem(ctx, problem, &pctx)) {
 			deallocate_inode(ctx, ino, 0);
 			if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 				return 0;
 			return 1;
 		}
 		problem = 0;
 	}

 	if (inode.i_faddr &&
 	    fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
 		inode.i_faddr = 0;
 		inode_modified++;
 	}

 	switch (fs->super->s_creator_os) {
 	    case EXT2_OS_LINUX:
 		frag = &inode.osd2.linux2.l_i_frag;
 		fsize = &inode.osd2.linux2.l_i_fsize;
 		break;
 	    case EXT2_OS_HURD:
 		frag = &inode.osd2.hurd2.h_i_frag;
 		fsize = &inode.osd2.hurd2.h_i_fsize;
 		break;
 	    case EXT2_OS_MASIX:
 		frag = &inode.osd2.masix2.m_i_frag;
 		fsize = &inode.osd2.masix2.m_i_fsize;
 		break;
 	    default:
 		frag = fsize = 0;
 	}
 	if (frag && *frag) {
 		pctx.num = *frag;
 		if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
 			*frag = 0;
 			inode_modified++;
 		}
 		pctx.num = 0;
 	}
 	if (fsize && *fsize) {
 		pctx.num = *fsize;
 		if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
 			*fsize = 0;
 			inode_modified++;
 		}
 		pctx.num = 0;
 	}

 	if (inode.i_file_acl &&
 	    fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
 		inode.i_file_acl = 0;
 		inode_modified++;
 	}
 	if (inode.i_dir_acl &&
 	    LINUX_S_ISDIR(inode.i_mode) &&
 	    fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
 		inode.i_dir_acl = 0;
 		inode_modified++;
 	}
 	if (inode_modified)
 		e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
 	return 0;
 }


 /*
  * allocate_dir_block --- this function allocates a new directory
  * 	block for a particular inode; this is done if a directory has
  * 	a "hole" in it, or if a directory has a illegal block number
  * 	that was zeroed out and now needs to be replaced.
  */
 static int allocate_dir_block(e2fsck_t ctx,
 			      struct ext2_db_entry *db,
 			      char *buf, struct problem_context *pctx)
 {
 	ext2_filsys fs = ctx->fs;
 	blk_t			blk;
 	char			*block;
 	struct ext2_inode	inode;

 	if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
 		return 1;

 	/*
 	 * Read the inode and block bitmaps in; we'll be messing with
 	 * them.
 	 */
 	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_2_ALLOC_DIRBOCK, pctx);
 		return 1;
 	}
 	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
 	 */
 	if (db->blockcnt)
 		pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
 	else
 		pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
 						     EXT2_ROOT_INO, &block);

 	if (pctx->errcode) {
 		pctx->str = "ext2fs_new_dir_block";
 		fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
 		return 1;
 	}

 	pctx->errcode = ext2fs_write_dir_block(fs, blk, block);
 	ext2fs_free_mem((void **) &block);
 	if (pctx->errcode) {
 		pctx->str = "ext2fs_write_dir_block";
 		fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
 		return 1;
 	}

 	/*
 	 * Update the inode block count
 	 */
 	e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
 	inode.i_blocks += fs->blocksize / 512;
 	if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
 		inode.i_size = (db->blockcnt+1) * fs->blocksize;
 	e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");

 	/*
 	 * Finally, update the block pointers for the inode
 	 */
 	db->blk = blk;
 	pctx->errcode = ext2fs_block_iterate(fs, db->ino, BLOCK_FLAG_HOLE,
 				      0, update_dir_block, db);
 	if (pctx->errcode) {
 		pctx->str = "ext2fs_block_iterate";
 		fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
 		return 1;
 	}

 	return 0;
 }

 /*
  * This is a helper function for allocate_dir_block().
  */
 static int update_dir_block(ext2_filsys fs,
 			    blk_t	*block_nr,
 			    int blockcnt,
 			    void *priv_data)
 {
 	struct ext2_db_entry *db;

 	db = (struct ext2_db_entry *) priv_data;
 	if (db->blockcnt == blockcnt) {
 		*block_nr = db->blk;
 		return BLOCK_CHANGED;
 	}
 	return 0;
 }
	/*
	* pass2.c --- check directory structure
	*
	* Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o
	*
	* %Begin-Header%
	* This file may be redistributed under the terms of the GNU Public
	* License.
	* %End-Header%
	*
	* Pass 2 of e2fsck iterates through all active directory inodes, and
	* applies to following tests to each directory entry in the directory
	* blocks in the inodes:
	*
	* - The length of the directory entry (rec_len) should be at
	* least 8 bytes, and no more than the remaining space
	* left in the directory block.
	* - The length of the name in the directory entry (name_len)
	* should be less than (rec_len - 8).
	* - The inode number in the directory entry should be within
	* legal bounds.
	* - The inode number should refer to a in-use inode.
	* - The first entry should be '.', and its inode should be
	* the inode of the directory.
	* - The second entry should be '..'.
	*
	* To minimize disk seek time, the directory blocks are processed in
	* sorted order of block numbers.
	*
	* Pass 2 also collects the following information:
	* - The inode numbers of the subdirectories for each directory.
	*
	* Pass 2 relies on the following information from previous passes:
	* - The directory information collected in pass 1.
	* - The inode_used_map bitmap
	* - The inode_bad_map bitmap
	* - The inode_dir_map bitmap
	*
	* Pass 2 frees the following data structures
	* - The inode_bad_map bitmap
	*/

	#include "e2fsck.h"
	#include "problem.h"

	/*
	* Keeps track of how many times an inode is referenced.
	*/
	static void deallocate_inode(e2fsck_t ctx, ino_t ino,
	char* block_buf);
	static int check_dir_block(ext2_filsys fs,
	struct ext2_db_entry *dir_blocks_info,
	void *priv_data);
	static int allocate_dir_block(e2fsck_t ctx,
	struct ext2_db_entry *dir_blocks_info,
	char buf, struct problem_context pctx);
	static int update_dir_block(ext2_filsys fs,
	blk_t *block_nr,
	int blockcnt,
	void *priv_data);

	struct check_dir_struct {
	char *buf;
	struct problem_context pctx;
	int count, max;
	e2fsck_t ctx;
	};

	void e2fsck_pass2(e2fsck_t ctx)
	{
	ext2_filsys fs = ctx->fs;
	char *buf;
	#ifdef RESOURCE_TRACK
	struct resource_track rtrack;
	#endif
	struct dir_info *dir;
	struct check_dir_struct cd;

	#ifdef RESOURCE_TRACK
	init_resource_track(&rtrack);
	#endif

	clear_problem_context(&cd.pctx);

	#ifdef MTRACE
	mtrace_print("Pass 2");
	#endif

	if (!(ctx->options & E2F_OPT_PREEN))
	fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);

	cd.pctx.errcode = ext2fs_create_icount2(fs, EXT2_ICOUNT_OPT_INCREMENT,
	0, ctx->inode_link_info,
	&ctx->inode_count);
	if (cd.pctx.errcode) {
	fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
	ctx->flags \|= E2F_FLAG_ABORT;
	return;
	}
	buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize,
	"directory scan buffer");

	/*
	* Set up the parent pointer for the root directory, if
	* present. (If the root directory is not present, we will
	* create it in pass 3.)
	*/
	dir = e2fsck_get_dir_info(ctx, EXT2_ROOT_INO);
	if (dir)
	dir->parent = EXT2_ROOT_INO;

	cd.buf = buf;
	cd.ctx = ctx;
	cd.count = 1;
	cd.max = ext2fs_dblist_count(fs->dblist);

	if (ctx->progress)
	(void) (ctx->progress)(ctx, 2, 0, cd.max);

	cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
	&cd);
	if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
	return;
	if (cd.pctx.errcode) {
	fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
	ctx->flags \|= E2F_FLAG_ABORT;
	return;
	}

	ext2fs_free_mem((void **) &buf);
	ext2fs_free_dblist(fs->dblist);

	if (ctx->inode_bad_map) {
	ext2fs_free_inode_bitmap(ctx->inode_bad_map);
	ctx->inode_bad_map = 0;
	}
	#ifdef RESOURCE_TRACK
	if (ctx->options & E2F_OPT_TIME2) {
	e2fsck_clear_progbar(ctx);
	print_resource_track("Pass 2", &rtrack);
	}
	#endif
	}

	/*
	* Make sure the first entry in the directory is '.', and that the
	* directory entry is sane.
	*/
	static int check_dot(e2fsck_t ctx,
	struct ext2_dir_entry *dirent,
	ino_t ino, struct problem_context *pctx)
	{
	struct ext2_dir_entry *nextdir;
	int status = 0;
	int created = 0;
	int new_len;
	int problem = 0;

	if (!dirent->inode)
	problem = PR_2_MISSING_DOT;
	else if (((dirent->name_len & 0xFF) != 1) \|\|
	(dirent->name[0] != '.'))
	problem = PR_2_1ST_NOT_DOT;
	else if (dirent->name[1] != '\0')
	problem = PR_2_DOT_NULL_TERM;

	if (problem) {
	if (fix_problem(ctx, problem, pctx)) {
	if (dirent->rec_len < 12)
	dirent->rec_len = 12;
	dirent->inode = ino;
	dirent->name_len = 1;
	dirent->name[0] = '.';
	dirent->name[1] = '\0';
	status = 1;
	created = 1;
	}
	}
	if (dirent->inode != ino) {
	if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
	dirent->inode = ino;
	status = 1;
	}
	}
	if (dirent->rec_len > 12) {
	new_len = dirent->rec_len - 12;
	if (new_len > 12) {
	if (created \|\|
	fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
	nextdir = (struct ext2_dir_entry *)
	((char *) dirent + 12);
	dirent->rec_len = 12;
	nextdir->rec_len = new_len;
	nextdir->inode = 0;
	nextdir->name_len = 0;
	status = 1;
	}
	}
	}
	return status;
	}

	/*
	* Make sure the second entry in the directory is '..', and that the
	* directory entry is sane. We do not check the inode number of '..'
	* here; this gets done in pass 3.
	*/
	static int check_dotdot(e2fsck_t ctx,
	struct ext2_dir_entry *dirent,
	struct dir_info dir, struct problem_context pctx)
	{
	int problem = 0;

	if (!dirent->inode)
	problem = PR_2_MISSING_DOT_DOT;
	else if (((dirent->name_len & 0xFF) != 2) \|\|
	(dirent->name[0] != '.') \|\|
	(dirent->name[1] != '.'))
	problem = PR_2_2ND_NOT_DOT_DOT;
	else if (dirent->name[2] != '\0')
	problem = PR_2_DOT_DOT_NULL_TERM;

	if (problem) {
	if (fix_problem(ctx, problem, pctx)) {
	if (dirent->rec_len < 12)
	dirent->rec_len = 12;
	/*
	* Note: we don't have the parent inode just
	* yet, so we will fill it in with the root
	* inode. This will get fixed in pass 3.
	*/
	dirent->inode = EXT2_ROOT_INO;
	dirent->name_len = 2;
	dirent->name[0] = '.';
	dirent->name[1] = '.';
	dirent->name[2] = '\0';
	return 1;
	}
	return 0;
	}
	dir->dotdot = dirent->inode;
	return 0;
	}

	/*
	* Check to make sure a directory entry doesn't contain any illegal
	* characters.
	*/
	static int check_name(e2fsck_t ctx,
	struct ext2_dir_entry *dirent,
	ino_t dir_ino, struct problem_context *pctx)
	{
	int i;
	int fixup = -1;
	int ret = 0;

	for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
	if (dirent->name[i] == '/' \|\| dirent->name[i] == '\0') {
	if (fixup < 0) {
	fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
	}
	if (fixup) {
	dirent->name[i] = '.';
	ret = 1;
	}
	}
	}
	return ret;
	}

	static int check_dir_block(ext2_filsys fs,
	struct ext2_db_entry *db,
	void *priv_data)
	{
	struct dir_info subdir, dir;
	struct ext2_dir_entry *dirent;
	int offset = 0;
	int dir_modified = 0;
	int dot_state;
	blk_t block_nr = db->blk;
	ino_t ino = db->ino;
	__u16 links;
	struct check_dir_struct *cd;
	char *buf;
	e2fsck_t ctx;
	int problem;

	cd = (struct check_dir_struct *) priv_data;
	buf = cd->buf;
	ctx = cd->ctx;

	if (ctx->progress)
	if ((ctx->progress)(ctx, 2, cd->count++, cd->max))
	return DIRENT_ABORT;

	/*
	* Make sure the inode is still in use (could have been
	* deleted in the duplicate/bad blocks pass.
	*/
	if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, ino)))
	return 0;

	cd->pctx.ino = ino;
	cd->pctx.blk = block_nr;
	cd->pctx.blkcount = db->blockcnt;
	cd->pctx.ino2 = 0;
	cd->pctx.dirent = 0;
	cd->pctx.num = 0;

	if (db->blk == 0) {
	if (allocate_dir_block(ctx, db, buf, &cd->pctx))
	return 0;
	block_nr = db->blk;
	}

	if (db->blockcnt)
	dot_state = 2;
	else
	dot_state = 0;

	#if 0
	printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
	db->blockcnt, ino);
	#endif

	cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
	if (cd->pctx.errcode) {
	if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
	ctx->flags \|= E2F_FLAG_ABORT;
	return DIRENT_ABORT;
	}
	memset(buf, 0, fs->blocksize);
	}

	do {
	dot_state++;
	problem = 0;
	dirent = (struct ext2_dir_entry *) (buf + offset);
	cd->pctx.dirent = dirent;
	cd->pctx.num = offset;
	if (((offset + dirent->rec_len) > fs->blocksize) \|\|
	(dirent->rec_len < 8) \|\|
	((dirent->rec_len % 4) != 0) \|\|
	(((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
	if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
	dirent->rec_len = fs->blocksize - offset;
	dirent->name_len = 0;
	dirent->inode = 0;
	dir_modified++;
	} else
	return DIRENT_ABORT;
	}
	if ((dirent->name_len & 0xFF) > EXT2_NAME_LEN) {
	if (fix_problem(ctx, PR_2_FILENAME_LONG, &cd->pctx)) {
	dirent->name_len = EXT2_NAME_LEN;
	dir_modified++;
	}
	}

	if (dot_state == 1) {
	if (check_dot(ctx, dirent, ino, &cd->pctx))
	dir_modified++;
	} else if (dot_state == 2) {
	dir = e2fsck_get_dir_info(ctx, ino);
	if (!dir) {
	fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
	ctx->flags \|= E2F_FLAG_ABORT;
	return DIRENT_ABORT;
	}
	if (check_dotdot(ctx, dirent, dir, &cd->pctx))
	dir_modified++;
	} else if (dirent->inode == ino) {
	problem = PR_2_LINK_DOT;
	if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
	dirent->inode = 0;
	dir_modified++;
	goto next;
	}
	}
	if (!dirent->inode)
	goto next;

	/*
	* Make sure the inode listed is a legal one.
	*/
	if (((dirent->inode != EXT2_ROOT_INO) &&
	(dirent->inode < EXT2_FIRST_INODE(fs->super))) \|\|
	(dirent->inode > fs->super->s_inodes_count)) {
	problem = PR_2_BAD_INO;
	} else if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map,
	dirent->inode))) {
	/*
	* If the inode is unused, offer to clear it.
	*/
	problem = PR_2_UNUSED_INODE;
	} else if (ctx->inode_bb_map &&
	(ext2fs_test_inode_bitmap(ctx->inode_bb_map,
	dirent->inode))) {
	/*
	* If the inode is in a bad block, offer to
	* clear it.
	*/
	problem = PR_2_BB_INODE;
	} else if ((dot_state > 2) &&
	((dirent->name_len & 0xFF) == 1) &&
	(dirent->name[0] == '.')) {
	/*
	* If there's a '.' entry in anything other
	* than the first directory entry, it's a
	* duplicate entry that should be removed.
	*/
	problem = PR_2_DUP_DOT;
	} else if ((dot_state > 2) &&
	((dirent->name_len & 0xFF) == 2) &&
	(dirent->name[0] == '.') &&
	(dirent->name[1] == '.')) {
	/*
	* If there's a '..' entry in anything other
	* than the second directory entry, it's a
	* duplicate entry that should be removed.
	*/
	problem = PR_2_DUP_DOT_DOT;
	} else if ((dot_state > 2) &&
	(dirent->inode == EXT2_ROOT_INO)) {
	/*
	* Don't allow links to the root directory.
	* We check this specially to make sure we
	* catch this error case even if the root
	* directory hasn't been created yet.
	*/
	problem = PR_2_LINK_ROOT;
	}

	if (problem) {
	if (fix_problem(ctx, problem, &cd->pctx)) {
	dirent->inode = 0;
	dir_modified++;
	goto next;
	} else {
	ext2fs_unmark_valid(fs);
	if (problem == PR_2_BAD_INO)
	goto next;
	}
	}

	/*
	* If the inode was marked as having bad fields in
	* pass1, process it and offer to fix/clear it.
	* (We wait until now so that we can display the
	* pathname to the user.)
	*/
	if (ctx->inode_bad_map &&
	ext2fs_test_inode_bitmap(ctx->inode_bad_map,
	dirent->inode)) {
	if (e2fsck_process_bad_inode(ctx, ino,
	dirent->inode)) {
	dirent->inode = 0;
	dir_modified++;
	goto next;
	}
	if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
	return DIRENT_ABORT;
	}

	if (check_name(ctx, dirent, ino, &cd->pctx))
	dir_modified++;

	/*
	* If this is a directory, then mark its parent in its
	* dir_info structure. If the parent field is already
	* filled in, then this directory has more than one
	* hard link. We assume the first link is correct,
	* and ask the user if he/she wants to clear this one.
	*/
	if ((dot_state > 2) &&
	(ext2fs_test_inode_bitmap(ctx->inode_dir_map,
	dirent->inode))) {
	subdir = e2fsck_get_dir_info(ctx, dirent->inode);
	if (!subdir) {
	cd->pctx.ino = dirent->inode;
	fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
	ctx->flags \|= E2F_FLAG_ABORT;
	return DIRENT_ABORT;
	}
	if (subdir->parent) {
	cd->pctx.ino2 = subdir->parent;
	if (fix_problem(ctx, PR_2_LINK_DIR,
	&cd->pctx)) {
	dirent->inode = 0;
	dir_modified++;
	goto next;
	}
	cd->pctx.ino2 = 0;
	} else
	subdir->parent = ino;
	}

	ext2fs_icount_increment(ctx->inode_count, dirent->inode,
	&links);
	if (links > 1)
	ctx->fs_links_count++;
	ctx->fs_total_count++;
	next:
	offset += dirent->rec_len;
	} while (offset < fs->blocksize);
	#if 0
	printf("\n");
	#endif
	if (offset != fs->blocksize) {
	cd->pctx.num = dirent->rec_len - fs->blocksize + offset;
	if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
	dirent->rec_len = cd->pctx.num;
	dir_modified++;
	}
	}
	if (dir_modified) {
	cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
	if (cd->pctx.errcode) {
	if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
	&cd->pctx)) {
	ctx->flags \|= E2F_FLAG_ABORT;
	return DIRENT_ABORT;
	}
	}
	ext2fs_mark_changed(fs);
	}
	return 0;
	}

	/*
	* This function is called to deallocate a block, and is an interator
	* functioned called by deallocate inode via ext2fs_iterate_block().
	*/
	static int deallocate_inode_block(ext2_filsys fs,
	blk_t *block_nr,
	int blockcnt,
	void *priv_data)
	{
	e2fsck_t ctx = (e2fsck_t) priv_data;

	if (!*block_nr)
	return 0;
	ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
	ext2fs_unmark_block_bitmap(fs->block_map, *block_nr);
	return 0;
	}

	/*
	* This fuction deallocates an inode
	*/
	static void deallocate_inode(e2fsck_t ctx, ino_t ino,
	char* block_buf)
	{
	ext2_filsys fs = ctx->fs;
	struct ext2_inode inode;
	struct problem_context pctx;

	ext2fs_icount_store(ctx->inode_link_info, ino, 0);
	e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
	inode.i_links_count = 0;
	inode.i_dtime = time(0);
	e2fsck_write_inode(ctx, ino, &inode, "deallocate_inode");
	clear_problem_context(&pctx);
	pctx.ino = ino;

	/*
	* Fix up the bitmaps...
	*/
	e2fsck_read_bitmaps(ctx);
	ext2fs_unmark_inode_bitmap(ctx->inode_used_map, ino);
	ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
	if (ctx->inode_bad_map)
	ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
	ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
	ext2fs_mark_ib_dirty(fs);

	if (!ext2fs_inode_has_valid_blocks(&inode))
	return;

	ext2fs_mark_bb_dirty(fs);
	pctx.errcode = ext2fs_block_iterate(fs, ino, 0, block_buf,
	deallocate_inode_block, ctx);
	if (pctx.errcode) {
	fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
	ctx->flags \|= E2F_FLAG_ABORT;
	return;
	}
	}

	extern int e2fsck_process_bad_inode(e2fsck_t ctx, ino_t dir, ino_t ino)
	{
	ext2_filsys fs = ctx->fs;
	struct ext2_inode inode;
	int inode_modified = 0;
	unsigned char frag, fsize;
	struct problem_context pctx;
	int problem = 0;

	e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");

	clear_problem_context(&pctx);
	pctx.ino = ino;
	pctx.dir = dir;
	pctx.inode = &inode;

	if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
	!LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
	!LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
	!(LINUX_S_ISSOCK(inode.i_mode)))
	problem = PR_2_BAD_MODE;

	if (LINUX_S_ISCHR(inode.i_mode)
	&& !e2fsck_pass1_check_device_inode(&inode))
	problem = PR_2_BAD_CHAR_DEV;

	if (LINUX_S_ISBLK(inode.i_mode)
	&& !e2fsck_pass1_check_device_inode(&inode))
	problem = PR_2_BAD_BLOCK_DEV;

	if (LINUX_S_ISFIFO(inode.i_mode)
	&& !e2fsck_pass1_check_device_inode(&inode))
	problem = PR_2_BAD_FIFO;

	if (LINUX_S_ISSOCK(inode.i_mode)
	&& !e2fsck_pass1_check_device_inode(&inode))
	problem = PR_2_BAD_SOCKET;

	if (problem) {
	if (fix_problem(ctx, problem, &pctx)) {
	deallocate_inode(ctx, ino, 0);
	if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
	return 0;
	return 1;
	}
	problem = 0;
	}

	if (inode.i_faddr &&
	fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
	inode.i_faddr = 0;
	inode_modified++;
	}

	switch (fs->super->s_creator_os) {
	case EXT2_OS_LINUX:
	frag = &inode.osd2.linux2.l_i_frag;
	fsize = &inode.osd2.linux2.l_i_fsize;
	break;
	case EXT2_OS_HURD:
	frag = &inode.osd2.hurd2.h_i_frag;
	fsize = &inode.osd2.hurd2.h_i_fsize;
	break;
	case EXT2_OS_MASIX:
	frag = &inode.osd2.masix2.m_i_frag;
	fsize = &inode.osd2.masix2.m_i_fsize;
	break;
	default:
	frag = fsize = 0;
	}
	if (frag && *frag) {
	pctx.num = *frag;
	if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
	*frag = 0;
	inode_modified++;
	}
	pctx.num = 0;
	}
	if (fsize && *fsize) {
	pctx.num = *fsize;
	if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
	*fsize = 0;
	inode_modified++;
	}
	pctx.num = 0;
	}

	if (inode.i_file_acl &&
	fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
	inode.i_file_acl = 0;
	inode_modified++;
	}
	if (inode.i_dir_acl &&
	LINUX_S_ISDIR(inode.i_mode) &&
	fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
	inode.i_dir_acl = 0;
	inode_modified++;
	}
	if (inode_modified)
	e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
	return 0;
	}


	/*
	* allocate_dir_block --- this function allocates a new directory
	* block for a particular inode; this is done if a directory has
	* a "hole" in it, or if a directory has a illegal block number
	* that was zeroed out and now needs to be replaced.
	*/
	static int allocate_dir_block(e2fsck_t ctx,
	struct ext2_db_entry *db,
	char buf, struct problem_context pctx)
	{
	ext2_filsys fs = ctx->fs;
	blk_t blk;
	char *block;
	struct ext2_inode inode;

	if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
	return 1;

	/*
	* Read the inode and block bitmaps in; we'll be messing with
	* them.
	*/
	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_2_ALLOC_DIRBOCK, pctx);
	return 1;
	}
	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
	*/
	if (db->blockcnt)
	pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
	else
	pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
	EXT2_ROOT_INO, &block);

	if (pctx->errcode) {
	pctx->str = "ext2fs_new_dir_block";
	fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
	return 1;
	}

	pctx->errcode = ext2fs_write_dir_block(fs, blk, block);
	ext2fs_free_mem((void **) &block);
	if (pctx->errcode) {
	pctx->str = "ext2fs_write_dir_block";
	fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
	return 1;
	}

	/*
	* Update the inode block count
	*/
	e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
	inode.i_blocks += fs->blocksize / 512;
	if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
	inode.i_size = (db->blockcnt+1) * fs->blocksize;
	e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");

	/*
	* Finally, update the block pointers for the inode
	*/
	db->blk = blk;
	pctx->errcode = ext2fs_block_iterate(fs, db->ino, BLOCK_FLAG_HOLE,
	0, update_dir_block, db);
	if (pctx->errcode) {
	pctx->str = "ext2fs_block_iterate";
	fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
	return 1;
	}

	return 0;
	}

	/*
	* This is a helper function for allocate_dir_block().
	*/
	static int update_dir_block(ext2_filsys fs,
	blk_t *block_nr,
	int blockcnt,
	void *priv_data)
	{
	struct ext2_db_entry *db;

	db = (struct ext2_db_entry *) priv_data;
	if (db->blockcnt == blockcnt) {
	*block_nr = db->blk;
	return BLOCK_CHANGED;
	}
	return 0;
	}