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pass2.c

/*
 * 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
 *    - The inode_reg_map bitmap
 */

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

#ifdef NO_INLINE_FUNCS
#define _INLINE_
#else
#define _INLINE_ inline
#endif

/*
 * Keeps track of how many times an inode is referenced.
 */
static void deallocate_inode(e2fsck_t ctx, ext2_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,
                      e2_blkcnt_t blockcnt,
                      blk_t   ref_block,
                      int           ref_offset, 
                      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)
{
      struct ext2_super_block *sb = ctx->fs->super;
      struct problem_context  pctx;
      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;
      }
      if (ctx->inode_reg_map) {
            ext2fs_free_inode_bitmap(ctx->inode_reg_map);
            ctx->inode_reg_map = 0;
      }

      clear_problem_context(&pctx);
      if (ctx->large_files) {
            if (!(sb->s_feature_ro_compat &
                  EXT2_FEATURE_RO_COMPAT_LARGE_FILE) &&
                fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
                  sb->s_feature_ro_compat |=
                        EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
                  ext2fs_mark_super_dirty(fs);
            }
            if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
                fix_problem(ctx, PR_1_FS_REV_LEVEL, &pctx)) {
                  ext2fs_update_dynamic_rev(fs);
                  ext2fs_mark_super_dirty(fs);
            }
      } else if (!ctx->large_files &&
          (sb->s_feature_ro_compat &
            EXT2_FEATURE_RO_COMPAT_LARGE_FILE)) {
            if (fs->flags & EXT2_FLAG_RW) {
                  sb->s_feature_ro_compat &= 
                        ~EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
                  ext2fs_mark_super_dirty(fs);
            }
      }
      
#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,
                 ext2_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,
                  ext2_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;
}

/*
 * Check the directory filetype (if present)
 */
static _INLINE_ int check_filetype(e2fsck_t ctx,
                  struct ext2_dir_entry *dirent,
                  ext2_ino_t dir_ino, struct problem_context *pctx)
{
      int   filetype = dirent->name_len >> 8;
      int   should_be = EXT2_FT_UNKNOWN;
      struct ext2_inode inode;

      if (!(ctx->fs->super->s_feature_incompat &
            EXT2_FEATURE_INCOMPAT_FILETYPE)) {
            if (filetype == 0 ||
                !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
                  return 0;
            dirent->name_len = dirent->name_len & 0xFF;
            return 1;
      }

      if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dirent->inode)) {
            should_be = EXT2_FT_DIR;
      } else if (ext2fs_test_inode_bitmap(ctx->inode_reg_map,
                                  dirent->inode)) {
            should_be = EXT2_FT_REG_FILE;
      } else if (ctx->inode_bad_map &&
               ext2fs_test_inode_bitmap(ctx->inode_bad_map,
                                  dirent->inode))
            should_be = 0;
      else {
            e2fsck_read_inode(ctx, dirent->inode, &inode,
                          "check_filetype");
            should_be = ext2_file_type(inode.i_mode);
      }
      if (filetype == should_be)
            return 0;
      pctx->num = should_be;

      if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
                  pctx) == 0)
            return 0;
                  
      dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
      return 1;
}


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;
      ext2_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 == EXT2_ET_DIR_CORRUPTED)
            cd->pctx.errcode = 0; /* We'll handle this ourselves */
      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 < 12) ||
                ((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;
            } else if ((dot_state > 2) &&
                     (dirent->name_len & 0xFF) == 0) {
                  /*
                   * Don't allow zero-length directory names.
                   */
                  problem = PR_2_NULL_NAME;
            }

            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 (check_filetype(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,
                          e2_blkcnt_t blockcnt,
                          blk_t ref_block,
                          int ref_offset, 
                          void *priv_data)
{
      e2fsck_t    ctx = (e2fsck_t) priv_data;
      
      if (HOLE_BLKADDR(*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, ext2_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;

      if (!LINUX_S_ISDIR(inode.i_mode) &&
          (inode.i_size_high || inode.i_size & 0x80000000UL))
            ctx->large_files--;

      if (inode.i_file_acl) {
            ext2fs_unmark_block_bitmap(ctx->block_found_map,
                                 inode.i_file_acl);
            ext2fs_unmark_block_bitmap(fs->block_map, inode.i_file_acl);
      }

      ext2fs_mark_bb_dirty(fs);
      pctx.errcode = ext2fs_block_iterate2(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, ext2_ino_t dir,
                            ext2_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;
      else if (LINUX_S_ISCHR(inode.i_mode)
             && !e2fsck_pass1_check_device_inode(&inode))
            problem = PR_2_BAD_CHAR_DEV;
      else if (LINUX_S_ISBLK(inode.i_mode)
             && !e2fsck_pass1_check_device_inode(&inode))
            problem = PR_2_BAD_BLOCK_DEV;
      else if (LINUX_S_ISFIFO(inode.i_mode)
             && !e2fsck_pass1_check_device_inode(&inode))
            problem = PR_2_BAD_FIFO;
      else if (LINUX_S_ISSOCK(inode.i_mode)
             && !e2fsck_pass1_check_device_inode(&inode))
            problem = PR_2_BAD_SOCKET;
      else if (LINUX_S_ISLNK(inode.i_mode)
             && !e2fsck_pass1_check_symlink(fs, &inode)) {
            problem = PR_2_SYMLINK_SIZE;
      }

      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 &&
          !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR) &&
          fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
            inode.i_file_acl = 0;
            inode_modified++;
      }
      if (inode.i_file_acl &&
          ((inode.i_file_acl < fs->super->s_first_data_block) ||
           (inode.i_file_acl >= fs->super->s_blocks_count)) &&
          fix_problem(ctx, PR_2_FILE_ACL_BAD, &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_iterate2(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,
                      e2_blkcnt_t blockcnt,
                      blk_t ref_block,
                      int ref_offset, 
                      void *priv_data)
{
      struct ext2_db_entry *db;

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

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