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pass1b.c

/*
 * pass1b.c --- Pass #1b of e2fsck
 *
 * This file contains pass1B, pass1C, and pass1D of e2fsck.  They are
 * only invoked if pass 1 discovered blocks which are in use by more
 * than one inode.
 * 
 * Pass1B scans the data blocks of all the inodes again, generating a
 * complete list of duplicate blocks and which inodes have claimed
 * them.
 *
 * Pass1C does a tree-traversal of the filesystem, to determine the
 * parent directories of these inodes.  This step is necessary so that
 * e2fsck can print out the pathnames of affected inodes.
 *
 * Pass1D is a reconciliation pass.  For each inode with duplicate
 * blocks, the user is prompted if s/he would like to clone the file
 * (so that the file gets a fresh copy of the duplicated blocks) or
 * simply to delete the file.
 * 
 * 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%
 * 
 */

#include <time.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#include <et/com_err.h>
#include "e2fsck.h"

#include "problem.h"

/* Define an extension to the ext2 library's block count information */
#define BLOCK_COUNT_EXTATTR   (-5)

/*
 * This is structure is allocated for each time that a block is
 * claimed by more than one file.  So if a particular block is claimed
 * by 3 files, then three copies of this structure will be allocated,
 * one for each conflict.
 *
 * The linked list structure is as follows:
 *
 * dup_blk -->  block #34  --> block #35  --> block #47
 *          inode #12      inode #14      inode #17
 *          num_bad = 3    num_bad = 2    num_bad = 2
 *            |              |               |
 *            V              V               V
 *          block #34      block #35      block #47
 *          inode #14      inode #15      inode #23
 *            |
 *            V
 *          block #34
 *          inode #15
 *
 * The num_bad field indicates how many inodes are sharing a
 * particular block, and is only stored in the first element of the
 * linked list for a particular block.  As the block conflicts are
 * resolved, num_bad is decremented; when it reaches 1, then we no
 * longer need to worry about that block.
 */
struct dup_block {
      blk_t       block;            /* Block number */
      ext2_ino_t  ino;        /* Inode number */
      int         num_bad;
      int         flags;
      /* Pointer to next dup record with different block */
      struct dup_block *next_block;
      /* Pointer to next dup record with different inode */
      struct dup_block *next_inode;
};

#define FLAG_EXTATTR    (1)

/*
 * This structure stores information about a particular inode which
 * is sharing blocks with other inodes.  This information is collected
 * to display to the user, so that the user knows what files he or she
 * is dealing with, when trying to decide how to resolve the conflict
 * of multiply-claimed blocks.
 */
struct dup_inode {
      ext2_ino_t        ino, dir;
      int               num_dupblocks;
      struct ext2_inode inode;
      struct dup_inode  *next;
};

static int process_pass1b_block(ext2_filsys fs, blk_t *blocknr,
                        e2_blkcnt_t blockcnt, blk_t ref_blk, 
                        int ref_offset, void *priv_data);
static void delete_file(e2fsck_t ctx, struct dup_inode *dp,
                  char *block_buf);
static int clone_file(e2fsck_t ctx, struct dup_inode *dp, char* block_buf);
static int check_if_fs_block(e2fsck_t ctx, blk_t test_blk);

static void pass1b(e2fsck_t ctx, char *block_buf);
static void pass1c(e2fsck_t ctx, char *block_buf);
static void pass1d(e2fsck_t ctx, char *block_buf);

static struct dup_block *dup_blk = 0;
static struct dup_inode *dup_ino = 0;
static int dup_inode_count = 0;

static ext2fs_inode_bitmap inode_dup_map;

/*
 * Main procedure for handling duplicate blocks
 */
void e2fsck_pass1_dupblocks(e2fsck_t ctx, char *block_buf)
{
      ext2_filsys             fs = ctx->fs;
      struct dup_block  *p, *q, *next_p, *next_q;
      struct dup_inode  *r, *next_r;
      struct problem_context  pctx;

      clear_problem_context(&pctx);
      
      pctx.errcode = ext2fs_allocate_inode_bitmap(fs,
                  _("multiply claimed inode map"), &inode_dup_map);
      if (pctx.errcode) {
            fix_problem(ctx, PR_1B_ALLOCATE_IBITMAP_ERROR, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }
      
      pass1b(ctx, block_buf);
      pass1c(ctx, block_buf);
      pass1d(ctx, block_buf);

      /*
       * Time to free all of the accumulated data structures that we
       * don't need anymore.
       */
      ext2fs_free_inode_bitmap(inode_dup_map); inode_dup_map = 0;
      ext2fs_free_block_bitmap(ctx->block_dup_map); ctx->block_dup_map = 0;
      for (p = dup_blk; p; p = next_p) {
            next_p = p->next_block;
            for (q = p; q; q = next_q) {
                  next_q = q->next_inode;
                  ext2fs_free_mem((void **) &q);
            }
      }
      for (r = dup_ino; r; r = next_r) {
            next_r = r->next;
            ext2fs_free_mem((void **) &r);
      }
}

/*
 * Scan the inodes looking for inodes that contain duplicate blocks.
 */
struct process_block_struct {
      ext2_ino_t  ino;
      int         dup_blocks;
      e2fsck_t    ctx;
      struct problem_context *pctx;
};

static void pass1b(e2fsck_t ctx, char *block_buf)
{
      ext2_filsys fs = ctx->fs;
      ext2_ino_t ino;
      struct ext2_inode inode;
      ext2_inode_scan   scan;
      struct process_block_struct pb;
      struct dup_inode *dp;
      struct dup_block *q, *r;
      struct problem_context pctx;
      int   i, ea_flag;
      
      clear_problem_context(&pctx);
      
      fix_problem(ctx, PR_1B_PASS_HEADER, &pctx);
      pctx.errcode = ext2fs_open_inode_scan(fs, ctx->inode_buffer_blocks,
                                    &scan);
      if (pctx.errcode) {
            fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }
      pctx.errcode = ext2fs_get_next_inode(scan, &ino, &inode);
      if (pctx.errcode) {
            fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }
      ctx->stashed_inode = &inode;
      pb.ctx = ctx;
      pb.pctx = &pctx;
      pctx.str = "pass1b";
      while (ino) {
            pctx.ino = ctx->stashed_ino = ino;
            if ((ino != EXT2_BAD_INO) &&
                (!ext2fs_test_inode_bitmap(ctx->inode_used_map, ino) ||
                 !ext2fs_inode_has_valid_blocks(&inode)))
                  goto next;

            pb.ino = ino;
            pb.dup_blocks = 0;
            pctx.errcode = ext2fs_block_iterate2(fs, ino, 0, block_buf,
                                    process_pass1b_block, &pb);
            if (inode.i_file_acl)
                  process_pass1b_block(fs, &inode.i_file_acl,
                                   BLOCK_COUNT_EXTATTR, 0, 0, &pb);
            if (pb.dup_blocks) {
                  end_problem_latch(ctx, PR_LATCH_DBLOCK);
                  dp = (struct dup_inode *) e2fsck_allocate_memory(ctx,
                            sizeof(struct dup_inode),
                            "duplicate inode record");
                  dp->ino = ino;
                  dp->dir = 0;
                  dp->inode = inode;
                  dp->num_dupblocks = pb.dup_blocks;
                  dp->next = dup_ino;
                  dup_ino = dp;
                  if (ino != EXT2_BAD_INO)
                        dup_inode_count++;
            }
            if (pctx.errcode)
                  fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
      next:
            pctx.errcode = ext2fs_get_next_inode(scan, &ino, &inode);
            if (pctx.errcode == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
                  goto next;
            if (pctx.errcode) {
                  fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
                  ctx->flags |= E2F_FLAG_ABORT;
                  return;
            }
      }
      ext2fs_close_inode_scan(scan);
      e2fsck_use_inode_shortcuts(ctx, 0);
      /*
       * Set the num_bad field
       */
      for (q = dup_blk; q; q = q->next_block) {
            i = 0;
            ea_flag = 0;
            for (r = q; r; r = r->next_inode) {
                  if (r->flags & FLAG_EXTATTR) {
                        if (ea_flag++)
                              continue;
                  }
                  i++;
            }
            q->num_bad = i;
      }
}

static int process_pass1b_block(ext2_filsys fs,
                        blk_t *block_nr,
                        e2_blkcnt_t blockcnt,
                        blk_t ref_blk, 
                        int ref_offset,                
                        void *priv_data)
{
      struct process_block_struct *p;
      struct dup_block *dp, *q;
      e2fsck_t ctx;

      if (HOLE_BLKADDR(*block_nr))
            return 0;
      p = (struct process_block_struct *) priv_data;
      ctx = p->ctx;
      
      if (ext2fs_test_block_bitmap(ctx->block_dup_map, *block_nr)) {
            /* OK, this is a duplicate block */
            if (p->ino != EXT2_BAD_INO) {
                  p->pctx->blk = *block_nr;
                  fix_problem(ctx, PR_1B_DUP_BLOCK, p->pctx);
            }
            p->dup_blocks++;
            ext2fs_mark_block_bitmap(ctx->block_dup_map, *block_nr);
            ext2fs_mark_inode_bitmap(inode_dup_map, p->ino);
            dp = (struct dup_block *) e2fsck_allocate_memory(ctx,
                                  sizeof(struct dup_block),
                                  "duplicate block record");
            dp->block = *block_nr;
            dp->ino = p->ino;
            dp->num_bad = 0;
            dp->flags = (blockcnt == BLOCK_COUNT_EXTATTR) ?
                  FLAG_EXTATTR : 0;
            q = dup_blk;
            while (q) {
                  if (q->block == *block_nr)
                        break;
                  q = q->next_block;
            }
            if (q) {
                  dp->next_inode = q->next_inode;
                  q->next_inode = dp;
            } else {
                  dp->next_block = dup_blk;
                  dup_blk = dp;
            }
      }
      return 0;
}

/*
 * Pass 1c: Scan directories for inodes with duplicate blocks.  This
 * is used so that we can print pathnames when prompting the user for
 * what to do.
 */
struct search_dir_struct {
      int         count;
      ext2_ino_t  first_inode;
      ext2_ino_t  max_inode;
};

static int search_dirent_proc(ext2_ino_t dir, int entry,
                        struct ext2_dir_entry *dirent,
                        int offset, int blocksize,
                        char *buf, void *priv_data)
{
      struct search_dir_struct *sd;
      struct dup_inode  *p;

      sd = (struct search_dir_struct *) priv_data;

      if (dirent->inode > sd->max_inode)
            /* Should abort this inode, but not everything */
            return 0;   

      if (!dirent->inode || (entry < DIRENT_OTHER_FILE) ||
          !ext2fs_test_inode_bitmap(inode_dup_map, dirent->inode))
            return 0;

      for (p = dup_ino; p; p = p->next) {
            if ((p->ino >= sd->first_inode) && 
                (p->ino == dirent->inode))
                  break;
      }

      if (!p || p->dir)
            return 0;

      p->dir = dir;
      sd->count--;

      return(sd->count ? 0 : DIRENT_ABORT);
}


static void pass1c(e2fsck_t ctx, char *block_buf)
{
      ext2_filsys fs = ctx->fs;
      struct dup_inode  *p;
      int   inodes_left = dup_inode_count;
      struct search_dir_struct sd;
      struct problem_context pctx;

      clear_problem_context(&pctx);

      fix_problem(ctx, PR_1C_PASS_HEADER, &pctx);

      /*
       * First check to see if any of the inodes with dup blocks is
       * a special inode.  (Note that the bad block inode isn't
       * counted.)
       */
      for (p = dup_ino; p; p = p->next) {
            if ((p->ino < EXT2_FIRST_INODE(fs->super)) &&
                (p->ino != EXT2_BAD_INO))
                  inodes_left--;
      }

      /*
       * Search through all directories to translate inodes to names
       * (by searching for the containing directory for that inode.)
       */
      sd.count = inodes_left;
      sd.first_inode = EXT2_FIRST_INODE(fs->super);
      sd.max_inode = fs->super->s_inodes_count;
      ext2fs_dblist_dir_iterate(fs->dblist, 0, block_buf,
                          search_dirent_proc, &sd);
}     

static void pass1d(e2fsck_t ctx, char *block_buf)
{
      ext2_filsys fs = ctx->fs;
      struct dup_inode  *p, *s;
      struct dup_block  *q, *r;
      ext2_ino_t        *shared;
      int   shared_len;
      int   i;
      int   file_ok;
      int   meta_data = 0;
      struct problem_context pctx;

      clear_problem_context(&pctx);
      
      fix_problem(ctx, PR_1D_PASS_HEADER, &pctx);
      e2fsck_read_bitmaps(ctx);

      pctx.num = dup_inode_count;
      fix_problem(ctx, PR_1D_NUM_DUP_INODES, &pctx);
      shared = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
                        sizeof(ext2_ino_t) * dup_inode_count,
                        "Shared inode list");
      for (p = dup_ino; p; p = p->next) {
            shared_len = 0;
            file_ok = 1;
            if (p->ino == EXT2_BAD_INO)
                  continue;

            /*
             * Search through the duplicate records to see which
             * inodes share blocks with this one
             */
            for (q = dup_blk; q; q = q->next_block) {
                  /*
                   * See if this block is used by this inode.
                   * If it isn't, continue.
                   */
                  for (r = q; r; r = r->next_inode)
                        if (r->ino == p->ino)
                              break;
                  if (!r)
                        continue;
                  if (q->num_bad > 1)
                        file_ok = 0;
                  if (check_if_fs_block(ctx, q->block)) {
                        file_ok = 0;
                        meta_data = 1;
                  }
                  
                  /*
                   * Add all inodes used by this block to the
                   * shared[] --- which is a unique list, so
                   * if an inode is already in shared[], don't
                   * add it again.
                   */
                  for (r = q; r; r = r->next_inode) {
                        if (r->ino == p->ino)
                              continue;
                        for (i = 0; i < shared_len; i++)
                              if (shared[i] == r->ino)
                                    break;
                        if (i == shared_len) {
                              shared[shared_len++] = r->ino;
                        }
                  }
            }

            /*
             * Report the inode that we are working on
             */
            pctx.inode = &p->inode;
            pctx.ino = p->ino;
            pctx.dir = p->dir;
            pctx.blkcount = p->num_dupblocks;
            pctx.num = meta_data ? shared_len+1 : shared_len;
            fix_problem(ctx, PR_1D_DUP_FILE, &pctx);
            pctx.blkcount = 0;
            pctx.num = 0;
            
            if (meta_data)
                  fix_problem(ctx, PR_1D_SHARE_METADATA, &pctx);
            
            for (i = 0; i < shared_len; i++) {
                  for (s = dup_ino; s; s = s->next)
                        if (s->ino == shared[i])
                              break;
                  if (!s)
                        continue;
                  /*
                   * Report the inode that we are sharing with
                   */
                  pctx.inode = &s->inode;
                  pctx.ino = s->ino;
                  pctx.dir = s->dir;
                  fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
            }
            if (file_ok) {
                  fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
                  continue;
            }
            if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
                  pctx.errcode = clone_file(ctx, p, block_buf);
                  if (pctx.errcode)
                        fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
                  else
                        continue;
            }
            if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
                  delete_file(ctx, p, block_buf);
            else
                  ext2fs_unmark_valid(fs);
      }
      ext2fs_free_mem((void **) &shared);
}

/*
 * Drop the refcount on the dup_block structure, and clear the entry
 * in the block_dup_map if appropriate.
 */
static void decrement_badcount(e2fsck_t ctx, struct dup_block *p)
{
      p->num_bad--;
      if (p->num_bad <= 0 ||
          (p->num_bad == 1 && !check_if_fs_block(ctx, p->block)))
            ext2fs_unmark_block_bitmap(ctx->block_dup_map, p->block);
}

static int delete_file_block(ext2_filsys fs,
                       blk_t  *block_nr,
                       e2_blkcnt_t blockcnt,
                       blk_t ref_block,
                       int ref_offset, 
                       void *priv_data)
{
      struct process_block_struct *pb;
      struct dup_block *p;
      e2fsck_t ctx;

      pb = (struct process_block_struct *) priv_data;
      ctx = pb->ctx;

      if (HOLE_BLKADDR(*block_nr))
            return 0;

      if (ext2fs_test_block_bitmap(ctx->block_dup_map, *block_nr)) {
            for (p = dup_blk; p; p = p->next_block)
                  if (p->block == *block_nr)
                        break;
            if (p) {
                  decrement_badcount(ctx, p);
            } else
                  com_err("delete_file_block", 0,
                      _("internal error; can't find dup_blk for %d\n"),
                        *block_nr);
      } else {
            ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
            ext2fs_unmark_block_bitmap(fs->block_map, *block_nr);
      }
            
      return 0;
}
            
static void delete_file(e2fsck_t ctx, struct dup_inode *dp, char* block_buf)
{
      ext2_filsys fs = ctx->fs;
      struct process_block_struct pb;
      struct ext2_inode inode;
      struct problem_context  pctx;

      clear_problem_context(&pctx);
      pctx.ino = pb.ino = dp->ino;
      pb.dup_blocks = dp->num_dupblocks;
      pb.ctx = ctx;
      pctx.str = "delete_file";

      pctx.errcode = ext2fs_block_iterate2(fs, dp->ino, 0, block_buf,
                               delete_file_block, &pb);
      if (pctx.errcode)
            fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
      ext2fs_unmark_inode_bitmap(ctx->inode_used_map, dp->ino);
      ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, dp->ino);
      if (ctx->inode_bad_map)
            ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, dp->ino);
      ext2fs_unmark_inode_bitmap(fs->inode_map, dp->ino);
      ext2fs_mark_ib_dirty(fs);
      ext2fs_mark_bb_dirty(fs);
      e2fsck_read_inode(ctx, dp->ino, &inode, "delete_file");
      inode.i_links_count = 0;
      inode.i_dtime = time(0);
      if (inode.i_file_acl)
            delete_file_block(fs, &inode.i_file_acl,
                          BLOCK_COUNT_EXTATTR, 0, 0, &pb);
      e2fsck_write_inode(ctx, dp->ino, &inode, "delete_file");
}

struct clone_struct {
      errcode_t   errcode;
      ext2_ino_t  dir;
      char  *buf;
      e2fsck_t ctx;
};

static int clone_file_block(ext2_filsys fs,
                      blk_t   *block_nr,
                      e2_blkcnt_t blockcnt,
                      blk_t ref_block,
                      int ref_offset, 
                      void *priv_data)
{
      struct dup_block *p;
      blk_t new_block;
      errcode_t   retval;
      struct clone_struct *cs = (struct clone_struct *) priv_data;
      e2fsck_t ctx;

      ctx = cs->ctx;
      
      if (HOLE_BLKADDR(*block_nr))
            return 0;

      if (ext2fs_test_block_bitmap(ctx->block_dup_map, *block_nr)) {
            for (p = dup_blk; p; p = p->next_block)
                  if (p->block == *block_nr)
                        break;
            if (p) {
                  retval = ext2fs_new_block(fs, 0, ctx->block_found_map,
                                      &new_block);
                  if (retval) {
                        cs->errcode = retval;
                        return BLOCK_ABORT;
                  }
                  if (cs->dir && (blockcnt >= 0)) {
                        retval = ext2fs_set_dir_block(fs->dblist,
                              cs->dir, new_block, blockcnt);
                        if (retval) {
                              cs->errcode = retval;
                              return BLOCK_ABORT;
                        }
                  }
#if 0
                  printf("Cloning block %u to %u\n", *block_nr,
                         new_block);
#endif
                  retval = io_channel_read_blk(fs->io, *block_nr, 1,
                                         cs->buf);
                  if (retval) {
                        cs->errcode = retval;
                        return BLOCK_ABORT;
                  }
                  retval = io_channel_write_blk(fs->io, new_block, 1,
                                          cs->buf);
                  if (retval) {
                        cs->errcode = retval;
                        return BLOCK_ABORT;
                  }
                  decrement_badcount(ctx, p);
                  *block_nr = new_block;
                  ext2fs_mark_block_bitmap(ctx->block_found_map,
                                     new_block);
                  ext2fs_mark_block_bitmap(fs->block_map, new_block);
                  return BLOCK_CHANGED;
            } else
                  com_err("clone_file_block", 0,
                      _("internal error; can't find dup_blk for %d\n"),
                        *block_nr);
      }
      return 0;
}
            
static int clone_file(e2fsck_t ctx, struct dup_inode *dp, char* block_buf)
{
      ext2_filsys fs = ctx->fs;
      errcode_t   retval;
      struct clone_struct cs;
      struct problem_context  pctx;
      blk_t       blk;

      clear_problem_context(&pctx);
      cs.errcode = 0;
      cs.dir = 0;
      cs.ctx = ctx;
      retval = ext2fs_get_mem(fs->blocksize, (void **) &cs.buf);
      if (retval)
            return retval;

      if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dp->ino))
            cs.dir = dp->ino;

      pctx.ino = dp->ino;
      pctx.str = "clone_file";
      pctx.errcode = ext2fs_block_iterate2(fs, dp->ino, 0, block_buf,
                              clone_file_block, &cs);
      ext2fs_mark_bb_dirty(fs);
      if (pctx.errcode) {
            fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
            retval = pctx.errcode;
            goto errout;
      }
      if (cs.errcode) {
            com_err("clone_file", cs.errcode,
                  _("returned from clone_file_block"));
            retval = cs.errcode;
            goto errout;
      }
      blk = dp->inode.i_file_acl;
      if (blk && (clone_file_block(fs, &dp->inode.i_file_acl,
                             BLOCK_COUNT_EXTATTR, 0, 0, &cs) ==
                BLOCK_CHANGED)) {
            struct dup_block *p, *q;
            struct dup_inode *r;

            /*
             * If we cloned the EA block, find all other inodes
             * which refered to that EA block, and modify
             * them to point to the new EA block.
             */
            for (p = dup_blk; p; p = p->next_block) {
                  if (p->block == blk)
                        break;
            }
            for (q = p; q ; q = q->next_inode) {
                  if (!(q->flags & FLAG_EXTATTR))
                        continue;
                  for (r = dup_ino; r; r = r->next)
                        if (r->ino == q->ino)
                              break;
                  if (r) {
                        r->inode.i_file_acl = dp->inode.i_file_acl;
                        e2fsck_write_inode(ctx, q->ino, &r->inode,
                                       "clone file EA");
                  }
                  q->ino = 0; /* Should free the structure... */
                  decrement_badcount(ctx, p);
            }
      }
      retval = 0;
errout:
      ext2fs_free_mem((void **) &cs.buf);
      return retval;
}

/*
 * This routine returns 1 if a block overlaps with one of the superblocks,
 * group descriptors, inode bitmaps, or block bitmaps.
 */
static int check_if_fs_block(e2fsck_t ctx, blk_t test_block)
{
      ext2_filsys fs = ctx->fs;
      blk_t block;
      int   i;
      
      block = fs->super->s_first_data_block;
      for (i = 0; i < fs->group_desc_count; i++) {

            /* Check superblocks/block group descriptros */
            if (ext2fs_bg_has_super(fs, i)) {
                  if (test_block >= block &&
                      (test_block <= block + fs->desc_blocks))
                        return 1;
            }
            
            /* Check the inode table */
            if ((fs->group_desc[i].bg_inode_table) &&
                (test_block >= fs->group_desc[i].bg_inode_table) &&
                (test_block < (fs->group_desc[i].bg_inode_table +
                           fs->inode_blocks_per_group)))
                  return 1;

            /* Check the bitmap blocks */
            if ((test_block == fs->group_desc[i].bg_block_bitmap) ||
                (test_block == fs->group_desc[i].bg_inode_bitmap))
                  return 1;
            
            block += fs->super->s_blocks_per_group;
      }
      return 0;
}

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