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super.c

/*
 * e2fsck.c - superblock checks
 * 
 * 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%
 */

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

#ifndef EXT2_SKIP_UUID
#include "uuid/uuid.h"
#endif
#include "e2fsck.h"
#include "problem.h"

#define MIN_CHECK 1
#define MAX_CHECK 2

static void check_super_value(e2fsck_t ctx, const char *descr,
                        unsigned long value, int flags,
                        unsigned long min_val, unsigned long max_val)
{
      struct            problem_context pctx;

      if (((flags & MIN_CHECK) && (value < min_val)) ||
          ((flags & MAX_CHECK) && (value > max_val))) {
            clear_problem_context(&pctx);
            pctx.num = value;
            pctx.str = descr;
            fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
            ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
      }
}

/*
 * helper function to release an inode
 */
struct process_block_struct {
      e2fsck_t    ctx;
      char        *buf;
      struct problem_context *pctx;
      int         truncating;
      int         truncate_offset;
      e2_blkcnt_t truncate_block;
      int         truncated_blocks;
      int         abort;
      errcode_t   errcode;
};

static int release_inode_block(ext2_filsys fs,
                         blk_t      *block_nr,
                         e2_blkcnt_t blockcnt,
                         blk_t      ref_blk EXT2FS_ATTR((unused)),
                         int  ref_offset EXT2FS_ATTR((unused)),
                         void *priv_data)
{
      struct process_block_struct *pb;
      e2fsck_t          ctx;
      struct problem_context  *pctx;
      blk_t             blk = *block_nr;
      int               retval = 0;

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

      pctx->blk = blk;
      pctx->blkcount = blockcnt;

      if (HOLE_BLKADDR(blk))
            return 0;

      if ((blk < fs->super->s_first_data_block) ||
          (blk >= fs->super->s_blocks_count)) {
            fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
      return_abort:
            pb->abort = 1;
            return BLOCK_ABORT;
      }

      if (!ext2fs_test_block_bitmap(fs->block_map, blk)) {
            fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
            goto return_abort;
      }

      /*
       * If we are deleting an orphan, then we leave the fields alone.
       * If we are truncating an orphan, then update the inode fields
       * and clean up any partial block data.
       */
      if (pb->truncating) {
            /*
             * We only remove indirect blocks if they are
             * completely empty.
             */
            if (blockcnt < 0) {
                  int   i, limit;
                  blk_t *bp;
                  
                  pb->errcode = io_channel_read_blk(fs->io, blk, 1,
                                          pb->buf);
                  if (pb->errcode)
                        goto return_abort;

                  limit = fs->blocksize >> 2;
                  for (i = 0, bp = (blk_t *) pb->buf;
                       i < limit;    i++, bp++)
                        if (*bp)
                              return 0;
            }
            /*
             * We don't remove direct blocks until we've reached
             * the truncation block.
             */
            if (blockcnt >= 0 && blockcnt < pb->truncate_block)
                  return 0;
            /*
             * If part of the last block needs truncating, we do
             * it here.
             */
            if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
                  pb->errcode = io_channel_read_blk(fs->io, blk, 1,
                                          pb->buf);
                  if (pb->errcode)
                        goto return_abort;
                  memset(pb->buf + pb->truncate_offset, 0,
                         fs->blocksize - pb->truncate_offset);
                  pb->errcode = io_channel_write_blk(fs->io, blk, 1,
                                           pb->buf);
                  if (pb->errcode)
                        goto return_abort;
            }
            pb->truncated_blocks++;
            *block_nr = 0;
            retval |= BLOCK_CHANGED;
      }
      
      ext2fs_block_alloc_stats(fs, blk, -1);
      return retval;
}
            
/*
 * This function releases an inode.  Returns 1 if an inconsistency was
 * found.  If the inode has a link count, then it is being truncated and
 * not deleted.
 */
static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
                        struct ext2_inode *inode, char *block_buf,
                        struct problem_context *pctx)
{
      struct process_block_struct   pb;
      ext2_filsys             fs = ctx->fs;
      errcode_t               retval;
      __u32                   count;

      if (!ext2fs_inode_has_valid_blocks(inode))
            return 0;

      pb.buf = block_buf + 3 * ctx->fs->blocksize;
      pb.ctx = ctx;
      pb.abort = 0;
      pb.errcode = 0;
      pb.pctx = pctx;
      if (inode->i_links_count) {
            pb.truncating = 1;
            pb.truncate_block = (e2_blkcnt_t)
                  ((((long long)inode->i_size_high << 32) +
                    inode->i_size + fs->blocksize - 1) /
                   fs->blocksize);
            pb.truncate_offset = inode->i_size % fs->blocksize;
      } else {
            pb.truncating = 0;
            pb.truncate_block = 0;
            pb.truncate_offset = 0;
      }
      pb.truncated_blocks = 0;
      retval = ext2fs_block_iterate2(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, 
                              block_buf, release_inode_block, &pb);
      if (retval) {
            com_err("release_inode_blocks", retval,
                  _("while calling ext2fs_block_iterate for inode %d"),
                  ino);
            return 1;
      }
      if (pb.abort)
            return 1;

      /* Refresh the inode since ext2fs_block_iterate may have changed it */
      e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");

      if (pb.truncated_blocks)
            inode->i_blocks -= pb.truncated_blocks *
                  (fs->blocksize / 512);

      if (inode->i_file_acl) {
            retval = ext2fs_adjust_ea_refcount(fs, inode->i_file_acl,
                                       block_buf, -1, &count);
            if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
                  retval = 0;
                  count = 1;
            }
            if (retval) {
                  com_err("release_inode_blocks", retval,
            _("while calling ext2fs_adjust_ea_refcount for inode %d"),
                        ino);
                  return 1;
            }
            if (count == 0)
                  ext2fs_block_alloc_stats(fs, inode->i_file_acl, -1);
            inode->i_file_acl = 0;
      }
      return 0;
}

/*
 * This function releases all of the orphan inodes.  It returns 1 if
 * it hit some error, and 0 on success.
 */
static int release_orphan_inodes(e2fsck_t ctx)
{
      ext2_filsys fs = ctx->fs;
      ext2_ino_t  ino, next_ino;
      struct ext2_inode inode;
      struct problem_context pctx;
      char *block_buf;

      if ((ino = fs->super->s_last_orphan) == 0)
            return 0;

      /*
       * Win or lose, we won't be using the head of the orphan inode
       * list again.
       */
      fs->super->s_last_orphan = 0;
      ext2fs_mark_super_dirty(fs);

      /*
       * If the filesystem contains errors, don't run the orphan
       * list, since the orphan list can't be trusted; and we're
       * going to be running a full e2fsck run anyway...
       */
      if (fs->super->s_state & EXT2_ERROR_FS)
            return 0;
      
      if ((ino < EXT2_FIRST_INODE(fs->super)) ||
          (ino > fs->super->s_inodes_count)) {
            clear_problem_context(&pctx);
            pctx.ino = ino;
            fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
            return 1;
      }

      block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
                                        "block iterate buffer");
      e2fsck_read_bitmaps(ctx);
      
      while (ino) {
            e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
            clear_problem_context(&pctx);
            pctx.ino = ino;
            pctx.inode = &inode;
            pctx.str = inode.i_links_count ? _("Truncating") :
                  _("Clearing");

            fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);

            next_ino = inode.i_dtime;
            if (next_ino &&
                ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
                 (next_ino > fs->super->s_inodes_count))) {
                  pctx.ino = next_ino;
                  fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
                  goto return_abort;
            }

            if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
                  goto return_abort;

            if (!inode.i_links_count) {
                  ext2fs_inode_alloc_stats2(fs, ino, -1,
                                      LINUX_S_ISDIR(inode.i_mode));
                  inode.i_dtime = ctx->now;
            } else {
                  inode.i_dtime = 0;
            }
            e2fsck_write_inode(ctx, ino, &inode, "delete_file");
            ino = next_ino;
      }
      ext2fs_free_mem(&block_buf);
      return 0;
return_abort:
      ext2fs_free_mem(&block_buf);
      return 1;
}

/*
 * Check the resize inode to make sure it is sane.  We check both for
 * the case where on-line resizing is not enabled (in which case the
 * resize inode should be cleared) as well as the case where on-line
 * resizing is enabled.
 */
static void check_resize_inode(e2fsck_t ctx)
{
      ext2_filsys fs = ctx->fs;
      struct ext2_inode inode;
      struct problem_context  pctx;
      int         i, gdt_off, ind_off;
      dgrp_t            j;
      blk_t       blk, pblk, expect;
      __u32             *dind_buf = 0, *ind_buf;
      errcode_t   retval;

      clear_problem_context(&pctx);

      /* 
       * If the resize inode feature isn't set, then 
       * s_reserved_gdt_blocks must be zero.
       */
      if (!(fs->super->s_feature_compat & 
            EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
            if (fs->super->s_reserved_gdt_blocks) {
                  pctx.num = fs->super->s_reserved_gdt_blocks;
                  if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
                              &pctx)) {
                        fs->super->s_reserved_gdt_blocks = 0;
                        ext2fs_mark_super_dirty(fs);
                  }
            }
      }

      /* Read the resize inode */
      pctx.ino = EXT2_RESIZE_INO;
      retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
      if (retval) {
            if (fs->super->s_feature_compat & 
                EXT2_FEATURE_COMPAT_RESIZE_INODE)
                  ctx->flags |= E2F_FLAG_RESIZE_INODE;
            return;
      }

      /* 
       * If the resize inode feature isn't set, check to make sure 
       * the resize inode is cleared; then we're done.
       */
      if (!(fs->super->s_feature_compat & 
            EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
            for (i=0; i < EXT2_N_BLOCKS; i++) {
                  if (inode.i_block[i])
                        break;
            }
            if ((i < EXT2_N_BLOCKS) &&
                fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
                  memset(&inode, 0, sizeof(inode));
                  e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
                                 "clear_resize");
            }
            return;
      }

      /* 
       * The resize inode feature is enabled; check to make sure the
       * only block in use is the double indirect block
       */
      blk = inode.i_block[EXT2_DIND_BLOCK];
      for (i=0; i < EXT2_N_BLOCKS; i++) {
            if (i != EXT2_DIND_BLOCK && inode.i_block[i])
                  break;
      }
      if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
          !(inode.i_mode & LINUX_S_IFREG) ||
          (blk < fs->super->s_first_data_block ||
           blk >= fs->super->s_blocks_count)) {
      resize_inode_invalid:
            if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
                  memset(&inode, 0, sizeof(inode));
                  e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
                                 "clear_resize");
                  ctx->flags |= E2F_FLAG_RESIZE_INODE;
            }
            if (!(ctx->options & E2F_OPT_READONLY)) {
                  fs->super->s_state &= ~EXT2_VALID_FS;
                  ext2fs_mark_super_dirty(fs);
            }
            goto cleanup;
      }
      dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
                                        "resize dind buffer");
      ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);

      retval = ext2fs_read_ind_block(fs, blk, dind_buf);
      if (retval)
            goto resize_inode_invalid;

      gdt_off = fs->desc_blocks;
      pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
      for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4; 
           i++, gdt_off++, pblk++) {
            gdt_off %= fs->blocksize/4;
            if (dind_buf[gdt_off] != pblk)
                  goto resize_inode_invalid;
            retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
            if (retval) 
                  goto resize_inode_invalid;
            ind_off = 0;
            for (j = 1; j < fs->group_desc_count; j++) {
                  if (!ext2fs_bg_has_super(fs, j))
                        continue;
                  expect = pblk + (j * fs->super->s_blocks_per_group);
                  if (ind_buf[ind_off] != expect)
                        goto resize_inode_invalid;
                  ind_off++;
            }
      }

cleanup:
      if (dind_buf)
            ext2fs_free_mem(&dind_buf);

 }

/*
 * This function checks the dirhash signed/unsigned hint if necessary.
 */
static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
{
      struct ext2_super_block *sb = ctx->fs->super;
      struct problem_context pctx;
      char  c;

      if ((ctx->options & E2F_OPT_READONLY) ||
          !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
          (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
            return;

      c = (char) 255;

      clear_problem_context(&pctx);
      if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
            if (((int) c) == -1) {
                  sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
            } else {
                  sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
            }
            ext2fs_mark_super_dirty(ctx->fs);
      }
}


void check_super_block(e2fsck_t ctx)
{
      ext2_filsys fs = ctx->fs;
      blk_t first_block, last_block;
      struct ext2_super_block *sb = fs->super;
      struct ext2_group_desc *gd;
      blk_t blocks_per_group = fs->super->s_blocks_per_group;
      blk_t bpg_max;
      int   inodes_per_block;
      int   ipg_max;
      int   inode_size;
      int   buggy_init_scripts;
      dgrp_t      i;
      blk_t should_be;
      struct problem_context  pctx;
      __u32 free_blocks = 0, free_inodes = 0;

      inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
      ipg_max = inodes_per_block * (blocks_per_group - 4);
      if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
            ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
      bpg_max = 8 * EXT2_BLOCK_SIZE(sb);
      if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
            bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);

      ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
             sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
      ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
             sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
      ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
            sizeof(int) * fs->group_desc_count, "invalid_inode_table");

      clear_problem_context(&pctx);

      /*
       * Verify the super block constants...
       */
      check_super_value(ctx, "inodes_count", sb->s_inodes_count,
                    MIN_CHECK, 1, 0);
      check_super_value(ctx, "blocks_count", sb->s_blocks_count,
                    MIN_CHECK, 1, 0);
      check_super_value(ctx, "first_data_block", sb->s_first_data_block,
                    MAX_CHECK, 0, sb->s_blocks_count);
      check_super_value(ctx, "log_block_size", sb->s_log_block_size,
                    MIN_CHECK | MAX_CHECK, 0,
                    EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
      check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
                    MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size);
      check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
                    MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group,
                    bpg_max);
      check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
                    MIN_CHECK | MAX_CHECK, 8, bpg_max);
      check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
                    MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
      check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count,
                    MAX_CHECK, 0, sb->s_blocks_count / 2);
      check_super_value(ctx, "reserved_gdt_blocks", 
                    sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
                    fs->blocksize/4);
      inode_size = EXT2_INODE_SIZE(sb);
      check_super_value(ctx, "inode_size",
                    inode_size, MIN_CHECK | MAX_CHECK,
                    EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize);
      if (inode_size & (inode_size - 1)) {
            pctx.num = inode_size;
            pctx.str = "inode_size";
            fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
            ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
            return;
      }
            
      if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
          (ctx->num_blocks < sb->s_blocks_count)) {
            pctx.blk = sb->s_blocks_count;
            pctx.blk2 = ctx->num_blocks;
            if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
                  ctx->flags |= E2F_FLAG_ABORT;
                  return;
            }
      }

      if (sb->s_log_block_size != (__u32) sb->s_log_frag_size) {
            pctx.blk = EXT2_BLOCK_SIZE(sb);
            pctx.blk2 = EXT2_FRAG_SIZE(sb);
            fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }

      should_be = sb->s_frags_per_group >>
            (sb->s_log_block_size - sb->s_log_frag_size);         
      if (sb->s_blocks_per_group != should_be) {
            pctx.blk = sb->s_blocks_per_group;
            pctx.blk2 = should_be;
            fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }

      should_be = (sb->s_log_block_size == 0) ? 1 : 0;
      if (sb->s_first_data_block != should_be) {
            pctx.blk = sb->s_first_data_block;
            pctx.blk2 = should_be;
            fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
            ctx->flags |= E2F_FLAG_ABORT;
            return;
      }

      should_be = sb->s_inodes_per_group * fs->group_desc_count;
      if (sb->s_inodes_count != should_be) {
            pctx.ino = sb->s_inodes_count;
            pctx.ino2 = should_be;
            if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
                  sb->s_inodes_count = should_be;
                  ext2fs_mark_super_dirty(fs);
            }
      }

      /*
       * Verify the group descriptors....
       */
      first_block =  sb->s_first_data_block;

      for (i = 0, gd=fs->group_desc; i < fs->group_desc_count; i++, gd++) {
            pctx.group = i;

            first_block = ext2fs_group_first_block(fs, i);
            last_block = ext2fs_group_last_block(fs, i);

            if ((gd->bg_block_bitmap < first_block) ||
                (gd->bg_block_bitmap > last_block)) {
                  pctx.blk = gd->bg_block_bitmap;
                  if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
                        gd->bg_block_bitmap = 0;
            }
            if (gd->bg_block_bitmap == 0) {
                  ctx->invalid_block_bitmap_flag[i]++;
                  ctx->invalid_bitmaps++;
            }
            if ((gd->bg_inode_bitmap < first_block) ||
                (gd->bg_inode_bitmap > last_block)) {
                  pctx.blk = gd->bg_inode_bitmap;
                  if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
                        gd->bg_inode_bitmap = 0;
            }
            if (gd->bg_inode_bitmap == 0) {
                  ctx->invalid_inode_bitmap_flag[i]++;
                  ctx->invalid_bitmaps++;
            }
            if ((gd->bg_inode_table < first_block) ||
                ((gd->bg_inode_table +
                  fs->inode_blocks_per_group - 1) > last_block)) {
                  pctx.blk = gd->bg_inode_table;
                  if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
                        gd->bg_inode_table = 0;
            }
            if (gd->bg_inode_table == 0) {
                  ctx->invalid_inode_table_flag[i]++;
                  ctx->invalid_bitmaps++;
            }
            free_blocks += gd->bg_free_blocks_count;
            free_inodes += gd->bg_free_inodes_count;

            if ((gd->bg_free_blocks_count > sb->s_blocks_per_group) ||
                (gd->bg_free_inodes_count > sb->s_inodes_per_group) ||
                (gd->bg_used_dirs_count > sb->s_inodes_per_group))
                  ext2fs_unmark_valid(fs);

      }

      /*
       * Update the global counts from the block group counts.  This
       * is needed for an experimental patch which eliminates
       * locking the entire filesystem when allocating blocks or
       * inodes; if the filesystem is not unmounted cleanly, the
       * global counts may not be accurate.
       */
      if ((free_blocks != sb->s_free_blocks_count) ||
          (free_inodes != sb->s_free_inodes_count)) {
            if (ctx->options & E2F_OPT_READONLY)
                  ext2fs_unmark_valid(fs);
            else {
                  sb->s_free_blocks_count = free_blocks;
                  sb->s_free_inodes_count = free_inodes;
                  ext2fs_mark_super_dirty(fs);
            }
      }
      
      if ((sb->s_free_blocks_count > sb->s_blocks_count) ||
          (sb->s_free_inodes_count > sb->s_inodes_count))
            ext2fs_unmark_valid(fs);


      /*
       * If we have invalid bitmaps, set the error state of the
       * filesystem.
       */
      if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
            sb->s_state &= ~EXT2_VALID_FS;
            ext2fs_mark_super_dirty(fs);
      }

      clear_problem_context(&pctx);
      
#ifndef EXT2_SKIP_UUID
      /*
       * If the UUID field isn't assigned, assign it.
       */
      if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
            if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
                  uuid_generate(sb->s_uuid);
                  ext2fs_mark_super_dirty(fs);
                  fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
            }
      }
#endif

      /*
       * For the Hurd, check to see if the filetype option is set,
       * since it doesn't support it.
       */
      if (!(ctx->options & E2F_OPT_READONLY) &&
          fs->super->s_creator_os == EXT2_OS_HURD &&
          (fs->super->s_feature_incompat &
           EXT2_FEATURE_INCOMPAT_FILETYPE)) {
            if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
                  fs->super->s_feature_incompat &=
                        ~EXT2_FEATURE_INCOMPAT_FILETYPE;
                  ext2fs_mark_super_dirty(fs);
                  fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
            }
      }

      /*
       * If we have any of the compatibility flags set, we need to have a
       * revision 1 filesystem.  Most kernels will not check the flags on
       * a rev 0 filesystem and we may have corruption issues because of
       * the incompatible changes to the filesystem.
       */
      if (!(ctx->options & E2F_OPT_READONLY) &&
          fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
          (fs->super->s_feature_compat ||
           fs->super->s_feature_ro_compat ||
           fs->super->s_feature_incompat) &&
          fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
            ext2fs_update_dynamic_rev(fs);
            ext2fs_mark_super_dirty(fs);
            fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
      }

      check_resize_inode(ctx);

      /*
       * Clean up any orphan inodes, if present.
       */
      if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
            fs->super->s_state &= ~EXT2_VALID_FS;
            ext2fs_mark_super_dirty(fs);
      }

      /*
       * Some buggy distributions (such as Ubuntu) have init scripts
       * and/or installers which fail to correctly set the system
       * clock before running e2fsck and/or formatting the
       * filesystem initially.  Normally this happens because the
       * hardware clock is ticking localtime, instead of the more
       * proper and less error-prone UTC time.  So while the kernel
       * is booting, the system time (which in Linux systems always
       * ticks in UTC time) is set from the hardware clock, but
       * since the hardware clock is ticking localtime, the system
       * time is incorrect.  Unfortunately, some buggy distributions
       * do not correct this before running e2fsck.  If this option
       * is set to a boolean value of true, we attempt to work
       * around this situation by allowing the superblock last write
       * time, last mount time, and last check time to be in the
       * future by up to 24 hours.
       */
      profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
                      0, 0, &buggy_init_scripts);
      ctx->time_fudge = buggy_init_scripts ? 86400 : 0;

      /* 
       * Check to see if the superblock last mount time or last
       * write time is in the future.
       */
      if (fs->super->s_mtime > (__u32) ctx->now + ctx->time_fudge) {
            pctx.num = fs->super->s_mtime;
            if (fix_problem(ctx, PR_0_FUTURE_SB_LAST_MOUNT, &pctx)) {
                  fs->super->s_mtime = ctx->now;
                  ext2fs_mark_super_dirty(fs);
            }
      }
      if (fs->super->s_wtime > (__u32) ctx->now + ctx->time_fudge) {
            pctx.num = fs->super->s_wtime;
            if (fix_problem(ctx, PR_0_FUTURE_SB_LAST_WRITE, &pctx)) {
                  fs->super->s_wtime = ctx->now;
                  ext2fs_mark_super_dirty(fs);
            }
      }

      /*
       * Move the ext3 journal file, if necessary.
       */
      e2fsck_move_ext3_journal(ctx);

      /*
       * Fix journal hint, if necessary
       */
      e2fsck_fix_ext3_journal_hint(ctx);

      /*
       * Add dirhash hint if necessary
       */
      e2fsck_fix_dirhash_hint(ctx);

      return;
}

/*
 * Check to see if we should backup the master sb to the backup super
 * blocks.  Returns non-zero if the sb should be backed up.
 */

/*
 * A few flags are set on the fly by the kernel, but only in the
 * primary superblock.  This is actually a bad thing, and we should
 * try to discourage it in the future.  In particular, for the newer
 * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
 * EXT3_FEATURE_INCOMPAT_EXTENTS.  So some of these may go away in the
 * future.
 *
 * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
 * unfortunately, we shouldn't ignore it since if it's not set in the
 * backup, the extended attributes in the filesystem will be stripped
 * away.
 */
#define FEATURE_RO_COMPAT_IGNORE    (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
                               EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
#define FEATURE_INCOMPAT_IGNORE           (EXT3_FEATURE_INCOMPAT_EXTENTS)

int check_backup_super_block(e2fsck_t ctx)
{
      ext2_filsys fs = ctx->fs;
      ext2_filsys tfs = 0;
      io_manager  io_ptr;
      errcode_t   retval;
      dgrp_t            g;
      blk_t       sb;
      int         ret = 0;

      /*
       * If we are already writing out the backup blocks, then we
       * don't need to test.  Also, if the filesystem is invalid, or
       * the check was aborted or cancelled, we also don't want to
       * do the backup.  If the filesystem was opened read-only then
       * we can't do the backup.
       */
      if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
          !ext2fs_test_valid(fs) ||
          (fs->super->s_state & EXT2_ERROR_FS) ||
          (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
          (ctx->options & E2F_OPT_READONLY))
            return 0;

      for (g = 1; g < fs->group_desc_count; g++) {
            if (!ext2fs_bg_has_super(fs, g))
                  continue;

            sb = fs->super->s_first_data_block +
                  (g * fs->super->s_blocks_per_group);

            retval = ext2fs_open(ctx->filesystem_name, 0,
                             sb, fs->blocksize,
                             fs->io->manager, &tfs);
            if (retval) {
                  tfs = 0;
                  continue;
            }

#define SUPER_INCOMPAT_DIFFERENT(x) \
      (( fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=  \
       (tfs->super->x & ~FEATURE_INCOMPAT_IGNORE))
#define SUPER_RO_COMPAT_DIFFERENT(x)      \
      (( fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \
       (tfs->super->x & ~FEATURE_RO_COMPAT_IGNORE))
#define SUPER_DIFFERENT(x)          \
      (fs->super->x != tfs->super->x)

            if (SUPER_DIFFERENT(s_feature_compat) ||
                SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
                SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
                SUPER_DIFFERENT(s_blocks_count) ||
                SUPER_DIFFERENT(s_inodes_count) ||
                memcmp(fs->super->s_uuid, tfs->super->s_uuid,
                     sizeof(fs->super->s_uuid)))
                  ret = 1;
            ext2fs_close(tfs);
            break;
      }
      return ret;
}

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