C++ EXT2_HAS_RO_COMPAT_FEATURE函数代码示例

static void parse_int_node(ext2_filsys fs,
			   struct ext2_db_entry2 *db,
			   struct check_dir_struct *cd,
			   struct dx_dir_info	*dx_dir,
			   char *block_buf, int failed_csum)
{
	struct 		ext2_dx_root_info  *root;
	struct 		ext2_dx_entry *ent;
	struct		ext2_dx_countlimit *limit;
	struct dx_dirblock_info	*dx_db;
	int		i, expect_limit, count;
	blk_t		blk;
	ext2_dirhash_t	min_hash = 0xffffffff;
	ext2_dirhash_t	max_hash = 0;
	ext2_dirhash_t	hash = 0, prev_hash;
	int		csum_size = 0;

	if (db->blockcnt == 0) {
		root = (struct ext2_dx_root_info *) (block_buf + 24);

#ifdef DX_DEBUG
		printf("Root node dump:\n");
		printf("\t Reserved zero: %u\n", root->reserved_zero);
		printf("\t Hash Version: %d\n", root->hash_version);
		printf("\t Info length: %d\n", root->info_length);
		printf("\t Indirect levels: %d\n", root->indirect_levels);
		printf("\t Flags: %d\n", root->unused_flags);
#endif

		ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);

		if (failed_csum &&
		    (e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
		     fix_problem(cd->ctx, PR_2_HTREE_ROOT_CSUM_INVALID,
				&cd->pctx)))
			goto clear_and_exit;
	} else {
		ent = (struct ext2_dx_entry *) (block_buf+8);

		if (failed_csum &&
		    (e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
		     fix_problem(cd->ctx, PR_2_HTREE_NODE_CSUM_INVALID,
				&cd->pctx)))
			goto clear_and_exit;
	}

	limit = (struct ext2_dx_countlimit *) ent;

#ifdef DX_DEBUG
	printf("Number of entries (count): %d\n",
	       ext2fs_le16_to_cpu(limit->count));
	printf("Number of entries (limit): %d\n",
	       ext2fs_le16_to_cpu(limit->limit));
#endif

	count = ext2fs_le16_to_cpu(limit->count);
	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dx_tail);
	expect_limit = (fs->blocksize -
			(csum_size + ((char *) ent - block_buf))) /
		       sizeof(struct ext2_dx_entry);
	if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
		cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
		if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
			goto clear_and_exit;
	}
	if (count > expect_limit) {
		cd->pctx.num = count;
		if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
			goto clear_and_exit;
		count = expect_limit;
	}

	for (i=0; i < count; i++) {
		prev_hash = hash;
		hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
#ifdef DX_DEBUG
		printf("Entry #%d: Hash 0x%08x, block %u\n", i,
		       hash, ext2fs_le32_to_cpu(ent[i].block));
#endif
		blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
		/* Check to make sure the block is valid */
		if (blk >= (blk_t) dx_dir->numblocks) {
			cd->pctx.blk = blk;
			if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
					&cd->pctx))
				goto clear_and_exit;
			continue;
		}
		if (hash < prev_hash &&
		    fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
			goto clear_and_exit;
		dx_db = &dx_dir->dx_block[blk];
		if (dx_db->flags & DX_FLAG_REFERENCED) {
			dx_db->flags |= DX_FLAG_DUP_REF;
		} else {
			dx_db->flags |= DX_FLAG_REFERENCED;
			dx_db->parent = db->blockcnt;
		}
//.........这里部分代码省略.........

static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t 		i;
	unsigned int	j;
	int		block_nbytes, inode_nbytes;
	unsigned int	nbits;
	errcode_t	retval;
	char		*block_buf = NULL, *inode_buf = NULL;
	int		csum_flag = 0;
	blk64_t		blk;
	blk64_t		blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
	ext2_ino_t	ino_itr = 1;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!(fs->flags & EXT2_FLAG_RW))
		return EXT2_ET_RO_FILSYS;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		csum_flag = 1;

	inode_nbytes = block_nbytes = 0;
	if (do_block) {
		block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
		retval = io_channel_alloc_buf(fs->io, 0, &block_buf);
		if (retval)
			goto errout;
		memset(block_buf, 0xff, fs->blocksize);
	}
	if (do_inode) {
		inode_nbytes = (size_t)
			((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
		retval = io_channel_alloc_buf(fs->io, 0, &inode_buf);
		if (retval)
			goto errout;
		memset(inode_buf, 0xff, fs->blocksize);
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (!do_block)
			goto skip_block_bitmap;

		if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)
		    )
			goto skip_this_block_bitmap;

		retval = ext2fs_get_block_bitmap_range2(fs->block_map,
				blk_itr, block_nbytes << 3, block_buf);
		if (retval)
			goto errout;

		if (i == fs->group_desc_count - 1) {
			/* Force bitmap padding for the last group */
			nbits = EXT2FS_NUM_B2C(fs,
				((ext2fs_blocks_count(fs->super)
				  - (__u64) fs->super->s_first_data_block)
				 % (__u64) EXT2_BLOCKS_PER_GROUP(fs->super)));
			if (nbits)
				for (j = nbits; j < fs->blocksize * 8; j++)
					ext2fs_set_bit(j, block_buf);
		}
		blk = ext2fs_block_bitmap_loc(fs, i);
		if (blk) {
			retval = io_channel_write_blk64(fs->io, blk, 1,
							block_buf);
			if (retval) {
				retval = EXT2_ET_BLOCK_BITMAP_WRITE;
				goto errout;
			}
		}
	skip_this_block_bitmap:
		blk_itr += block_nbytes << 3;
	skip_block_bitmap:

		if (!do_inode)
			continue;

		if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)
		    )
			goto skip_this_inode_bitmap;

		retval = ext2fs_get_inode_bitmap_range2(fs->inode_map,
				ino_itr, inode_nbytes << 3, inode_buf);
		if (retval)
			goto errout;

		blk = ext2fs_inode_bitmap_loc(fs, i);
		if (blk) {
			retval = io_channel_write_blk64(fs->io, blk, 1,
						      inode_buf);
			if (retval) {
				retval = EXT2_ET_INODE_BITMAP_WRITE;
				goto errout;
			}
		}
	skip_this_inode_bitmap:
		ino_itr += inode_nbytes << 3;

	}
//.........这里部分代码省略.........

static void check_block_bitmaps(e2fsck_t ctx)
{
	ext2_filsys fs = ctx->fs;
	blk64_t	i;
	int	*free_array;
	int	group = 0;
	blk_t	blocks = 0;
	blk_t	free_blocks = 0;
	int	group_free = 0;
	int	actual, bitmap;
	struct problem_context	pctx;
	int	problem, save_problem, fixit, had_problem;
	errcode_t	retval;
	int		csum_flag;
	int		skip_group = 0;
	int	old_desc_blocks = 0;
	int	count = 0;
	int	cmp_block = 0;
	int	redo_flag = 0;
	blk64_t	super_blk, old_desc_blk, new_desc_blk;

	clear_problem_context(&pctx);
	free_array = (int *) e2fsck_allocate_memory(ctx,
	    fs->group_desc_count * sizeof(int), "free block count array");

	if ((fs->super->s_first_data_block <
	     ext2fs_get_block_bitmap_start2(ctx->block_found_map)) ||
	    (fs->super->s_blocks_count-1 >
	     ext2fs_get_block_bitmap_end2(ctx->block_found_map))) {
		pctx.num = 1;
		pctx.blk = fs->super->s_first_data_block;
		pctx.blk2 = fs->super->s_blocks_count -1;
		pctx.ino = ext2fs_get_block_bitmap_start2(ctx->block_found_map);
		pctx.ino2 = ext2fs_get_block_bitmap_end2(ctx->block_found_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}

	if ((fs->super->s_first_data_block <
	     ext2fs_get_block_bitmap_start2(fs->block_map)) ||
	    (fs->super->s_blocks_count-1 >
	     ext2fs_get_block_bitmap_end2(fs->block_map))) {
		pctx.num = 2;
		pctx.blk = fs->super->s_first_data_block;
		pctx.blk2 = fs->super->s_blocks_count -1;
		pctx.ino = ext2fs_get_block_bitmap_start2(fs->block_map);
		pctx.ino2 = ext2fs_get_block_bitmap_end2(fs->block_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}

	csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
					       EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
redo_counts:
	had_problem = 0;
	save_problem = 0;
	pctx.blk = pctx.blk2 = NO_BLK;
	if (csum_flag &&
	    (fs->group_desc[group].bg_flags & EXT2_BG_BLOCK_UNINIT))
		skip_group++;
	for (i = fs->super->s_first_data_block;
	     i < fs->super->s_blocks_count;
	     i++) {
		actual = ext2fs_fast_test_block_bitmap2(ctx->block_found_map, i);

		if (skip_group) {
			if ((i - fs->super->s_first_data_block) %
			    fs->super->s_blocks_per_group == 0) {
				super_blk = 0;
				old_desc_blk = 0;
				new_desc_blk = 0;
				ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
					 &old_desc_blk, &new_desc_blk, 0);

				if (fs->super->s_feature_incompat &
						EXT2_FEATURE_INCOMPAT_META_BG)
					old_desc_blocks =
						fs->super->s_first_meta_bg;
				else
					old_desc_blocks = fs->desc_blocks +
					fs->super->s_reserved_gdt_blocks;

				count = 0;
				cmp_block = fs->super->s_blocks_per_group;
				if (group == (int)fs->group_desc_count - 1)
					cmp_block =
						fs->super->s_blocks_count %
						fs->super->s_blocks_per_group;
			}

			bitmap = 0;
			if ((i == super_blk) ||
				(old_desc_blk && old_desc_blocks &&
				(i >= old_desc_blk) &&
				(i < old_desc_blk + old_desc_blocks)) ||
				(new_desc_blk && (i == new_desc_blk)) ||
//.........这里部分代码省略.........

static errcode_t copy_dir_entries(e2fsck_t ctx,
				  struct fill_dir_struct *fd,
				  struct out_dir *outdir)
{
	ext2_filsys 		fs = ctx->fs;
	errcode_t		retval;
	char			*block_start;
	struct hash_entry 	*ent;
	struct ext2_dir_entry	*dirent;
	unsigned int		rec_len, prev_rec_len, left, slack, offset;
	int			i;
	ext2_dirhash_t		prev_hash;
	int			csum_size = 0;
	struct			ext2_dir_entry_tail *t;

	if (ctx->htree_slack_percentage == 255) {
		profile_get_uint(ctx->profile, "options",
				 "indexed_dir_slack_percentage",
				 0, 20,
				 &ctx->htree_slack_percentage);
		if (ctx->htree_slack_percentage > 100)
			ctx->htree_slack_percentage = 20;
	}

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);

	outdir->max = 0;
	retval = alloc_size_dir(fs, outdir,
				(fd->dir_size / fs->blocksize) + 2);
	if (retval)
		return retval;
	outdir->num = fd->compress ? 0 : 1;
	offset = 0;
	outdir->hashes[0] = 0;
	prev_hash = 1;
	if ((retval = get_next_block(fs, outdir, &block_start)))
		return retval;
	dirent = (struct ext2_dir_entry *) block_start;
	prev_rec_len = 0;
	rec_len = 0;
	left = fs->blocksize - csum_size;
	slack = fd->compress ? 12 :
		((fs->blocksize - csum_size) * ctx->htree_slack_percentage)/100;
	if (slack < 12)
		slack = 12;
	for (i = 0; i < fd->num_array; i++) {
		ent = fd->harray + i;
		if (ent->dir->inode == 0)
			continue;
		rec_len = EXT2_DIR_REC_LEN(ext2fs_dirent_name_len(ent->dir));
		if (rec_len > left) {
			if (left) {
				left += prev_rec_len;
				retval = ext2fs_set_rec_len(fs, left, dirent);
				if (retval)
					return retval;
			}
			if (csum_size) {
				t = EXT2_DIRENT_TAIL(block_start,
						     fs->blocksize);
				ext2fs_initialize_dirent_tail(fs, t);
			}
			if ((retval = get_next_block(fs, outdir,
						      &block_start)))
				return retval;
			offset = 0;
		}
		left = (fs->blocksize - csum_size) - offset;
		dirent = (struct ext2_dir_entry *) (block_start + offset);
		if (offset == 0) {
			if (ent->hash == prev_hash)
				outdir->hashes[outdir->num-1] = ent->hash | 1;
			else
				outdir->hashes[outdir->num-1] = ent->hash;
		}
		dirent->inode = ent->dir->inode;
		ext2fs_dirent_set_name_len(dirent,
					   ext2fs_dirent_name_len(ent->dir));
		ext2fs_dirent_set_file_type(dirent,
					    ext2fs_dirent_file_type(ent->dir));
		retval = ext2fs_set_rec_len(fs, rec_len, dirent);
		if (retval)
			return retval;
		prev_rec_len = rec_len;
		memcpy(dirent->name, ent->dir->name,
		       ext2fs_dirent_name_len(dirent));
		offset += rec_len;
		left -= rec_len;
		if (left < slack) {
			prev_rec_len += left;
			retval = ext2fs_set_rec_len(fs, prev_rec_len, dirent);
			if (retval)
				return retval;
			offset += left;
			left = 0;
		}
		prev_hash = ent->hash;
	}
//.........这里部分代码省略.........

//.........这里部分代码省略.........
#ifdef CONFIG_EXT2_FS_XATTR
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
	
	set_opt(sbi->s_mount_opt, RESERVATION);

	if (!parse_options ((char *) data, sbi))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);

	ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
				    EXT2_MOUNT_XIP if not */

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		printk("EXT2-fs warning: feature flags set on rev 0 fs, "
		       "running e2fsck is recommended\n");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		printk("EXT2-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		printk("EXT2-fs: %s: couldn't mount RDWR because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
		if (!silent)
			printk("XIP: Unsupported blocksize\n");
		goto failed_mount;
	}

	/* If the blocksize doesn't match, re-read the thing.. */

/*
 * This computes the fields of the m_ext2fs structure from the
 * data in the ext2fs structure read in.
 */
static int
compute_sb_data(struct vnode *devvp, struct ext2fs *es,
    struct m_ext2fs *fs)
{
	int db_count, error;
	int i;
	int logic_sb_block = 1;	/* XXX for now */
	struct buf *bp;
	uint32_t e2fs_descpb;

	fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
	fs->e2fs_bsize = 1U << fs->e2fs_bshift;
	fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
	fs->e2fs_qbmask = fs->e2fs_bsize - 1;
	fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
	if (fs->e2fs_fsize)
		fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
	fs->e2fs_bpg = es->e2fs_bpg;
	fs->e2fs_fpg = es->e2fs_fpg;
	fs->e2fs_ipg = es->e2fs_ipg;
	if (es->e2fs_rev == E2FS_REV0) {
		fs->e2fs_isize = E2FS_REV0_INODE_SIZE;
	} else {
		fs->e2fs_isize = es->e2fs_inode_size;

		/*
		 * Simple sanity check for superblock inode size value.
		 */
		if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
		    EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
		    (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
			printf("ext2fs: invalid inode size %d\n",
			    fs->e2fs_isize);
			return (EIO);
		}
	}
	/* Check for extra isize in big inodes. */
	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
	    EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
		printf("ext2fs: no space for extra inode timestamps\n");
		return (EINVAL);
	}

	fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
	fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
	/* s_resuid / s_resgid ? */
	fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock,
	    EXT2_BLOCKS_PER_GROUP(fs));
	e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
	db_count = howmany(fs->e2fs_gcount, e2fs_descpb);
	fs->e2fs_gdbcount = db_count;
	fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
	    M_EXT2MNT, M_WAITOK);
	fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
	    sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);

	/*
	 * Adjust logic_sb_block.
	 * Godmar thinks: if the blocksize is greater than 1024, then
	 * the superblock is logically part of block zero.
	 */
	if (fs->e2fs_bsize > SBSIZE)
		logic_sb_block = 0;
	for (i = 0; i < db_count; i++) {
		error = bread(devvp,
		    fsbtodb(fs, logic_sb_block + i + 1),
		    fs->e2fs_bsize, NOCRED, &bp);
		if (error) {
			free(fs->e2fs_contigdirs, M_EXT2MNT);
			free(fs->e2fs_gd, M_EXT2MNT);
			brelse(bp);
			return (error);
		}
		e2fs_cgload((struct ext2_gd *)bp->b_data,
		    &fs->e2fs_gd[
		    i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
		    fs->e2fs_bsize);
		brelse(bp);
		bp = NULL;
	}
	/* Initialization for the ext2 Orlov allocator variant. */
	fs->e2fs_total_dir = 0;
	for (i = 0; i < fs->e2fs_gcount; i++)
		fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;

	if (es->e2fs_rev == E2FS_REV0 ||
	    !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
		fs->e2fs_maxfilesize = 0x7fffffff;
	else {
		fs->e2fs_maxfilesize = 0xffffffffffff;
		if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
			fs->e2fs_maxfilesize = 0x7fffffffffffffff;
	}
	if (es->e4fs_flags & E2FS_UNSIGNED_HASH) {
		fs->e2fs_uhash = 3;
	} else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) {
//.........这里部分代码省略.........

static errcode_t ext2fs_inline_data_convert_dir(ext2_filsys fs, ext2_ino_t ino,
        char *bbuf, char *ibuf, int size)
{
    struct ext2_dir_entry *dir, *dir2;
    struct ext2_dir_entry_tail *t;
    errcode_t retval;
    unsigned int offset, rec_len;
    int csum_size = 0;
    int filetype = 0;

    if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
                                   EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
        csum_size = sizeof(struct ext2_dir_entry_tail);

    /* Create '.' and '..' */
    if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
                                  EXT2_FEATURE_INCOMPAT_FILETYPE))
        filetype = EXT2_FT_DIR;

    /*
     * Set up entry for '.'
     */
    dir = (struct ext2_dir_entry *) bbuf;
    dir->inode = ino;
    ext2fs_dirent_set_name_len(dir, 1);
    ext2fs_dirent_set_file_type(dir, filetype);
    dir->name[0] = '.';
    rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
    dir->rec_len = EXT2_DIR_REC_LEN(1);

    /*
     * Set up entry for '..'
     */
    dir = (struct ext2_dir_entry *) (bbuf + dir->rec_len);
    dir->rec_len = EXT2_DIR_REC_LEN(2);
    dir->inode = ext2fs_le32_to_cpu(((__u32 *)ibuf)[0]);
    ext2fs_dirent_set_name_len(dir, 2);
    ext2fs_dirent_set_file_type(dir, filetype);
    dir->name[0] = '.';
    dir->name[1] = '.';

    /*
     * Ajust the last rec_len
     */
    offset = EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2);
    dir = (struct ext2_dir_entry *) (bbuf + offset);
    memcpy(bbuf + offset, ibuf + EXT4_INLINE_DATA_DOTDOT_SIZE,
           size - EXT4_INLINE_DATA_DOTDOT_SIZE);
    size += EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) -
            EXT4_INLINE_DATA_DOTDOT_SIZE;

    do {
        dir2 = dir;
        retval = ext2fs_get_rec_len(fs, dir, &rec_len);
        if (retval)
            goto err;
        offset += rec_len;
        dir = (struct ext2_dir_entry *) (bbuf + offset);
    } while (offset < size);
    rec_len += fs->blocksize - csum_size - offset;
    retval = ext2fs_set_rec_len(fs, rec_len, dir2);
    if (retval)
        goto err;

    if (csum_size) {
        t = EXT2_DIRENT_TAIL(bbuf, fs->blocksize);
        ext2fs_initialize_dirent_tail(fs, t);
    }

err:
    return retval;
}

static void check_block_bitmaps(e2fsck_t ctx)
{
	ext2_filsys fs = ctx->fs;
	blk64_t	i;
	unsigned int	*free_array;
	int	group = 0;
	unsigned int	blocks = 0;
	blk64_t	free_blocks = 0;
	blk64_t first_free = ext2fs_blocks_count(fs->super);
	unsigned int	group_free = 0;
	int	actual, bitmap;
	struct problem_context	pctx;
	int	problem, save_problem, fixit, had_problem;
	errcode_t	retval;
	int		csum_flag;
	int		skip_group = 0;
	int	old_desc_blocks = 0;
	int	count = 0;
	int	cmp_block = 0;
	int	redo_flag = 0;
	blk64_t	super_blk, old_desc_blk, new_desc_blk;

	clear_problem_context(&pctx);
	free_array = (unsigned int *) e2fsck_allocate_memory(ctx,
	    fs->group_desc_count * sizeof(unsigned int), "free block count array");

	if ((B2C(fs->super->s_first_data_block) <
	     ext2fs_get_block_bitmap_start2(ctx->block_found_map)) ||
	    (B2C(ext2fs_blocks_count(fs->super)-1) >
	     ext2fs_get_block_bitmap_end2(ctx->block_found_map))) {
		pctx.num = 1;
		pctx.blk = B2C(fs->super->s_first_data_block);
		pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1);
		pctx.ino = ext2fs_get_block_bitmap_start2(ctx->block_found_map);
		pctx.ino2 = ext2fs_get_block_bitmap_end2(ctx->block_found_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}

	if ((B2C(fs->super->s_first_data_block) <
	     ext2fs_get_block_bitmap_start2(fs->block_map)) ||
	    (B2C(ext2fs_blocks_count(fs->super)-1) >
	     ext2fs_get_block_bitmap_end2(fs->block_map))) {
		pctx.num = 2;
		pctx.blk = B2C(fs->super->s_first_data_block);
		pctx.blk2 = B2C(ext2fs_blocks_count(fs->super) - 1);
		pctx.ino = ext2fs_get_block_bitmap_start2(fs->block_map);
		pctx.ino2 = ext2fs_get_block_bitmap_end2(fs->block_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}

	csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
					       EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
redo_counts:
	had_problem = 0;
	save_problem = 0;
	pctx.blk = pctx.blk2 = NO_BLK;
	if (csum_flag &&
	    (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
		skip_group++;
	for (i = B2C(fs->super->s_first_data_block);
	     i < ext2fs_blocks_count(fs->super);
	     i += EXT2FS_CLUSTER_RATIO(fs)) {
		actual = ext2fs_fast_test_block_bitmap2(ctx->block_found_map, i);

		if (skip_group) {
			if ((B2C(i) - B2C(fs->super->s_first_data_block)) %
			    fs->super->s_clusters_per_group == 0) {
				super_blk = 0;
				old_desc_blk = 0;
				new_desc_blk = 0;
				ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
					 &old_desc_blk, &new_desc_blk, 0);

				if (fs->super->s_feature_incompat &
						EXT2_FEATURE_INCOMPAT_META_BG)
					old_desc_blocks =
						fs->super->s_first_meta_bg;
				else
					old_desc_blocks = fs->desc_blocks +
					fs->super->s_reserved_gdt_blocks;

				count = 0;
				cmp_block = fs->super->s_clusters_per_group;
				if (group == (int)fs->group_desc_count - 1)
					cmp_block = EXT2FS_NUM_B2C(fs,
						    ext2fs_group_blocks_count(fs, group));
			}

			bitmap = 0;
			if (EQ_CLSTR(i, super_blk) ||
			    (old_desc_blk && old_desc_blocks &&
			     GE_CLSTR(i, old_desc_blk) &&
			     LE_CLSTR(i, old_desc_blk + old_desc_blocks-1)) ||
			    (new_desc_blk && EQ_CLSTR(i, new_desc_blk)) ||
//.........这里部分代码省略.........

static void check_inode_bitmaps(e2fsck_t ctx)
{
	ext2_filsys fs = ctx->fs;
	ext2_ino_t	i;
	unsigned int	free_inodes = 0;
	int		group_free = 0;
	int		dirs_count = 0;
	int		group = 0;
	unsigned int	inodes = 0;
	ext2_ino_t	*free_array;
	ext2_ino_t	*dir_array;
	int		actual, bitmap;
	errcode_t	retval;
	struct problem_context	pctx;
	int		problem, save_problem, fixit, had_problem;
	int		csum_flag;
	int		skip_group = 0;
	int		redo_flag = 0;
	ext2_ino_t		first_free = fs->super->s_inodes_per_group + 1;

	clear_problem_context(&pctx);
	free_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
	    fs->group_desc_count * sizeof(ext2_ino_t), "free inode count array");

	dir_array = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
	   fs->group_desc_count * sizeof(ext2_ino_t), "directory count array");

	if ((1 < ext2fs_get_inode_bitmap_start2(ctx->inode_used_map)) ||
	    (fs->super->s_inodes_count >
	     ext2fs_get_inode_bitmap_end2(ctx->inode_used_map))) {
		pctx.num = 3;
		pctx.blk = 1;
		pctx.blk2 = fs->super->s_inodes_count;
		pctx.ino = ext2fs_get_inode_bitmap_start2(ctx->inode_used_map);
		pctx.ino2 = ext2fs_get_inode_bitmap_end2(ctx->inode_used_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}
	if ((1 < ext2fs_get_inode_bitmap_start2(fs->inode_map)) ||
	    (fs->super->s_inodes_count >
	     ext2fs_get_inode_bitmap_end2(fs->inode_map))) {
		pctx.num = 4;
		pctx.blk = 1;
		pctx.blk2 = fs->super->s_inodes_count;
		pctx.ino = ext2fs_get_inode_bitmap_start2(fs->inode_map);
		pctx.ino2 = ext2fs_get_inode_bitmap_end2(fs->inode_map);
		fix_problem(ctx, PR_5_BMAP_ENDPOINTS, &pctx);

		ctx->flags |= E2F_FLAG_ABORT; /* fatal */
		goto errout;
	}

	csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
					       EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
redo_counts:
	had_problem = 0;
	save_problem = 0;
	pctx.ino = pctx.ino2 = 0;
	if (csum_flag &&
	    (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)))
		skip_group++;

	/* Protect loop from wrap-around if inodes_count is maxed */
	for (i = 1; i <= fs->super->s_inodes_count && i > 0; i++) {
		bitmap = 0;
		if (skip_group &&
		    i % fs->super->s_inodes_per_group == 1) {
			/*
			 * Current inode is the first inode
			 * in the current block group.
			 */
			if (ext2fs_test_inode_bitmap_range(
				    ctx->inode_used_map, i,
				    fs->super->s_inodes_per_group)) {
				/*
				 * When the compared inodes in inodes bitmap
				 * are 0, count the free inode,
				 * skip the current block group.
				 */
				first_free = 1;
				inodes = fs->super->s_inodes_per_group - 1;
				group_free = inodes;
				free_inodes += inodes;
				i += inodes;
				skip_group = 0;
				goto do_counts;
			}
		}

		actual = ext2fs_fast_test_inode_bitmap2(ctx->inode_used_map, i);
		if (redo_flag)
			bitmap = actual;
		else if (!skip_group)
			bitmap = ext2fs_fast_test_inode_bitmap2(fs->inode_map, i);
		if (!actual == !bitmap)
			goto do_counts;

		if (!actual && bitmap) {
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	if (def_mount_opts & EXT2_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT2_FS_XATTR
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
	sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
	
	set_opt(sbi->s_mount_opt, RESERVATION);

	if (!parse_options((char *) data, sb))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);
	sb->s_iflags |= SB_I_CGROUPWB;

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		ext2_msg(sb, KERN_WARNING,
			"warning: feature flags set on rev 0 fs, "
			"running e2fsck is recommended");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		ext2_msg(sb, KERN_ERR,	"error: couldn't mount because of "
		       "unsupported optional features (%x)",
			le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
		       "unsupported optional features (%x)",
		       le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
		struct blk_dax_ctl dax = {
			.sector = 0,
			.size = PAGE_SIZE,
		};
		if (blocksize != PAGE_SIZE) {

errcode_t ext2fs_initialize(const char *name, int flags,
			    struct ext2_super_block *param,
			    io_manager manager, ext2_filsys *ret_fs)
{
	ext2_filsys	fs;
	errcode_t	retval;
	struct ext2_super_block *super;
	unsigned int	rem;
	unsigned int	overhead = 0;
	unsigned int	ipg;
	dgrp_t		i;
	blk64_t		free_blocks;
	blk_t		numblocks;
	int		rsv_gdt;
	int		csum_flag;
	int		bigalloc_flag;
	int		io_flags;
	unsigned	reserved_inos;
	char		*buf = 0;
	char		c;
	double		reserved_ratio;

	if (!param || !ext2fs_blocks_count(param))
		return EXT2_ET_INVALID_ARGUMENT;

	retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
	if (retval)
		return retval;

	memset(fs, 0, sizeof(struct struct_ext2_filsys));
	fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
	fs->flags = flags | EXT2_FLAG_RW;
	fs->umask = 022;
	fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
#ifdef WORDS_BIGENDIAN
	fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
	io_flags = IO_FLAG_RW;
	if (flags & EXT2_FLAG_EXCLUSIVE)
		io_flags |= IO_FLAG_EXCLUSIVE;
	if (flags & EXT2_FLAG_DIRECT_IO)
		io_flags |= IO_FLAG_DIRECT_IO;
	retval = manager->open(name, io_flags, &fs->io);
	if (retval)
		goto cleanup;
	fs->image_io = fs->io;
	fs->io->app_data = fs;
	retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
	if (retval)
		goto cleanup;

	strcpy(fs->device_name, name);
	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
	if (retval)
		goto cleanup;
	fs->super = super;

	memset(super, 0, SUPERBLOCK_SIZE);

#define set_field(field, default) (super->field = param->field ? \
				   param->field : (default))
#define assign_field(field)	(super->field = param->field)

	super->s_magic = EXT2_SUPER_MAGIC;
	super->s_state = EXT2_VALID_FS;

	bigalloc_flag = EXT2_HAS_RO_COMPAT_FEATURE(param,
				   EXT4_FEATURE_RO_COMPAT_BIGALLOC);

	assign_field(s_log_block_size);

	if (bigalloc_flag) {
		set_field(s_log_cluster_size, super->s_log_block_size+4);
		if (super->s_log_block_size > super->s_log_cluster_size) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
	} else
		super->s_log_cluster_size = super->s_log_block_size;

	set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
	set_field(s_max_mnt_count, 0);
	set_field(s_errors, EXT2_ERRORS_DEFAULT);
	set_field(s_feature_compat, 0);
	set_field(s_feature_incompat, 0);
	set_field(s_feature_ro_compat, 0);
	set_field(s_default_mount_opts, 0);
	set_field(s_first_meta_bg, 0);
	set_field(s_raid_stride, 0);		/* default stride size: 0 */
	set_field(s_raid_stripe_width, 0);	/* default stripe width: 0 */
	set_field(s_log_groups_per_flex, 0);
	set_field(s_flags, 0);
	assign_field(s_backup_bgs[0]);
	assign_field(s_backup_bgs[1]);
	if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
		retval = EXT2_ET_UNSUPP_FEATURE;
		goto cleanup;
	}
	if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
		retval = EXT2_ET_RO_UNSUPP_FEATURE;
//.........这里部分代码省略.........

static void htree_dump_leaf_node(ext2_filsys fs, ext2_ino_t ino,
				 struct ext2_inode *inode,
				 struct ext2_dx_root_info * rootnode,
				 blk64_t blk, char *buf)
{
	errcode_t	errcode;
	struct ext2_dir_entry *dirent;
	int		thislen, col = 0;
	unsigned int	offset = 0;
	char		name[EXT2_NAME_LEN + 1];
	char		tmp[EXT2_NAME_LEN + 64];
	blk64_t		pblk;
	ext2_dirhash_t 	hash, minor_hash;
	unsigned int	rec_len;
	int		hash_alg;
	int		csum_size = 0;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);

	errcode = ext2fs_bmap2(fs, ino, inode, buf, 0, blk, 0, &pblk);
	if (errcode) {
		com_err("htree_dump_leaf_node", errcode,
			"while mapping logical block %llu\n", blk);
		return;
	}

	fprintf(pager, "Reading directory block %llu, phys %llu\n", blk, pblk);
	errcode = ext2fs_read_dir_block4(current_fs, pblk, buf, 0, ino);
	if (errcode) {
		com_err("htree_dump_leaf_node", errcode,
			"while reading block %llu (%llu)\n",
			blk, pblk);
		return;
	}
	hash_alg = rootnode->hash_version;
	if ((hash_alg <= EXT2_HASH_TEA) &&
	    (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
		hash_alg += 3;

	while (offset < fs->blocksize) {
		dirent = (struct ext2_dir_entry *) (buf + offset);
		errcode = ext2fs_get_rec_len(fs, dirent, &rec_len);
		if (errcode) {
			com_err("htree_dump_leaf_inode", errcode,
				"while getting rec_len for block %lu",
				(unsigned long) blk);
			return;
		}
		if (((offset + rec_len) > fs->blocksize) ||
		    (rec_len < 8) ||
		    ((rec_len % 4) != 0) ||
		    ((((unsigned) dirent->name_len & 0xFF)+8) > rec_len)) {
			fprintf(pager, "Corrupted directory block (%llu)!\n",
				blk);
			break;
		}
		thislen = dirent->name_len & 0xFF;
		strncpy(name, dirent->name, thislen);
		name[thislen] = '\0';
		errcode = ext2fs_dirhash(hash_alg, name,
					 thislen, fs->super->s_hash_seed,
					 &hash, &minor_hash);
		if (errcode)
			com_err("htree_dump_leaf_node", errcode,
				"while calculating hash");
		if ((offset == fs->blocksize - csum_size) &&
		    (dirent->inode == 0) &&
		    (dirent->rec_len == csum_size) &&
		    (dirent->name_len == EXT2_DIR_NAME_LEN_CSUM)) {
			struct ext2_dir_entry_tail *t;

			t = (struct ext2_dir_entry_tail *) dirent;

			snprintf(tmp, EXT2_NAME_LEN + 64,
				 "leaf block checksum: 0x%08x  ",
				 t->det_checksum);
		} else {
			snprintf(tmp, EXT2_NAME_LEN + 64,
				 "%u 0x%08x-%08x (%d) %s   ",
				 dirent->inode, hash, minor_hash,
				 rec_len, name);
		}
		thislen = strlen(tmp);
		if (col + thislen > 80) {
			fprintf(pager, "\n");
			col = 0;
		}
		fprintf(pager, "%s", tmp);
		col += thislen;
		offset += rec_len;
	}
	fprintf(pager, "\n");
}

static int check_dir_block(ext2_filsys fs,
			   struct ext2_db_entry2 *db,
			   void *priv_data)
{
 	struct dx_dir_info	*dx_dir;
#ifdef ENABLE_HTREE
	struct dx_dirblock_info	*dx_db = 0;
#endif /* ENABLE_HTREE */
	struct ext2_dir_entry 	*dirent, *prev;
	ext2_dirhash_t		hash;
	unsigned int		offset = 0;
	int			dir_modified = 0;
	int			dot_state;
	unsigned int		rec_len;
	blk64_t			block_nr = db->blk;
	ext2_ino_t 		ino = db->ino;
	ext2_ino_t 		subdir_parent;
	__u16			links;
	struct check_dir_struct	*cd;
	char 			*buf;
	e2fsck_t		ctx;
	int			problem;
	struct ext2_dx_root_info *root;
	struct ext2_dx_countlimit *limit;
	static dict_t de_dict;
	struct problem_context	pctx;
	int	dups_found = 0;
	int	ret;
	int	dx_csum_size = 0, de_csum_size = 0;
	int	failed_csum = 0;
	int	is_leaf = 1;

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

	if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
		return DIRENT_ABORT;

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

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		dx_csum_size = sizeof(struct ext2_dx_tail);
		de_csum_size = sizeof(struct ext2_dir_entry_tail);
	}

	/*
	 * Make sure the inode is still in use (could have been
	 * deleted in the duplicate/bad blocks pass.
	 */
	if (!(ext2fs_test_inode_bitmap2(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 (ctx->dirs_to_hash &&
	    ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
		dups_found++;

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

	ehandler_operation(_("reading directory block"));
	cd->pctx.errcode = ext2fs_read_dir_block4(fs, block_nr, buf, 0, ino);
	ehandler_operation(0);
	if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
		cd->pctx.errcode = 0; /* We'll handle this ourselves */
	else if (cd->pctx.errcode == EXT2_ET_DIR_CSUM_INVALID) {
		cd->pctx.errcode = 0; /* We'll handle this ourselves */
		failed_csum = 1;
	}
	if (cd->pctx.errcode) {
		char *buf2;
		if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
			ctx->flags |= E2F_FLAG_ABORT;
			return DIRENT_ABORT;
		}
		ext2fs_new_dir_block(fs, db->blockcnt == 0 ? ino : 0,
				     EXT2_ROOT_INO, &buf2);
		memcpy(buf, buf2, fs->blocksize);
//.........这里部分代码省略.........

/*
 * Create new directory block
 */
errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
			       ext2_ino_t parent_ino, char **block)
{
	struct ext2_dir_entry 	*dir = NULL;
	errcode_t		retval;
	char			*buf;
	int			rec_len;
	int			filetype = 0;
	struct ext2_dir_entry_tail	*t;
	int			csum_size = 0;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	retval = ext2fs_get_mem(fs->blocksize, &buf);
	if (retval)
		return retval;
	memset(buf, 0, fs->blocksize);
	dir = (struct ext2_dir_entry *) buf;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);

	retval = ext2fs_set_rec_len(fs, fs->blocksize - csum_size, dir);
	if (retval)
		return retval;

	if (dir_ino) {
		if (fs->super->s_feature_incompat &
		    EXT2_FEATURE_INCOMPAT_FILETYPE)
			filetype = EXT2_FT_DIR;
		/*
		 * Set up entry for '.'
		 */
		dir->inode = dir_ino;
		ext2fs_dirent_set_name_len(dir, 1);
		ext2fs_dirent_set_file_type(dir, filetype);
		dir->name[0] = '.';
		rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
		dir->rec_len = EXT2_DIR_REC_LEN(1);

		/*
		 * Set up entry for '..'
		 */
		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
		retval = ext2fs_set_rec_len(fs, rec_len, dir);
		if (retval)
			return retval;
		dir->inode = parent_ino;
		ext2fs_dirent_set_name_len(dir, 2);
		ext2fs_dirent_set_file_type(dir, filetype);
		dir->name[0] = '.';
		dir->name[1] = '.';

	}

	if (csum_size) {
		t = EXT2_DIRENT_TAIL(buf, fs->blocksize);
		ext2fs_initialize_dirent_tail(fs, t);
	}
	*block = buf;
	return 0;
}

static int ext2_remount (struct super_block * sb, int * flags, char * data)
{
	struct ext2_sb_info * sbi = EXT2_SB(sb);
	struct ext2_super_block * es;
	struct ext2_mount_options old_opts;
	unsigned long old_sb_flags;
	int err;

	sync_filesystem(sb);
	spin_lock(&sbi->s_lock);

	/* Store the old options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
	if (!parse_options(data, sb)) {
		err = -EINVAL;
		goto restore_opts;
	}

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

	es = sbi->s_es;
	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
		ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
			 "dax flag with busy inodes while remounting");
		sbi->s_mount_opt ^= EXT2_MOUNT_DAX;
	}
	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
		spin_unlock(&sbi->s_lock);
		return 0;
	}
	if (*flags & MS_RDONLY) {
		if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
		    !(sbi->s_mount_state & EXT2_VALID_FS)) {
			spin_unlock(&sbi->s_lock);
			return 0;
		}

		/*
		 * OK, we are remounting a valid rw partition rdonly, so set
		 * the rdonly flag and then mark the partition as valid again.
		 */
		es->s_state = cpu_to_le16(sbi->s_mount_state);
		es->s_mtime = cpu_to_le32(get_seconds());
		spin_unlock(&sbi->s_lock);

		err = dquot_suspend(sb, -1);
		if (err < 0) {
			spin_lock(&sbi->s_lock);
			goto restore_opts;
		}

		ext2_sync_super(sb, es, 1);
	} else {
		__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
					       ~EXT2_FEATURE_RO_COMPAT_SUPP);
		if (ret) {
			ext2_msg(sb, KERN_WARNING,
				"warning: couldn't remount RDWR because of "
				"unsupported optional features (%x).",
				le32_to_cpu(ret));
			err = -EROFS;
			goto restore_opts;
		}
		/*
		 * Mounting a RDONLY partition read-write, so reread and
		 * store the current valid flag.  (It may have been changed
		 * by e2fsck since we originally mounted the partition.)
		 */
		sbi->s_mount_state = le16_to_cpu(es->s_state);
		if (!ext2_setup_super (sb, es, 0))
			sb->s_flags &= ~MS_RDONLY;
		spin_unlock(&sbi->s_lock);

		ext2_write_super(sb);

		dquot_resume(sb, -1);
	}

	return 0;
restore_opts:
	sbi->s_mount_opt = old_opts.s_mount_opt;
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sb->s_flags = old_sb_flags;
	spin_unlock(&sbi->s_lock);
	return err;
}