Adding upstream version 1.47.0.upstream/1.47.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 491 insertions, 0 deletions

diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
new file mode 100644
index 0000000..fe764b9
--- /dev/null
+++ b/lib/ext2fs/swapfs.c
@@ -0,0 +1,491 @@
+/*
+ * swapfs.c --- swap ext2 filesystem data structures
+ *
+ * Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <string.h>
+#include <time.h>
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+#include "ext2fsP.h"
+#include <ext2fs/ext2_ext_attr.h>
+
+void ext2fs_swap_super(struct ext2_super_block * sb)
+{
+	int i;
+
+	sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
+	sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
+	sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
+	sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
+	sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
+	sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
+	sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
+	sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size);
+	sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
+	sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group);
+	sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
+	sb->s_mtime = ext2fs_swab32(sb->s_mtime);
+	sb->s_wtime = ext2fs_swab32(sb->s_wtime);
+	sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
+	sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
+	sb->s_magic = ext2fs_swab16(sb->s_magic);
+	sb->s_state = ext2fs_swab16(sb->s_state);
+	sb->s_errors = ext2fs_swab16(sb->s_errors);
+	sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
+	sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
+	sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
+	sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
+	sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
+	sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
+	sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
+	sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
+	sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
+	sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
+	sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
+	sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
+	sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
+	/* sb->s_uuid is __u8 and does not need swabbing */
+	/* sb->s_volume_name is char and does not need swabbing */
+	/* sb->s_last_mounted is char and does not need swabbing */
+	sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
+	/* sb->s_prealloc_blocks is __u8 and does not need swabbing */
+	/* sb->s_prealloc_dir_blocks is __u8 and does not need swabbing */
+	sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
+	/* sb->s_journal_uuid is __u8 and does not need swabbing */
+	sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
+	sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
+	sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
+	for (i = 0; i < 4; i++)
+		sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
+	/* sb->s_def_hash_version is __u8 and does not need swabbing */
+	/* sb->s_jnl_backup_type is __u8 and does not need swabbing */
+	sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
+	sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
+	sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
+	sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
+	/* if journal backup is for a valid extent-based journal... */
+	if (ext2fs_extent_header_verify(sb->s_jnl_blocks,
+					sizeof(sb->s_jnl_blocks)) == 0) {
+		/* ... swap only the journal i_size and i_size_high,
+		 * and the extent data is not swapped on read */
+		i = 15;
+	} else {
+		/* direct/indirect journal: swap it all */
+		i = 0;
+	}
+	for (; i < 17; i++)
+		sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
+	sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi);
+	sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi);
+	sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi);
+	sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize);
+	sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize);
+	sb->s_flags = ext2fs_swab32(sb->s_flags);
+	sb->s_raid_stride = ext2fs_swab16(sb->s_raid_stride);
+	sb->s_mmp_update_interval = ext2fs_swab16(sb->s_mmp_update_interval);
+	sb->s_mmp_block = ext2fs_swab64(sb->s_mmp_block);
+	sb->s_raid_stripe_width = ext2fs_swab32(sb->s_raid_stripe_width);
+	/* sb->s_log_groups_per_flex is __u8 and does not need swabbing */
+	/* sb->s_checksum_type is __u8 and does not need swabbing */
+	/* sb->s_encryption_level is __u8 and does not need swabbing */
+	/* sb->s_reserved_pad is __u8 and does not need swabbing */
+	sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written);
+	sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum);
+	sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id);
+	sb->s_snapshot_r_blocks_count =
+		ext2fs_swab64(sb->s_snapshot_r_blocks_count);
+	sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
+	sb->s_error_count = ext2fs_swab32(sb->s_error_count);
+	sb->s_first_error_time = ext2fs_swab32(sb->s_first_error_time);
+	sb->s_first_error_ino = ext2fs_swab32(sb->s_first_error_ino);
+	sb->s_first_error_block = ext2fs_swab64(sb->s_first_error_block);
+	/* sb->s_first_error_func is __u8 and does not need swabbing */
+	sb->s_last_error_time = ext2fs_swab32(sb->s_last_error_time);
+	sb->s_last_error_ino = ext2fs_swab32(sb->s_last_error_ino);
+	sb->s_last_error_block = ext2fs_swab64(sb->s_last_error_block);
+	/* sb->s_last_error_func is __u8 and does not need swabbing */
+	/* sb->s_mount_opts is __u8 and does not need swabbing */
+	sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
+	sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
+	sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters);
+	sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]);
+	sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]);
+	/* sb->s_encrypt_algos is __u8 and does not need swabbing */
+	/* sb->s_encrypt_pw_salt is __u8 and does not need swabbing */
+	sb->s_lpf_ino = ext2fs_swab32(sb->s_lpf_ino);
+	sb->s_prj_quota_inum = ext2fs_swab32(sb->s_prj_quota_inum);
+	sb->s_checksum_seed = ext2fs_swab32(sb->s_checksum_seed);
+	/* s_*_time_hi are __u8 and does not need swabbing */
+	sb->s_encoding = ext2fs_swab16(sb->s_encoding);
+	sb->s_encoding_flags = ext2fs_swab16(sb->s_encoding_flags);
+	sb->s_orphan_file_inum = ext2fs_swab32(sb->s_orphan_file_inum);
+	/* catch when new fields are used from s_reserved */
+	EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 94 * sizeof(__le32));
+	sb->s_checksum = ext2fs_swab32(sb->s_checksum);
+}
+
+void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
+{
+	struct ext4_group_desc *gdp4 = (struct ext4_group_desc *)gdp;
+
+	/* Do the 32-bit parts first */
+	gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
+	gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
+	gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
+	gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
+	gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
+	gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
+	gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
+	gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo);
+	gdp->bg_block_bitmap_csum_lo =
+		ext2fs_swab16(gdp->bg_block_bitmap_csum_lo);
+	gdp->bg_inode_bitmap_csum_lo =
+		ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo);
+	gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
+	gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
+	/* If we're 32-bit, we're done */
+	if (fs == NULL || EXT2_DESC_SIZE(fs->super) < EXT2_MIN_DESC_SIZE_64BIT)
+		return;
+
+	/* Swap the 64-bit parts */
+	gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi);
+	gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi);
+	gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi);
+	gdp4->bg_free_blocks_count_hi =
+		ext2fs_swab16(gdp4->bg_free_blocks_count_hi);
+	gdp4->bg_free_inodes_count_hi =
+		ext2fs_swab16(gdp4->bg_free_inodes_count_hi);
+	gdp4->bg_used_dirs_count_hi =
+		ext2fs_swab16(gdp4->bg_used_dirs_count_hi);
+	gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi);
+	gdp4->bg_exclude_bitmap_hi = ext2fs_swab16(gdp4->bg_exclude_bitmap_hi);
+	gdp4->bg_block_bitmap_csum_hi =
+		ext2fs_swab16(gdp4->bg_block_bitmap_csum_hi);
+	gdp4->bg_inode_bitmap_csum_hi =
+		ext2fs_swab16(gdp4->bg_inode_bitmap_csum_hi);
+	EXT2FS_BUILD_BUG_ON(sizeof(gdp4->bg_reserved) != sizeof(__u32));
+}
+
+void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
+{
+	ext2fs_swap_group_desc2(0, gdp);
+}
+
+
+void ext2fs_swap_ext_attr_header(struct ext2_ext_attr_header *to_header,
+				 struct ext2_ext_attr_header *from_header)
+{
+	int n;
+
+	to_header->h_magic    = ext2fs_swab32(from_header->h_magic);
+	to_header->h_blocks   = ext2fs_swab32(from_header->h_blocks);
+	to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
+	to_header->h_hash     = ext2fs_swab32(from_header->h_hash);
+	to_header->h_checksum = ext2fs_swab32(from_header->h_checksum);
+	for (n = 0; n < 3; n++)
+		to_header->h_reserved[n] =
+			ext2fs_swab32(from_header->h_reserved[n]);
+}
+
+void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry,
+				struct ext2_ext_attr_entry *from_entry)
+{
+	to_entry->e_value_offs  = ext2fs_swab16(from_entry->e_value_offs);
+	to_entry->e_value_inum  = ext2fs_swab32(from_entry->e_value_inum);
+	to_entry->e_value_size  = ext2fs_swab32(from_entry->e_value_size);
+	to_entry->e_hash	= ext2fs_swab32(from_entry->e_hash);
+}
+
+void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
+{
+	struct ext2_ext_attr_header *from_header =
+		(struct ext2_ext_attr_header *)from;
+	struct ext2_ext_attr_header *to_header =
+		(struct ext2_ext_attr_header *)to;
+	struct ext2_ext_attr_entry *from_entry, *to_entry;
+	char *from_end = (char *)from_header + bufsize;
+
+	if (to_header != from_header)
+		memcpy(to_header, from_header, bufsize);
+
+	if (has_header) {
+		ext2fs_swap_ext_attr_header(to_header, from_header);
+
+		from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
+		to_entry   = (struct ext2_ext_attr_entry *)(to_header+1);
+	} else {
+		from_entry = (struct ext2_ext_attr_entry *)from_header;
+		to_entry   = (struct ext2_ext_attr_entry *)to_header;
+	}
+
+	while ((char *)from_entry < from_end &&
+	       (char *)EXT2_EXT_ATTR_NEXT(from_entry) <= from_end &&
+	       *(__u32 *)from_entry) {
+		ext2fs_swap_ext_attr_entry(to_entry, from_entry);
+		from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
+		to_entry   = EXT2_EXT_ATTR_NEXT(to_entry);
+	}
+}
+
+void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
+			    struct ext2_inode_large *f, int hostorder,
+			    int bufsize)
+{
+	unsigned i, extra_isize, attr_magic;
+	int has_extents = 0, has_inline_data = 0, islnk = 0, fast_symlink = 0;
+	unsigned int inode_size;
+	__u32 *eaf, *eat;
+
+	/*
+	 * Note that t and f may point to the same address. That's why
+	 * if (hostorder) condition is executed before swab calls and
+	 * if (!hostorder) afterwards.
+	 */
+	if (hostorder) {
+		islnk = LINUX_S_ISLNK(f->i_mode);
+		fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(f));
+		has_extents = (f->i_flags & EXT4_EXTENTS_FL) != 0;
+		has_inline_data = (f->i_flags & EXT4_INLINE_DATA_FL) != 0;
+	}
+
+	t->i_mode = ext2fs_swab16(f->i_mode);
+	t->i_uid = ext2fs_swab16(f->i_uid);
+	t->i_size = ext2fs_swab32(f->i_size);
+	t->i_atime = ext2fs_swab32(f->i_atime);
+	t->i_ctime = ext2fs_swab32(f->i_ctime);
+	t->i_mtime = ext2fs_swab32(f->i_mtime);
+	t->i_dtime = ext2fs_swab32(f->i_dtime);
+	t->i_gid = ext2fs_swab16(f->i_gid);
+	t->i_links_count = ext2fs_swab16(f->i_links_count);
+	t->i_file_acl = ext2fs_swab32(f->i_file_acl);
+	t->i_blocks = ext2fs_swab32(f->i_blocks);
+	t->i_flags = ext2fs_swab32(f->i_flags);
+	t->i_size_high = ext2fs_swab32(f->i_size_high);
+
+	if (!hostorder) {
+		islnk = LINUX_S_ISLNK(t->i_mode);
+		fast_symlink = ext2fs_is_fast_symlink(EXT2_INODE(t));
+		has_extents = (t->i_flags & EXT4_EXTENTS_FL) != 0;
+		has_inline_data = (t->i_flags & EXT4_INLINE_DATA_FL) != 0;
+	}
+
+	/*
+	 * Extent data and inline data are swapped on access, not here
+	 */
+	if (!has_extents && !has_inline_data && (!islnk || !fast_symlink)) {
+		for (i = 0; i < EXT2_N_BLOCKS; i++)
+			t->i_block[i] = ext2fs_swab32(f->i_block[i]);
+	} else if (t != f) {
+		for (i = 0; i < EXT2_N_BLOCKS; i++)
+			t->i_block[i] = f->i_block[i];
+	}
+	t->i_generation = ext2fs_swab32(f->i_generation);
+	t->i_faddr = ext2fs_swab32(f->i_faddr);
+
+	switch (fs->super->s_creator_os) {
+	case EXT2_OS_LINUX:
+		t->osd1.linux1.l_i_version =
+			ext2fs_swab32(f->osd1.linux1.l_i_version);
+		t->osd2.linux2.l_i_blocks_hi =
+			ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi);
+		t->osd2.linux2.l_i_file_acl_high =
+			ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high);
+		t->osd2.linux2.l_i_uid_high =
+		  ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
+		t->osd2.linux2.l_i_gid_high =
+		  ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
+		t->osd2.linux2.l_i_checksum_lo =
+			ext2fs_swab16(f->osd2.linux2.l_i_checksum_lo);
+		break;
+	case EXT2_OS_HURD:
+		t->osd1.hurd1.h_i_translator =
+		  ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
+		t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
+		t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
+		t->osd2.hurd2.h_i_mode_high =
+		  ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
+		t->osd2.hurd2.h_i_uid_high =
+		  ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
+		t->osd2.hurd2.h_i_gid_high =
+		  ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
+		t->osd2.hurd2.h_i_author =
+		  ext2fs_swab32 (f->osd2.hurd2.h_i_author);
+		break;
+	default:
+		break;
+	}
+
+	if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
+		return; /* no i_extra_isize field */
+
+	if (hostorder)
+		extra_isize = f->i_extra_isize;
+	t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
+	if (!hostorder)
+		extra_isize = t->i_extra_isize;
+	if (extra_isize > EXT2_INODE_SIZE(fs->super) -
+				sizeof(struct ext2_inode)) {
+		/* this is error case: i_extra_size is too large */
+		return;
+	}
+	if (extra_isize & 3)
+		return;		/* Illegal inode extra_isize */
+
+	inode_size = EXT2_GOOD_OLD_INODE_SIZE + extra_isize;
+	if (inode_includes(inode_size, i_checksum_hi))
+		t->i_checksum_hi = ext2fs_swab16(f->i_checksum_hi);
+	if (inode_includes(inode_size, i_ctime_extra))
+		t->i_ctime_extra = ext2fs_swab32(f->i_ctime_extra);
+	if (inode_includes(inode_size, i_mtime_extra))
+		t->i_mtime_extra = ext2fs_swab32(f->i_mtime_extra);
+	if (inode_includes(inode_size, i_atime_extra))
+		t->i_atime_extra = ext2fs_swab32(f->i_atime_extra);
+	if (inode_includes(inode_size, i_crtime))
+		t->i_crtime = ext2fs_swab32(f->i_crtime);
+	if (inode_includes(inode_size, i_crtime_extra))
+		t->i_crtime_extra = ext2fs_swab32(f->i_crtime_extra);
+	if (inode_includes(inode_size, i_version_hi))
+		t->i_version_hi = ext2fs_swab32(f->i_version_hi);
+	if (inode_includes(inode_size, i_projid))
+                t->i_projid = ext2fs_swab32(f->i_projid);
+	/* catch new static fields added after i_projid */
+	EXT2FS_BUILD_BUG_ON(sizeof(struct ext2_inode_large) != 160);
+
+	i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32);
+	if (bufsize < (int) i)
+		return; /* no space for EA magic */
+
+	eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
+					extra_isize);
+
+	attr_magic = *eaf;
+	if (!hostorder)
+		attr_magic = ext2fs_swab32(attr_magic);
+
+	if (attr_magic != EXT2_EXT_ATTR_MAGIC)
+		return; /* it seems no magic here */
+
+	eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
+					extra_isize);
+	*eat = ext2fs_swab32(*eaf);
+
+	/* convert EA(s) */
+	ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
+			     bufsize - sizeof(struct ext2_inode) -
+			     extra_isize - sizeof(__u32), 0);
+
+}
+
+void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
+		       struct ext2_inode *f, int hostorder)
+{
+	ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
+				(struct ext2_inode_large *) f, hostorder,
+				sizeof(struct ext2_inode));
+}
+
+void ext2fs_swap_mmp(struct mmp_struct *mmp)
+{
+	mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic);
+	mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq);
+	mmp->mmp_time = ext2fs_swab64(mmp->mmp_time);
+	mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval);
+	mmp->mmp_checksum = ext2fs_swab32(mmp->mmp_checksum);
+}
+
+errcode_t ext2fs_dirent_swab_in(ext2_filsys fs, char *buf, int flags)
+{
+	return ext2fs_dirent_swab_in2(fs, buf, fs->blocksize, flags);
+}
+
+errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf,
+				 size_t size, int flags)
+{
+	errcode_t	retval;
+	char		*p, *end;
+	struct ext2_dir_entry *dirent;
+	unsigned int	name_len, rec_len, left;
+
+	p = (char *) buf;
+	end = (char *) buf + size;
+	left = size;
+	while (p < end-8) {
+		dirent = (struct ext2_dir_entry *) p;
+		dirent->inode = ext2fs_swab32(dirent->inode);
+		dirent->rec_len = ext2fs_swab16(dirent->rec_len);
+		dirent->name_len = ext2fs_swab16(dirent->name_len);
+		name_len = dirent->name_len;
+		if (flags & EXT2_DIRBLOCK_V2_STRUCT)
+			dirent->name_len = ext2fs_swab16(dirent->name_len);
+		retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
+		if (retval)
+			return retval;
+		if ((rec_len < 8) || (rec_len % 4)) {
+			rec_len = 8;
+			if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT))
+				return EXT2_ET_DIR_CORRUPTED;
+		} else if (((name_len & 0xFF) + 8) > rec_len)
+			if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT))
+				return EXT2_ET_DIR_CORRUPTED;
+		if (rec_len > left)
+			if (!(fs->flags & EXT2_FLAG_IGNORE_SWAP_DIRENT))
+				return EXT2_ET_DIR_CORRUPTED;
+		left -= rec_len;
+		p += rec_len;
+	}
+
+	return 0;
+}
+
+errcode_t ext2fs_dirent_swab_out(ext2_filsys fs, char *buf, int flags)
+{
+	return ext2fs_dirent_swab_out2(fs, buf, fs->blocksize, flags);
+}
+
+errcode_t ext2fs_dirent_swab_out2(ext2_filsys fs, char *buf,
+				  size_t size, int flags)
+{
+	errcode_t	retval;
+	char		*p, *end;
+	unsigned int	rec_len;
+	struct ext2_dir_entry *dirent;
+
+	p = buf;
+	end = buf + size;
+	while (p < end) {
+		dirent = (struct ext2_dir_entry *) p;
+		retval = ext2fs_get_rec_len(fs, dirent, &rec_len);
+		if (retval)
+			return retval;
+		if ((rec_len < 8) ||
+		    (rec_len % 4)) {
+			ext2fs_free_mem(&buf);
+			return EXT2_ET_DIR_CORRUPTED;
+		}
+		p += rec_len;
+		dirent->inode = ext2fs_swab32(dirent->inode);
+		dirent->rec_len = ext2fs_swab16(dirent->rec_len);
+		dirent->name_len = ext2fs_swab16(dirent->name_len);
+		if (rec_len > size)
+			return EXT2_ET_DIR_CORRUPTED;
+		size -= rec_len;
+
+		if (flags & EXT2_DIRBLOCK_V2_STRUCT)
+			dirent->name_len = ext2fs_swab16(dirent->name_len);
+	}
+
+	return 0;
+}