#include "ext4_blockdev.h"
#include "ext4_fs.h"
#include "ext4_super.h"
+#include "ext4_crc32c.h"
#include "ext4_hash.h"
#include <string.h>
&hinfo->hash, &hinfo->minor_hash);
}
+static uint32_t
+ext4_dir_dx_checksum(struct ext4_inode_ref *inode_ref,
+ void *dirent,
+ int count_offset, int count, struct ext4_directory_dx_tail *t)
+{
+ uint32_t orig_checksum, checksum = 0;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+ int size;
+
+ /* Compute the checksum only if the filesystem supports it */
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ size = count_offset +
+ (count * sizeof(struct ext4_directory_dx_tail));
+ orig_checksum = t->checksum;
+ t->checksum = 0;
+ /* First calculate crc32 checksum against fs uuid */
+ checksum = ext4_crc32c(~0, sb->uuid, sizeof(sb->uuid));
+ /* Then calculate crc32 checksum against all the dx_entry */
+ checksum = ext4_crc32c(checksum, dirent, size);
+ /* Finally calculate crc32 checksum for dx_tail */
+ checksum = ext4_crc32c(checksum, t,
+ sizeof(struct ext4_directory_dx_tail));
+ t->checksum = orig_checksum;
+ }
+ return checksum;
+}
+
+static struct ext4_directory_dx_countlimit *
+ext4_dir_dx_get_countlimit(struct ext4_inode_ref *inode_ref,
+ struct ext4_directory_entry_ll *dirent,
+ int *offset)
+{
+ struct ext4_directory_entry_ll *dp;
+ struct ext4_directory_dx_root *root;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+ int count_offset;
+
+ if (ext4_dir_entry_ll_get_entry_length(dirent) ==
+ ext4_sb_get_block_size(sb))
+ count_offset = 8;
+ else if (ext4_dir_entry_ll_get_entry_length(dirent) == 12) {
+ root = (struct ext4_directory_dx_root *)dirent;
+ dp = (struct ext4_directory_entry_ll *)&root->dots[1];
+ if (ext4_dir_entry_ll_get_entry_length(dp) !=
+ ext4_sb_get_block_size(sb) - 12)
+ return NULL;
+ if (root->info.reserved_zero ||
+ root->info.info_length != sizeof(struct ext4_directory_dx_root_info))
+ return NULL;
+ count_offset = 32;
+ } else
+ return NULL;
+
+ if (offset)
+ *offset = count_offset;
+ return (struct ext4_directory_dx_countlimit *)(((char *)dirent) + count_offset);
+}
+
+/*
+ * BIG FAT NOTES:
+ * Currently we do not verify the checksum of HTree node.
+ */
+__unused static int
+ext4_dir_dx_checksum_verify(struct ext4_inode_ref *inode_ref,
+ struct ext4_directory_entry_ll *dirent)
+{
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+ int count_offset, limit, count;
+
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ struct ext4_directory_dx_countlimit *countlimit =
+ ext4_dir_dx_get_countlimit(inode_ref, dirent, &count_offset);
+ if (!countlimit) {
+ /* Directory seems corrupted. */
+ return 1;
+ }
+ struct ext4_directory_dx_tail *t;
+ limit = ext4_dir_dx_countlimit_get_limit(countlimit);
+ count = ext4_dir_dx_countlimit_get_count(countlimit);
+ if (count_offset + (limit * sizeof(struct ext4_directory_dx_entry)) >
+ ext4_sb_get_block_size(sb) -
+ sizeof(struct ext4_directory_dx_tail)) {
+ /* There is no space to hold the checksum */
+ return 1;
+ }
+ t = (struct ext4_directory_dx_tail *)
+ (((struct ext4_directory_dx_entry *)countlimit) + limit);
+
+ if (t->checksum != to_le32(ext4_dir_dx_checksum(inode_ref,
+ dirent,
+ count_offset,
+ count, t)))
+ return 0;
+ }
+ return 1;
+}
+
+static void
+ext4_dir_set_dx_checksum(struct ext4_inode_ref *inode_ref,
+ struct ext4_directory_entry_ll *dirent)
+{
+ int count_offset, limit, count;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ struct ext4_directory_dx_countlimit *countlimit =
+ ext4_dir_dx_get_countlimit(inode_ref, dirent, &count_offset);
+ if (!countlimit) {
+ /* Directory seems corrupted. */
+ return;
+ }
+ struct ext4_directory_dx_tail *t;
+ limit = ext4_dir_dx_countlimit_get_limit(countlimit);
+ count = ext4_dir_dx_countlimit_get_count(countlimit);
+ if (count_offset + (limit * sizeof(struct ext4_directory_dx_entry)) >
+ ext4_sb_get_block_size(sb) -
+ sizeof(struct ext4_directory_dx_tail)) {
+ /* There is no space to hold the checksum */
+ return;
+ }
+ t = (struct ext4_directory_dx_tail *)
+ (((struct ext4_directory_dx_entry *)countlimit) + limit);
+
+ t->checksum =
+ to_le32(ext4_dir_dx_checksum(inode_ref, dirent, count_offset, count, t));
+ }
+}
+
/****************************************************************************/
int ext4_dir_dx_init(struct ext4_inode_ref *dir)
{
/* Load block 0, where will be index root located */
- uint32_t fblock;
- int rc = ext4_fs_get_inode_data_block_index(dir, 0, &fblock);
+ ext4_fsblk_t fblock;
+ struct ext4_sblock *sb = &dir->fs->sb;
+ int rc = ext4_fs_get_inode_data_block_index(dir, 0, &fblock, false);
if (rc != EOK)
return rc;
uint32_t entry_space = block_size -
2 * sizeof(struct ext4_directory_dx_dot_entry) -
sizeof(struct ext4_directory_dx_root_info);
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ entry_space -= sizeof(struct ext4_directory_dx_tail);
uint16_t root_limit =
entry_space / sizeof(struct ext4_directory_dx_entry);
+
ext4_dir_dx_countlimit_set_limit(countlimit, root_limit);
/* Append new block, where will be new entries inserted in the future */
/* Fill the whole block with empty entry */
struct ext4_directory_entry_ll *block_entry = (void *)new_block.data;
- ext4_dir_entry_ll_set_entry_length(block_entry, block_size);
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ ext4_dir_entry_ll_set_entry_length(block_entry,
+ block_size -
+ sizeof(struct ext4_directory_entry_tail));
+ ext4_dir_entry_ll_set_name_length(sb,
+ block_entry,
+ 0);
+ ext4_dir_entry_ll_set_inode_type(sb,
+ block_entry,
+ EXT4_DIRENTRY_UNKNOWN);
+
+ initialize_dir_tail(EXT4_DIRENT_TAIL(block_entry,
+ ext4_sb_get_block_size(sb)));
+ ext4_dir_set_checksum(dir,
+ (struct ext4_directory_entry_ll *)new_block.data);
+ } else {
+ ext4_dir_entry_ll_set_entry_length(block_entry, block_size);
+ }
+
ext4_dir_entry_ll_set_inode(block_entry, 0);
new_block.dirty = true;
struct ext4_directory_dx_entry *entry = root->entries;
ext4_dir_dx_entry_set_block(entry, iblock);
+ ext4_dir_set_dx_checksum(dir,
+ (struct ext4_directory_entry_ll *)block.data);
block.dirty = true;
return ext4_block_set(dir->fs->bdev, &block);
indirect_level--;
- uint32_t fblock;
+ ext4_fsblk_t fblock;
int rc = ext4_fs_get_inode_data_block_index(
- inode_ref, next_block, &fblock);
+ inode_ref, next_block, &fblock, false);
if (rc != EOK)
return rc;
/* Fill new path */
while (num_handles--) {
uint32_t block_idx = ext4_dir_dx_entry_get_block(p->position);
- uint32_t block_addr;
+ ext4_fsblk_t block_addr;
int rc = ext4_fs_get_inode_data_block_index(
- inode_ref, block_idx, &block_addr);
+ inode_ref, block_idx, &block_addr, false);
if (rc != EOK)
return rc;
if (rc != EOK)
return rc;
- memcpy(&p->block, &p->block, sizeof(block));
+ memcpy(&p->block, &block, sizeof(block));
p->entries =
((struct ext4_directory_dx_node *)block.data)->entries;
p->position = p->entries;
const char *name)
{
/* Load direct block 0 (index root) */
- uint32_t root_block_addr;
+ ext4_fsblk_t root_block_addr;
int rc2;
int rc =
- ext4_fs_get_inode_data_block_index(inode_ref, 0, &root_block_addr);
+ ext4_fs_get_inode_data_block_index(inode_ref,
+ 0, &root_block_addr, false);
if (rc != EOK)
return rc;
/* Load leaf block */
uint32_t leaf_block_idx =
ext4_dir_dx_entry_get_block(dx_block->position);
- uint32_t leaf_block_addr;
+ ext4_fsblk_t leaf_block_addr;
rc = ext4_fs_get_inode_data_block_index(
- inode_ref, leaf_block_idx, &leaf_block_addr);
+ inode_ref, leaf_block_idx, &leaf_block_addr,
+ false);
if (rc != EOK)
goto cleanup;
/**@brief Insert new index entry to block.
* Note that space for new entry must be checked by caller.
+ * @param inode_ref Directory i-node
* @param index_block Block where to insert new entry
* @param hash Hash value covered by child node
* @param iblock Logical number of child block
*
*/
static void
-ext4_dir_dx_insert_entry(struct ext4_directory_dx_block *index_block,
+ext4_dir_dx_insert_entry(struct ext4_inode_ref *inode_ref,
+ struct ext4_directory_dx_block *index_block,
uint32_t hash, uint32_t iblock)
{
struct ext4_directory_dx_entry *old_index_entry = index_block->position;
ext4_dir_dx_countlimit_set_count(countlimit, count + 1);
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)index_block->block.data);
index_block->block.dirty = true;
}
ext4_dir_dx_entry_comparator);
#endif
/* Allocate new block for store the second part of entries */
- uint32_t new_fblock;
+ ext4_fsblk_t new_fblock;
uint32_t new_iblock;
rc = ext4_fs_append_inode_block(inode_ref, &new_fblock, &new_iblock);
if (rc != EOK) {
uint32_t offset = 0;
void *ptr;
+ if (ext4_sb_has_feature_read_only(&inode_ref->fs->sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ block_size -= sizeof(struct ext4_directory_entry_tail);
+
/* First part - to the old block */
for (i = 0; i < mid; ++i) {
ptr = old_data_block->data + offset;
offset += sort_array[i].rec_len;
}
+ block_size = ext4_sb_get_block_size(&inode_ref->fs->sb);
+
/* Do some steps to finish operation */
+ if (ext4_sb_has_feature_read_only(&inode_ref->fs->sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ initialize_dir_tail(EXT4_DIRENT_TAIL(old_data_block->data,
+ block_size));
+ initialize_dir_tail(EXT4_DIRENT_TAIL(new_data_block_tmp.data,
+ block_size));
+ }
+ ext4_dir_set_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)old_data_block->data);
+ ext4_dir_set_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)new_data_block_tmp.data);
old_data_block->dirty = true;
new_data_block_tmp.dirty = true;
free(sort_array);
free(entry_buffer);
- ext4_dir_dx_insert_entry(index_block, new_hash + continued, new_iblock);
+ ext4_dir_dx_insert_entry(inode_ref,
+ index_block,
+ new_hash + continued, new_iblock);
*new_data_block = new_data_block_tmp;
struct ext4_directory_dx_block *dx_block,
struct ext4_directory_dx_block **new_dx_block)
{
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
struct ext4_directory_dx_entry *entries;
if (dx_block == dx_blocks)
return ENOSPC;
/* Add new block to directory */
- uint32_t new_fblock;
+ ext4_fsblk_t new_fblock;
uint32_t new_iblock;
int rc = ext4_fs_append_inode_block(inode_ref, &new_fblock,
&new_iblock);
uint32_t entry_space =
block_size -
sizeof(struct ext4_fake_directory_entry);
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ entry_space -= sizeof(struct ext4_directory_dx_tail);
uint32_t node_limit =
entry_space /
sizeof(struct ext4_directory_dx_entry);
+
ext4_dir_dx_countlimit_set_limit(right_countlimit,
node_limit);
uint32_t position_index =
(dx_block->position - dx_block->entries);
if (position_index >= count_left) {
+ ext4_dir_set_dx_checksum(
+ inode_ref,
+ (struct ext4_directory_entry_ll *)
+ dx_block->block.data);
dx_block->block.dirty = true;
struct ext4_block block_tmp = dx_block->block;
}
/* Finally insert new entry */
- ext4_dir_dx_insert_entry(dx_blocks, hash_right,
+ ext4_dir_dx_insert_entry(inode_ref,
+ dx_blocks, hash_right,
new_iblock);
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)
+ dx_blocks[0].block.data);
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)
+ dx_blocks[1].block.data);
dx_blocks[0].block.dirty = true;
dx_blocks[1].block.dirty = true;
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)
+ new_block.data);
new_block.dirty = true;
return ext4_block_set(inode_ref->fs->bdev, &new_block);
} else {
uint32_t entry_space =
block_size -
sizeof(struct ext4_fake_directory_entry);
+ if (ext4_sb_has_feature_read_only(sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ entry_space -= sizeof(struct ext4_directory_dx_tail);
uint32_t node_limit =
entry_space /
sizeof(struct ext4_directory_dx_entry);
*new_dx_block = dx_block;
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)
+ dx_blocks[0].block.data);
+ ext4_dir_set_dx_checksum(inode_ref,
+ (struct ext4_directory_entry_ll *)
+ dx_blocks[1].block.data);
dx_blocks[0].block.dirty = true;
dx_blocks[1].block.dirty = true;
}
int rc2 = EOK;
/* Get direct block 0 (index root) */
- uint32_t root_block_addr;
+ ext4_fsblk_t root_block_addr;
int rc =
- ext4_fs_get_inode_data_block_index(parent, 0, &root_block_addr);
+ ext4_fs_get_inode_data_block_index(parent,
+ 0, &root_block_addr,
+ false);
if (rc != EOK)
return rc;
/* Try to insert to existing data block */
uint32_t leaf_block_idx =
ext4_dir_dx_entry_get_block(dx_block->position);
- uint32_t leaf_block_addr;
+ ext4_fsblk_t leaf_block_addr;
rc = ext4_fs_get_inode_data_block_index(parent, leaf_block_idx,
- &leaf_block_addr);
+ &leaf_block_addr,
+ false);
if (rc != EOK)
goto release_index;
goto release_index;
/* Check if insert operation passed */
- rc = ext4_dir_try_insert_entry(&fs->sb, &target_block, child, name,
+ rc = ext4_dir_try_insert_entry(&fs->sb, parent, &target_block, child, name,
name_len);
if (rc == EOK)
goto release_target_index;
uint32_t new_block_hash =
ext4_dir_dx_entry_get_hash(dx_block->position + 1);
if (hinfo.hash >= new_block_hash)
- rc = ext4_dir_try_insert_entry(&fs->sb, &new_block, child, name,
+ rc = ext4_dir_try_insert_entry(&fs->sb, parent, &new_block, child, name,
name_len);
else
- rc = ext4_dir_try_insert_entry(&fs->sb, &target_block, child,
+ rc = ext4_dir_try_insert_entry(&fs->sb, parent, &target_block, child,
name, name_len);
/* Cleanup */
uint32_t parent_inode)
{
/* Load block 0, where will be index root located */
- uint32_t fblock;
- int rc = ext4_fs_get_inode_data_block_index(dir, 0, &fblock);
+ ext4_fsblk_t fblock;
+ int rc = ext4_fs_get_inode_data_block_index(dir, 0, &fblock, false);
if (rc != EOK)
return rc;
/* Fill the inode field with a new parent ino. */
ext4_dx_dot_entry_set_inode(&root->dots[1], parent_inode);
+ ext4_dir_set_dx_checksum(dir,
+ (struct ext4_directory_entry_ll *)
+ block.data);
block.dirty = true;
return ext4_block_set(dir->fs->bdev, &block);
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