/**
* Constructs a full data block representation from the specified minimal block
* entry. The resultant block's pointers are populated via hash table lookups.
*
* @param out_block On success, this gets populated with the data
* block information.
* @param block_entry The source block entry to convert.
*
* @return 0 on success; nonzero on failure.
*/
int
nffs_block_from_hash_entry(struct nffs_block *out_block,
struct nffs_hash_entry *block_entry)
{
struct nffs_disk_block disk_block;
uint32_t area_offset;
uint8_t area_idx;
int rc;
assert(nffs_hash_id_is_block(block_entry->nhe_id));
nffs_flash_loc_expand(block_entry->nhe_flash_loc, &area_idx, &area_offset);
rc = nffs_block_read_disk(area_idx, area_offset, &disk_block);
if (rc != 0) {
return rc;
}
out_block->nb_hash_entry = block_entry;
rc = nffs_block_from_disk(out_block, &disk_block, area_idx, area_offset);
if (rc != 0) {
return rc;
}
return 0;
}
/**
* Constructs a block representation from a minimal block hash entry. If the
* hash entry references other objects (inode or previous data block), the
* resulting block object is populated with pointers to the referenced objects.
* If the any referenced objects are not present in the NFFS RAM
* representation, this indicates file system corruption. In this case, the
* resulting block is populated with all valid references, and an FS_ECORRUPT
* code is returned.
*
* @param out_block On success, this gets populated with the data
* block information.
* @param block_entry The source block entry to convert.
*
* @return 0 on success;
* FS_ECORRUPT if one or more pointers could not
* be filled in due to file system corruption;
* FS_EOFFSET on an attempt to read an invalid
* address range;
* FS_EHW on flash error;
* FS_EUNEXP if the specified disk location does
* not contain a block.
*/
int
nffs_block_from_hash_entry(struct nffs_block *out_block,
struct nffs_hash_entry *block_entry)
{
struct nffs_disk_block disk_block;
uint32_t area_offset;
uint8_t area_idx;
int rc;
assert(nffs_hash_id_is_block(block_entry->nhe_id));
if (nffs_block_is_dummy(block_entry)) {
out_block->nb_hash_entry = block_entry;
out_block->nb_inode_entry = NULL;
out_block->nb_prev = NULL;
/*
* Dummy block added when inode was read in before real block
* (see nffs_restore_inode()). Return success (because there's
* too many places that ned to check for this,
* but it's the responsibility fo the upstream code to check
* whether this is still a dummy entry. XXX
*/
return 0;
/*return FS_ENOENT;*/
}
nffs_flash_loc_expand(block_entry->nhe_flash_loc, &area_idx, &area_offset);
rc = nffs_block_read_disk(area_idx, area_offset, &disk_block);
if (rc != 0) {
return rc;
}
out_block->nb_hash_entry = block_entry;
rc = nffs_block_from_disk(out_block, &disk_block);
if (rc != 0) {
return rc;
}
return 0;
}
