errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
ext2_inode_scan *ret_scan)
{
ext2_inode_scan scan;
errcode_t retval;
errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks);
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/*
* If fs->badblocks isn't set, then set it --- since the inode
* scanning functions require it.
*/
if (fs->badblocks == 0) {
/*
* Temporarly save fs->get_blocks and set it to zero,
* for compatibility with old e2fsck's.
*/
save_get_blocks = fs->get_blocks;
fs->get_blocks = 0;
retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
if (retval && fs->badblocks) {
ext2fs_badblocks_list_free(fs->badblocks);
fs->badblocks = 0;
}
fs->get_blocks = save_get_blocks;
}
retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan);
if (retval)
return retval;
memset(scan, 0, sizeof(struct ext2_struct_inode_scan));
scan->magic = EXT2_ET_MAGIC_INODE_SCAN;
scan->fs = fs;
scan->inode_size = EXT2_INODE_SIZE(fs->super);
scan->bytes_left = 0;
scan->current_group = 0;
scan->groups_left = fs->group_desc_count - 1;
scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks :
EXT2_INODE_SCAN_DEFAULT_BUFFER_BLOCKS;
scan->current_block = ext2fs_inode_table_loc(scan->fs,
scan->current_group);
scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
scan->blocks_left = scan->fs->inode_blocks_per_group;
if (ext2fs_has_group_desc_csum(fs)) {
__u32 unused = ext2fs_bg_itable_unused(fs, scan->current_group);
if (scan->inodes_left > unused)
scan->inodes_left -= unused;
else
scan->inodes_left = 0;
scan->blocks_left =
(scan->inodes_left +
(fs->blocksize / scan->inode_size - 1)) *
scan->inode_size / fs->blocksize;
}
retval = io_channel_alloc_buf(fs->io, scan->inode_buffer_blocks,
&scan->inode_buffer);
scan->done_group = 0;
scan->done_group_data = 0;
scan->bad_block_ptr = 0;
if (retval) {
ext2fs_free_mem(&scan);
return retval;
}
retval = ext2fs_get_mem(scan->inode_size + scan->inode_buffer_blocks,
&scan->temp_buffer);
if (retval) {
ext2fs_free_mem(&scan->inode_buffer);
ext2fs_free_mem(&scan);
return retval;
}
memset(SCAN_BLOCK_STATUS(scan), 0, scan->inode_buffer_blocks);
if (scan->fs->badblocks && scan->fs->badblocks->num)
scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS;
if (ext2fs_has_group_desc_csum(fs))
scan->scan_flags |= EXT2_SF_DO_LAZY;
*ret_scan = scan;
return 0;
}
errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
ext2_inode_scan *ret_scan)
{
ext2_inode_scan scan;
errcode_t retval;
errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks);
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/*
* If fs->badblocks isn't set, then set it --- since the inode
* scanning functions require it.
*/
if (fs->badblocks == 0) {
/*
* Temporarly save fs->get_blocks and set it to zero,
* for compatibility with old e2fsck's.
*/
save_get_blocks = fs->get_blocks;
fs->get_blocks = 0;
retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
if (retval && fs->badblocks) {
ext2fs_badblocks_list_free(fs->badblocks);
fs->badblocks = 0;
}
fs->get_blocks = save_get_blocks;
}
retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan);
if (retval)
return retval;
memset(scan, 0, sizeof(struct ext2_struct_inode_scan));
scan->magic = EXT2_ET_MAGIC_INODE_SCAN;
scan->fs = fs;
scan->inode_size = EXT2_INODE_SIZE(fs->super);
scan->bytes_left = 0;
scan->current_group = 0;
scan->groups_left = fs->group_desc_count - 1;
scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8;
scan->current_block = scan->fs->
group_desc[scan->current_group].bg_inode_table;
scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
scan->blocks_left = scan->fs->inode_blocks_per_group;
if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
scan->inodes_left -=
fs->group_desc[scan->current_group].bg_itable_unused;
scan->blocks_left =
(scan->inodes_left +
(fs->blocksize / scan->inode_size - 1)) *
scan->inode_size / fs->blocksize;
}
retval = ext2fs_get_memalign(scan->inode_buffer_blocks * fs->blocksize,
fs->blocksize, &scan->inode_buffer);
scan->done_group = 0;
scan->done_group_data = 0;
scan->bad_block_ptr = 0;
if (retval) {
ext2fs_free_mem(&scan);
return retval;
}
retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer);
if (retval) {
ext2fs_free_mem(&scan->inode_buffer);
ext2fs_free_mem(&scan);
return retval;
}
if (scan->fs->badblocks && scan->fs->badblocks->num)
scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS;
if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
scan->scan_flags |= EXT2_SF_DO_LAZY;
*ret_scan = scan;
return 0;
}
