/* * Stupid algorithm --- we now just search forward starting from the * goal. Should put in a smarter one someday.... */ errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal, ext2fs_block_bitmap map, blk64_t *ret) { blk64_t i; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); if (!map) map = fs->block_map; if (!map) return EXT2_ET_NO_BLOCK_BITMAP; if (!goal || (goal >= fs->super->s_blocks_count)) goal = fs->super->s_first_data_block; i = goal; check_block_uninit(fs, map, (i - fs->super->s_first_data_block) / EXT2_BLOCKS_PER_GROUP(fs->super)); do { if (((i - fs->super->s_first_data_block) % EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) check_block_uninit(fs, map, (i - fs->super->s_first_data_block) / EXT2_BLOCKS_PER_GROUP(fs->super)); if (!ext2fs_fast_test_block_bitmap2(map, i)) { *ret = i; return 0; } i++; if (i >= fs->super->s_blocks_count) i = fs->super->s_first_data_block; } while (i != goal); return EXT2_ET_BLOCK_ALLOC_FAIL; }
/* * Stupid algorithm --- we now just search forward starting from the * goal. Should put in a smarter one someday.... */ errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal, ext2fs_block_bitmap map, blk64_t *ret) { blk64_t i; int c_ratio; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); if (!map) map = fs->block_map; if (!map) return EXT2_ET_NO_BLOCK_BITMAP; if (!goal || (goal >= ext2fs_blocks_count(fs->super))) goal = fs->super->s_first_data_block; i = goal; c_ratio = 1 << ext2fs_get_bitmap_granularity(map); if (c_ratio > 1) goal &= ~EXT2FS_CLUSTER_MASK(fs); check_block_uninit(fs, map, (i - fs->super->s_first_data_block) / EXT2_BLOCKS_PER_GROUP(fs->super)); do { if (((i - fs->super->s_first_data_block) % EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) check_block_uninit(fs, map, (i - fs->super->s_first_data_block) / EXT2_BLOCKS_PER_GROUP(fs->super)); if (!ext2fs_fast_test_block_bitmap2(map, i)) { *ret = i; return 0; } i = (i + c_ratio) & ~(c_ratio - 1); if (i >= ext2fs_blocks_count(fs->super)) i = fs->super->s_first_data_block; } while (i != goal); return EXT2_ET_BLOCK_ALLOC_FAIL; }
/* * Check for uninit inode bitmaps and deal with them appropriately */ static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map, dgrp_t group) { ext2_ino_t i, ino; if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) || !(fs->group_desc[group].bg_flags & EXT2_BG_INODE_UNINIT)) return; ino = (group * fs->super->s_inodes_per_group) + 1; for (i=0; i < fs->super->s_inodes_per_group; i++, ino++) ext2fs_fast_unmark_inode_bitmap2(map, ino); fs->group_desc[group].bg_flags &= ~EXT2_BG_INODE_UNINIT; check_block_uninit(fs, fs->block_map, group); }
/* * Check for uninit inode bitmaps and deal with them appropriately */ static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map, dgrp_t group) { ext2_ino_t i, ino; if (!ext2fs_has_group_desc_csum(fs) || !(ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT))) return; ino = (group * fs->super->s_inodes_per_group) + 1; for (i=0; i < fs->super->s_inodes_per_group; i++, ino++) ext2fs_fast_unmark_inode_bitmap2(map, ino); ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT); ext2fs_group_desc_csum_set(fs, group); ext2fs_mark_ib_dirty(fs); ext2fs_mark_super_dirty(fs); check_block_uninit(fs, fs->block_map, group); }