2 * alloc_tables.c --- Allocate tables for a newly initialized
3 * filesystem. Used by mke2fs when initializing a filesystem
5 * Copyright (C) 1996 Theodore Ts'o.
8 * This file may be redistributed under the terms of the GNU Library
9 * General Public License, version 2.
25 #include <sys/types.h>
33 * This routine searches for free blocks that can allocate a full
34 * group of bitmaps or inode tables for a flexbg group. Returns the
35 * block number with a correct offset were the bitmaps and inode
36 * tables can be allocated continously and in order.
38 static blk64_t flexbg_offset(ext2_filsys fs, dgrp_t group, blk64_t start_blk,
39 ext2fs_block_bitmap bmap, int rem_grp,
42 int flexbg, flexbg_size, size;
43 blk64_t last_blk, first_free = 0;
46 flexbg_size = 1 << fs->super->s_log_groups_per_flex;
47 flexbg = group / flexbg_size;
48 size = rem_grp * elem_size;
50 if (size > (int) (fs->super->s_blocks_per_group / 8))
51 size = (int) fs->super->s_blocks_per_group / 8;
54 * Don't do a long search if the previous block
55 * search is still valid.
57 if (start_blk && ext2fs_test_block_bitmap_range2(bmap, start_blk,
61 start_blk = ext2fs_group_first_block2(fs, flexbg_size * flexbg);
62 last_grp = group | (flexbg_size - 1);
63 if (last_grp > fs->group_desc_count-1)
64 last_grp = fs->group_desc_count-1;
65 last_blk = ext2fs_group_last_block2(fs, last_grp);
67 /* Find the first available block */
68 if (ext2fs_get_free_blocks2(fs, start_blk, last_blk, size,
69 bmap, &first_free) == 0)
72 if (ext2fs_get_free_blocks2(fs, start_blk, last_blk, elem_size,
73 bmap, &first_free) == 0)
76 if (ext2fs_get_free_blocks2(fs, 0, last_blk, elem_size, bmap,
83 errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
84 ext2fs_block_bitmap bmap)
88 blk64_t group_blk, start_blk, last_blk, new_blk, blk;
90 int rem_grps = 0, flexbg_size = 0;
92 group_blk = ext2fs_group_first_block2(fs, group);
93 last_blk = ext2fs_group_last_block2(fs, group);
98 if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
99 EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
100 fs->super->s_log_groups_per_flex) {
101 flexbg_size = 1 << fs->super->s_log_groups_per_flex;
102 last_grp = group | (flexbg_size - 1);
103 if (last_grp > fs->group_desc_count-1)
104 last_grp = fs->group_desc_count-1;
105 rem_grps = last_grp - group + 1;
109 * Allocate the block and inode bitmaps, if necessary
112 retval = ext2fs_get_free_blocks2(fs, group_blk, last_blk,
113 1, bmap, &start_blk);
116 start_blk += fs->inode_blocks_per_group;
117 start_blk += ((fs->stride * group) %
118 (last_blk - start_blk + 1));
119 if (start_blk >= last_blk)
120 start_blk = group_blk;
122 start_blk = group_blk;
125 blk64_t prev_block = 0;
127 if (group % flexbg_size)
128 prev_block = ext2fs_block_bitmap_loc(fs, group - 1) + 1;
129 start_blk = flexbg_offset(fs, group, prev_block, bmap,
131 last_blk = ext2fs_group_last_block2(fs, last_grp);
134 if (!ext2fs_block_bitmap_loc(fs, group)) {
135 retval = ext2fs_get_free_blocks2(fs, start_blk, last_blk,
137 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
138 retval = ext2fs_get_free_blocks2(fs, group_blk,
139 last_blk, 1, bmap, &new_blk);
142 ext2fs_mark_block_bitmap2(bmap, new_blk);
143 ext2fs_block_bitmap_loc_set(fs, group, new_blk);
145 dgrp_t gr = ext2fs_group_of_blk2(fs, new_blk);
146 ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
147 ext2fs_free_blocks_count_add(fs->super, -1);
148 ext2fs_bg_flags_clear(fs, gr, EXT2_BG_BLOCK_UNINIT);
149 ext2fs_group_desc_csum_set(fs, gr);
154 blk64_t prev_block = 0;
155 if (group % flexbg_size)
156 prev_block = ext2fs_inode_bitmap_loc(fs, group - 1) + 1;
158 prev_block = ext2fs_block_bitmap_loc(fs, group) +
160 start_blk = flexbg_offset(fs, group, prev_block, bmap,
162 last_blk = ext2fs_group_last_block2(fs, last_grp);
165 if (!ext2fs_inode_bitmap_loc(fs, group)) {
166 retval = ext2fs_get_free_blocks2(fs, start_blk, last_blk,
168 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
169 retval = ext2fs_get_free_blocks2(fs, group_blk,
170 last_blk, 1, bmap, &new_blk);
173 ext2fs_mark_block_bitmap2(bmap, new_blk);
174 ext2fs_inode_bitmap_loc_set(fs, group, new_blk);
176 dgrp_t gr = ext2fs_group_of_blk2(fs, new_blk);
177 ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
178 ext2fs_free_blocks_count_add(fs->super, -1);
179 ext2fs_bg_flags_clear(fs, gr, EXT2_BG_BLOCK_UNINIT);
180 ext2fs_group_desc_csum_set(fs, gr);
185 * Allocate the inode table
188 blk64_t prev_block = 0;
190 if (group % flexbg_size)
191 prev_block = ext2fs_inode_table_loc(fs, group - 1) +
192 fs->inode_blocks_per_group;
194 prev_block = ext2fs_inode_bitmap_loc(fs, group) +
197 group_blk = flexbg_offset(fs, group, prev_block, bmap,
198 rem_grps, fs->inode_blocks_per_group);
199 last_blk = ext2fs_group_last_block2(fs, last_grp);
202 if (!ext2fs_inode_table_loc(fs, group)) {
203 retval = ext2fs_get_free_blocks2(fs, group_blk, last_blk,
204 fs->inode_blocks_per_group,
208 for (j=0, blk = new_blk;
209 j < fs->inode_blocks_per_group;
211 ext2fs_mark_block_bitmap2(bmap, blk);
213 dgrp_t gr = ext2fs_group_of_blk2(fs, blk);
214 ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
215 ext2fs_free_blocks_count_add(fs->super, -1);
216 ext2fs_bg_flags_clear(fs, gr,
217 EXT2_BG_BLOCK_UNINIT);
218 ext2fs_group_desc_csum_set(fs, gr);
221 ext2fs_inode_table_loc_set(fs, group, new_blk);
223 ext2fs_group_desc_csum_set(fs, group);
227 errcode_t ext2fs_allocate_tables(ext2_filsys fs)
231 struct ext2fs_numeric_progress_struct progress;
233 ext2fs_numeric_progress_init(fs, &progress, NULL,
234 fs->group_desc_count);
236 for (i = 0; i < fs->group_desc_count; i++) {
237 ext2fs_numeric_progress_update(fs, &progress, i);
238 retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
242 ext2fs_numeric_progress_close(fs, &progress, NULL);