1 /**
2 * defrag.c
3 *
4 * Copyright (c) 2015 Jaegeuk Kim <jaegeuk@kernel.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include "fsck.h"
11
migrate_block(struct f2fs_sb_info * sbi,u64 from,u64 to)12 static int migrate_block(struct f2fs_sb_info *sbi, u64 from, u64 to)
13 {
14 void *raw = calloc(BLOCK_SZ, 1);
15 struct seg_entry *se;
16 struct f2fs_summary sum;
17 u64 offset;
18 int ret, type;
19
20 ASSERT(raw != NULL);
21
22 /* read from */
23 ret = dev_read_block(raw, from);
24 ASSERT(ret >= 0);
25
26 /* write to */
27 ret = dev_write_block(raw, to);
28 ASSERT(ret >= 0);
29
30 /* update sit bitmap & valid_blocks && se->type */
31 se = get_seg_entry(sbi, GET_SEGNO(sbi, from));
32 offset = OFFSET_IN_SEG(sbi, from);
33 type = se->type;
34 se->valid_blocks--;
35 f2fs_clear_bit(offset, (char *)se->cur_valid_map);
36 se->dirty = 1;
37
38 se = get_seg_entry(sbi, GET_SEGNO(sbi, to));
39 offset = OFFSET_IN_SEG(sbi, to);
40 se->type = type;
41 se->valid_blocks++;
42 f2fs_set_bit(offset, (char *)se->cur_valid_map);
43 se->dirty = 1;
44
45 /* read/write SSA */
46 get_sum_entry(sbi, from, &sum);
47 update_sum_entry(sbi, to, &sum);
48
49 /* if data block, read node and update node block */
50 if (IS_DATASEG(type))
51 update_data_blkaddr(sbi, le32_to_cpu(sum.nid),
52 le16_to_cpu(sum.ofs_in_node), to);
53 else
54 update_nat_blkaddr(sbi, 0, le32_to_cpu(sum.nid), to);
55
56 DBG(0, "Migrate %s block %"PRIx64" -> %"PRIx64"\n",
57 IS_DATASEG(type) ? "data" : "node",
58 from, to);
59 free(raw);
60 return 0;
61 }
62
f2fs_defragment(struct f2fs_sb_info * sbi,u64 from,u64 len,u64 to,int left)63 int f2fs_defragment(struct f2fs_sb_info *sbi, u64 from, u64 len, u64 to, int left)
64 {
65 struct seg_entry *se;
66 u64 idx, offset;
67
68 /* flush NAT/SIT journal entries */
69 flush_journal_entries(sbi);
70
71 for (idx = from; idx < from + len; idx++) {
72 u64 target = to;
73
74 se = get_seg_entry(sbi, GET_SEGNO(sbi, idx));
75 offset = OFFSET_IN_SEG(sbi, idx);
76
77 if (!f2fs_test_bit(offset, (const char *)se->cur_valid_map))
78 continue;
79
80 if (find_next_free_block(sbi, &target, left, se->type)) {
81 MSG(0, "Not enough space to migrate blocks");
82 return -1;
83 }
84
85 if (migrate_block(sbi, idx, target)) {
86 ASSERT_MSG("Found inconsistency: please run FSCK");
87 return -1;
88 }
89 }
90
91 /* update curseg info; can update sit->types */
92 move_curseg_info(sbi, to, left);
93 zero_journal_entries(sbi);
94 write_curseg_info(sbi);
95
96 /* flush dirty sit entries */
97 flush_sit_entries(sbi);
98
99 write_checkpoint(sbi);
100
101 return 0;
102 }
103