1 #define _LARGEFILE64_SOURCE
2 
3 #define LOG_TAG "f2fs_sparseblock"
4 
5 #include "f2fs_sparseblock.h"
6 
7 #include <errno.h>
8 #include <f2fs_fs.h>
9 #include <fcntl.h>
10 #include <linux/types.h>
11 #include <malloc.h>
12 #include <string.h>
13 #include <sys/stat.h>
14 #include <sys/types.h>
15 #include <unistd.h>
16 
17 #include <log/log.h>
18 
19 #define D_DISP_u32(ptr, member)           \
20   do {                \
21     SLOGD("%-30s" "\t\t[0x%#08x : %u]\n",    \
22       #member, le32_to_cpu((ptr)->member), le32_to_cpu((ptr)->member) );  \
23   } while (0);
24 
25 #define D_DISP_u64(ptr, member)           \
26   do {                \
27     SLOGD("%-30s" "\t\t[0x%#016llx : %llu]\n",    \
28       #member, le64_to_cpu((ptr)->member), le64_to_cpu((ptr)->member) );  \
29   } while (0);
30 
31 #define segno_in_journal(jnl, i)    ((jnl)->sit_j.entries[i].segno)
32 
33 #define sit_in_journal(jnl, i)      ((jnl)->sit_j.entries[i].se)
34 
dbg_print_raw_sb_info(struct f2fs_super_block * sb)35 static void dbg_print_raw_sb_info(struct f2fs_super_block *sb)
36 {
37     SLOGD("\n");
38     SLOGD("+--------------------------------------------------------+\n");
39     SLOGD("| Super block                                            |\n");
40     SLOGD("+--------------------------------------------------------+\n");
41 
42     D_DISP_u32(sb, magic);
43     D_DISP_u32(sb, major_ver);
44     D_DISP_u32(sb, minor_ver);
45     D_DISP_u32(sb, log_sectorsize);
46     D_DISP_u32(sb, log_sectors_per_block);
47 
48     D_DISP_u32(sb, log_blocksize);
49     D_DISP_u32(sb, log_blocks_per_seg);
50     D_DISP_u32(sb, segs_per_sec);
51     D_DISP_u32(sb, secs_per_zone);
52     D_DISP_u32(sb, checksum_offset);
53     D_DISP_u64(sb, block_count);
54 
55     D_DISP_u32(sb, section_count);
56     D_DISP_u32(sb, segment_count);
57     D_DISP_u32(sb, segment_count_ckpt);
58     D_DISP_u32(sb, segment_count_sit);
59     D_DISP_u32(sb, segment_count_nat);
60 
61     D_DISP_u32(sb, segment_count_ssa);
62     D_DISP_u32(sb, segment_count_main);
63     D_DISP_u32(sb, segment0_blkaddr);
64 
65     D_DISP_u32(sb, cp_blkaddr);
66     D_DISP_u32(sb, sit_blkaddr);
67     D_DISP_u32(sb, nat_blkaddr);
68     D_DISP_u32(sb, ssa_blkaddr);
69     D_DISP_u32(sb, main_blkaddr);
70 
71     D_DISP_u32(sb, root_ino);
72     D_DISP_u32(sb, node_ino);
73     D_DISP_u32(sb, meta_ino);
74     D_DISP_u32(sb, cp_payload);
75     SLOGD("\n");
76 }
dbg_print_raw_ckpt_struct(struct f2fs_checkpoint * cp)77 static void dbg_print_raw_ckpt_struct(struct f2fs_checkpoint *cp)
78 {
79     SLOGD("\n");
80     SLOGD("+--------------------------------------------------------+\n");
81     SLOGD("| Checkpoint                                             |\n");
82     SLOGD("+--------------------------------------------------------+\n");
83 
84     D_DISP_u64(cp, checkpoint_ver);
85     D_DISP_u64(cp, user_block_count);
86     D_DISP_u64(cp, valid_block_count);
87     D_DISP_u32(cp, rsvd_segment_count);
88     D_DISP_u32(cp, overprov_segment_count);
89     D_DISP_u32(cp, free_segment_count);
90 
91     D_DISP_u32(cp, alloc_type[CURSEG_HOT_NODE]);
92     D_DISP_u32(cp, alloc_type[CURSEG_WARM_NODE]);
93     D_DISP_u32(cp, alloc_type[CURSEG_COLD_NODE]);
94     D_DISP_u32(cp, cur_node_segno[0]);
95     D_DISP_u32(cp, cur_node_segno[1]);
96     D_DISP_u32(cp, cur_node_segno[2]);
97 
98     D_DISP_u32(cp, cur_node_blkoff[0]);
99     D_DISP_u32(cp, cur_node_blkoff[1]);
100     D_DISP_u32(cp, cur_node_blkoff[2]);
101 
102 
103     D_DISP_u32(cp, alloc_type[CURSEG_HOT_DATA]);
104     D_DISP_u32(cp, alloc_type[CURSEG_WARM_DATA]);
105     D_DISP_u32(cp, alloc_type[CURSEG_COLD_DATA]);
106     D_DISP_u32(cp, cur_data_segno[0]);
107     D_DISP_u32(cp, cur_data_segno[1]);
108     D_DISP_u32(cp, cur_data_segno[2]);
109 
110     D_DISP_u32(cp, cur_data_blkoff[0]);
111     D_DISP_u32(cp, cur_data_blkoff[1]);
112     D_DISP_u32(cp, cur_data_blkoff[2]);
113 
114     D_DISP_u32(cp, ckpt_flags);
115     D_DISP_u32(cp, cp_pack_total_block_count);
116     D_DISP_u32(cp, cp_pack_start_sum);
117     D_DISP_u32(cp, valid_node_count);
118     D_DISP_u32(cp, valid_inode_count);
119     D_DISP_u32(cp, next_free_nid);
120     D_DISP_u32(cp, sit_ver_bitmap_bytesize);
121     D_DISP_u32(cp, nat_ver_bitmap_bytesize);
122     D_DISP_u32(cp, checksum_offset);
123     D_DISP_u64(cp, elapsed_time);
124 
125     D_DISP_u32(cp, sit_nat_version_bitmap[0]);
126     SLOGD("\n\n");
127 }
128 
dbg_print_info_struct(struct f2fs_info * info)129 static void dbg_print_info_struct(struct f2fs_info *info)
130 {
131     SLOGD("\n");
132     SLOGD("+--------------------------------------------------------+\n");
133     SLOGD("| F2FS_INFO                                              |\n");
134     SLOGD("+--------------------------------------------------------+\n");
135     SLOGD("blocks_per_segment: %" PRIu64, info->blocks_per_segment);
136     SLOGD("block_size: %d", info->block_size);
137     SLOGD("sit_bmp loc: %p", info->sit_bmp);
138     SLOGD("sit_bmp_size: %d", info->sit_bmp_size);
139     SLOGD("blocks_per_sit: %" PRIu64, info->blocks_per_sit);
140     SLOGD("sit_blocks loc: %p", info->sit_blocks);
141     SLOGD("sit_sums loc: %p", info->sit_sums);
142     SLOGD("sit_sums num: %d", le16_to_cpu(info->sit_sums->journal.n_sits));
143     unsigned int i;
144     for(i = 0; i < (le16_to_cpu(info->sit_sums->journal.n_sits)); i++) {
145         SLOGD("entry %d in journal entries is for segment %d", i,
146               le32_to_cpu(segno_in_journal(&info->sit_sums->journal, i)));
147     }
148 
149     SLOGD("cp_blkaddr: %" PRIu64, info->cp_blkaddr);
150     SLOGD("cp_valid_cp_blkaddr: %" PRIu64, info->cp_valid_cp_blkaddr);
151     SLOGD("sit_blkaddr: %" PRIu64, info->sit_blkaddr);
152     SLOGD("nat_blkaddr: %" PRIu64, info->nat_blkaddr);
153     SLOGD("ssa_blkaddr: %" PRIu64, info->ssa_blkaddr);
154     SLOGD("main_blkaddr: %" PRIu64, info->main_blkaddr);
155     SLOGD("total_user_used: %" PRIu64, info->total_user_used);
156     SLOGD("total_blocks: %" PRIu64, info->total_blocks);
157     SLOGD("\n\n");
158 }
159 
160 
161 /* read blocks */
read_structure(int fd,unsigned long long start,void * buf,ssize_t len)162 static int read_structure(int fd, unsigned long long start, void *buf, ssize_t len)
163 {
164     off64_t ret;
165 
166     ret = lseek64(fd, start, SEEK_SET);
167     if (ret < 0) {
168         SLOGE("failed to seek\n");
169         return ret;
170     }
171 
172     ret = read(fd, buf, len);
173     if (ret < 0) {
174         SLOGE("failed to read\n");
175         return ret;
176     }
177     if (ret != len) {
178         SLOGE("failed to read all\n");
179         return -1;
180     }
181     return 0;
182 }
183 
read_structure_blk(int fd,unsigned long long start_blk,void * buf,size_t len)184 static int read_structure_blk(int fd, unsigned long long start_blk, void *buf, size_t len)
185 {
186     return read_structure(fd, F2FS_BLKSIZE*start_blk, buf, F2FS_BLKSIZE * len);
187 }
188 
read_f2fs_sb(int fd,struct f2fs_super_block * sb)189 static int read_f2fs_sb(int fd, struct f2fs_super_block *sb)
190 {
191     int rc;
192     rc = read_structure(fd, F2FS_SUPER_OFFSET, sb, sizeof(*sb));
193     if (le32_to_cpu(sb->magic) != F2FS_SUPER_MAGIC) {
194         SLOGE("Not a valid F2FS super block. Magic:%#08x != %#08x",
195                                   le32_to_cpu(sb->magic), F2FS_SUPER_MAGIC);
196         return -1;
197     }
198     return 0;
199 }
200 
get_f2fs_filesystem_size_sec(char * dev)201 unsigned int get_f2fs_filesystem_size_sec(char *dev)
202 {
203     int fd;
204     if ((fd = open(dev, O_RDONLY)) < 0) {
205         SLOGE("Cannot open device to get filesystem size ");
206         return 0;
207     }
208     struct f2fs_super_block sb;
209     if(read_f2fs_sb(fd, &sb))
210         return 0;
211     return (unsigned int)(le64_to_cpu(sb.block_count)*F2FS_BLKSIZE/DEFAULT_SECTOR_SIZE);
212 }
213 
validate_checkpoint(block_t cp_addr,unsigned long long * version,int fd)214 static struct f2fs_checkpoint *validate_checkpoint(block_t cp_addr,
215                                                    unsigned long long *version, int fd)
216 {
217     unsigned char *cp_block_1, *cp_block_2;
218     struct f2fs_checkpoint *cp_block;
219     uint64_t cp1_version = 0, cp2_version = 0;
220 
221     cp_block_1 = malloc(F2FS_BLKSIZE);
222     if (!cp_block_1)
223         return NULL;
224 
225     /* Read the 1st cp block in this CP pack */
226     if (read_structure_blk(fd, cp_addr, cp_block_1, 1))
227         goto invalid_cp1;
228 
229     /* get the version number */
230     cp_block = (struct f2fs_checkpoint *)cp_block_1;
231 
232     cp1_version = le64_to_cpu(cp_block->checkpoint_ver);
233 
234     cp_block_2 = malloc(F2FS_BLKSIZE);
235     if (!cp_block_2) {
236         goto invalid_cp1;
237     }
238     /* Read the 2nd cp block in this CP pack */
239     cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
240     if (read_structure_blk(fd, cp_addr, cp_block_2, 1)) {
241         goto invalid_cp2;
242     }
243 
244     cp_block = (struct f2fs_checkpoint *)cp_block_2;
245 
246     cp2_version = le64_to_cpu(cp_block->checkpoint_ver);
247 
248     if (cp2_version == cp1_version) {
249         *version = cp2_version;
250         free(cp_block_2);
251         return (struct f2fs_checkpoint *)cp_block_1;
252     }
253 
254     /* There must be something wrong with this checkpoint */
255 invalid_cp2:
256     free(cp_block_2);
257 invalid_cp1:
258     free(cp_block_1);
259     return NULL;
260 }
261 
get_valid_checkpoint_info(int fd,struct f2fs_super_block * sb,struct f2fs_checkpoint ** cp,struct f2fs_info * info)262 int get_valid_checkpoint_info(int fd, struct f2fs_super_block *sb, struct f2fs_checkpoint **cp,  struct f2fs_info *info)
263 {
264     struct f2fs_checkpoint *cp1, *cp2, *cur_cp;
265     unsigned long blk_size;
266     unsigned long long cp1_version = 0, cp2_version = 0;
267     unsigned long long cp1_start_blk_no;
268     unsigned long long cp2_start_blk_no;
269 
270     blk_size = 1U << le32_to_cpu(sb->log_blocksize);
271 
272     /*
273      * Find valid cp by reading both packs and finding most recent one.
274      */
275     cp1_start_blk_no = le32_to_cpu(sb->cp_blkaddr);
276     cp1 = validate_checkpoint(cp1_start_blk_no, &cp1_version, fd);
277 
278     /* The second checkpoint pack should start at the next segment */
279     cp2_start_blk_no = cp1_start_blk_no + (1 << le32_to_cpu(sb->log_blocks_per_seg));
280     cp2 = validate_checkpoint(cp2_start_blk_no, &cp2_version, fd);
281 
282     if (cp1 && cp2) {
283         if (ver_after(cp2_version, cp1_version)) {
284             cur_cp = cp2;
285             info->cp_valid_cp_blkaddr = cp2_start_blk_no;
286             free(cp1);
287         } else {
288             cur_cp = cp1;
289             info->cp_valid_cp_blkaddr = cp1_start_blk_no;
290             free(cp2);
291         }
292     } else if (cp1) {
293         cur_cp = cp1;
294         info->cp_valid_cp_blkaddr = cp1_start_blk_no;
295     } else if (cp2) {
296         cur_cp = cp2;
297         info->cp_valid_cp_blkaddr = cp2_start_blk_no;
298     } else {
299         goto fail_no_cp;
300     }
301 
302     *cp = cur_cp;
303 
304     return 0;
305 
306 fail_no_cp:
307     SLOGE("Valid Checkpoint not found!!");
308     return -EINVAL;
309 }
310 
gather_sit_info(int fd,struct f2fs_info * info)311 static int gather_sit_info(int fd, struct f2fs_info *info)
312 {
313     uint64_t num_segments = (info->total_blocks - info->main_blkaddr
314             + info->blocks_per_segment - 1) / info->blocks_per_segment;
315     uint64_t num_sit_blocks = (num_segments + SIT_ENTRY_PER_BLOCK - 1) / SIT_ENTRY_PER_BLOCK;
316     uint64_t sit_block;
317 
318     info->sit_blocks = malloc(num_sit_blocks * sizeof(struct f2fs_sit_block));
319     if (!info->sit_blocks)
320         return -1;
321 
322     for(sit_block = 0; sit_block<num_sit_blocks; sit_block++) {
323         off64_t address = info->sit_blkaddr + sit_block;
324 
325         if (f2fs_test_bit(sit_block, info->sit_bmp))
326             address += info->blocks_per_sit;
327 
328         SLOGD("Reading cache block starting at block %"PRIu64, address);
329         if (read_structure(fd, address * F2FS_BLKSIZE, &info->sit_blocks[sit_block], sizeof(struct f2fs_sit_block))) {
330             SLOGE("Could not read sit block at block %"PRIu64, address);
331             free(info->sit_blocks);
332             info->sit_blocks = NULL;
333             return -1;
334         }
335     }
336     return 0;
337 }
338 
is_set_ckpt_flags(struct f2fs_checkpoint * cp,unsigned int f)339 static inline int is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
340 {
341     unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
342     return !!(ckpt_flags & f);
343 }
344 
sum_blk_addr(struct f2fs_checkpoint * cp,struct f2fs_info * info,int base,int type)345 static inline uint64_t sum_blk_addr(struct f2fs_checkpoint *cp, struct f2fs_info *info, int base, int type)
346 {
347     return info->cp_valid_cp_blkaddr + le32_to_cpu(cp->cp_pack_total_block_count)
348                 - (base + 1) + type;
349 }
350 
get_sit_summary(int fd,struct f2fs_info * info,struct f2fs_checkpoint * cp)351 static int get_sit_summary(int fd, struct f2fs_info *info, struct f2fs_checkpoint *cp)
352 {
353     char buffer[F2FS_BLKSIZE];
354 
355     info->sit_sums = calloc(1, sizeof(struct f2fs_summary_block));
356     if (!info->sit_sums)
357         return -1;
358 
359     /* CURSEG_COLD_DATA where the journaled SIT entries are. */
360     if (is_set_ckpt_flags(cp, CP_COMPACT_SUM_FLAG)) {
361         if (read_structure_blk(fd, info->cp_valid_cp_blkaddr + le32_to_cpu(cp->cp_pack_start_sum), buffer, 1))
362             return -1;
363         memcpy(&info->sit_sums->journal.n_sits, &buffer[SUM_JOURNAL_SIZE], SUM_JOURNAL_SIZE);
364     } else {
365         uint64_t blk_addr;
366         if (is_set_ckpt_flags(cp, CP_UMOUNT_FLAG))
367             blk_addr = sum_blk_addr(cp, info, NR_CURSEG_TYPE, CURSEG_COLD_DATA);
368         else
369             blk_addr = sum_blk_addr(cp, info, NR_CURSEG_DATA_TYPE, CURSEG_COLD_DATA);
370 
371         if (read_structure_blk(fd, blk_addr, buffer, 1))
372             return -1;
373 
374         memcpy(info->sit_sums, buffer, sizeof(struct f2fs_summary_block));
375     }
376     return 0;
377 }
378 
generate_f2fs_info(int fd)379 struct f2fs_info *generate_f2fs_info(int fd)
380 {
381     struct f2fs_super_block *sb = NULL;
382     struct f2fs_checkpoint *cp = NULL;
383     struct f2fs_info *info;
384 
385     info = calloc(1, sizeof(*info));
386     if (!info) {
387         SLOGE("Out of memory!");
388         return NULL;
389     }
390 
391     sb = malloc(sizeof(*sb));
392     if(!sb) {
393         SLOGE("Out of memory!");
394         free(info);
395         return NULL;
396     }
397     if (read_f2fs_sb(fd, sb)) {
398         SLOGE("Failed to read superblock");
399         free(info);
400         free(sb);
401         return NULL;
402     }
403     dbg_print_raw_sb_info(sb);
404 
405     info->cp_blkaddr = le32_to_cpu(sb->cp_blkaddr);
406     info->sit_blkaddr = le32_to_cpu(sb->sit_blkaddr);
407     info->nat_blkaddr = le32_to_cpu(sb->nat_blkaddr);
408     info->ssa_blkaddr = le32_to_cpu(sb->ssa_blkaddr);
409     info->main_blkaddr = le32_to_cpu(sb->main_blkaddr);
410     info->block_size = F2FS_BLKSIZE;
411     info->total_blocks = sb->block_count;
412     info->blocks_per_sit = (le32_to_cpu(sb->segment_count_sit) >> 1) << le32_to_cpu(sb->log_blocks_per_seg);
413     info->blocks_per_segment = 1U << le32_to_cpu(sb->log_blocks_per_seg);
414 
415     if (get_valid_checkpoint_info(fd, sb, &cp, info))
416         goto error;
417     dbg_print_raw_ckpt_struct(cp);
418 
419     info->total_user_used = le32_to_cpu(cp->valid_block_count);
420 
421     u32 bmp_size = le32_to_cpu(cp->sit_ver_bitmap_bytesize);
422 
423     /* get sit validity bitmap */
424     info->sit_bmp = malloc(bmp_size);
425     if(!info->sit_bmp) {
426         SLOGE("Out of memory!");
427         goto error;
428     }
429 
430     info->sit_bmp_size = bmp_size;
431     if (read_structure(fd, info->cp_valid_cp_blkaddr * F2FS_BLKSIZE
432                    + offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap),
433                    info->sit_bmp, bmp_size)) {
434         SLOGE("Error getting SIT validity bitmap");
435         goto error;
436     }
437 
438     if (gather_sit_info(fd , info)) {
439         SLOGE("Error getting SIT information");
440         goto error;
441     }
442     if (get_sit_summary(fd, info, cp)) {
443         SLOGE("Error getting SIT entries in summary area");
444         goto error;
445     }
446     dbg_print_info_struct(info);
447     return info;
448 error:
449     free(sb);
450     free(cp);
451     free_f2fs_info(info);
452     return NULL;
453 }
454 
free_f2fs_info(struct f2fs_info * info)455 void free_f2fs_info(struct f2fs_info *info)
456 {
457     if (info) {
458         free(info->sit_blocks);
459         info->sit_blocks = NULL;
460 
461         free(info->sit_bmp);
462         info->sit_bmp = NULL;
463 
464         free(info->sit_sums);
465         info->sit_sums = NULL;
466     }
467     free(info);
468 }
469 
get_num_blocks_used(struct f2fs_info * info)470 uint64_t get_num_blocks_used(struct f2fs_info *info)
471 {
472     return info->main_blkaddr + info->total_user_used;
473 }
474 
f2fs_test_bit(unsigned int nr,const char * p)475 int f2fs_test_bit(unsigned int nr, const char *p)
476 {
477     int mask;
478     char *addr = (char *)p;
479 
480     addr += (nr >> 3);
481     mask = 1 << (7 - (nr & 0x07));
482     return (mask & *addr) != 0;
483 }
484 
run_on_used_blocks(uint64_t startblock,struct f2fs_info * info,int (* func)(uint64_t pos,void * data),void * data)485 int run_on_used_blocks(uint64_t startblock, struct f2fs_info *info, int (*func)(uint64_t pos, void *data), void *data) {
486     struct f2fs_sit_entry * sit_entry;
487     uint64_t sit_block_num_cur = 0, segnum = 0, block_offset;
488     uint64_t block;
489     unsigned int used, found, i;
490 
491     block = startblock;
492     while (block < info->total_blocks) {
493         /* TODO: Save only relevant portions of metadata */
494         if (block < info->main_blkaddr) {
495             if (func(block, data)) {
496                 SLOGI("func error");
497                 return -1;
498             }
499         } else {
500             /* Main Section */
501             segnum = (block - info->main_blkaddr)/info->blocks_per_segment;
502 
503             /* check the SIT entries in the journal */
504             found = 0;
505             for(i = 0; i < le16_to_cpu(info->sit_sums->journal.n_sits); i++) {
506                 if (le32_to_cpu(segno_in_journal(&info->sit_sums->journal, i)) == segnum) {
507                     sit_entry = &sit_in_journal(&info->sit_sums->journal, i);
508                     found = 1;
509                     break;
510                 }
511             }
512 
513             /* get SIT entry from SIT section */
514             if (!found) {
515                 sit_block_num_cur = segnum / SIT_ENTRY_PER_BLOCK;
516                 sit_entry = &info->sit_blocks[sit_block_num_cur].entries[segnum % SIT_ENTRY_PER_BLOCK];
517             }
518 
519             block_offset = (block - info->main_blkaddr) % info->blocks_per_segment;
520 
521             if (block_offset == 0 && GET_SIT_VBLOCKS(sit_entry) == 0) {
522                 block += info->blocks_per_segment;
523                 continue;
524             }
525 
526             used = f2fs_test_bit(block_offset, (char *)sit_entry->valid_map);
527             if(used)
528                 if (func(block, data))
529                     return -1;
530         }
531 
532         block++;
533     }
534     return 0;
535 }
536 
537 struct privdata
538 {
539     int count;
540     int infd;
541     int outfd;
542     char* buf;
543     char *zbuf;
544     int done;
545     struct f2fs_info *info;
546 };
547 
548 
549 /*
550  * This is a simple test program. It performs a block to block copy of a
551  * filesystem, replacing blocks identified as unused with 0's.
552  */
553 
copy_used(uint64_t pos,void * data)554 int copy_used(uint64_t pos, void *data)
555 {
556     struct privdata *d = data;
557     char *buf;
558     int pdone = (pos * 100) / d->info->total_blocks;
559     if (pdone > d->done) {
560         d->done = pdone;
561         printf("Done with %d percent\n", d->done);
562     }
563 
564     d->count++;
565     buf = d->buf;
566     if(read_structure_blk(d->infd, (unsigned long long)pos, d->buf, 1)) {
567         printf("Error reading!!!\n");
568         return -1;
569     }
570 
571     off64_t ret;
572     ret = lseek64(d->outfd, pos * F2FS_BLKSIZE, SEEK_SET);
573     if (ret < 0) {
574         SLOGE("failed to seek\n");
575         return ret;
576     }
577 
578     ret = write(d->outfd, d->buf, F2FS_BLKSIZE);
579     if (ret < 0) {
580         SLOGE("failed to write\n");
581         return ret;
582     }
583     if (ret != F2FS_BLKSIZE) {
584         SLOGE("failed to read all\n");
585         return -1;
586     }
587     return 0;
588 }
589 
main(int argc,char ** argv)590 int main(int argc, char **argv)
591 {
592     if (argc != 3)
593         printf("Usage: %s fs_file_in fs_file_out\n", argv[0]);
594     char *in = argv[1];
595     char *out = argv[2];
596     int infd, outfd;
597 
598     if ((infd = open(in, O_RDONLY)) < 0) {
599         SLOGE("Cannot open device");
600         return 0;
601     }
602     if ((outfd = open(out, O_WRONLY|O_CREAT, S_IRUSR | S_IWUSR)) < 0) {
603         SLOGE("Cannot open output");
604         return 0;
605     }
606 
607     struct privdata d;
608     d.infd = infd;
609     d.outfd = outfd;
610     d.count = 0;
611     struct f2fs_info *info = generate_f2fs_info(infd);
612     if (!info) {
613         printf("Failed to generate info!");
614         return -1;
615     }
616     char *buf = malloc(F2FS_BLKSIZE);
617     char *zbuf = calloc(1, F2FS_BLKSIZE);
618     d.buf = buf;
619     d.zbuf = zbuf;
620     d.done = 0;
621     d.info = info;
622     int expected_count = get_num_blocks_used(info);
623     run_on_used_blocks(0, info, &copy_used, &d);
624     printf("Copied %d blocks. Expected to copy %d\n", d.count, expected_count);
625     ftruncate64(outfd, info->total_blocks * F2FS_BLKSIZE);
626     free_f2fs_info(info);
627     free(buf);
628     free(zbuf);
629     close(infd);
630     close(outfd);
631     return 0;
632 }
633