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26#include "qemu/osdep.h"
27#include <dirent.h>
28#include "qapi/error.h"
29#include "block/block_int.h"
30#include "block/qdict.h"
31#include "qemu/module.h"
32#include "qemu/option.h"
33#include "qemu/bswap.h"
34#include "migration/blocker.h"
35#include "qapi/qmp/qdict.h"
36#include "qapi/qmp/qstring.h"
37#include "qemu/cutils.h"
38#include "qemu/error-report.h"
39
40#ifndef S_IWGRP
41#define S_IWGRP 0
42#endif
43#ifndef S_IWOTH
44#define S_IWOTH 0
45#endif
46
47
48
49
50
51
52
53
54
55
56
57#ifdef DEBUG
58
59#define DLOG(a) a
60
61static void checkpoint(void);
62
63#else
64
65#define DLOG(a)
66
67#endif
68
69
70
71
72
73#define BOOTSECTOR_OEM_NAME "MSWIN4.1"
74
75#define DIR_DELETED 0xe5
76#define DIR_KANJI DIR_DELETED
77#define DIR_KANJI_FAKE 0x05
78#define DIR_FREE 0x00
79
80
81typedef struct array_t {
82 char* pointer;
83 unsigned int size,next,item_size;
84} array_t;
85
86static inline void array_init(array_t* array,unsigned int item_size)
87{
88 array->pointer = NULL;
89 array->size=0;
90 array->next=0;
91 array->item_size=item_size;
92}
93
94static inline void array_free(array_t* array)
95{
96 g_free(array->pointer);
97 array->size=array->next=0;
98}
99
100
101static inline void* array_get(array_t* array,unsigned int index) {
102 assert(index < array->next);
103 assert(array->pointer);
104 return array->pointer + index * array->item_size;
105}
106
107static inline void array_ensure_allocated(array_t *array, int index)
108{
109 if((index + 1) * array->item_size > array->size) {
110 int new_size = (index + 32) * array->item_size;
111 array->pointer = g_realloc(array->pointer, new_size);
112 assert(array->pointer);
113 memset(array->pointer + array->size, 0, new_size - array->size);
114 array->size = new_size;
115 array->next = index + 1;
116 }
117}
118
119static inline void* array_get_next(array_t* array) {
120 unsigned int next = array->next;
121
122 array_ensure_allocated(array, next);
123 array->next = next + 1;
124 return array_get(array, next);
125}
126
127static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
128 if((array->next+count)*array->item_size>array->size) {
129 int increment=count*array->item_size;
130 array->pointer=g_realloc(array->pointer,array->size+increment);
131 if(!array->pointer)
132 return NULL;
133 array->size+=increment;
134 }
135 memmove(array->pointer+(index+count)*array->item_size,
136 array->pointer+index*array->item_size,
137 (array->next-index)*array->item_size);
138 array->next+=count;
139 return array->pointer+index*array->item_size;
140}
141
142
143
144static inline int array_roll(array_t* array,int index_to,int index_from,int count)
145{
146 char* buf;
147 char* from;
148 char* to;
149 int is;
150
151 if(!array ||
152 index_to<0 || index_to>=array->next ||
153 index_from<0 || index_from>=array->next)
154 return -1;
155
156 if(index_to==index_from)
157 return 0;
158
159 is=array->item_size;
160 from=array->pointer+index_from*is;
161 to=array->pointer+index_to*is;
162 buf=g_malloc(is*count);
163 memcpy(buf,from,is*count);
164
165 if(index_to<index_from)
166 memmove(to+is*count,to,from-to);
167 else
168 memmove(from,from+is*count,to-from);
169
170 memcpy(to,buf,is*count);
171
172 g_free(buf);
173
174 return 0;
175}
176
177static inline int array_remove_slice(array_t* array,int index, int count)
178{
179 assert(index >=0);
180 assert(count > 0);
181 assert(index + count <= array->next);
182 if(array_roll(array,array->next-1,index,count))
183 return -1;
184 array->next -= count;
185 return 0;
186}
187
188static int array_remove(array_t* array,int index)
189{
190 return array_remove_slice(array, index, 1);
191}
192
193
194static int array_index(array_t* array, void* pointer)
195{
196 size_t offset = (char*)pointer - array->pointer;
197 assert((offset % array->item_size) == 0);
198 assert(offset/array->item_size < array->next);
199 return offset/array->item_size;
200}
201
202
203
204
205typedef struct bootsector_t {
206 uint8_t jump[3];
207 uint8_t name[8];
208 uint16_t sector_size;
209 uint8_t sectors_per_cluster;
210 uint16_t reserved_sectors;
211 uint8_t number_of_fats;
212 uint16_t root_entries;
213 uint16_t total_sectors16;
214 uint8_t media_type;
215 uint16_t sectors_per_fat;
216 uint16_t sectors_per_track;
217 uint16_t number_of_heads;
218 uint32_t hidden_sectors;
219 uint32_t total_sectors;
220 union {
221 struct {
222 uint8_t drive_number;
223 uint8_t reserved1;
224 uint8_t signature;
225 uint32_t id;
226 uint8_t volume_label[11];
227 uint8_t fat_type[8];
228 uint8_t ignored[0x1c0];
229 } QEMU_PACKED fat16;
230 struct {
231 uint32_t sectors_per_fat;
232 uint16_t flags;
233 uint8_t major,minor;
234 uint32_t first_cluster_of_root_dir;
235 uint16_t info_sector;
236 uint16_t backup_boot_sector;
237 uint8_t reserved[12];
238 uint8_t drive_number;
239 uint8_t reserved1;
240 uint8_t signature;
241 uint32_t id;
242 uint8_t volume_label[11];
243 uint8_t fat_type[8];
244 uint8_t ignored[0x1a4];
245 } QEMU_PACKED fat32;
246 } u;
247 uint8_t magic[2];
248} QEMU_PACKED bootsector_t;
249
250typedef struct {
251 uint8_t head;
252 uint8_t sector;
253 uint8_t cylinder;
254} mbr_chs_t;
255
256typedef struct partition_t {
257 uint8_t attributes;
258 mbr_chs_t start_CHS;
259 uint8_t fs_type;
260 mbr_chs_t end_CHS;
261 uint32_t start_sector_long;
262 uint32_t length_sector_long;
263} QEMU_PACKED partition_t;
264
265typedef struct mbr_t {
266 uint8_t ignored[0x1b8];
267 uint32_t nt_id;
268 uint8_t ignored2[2];
269 partition_t partition[4];
270 uint8_t magic[2];
271} QEMU_PACKED mbr_t;
272
273typedef struct direntry_t {
274 uint8_t name[8 + 3];
275 uint8_t attributes;
276 uint8_t reserved[2];
277 uint16_t ctime;
278 uint16_t cdate;
279 uint16_t adate;
280 uint16_t begin_hi;
281 uint16_t mtime;
282 uint16_t mdate;
283 uint16_t begin;
284 uint32_t size;
285} QEMU_PACKED direntry_t;
286
287
288
289typedef struct mapping_t {
290
291 uint32_t begin,end;
292
293 unsigned int dir_index;
294
295 int first_mapping_index;
296 union {
297
298
299
300
301 struct {
302 uint32_t offset;
303 } file;
304 struct {
305 int parent_mapping_index;
306 int first_dir_index;
307 } dir;
308 } info;
309
310 char* path;
311
312 enum {
313 MODE_UNDEFINED = 0,
314 MODE_NORMAL = 1,
315 MODE_MODIFIED = 2,
316 MODE_DIRECTORY = 4,
317 MODE_DELETED = 8,
318 } mode;
319 int read_only;
320} mapping_t;
321
322#ifdef DEBUG
323static void print_direntry(const struct direntry_t*);
324static void print_mapping(const struct mapping_t* mapping);
325#endif
326
327
328
329typedef struct BDRVVVFATState {
330 CoMutex lock;
331 BlockDriverState* bs;
332 unsigned char first_sectors[0x40*0x200];
333
334 int fat_type;
335 array_t fat,directory,mapping;
336 char volume_label[11];
337
338 uint32_t offset_to_bootsector;
339
340 unsigned int cluster_size;
341 unsigned int sectors_per_cluster;
342 unsigned int sectors_per_fat;
343 uint32_t last_cluster_of_root_directory;
344
345 uint16_t root_entries;
346 uint32_t sector_count;
347 uint32_t cluster_count;
348 uint32_t max_fat_value;
349 uint32_t offset_to_fat;
350 uint32_t offset_to_root_dir;
351
352 int current_fd;
353 mapping_t* current_mapping;
354 unsigned char* cluster;
355 unsigned char* cluster_buffer;
356 unsigned int current_cluster;
357
358
359 char* qcow_filename;
360 BdrvChild* qcow;
361 void* fat2;
362 char* used_clusters;
363 array_t commits;
364 const char* path;
365 int downcase_short_names;
366
367 Error *migration_blocker;
368} BDRVVVFATState;
369
370
371
372
373
374static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs)
375{
376 int head,sector;
377 sector = spos % secs; spos /= secs;
378 head = spos % heads; spos /= heads;
379 if (spos >= cyls) {
380
381
382
383 chs->head = 0xFF;
384 chs->sector = 0xFF;
385 chs->cylinder = 0xFF;
386 return 1;
387 }
388 chs->head = (uint8_t)head;
389 chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
390 chs->cylinder = (uint8_t)spos;
391 return 0;
392}
393
394static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
395{
396
397 mbr_t* real_mbr=(mbr_t*)s->first_sectors;
398 partition_t* partition = &(real_mbr->partition[0]);
399 int lba;
400
401 memset(s->first_sectors,0,512);
402
403
404 real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
405
406 partition->attributes=0x80;
407
408
409 lba = sector2CHS(&partition->start_CHS, s->offset_to_bootsector,
410 cyls, heads, secs);
411 lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
412 cyls, heads, secs);
413
414
415 partition->start_sector_long = cpu_to_le32(s->offset_to_bootsector);
416 partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
417 - s->offset_to_bootsector);
418
419
420
421
422 partition->fs_type = s->fat_type == 12 ? 0x1 :
423 s->fat_type == 16 ? (lba ? 0xe : 0x06) :
424 (lba ? 0xc : 0x0b);
425
426 real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
427}
428
429
430
431static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
432{
433 int number_of_entries, i;
434 glong length;
435 direntry_t *entry;
436
437 gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
438 if (!longname) {
439 fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
440 return NULL;
441 }
442
443 number_of_entries = DIV_ROUND_UP(length * 2, 26);
444
445 for(i=0;i<number_of_entries;i++) {
446 entry=array_get_next(&(s->directory));
447 entry->attributes=0xf;
448 entry->reserved[0]=0;
449 entry->begin=0;
450 entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
451 }
452 for(i=0;i<26*number_of_entries;i++) {
453 int offset=(i%26);
454 if(offset<10) offset=1+offset;
455 else if(offset<22) offset=14+offset-10;
456 else offset=28+offset-22;
457 entry=array_get(&(s->directory),s->directory.next-1-(i/26));
458 if (i >= 2 * length + 2) {
459 entry->name[offset] = 0xff;
460 } else if (i % 2 == 0) {
461 entry->name[offset] = longname[i / 2] & 0xff;
462 } else {
463 entry->name[offset] = longname[i / 2] >> 8;
464 }
465 }
466 g_free(longname);
467 return array_get(&(s->directory),s->directory.next-number_of_entries);
468}
469
470static char is_free(const direntry_t* direntry)
471{
472 return direntry->name[0] == DIR_DELETED || direntry->name[0] == DIR_FREE;
473}
474
475static char is_volume_label(const direntry_t* direntry)
476{
477 return direntry->attributes == 0x28;
478}
479
480static char is_long_name(const direntry_t* direntry)
481{
482 return direntry->attributes == 0xf;
483}
484
485static char is_short_name(const direntry_t* direntry)
486{
487 return !is_volume_label(direntry) && !is_long_name(direntry)
488 && !is_free(direntry);
489}
490
491static char is_directory(const direntry_t* direntry)
492{
493 return direntry->attributes & 0x10 && direntry->name[0] != DIR_DELETED;
494}
495
496static inline char is_dot(const direntry_t* direntry)
497{
498 return is_short_name(direntry) && direntry->name[0] == '.';
499}
500
501static char is_file(const direntry_t* direntry)
502{
503 return is_short_name(direntry) && !is_directory(direntry);
504}
505
506static inline uint32_t begin_of_direntry(const direntry_t* direntry)
507{
508 return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
509}
510
511static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
512{
513 return le32_to_cpu(direntry->size);
514}
515
516static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
517{
518 direntry->begin = cpu_to_le16(begin & 0xffff);
519 direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
520}
521
522static uint8_t to_valid_short_char(gunichar c)
523{
524 c = g_unichar_toupper(c);
525 if ((c >= '0' && c <= '9') ||
526 (c >= 'A' && c <= 'Z') ||
527 strchr("$%'-_@~`!(){}^#&", c) != 0) {
528 return c;
529 } else {
530 return 0;
531 }
532}
533
534static direntry_t *create_short_filename(BDRVVVFATState *s,
535 const char *filename,
536 unsigned int directory_start)
537{
538 int i, j = 0;
539 direntry_t *entry = array_get_next(&(s->directory));
540 const gchar *p, *last_dot = NULL;
541 gunichar c;
542 bool lossy_conversion = false;
543 char tail[8];
544
545 if (!entry) {
546 return NULL;
547 }
548 memset(entry->name, 0x20, sizeof(entry->name));
549
550
551 for (p = filename; ; p = g_utf8_next_char(p)) {
552 c = g_utf8_get_char(p);
553 if (c == '\0') {
554 break;
555 } else if (c == '.') {
556 if (j == 0) {
557
558 lossy_conversion = true;
559 } else {
560 if (last_dot) {
561 lossy_conversion = true;
562 }
563 last_dot = p;
564 }
565 } else if (!last_dot) {
566
567 uint8_t v = to_valid_short_char(c);
568 if (j < 8 && v) {
569 entry->name[j++] = v;
570 } else {
571 lossy_conversion = true;
572 }
573 }
574 }
575
576
577 if (last_dot) {
578 j = 0;
579 for (p = g_utf8_next_char(last_dot); ; p = g_utf8_next_char(p)) {
580 c = g_utf8_get_char(p);
581 if (c == '\0') {
582 break;
583 } else {
584
585 uint8_t v = to_valid_short_char(c);
586 if (j < 3 && v) {
587 entry->name[8 + (j++)] = v;
588 } else {
589 lossy_conversion = true;
590 }
591 }
592 }
593 }
594
595 if (entry->name[0] == DIR_KANJI) {
596 entry->name[0] = DIR_KANJI_FAKE;
597 }
598
599
600 for (j = 0; j < 8; j++) {
601 if (entry->name[j] == ' ') {
602 break;
603 }
604 }
605 for (i = lossy_conversion ? 1 : 0; i < 999999; i++) {
606 direntry_t *entry1;
607 if (i > 0) {
608 int len = snprintf(tail, sizeof(tail), "~%u", (unsigned)i);
609 assert(len <= 7);
610 memcpy(entry->name + MIN(j, 8 - len), tail, len);
611 }
612 for (entry1 = array_get(&(s->directory), directory_start);
613 entry1 < entry; entry1++) {
614 if (!is_long_name(entry1) &&
615 !memcmp(entry1->name, entry->name, 11)) {
616 break;
617 }
618 }
619 if (entry1 == entry) {
620
621 return entry;
622 }
623 }
624 return NULL;
625}
626
627
628
629static inline uint8_t fat_chksum(const direntry_t* entry)
630{
631 uint8_t chksum=0;
632 int i;
633
634 for (i = 0; i < ARRAY_SIZE(entry->name); i++) {
635 chksum = (((chksum & 0xfe) >> 1) |
636 ((chksum & 0x01) ? 0x80 : 0)) + entry->name[i];
637 }
638
639 return chksum;
640}
641
642
643static uint16_t fat_datetime(time_t time,int return_time) {
644 struct tm* t;
645 struct tm t1;
646 t = &t1;
647 localtime_r(&time,t);
648 if(return_time)
649 return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
650 return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
651}
652
653static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
654{
655 if(s->fat_type==32) {
656 uint32_t* entry=array_get(&(s->fat),cluster);
657 *entry=cpu_to_le32(value);
658 } else if(s->fat_type==16) {
659 uint16_t* entry=array_get(&(s->fat),cluster);
660 *entry=cpu_to_le16(value&0xffff);
661 } else {
662 int offset = (cluster*3/2);
663 unsigned char* p = array_get(&(s->fat), offset);
664 switch (cluster&1) {
665 case 0:
666 p[0] = value&0xff;
667 p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
668 break;
669 case 1:
670 p[0] = (p[0]&0xf) | ((value&0xf)<<4);
671 p[1] = (value>>4);
672 break;
673 }
674 }
675}
676
677static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
678{
679 if(s->fat_type==32) {
680 uint32_t* entry=array_get(&(s->fat),cluster);
681 return le32_to_cpu(*entry);
682 } else if(s->fat_type==16) {
683 uint16_t* entry=array_get(&(s->fat),cluster);
684 return le16_to_cpu(*entry);
685 } else {
686 const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
687 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
688 }
689}
690
691static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
692{
693 if(fat_entry>s->max_fat_value-8)
694 return -1;
695 return 0;
696}
697
698static inline void init_fat(BDRVVVFATState* s)
699{
700 if (s->fat_type == 12) {
701 array_init(&(s->fat),1);
702 array_ensure_allocated(&(s->fat),
703 s->sectors_per_fat * 0x200 * 3 / 2 - 1);
704 } else {
705 array_init(&(s->fat),(s->fat_type==32?4:2));
706 array_ensure_allocated(&(s->fat),
707 s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
708 }
709 memset(s->fat.pointer,0,s->fat.size);
710
711 switch(s->fat_type) {
712 case 12: s->max_fat_value=0xfff; break;
713 case 16: s->max_fat_value=0xffff; break;
714 case 32: s->max_fat_value=0x0fffffff; break;
715 default: s->max_fat_value=0;
716 }
717
718}
719
720static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
721 unsigned int directory_start, const char* filename, int is_dot)
722{
723 int long_index = s->directory.next;
724 direntry_t* entry = NULL;
725 direntry_t* entry_long = NULL;
726
727 if(is_dot) {
728 entry=array_get_next(&(s->directory));
729 memset(entry->name, 0x20, sizeof(entry->name));
730 memcpy(entry->name,filename,strlen(filename));
731 return entry;
732 }
733
734 entry_long=create_long_filename(s,filename);
735 entry = create_short_filename(s, filename, directory_start);
736
737
738 if(entry_long) {
739 uint8_t chksum=fat_chksum(entry);
740
741
742 entry_long=array_get(&(s->directory),long_index);
743 while(entry_long<entry && is_long_name(entry_long)) {
744 entry_long->reserved[1]=chksum;
745 entry_long++;
746 }
747 }
748
749 return entry;
750}
751
752
753
754
755static int read_directory(BDRVVVFATState* s, int mapping_index)
756{
757 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
758 direntry_t* direntry;
759 const char* dirname = mapping->path;
760 int first_cluster = mapping->begin;
761 int parent_index = mapping->info.dir.parent_mapping_index;
762 mapping_t* parent_mapping = (mapping_t*)
763 (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL);
764 int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
765
766 DIR* dir=opendir(dirname);
767 struct dirent* entry;
768 int i;
769
770 assert(mapping->mode & MODE_DIRECTORY);
771
772 if(!dir) {
773 mapping->end = mapping->begin;
774 return -1;
775 }
776
777 i = mapping->info.dir.first_dir_index =
778 first_cluster == 0 ? 0 : s->directory.next;
779
780 if (first_cluster != 0) {
781
782 (void)create_short_and_long_name(s, i, ".", 1);
783 (void)create_short_and_long_name(s, i, "..", 1);
784 }
785
786
787 while((entry=readdir(dir))) {
788 unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
789 char* buffer;
790 direntry_t* direntry;
791 struct stat st;
792 int is_dot=!strcmp(entry->d_name,".");
793 int is_dotdot=!strcmp(entry->d_name,"..");
794
795 if (first_cluster == 0 && s->directory.next >= s->root_entries - 1) {
796 fprintf(stderr, "Too many entries in root directory\n");
797 closedir(dir);
798 return -2;
799 }
800
801 if(first_cluster == 0 && (is_dotdot || is_dot))
802 continue;
803
804 buffer = g_malloc(length);
805 snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
806
807 if(stat(buffer,&st)<0) {
808 g_free(buffer);
809 continue;
810 }
811
812
813 if (!is_dot && !is_dotdot) {
814 direntry = create_short_and_long_name(s, i, entry->d_name, 0);
815 } else {
816 direntry = array_get(&(s->directory), is_dot ? i : i + 1);
817 }
818 direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
819 direntry->reserved[0]=direntry->reserved[1]=0;
820 direntry->ctime=fat_datetime(st.st_ctime,1);
821 direntry->cdate=fat_datetime(st.st_ctime,0);
822 direntry->adate=fat_datetime(st.st_atime,0);
823 direntry->begin_hi=0;
824 direntry->mtime=fat_datetime(st.st_mtime,1);
825 direntry->mdate=fat_datetime(st.st_mtime,0);
826 if(is_dotdot)
827 set_begin_of_direntry(direntry, first_cluster_of_parent);
828 else if(is_dot)
829 set_begin_of_direntry(direntry, first_cluster);
830 else
831 direntry->begin=0;
832 if (st.st_size > 0x7fffffff) {
833 fprintf(stderr, "File %s is larger than 2GB\n", buffer);
834 g_free(buffer);
835 closedir(dir);
836 return -2;
837 }
838 direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
839
840
841 if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
842 s->current_mapping = array_get_next(&(s->mapping));
843 s->current_mapping->begin=0;
844 s->current_mapping->end=st.st_size;
845
846
847
848
849 s->current_mapping->dir_index=s->directory.next-1;
850 s->current_mapping->first_mapping_index = -1;
851 if (S_ISDIR(st.st_mode)) {
852 s->current_mapping->mode = MODE_DIRECTORY;
853 s->current_mapping->info.dir.parent_mapping_index =
854 mapping_index;
855 } else {
856 s->current_mapping->mode = MODE_UNDEFINED;
857 s->current_mapping->info.file.offset = 0;
858 }
859 s->current_mapping->path=buffer;
860 s->current_mapping->read_only =
861 (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
862 } else {
863 g_free(buffer);
864 }
865 }
866 closedir(dir);
867
868
869 while(s->directory.next%(0x10*s->sectors_per_cluster)) {
870 direntry_t* direntry=array_get_next(&(s->directory));
871 memset(direntry,0,sizeof(direntry_t));
872 }
873
874 if (s->fat_type != 32 &&
875 mapping_index == 0 &&
876 s->directory.next < s->root_entries) {
877
878 int cur = s->directory.next;
879 array_ensure_allocated(&(s->directory), s->root_entries - 1);
880 s->directory.next = s->root_entries;
881 memset(array_get(&(s->directory), cur), 0,
882 (s->root_entries - cur) * sizeof(direntry_t));
883 }
884
885
886 mapping = array_get(&(s->mapping), mapping_index);
887 first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
888 * 0x20 / s->cluster_size;
889 mapping->end = first_cluster;
890
891 direntry = array_get(&(s->directory), mapping->dir_index);
892 set_begin_of_direntry(direntry, mapping->begin);
893
894 return 0;
895}
896
897static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
898{
899 return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
900}
901
902static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
903{
904 return s->offset_to_root_dir + s->sectors_per_cluster * cluster_num;
905}
906
907static int init_directories(BDRVVVFATState* s,
908 const char *dirname, int heads, int secs,
909 Error **errp)
910{
911 bootsector_t* bootsector;
912 mapping_t* mapping;
913 unsigned int i;
914 unsigned int cluster;
915
916 memset(&(s->first_sectors[0]),0,0x40*0x200);
917
918 s->cluster_size=s->sectors_per_cluster*0x200;
919 s->cluster_buffer=g_malloc(s->cluster_size);
920
921
922
923
924
925
926
927
928 i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
929 s->sectors_per_fat=(s->sector_count+i)/i;
930
931 s->offset_to_fat = s->offset_to_bootsector + 1;
932 s->offset_to_root_dir = s->offset_to_fat + s->sectors_per_fat * 2;
933
934 array_init(&(s->mapping),sizeof(mapping_t));
935 array_init(&(s->directory),sizeof(direntry_t));
936
937
938 {
939 direntry_t* entry=array_get_next(&(s->directory));
940 entry->attributes=0x28;
941 memcpy(entry->name, s->volume_label, sizeof(entry->name));
942 }
943
944
945 init_fat(s);
946
947
948 s->root_entries = 0x02 * 0x10 * s->sectors_per_cluster;
949 s->cluster_count=sector2cluster(s, s->sector_count);
950
951 mapping = array_get_next(&(s->mapping));
952 mapping->begin = 0;
953 mapping->dir_index = 0;
954 mapping->info.dir.parent_mapping_index = -1;
955 mapping->first_mapping_index = -1;
956 mapping->path = g_strdup(dirname);
957 i = strlen(mapping->path);
958 if (i > 0 && mapping->path[i - 1] == '/')
959 mapping->path[i - 1] = '\0';
960 mapping->mode = MODE_DIRECTORY;
961 mapping->read_only = 0;
962 s->path = mapping->path;
963
964 for (i = 0, cluster = 0; i < s->mapping.next; i++) {
965
966
967
968 int fix_fat = (i != 0);
969 mapping = array_get(&(s->mapping), i);
970
971 if (mapping->mode & MODE_DIRECTORY) {
972 char *path = mapping->path;
973 mapping->begin = cluster;
974 if(read_directory(s, i)) {
975 error_setg(errp, "Could not read directory %s", path);
976 return -1;
977 }
978 mapping = array_get(&(s->mapping), i);
979 } else {
980 assert(mapping->mode == MODE_UNDEFINED);
981 mapping->mode=MODE_NORMAL;
982 mapping->begin = cluster;
983 if (mapping->end > 0) {
984 direntry_t* direntry = array_get(&(s->directory),
985 mapping->dir_index);
986
987 mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
988 set_begin_of_direntry(direntry, mapping->begin);
989 } else {
990 mapping->end = cluster + 1;
991 fix_fat = 0;
992 }
993 }
994
995 assert(mapping->begin < mapping->end);
996
997
998 cluster = mapping->end;
999
1000 if(cluster > s->cluster_count) {
1001 error_setg(errp,
1002 "Directory does not fit in FAT%d (capacity %.2f MB)",
1003 s->fat_type, s->sector_count / 2000.0);
1004 return -1;
1005 }
1006
1007
1008 if (fix_fat) {
1009 int j;
1010 for(j = mapping->begin; j < mapping->end - 1; j++)
1011 fat_set(s, j, j+1);
1012 fat_set(s, mapping->end - 1, s->max_fat_value);
1013 }
1014 }
1015
1016 mapping = array_get(&(s->mapping), 0);
1017 s->last_cluster_of_root_directory = mapping->end;
1018
1019
1020 fat_set(s,0,s->max_fat_value);
1021 fat_set(s,1,s->max_fat_value);
1022
1023 s->current_mapping = NULL;
1024
1025 bootsector = (bootsector_t *)(s->first_sectors
1026 + s->offset_to_bootsector * 0x200);
1027 bootsector->jump[0]=0xeb;
1028 bootsector->jump[1]=0x3e;
1029 bootsector->jump[2]=0x90;
1030 memcpy(bootsector->name, BOOTSECTOR_OEM_NAME, 8);
1031 bootsector->sector_size=cpu_to_le16(0x200);
1032 bootsector->sectors_per_cluster=s->sectors_per_cluster;
1033 bootsector->reserved_sectors=cpu_to_le16(1);
1034 bootsector->number_of_fats=0x2;
1035 bootsector->root_entries = cpu_to_le16(s->root_entries);
1036 bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
1037
1038 bootsector->media_type = (s->offset_to_bootsector > 0 ? 0xf8 : 0xf0);
1039 s->fat.pointer[0] = bootsector->media_type;
1040 bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
1041 bootsector->sectors_per_track = cpu_to_le16(secs);
1042 bootsector->number_of_heads = cpu_to_le16(heads);
1043 bootsector->hidden_sectors = cpu_to_le32(s->offset_to_bootsector);
1044 bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
1045
1046
1047
1048 bootsector->u.fat16.drive_number = s->offset_to_bootsector == 0 ? 0 : 0x80;
1049 bootsector->u.fat16.signature=0x29;
1050 bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
1051
1052 memcpy(bootsector->u.fat16.volume_label, s->volume_label,
1053 sizeof(bootsector->u.fat16.volume_label));
1054 memcpy(bootsector->u.fat16.fat_type,
1055 s->fat_type == 12 ? "FAT12 " : "FAT16 ", 8);
1056 bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
1057
1058 return 0;
1059}
1060
1061#ifdef DEBUG
1062static BDRVVVFATState *vvv = NULL;
1063#endif
1064
1065static int enable_write_target(BlockDriverState *bs, Error **errp);
1066static int is_consistent(BDRVVVFATState *s);
1067
1068static QemuOptsList runtime_opts = {
1069 .name = "vvfat",
1070 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1071 .desc = {
1072 {
1073 .name = "dir",
1074 .type = QEMU_OPT_STRING,
1075 .help = "Host directory to map to the vvfat device",
1076 },
1077 {
1078 .name = "fat-type",
1079 .type = QEMU_OPT_NUMBER,
1080 .help = "FAT type (12, 16 or 32)",
1081 },
1082 {
1083 .name = "floppy",
1084 .type = QEMU_OPT_BOOL,
1085 .help = "Create a floppy rather than a hard disk image",
1086 },
1087 {
1088 .name = "label",
1089 .type = QEMU_OPT_STRING,
1090 .help = "Use a volume label other than QEMU VVFAT",
1091 },
1092 {
1093 .name = "rw",
1094 .type = QEMU_OPT_BOOL,
1095 .help = "Make the image writable",
1096 },
1097 { }
1098 },
1099};
1100
1101static void vvfat_parse_filename(const char *filename, QDict *options,
1102 Error **errp)
1103{
1104 int fat_type = 0;
1105 bool floppy = false;
1106 bool rw = false;
1107 int i;
1108
1109 if (!strstart(filename, "fat:", NULL)) {
1110 error_setg(errp, "File name string must start with 'fat:'");
1111 return;
1112 }
1113
1114
1115 if (strstr(filename, ":32:")) {
1116 fat_type = 32;
1117 } else if (strstr(filename, ":16:")) {
1118 fat_type = 16;
1119 } else if (strstr(filename, ":12:")) {
1120 fat_type = 12;
1121 }
1122
1123 if (strstr(filename, ":floppy:")) {
1124 floppy = true;
1125 }
1126
1127 if (strstr(filename, ":rw:")) {
1128 rw = true;
1129 }
1130
1131
1132 i = strrchr(filename, ':') - filename;
1133 assert(i >= 3);
1134 if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
1135
1136 filename += i - 1;
1137 } else {
1138 filename += i + 1;
1139 }
1140
1141
1142 qdict_put_str(options, "dir", filename);
1143 qdict_put_int(options, "fat-type", fat_type);
1144 qdict_put_bool(options, "floppy", floppy);
1145 qdict_put_bool(options, "rw", rw);
1146}
1147
1148static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
1149 Error **errp)
1150{
1151 BDRVVVFATState *s = bs->opaque;
1152 int cyls, heads, secs;
1153 bool floppy;
1154 const char *dirname, *label;
1155 QemuOpts *opts;
1156 Error *local_err = NULL;
1157 int ret;
1158
1159#ifdef DEBUG
1160 vvv = s;
1161#endif
1162
1163 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1164 qemu_opts_absorb_qdict(opts, options, &local_err);
1165 if (local_err) {
1166 error_propagate(errp, local_err);
1167 ret = -EINVAL;
1168 goto fail;
1169 }
1170
1171 dirname = qemu_opt_get(opts, "dir");
1172 if (!dirname) {
1173 error_setg(errp, "vvfat block driver requires a 'dir' option");
1174 ret = -EINVAL;
1175 goto fail;
1176 }
1177
1178 s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
1179 floppy = qemu_opt_get_bool(opts, "floppy", false);
1180
1181 memset(s->volume_label, ' ', sizeof(s->volume_label));
1182 label = qemu_opt_get(opts, "label");
1183 if (label) {
1184 size_t label_length = strlen(label);
1185 if (label_length > 11) {
1186 error_setg(errp, "vvfat label cannot be longer than 11 bytes");
1187 ret = -EINVAL;
1188 goto fail;
1189 }
1190 memcpy(s->volume_label, label, label_length);
1191 } else {
1192 memcpy(s->volume_label, "QEMU VVFAT", 10);
1193 }
1194
1195 if (floppy) {
1196
1197 if (!s->fat_type) {
1198 s->fat_type = 12;
1199 secs = 36;
1200 s->sectors_per_cluster = 2;
1201 } else {
1202 secs = s->fat_type == 12 ? 18 : 36;
1203 s->sectors_per_cluster = 1;
1204 }
1205 cyls = 80;
1206 heads = 2;
1207 } else {
1208
1209 if (!s->fat_type) {
1210 s->fat_type = 16;
1211 }
1212 s->offset_to_bootsector = 0x3f;
1213 cyls = s->fat_type == 12 ? 64 : 1024;
1214 heads = 16;
1215 secs = 63;
1216 }
1217
1218 switch (s->fat_type) {
1219 case 32:
1220 warn_report("FAT32 has not been tested. You are welcome to do so!");
1221 break;
1222 case 16:
1223 case 12:
1224 break;
1225 default:
1226 error_setg(errp, "Valid FAT types are only 12, 16 and 32");
1227 ret = -EINVAL;
1228 goto fail;
1229 }
1230
1231
1232 s->bs = bs;
1233
1234
1235 s->sectors_per_cluster=0x10;
1236
1237 s->current_cluster=0xffffffff;
1238
1239 s->qcow = NULL;
1240 s->qcow_filename = NULL;
1241 s->fat2 = NULL;
1242 s->downcase_short_names = 1;
1243
1244 DLOG(fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
1245 dirname, cyls, heads, secs));
1246
1247 s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
1248
1249 if (qemu_opt_get_bool(opts, "rw", false)) {
1250 if (!bdrv_is_read_only(bs)) {
1251 ret = enable_write_target(bs, errp);
1252 if (ret < 0) {
1253 goto fail;
1254 }
1255 } else {
1256 ret = -EPERM;
1257 error_setg(errp,
1258 "Unable to set VVFAT to 'rw' when drive is read-only");
1259 goto fail;
1260 }
1261 } else {
1262 ret = bdrv_apply_auto_read_only(bs, NULL, errp);
1263 if (ret < 0) {
1264 goto fail;
1265 }
1266 }
1267
1268 bs->total_sectors = cyls * heads * secs;
1269
1270 if (init_directories(s, dirname, heads, secs, errp)) {
1271 ret = -EIO;
1272 goto fail;
1273 }
1274
1275 s->sector_count = s->offset_to_root_dir
1276 + s->sectors_per_cluster * s->cluster_count;
1277
1278
1279 if (s->qcow) {
1280 error_setg(&s->migration_blocker,
1281 "The vvfat (rw) format used by node '%s' "
1282 "does not support live migration",
1283 bdrv_get_device_or_node_name(bs));
1284 ret = migrate_add_blocker(s->migration_blocker, &local_err);
1285 if (local_err) {
1286 error_propagate(errp, local_err);
1287 error_free(s->migration_blocker);
1288 goto fail;
1289 }
1290 }
1291
1292 if (s->offset_to_bootsector > 0) {
1293 init_mbr(s, cyls, heads, secs);
1294 }
1295
1296 qemu_co_mutex_init(&s->lock);
1297
1298 ret = 0;
1299fail:
1300 qemu_opts_del(opts);
1301 return ret;
1302}
1303
1304static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
1305{
1306 bs->bl.request_alignment = BDRV_SECTOR_SIZE;
1307}
1308
1309static inline void vvfat_close_current_file(BDRVVVFATState *s)
1310{
1311 if(s->current_mapping) {
1312 s->current_mapping = NULL;
1313 if (s->current_fd) {
1314 qemu_close(s->current_fd);
1315 s->current_fd = 0;
1316 }
1317 }
1318 s->current_cluster = -1;
1319}
1320
1321
1322
1323
1324static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
1325{
1326 while(1) {
1327 int index3;
1328 mapping_t* mapping;
1329 index3=(index1+index2)/2;
1330 mapping=array_get(&(s->mapping),index3);
1331 assert(mapping->begin < mapping->end);
1332 if(mapping->begin>=cluster_num) {
1333 assert(index2!=index3 || index2==0);
1334 if(index2==index3)
1335 return index1;
1336 index2=index3;
1337 } else {
1338 if(index1==index3)
1339 return mapping->end<=cluster_num ? index2 : index1;
1340 index1=index3;
1341 }
1342 assert(index1<=index2);
1343 DLOG(mapping=array_get(&(s->mapping),index1);
1344 assert(mapping->begin<=cluster_num);
1345 assert(index2 >= s->mapping.next ||
1346 ((mapping = array_get(&(s->mapping),index2)) &&
1347 mapping->end>cluster_num)));
1348 }
1349}
1350
1351static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
1352{
1353 int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
1354 mapping_t* mapping;
1355 if(index>=s->mapping.next)
1356 return NULL;
1357 mapping=array_get(&(s->mapping),index);
1358 if(mapping->begin>cluster_num)
1359 return NULL;
1360 assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
1361 return mapping;
1362}
1363
1364static int open_file(BDRVVVFATState* s,mapping_t* mapping)
1365{
1366 if(!mapping)
1367 return -1;
1368 if(!s->current_mapping ||
1369 strcmp(s->current_mapping->path,mapping->path)) {
1370
1371 int fd = qemu_open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
1372 if(fd<0)
1373 return -1;
1374 vvfat_close_current_file(s);
1375 s->current_fd = fd;
1376 s->current_mapping = mapping;
1377 }
1378 return 0;
1379}
1380
1381static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
1382{
1383 if(s->current_cluster != cluster_num) {
1384 int result=0;
1385 off_t offset;
1386 assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
1387 if(!s->current_mapping
1388 || s->current_mapping->begin>cluster_num
1389 || s->current_mapping->end<=cluster_num) {
1390
1391 mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
1392
1393 assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
1394
1395 if (mapping && mapping->mode & MODE_DIRECTORY) {
1396 vvfat_close_current_file(s);
1397 s->current_mapping = mapping;
1398read_cluster_directory:
1399 offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
1400 s->cluster = (unsigned char*)s->directory.pointer+offset
1401 + 0x20*s->current_mapping->info.dir.first_dir_index;
1402 assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
1403 assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
1404 s->current_cluster = cluster_num;
1405 return 0;
1406 }
1407
1408 if(open_file(s,mapping))
1409 return -2;
1410 } else if (s->current_mapping->mode & MODE_DIRECTORY)
1411 goto read_cluster_directory;
1412
1413 assert(s->current_fd);
1414
1415 offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
1416 if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
1417 return -3;
1418 s->cluster=s->cluster_buffer;
1419 result=read(s->current_fd,s->cluster,s->cluster_size);
1420 if(result<0) {
1421 s->current_cluster = -1;
1422 return -1;
1423 }
1424 s->current_cluster = cluster_num;
1425 }
1426 return 0;
1427}
1428
1429#ifdef DEBUG
1430static void print_direntry(const direntry_t* direntry)
1431{
1432 int j = 0;
1433 char buffer[1024];
1434
1435 fprintf(stderr, "direntry %p: ", direntry);
1436 if(!direntry)
1437 return;
1438 if(is_long_name(direntry)) {
1439 unsigned char* c=(unsigned char*)direntry;
1440 int i;
1441 for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
1442#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;}
1443 ADD_CHAR(c[i]);
1444 for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
1445 ADD_CHAR(c[i]);
1446 for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
1447 ADD_CHAR(c[i]);
1448 buffer[j] = 0;
1449 fprintf(stderr, "%s\n", buffer);
1450 } else {
1451 int i;
1452 for(i=0;i<11;i++)
1453 ADD_CHAR(direntry->name[i]);
1454 buffer[j] = 0;
1455 fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
1456 buffer,
1457 direntry->attributes,
1458 begin_of_direntry(direntry),le32_to_cpu(direntry->size));
1459 }
1460}
1461
1462static void print_mapping(const mapping_t* mapping)
1463{
1464 fprintf(stderr, "mapping (%p): begin, end = %d, %d, dir_index = %d, "
1465 "first_mapping_index = %d, name = %s, mode = 0x%x, " ,
1466 mapping, mapping->begin, mapping->end, mapping->dir_index,
1467 mapping->first_mapping_index, mapping->path, mapping->mode);
1468
1469 if (mapping->mode & MODE_DIRECTORY)
1470 fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
1471 else
1472 fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
1473}
1474#endif
1475
1476static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
1477 uint8_t *buf, int nb_sectors)
1478{
1479 BDRVVVFATState *s = bs->opaque;
1480 int i;
1481
1482 for(i=0;i<nb_sectors;i++,sector_num++) {
1483 if (sector_num >= bs->total_sectors)
1484 return -1;
1485 if (s->qcow) {
1486 int64_t n;
1487 int ret;
1488 ret = bdrv_is_allocated(s->qcow->bs, sector_num * BDRV_SECTOR_SIZE,
1489 (nb_sectors - i) * BDRV_SECTOR_SIZE, &n);
1490 if (ret < 0) {
1491 return ret;
1492 }
1493 if (ret) {
1494 DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
1495 " allocated\n", sector_num,
1496 n >> BDRV_SECTOR_BITS));
1497 if (bdrv_read(s->qcow, sector_num, buf + i * 0x200,
1498 n >> BDRV_SECTOR_BITS)) {
1499 return -1;
1500 }
1501 i += (n >> BDRV_SECTOR_BITS) - 1;
1502 sector_num += (n >> BDRV_SECTOR_BITS) - 1;
1503 continue;
1504 }
1505 DLOG(fprintf(stderr, "sector %" PRId64 " not allocated\n",
1506 sector_num));
1507 }
1508 if (sector_num < s->offset_to_root_dir) {
1509 if (sector_num < s->offset_to_fat) {
1510 memcpy(buf + i * 0x200,
1511 &(s->first_sectors[sector_num * 0x200]),
1512 0x200);
1513 } else if (sector_num < s->offset_to_fat + s->sectors_per_fat) {
1514 memcpy(buf + i * 0x200,
1515 &(s->fat.pointer[(sector_num
1516 - s->offset_to_fat) * 0x200]),
1517 0x200);
1518 } else if (sector_num < s->offset_to_root_dir) {
1519 memcpy(buf + i * 0x200,
1520 &(s->fat.pointer[(sector_num - s->offset_to_fat
1521 - s->sectors_per_fat) * 0x200]),
1522 0x200);
1523 }
1524 } else {
1525 uint32_t sector = sector_num - s->offset_to_root_dir,
1526 sector_offset_in_cluster=(sector%s->sectors_per_cluster),
1527 cluster_num=sector/s->sectors_per_cluster;
1528 if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
1529
1530 memset(buf+i*0x200,0,0x200);
1531 continue;
1532 }
1533 memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
1534 }
1535 }
1536 return 0;
1537}
1538
1539static int coroutine_fn
1540vvfat_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
1541 QEMUIOVector *qiov, int flags)
1542{
1543 int ret;
1544 BDRVVVFATState *s = bs->opaque;
1545 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
1546 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
1547 void *buf;
1548
1549 assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
1550 assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
1551
1552 buf = g_try_malloc(bytes);
1553 if (bytes && buf == NULL) {
1554 return -ENOMEM;
1555 }
1556
1557 qemu_co_mutex_lock(&s->lock);
1558 ret = vvfat_read(bs, sector_num, buf, nb_sectors);
1559 qemu_co_mutex_unlock(&s->lock);
1560
1561 qemu_iovec_from_buf(qiov, 0, buf, bytes);
1562 g_free(buf);
1563
1564 return ret;
1565}
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589typedef struct commit_t {
1590 char* path;
1591 union {
1592 struct { uint32_t cluster; } rename;
1593 struct { int dir_index; uint32_t modified_offset; } writeout;
1594 struct { uint32_t first_cluster; } new_file;
1595 struct { uint32_t cluster; } mkdir;
1596 } param;
1597
1598 enum {
1599 ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
1600 } action;
1601} commit_t;
1602
1603static void clear_commits(BDRVVVFATState* s)
1604{
1605 int i;
1606DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
1607 for (i = 0; i < s->commits.next; i++) {
1608 commit_t* commit = array_get(&(s->commits), i);
1609 assert(commit->path || commit->action == ACTION_WRITEOUT);
1610 if (commit->action != ACTION_WRITEOUT) {
1611 assert(commit->path);
1612 g_free(commit->path);
1613 } else
1614 assert(commit->path == NULL);
1615 }
1616 s->commits.next = 0;
1617}
1618
1619static void schedule_rename(BDRVVVFATState* s,
1620 uint32_t cluster, char* new_path)
1621{
1622 commit_t* commit = array_get_next(&(s->commits));
1623 commit->path = new_path;
1624 commit->param.rename.cluster = cluster;
1625 commit->action = ACTION_RENAME;
1626}
1627
1628static void schedule_writeout(BDRVVVFATState* s,
1629 int dir_index, uint32_t modified_offset)
1630{
1631 commit_t* commit = array_get_next(&(s->commits));
1632 commit->path = NULL;
1633 commit->param.writeout.dir_index = dir_index;
1634 commit->param.writeout.modified_offset = modified_offset;
1635 commit->action = ACTION_WRITEOUT;
1636}
1637
1638static void schedule_new_file(BDRVVVFATState* s,
1639 char* path, uint32_t first_cluster)
1640{
1641 commit_t* commit = array_get_next(&(s->commits));
1642 commit->path = path;
1643 commit->param.new_file.first_cluster = first_cluster;
1644 commit->action = ACTION_NEW_FILE;
1645}
1646
1647static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
1648{
1649 commit_t* commit = array_get_next(&(s->commits));
1650 commit->path = path;
1651 commit->param.mkdir.cluster = cluster;
1652 commit->action = ACTION_MKDIR;
1653}
1654
1655typedef struct {
1656
1657
1658
1659
1660
1661 unsigned char name[0x3f * 13 + 1];
1662 gunichar2 name2[0x3f * 13 + 1];
1663 int checksum, len;
1664 int sequence_number;
1665} long_file_name;
1666
1667static void lfn_init(long_file_name* lfn)
1668{
1669 lfn->sequence_number = lfn->len = 0;
1670 lfn->checksum = 0x100;
1671}
1672
1673
1674static int parse_long_name(long_file_name* lfn,
1675 const direntry_t* direntry)
1676{
1677 int i, j, offset;
1678 const unsigned char* pointer = (const unsigned char*)direntry;
1679
1680 if (!is_long_name(direntry))
1681 return 1;
1682
1683 if (pointer[0] & 0x40) {
1684
1685 lfn->sequence_number = pointer[0] & 0x3f;
1686 lfn->checksum = pointer[13];
1687 lfn->name[0] = 0;
1688 lfn->name[lfn->sequence_number * 13] = 0;
1689 } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) {
1690
1691 return -1;
1692 } else if (pointer[13] != lfn->checksum) {
1693
1694 return -2;
1695 } else if (pointer[12] || pointer[26] || pointer[27]) {
1696
1697 return -3;
1698 }
1699
1700 offset = 13 * (lfn->sequence_number - 1);
1701 for (i = 0, j = 1; i < 13; i++, j+=2) {
1702 if (j == 11)
1703 j = 14;
1704 else if (j == 26)
1705 j = 28;
1706
1707 if (pointer[j] == 0 && pointer[j + 1] == 0) {
1708
1709 break;
1710 }
1711 gunichar2 c = (pointer[j + 1] << 8) + pointer[j];
1712 lfn->name2[offset + i] = c;
1713 }
1714
1715 if (pointer[0] & 0x40) {
1716
1717 lfn->len = offset + i;
1718 }
1719 if ((pointer[0] & 0x3f) == 0x01) {
1720
1721 glong olen;
1722 gchar *utf8 = g_utf16_to_utf8(lfn->name2, lfn->len, NULL, &olen, NULL);
1723 if (!utf8) {
1724 return -4;
1725 }
1726 lfn->len = olen;
1727 memcpy(lfn->name, utf8, olen + 1);
1728 g_free(utf8);
1729 }
1730
1731 return 0;
1732}
1733
1734
1735static int parse_short_name(BDRVVVFATState* s,
1736 long_file_name* lfn, direntry_t* direntry)
1737{
1738 int i, j;
1739
1740 if (!is_short_name(direntry))
1741 return 1;
1742
1743 for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
1744 for (i = 0; i <= j; i++) {
1745 uint8_t c = direntry->name[i];
1746 if (c != to_valid_short_char(c)) {
1747 return -1;
1748 } else if (s->downcase_short_names) {
1749 lfn->name[i] = qemu_tolower(direntry->name[i]);
1750 } else {
1751 lfn->name[i] = direntry->name[i];
1752 }
1753 }
1754
1755 for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) {
1756 }
1757 if (j >= 0) {
1758 lfn->name[i++] = '.';
1759 lfn->name[i + j + 1] = '\0';
1760 for (;j >= 0; j--) {
1761 uint8_t c = direntry->name[8 + j];
1762 if (c != to_valid_short_char(c)) {
1763 return -2;
1764 } else if (s->downcase_short_names) {
1765 lfn->name[i + j] = qemu_tolower(c);
1766 } else {
1767 lfn->name[i + j] = c;
1768 }
1769 }
1770 } else
1771 lfn->name[i + j + 1] = '\0';
1772
1773 if (lfn->name[0] == DIR_KANJI_FAKE) {
1774 lfn->name[0] = DIR_KANJI;
1775 }
1776 lfn->len = strlen((char*)lfn->name);
1777
1778 return 0;
1779}
1780
1781static inline uint32_t modified_fat_get(BDRVVVFATState* s,
1782 unsigned int cluster)
1783{
1784 if (cluster < s->last_cluster_of_root_directory) {
1785 if (cluster + 1 == s->last_cluster_of_root_directory)
1786 return s->max_fat_value;
1787 else
1788 return cluster + 1;
1789 }
1790
1791 if (s->fat_type==32) {
1792 uint32_t* entry=((uint32_t*)s->fat2)+cluster;
1793 return le32_to_cpu(*entry);
1794 } else if (s->fat_type==16) {
1795 uint16_t* entry=((uint16_t*)s->fat2)+cluster;
1796 return le16_to_cpu(*entry);
1797 } else {
1798 const uint8_t* x=s->fat2+cluster*3/2;
1799 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
1800 }
1801}
1802
1803static inline bool cluster_was_modified(BDRVVVFATState *s,
1804 uint32_t cluster_num)
1805{
1806 int was_modified = 0;
1807 int i;
1808
1809 if (s->qcow == NULL) {
1810 return 0;
1811 }
1812
1813 for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
1814 was_modified = bdrv_is_allocated(s->qcow->bs,
1815 (cluster2sector(s, cluster_num) +
1816 i) * BDRV_SECTOR_SIZE,
1817 BDRV_SECTOR_SIZE, NULL);
1818 }
1819
1820
1821
1822
1823
1824
1825
1826 return !!was_modified;
1827}
1828
1829static const char* get_basename(const char* path)
1830{
1831 char* basename = strrchr(path, '/');
1832 if (basename == NULL)
1833 return path;
1834 else
1835 return basename + 1;
1836}
1837
1838
1839
1840
1841
1842
1843
1844
1845typedef enum {
1846 USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
1847} used_t;
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
1860 direntry_t* direntry, const char* path)
1861{
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879 int copy_it = 0;
1880 int was_modified = 0;
1881 int32_t ret = 0;
1882
1883 uint32_t cluster_num = begin_of_direntry(direntry);
1884 uint32_t offset = 0;
1885 int first_mapping_index = -1;
1886 mapping_t* mapping = NULL;
1887 const char* basename2 = NULL;
1888
1889 vvfat_close_current_file(s);
1890
1891
1892 if (cluster_num == 0)
1893 return 0;
1894
1895
1896 if (s->qcow) {
1897 basename2 = get_basename(path);
1898
1899 mapping = find_mapping_for_cluster(s, cluster_num);
1900
1901 if (mapping) {
1902 const char* basename;
1903
1904 assert(mapping->mode & MODE_DELETED);
1905 mapping->mode &= ~MODE_DELETED;
1906
1907 basename = get_basename(mapping->path);
1908
1909 assert(mapping->mode & MODE_NORMAL);
1910
1911
1912 if (strcmp(basename, basename2))
1913 schedule_rename(s, cluster_num, g_strdup(path));
1914 } else if (is_file(direntry))
1915
1916 schedule_new_file(s, g_strdup(path), cluster_num);
1917 else {
1918 abort();
1919 return 0;
1920 }
1921 }
1922
1923 while(1) {
1924 if (s->qcow) {
1925 if (!copy_it && cluster_was_modified(s, cluster_num)) {
1926 if (mapping == NULL ||
1927 mapping->begin > cluster_num ||
1928 mapping->end <= cluster_num)
1929 mapping = find_mapping_for_cluster(s, cluster_num);
1930
1931
1932 if (mapping &&
1933 (mapping->mode & MODE_DIRECTORY) == 0) {
1934
1935
1936 if (offset != mapping->info.file.offset + s->cluster_size
1937 * (cluster_num - mapping->begin)) {
1938
1939 abort();
1940 copy_it = 1;
1941 } else if (offset == 0) {
1942 const char* basename = get_basename(mapping->path);
1943
1944 if (strcmp(basename, basename2))
1945 copy_it = 1;
1946 first_mapping_index = array_index(&(s->mapping), mapping);
1947 }
1948
1949 if (mapping->first_mapping_index != first_mapping_index
1950 && mapping->info.file.offset > 0) {
1951 abort();
1952 copy_it = 1;
1953 }
1954
1955
1956 if (!was_modified && is_file(direntry)) {
1957 was_modified = 1;
1958 schedule_writeout(s, mapping->dir_index, offset);
1959 }
1960 }
1961 }
1962
1963 if (copy_it) {
1964 int i;
1965
1966
1967
1968
1969 int64_t offset = cluster2sector(s, cluster_num);
1970
1971 vvfat_close_current_file(s);
1972 for (i = 0; i < s->sectors_per_cluster; i++) {
1973 int res;
1974
1975 res = bdrv_is_allocated(s->qcow->bs,
1976 (offset + i) * BDRV_SECTOR_SIZE,
1977 BDRV_SECTOR_SIZE, NULL);
1978 if (res < 0) {
1979 return -1;
1980 }
1981 if (!res) {
1982 res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
1983 if (res) {
1984 return -1;
1985 }
1986 res = bdrv_write(s->qcow, offset, s->cluster_buffer, 1);
1987 if (res) {
1988 return -2;
1989 }
1990 }
1991 }
1992 }
1993 }
1994
1995 ret++;
1996 if (s->used_clusters[cluster_num] & USED_ANY)
1997 return 0;
1998 s->used_clusters[cluster_num] = USED_FILE;
1999
2000 cluster_num = modified_fat_get(s, cluster_num);
2001
2002 if (fat_eof(s, cluster_num))
2003 return ret;
2004 else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
2005 return -1;
2006
2007 offset += s->cluster_size;
2008 }
2009}
2010
2011
2012
2013
2014
2015
2016static int check_directory_consistency(BDRVVVFATState *s,
2017 int cluster_num, const char* path)
2018{
2019 int ret = 0;
2020 unsigned char* cluster = g_malloc(s->cluster_size);
2021 direntry_t* direntries = (direntry_t*)cluster;
2022 mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
2023
2024 long_file_name lfn;
2025 int path_len = strlen(path);
2026 char path2[PATH_MAX + 1];
2027
2028 assert(path_len < PATH_MAX);
2029 pstrcpy(path2, sizeof(path2), path);
2030 path2[path_len] = '/';
2031 path2[path_len + 1] = '\0';
2032
2033 if (mapping) {
2034 const char* basename = get_basename(mapping->path);
2035 const char* basename2 = get_basename(path);
2036
2037 assert(mapping->mode & MODE_DIRECTORY);
2038
2039 assert(mapping->mode & MODE_DELETED);
2040 mapping->mode &= ~MODE_DELETED;
2041
2042 if (strcmp(basename, basename2))
2043 schedule_rename(s, cluster_num, g_strdup(path));
2044 } else
2045
2046 schedule_mkdir(s, cluster_num, g_strdup(path));
2047
2048 lfn_init(&lfn);
2049 do {
2050 int i;
2051 int subret = 0;
2052
2053 ret++;
2054
2055 if (s->used_clusters[cluster_num] & USED_ANY) {
2056 fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
2057 goto fail;
2058 }
2059 s->used_clusters[cluster_num] = USED_DIRECTORY;
2060
2061DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
2062 subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
2063 s->sectors_per_cluster);
2064 if (subret) {
2065 fprintf(stderr, "Error fetching direntries\n");
2066 fail:
2067 g_free(cluster);
2068 return 0;
2069 }
2070
2071 for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
2072 int cluster_count = 0;
2073
2074DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
2075 if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
2076 is_free(direntries + i))
2077 continue;
2078
2079 subret = parse_long_name(&lfn, direntries + i);
2080 if (subret < 0) {
2081 fprintf(stderr, "Error in long name\n");
2082 goto fail;
2083 }
2084 if (subret == 0 || is_free(direntries + i))
2085 continue;
2086
2087 if (fat_chksum(direntries+i) != lfn.checksum) {
2088 subret = parse_short_name(s, &lfn, direntries + i);
2089 if (subret < 0) {
2090 fprintf(stderr, "Error in short name (%d)\n", subret);
2091 goto fail;
2092 }
2093 if (subret > 0 || !strcmp((char*)lfn.name, ".")
2094 || !strcmp((char*)lfn.name, ".."))
2095 continue;
2096 }
2097 lfn.checksum = 0x100;
2098
2099 if (path_len + 1 + lfn.len >= PATH_MAX) {
2100 fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
2101 goto fail;
2102 }
2103 pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1,
2104 (char*)lfn.name);
2105
2106 if (is_directory(direntries + i)) {
2107 if (begin_of_direntry(direntries + i) == 0) {
2108 DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
2109 goto fail;
2110 }
2111 cluster_count = check_directory_consistency(s,
2112 begin_of_direntry(direntries + i), path2);
2113 if (cluster_count == 0) {
2114 DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
2115 goto fail;
2116 }
2117 } else if (is_file(direntries + i)) {
2118
2119 cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2);
2120 if (cluster_count !=
2121 DIV_ROUND_UP(le32_to_cpu(direntries[i].size), s->cluster_size)) {
2122 DLOG(fprintf(stderr, "Cluster count mismatch\n"));
2123 goto fail;
2124 }
2125 } else
2126 abort();
2127
2128 ret += cluster_count;
2129 }
2130
2131 cluster_num = modified_fat_get(s, cluster_num);
2132 } while(!fat_eof(s, cluster_num));
2133
2134 g_free(cluster);
2135 return ret;
2136}
2137
2138
2139static int is_consistent(BDRVVVFATState* s)
2140{
2141 int i, check;
2142 int used_clusters_count = 0;
2143
2144DLOG(checkpoint());
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158 if (s->fat2 == NULL) {
2159 int size = 0x200 * s->sectors_per_fat;
2160 s->fat2 = g_malloc(size);
2161 memcpy(s->fat2, s->fat.pointer, size);
2162 }
2163 check = vvfat_read(s->bs,
2164 s->offset_to_fat, s->fat2, s->sectors_per_fat);
2165 if (check) {
2166 fprintf(stderr, "Could not copy fat\n");
2167 return 0;
2168 }
2169 assert (s->used_clusters);
2170 for (i = 0; i < sector2cluster(s, s->sector_count); i++)
2171 s->used_clusters[i] &= ~USED_ANY;
2172
2173 clear_commits(s);
2174
2175
2176
2177 if (s->qcow)
2178 for (i = 0; i < s->mapping.next; i++) {
2179 mapping_t* mapping = array_get(&(s->mapping), i);
2180 if (mapping->first_mapping_index < 0)
2181 mapping->mode |= MODE_DELETED;
2182 }
2183
2184 used_clusters_count = check_directory_consistency(s, 0, s->path);
2185 if (used_clusters_count <= 0) {
2186 DLOG(fprintf(stderr, "problem in directory\n"));
2187 return 0;
2188 }
2189
2190 check = s->last_cluster_of_root_directory;
2191 for (i = check; i < sector2cluster(s, s->sector_count); i++) {
2192 if (modified_fat_get(s, i)) {
2193 if(!s->used_clusters[i]) {
2194 DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
2195 return 0;
2196 }
2197 check++;
2198 }
2199
2200 if (s->used_clusters[i] == USED_ALLOCATED) {
2201
2202 DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
2203 return 0;
2204 }
2205 }
2206
2207 if (check != used_clusters_count)
2208 return 0;
2209
2210 return used_clusters_count;
2211}
2212
2213static inline void adjust_mapping_indices(BDRVVVFATState* s,
2214 int offset, int adjust)
2215{
2216 int i;
2217
2218 for (i = 0; i < s->mapping.next; i++) {
2219 mapping_t* mapping = array_get(&(s->mapping), i);
2220
2221#define ADJUST_MAPPING_INDEX(name) \
2222 if (mapping->name >= offset) \
2223 mapping->name += adjust
2224
2225 ADJUST_MAPPING_INDEX(first_mapping_index);
2226 if (mapping->mode & MODE_DIRECTORY)
2227 ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
2228 }
2229}
2230
2231
2232static mapping_t* insert_mapping(BDRVVVFATState* s,
2233 uint32_t begin, uint32_t end)
2234{
2235
2236
2237
2238
2239
2240
2241
2242 int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
2243 mapping_t* mapping = NULL;
2244 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2245
2246 if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
2247 && mapping->begin < begin) {
2248 mapping->end = begin;
2249 index++;
2250 mapping = array_get(&(s->mapping), index);
2251 }
2252 if (index >= s->mapping.next || mapping->begin > begin) {
2253 mapping = array_insert(&(s->mapping), index, 1);
2254 mapping->path = NULL;
2255 adjust_mapping_indices(s, index, +1);
2256 }
2257
2258 mapping->begin = begin;
2259 mapping->end = end;
2260
2261DLOG(mapping_t* next_mapping;
2262assert(index + 1 >= s->mapping.next ||
2263((next_mapping = array_get(&(s->mapping), index + 1)) &&
2264 next_mapping->begin >= end)));
2265
2266 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2267 s->current_mapping = array_get(&(s->mapping),
2268 s->current_mapping - first_mapping);
2269
2270 return mapping;
2271}
2272
2273static int remove_mapping(BDRVVVFATState* s, int mapping_index)
2274{
2275 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
2276 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2277
2278
2279 if (mapping->first_mapping_index < 0) {
2280 g_free(mapping->path);
2281 }
2282
2283
2284 array_remove(&(s->mapping), mapping_index);
2285
2286
2287 adjust_mapping_indices(s, mapping_index, -1);
2288
2289 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2290 s->current_mapping = array_get(&(s->mapping),
2291 s->current_mapping - first_mapping);
2292
2293 return 0;
2294}
2295
2296static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust)
2297{
2298 int i;
2299 for (i = 0; i < s->mapping.next; i++) {
2300 mapping_t* mapping = array_get(&(s->mapping), i);
2301 if (mapping->dir_index >= offset)
2302 mapping->dir_index += adjust;
2303 if ((mapping->mode & MODE_DIRECTORY) &&
2304 mapping->info.dir.first_dir_index >= offset)
2305 mapping->info.dir.first_dir_index += adjust;
2306 }
2307}
2308
2309static direntry_t* insert_direntries(BDRVVVFATState* s,
2310 int dir_index, int count)
2311{
2312
2313
2314
2315
2316 direntry_t* result = array_insert(&(s->directory), dir_index, count);
2317 if (result == NULL)
2318 return NULL;
2319 adjust_dirindices(s, dir_index, count);
2320 return result;
2321}
2322
2323static int remove_direntries(BDRVVVFATState* s, int dir_index, int count)
2324{
2325 int ret = array_remove_slice(&(s->directory), dir_index, count);
2326 if (ret)
2327 return ret;
2328 adjust_dirindices(s, dir_index, -count);
2329 return 0;
2330}
2331
2332
2333
2334
2335
2336
2337
2338static int commit_mappings(BDRVVVFATState* s,
2339 uint32_t first_cluster, int dir_index)
2340{
2341 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2342 direntry_t* direntry = array_get(&(s->directory), dir_index);
2343 uint32_t cluster = first_cluster;
2344
2345 vvfat_close_current_file(s);
2346
2347 assert(mapping);
2348 assert(mapping->begin == first_cluster);
2349 mapping->first_mapping_index = -1;
2350 mapping->dir_index = dir_index;
2351 mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
2352 MODE_DIRECTORY : MODE_NORMAL;
2353
2354 while (!fat_eof(s, cluster)) {
2355 uint32_t c, c1;
2356
2357 for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1;
2358 c = c1, c1 = modified_fat_get(s, c1));
2359
2360 c++;
2361 if (c > mapping->end) {
2362 int index = array_index(&(s->mapping), mapping);
2363 int i, max_i = s->mapping.next - index;
2364 for (i = 1; i < max_i && mapping[i].begin < c; i++);
2365 while (--i > 0)
2366 remove_mapping(s, index + 1);
2367 }
2368 assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
2369 || mapping[1].begin >= c);
2370 mapping->end = c;
2371
2372 if (!fat_eof(s, c1)) {
2373 int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next);
2374 mapping_t* next_mapping = i >= s->mapping.next ? NULL :
2375 array_get(&(s->mapping), i);
2376
2377 if (next_mapping == NULL || next_mapping->begin > c1) {
2378 int i1 = array_index(&(s->mapping), mapping);
2379
2380 next_mapping = insert_mapping(s, c1, c1+1);
2381
2382 if (c1 < c)
2383 i1++;
2384 mapping = array_get(&(s->mapping), i1);
2385 }
2386
2387 next_mapping->dir_index = mapping->dir_index;
2388 next_mapping->first_mapping_index =
2389 mapping->first_mapping_index < 0 ?
2390 array_index(&(s->mapping), mapping) :
2391 mapping->first_mapping_index;
2392 next_mapping->path = mapping->path;
2393 next_mapping->mode = mapping->mode;
2394 next_mapping->read_only = mapping->read_only;
2395 if (mapping->mode & MODE_DIRECTORY) {
2396 next_mapping->info.dir.parent_mapping_index =
2397 mapping->info.dir.parent_mapping_index;
2398 next_mapping->info.dir.first_dir_index =
2399 mapping->info.dir.first_dir_index +
2400 0x10 * s->sectors_per_cluster *
2401 (mapping->end - mapping->begin);
2402 } else
2403 next_mapping->info.file.offset = mapping->info.file.offset +
2404 mapping->end - mapping->begin;
2405
2406 mapping = next_mapping;
2407 }
2408
2409 cluster = c1;
2410 }
2411
2412 return 0;
2413}
2414
2415static int commit_direntries(BDRVVVFATState* s,
2416 int dir_index, int parent_mapping_index)
2417{
2418 direntry_t* direntry = array_get(&(s->directory), dir_index);
2419 uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
2420 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2421 int factor = 0x10 * s->sectors_per_cluster;
2422 int old_cluster_count, new_cluster_count;
2423 int current_dir_index;
2424 int first_dir_index;
2425 int ret, i;
2426 uint32_t c;
2427
2428 assert(direntry);
2429 assert(mapping);
2430 assert(mapping->begin == first_cluster);
2431 assert(mapping->info.dir.first_dir_index < s->directory.next);
2432 assert(mapping->mode & MODE_DIRECTORY);
2433 assert(dir_index == 0 || is_directory(direntry));
2434
2435 DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n",
2436 mapping->path, parent_mapping_index));
2437
2438 current_dir_index = mapping->info.dir.first_dir_index;
2439 first_dir_index = current_dir_index;
2440 mapping->info.dir.parent_mapping_index = parent_mapping_index;
2441
2442 if (first_cluster == 0) {
2443 old_cluster_count = new_cluster_count =
2444 s->last_cluster_of_root_directory;
2445 } else {
2446 for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2447 c = fat_get(s, c))
2448 old_cluster_count++;
2449
2450 for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2451 c = modified_fat_get(s, c))
2452 new_cluster_count++;
2453 }
2454
2455 if (new_cluster_count > old_cluster_count) {
2456 if (insert_direntries(s,
2457 current_dir_index + factor * old_cluster_count,
2458 factor * (new_cluster_count - old_cluster_count)) == NULL)
2459 return -1;
2460 } else if (new_cluster_count < old_cluster_count)
2461 remove_direntries(s,
2462 current_dir_index + factor * new_cluster_count,
2463 factor * (old_cluster_count - new_cluster_count));
2464
2465 for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
2466 direntry_t *first_direntry;
2467 void* direntry = array_get(&(s->directory), current_dir_index);
2468 int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
2469 s->sectors_per_cluster);
2470 if (ret)
2471 return ret;
2472
2473
2474 first_direntry = (direntry_t*) s->directory.pointer;
2475 assert(!memcmp(first_direntry->name, s->volume_label, 11));
2476
2477 current_dir_index += factor;
2478 }
2479
2480 ret = commit_mappings(s, first_cluster, dir_index);
2481 if (ret)
2482 return ret;
2483
2484
2485 for (i = 0; i < factor * new_cluster_count; i++) {
2486 direntry = array_get(&(s->directory), first_dir_index + i);
2487 if (is_directory(direntry) && !is_dot(direntry)) {
2488 mapping = find_mapping_for_cluster(s, first_cluster);
2489 if (mapping == NULL) {
2490 return -1;
2491 }
2492 assert(mapping->mode & MODE_DIRECTORY);
2493 ret = commit_direntries(s, first_dir_index + i,
2494 array_index(&(s->mapping), mapping));
2495 if (ret)
2496 return ret;
2497 }
2498 }
2499
2500 return 0;
2501}
2502
2503
2504
2505static int commit_one_file(BDRVVVFATState* s,
2506 int dir_index, uint32_t offset)
2507{
2508 direntry_t* direntry = array_get(&(s->directory), dir_index);
2509 uint32_t c = begin_of_direntry(direntry);
2510 uint32_t first_cluster = c;
2511 mapping_t* mapping = find_mapping_for_cluster(s, c);
2512 uint32_t size = filesize_of_direntry(direntry);
2513 char *cluster;
2514 uint32_t i;
2515 int fd = 0;
2516
2517 assert(offset < size);
2518 assert((offset % s->cluster_size) == 0);
2519
2520 if (mapping == NULL) {
2521 return -1;
2522 }
2523
2524 for (i = s->cluster_size; i < offset; i += s->cluster_size)
2525 c = modified_fat_get(s, c);
2526
2527 fd = qemu_open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
2528 if (fd < 0) {
2529 fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
2530 strerror(errno), errno);
2531 return fd;
2532 }
2533 if (offset > 0) {
2534 if (lseek(fd, offset, SEEK_SET) != offset) {
2535 qemu_close(fd);
2536 return -3;
2537 }
2538 }
2539
2540 cluster = g_malloc(s->cluster_size);
2541
2542 while (offset < size) {
2543 uint32_t c1;
2544 int rest_size = (size - offset > s->cluster_size ?
2545 s->cluster_size : size - offset);
2546 int ret;
2547
2548 c1 = modified_fat_get(s, c);
2549
2550 assert((size - offset == 0 && fat_eof(s, c)) ||
2551 (size > offset && c >=2 && !fat_eof(s, c)));
2552
2553 ret = vvfat_read(s->bs, cluster2sector(s, c),
2554 (uint8_t*)cluster, DIV_ROUND_UP(rest_size, 0x200));
2555
2556 if (ret < 0) {
2557 qemu_close(fd);
2558 g_free(cluster);
2559 return ret;
2560 }
2561
2562 if (write(fd, cluster, rest_size) < 0) {
2563 qemu_close(fd);
2564 g_free(cluster);
2565 return -2;
2566 }
2567
2568 offset += rest_size;
2569 c = c1;
2570 }
2571
2572 if (ftruncate(fd, size)) {
2573 perror("ftruncate()");
2574 qemu_close(fd);
2575 g_free(cluster);
2576 return -4;
2577 }
2578 qemu_close(fd);
2579 g_free(cluster);
2580
2581 return commit_mappings(s, first_cluster, dir_index);
2582}
2583
2584#ifdef DEBUG
2585
2586static void check1(BDRVVVFATState* s)
2587{
2588 int i;
2589 for (i = 0; i < s->mapping.next; i++) {
2590 mapping_t* mapping = array_get(&(s->mapping), i);
2591 if (mapping->mode & MODE_DELETED) {
2592 fprintf(stderr, "deleted\n");
2593 continue;
2594 }
2595 assert(mapping->dir_index < s->directory.next);
2596 direntry_t* direntry = array_get(&(s->directory), mapping->dir_index);
2597 assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
2598 if (mapping->mode & MODE_DIRECTORY) {
2599 assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
2600 assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0);
2601 }
2602 }
2603}
2604
2605
2606static void check2(BDRVVVFATState* s)
2607{
2608 int i;
2609 int first_mapping = -1;
2610
2611 for (i = 0; i < s->directory.next; i++) {
2612 direntry_t* direntry = array_get(&(s->directory), i);
2613
2614 if (is_short_name(direntry) && begin_of_direntry(direntry)) {
2615 mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry));
2616 assert(mapping);
2617 assert(mapping->dir_index == i || is_dot(direntry));
2618 assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry));
2619 }
2620
2621 if ((i % (0x10 * s->sectors_per_cluster)) == 0) {
2622
2623 int j, count = 0;
2624
2625 for (j = 0; j < s->mapping.next; j++) {
2626 mapping_t* mapping = array_get(&(s->mapping), j);
2627 if (mapping->mode & MODE_DELETED)
2628 continue;
2629 if (mapping->mode & MODE_DIRECTORY) {
2630 if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) {
2631 assert(++count == 1);
2632 if (mapping->first_mapping_index == -1)
2633 first_mapping = array_index(&(s->mapping), mapping);
2634 else
2635 assert(first_mapping == mapping->first_mapping_index);
2636 if (mapping->info.dir.parent_mapping_index < 0)
2637 assert(j == 0);
2638 else {
2639 mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index);
2640 assert(parent->mode & MODE_DIRECTORY);
2641 assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index);
2642 }
2643 }
2644 }
2645 }
2646 if (count == 0)
2647 first_mapping = -1;
2648 }
2649 }
2650}
2651#endif
2652
2653static int handle_renames_and_mkdirs(BDRVVVFATState* s)
2654{
2655 int i;
2656
2657#ifdef DEBUG
2658 fprintf(stderr, "handle_renames\n");
2659 for (i = 0; i < s->commits.next; i++) {
2660 commit_t* commit = array_get(&(s->commits), i);
2661 fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action);
2662 }
2663#endif
2664
2665 for (i = 0; i < s->commits.next;) {
2666 commit_t* commit = array_get(&(s->commits), i);
2667 if (commit->action == ACTION_RENAME) {
2668 mapping_t* mapping = find_mapping_for_cluster(s,
2669 commit->param.rename.cluster);
2670 char *old_path;
2671
2672 if (mapping == NULL) {
2673 return -1;
2674 }
2675 old_path = mapping->path;
2676 assert(commit->path);
2677 mapping->path = commit->path;
2678 if (rename(old_path, mapping->path))
2679 return -2;
2680
2681 if (mapping->mode & MODE_DIRECTORY) {
2682 int l1 = strlen(mapping->path);
2683 int l2 = strlen(old_path);
2684 int diff = l1 - l2;
2685 direntry_t* direntry = array_get(&(s->directory),
2686 mapping->info.dir.first_dir_index);
2687 uint32_t c = mapping->begin;
2688 int i = 0;
2689
2690
2691 while (!fat_eof(s, c)) {
2692 do {
2693 direntry_t* d = direntry + i;
2694
2695 if (is_file(d) || (is_directory(d) && !is_dot(d))) {
2696 int l;
2697 char *new_path;
2698 mapping_t* m = find_mapping_for_cluster(s,
2699 begin_of_direntry(d));
2700 if (m == NULL) {
2701 return -1;
2702 }
2703 l = strlen(m->path);
2704 new_path = g_malloc(l + diff + 1);
2705
2706 assert(!strncmp(m->path, mapping->path, l2));
2707
2708 pstrcpy(new_path, l + diff + 1, mapping->path);
2709 pstrcpy(new_path + l1, l + diff + 1 - l1,
2710 m->path + l2);
2711
2712 schedule_rename(s, m->begin, new_path);
2713 }
2714 i++;
2715 } while((i % (0x10 * s->sectors_per_cluster)) != 0);
2716 c = fat_get(s, c);
2717 }
2718 }
2719
2720 g_free(old_path);
2721 array_remove(&(s->commits), i);
2722 continue;
2723 } else if (commit->action == ACTION_MKDIR) {
2724 mapping_t* mapping;
2725 int j, parent_path_len;
2726
2727#ifdef __MINGW32__
2728 if (mkdir(commit->path))
2729 return -5;
2730#else
2731 if (mkdir(commit->path, 0755))
2732 return -5;
2733#endif
2734
2735 mapping = insert_mapping(s, commit->param.mkdir.cluster,
2736 commit->param.mkdir.cluster + 1);
2737 if (mapping == NULL)
2738 return -6;
2739
2740 mapping->mode = MODE_DIRECTORY;
2741 mapping->read_only = 0;
2742 mapping->path = commit->path;
2743 j = s->directory.next;
2744 assert(j);
2745 insert_direntries(s, s->directory.next,
2746 0x10 * s->sectors_per_cluster);
2747 mapping->info.dir.first_dir_index = j;
2748
2749 parent_path_len = strlen(commit->path)
2750 - strlen(get_basename(commit->path)) - 1;
2751 for (j = 0; j < s->mapping.next; j++) {
2752 mapping_t* m = array_get(&(s->mapping), j);
2753 if (m->first_mapping_index < 0 && m != mapping &&
2754 !strncmp(m->path, mapping->path, parent_path_len) &&
2755 strlen(m->path) == parent_path_len)
2756 break;
2757 }
2758 assert(j < s->mapping.next);
2759 mapping->info.dir.parent_mapping_index = j;
2760
2761 array_remove(&(s->commits), i);
2762 continue;
2763 }
2764
2765 i++;
2766 }
2767 return 0;
2768}
2769
2770
2771
2772
2773static int handle_commits(BDRVVVFATState* s)
2774{
2775 int i, fail = 0;
2776
2777 vvfat_close_current_file(s);
2778
2779 for (i = 0; !fail && i < s->commits.next; i++) {
2780 commit_t* commit = array_get(&(s->commits), i);
2781 switch(commit->action) {
2782 case ACTION_RENAME: case ACTION_MKDIR:
2783 abort();
2784 fail = -2;
2785 break;
2786 case ACTION_WRITEOUT: {
2787#ifndef NDEBUG
2788
2789 direntry_t* entry = array_get(&(s->directory),
2790 commit->param.writeout.dir_index);
2791 uint32_t begin = begin_of_direntry(entry);
2792 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2793#endif
2794
2795 assert(mapping);
2796 assert(mapping->begin == begin);
2797 assert(commit->path == NULL);
2798
2799 if (commit_one_file(s, commit->param.writeout.dir_index,
2800 commit->param.writeout.modified_offset))
2801 fail = -3;
2802
2803 break;
2804 }
2805 case ACTION_NEW_FILE: {
2806 int begin = commit->param.new_file.first_cluster;
2807 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2808 direntry_t* entry;
2809 int i;
2810
2811
2812 for (i = 0; i < s->directory.next; i++) {
2813 entry = array_get(&(s->directory), i);
2814 if (is_file(entry) && begin_of_direntry(entry) == begin)
2815 break;
2816 }
2817
2818 if (i >= s->directory.next) {
2819 fail = -6;
2820 continue;
2821 }
2822
2823
2824 if (mapping && mapping->begin != begin) {
2825 mapping->end = begin;
2826 mapping = NULL;
2827 }
2828 if (mapping == NULL) {
2829 mapping = insert_mapping(s, begin, begin+1);
2830 }
2831
2832 assert(commit->path);
2833 mapping->path = commit->path;
2834 mapping->read_only = 0;
2835 mapping->mode = MODE_NORMAL;
2836 mapping->info.file.offset = 0;
2837
2838 if (commit_one_file(s, i, 0))
2839 fail = -7;
2840
2841 break;
2842 }
2843 default:
2844 abort();
2845 }
2846 }
2847 if (i > 0 && array_remove_slice(&(s->commits), 0, i))
2848 return -1;
2849 return fail;
2850}
2851
2852static int handle_deletes(BDRVVVFATState* s)
2853{
2854 int i, deferred = 1, deleted = 1;
2855
2856
2857
2858 while (deferred && deleted) {
2859 deferred = 0;
2860 deleted = 0;
2861
2862 for (i = 1; i < s->mapping.next; i++) {
2863 mapping_t* mapping = array_get(&(s->mapping), i);
2864 if (mapping->mode & MODE_DELETED) {
2865 direntry_t* entry = array_get(&(s->directory),
2866 mapping->dir_index);
2867
2868 if (is_free(entry)) {
2869
2870 if (mapping->mode & MODE_DIRECTORY) {
2871 int j, next_dir_index = s->directory.next,
2872 first_dir_index = mapping->info.dir.first_dir_index;
2873
2874 if (rmdir(mapping->path) < 0) {
2875 if (errno == ENOTEMPTY) {
2876 deferred++;
2877 continue;
2878 } else
2879 return -5;
2880 }
2881
2882 for (j = 1; j < s->mapping.next; j++) {
2883 mapping_t* m = array_get(&(s->mapping), j);
2884 if (m->mode & MODE_DIRECTORY &&
2885 m->info.dir.first_dir_index >
2886 first_dir_index &&
2887 m->info.dir.first_dir_index <
2888 next_dir_index)
2889 next_dir_index =
2890 m->info.dir.first_dir_index;
2891 }
2892 remove_direntries(s, first_dir_index,
2893 next_dir_index - first_dir_index);
2894
2895 deleted++;
2896 }
2897 } else {
2898 if (unlink(mapping->path))
2899 return -4;
2900 deleted++;
2901 }
2902 DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
2903 remove_mapping(s, i);
2904 }
2905 }
2906 }
2907
2908 return 0;
2909}
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919static int do_commit(BDRVVVFATState* s)
2920{
2921 int ret = 0;
2922
2923
2924 if (s->commits.next == 0)
2925 return 0;
2926
2927 vvfat_close_current_file(s);
2928
2929 ret = handle_renames_and_mkdirs(s);
2930 if (ret) {
2931 fprintf(stderr, "Error handling renames (%d)\n", ret);
2932 abort();
2933 return ret;
2934 }
2935
2936
2937 memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
2938
2939
2940 ret = commit_direntries(s, 0, -1);
2941 if (ret) {
2942 fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
2943 abort();
2944 return ret;
2945 }
2946
2947 ret = handle_commits(s);
2948 if (ret) {
2949 fprintf(stderr, "Error handling commits (%d)\n", ret);
2950 abort();
2951 return ret;
2952 }
2953
2954 ret = handle_deletes(s);
2955 if (ret) {
2956 fprintf(stderr, "Error deleting\n");
2957 abort();
2958 return ret;
2959 }
2960
2961 if (s->qcow->bs->drv && s->qcow->bs->drv->bdrv_make_empty) {
2962 s->qcow->bs->drv->bdrv_make_empty(s->qcow->bs);
2963 }
2964
2965 memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
2966
2967DLOG(checkpoint());
2968 return 0;
2969}
2970
2971static int try_commit(BDRVVVFATState* s)
2972{
2973 vvfat_close_current_file(s);
2974DLOG(checkpoint());
2975 if(!is_consistent(s))
2976 return -1;
2977 return do_commit(s);
2978}
2979
2980static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
2981 const uint8_t *buf, int nb_sectors)
2982{
2983 BDRVVVFATState *s = bs->opaque;
2984 int i, ret;
2985
2986DLOG(checkpoint());
2987
2988
2989 if (s->qcow == NULL) {
2990 return -EACCES;
2991 }
2992
2993 vvfat_close_current_file(s);
2994
2995
2996
2997
2998
2999
3000 if (sector_num < s->offset_to_fat)
3001 return -1;
3002
3003 for (i = sector2cluster(s, sector_num);
3004 i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
3005 mapping_t* mapping = find_mapping_for_cluster(s, i);
3006 if (mapping) {
3007 if (mapping->read_only) {
3008 fprintf(stderr, "Tried to write to write-protected file %s\n",
3009 mapping->path);
3010 return -1;
3011 }
3012
3013 if (mapping->mode & MODE_DIRECTORY) {
3014 int begin = cluster2sector(s, i);
3015 int end = begin + s->sectors_per_cluster, k;
3016 int dir_index;
3017 const direntry_t* direntries;
3018 long_file_name lfn;
3019
3020 lfn_init(&lfn);
3021
3022 if (begin < sector_num)
3023 begin = sector_num;
3024 if (end > sector_num + nb_sectors)
3025 end = sector_num + nb_sectors;
3026 dir_index = mapping->dir_index +
3027 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
3028 direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
3029
3030 for (k = 0; k < (end - begin) * 0x10; k++) {
3031
3032 if (is_short_name(direntries + k) &&
3033 (direntries[k].attributes & 1)) {
3034 if (memcmp(direntries + k,
3035 array_get(&(s->directory), dir_index + k),
3036 sizeof(direntry_t))) {
3037 warn_report("tried to write to write-protected "
3038 "file");
3039 return -1;
3040 }
3041 }
3042 }
3043 }
3044 i = mapping->end;
3045 } else
3046 i++;
3047 }
3048
3049
3050
3051
3052DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
3053 ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
3054 if (ret < 0) {
3055 fprintf(stderr, "Error writing to qcow backend\n");
3056 return ret;
3057 }
3058
3059 for (i = sector2cluster(s, sector_num);
3060 i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
3061 if (i >= 0)
3062 s->used_clusters[i] |= USED_ALLOCATED;
3063
3064DLOG(checkpoint());
3065
3066 try_commit(s);
3067
3068DLOG(checkpoint());
3069 return 0;
3070}
3071
3072static int coroutine_fn
3073vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
3074 QEMUIOVector *qiov, int flags)
3075{
3076 int ret;
3077 BDRVVVFATState *s = bs->opaque;
3078 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
3079 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
3080 void *buf;
3081
3082 assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
3083 assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
3084
3085 buf = g_try_malloc(bytes);
3086 if (bytes && buf == NULL) {
3087 return -ENOMEM;
3088 }
3089 qemu_iovec_to_buf(qiov, 0, buf, bytes);
3090
3091 qemu_co_mutex_lock(&s->lock);
3092 ret = vvfat_write(bs, sector_num, buf, nb_sectors);
3093 qemu_co_mutex_unlock(&s->lock);
3094
3095 g_free(buf);
3096
3097 return ret;
3098}
3099
3100static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs,
3101 bool want_zero, int64_t offset,
3102 int64_t bytes, int64_t *n,
3103 int64_t *map,
3104 BlockDriverState **file)
3105{
3106 *n = bytes;
3107 return BDRV_BLOCK_DATA;
3108}
3109
3110static int coroutine_fn
3111write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
3112 QEMUIOVector *qiov, int flags)
3113{
3114 int ret;
3115
3116 BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
3117 qemu_co_mutex_lock(&s->lock);
3118 ret = try_commit(s);
3119 qemu_co_mutex_unlock(&s->lock);
3120
3121 return ret;
3122}
3123
3124static void write_target_close(BlockDriverState *bs) {
3125 BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
3126 bdrv_unref_child(s->bs, s->qcow);
3127 g_free(s->qcow_filename);
3128}
3129
3130static BlockDriver vvfat_write_target = {
3131 .format_name = "vvfat_write_target",
3132 .instance_size = sizeof(void*),
3133 .bdrv_co_pwritev = write_target_commit,
3134 .bdrv_close = write_target_close,
3135};
3136
3137static void vvfat_qcow_options(int *child_flags, QDict *child_options,
3138 int parent_flags, QDict *parent_options)
3139{
3140 qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
3141 qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off");
3142 qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on");
3143}
3144
3145static const BdrvChildRole child_vvfat_qcow = {
3146 .parent_is_bds = true,
3147 .inherit_options = vvfat_qcow_options,
3148};
3149
3150static int enable_write_target(BlockDriverState *bs, Error **errp)
3151{
3152 BDRVVVFATState *s = bs->opaque;
3153 BlockDriver *bdrv_qcow = NULL;
3154 BlockDriverState *backing;
3155 QemuOpts *opts = NULL;
3156 int ret;
3157 int size = sector2cluster(s, s->sector_count);
3158 QDict *options;
3159
3160 s->used_clusters = calloc(size, 1);
3161
3162 array_init(&(s->commits), sizeof(commit_t));
3163
3164 s->qcow_filename = g_malloc(PATH_MAX);
3165 ret = get_tmp_filename(s->qcow_filename, PATH_MAX);
3166 if (ret < 0) {
3167 error_setg_errno(errp, -ret, "can't create temporary file");
3168 goto err;
3169 }
3170
3171 bdrv_qcow = bdrv_find_format("qcow");
3172 if (!bdrv_qcow) {
3173 error_setg(errp, "Failed to locate qcow driver");
3174 ret = -ENOENT;
3175 goto err;
3176 }
3177
3178 opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
3179 qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512,
3180 &error_abort);
3181 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
3182
3183 ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
3184 qemu_opts_del(opts);
3185 if (ret < 0) {
3186 goto err;
3187 }
3188
3189 options = qdict_new();
3190 qdict_put_str(options, "write-target.driver", "qcow");
3191 s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
3192 &child_vvfat_qcow, false, errp);
3193 qobject_unref(options);
3194 if (!s->qcow) {
3195 ret = -EINVAL;
3196 goto err;
3197 }
3198
3199#ifndef _WIN32
3200 unlink(s->qcow_filename);
3201#endif
3202
3203 backing = bdrv_new_open_driver(&vvfat_write_target, NULL, BDRV_O_ALLOW_RDWR,
3204 &error_abort);
3205 *(void**) backing->opaque = s;
3206
3207 bdrv_set_backing_hd(s->bs, backing, &error_abort);
3208 bdrv_unref(backing);
3209
3210 return 0;
3211
3212err:
3213 g_free(s->qcow_filename);
3214 s->qcow_filename = NULL;
3215 return ret;
3216}
3217
3218static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
3219 const BdrvChildRole *role,
3220 BlockReopenQueue *reopen_queue,
3221 uint64_t perm, uint64_t shared,
3222 uint64_t *nperm, uint64_t *nshared)
3223{
3224 BDRVVVFATState *s = bs->opaque;
3225
3226 assert(c == s->qcow || role == &child_backing);
3227
3228 if (c == s->qcow) {
3229
3230 *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
3231 *nshared = BLK_PERM_WRITE_UNCHANGED;
3232 } else {
3233
3234
3235 *nperm = 0;
3236 *nshared = BLK_PERM_ALL;
3237 }
3238}
3239
3240static void vvfat_close(BlockDriverState *bs)
3241{
3242 BDRVVVFATState *s = bs->opaque;
3243
3244 vvfat_close_current_file(s);
3245 array_free(&(s->fat));
3246 array_free(&(s->directory));
3247 array_free(&(s->mapping));
3248 g_free(s->cluster_buffer);
3249
3250 if (s->qcow) {
3251 migrate_del_blocker(s->migration_blocker);
3252 error_free(s->migration_blocker);
3253 }
3254}
3255
3256static const char *const vvfat_strong_runtime_opts[] = {
3257 "dir",
3258 "fat-type",
3259 "floppy",
3260 "label",
3261 "rw",
3262
3263 NULL
3264};
3265
3266static BlockDriver bdrv_vvfat = {
3267 .format_name = "vvfat",
3268 .protocol_name = "fat",
3269 .instance_size = sizeof(BDRVVVFATState),
3270
3271 .bdrv_parse_filename = vvfat_parse_filename,
3272 .bdrv_file_open = vvfat_open,
3273 .bdrv_refresh_limits = vvfat_refresh_limits,
3274 .bdrv_close = vvfat_close,
3275 .bdrv_child_perm = vvfat_child_perm,
3276
3277 .bdrv_co_preadv = vvfat_co_preadv,
3278 .bdrv_co_pwritev = vvfat_co_pwritev,
3279 .bdrv_co_block_status = vvfat_co_block_status,
3280
3281 .strong_runtime_opts = vvfat_strong_runtime_opts,
3282};
3283
3284static void bdrv_vvfat_init(void)
3285{
3286 bdrv_register(&bdrv_vvfat);
3287}
3288
3289block_init(bdrv_vvfat_init);
3290
3291#ifdef DEBUG
3292static void checkpoint(void)
3293{
3294 assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
3295 check1(vvv);
3296 check2(vvv);
3297 assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
3298}
3299#endif
3300