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25#include "qemu/osdep.h"
26#include <dirent.h>
27#include "qapi/error.h"
28#include "block/block_int.h"
29#include "qemu/module.h"
30#include "qemu/bswap.h"
31#include "migration/blocker.h"
32#include "qapi/qmp/qbool.h"
33#include "qapi/qmp/qstring.h"
34#include "qemu/cutils.h"
35
36#ifndef S_IWGRP
37#define S_IWGRP 0
38#endif
39#ifndef S_IWOTH
40#define S_IWOTH 0
41#endif
42
43
44
45
46
47
48
49
50
51
52
53#ifdef DEBUG
54
55#define DLOG(a) a
56
57static void checkpoint(void);
58
59#ifdef __MINGW32__
60void nonono(const char* file, int line, const char* msg) {
61 fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg);
62 exit(-5);
63}
64#undef assert
65#define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0)
66#endif
67
68#else
69
70#define DLOG(a)
71
72#endif
73
74
75
76
77
78#define BOOTSECTOR_OEM_NAME "MSWIN4.1"
79
80#define DIR_DELETED 0xe5
81#define DIR_KANJI DIR_DELETED
82#define DIR_KANJI_FAKE 0x05
83#define DIR_FREE 0x00
84
85
86typedef struct array_t {
87 char* pointer;
88 unsigned int size,next,item_size;
89} array_t;
90
91static inline void array_init(array_t* array,unsigned int item_size)
92{
93 array->pointer = NULL;
94 array->size=0;
95 array->next=0;
96 array->item_size=item_size;
97}
98
99static inline void array_free(array_t* array)
100{
101 g_free(array->pointer);
102 array->size=array->next=0;
103}
104
105
106static inline void* array_get(array_t* array,unsigned int index) {
107 assert(index < array->next);
108 return array->pointer + index * array->item_size;
109}
110
111static inline int array_ensure_allocated(array_t* array, int index)
112{
113 if((index + 1) * array->item_size > array->size) {
114 int new_size = (index + 32) * array->item_size;
115 array->pointer = g_realloc(array->pointer, new_size);
116 if (!array->pointer)
117 return -1;
118 memset(array->pointer + array->size, 0, new_size - array->size);
119 array->size = new_size;
120 array->next = index + 1;
121 }
122
123 return 0;
124}
125
126static inline void* array_get_next(array_t* array) {
127 unsigned int next = array->next;
128
129 if (array_ensure_allocated(array, next) < 0)
130 return NULL;
131
132 array->next = next + 1;
133 return array_get(array, next);
134}
135
136static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
137 if((array->next+count)*array->item_size>array->size) {
138 int increment=count*array->item_size;
139 array->pointer=g_realloc(array->pointer,array->size+increment);
140 if(!array->pointer)
141 return NULL;
142 array->size+=increment;
143 }
144 memmove(array->pointer+(index+count)*array->item_size,
145 array->pointer+index*array->item_size,
146 (array->next-index)*array->item_size);
147 array->next+=count;
148 return array->pointer+index*array->item_size;
149}
150
151
152
153static inline int array_roll(array_t* array,int index_to,int index_from,int count)
154{
155 char* buf;
156 char* from;
157 char* to;
158 int is;
159
160 if(!array ||
161 index_to<0 || index_to>=array->next ||
162 index_from<0 || index_from>=array->next)
163 return -1;
164
165 if(index_to==index_from)
166 return 0;
167
168 is=array->item_size;
169 from=array->pointer+index_from*is;
170 to=array->pointer+index_to*is;
171 buf=g_malloc(is*count);
172 memcpy(buf,from,is*count);
173
174 if(index_to<index_from)
175 memmove(to+is*count,to,from-to);
176 else
177 memmove(from,from+is*count,to-from);
178
179 memcpy(to,buf,is*count);
180
181 g_free(buf);
182
183 return 0;
184}
185
186static inline int array_remove_slice(array_t* array,int index, int count)
187{
188 assert(index >=0);
189 assert(count > 0);
190 assert(index + count <= array->next);
191 if(array_roll(array,array->next-1,index,count))
192 return -1;
193 array->next -= count;
194 return 0;
195}
196
197static int array_remove(array_t* array,int index)
198{
199 return array_remove_slice(array, index, 1);
200}
201
202
203static int array_index(array_t* array, void* pointer)
204{
205 size_t offset = (char*)pointer - array->pointer;
206 assert((offset % array->item_size) == 0);
207 assert(offset/array->item_size < array->next);
208 return offset/array->item_size;
209}
210
211
212
213
214typedef struct bootsector_t {
215 uint8_t jump[3];
216 uint8_t name[8];
217 uint16_t sector_size;
218 uint8_t sectors_per_cluster;
219 uint16_t reserved_sectors;
220 uint8_t number_of_fats;
221 uint16_t root_entries;
222 uint16_t total_sectors16;
223 uint8_t media_type;
224 uint16_t sectors_per_fat;
225 uint16_t sectors_per_track;
226 uint16_t number_of_heads;
227 uint32_t hidden_sectors;
228 uint32_t total_sectors;
229 union {
230 struct {
231 uint8_t drive_number;
232 uint8_t reserved1;
233 uint8_t signature;
234 uint32_t id;
235 uint8_t volume_label[11];
236 uint8_t fat_type[8];
237 uint8_t ignored[0x1c0];
238 } QEMU_PACKED fat16;
239 struct {
240 uint32_t sectors_per_fat;
241 uint16_t flags;
242 uint8_t major,minor;
243 uint32_t first_cluster_of_root_dir;
244 uint16_t info_sector;
245 uint16_t backup_boot_sector;
246 uint8_t reserved[12];
247 uint8_t drive_number;
248 uint8_t reserved1;
249 uint8_t signature;
250 uint32_t id;
251 uint8_t volume_label[11];
252 uint8_t fat_type[8];
253 uint8_t ignored[0x1a4];
254 } QEMU_PACKED fat32;
255 } u;
256 uint8_t magic[2];
257} QEMU_PACKED bootsector_t;
258
259typedef struct {
260 uint8_t head;
261 uint8_t sector;
262 uint8_t cylinder;
263} mbr_chs_t;
264
265typedef struct partition_t {
266 uint8_t attributes;
267 mbr_chs_t start_CHS;
268 uint8_t fs_type;
269 mbr_chs_t end_CHS;
270 uint32_t start_sector_long;
271 uint32_t length_sector_long;
272} QEMU_PACKED partition_t;
273
274typedef struct mbr_t {
275 uint8_t ignored[0x1b8];
276 uint32_t nt_id;
277 uint8_t ignored2[2];
278 partition_t partition[4];
279 uint8_t magic[2];
280} QEMU_PACKED mbr_t;
281
282typedef struct direntry_t {
283 uint8_t name[8 + 3];
284 uint8_t attributes;
285 uint8_t reserved[2];
286 uint16_t ctime;
287 uint16_t cdate;
288 uint16_t adate;
289 uint16_t begin_hi;
290 uint16_t mtime;
291 uint16_t mdate;
292 uint16_t begin;
293 uint32_t size;
294} QEMU_PACKED direntry_t;
295
296
297
298typedef struct mapping_t {
299
300 uint32_t begin,end;
301
302 unsigned int dir_index;
303
304 int first_mapping_index;
305 union {
306
307
308
309
310 struct {
311 uint32_t offset;
312 } file;
313 struct {
314 int parent_mapping_index;
315 int first_dir_index;
316 } dir;
317 } info;
318
319 char* path;
320
321 enum {
322 MODE_UNDEFINED = 0,
323 MODE_NORMAL = 1,
324 MODE_MODIFIED = 2,
325 MODE_DIRECTORY = 4,
326 MODE_DELETED = 8,
327 } mode;
328 int read_only;
329} mapping_t;
330
331#ifdef DEBUG
332static void print_direntry(const struct direntry_t*);
333static void print_mapping(const struct mapping_t* mapping);
334#endif
335
336
337
338typedef struct BDRVVVFATState {
339 CoMutex lock;
340 BlockDriverState* bs;
341 unsigned char first_sectors[0x40*0x200];
342
343 int fat_type;
344 array_t fat,directory,mapping;
345 char volume_label[11];
346
347 uint32_t offset_to_bootsector;
348
349 unsigned int cluster_size;
350 unsigned int sectors_per_cluster;
351 unsigned int sectors_per_fat;
352 uint32_t last_cluster_of_root_directory;
353
354 uint16_t root_entries;
355 uint32_t sector_count;
356 uint32_t cluster_count;
357 uint32_t max_fat_value;
358 uint32_t offset_to_fat;
359 uint32_t offset_to_root_dir;
360
361 int current_fd;
362 mapping_t* current_mapping;
363 unsigned char* cluster;
364 unsigned char* cluster_buffer;
365 unsigned int current_cluster;
366
367
368 char* qcow_filename;
369 BdrvChild* qcow;
370 void* fat2;
371 char* used_clusters;
372 array_t commits;
373 const char* path;
374 int downcase_short_names;
375
376 Error *migration_blocker;
377} BDRVVVFATState;
378
379
380
381
382
383static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs)
384{
385 int head,sector;
386 sector = spos % secs; spos /= secs;
387 head = spos % heads; spos /= heads;
388 if (spos >= cyls) {
389
390
391
392 chs->head = 0xFF;
393 chs->sector = 0xFF;
394 chs->cylinder = 0xFF;
395 return 1;
396 }
397 chs->head = (uint8_t)head;
398 chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
399 chs->cylinder = (uint8_t)spos;
400 return 0;
401}
402
403static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
404{
405
406 mbr_t* real_mbr=(mbr_t*)s->first_sectors;
407 partition_t* partition = &(real_mbr->partition[0]);
408 int lba;
409
410 memset(s->first_sectors,0,512);
411
412
413 real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
414
415 partition->attributes=0x80;
416
417
418 lba = sector2CHS(&partition->start_CHS, s->offset_to_bootsector,
419 cyls, heads, secs);
420 lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
421 cyls, heads, secs);
422
423
424 partition->start_sector_long = cpu_to_le32(s->offset_to_bootsector);
425 partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
426 - s->offset_to_bootsector);
427
428
429
430
431 partition->fs_type = s->fat_type == 12 ? 0x1 :
432 s->fat_type == 16 ? (lba ? 0xe : 0x06) :
433 (lba ? 0xc : 0x0b);
434
435 real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
436}
437
438
439
440static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
441{
442 int number_of_entries, i;
443 glong length;
444 direntry_t *entry;
445
446 gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
447 if (!longname) {
448 fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
449 return NULL;
450 }
451
452 number_of_entries = (length * 2 + 25) / 26;
453
454 for(i=0;i<number_of_entries;i++) {
455 entry=array_get_next(&(s->directory));
456 entry->attributes=0xf;
457 entry->reserved[0]=0;
458 entry->begin=0;
459 entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
460 }
461 for(i=0;i<26*number_of_entries;i++) {
462 int offset=(i%26);
463 if(offset<10) offset=1+offset;
464 else if(offset<22) offset=14+offset-10;
465 else offset=28+offset-22;
466 entry=array_get(&(s->directory),s->directory.next-1-(i/26));
467 if (i >= 2 * length + 2) {
468 entry->name[offset] = 0xff;
469 } else if (i % 2 == 0) {
470 entry->name[offset] = longname[i / 2] & 0xff;
471 } else {
472 entry->name[offset] = longname[i / 2] >> 8;
473 }
474 }
475 g_free(longname);
476 return array_get(&(s->directory),s->directory.next-number_of_entries);
477}
478
479static char is_free(const direntry_t* direntry)
480{
481 return direntry->name[0] == DIR_DELETED || direntry->name[0] == DIR_FREE;
482}
483
484static char is_volume_label(const direntry_t* direntry)
485{
486 return direntry->attributes == 0x28;
487}
488
489static char is_long_name(const direntry_t* direntry)
490{
491 return direntry->attributes == 0xf;
492}
493
494static char is_short_name(const direntry_t* direntry)
495{
496 return !is_volume_label(direntry) && !is_long_name(direntry)
497 && !is_free(direntry);
498}
499
500static char is_directory(const direntry_t* direntry)
501{
502 return direntry->attributes & 0x10 && direntry->name[0] != DIR_DELETED;
503}
504
505static inline char is_dot(const direntry_t* direntry)
506{
507 return is_short_name(direntry) && direntry->name[0] == '.';
508}
509
510static char is_file(const direntry_t* direntry)
511{
512 return is_short_name(direntry) && !is_directory(direntry);
513}
514
515static inline uint32_t begin_of_direntry(const direntry_t* direntry)
516{
517 return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
518}
519
520static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
521{
522 return le32_to_cpu(direntry->size);
523}
524
525static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
526{
527 direntry->begin = cpu_to_le16(begin & 0xffff);
528 direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
529}
530
531static uint8_t to_valid_short_char(gunichar c)
532{
533 c = g_unichar_toupper(c);
534 if ((c >= '0' && c <= '9') ||
535 (c >= 'A' && c <= 'Z') ||
536 strchr("$%'-_@~`!(){}^#&", c) != 0) {
537 return c;
538 } else {
539 return 0;
540 }
541}
542
543static direntry_t *create_short_filename(BDRVVVFATState *s,
544 const char *filename,
545 unsigned int directory_start)
546{
547 int i, j = 0;
548 direntry_t *entry = array_get_next(&(s->directory));
549 const gchar *p, *last_dot = NULL;
550 gunichar c;
551 bool lossy_conversion = false;
552 char tail[8];
553
554 if (!entry) {
555 return NULL;
556 }
557 memset(entry->name, 0x20, sizeof(entry->name));
558
559
560 for (p = filename; ; p = g_utf8_next_char(p)) {
561 c = g_utf8_get_char(p);
562 if (c == '\0') {
563 break;
564 } else if (c == '.') {
565 if (j == 0) {
566
567 lossy_conversion = true;
568 } else {
569 if (last_dot) {
570 lossy_conversion = true;
571 }
572 last_dot = p;
573 }
574 } else if (!last_dot) {
575
576 uint8_t v = to_valid_short_char(c);
577 if (j < 8 && v) {
578 entry->name[j++] = v;
579 } else {
580 lossy_conversion = true;
581 }
582 }
583 }
584
585
586 if (last_dot) {
587 j = 0;
588 for (p = g_utf8_next_char(last_dot); ; p = g_utf8_next_char(p)) {
589 c = g_utf8_get_char(p);
590 if (c == '\0') {
591 break;
592 } else {
593
594 uint8_t v = to_valid_short_char(c);
595 if (j < 3 && v) {
596 entry->name[8 + (j++)] = v;
597 } else {
598 lossy_conversion = true;
599 }
600 }
601 }
602 }
603
604 if (entry->name[0] == DIR_KANJI) {
605 entry->name[0] = DIR_KANJI_FAKE;
606 }
607
608
609 for (j = 0; j < 8; j++) {
610 if (entry->name[j] == ' ') {
611 break;
612 }
613 }
614 for (i = lossy_conversion ? 1 : 0; i < 999999; i++) {
615 direntry_t *entry1;
616 if (i > 0) {
617 int len = snprintf(tail, sizeof(tail), "~%u", (unsigned)i);
618 assert(len <= 7);
619 memcpy(entry->name + MIN(j, 8 - len), tail, len);
620 }
621 for (entry1 = array_get(&(s->directory), directory_start);
622 entry1 < entry; entry1++) {
623 if (!is_long_name(entry1) &&
624 !memcmp(entry1->name, entry->name, 11)) {
625 break;
626 }
627 }
628 if (entry1 == entry) {
629
630 return entry;
631 }
632 }
633 return NULL;
634}
635
636
637
638static inline uint8_t fat_chksum(const direntry_t* entry)
639{
640 uint8_t chksum=0;
641 int i;
642
643 for (i = 0; i < ARRAY_SIZE(entry->name); i++) {
644 chksum = (((chksum & 0xfe) >> 1) |
645 ((chksum & 0x01) ? 0x80 : 0)) + entry->name[i];
646 }
647
648 return chksum;
649}
650
651
652static uint16_t fat_datetime(time_t time,int return_time) {
653 struct tm* t;
654 struct tm t1;
655 t = &t1;
656 localtime_r(&time,t);
657 if(return_time)
658 return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
659 return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
660}
661
662static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
663{
664 if(s->fat_type==32) {
665 uint32_t* entry=array_get(&(s->fat),cluster);
666 *entry=cpu_to_le32(value);
667 } else if(s->fat_type==16) {
668 uint16_t* entry=array_get(&(s->fat),cluster);
669 *entry=cpu_to_le16(value&0xffff);
670 } else {
671 int offset = (cluster*3/2);
672 unsigned char* p = array_get(&(s->fat), offset);
673 switch (cluster&1) {
674 case 0:
675 p[0] = value&0xff;
676 p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
677 break;
678 case 1:
679 p[0] = (p[0]&0xf) | ((value&0xf)<<4);
680 p[1] = (value>>4);
681 break;
682 }
683 }
684}
685
686static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
687{
688 if(s->fat_type==32) {
689 uint32_t* entry=array_get(&(s->fat),cluster);
690 return le32_to_cpu(*entry);
691 } else if(s->fat_type==16) {
692 uint16_t* entry=array_get(&(s->fat),cluster);
693 return le16_to_cpu(*entry);
694 } else {
695 const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
696 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
697 }
698}
699
700static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
701{
702 if(fat_entry>s->max_fat_value-8)
703 return -1;
704 return 0;
705}
706
707static inline void init_fat(BDRVVVFATState* s)
708{
709 if (s->fat_type == 12) {
710 array_init(&(s->fat),1);
711 array_ensure_allocated(&(s->fat),
712 s->sectors_per_fat * 0x200 * 3 / 2 - 1);
713 } else {
714 array_init(&(s->fat),(s->fat_type==32?4:2));
715 array_ensure_allocated(&(s->fat),
716 s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
717 }
718 memset(s->fat.pointer,0,s->fat.size);
719
720 switch(s->fat_type) {
721 case 12: s->max_fat_value=0xfff; break;
722 case 16: s->max_fat_value=0xffff; break;
723 case 32: s->max_fat_value=0x0fffffff; break;
724 default: s->max_fat_value=0;
725 }
726
727}
728
729static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
730 unsigned int directory_start, const char* filename, int is_dot)
731{
732 int long_index = s->directory.next;
733 direntry_t* entry = NULL;
734 direntry_t* entry_long = NULL;
735
736 if(is_dot) {
737 entry=array_get_next(&(s->directory));
738 memset(entry->name, 0x20, sizeof(entry->name));
739 memcpy(entry->name,filename,strlen(filename));
740 return entry;
741 }
742
743 entry_long=create_long_filename(s,filename);
744 entry = create_short_filename(s, filename, directory_start);
745
746
747 if(entry_long) {
748 uint8_t chksum=fat_chksum(entry);
749
750
751 entry_long=array_get(&(s->directory),long_index);
752 while(entry_long<entry && is_long_name(entry_long)) {
753 entry_long->reserved[1]=chksum;
754 entry_long++;
755 }
756 }
757
758 return entry;
759}
760
761
762
763
764static int read_directory(BDRVVVFATState* s, int mapping_index)
765{
766 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
767 direntry_t* direntry;
768 const char* dirname = mapping->path;
769 int first_cluster = mapping->begin;
770 int parent_index = mapping->info.dir.parent_mapping_index;
771 mapping_t* parent_mapping = (mapping_t*)
772 (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL);
773 int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
774
775 DIR* dir=opendir(dirname);
776 struct dirent* entry;
777 int i;
778
779 assert(mapping->mode & MODE_DIRECTORY);
780
781 if(!dir) {
782 mapping->end = mapping->begin;
783 return -1;
784 }
785
786 i = mapping->info.dir.first_dir_index =
787 first_cluster == 0 ? 0 : s->directory.next;
788
789 if (first_cluster != 0) {
790
791 (void)create_short_and_long_name(s, i, ".", 1);
792 (void)create_short_and_long_name(s, i, "..", 1);
793 }
794
795
796 while((entry=readdir(dir))) {
797 unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
798 char* buffer;
799 direntry_t* direntry;
800 struct stat st;
801 int is_dot=!strcmp(entry->d_name,".");
802 int is_dotdot=!strcmp(entry->d_name,"..");
803
804 if (first_cluster == 0 && s->directory.next >= s->root_entries - 1) {
805 fprintf(stderr, "Too many entries in root directory\n");
806 closedir(dir);
807 return -2;
808 }
809
810 if(first_cluster == 0 && (is_dotdot || is_dot))
811 continue;
812
813 buffer = g_malloc(length);
814 snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
815
816 if(stat(buffer,&st)<0) {
817 g_free(buffer);
818 continue;
819 }
820
821
822 if (!is_dot && !is_dotdot) {
823 direntry = create_short_and_long_name(s, i, entry->d_name, 0);
824 } else {
825 direntry = array_get(&(s->directory), is_dot ? i : i + 1);
826 }
827 direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
828 direntry->reserved[0]=direntry->reserved[1]=0;
829 direntry->ctime=fat_datetime(st.st_ctime,1);
830 direntry->cdate=fat_datetime(st.st_ctime,0);
831 direntry->adate=fat_datetime(st.st_atime,0);
832 direntry->begin_hi=0;
833 direntry->mtime=fat_datetime(st.st_mtime,1);
834 direntry->mdate=fat_datetime(st.st_mtime,0);
835 if(is_dotdot)
836 set_begin_of_direntry(direntry, first_cluster_of_parent);
837 else if(is_dot)
838 set_begin_of_direntry(direntry, first_cluster);
839 else
840 direntry->begin=0;
841 if (st.st_size > 0x7fffffff) {
842 fprintf(stderr, "File %s is larger than 2GB\n", buffer);
843 g_free(buffer);
844 closedir(dir);
845 return -2;
846 }
847 direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
848
849
850 if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
851 s->current_mapping = array_get_next(&(s->mapping));
852 s->current_mapping->begin=0;
853 s->current_mapping->end=st.st_size;
854
855
856
857
858 s->current_mapping->dir_index=s->directory.next-1;
859 s->current_mapping->first_mapping_index = -1;
860 if (S_ISDIR(st.st_mode)) {
861 s->current_mapping->mode = MODE_DIRECTORY;
862 s->current_mapping->info.dir.parent_mapping_index =
863 mapping_index;
864 } else {
865 s->current_mapping->mode = MODE_UNDEFINED;
866 s->current_mapping->info.file.offset = 0;
867 }
868 s->current_mapping->path=buffer;
869 s->current_mapping->read_only =
870 (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
871 } else {
872 g_free(buffer);
873 }
874 }
875 closedir(dir);
876
877
878 while(s->directory.next%(0x10*s->sectors_per_cluster)) {
879 direntry_t* direntry=array_get_next(&(s->directory));
880 memset(direntry,0,sizeof(direntry_t));
881 }
882
883 if (s->fat_type != 32 &&
884 mapping_index == 0 &&
885 s->directory.next < s->root_entries) {
886
887 int cur = s->directory.next;
888 array_ensure_allocated(&(s->directory), s->root_entries - 1);
889 s->directory.next = s->root_entries;
890 memset(array_get(&(s->directory), cur), 0,
891 (s->root_entries - cur) * sizeof(direntry_t));
892 }
893
894
895 mapping = array_get(&(s->mapping), mapping_index);
896 first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
897 * 0x20 / s->cluster_size;
898 mapping->end = first_cluster;
899
900 direntry = array_get(&(s->directory), mapping->dir_index);
901 set_begin_of_direntry(direntry, mapping->begin);
902
903 return 0;
904}
905
906static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
907{
908 return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
909}
910
911static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
912{
913 return s->offset_to_root_dir + s->sectors_per_cluster * cluster_num;
914}
915
916static int init_directories(BDRVVVFATState* s,
917 const char *dirname, int heads, int secs,
918 Error **errp)
919{
920 bootsector_t* bootsector;
921 mapping_t* mapping;
922 unsigned int i;
923 unsigned int cluster;
924
925 memset(&(s->first_sectors[0]),0,0x40*0x200);
926
927 s->cluster_size=s->sectors_per_cluster*0x200;
928 s->cluster_buffer=g_malloc(s->cluster_size);
929
930
931
932
933
934
935
936
937 i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
938 s->sectors_per_fat=(s->sector_count+i)/i;
939
940 s->offset_to_fat = s->offset_to_bootsector + 1;
941 s->offset_to_root_dir = s->offset_to_fat + s->sectors_per_fat * 2;
942
943 array_init(&(s->mapping),sizeof(mapping_t));
944 array_init(&(s->directory),sizeof(direntry_t));
945
946
947 {
948 direntry_t* entry=array_get_next(&(s->directory));
949 entry->attributes=0x28;
950 memcpy(entry->name, s->volume_label, sizeof(entry->name));
951 }
952
953
954 init_fat(s);
955
956
957 s->root_entries = 0x02 * 0x10 * s->sectors_per_cluster;
958 s->cluster_count=sector2cluster(s, s->sector_count);
959
960 mapping = array_get_next(&(s->mapping));
961 mapping->begin = 0;
962 mapping->dir_index = 0;
963 mapping->info.dir.parent_mapping_index = -1;
964 mapping->first_mapping_index = -1;
965 mapping->path = g_strdup(dirname);
966 i = strlen(mapping->path);
967 if (i > 0 && mapping->path[i - 1] == '/')
968 mapping->path[i - 1] = '\0';
969 mapping->mode = MODE_DIRECTORY;
970 mapping->read_only = 0;
971 s->path = mapping->path;
972
973 for (i = 0, cluster = 0; i < s->mapping.next; i++) {
974
975
976
977 int fix_fat = (i != 0);
978 mapping = array_get(&(s->mapping), i);
979
980 if (mapping->mode & MODE_DIRECTORY) {
981 mapping->begin = cluster;
982 if(read_directory(s, i)) {
983 error_setg(errp, "Could not read directory %s",
984 mapping->path);
985 return -1;
986 }
987 mapping = array_get(&(s->mapping), i);
988 } else {
989 assert(mapping->mode == MODE_UNDEFINED);
990 mapping->mode=MODE_NORMAL;
991 mapping->begin = cluster;
992 if (mapping->end > 0) {
993 direntry_t* direntry = array_get(&(s->directory),
994 mapping->dir_index);
995
996 mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
997 set_begin_of_direntry(direntry, mapping->begin);
998 } else {
999 mapping->end = cluster + 1;
1000 fix_fat = 0;
1001 }
1002 }
1003
1004 assert(mapping->begin < mapping->end);
1005
1006
1007 cluster = mapping->end;
1008
1009 if(cluster > s->cluster_count) {
1010 error_setg(errp,
1011 "Directory does not fit in FAT%d (capacity %.2f MB)",
1012 s->fat_type, s->sector_count / 2000.0);
1013 return -1;
1014 }
1015
1016
1017 if (fix_fat) {
1018 int j;
1019 for(j = mapping->begin; j < mapping->end - 1; j++)
1020 fat_set(s, j, j+1);
1021 fat_set(s, mapping->end - 1, s->max_fat_value);
1022 }
1023 }
1024
1025 mapping = array_get(&(s->mapping), 0);
1026 s->last_cluster_of_root_directory = mapping->end;
1027
1028
1029 fat_set(s,0,s->max_fat_value);
1030 fat_set(s,1,s->max_fat_value);
1031
1032 s->current_mapping = NULL;
1033
1034 bootsector = (bootsector_t *)(s->first_sectors
1035 + s->offset_to_bootsector * 0x200);
1036 bootsector->jump[0]=0xeb;
1037 bootsector->jump[1]=0x3e;
1038 bootsector->jump[2]=0x90;
1039 memcpy(bootsector->name, BOOTSECTOR_OEM_NAME, 8);
1040 bootsector->sector_size=cpu_to_le16(0x200);
1041 bootsector->sectors_per_cluster=s->sectors_per_cluster;
1042 bootsector->reserved_sectors=cpu_to_le16(1);
1043 bootsector->number_of_fats=0x2;
1044 bootsector->root_entries = cpu_to_le16(s->root_entries);
1045 bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
1046
1047 bootsector->media_type = (s->offset_to_bootsector > 0 ? 0xf8 : 0xf0);
1048 s->fat.pointer[0] = bootsector->media_type;
1049 bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
1050 bootsector->sectors_per_track = cpu_to_le16(secs);
1051 bootsector->number_of_heads = cpu_to_le16(heads);
1052 bootsector->hidden_sectors = cpu_to_le32(s->offset_to_bootsector);
1053 bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
1054
1055
1056
1057 bootsector->u.fat16.drive_number = s->offset_to_bootsector == 0 ? 0 : 0x80;
1058 bootsector->u.fat16.signature=0x29;
1059 bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
1060
1061 memcpy(bootsector->u.fat16.volume_label, s->volume_label,
1062 sizeof(bootsector->u.fat16.volume_label));
1063 memcpy(bootsector->u.fat16.fat_type,
1064 s->fat_type == 12 ? "FAT12 " : "FAT16 ", 8);
1065 bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
1066
1067 return 0;
1068}
1069
1070#ifdef DEBUG
1071static BDRVVVFATState *vvv = NULL;
1072#endif
1073
1074static int enable_write_target(BlockDriverState *bs, Error **errp);
1075static int is_consistent(BDRVVVFATState *s);
1076
1077static QemuOptsList runtime_opts = {
1078 .name = "vvfat",
1079 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1080 .desc = {
1081 {
1082 .name = "dir",
1083 .type = QEMU_OPT_STRING,
1084 .help = "Host directory to map to the vvfat device",
1085 },
1086 {
1087 .name = "fat-type",
1088 .type = QEMU_OPT_NUMBER,
1089 .help = "FAT type (12, 16 or 32)",
1090 },
1091 {
1092 .name = "floppy",
1093 .type = QEMU_OPT_BOOL,
1094 .help = "Create a floppy rather than a hard disk image",
1095 },
1096 {
1097 .name = "label",
1098 .type = QEMU_OPT_STRING,
1099 .help = "Use a volume label other than QEMU VVFAT",
1100 },
1101 {
1102 .name = "rw",
1103 .type = QEMU_OPT_BOOL,
1104 .help = "Make the image writable",
1105 },
1106 { }
1107 },
1108};
1109
1110static void vvfat_parse_filename(const char *filename, QDict *options,
1111 Error **errp)
1112{
1113 int fat_type = 0;
1114 bool floppy = false;
1115 bool rw = false;
1116 int i;
1117
1118 if (!strstart(filename, "fat:", NULL)) {
1119 error_setg(errp, "File name string must start with 'fat:'");
1120 return;
1121 }
1122
1123
1124 if (strstr(filename, ":32:")) {
1125 fat_type = 32;
1126 } else if (strstr(filename, ":16:")) {
1127 fat_type = 16;
1128 } else if (strstr(filename, ":12:")) {
1129 fat_type = 12;
1130 }
1131
1132 if (strstr(filename, ":floppy:")) {
1133 floppy = true;
1134 }
1135
1136 if (strstr(filename, ":rw:")) {
1137 rw = true;
1138 }
1139
1140
1141 i = strrchr(filename, ':') - filename;
1142 assert(i >= 3);
1143 if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
1144
1145 filename += i - 1;
1146 } else {
1147 filename += i + 1;
1148 }
1149
1150
1151 qdict_put_str(options, "dir", filename);
1152 qdict_put_int(options, "fat-type", fat_type);
1153 qdict_put_bool(options, "floppy", floppy);
1154 qdict_put_bool(options, "rw", rw);
1155}
1156
1157static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
1158 Error **errp)
1159{
1160 BDRVVVFATState *s = bs->opaque;
1161 int cyls, heads, secs;
1162 bool floppy;
1163 const char *dirname, *label;
1164 QemuOpts *opts;
1165 Error *local_err = NULL;
1166 int ret;
1167
1168#ifdef DEBUG
1169 vvv = s;
1170#endif
1171
1172 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1173 qemu_opts_absorb_qdict(opts, options, &local_err);
1174 if (local_err) {
1175 error_propagate(errp, local_err);
1176 ret = -EINVAL;
1177 goto fail;
1178 }
1179
1180 dirname = qemu_opt_get(opts, "dir");
1181 if (!dirname) {
1182 error_setg(errp, "vvfat block driver requires a 'dir' option");
1183 ret = -EINVAL;
1184 goto fail;
1185 }
1186
1187 s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
1188 floppy = qemu_opt_get_bool(opts, "floppy", false);
1189
1190 memset(s->volume_label, ' ', sizeof(s->volume_label));
1191 label = qemu_opt_get(opts, "label");
1192 if (label) {
1193 size_t label_length = strlen(label);
1194 if (label_length > 11) {
1195 error_setg(errp, "vvfat label cannot be longer than 11 bytes");
1196 ret = -EINVAL;
1197 goto fail;
1198 }
1199 memcpy(s->volume_label, label, label_length);
1200 } else {
1201 memcpy(s->volume_label, "QEMU VVFAT", 10);
1202 }
1203
1204 if (floppy) {
1205
1206 if (!s->fat_type) {
1207 s->fat_type = 12;
1208 secs = 36;
1209 s->sectors_per_cluster = 2;
1210 } else {
1211 secs = s->fat_type == 12 ? 18 : 36;
1212 s->sectors_per_cluster = 1;
1213 }
1214 cyls = 80;
1215 heads = 2;
1216 } else {
1217
1218 if (!s->fat_type) {
1219 s->fat_type = 16;
1220 }
1221 s->offset_to_bootsector = 0x3f;
1222 cyls = s->fat_type == 12 ? 64 : 1024;
1223 heads = 16;
1224 secs = 63;
1225 }
1226
1227 switch (s->fat_type) {
1228 case 32:
1229 fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. "
1230 "You are welcome to do so!\n");
1231 break;
1232 case 16:
1233 case 12:
1234 break;
1235 default:
1236 error_setg(errp, "Valid FAT types are only 12, 16 and 32");
1237 ret = -EINVAL;
1238 goto fail;
1239 }
1240
1241
1242 s->bs = bs;
1243
1244
1245 s->sectors_per_cluster=0x10;
1246
1247 s->current_cluster=0xffffffff;
1248
1249 s->qcow = NULL;
1250 s->qcow_filename = NULL;
1251 s->fat2 = NULL;
1252 s->downcase_short_names = 1;
1253
1254 fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
1255 dirname, cyls, heads, secs);
1256
1257 s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
1258
1259 if (qemu_opt_get_bool(opts, "rw", false)) {
1260 if (!bdrv_is_read_only(bs)) {
1261 ret = enable_write_target(bs, errp);
1262 if (ret < 0) {
1263 goto fail;
1264 }
1265 } else {
1266 ret = -EPERM;
1267 error_setg(errp,
1268 "Unable to set VVFAT to 'rw' when drive is read-only");
1269 goto fail;
1270 }
1271 } else {
1272
1273 ret = bdrv_set_read_only(bs, true, &local_err);
1274 if (ret < 0) {
1275 error_propagate(errp, local_err);
1276 goto fail;
1277 }
1278 }
1279
1280 bs->total_sectors = cyls * heads * secs;
1281
1282 if (init_directories(s, dirname, heads, secs, errp)) {
1283 ret = -EIO;
1284 goto fail;
1285 }
1286
1287 s->sector_count = s->offset_to_root_dir
1288 + s->sectors_per_cluster * s->cluster_count;
1289
1290
1291 if (s->qcow) {
1292 error_setg(&s->migration_blocker,
1293 "The vvfat (rw) format used by node '%s' "
1294 "does not support live migration",
1295 bdrv_get_device_or_node_name(bs));
1296 ret = migrate_add_blocker(s->migration_blocker, &local_err);
1297 if (local_err) {
1298 error_propagate(errp, local_err);
1299 error_free(s->migration_blocker);
1300 goto fail;
1301 }
1302 }
1303
1304 if (s->offset_to_bootsector > 0) {
1305 init_mbr(s, cyls, heads, secs);
1306 }
1307
1308 qemu_co_mutex_init(&s->lock);
1309
1310 ret = 0;
1311fail:
1312 qemu_opts_del(opts);
1313 return ret;
1314}
1315
1316static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
1317{
1318 bs->bl.request_alignment = BDRV_SECTOR_SIZE;
1319}
1320
1321static inline void vvfat_close_current_file(BDRVVVFATState *s)
1322{
1323 if(s->current_mapping) {
1324 s->current_mapping = NULL;
1325 if (s->current_fd) {
1326 qemu_close(s->current_fd);
1327 s->current_fd = 0;
1328 }
1329 }
1330 s->current_cluster = -1;
1331}
1332
1333
1334
1335
1336static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
1337{
1338 while(1) {
1339 int index3;
1340 mapping_t* mapping;
1341 index3=(index1+index2)/2;
1342 mapping=array_get(&(s->mapping),index3);
1343 assert(mapping->begin < mapping->end);
1344 if(mapping->begin>=cluster_num) {
1345 assert(index2!=index3 || index2==0);
1346 if(index2==index3)
1347 return index1;
1348 index2=index3;
1349 } else {
1350 if(index1==index3)
1351 return mapping->end<=cluster_num ? index2 : index1;
1352 index1=index3;
1353 }
1354 assert(index1<=index2);
1355 DLOG(mapping=array_get(&(s->mapping),index1);
1356 assert(mapping->begin<=cluster_num);
1357 assert(index2 >= s->mapping.next ||
1358 ((mapping = array_get(&(s->mapping),index2)) &&
1359 mapping->end>cluster_num)));
1360 }
1361}
1362
1363static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
1364{
1365 int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
1366 mapping_t* mapping;
1367 if(index>=s->mapping.next)
1368 return NULL;
1369 mapping=array_get(&(s->mapping),index);
1370 if(mapping->begin>cluster_num)
1371 return NULL;
1372 assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
1373 return mapping;
1374}
1375
1376static int open_file(BDRVVVFATState* s,mapping_t* mapping)
1377{
1378 if(!mapping)
1379 return -1;
1380 if(!s->current_mapping ||
1381 strcmp(s->current_mapping->path,mapping->path)) {
1382
1383 int fd = qemu_open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
1384 if(fd<0)
1385 return -1;
1386 vvfat_close_current_file(s);
1387 s->current_fd = fd;
1388 s->current_mapping = mapping;
1389 }
1390 return 0;
1391}
1392
1393static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
1394{
1395 if(s->current_cluster != cluster_num) {
1396 int result=0;
1397 off_t offset;
1398 assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
1399 if(!s->current_mapping
1400 || s->current_mapping->begin>cluster_num
1401 || s->current_mapping->end<=cluster_num) {
1402
1403 mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
1404
1405 assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
1406
1407 if (mapping && mapping->mode & MODE_DIRECTORY) {
1408 vvfat_close_current_file(s);
1409 s->current_mapping = mapping;
1410read_cluster_directory:
1411 offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
1412 s->cluster = (unsigned char*)s->directory.pointer+offset
1413 + 0x20*s->current_mapping->info.dir.first_dir_index;
1414 assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
1415 assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
1416 s->current_cluster = cluster_num;
1417 return 0;
1418 }
1419
1420 if(open_file(s,mapping))
1421 return -2;
1422 } else if (s->current_mapping->mode & MODE_DIRECTORY)
1423 goto read_cluster_directory;
1424
1425 assert(s->current_fd);
1426
1427 offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
1428 if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
1429 return -3;
1430 s->cluster=s->cluster_buffer;
1431 result=read(s->current_fd,s->cluster,s->cluster_size);
1432 if(result<0) {
1433 s->current_cluster = -1;
1434 return -1;
1435 }
1436 s->current_cluster = cluster_num;
1437 }
1438 return 0;
1439}
1440
1441#ifdef DEBUG
1442static void print_direntry(const direntry_t* direntry)
1443{
1444 int j = 0;
1445 char buffer[1024];
1446
1447 fprintf(stderr, "direntry %p: ", direntry);
1448 if(!direntry)
1449 return;
1450 if(is_long_name(direntry)) {
1451 unsigned char* c=(unsigned char*)direntry;
1452 int i;
1453 for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
1454#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;}
1455 ADD_CHAR(c[i]);
1456 for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
1457 ADD_CHAR(c[i]);
1458 for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
1459 ADD_CHAR(c[i]);
1460 buffer[j] = 0;
1461 fprintf(stderr, "%s\n", buffer);
1462 } else {
1463 int i;
1464 for(i=0;i<11;i++)
1465 ADD_CHAR(direntry->name[i]);
1466 buffer[j] = 0;
1467 fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
1468 buffer,
1469 direntry->attributes,
1470 begin_of_direntry(direntry),le32_to_cpu(direntry->size));
1471 }
1472}
1473
1474static void print_mapping(const mapping_t* mapping)
1475{
1476 fprintf(stderr, "mapping (%p): begin, end = %d, %d, dir_index = %d, "
1477 "first_mapping_index = %d, name = %s, mode = 0x%x, " ,
1478 mapping, mapping->begin, mapping->end, mapping->dir_index,
1479 mapping->first_mapping_index, mapping->path, mapping->mode);
1480
1481 if (mapping->mode & MODE_DIRECTORY)
1482 fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
1483 else
1484 fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
1485}
1486#endif
1487
1488static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
1489 uint8_t *buf, int nb_sectors)
1490{
1491 BDRVVVFATState *s = bs->opaque;
1492 int i;
1493
1494 for(i=0;i<nb_sectors;i++,sector_num++) {
1495 if (sector_num >= bs->total_sectors)
1496 return -1;
1497 if (s->qcow) {
1498 int64_t n;
1499 int ret;
1500 ret = bdrv_is_allocated(s->qcow->bs, sector_num * BDRV_SECTOR_SIZE,
1501 (nb_sectors - i) * BDRV_SECTOR_SIZE, &n);
1502 if (ret < 0) {
1503 return ret;
1504 }
1505 if (ret) {
1506 DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
1507 " allocated\n", sector_num,
1508 n >> BDRV_SECTOR_BITS));
1509 if (bdrv_read(s->qcow, sector_num, buf + i * 0x200,
1510 n >> BDRV_SECTOR_BITS)) {
1511 return -1;
1512 }
1513 i += (n >> BDRV_SECTOR_BITS) - 1;
1514 sector_num += (n >> BDRV_SECTOR_BITS) - 1;
1515 continue;
1516 }
1517 DLOG(fprintf(stderr, "sector %" PRId64 " not allocated\n",
1518 sector_num));
1519 }
1520 if (sector_num < s->offset_to_root_dir) {
1521 if (sector_num < s->offset_to_fat) {
1522 memcpy(buf + i * 0x200,
1523 &(s->first_sectors[sector_num * 0x200]),
1524 0x200);
1525 } else if (sector_num < s->offset_to_fat + s->sectors_per_fat) {
1526 memcpy(buf + i * 0x200,
1527 &(s->fat.pointer[(sector_num
1528 - s->offset_to_fat) * 0x200]),
1529 0x200);
1530 } else if (sector_num < s->offset_to_root_dir) {
1531 memcpy(buf + i * 0x200,
1532 &(s->fat.pointer[(sector_num - s->offset_to_fat
1533 - s->sectors_per_fat) * 0x200]),
1534 0x200);
1535 }
1536 } else {
1537 uint32_t sector = sector_num - s->offset_to_root_dir,
1538 sector_offset_in_cluster=(sector%s->sectors_per_cluster),
1539 cluster_num=sector/s->sectors_per_cluster;
1540 if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
1541
1542 memset(buf+i*0x200,0,0x200);
1543 continue;
1544 }
1545 memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
1546 }
1547 }
1548 return 0;
1549}
1550
1551static int coroutine_fn
1552vvfat_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
1553 QEMUIOVector *qiov, int flags)
1554{
1555 int ret;
1556 BDRVVVFATState *s = bs->opaque;
1557 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
1558 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
1559 void *buf;
1560
1561 assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
1562 assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
1563
1564 buf = g_try_malloc(bytes);
1565 if (bytes && buf == NULL) {
1566 return -ENOMEM;
1567 }
1568
1569 qemu_co_mutex_lock(&s->lock);
1570 ret = vvfat_read(bs, sector_num, buf, nb_sectors);
1571 qemu_co_mutex_unlock(&s->lock);
1572
1573 qemu_iovec_from_buf(qiov, 0, buf, bytes);
1574 g_free(buf);
1575
1576 return ret;
1577}
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601typedef struct commit_t {
1602 char* path;
1603 union {
1604 struct { uint32_t cluster; } rename;
1605 struct { int dir_index; uint32_t modified_offset; } writeout;
1606 struct { uint32_t first_cluster; } new_file;
1607 struct { uint32_t cluster; } mkdir;
1608 } param;
1609
1610 enum {
1611 ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
1612 } action;
1613} commit_t;
1614
1615static void clear_commits(BDRVVVFATState* s)
1616{
1617 int i;
1618DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
1619 for (i = 0; i < s->commits.next; i++) {
1620 commit_t* commit = array_get(&(s->commits), i);
1621 assert(commit->path || commit->action == ACTION_WRITEOUT);
1622 if (commit->action != ACTION_WRITEOUT) {
1623 assert(commit->path);
1624 g_free(commit->path);
1625 } else
1626 assert(commit->path == NULL);
1627 }
1628 s->commits.next = 0;
1629}
1630
1631static void schedule_rename(BDRVVVFATState* s,
1632 uint32_t cluster, char* new_path)
1633{
1634 commit_t* commit = array_get_next(&(s->commits));
1635 commit->path = new_path;
1636 commit->param.rename.cluster = cluster;
1637 commit->action = ACTION_RENAME;
1638}
1639
1640static void schedule_writeout(BDRVVVFATState* s,
1641 int dir_index, uint32_t modified_offset)
1642{
1643 commit_t* commit = array_get_next(&(s->commits));
1644 commit->path = NULL;
1645 commit->param.writeout.dir_index = dir_index;
1646 commit->param.writeout.modified_offset = modified_offset;
1647 commit->action = ACTION_WRITEOUT;
1648}
1649
1650static void schedule_new_file(BDRVVVFATState* s,
1651 char* path, uint32_t first_cluster)
1652{
1653 commit_t* commit = array_get_next(&(s->commits));
1654 commit->path = path;
1655 commit->param.new_file.first_cluster = first_cluster;
1656 commit->action = ACTION_NEW_FILE;
1657}
1658
1659static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
1660{
1661 commit_t* commit = array_get_next(&(s->commits));
1662 commit->path = path;
1663 commit->param.mkdir.cluster = cluster;
1664 commit->action = ACTION_MKDIR;
1665}
1666
1667typedef struct {
1668
1669
1670
1671
1672
1673 unsigned char name[0x3f * 13 + 1];
1674 gunichar2 name2[0x3f * 13 + 1];
1675 int checksum, len;
1676 int sequence_number;
1677} long_file_name;
1678
1679static void lfn_init(long_file_name* lfn)
1680{
1681 lfn->sequence_number = lfn->len = 0;
1682 lfn->checksum = 0x100;
1683}
1684
1685
1686static int parse_long_name(long_file_name* lfn,
1687 const direntry_t* direntry)
1688{
1689 int i, j, offset;
1690 const unsigned char* pointer = (const unsigned char*)direntry;
1691
1692 if (!is_long_name(direntry))
1693 return 1;
1694
1695 if (pointer[0] & 0x40) {
1696
1697 lfn->sequence_number = pointer[0] & 0x3f;
1698 lfn->checksum = pointer[13];
1699 lfn->name[0] = 0;
1700 lfn->name[lfn->sequence_number * 13] = 0;
1701 } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) {
1702
1703 return -1;
1704 } else if (pointer[13] != lfn->checksum) {
1705
1706 return -2;
1707 } else if (pointer[12] || pointer[26] || pointer[27]) {
1708
1709 return -3;
1710 }
1711
1712 offset = 13 * (lfn->sequence_number - 1);
1713 for (i = 0, j = 1; i < 13; i++, j+=2) {
1714 if (j == 11)
1715 j = 14;
1716 else if (j == 26)
1717 j = 28;
1718
1719 if (pointer[j] == 0 && pointer[j + 1] == 0) {
1720
1721 break;
1722 }
1723 gunichar2 c = (pointer[j + 1] << 8) + pointer[j];
1724 lfn->name2[offset + i] = c;
1725 }
1726
1727 if (pointer[0] & 0x40) {
1728
1729 lfn->len = offset + i;
1730 }
1731 if ((pointer[0] & 0x3f) == 0x01) {
1732
1733 glong olen;
1734 gchar *utf8 = g_utf16_to_utf8(lfn->name2, lfn->len, NULL, &olen, NULL);
1735 if (!utf8) {
1736 return -4;
1737 }
1738 lfn->len = olen;
1739 memcpy(lfn->name, utf8, olen + 1);
1740 g_free(utf8);
1741 }
1742
1743 return 0;
1744}
1745
1746
1747static int parse_short_name(BDRVVVFATState* s,
1748 long_file_name* lfn, direntry_t* direntry)
1749{
1750 int i, j;
1751
1752 if (!is_short_name(direntry))
1753 return 1;
1754
1755 for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
1756 for (i = 0; i <= j; i++) {
1757 uint8_t c = direntry->name[i];
1758 if (c != to_valid_short_char(c)) {
1759 return -1;
1760 } else if (s->downcase_short_names) {
1761 lfn->name[i] = qemu_tolower(direntry->name[i]);
1762 } else {
1763 lfn->name[i] = direntry->name[i];
1764 }
1765 }
1766
1767 for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) {
1768 }
1769 if (j >= 0) {
1770 lfn->name[i++] = '.';
1771 lfn->name[i + j + 1] = '\0';
1772 for (;j >= 0; j--) {
1773 uint8_t c = direntry->name[8 + j];
1774 if (c != to_valid_short_char(c)) {
1775 return -2;
1776 } else if (s->downcase_short_names) {
1777 lfn->name[i + j] = qemu_tolower(c);
1778 } else {
1779 lfn->name[i + j] = c;
1780 }
1781 }
1782 } else
1783 lfn->name[i + j + 1] = '\0';
1784
1785 if (lfn->name[0] == DIR_KANJI_FAKE) {
1786 lfn->name[0] = DIR_KANJI;
1787 }
1788 lfn->len = strlen((char*)lfn->name);
1789
1790 return 0;
1791}
1792
1793static inline uint32_t modified_fat_get(BDRVVVFATState* s,
1794 unsigned int cluster)
1795{
1796 if (cluster < s->last_cluster_of_root_directory) {
1797 if (cluster + 1 == s->last_cluster_of_root_directory)
1798 return s->max_fat_value;
1799 else
1800 return cluster + 1;
1801 }
1802
1803 if (s->fat_type==32) {
1804 uint32_t* entry=((uint32_t*)s->fat2)+cluster;
1805 return le32_to_cpu(*entry);
1806 } else if (s->fat_type==16) {
1807 uint16_t* entry=((uint16_t*)s->fat2)+cluster;
1808 return le16_to_cpu(*entry);
1809 } else {
1810 const uint8_t* x=s->fat2+cluster*3/2;
1811 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
1812 }
1813}
1814
1815static inline bool cluster_was_modified(BDRVVVFATState *s,
1816 uint32_t cluster_num)
1817{
1818 int was_modified = 0;
1819 int i;
1820
1821 if (s->qcow == NULL) {
1822 return 0;
1823 }
1824
1825 for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
1826 was_modified = bdrv_is_allocated(s->qcow->bs,
1827 (cluster2sector(s, cluster_num) +
1828 i) * BDRV_SECTOR_SIZE,
1829 BDRV_SECTOR_SIZE, NULL);
1830 }
1831
1832
1833
1834
1835
1836
1837
1838 return !!was_modified;
1839}
1840
1841static const char* get_basename(const char* path)
1842{
1843 char* basename = strrchr(path, '/');
1844 if (basename == NULL)
1845 return path;
1846 else
1847 return basename + 1;
1848}
1849
1850
1851
1852
1853
1854
1855
1856
1857typedef enum {
1858 USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
1859} used_t;
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
1872 direntry_t* direntry, const char* path)
1873{
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891 int copy_it = 0;
1892 int was_modified = 0;
1893 int32_t ret = 0;
1894
1895 uint32_t cluster_num = begin_of_direntry(direntry);
1896 uint32_t offset = 0;
1897 int first_mapping_index = -1;
1898 mapping_t* mapping = NULL;
1899 const char* basename2 = NULL;
1900
1901 vvfat_close_current_file(s);
1902
1903
1904 if (cluster_num == 0)
1905 return 0;
1906
1907
1908 if (s->qcow) {
1909 basename2 = get_basename(path);
1910
1911 mapping = find_mapping_for_cluster(s, cluster_num);
1912
1913 if (mapping) {
1914 const char* basename;
1915
1916 assert(mapping->mode & MODE_DELETED);
1917 mapping->mode &= ~MODE_DELETED;
1918
1919 basename = get_basename(mapping->path);
1920
1921 assert(mapping->mode & MODE_NORMAL);
1922
1923
1924 if (strcmp(basename, basename2))
1925 schedule_rename(s, cluster_num, g_strdup(path));
1926 } else if (is_file(direntry))
1927
1928 schedule_new_file(s, g_strdup(path), cluster_num);
1929 else {
1930 abort();
1931 return 0;
1932 }
1933 }
1934
1935 while(1) {
1936 if (s->qcow) {
1937 if (!copy_it && cluster_was_modified(s, cluster_num)) {
1938 if (mapping == NULL ||
1939 mapping->begin > cluster_num ||
1940 mapping->end <= cluster_num)
1941 mapping = find_mapping_for_cluster(s, cluster_num);
1942
1943
1944 if (mapping &&
1945 (mapping->mode & MODE_DIRECTORY) == 0) {
1946
1947
1948 if (offset != mapping->info.file.offset + s->cluster_size
1949 * (cluster_num - mapping->begin)) {
1950
1951 abort();
1952 copy_it = 1;
1953 } else if (offset == 0) {
1954 const char* basename = get_basename(mapping->path);
1955
1956 if (strcmp(basename, basename2))
1957 copy_it = 1;
1958 first_mapping_index = array_index(&(s->mapping), mapping);
1959 }
1960
1961 if (mapping->first_mapping_index != first_mapping_index
1962 && mapping->info.file.offset > 0) {
1963 abort();
1964 copy_it = 1;
1965 }
1966
1967
1968 if (!was_modified && is_file(direntry)) {
1969 was_modified = 1;
1970 schedule_writeout(s, mapping->dir_index, offset);
1971 }
1972 }
1973 }
1974
1975 if (copy_it) {
1976 int i;
1977
1978
1979
1980
1981 int64_t offset = cluster2sector(s, cluster_num);
1982
1983 vvfat_close_current_file(s);
1984 for (i = 0; i < s->sectors_per_cluster; i++) {
1985 int res;
1986
1987 res = bdrv_is_allocated(s->qcow->bs,
1988 (offset + i) * BDRV_SECTOR_SIZE,
1989 BDRV_SECTOR_SIZE, NULL);
1990 if (res < 0) {
1991 return -1;
1992 }
1993 if (!res) {
1994 res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
1995 if (res) {
1996 return -1;
1997 }
1998 res = bdrv_write(s->qcow, offset, s->cluster_buffer, 1);
1999 if (res) {
2000 return -2;
2001 }
2002 }
2003 }
2004 }
2005 }
2006
2007 ret++;
2008 if (s->used_clusters[cluster_num] & USED_ANY)
2009 return 0;
2010 s->used_clusters[cluster_num] = USED_FILE;
2011
2012 cluster_num = modified_fat_get(s, cluster_num);
2013
2014 if (fat_eof(s, cluster_num))
2015 return ret;
2016 else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
2017 return -1;
2018
2019 offset += s->cluster_size;
2020 }
2021}
2022
2023
2024
2025
2026
2027
2028static int check_directory_consistency(BDRVVVFATState *s,
2029 int cluster_num, const char* path)
2030{
2031 int ret = 0;
2032 unsigned char* cluster = g_malloc(s->cluster_size);
2033 direntry_t* direntries = (direntry_t*)cluster;
2034 mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
2035
2036 long_file_name lfn;
2037 int path_len = strlen(path);
2038 char path2[PATH_MAX + 1];
2039
2040 assert(path_len < PATH_MAX);
2041 pstrcpy(path2, sizeof(path2), path);
2042 path2[path_len] = '/';
2043 path2[path_len + 1] = '\0';
2044
2045 if (mapping) {
2046 const char* basename = get_basename(mapping->path);
2047 const char* basename2 = get_basename(path);
2048
2049 assert(mapping->mode & MODE_DIRECTORY);
2050
2051 assert(mapping->mode & MODE_DELETED);
2052 mapping->mode &= ~MODE_DELETED;
2053
2054 if (strcmp(basename, basename2))
2055 schedule_rename(s, cluster_num, g_strdup(path));
2056 } else
2057
2058 schedule_mkdir(s, cluster_num, g_strdup(path));
2059
2060 lfn_init(&lfn);
2061 do {
2062 int i;
2063 int subret = 0;
2064
2065 ret++;
2066
2067 if (s->used_clusters[cluster_num] & USED_ANY) {
2068 fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
2069 goto fail;
2070 }
2071 s->used_clusters[cluster_num] = USED_DIRECTORY;
2072
2073DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
2074 subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
2075 s->sectors_per_cluster);
2076 if (subret) {
2077 fprintf(stderr, "Error fetching direntries\n");
2078 fail:
2079 g_free(cluster);
2080 return 0;
2081 }
2082
2083 for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
2084 int cluster_count = 0;
2085
2086DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
2087 if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
2088 is_free(direntries + i))
2089 continue;
2090
2091 subret = parse_long_name(&lfn, direntries + i);
2092 if (subret < 0) {
2093 fprintf(stderr, "Error in long name\n");
2094 goto fail;
2095 }
2096 if (subret == 0 || is_free(direntries + i))
2097 continue;
2098
2099 if (fat_chksum(direntries+i) != lfn.checksum) {
2100 subret = parse_short_name(s, &lfn, direntries + i);
2101 if (subret < 0) {
2102 fprintf(stderr, "Error in short name (%d)\n", subret);
2103 goto fail;
2104 }
2105 if (subret > 0 || !strcmp((char*)lfn.name, ".")
2106 || !strcmp((char*)lfn.name, ".."))
2107 continue;
2108 }
2109 lfn.checksum = 0x100;
2110
2111 if (path_len + 1 + lfn.len >= PATH_MAX) {
2112 fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
2113 goto fail;
2114 }
2115 pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1,
2116 (char*)lfn.name);
2117
2118 if (is_directory(direntries + i)) {
2119 if (begin_of_direntry(direntries + i) == 0) {
2120 DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
2121 goto fail;
2122 }
2123 cluster_count = check_directory_consistency(s,
2124 begin_of_direntry(direntries + i), path2);
2125 if (cluster_count == 0) {
2126 DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
2127 goto fail;
2128 }
2129 } else if (is_file(direntries + i)) {
2130
2131 cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2);
2132 if (cluster_count !=
2133 DIV_ROUND_UP(le32_to_cpu(direntries[i].size), s->cluster_size)) {
2134 DLOG(fprintf(stderr, "Cluster count mismatch\n"));
2135 goto fail;
2136 }
2137 } else
2138 abort();
2139
2140 ret += cluster_count;
2141 }
2142
2143 cluster_num = modified_fat_get(s, cluster_num);
2144 } while(!fat_eof(s, cluster_num));
2145
2146 g_free(cluster);
2147 return ret;
2148}
2149
2150
2151static int is_consistent(BDRVVVFATState* s)
2152{
2153 int i, check;
2154 int used_clusters_count = 0;
2155
2156DLOG(checkpoint());
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170 if (s->fat2 == NULL) {
2171 int size = 0x200 * s->sectors_per_fat;
2172 s->fat2 = g_malloc(size);
2173 memcpy(s->fat2, s->fat.pointer, size);
2174 }
2175 check = vvfat_read(s->bs,
2176 s->offset_to_fat, s->fat2, s->sectors_per_fat);
2177 if (check) {
2178 fprintf(stderr, "Could not copy fat\n");
2179 return 0;
2180 }
2181 assert (s->used_clusters);
2182 for (i = 0; i < sector2cluster(s, s->sector_count); i++)
2183 s->used_clusters[i] &= ~USED_ANY;
2184
2185 clear_commits(s);
2186
2187
2188
2189 if (s->qcow)
2190 for (i = 0; i < s->mapping.next; i++) {
2191 mapping_t* mapping = array_get(&(s->mapping), i);
2192 if (mapping->first_mapping_index < 0)
2193 mapping->mode |= MODE_DELETED;
2194 }
2195
2196 used_clusters_count = check_directory_consistency(s, 0, s->path);
2197 if (used_clusters_count <= 0) {
2198 DLOG(fprintf(stderr, "problem in directory\n"));
2199 return 0;
2200 }
2201
2202 check = s->last_cluster_of_root_directory;
2203 for (i = check; i < sector2cluster(s, s->sector_count); i++) {
2204 if (modified_fat_get(s, i)) {
2205 if(!s->used_clusters[i]) {
2206 DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
2207 return 0;
2208 }
2209 check++;
2210 }
2211
2212 if (s->used_clusters[i] == USED_ALLOCATED) {
2213
2214 DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
2215 return 0;
2216 }
2217 }
2218
2219 if (check != used_clusters_count)
2220 return 0;
2221
2222 return used_clusters_count;
2223}
2224
2225static inline void adjust_mapping_indices(BDRVVVFATState* s,
2226 int offset, int adjust)
2227{
2228 int i;
2229
2230 for (i = 0; i < s->mapping.next; i++) {
2231 mapping_t* mapping = array_get(&(s->mapping), i);
2232
2233#define ADJUST_MAPPING_INDEX(name) \
2234 if (mapping->name >= offset) \
2235 mapping->name += adjust
2236
2237 ADJUST_MAPPING_INDEX(first_mapping_index);
2238 if (mapping->mode & MODE_DIRECTORY)
2239 ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
2240 }
2241}
2242
2243
2244static mapping_t* insert_mapping(BDRVVVFATState* s,
2245 uint32_t begin, uint32_t end)
2246{
2247
2248
2249
2250
2251
2252
2253
2254 int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
2255 mapping_t* mapping = NULL;
2256 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2257
2258 if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
2259 && mapping->begin < begin) {
2260 mapping->end = begin;
2261 index++;
2262 mapping = array_get(&(s->mapping), index);
2263 }
2264 if (index >= s->mapping.next || mapping->begin > begin) {
2265 mapping = array_insert(&(s->mapping), index, 1);
2266 mapping->path = NULL;
2267 adjust_mapping_indices(s, index, +1);
2268 }
2269
2270 mapping->begin = begin;
2271 mapping->end = end;
2272
2273DLOG(mapping_t* next_mapping;
2274assert(index + 1 >= s->mapping.next ||
2275((next_mapping = array_get(&(s->mapping), index + 1)) &&
2276 next_mapping->begin >= end)));
2277
2278 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2279 s->current_mapping = array_get(&(s->mapping),
2280 s->current_mapping - first_mapping);
2281
2282 return mapping;
2283}
2284
2285static int remove_mapping(BDRVVVFATState* s, int mapping_index)
2286{
2287 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
2288 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2289
2290
2291 if (mapping->first_mapping_index < 0) {
2292 g_free(mapping->path);
2293 }
2294
2295
2296 array_remove(&(s->mapping), mapping_index);
2297
2298
2299 adjust_mapping_indices(s, mapping_index, -1);
2300
2301 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2302 s->current_mapping = array_get(&(s->mapping),
2303 s->current_mapping - first_mapping);
2304
2305 return 0;
2306}
2307
2308static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust)
2309{
2310 int i;
2311 for (i = 0; i < s->mapping.next; i++) {
2312 mapping_t* mapping = array_get(&(s->mapping), i);
2313 if (mapping->dir_index >= offset)
2314 mapping->dir_index += adjust;
2315 if ((mapping->mode & MODE_DIRECTORY) &&
2316 mapping->info.dir.first_dir_index >= offset)
2317 mapping->info.dir.first_dir_index += adjust;
2318 }
2319}
2320
2321static direntry_t* insert_direntries(BDRVVVFATState* s,
2322 int dir_index, int count)
2323{
2324
2325
2326
2327
2328 direntry_t* result = array_insert(&(s->directory), dir_index, count);
2329 if (result == NULL)
2330 return NULL;
2331 adjust_dirindices(s, dir_index, count);
2332 return result;
2333}
2334
2335static int remove_direntries(BDRVVVFATState* s, int dir_index, int count)
2336{
2337 int ret = array_remove_slice(&(s->directory), dir_index, count);
2338 if (ret)
2339 return ret;
2340 adjust_dirindices(s, dir_index, -count);
2341 return 0;
2342}
2343
2344
2345
2346
2347
2348
2349
2350static int commit_mappings(BDRVVVFATState* s,
2351 uint32_t first_cluster, int dir_index)
2352{
2353 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2354 direntry_t* direntry = array_get(&(s->directory), dir_index);
2355 uint32_t cluster = first_cluster;
2356
2357 vvfat_close_current_file(s);
2358
2359 assert(mapping);
2360 assert(mapping->begin == first_cluster);
2361 mapping->first_mapping_index = -1;
2362 mapping->dir_index = dir_index;
2363 mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
2364 MODE_DIRECTORY : MODE_NORMAL;
2365
2366 while (!fat_eof(s, cluster)) {
2367 uint32_t c, c1;
2368
2369 for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1;
2370 c = c1, c1 = modified_fat_get(s, c1));
2371
2372 c++;
2373 if (c > mapping->end) {
2374 int index = array_index(&(s->mapping), mapping);
2375 int i, max_i = s->mapping.next - index;
2376 for (i = 1; i < max_i && mapping[i].begin < c; i++);
2377 while (--i > 0)
2378 remove_mapping(s, index + 1);
2379 }
2380 assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
2381 || mapping[1].begin >= c);
2382 mapping->end = c;
2383
2384 if (!fat_eof(s, c1)) {
2385 int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next);
2386 mapping_t* next_mapping = i >= s->mapping.next ? NULL :
2387 array_get(&(s->mapping), i);
2388
2389 if (next_mapping == NULL || next_mapping->begin > c1) {
2390 int i1 = array_index(&(s->mapping), mapping);
2391
2392 next_mapping = insert_mapping(s, c1, c1+1);
2393
2394 if (c1 < c)
2395 i1++;
2396 mapping = array_get(&(s->mapping), i1);
2397 }
2398
2399 next_mapping->dir_index = mapping->dir_index;
2400 next_mapping->first_mapping_index =
2401 mapping->first_mapping_index < 0 ?
2402 array_index(&(s->mapping), mapping) :
2403 mapping->first_mapping_index;
2404 next_mapping->path = mapping->path;
2405 next_mapping->mode = mapping->mode;
2406 next_mapping->read_only = mapping->read_only;
2407 if (mapping->mode & MODE_DIRECTORY) {
2408 next_mapping->info.dir.parent_mapping_index =
2409 mapping->info.dir.parent_mapping_index;
2410 next_mapping->info.dir.first_dir_index =
2411 mapping->info.dir.first_dir_index +
2412 0x10 * s->sectors_per_cluster *
2413 (mapping->end - mapping->begin);
2414 } else
2415 next_mapping->info.file.offset = mapping->info.file.offset +
2416 mapping->end - mapping->begin;
2417
2418 mapping = next_mapping;
2419 }
2420
2421 cluster = c1;
2422 }
2423
2424 return 0;
2425}
2426
2427static int commit_direntries(BDRVVVFATState* s,
2428 int dir_index, int parent_mapping_index)
2429{
2430 direntry_t* direntry = array_get(&(s->directory), dir_index);
2431 uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
2432 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2433
2434 int factor = 0x10 * s->sectors_per_cluster;
2435 int old_cluster_count, new_cluster_count;
2436 int current_dir_index = mapping->info.dir.first_dir_index;
2437 int first_dir_index = current_dir_index;
2438 int ret, i;
2439 uint32_t c;
2440
2441DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
2442
2443 assert(direntry);
2444 assert(mapping);
2445 assert(mapping->begin == first_cluster);
2446 assert(mapping->info.dir.first_dir_index < s->directory.next);
2447 assert(mapping->mode & MODE_DIRECTORY);
2448 assert(dir_index == 0 || is_directory(direntry));
2449
2450 mapping->info.dir.parent_mapping_index = parent_mapping_index;
2451
2452 if (first_cluster == 0) {
2453 old_cluster_count = new_cluster_count =
2454 s->last_cluster_of_root_directory;
2455 } else {
2456 for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2457 c = fat_get(s, c))
2458 old_cluster_count++;
2459
2460 for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2461 c = modified_fat_get(s, c))
2462 new_cluster_count++;
2463 }
2464
2465 if (new_cluster_count > old_cluster_count) {
2466 if (insert_direntries(s,
2467 current_dir_index + factor * old_cluster_count,
2468 factor * (new_cluster_count - old_cluster_count)) == NULL)
2469 return -1;
2470 } else if (new_cluster_count < old_cluster_count)
2471 remove_direntries(s,
2472 current_dir_index + factor * new_cluster_count,
2473 factor * (old_cluster_count - new_cluster_count));
2474
2475 for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
2476 direntry_t *first_direntry;
2477 void* direntry = array_get(&(s->directory), current_dir_index);
2478 int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
2479 s->sectors_per_cluster);
2480 if (ret)
2481 return ret;
2482
2483
2484 first_direntry = (direntry_t*) s->directory.pointer;
2485 assert(!memcmp(first_direntry->name, s->volume_label, 11));
2486
2487 current_dir_index += factor;
2488 }
2489
2490 ret = commit_mappings(s, first_cluster, dir_index);
2491 if (ret)
2492 return ret;
2493
2494
2495 for (i = 0; i < factor * new_cluster_count; i++) {
2496 direntry = array_get(&(s->directory), first_dir_index + i);
2497 if (is_directory(direntry) && !is_dot(direntry)) {
2498 mapping = find_mapping_for_cluster(s, first_cluster);
2499 assert(mapping->mode & MODE_DIRECTORY);
2500 ret = commit_direntries(s, first_dir_index + i,
2501 array_index(&(s->mapping), mapping));
2502 if (ret)
2503 return ret;
2504 }
2505 }
2506
2507 return 0;
2508}
2509
2510
2511
2512static int commit_one_file(BDRVVVFATState* s,
2513 int dir_index, uint32_t offset)
2514{
2515 direntry_t* direntry = array_get(&(s->directory), dir_index);
2516 uint32_t c = begin_of_direntry(direntry);
2517 uint32_t first_cluster = c;
2518 mapping_t* mapping = find_mapping_for_cluster(s, c);
2519 uint32_t size = filesize_of_direntry(direntry);
2520 char* cluster = g_malloc(s->cluster_size);
2521 uint32_t i;
2522 int fd = 0;
2523
2524 assert(offset < size);
2525 assert((offset % s->cluster_size) == 0);
2526
2527 for (i = s->cluster_size; i < offset; i += s->cluster_size)
2528 c = modified_fat_get(s, c);
2529
2530 fd = qemu_open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
2531 if (fd < 0) {
2532 fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
2533 strerror(errno), errno);
2534 g_free(cluster);
2535 return fd;
2536 }
2537 if (offset > 0) {
2538 if (lseek(fd, offset, SEEK_SET) != offset) {
2539 qemu_close(fd);
2540 g_free(cluster);
2541 return -3;
2542 }
2543 }
2544
2545 while (offset < size) {
2546 uint32_t c1;
2547 int rest_size = (size - offset > s->cluster_size ?
2548 s->cluster_size : size - offset);
2549 int ret;
2550
2551 c1 = modified_fat_get(s, c);
2552
2553 assert((size - offset == 0 && fat_eof(s, c)) ||
2554 (size > offset && c >=2 && !fat_eof(s, c)));
2555
2556 ret = vvfat_read(s->bs, cluster2sector(s, c),
2557 (uint8_t*)cluster, (rest_size + 0x1ff) / 0x200);
2558
2559 if (ret < 0) {
2560 qemu_close(fd);
2561 g_free(cluster);
2562 return ret;
2563 }
2564
2565 if (write(fd, cluster, rest_size) < 0) {
2566 qemu_close(fd);
2567 g_free(cluster);
2568 return -2;
2569 }
2570
2571 offset += rest_size;
2572 c = c1;
2573 }
2574
2575 if (ftruncate(fd, size)) {
2576 perror("ftruncate()");
2577 qemu_close(fd);
2578 g_free(cluster);
2579 return -4;
2580 }
2581 qemu_close(fd);
2582 g_free(cluster);
2583
2584 return commit_mappings(s, first_cluster, dir_index);
2585}
2586
2587#ifdef DEBUG
2588
2589static void check1(BDRVVVFATState* s)
2590{
2591 int i;
2592 for (i = 0; i < s->mapping.next; i++) {
2593 mapping_t* mapping = array_get(&(s->mapping), i);
2594 if (mapping->mode & MODE_DELETED) {
2595 fprintf(stderr, "deleted\n");
2596 continue;
2597 }
2598 assert(mapping->dir_index < s->directory.next);
2599 direntry_t* direntry = array_get(&(s->directory), mapping->dir_index);
2600 assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
2601 if (mapping->mode & MODE_DIRECTORY) {
2602 assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
2603 assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0);
2604 }
2605 }
2606}
2607
2608
2609static void check2(BDRVVVFATState* s)
2610{
2611 int i;
2612 int first_mapping = -1;
2613
2614 for (i = 0; i < s->directory.next; i++) {
2615 direntry_t* direntry = array_get(&(s->directory), i);
2616
2617 if (is_short_name(direntry) && begin_of_direntry(direntry)) {
2618 mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry));
2619 assert(mapping);
2620 assert(mapping->dir_index == i || is_dot(direntry));
2621 assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry));
2622 }
2623
2624 if ((i % (0x10 * s->sectors_per_cluster)) == 0) {
2625
2626 int j, count = 0;
2627
2628 for (j = 0; j < s->mapping.next; j++) {
2629 mapping_t* mapping = array_get(&(s->mapping), j);
2630 if (mapping->mode & MODE_DELETED)
2631 continue;
2632 if (mapping->mode & MODE_DIRECTORY) {
2633 if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) {
2634 assert(++count == 1);
2635 if (mapping->first_mapping_index == -1)
2636 first_mapping = array_index(&(s->mapping), mapping);
2637 else
2638 assert(first_mapping == mapping->first_mapping_index);
2639 if (mapping->info.dir.parent_mapping_index < 0)
2640 assert(j == 0);
2641 else {
2642 mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index);
2643 assert(parent->mode & MODE_DIRECTORY);
2644 assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index);
2645 }
2646 }
2647 }
2648 }
2649 if (count == 0)
2650 first_mapping = -1;
2651 }
2652 }
2653}
2654#endif
2655
2656static int handle_renames_and_mkdirs(BDRVVVFATState* s)
2657{
2658 int i;
2659
2660#ifdef DEBUG
2661 fprintf(stderr, "handle_renames\n");
2662 for (i = 0; i < s->commits.next; i++) {
2663 commit_t* commit = array_get(&(s->commits), i);
2664 fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action);
2665 }
2666#endif
2667
2668 for (i = 0; i < s->commits.next;) {
2669 commit_t* commit = array_get(&(s->commits), i);
2670 if (commit->action == ACTION_RENAME) {
2671 mapping_t* mapping = find_mapping_for_cluster(s,
2672 commit->param.rename.cluster);
2673 char* old_path = mapping->path;
2674
2675 assert(commit->path);
2676 mapping->path = commit->path;
2677 if (rename(old_path, mapping->path))
2678 return -2;
2679
2680 if (mapping->mode & MODE_DIRECTORY) {
2681 int l1 = strlen(mapping->path);
2682 int l2 = strlen(old_path);
2683 int diff = l1 - l2;
2684 direntry_t* direntry = array_get(&(s->directory),
2685 mapping->info.dir.first_dir_index);
2686 uint32_t c = mapping->begin;
2687 int i = 0;
2688
2689
2690 while (!fat_eof(s, c)) {
2691 do {
2692 direntry_t* d = direntry + i;
2693
2694 if (is_file(d) || (is_directory(d) && !is_dot(d))) {
2695 mapping_t* m = find_mapping_for_cluster(s,
2696 begin_of_direntry(d));
2697 int l = strlen(m->path);
2698 char* new_path = g_malloc(l + diff + 1);
2699
2700 assert(!strncmp(m->path, mapping->path, l2));
2701
2702 pstrcpy(new_path, l + diff + 1, mapping->path);
2703 pstrcpy(new_path + l1, l + diff + 1 - l1,
2704 m->path + l2);
2705
2706 schedule_rename(s, m->begin, new_path);
2707 }
2708 i++;
2709 } while((i % (0x10 * s->sectors_per_cluster)) != 0);
2710 c = fat_get(s, c);
2711 }
2712 }
2713
2714 g_free(old_path);
2715 array_remove(&(s->commits), i);
2716 continue;
2717 } else if (commit->action == ACTION_MKDIR) {
2718 mapping_t* mapping;
2719 int j, parent_path_len;
2720
2721#ifdef __MINGW32__
2722 if (mkdir(commit->path))
2723 return -5;
2724#else
2725 if (mkdir(commit->path, 0755))
2726 return -5;
2727#endif
2728
2729 mapping = insert_mapping(s, commit->param.mkdir.cluster,
2730 commit->param.mkdir.cluster + 1);
2731 if (mapping == NULL)
2732 return -6;
2733
2734 mapping->mode = MODE_DIRECTORY;
2735 mapping->read_only = 0;
2736 mapping->path = commit->path;
2737 j = s->directory.next;
2738 assert(j);
2739 insert_direntries(s, s->directory.next,
2740 0x10 * s->sectors_per_cluster);
2741 mapping->info.dir.first_dir_index = j;
2742
2743 parent_path_len = strlen(commit->path)
2744 - strlen(get_basename(commit->path)) - 1;
2745 for (j = 0; j < s->mapping.next; j++) {
2746 mapping_t* m = array_get(&(s->mapping), j);
2747 if (m->first_mapping_index < 0 && m != mapping &&
2748 !strncmp(m->path, mapping->path, parent_path_len) &&
2749 strlen(m->path) == parent_path_len)
2750 break;
2751 }
2752 assert(j < s->mapping.next);
2753 mapping->info.dir.parent_mapping_index = j;
2754
2755 array_remove(&(s->commits), i);
2756 continue;
2757 }
2758
2759 i++;
2760 }
2761 return 0;
2762}
2763
2764
2765
2766
2767static int handle_commits(BDRVVVFATState* s)
2768{
2769 int i, fail = 0;
2770
2771 vvfat_close_current_file(s);
2772
2773 for (i = 0; !fail && i < s->commits.next; i++) {
2774 commit_t* commit = array_get(&(s->commits), i);
2775 switch(commit->action) {
2776 case ACTION_RENAME: case ACTION_MKDIR:
2777 abort();
2778 fail = -2;
2779 break;
2780 case ACTION_WRITEOUT: {
2781#ifndef NDEBUG
2782
2783 direntry_t* entry = array_get(&(s->directory),
2784 commit->param.writeout.dir_index);
2785 uint32_t begin = begin_of_direntry(entry);
2786 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2787#endif
2788
2789 assert(mapping);
2790 assert(mapping->begin == begin);
2791 assert(commit->path == NULL);
2792
2793 if (commit_one_file(s, commit->param.writeout.dir_index,
2794 commit->param.writeout.modified_offset))
2795 fail = -3;
2796
2797 break;
2798 }
2799 case ACTION_NEW_FILE: {
2800 int begin = commit->param.new_file.first_cluster;
2801 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2802 direntry_t* entry;
2803 int i;
2804
2805
2806 for (i = 0; i < s->directory.next; i++) {
2807 entry = array_get(&(s->directory), i);
2808 if (is_file(entry) && begin_of_direntry(entry) == begin)
2809 break;
2810 }
2811
2812 if (i >= s->directory.next) {
2813 fail = -6;
2814 continue;
2815 }
2816
2817
2818 if (mapping && mapping->begin != begin) {
2819 mapping->end = begin;
2820 mapping = NULL;
2821 }
2822 if (mapping == NULL) {
2823 mapping = insert_mapping(s, begin, begin+1);
2824 }
2825
2826 assert(commit->path);
2827 mapping->path = commit->path;
2828 mapping->read_only = 0;
2829 mapping->mode = MODE_NORMAL;
2830 mapping->info.file.offset = 0;
2831
2832 if (commit_one_file(s, i, 0))
2833 fail = -7;
2834
2835 break;
2836 }
2837 default:
2838 abort();
2839 }
2840 }
2841 if (i > 0 && array_remove_slice(&(s->commits), 0, i))
2842 return -1;
2843 return fail;
2844}
2845
2846static int handle_deletes(BDRVVVFATState* s)
2847{
2848 int i, deferred = 1, deleted = 1;
2849
2850
2851
2852 while (deferred && deleted) {
2853 deferred = 0;
2854 deleted = 0;
2855
2856 for (i = 1; i < s->mapping.next; i++) {
2857 mapping_t* mapping = array_get(&(s->mapping), i);
2858 if (mapping->mode & MODE_DELETED) {
2859 direntry_t* entry = array_get(&(s->directory),
2860 mapping->dir_index);
2861
2862 if (is_free(entry)) {
2863
2864 if (mapping->mode & MODE_DIRECTORY) {
2865 int j, next_dir_index = s->directory.next,
2866 first_dir_index = mapping->info.dir.first_dir_index;
2867
2868 if (rmdir(mapping->path) < 0) {
2869 if (errno == ENOTEMPTY) {
2870 deferred++;
2871 continue;
2872 } else
2873 return -5;
2874 }
2875
2876 for (j = 1; j < s->mapping.next; j++) {
2877 mapping_t* m = array_get(&(s->mapping), j);
2878 if (m->mode & MODE_DIRECTORY &&
2879 m->info.dir.first_dir_index >
2880 first_dir_index &&
2881 m->info.dir.first_dir_index <
2882 next_dir_index)
2883 next_dir_index =
2884 m->info.dir.first_dir_index;
2885 }
2886 remove_direntries(s, first_dir_index,
2887 next_dir_index - first_dir_index);
2888
2889 deleted++;
2890 }
2891 } else {
2892 if (unlink(mapping->path))
2893 return -4;
2894 deleted++;
2895 }
2896 DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
2897 remove_mapping(s, i);
2898 }
2899 }
2900 }
2901
2902 return 0;
2903}
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913static int do_commit(BDRVVVFATState* s)
2914{
2915 int ret = 0;
2916
2917
2918 if (s->commits.next == 0)
2919 return 0;
2920
2921 vvfat_close_current_file(s);
2922
2923 ret = handle_renames_and_mkdirs(s);
2924 if (ret) {
2925 fprintf(stderr, "Error handling renames (%d)\n", ret);
2926 abort();
2927 return ret;
2928 }
2929
2930
2931 memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
2932
2933
2934 ret = commit_direntries(s, 0, -1);
2935 if (ret) {
2936 fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
2937 abort();
2938 return ret;
2939 }
2940
2941 ret = handle_commits(s);
2942 if (ret) {
2943 fprintf(stderr, "Error handling commits (%d)\n", ret);
2944 abort();
2945 return ret;
2946 }
2947
2948 ret = handle_deletes(s);
2949 if (ret) {
2950 fprintf(stderr, "Error deleting\n");
2951 abort();
2952 return ret;
2953 }
2954
2955 if (s->qcow->bs->drv->bdrv_make_empty) {
2956 s->qcow->bs->drv->bdrv_make_empty(s->qcow->bs);
2957 }
2958
2959 memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
2960
2961DLOG(checkpoint());
2962 return 0;
2963}
2964
2965static int try_commit(BDRVVVFATState* s)
2966{
2967 vvfat_close_current_file(s);
2968DLOG(checkpoint());
2969 if(!is_consistent(s))
2970 return -1;
2971 return do_commit(s);
2972}
2973
2974static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
2975 const uint8_t *buf, int nb_sectors)
2976{
2977 BDRVVVFATState *s = bs->opaque;
2978 int i, ret;
2979
2980DLOG(checkpoint());
2981
2982
2983 if (s->qcow == NULL) {
2984 return -EACCES;
2985 }
2986
2987 vvfat_close_current_file(s);
2988
2989
2990
2991
2992
2993
2994 if (sector_num < s->offset_to_fat)
2995 return -1;
2996
2997 for (i = sector2cluster(s, sector_num);
2998 i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
2999 mapping_t* mapping = find_mapping_for_cluster(s, i);
3000 if (mapping) {
3001 if (mapping->read_only) {
3002 fprintf(stderr, "Tried to write to write-protected file %s\n",
3003 mapping->path);
3004 return -1;
3005 }
3006
3007 if (mapping->mode & MODE_DIRECTORY) {
3008 int begin = cluster2sector(s, i);
3009 int end = begin + s->sectors_per_cluster, k;
3010 int dir_index;
3011 const direntry_t* direntries;
3012 long_file_name lfn;
3013
3014 lfn_init(&lfn);
3015
3016 if (begin < sector_num)
3017 begin = sector_num;
3018 if (end > sector_num + nb_sectors)
3019 end = sector_num + nb_sectors;
3020 dir_index = mapping->dir_index +
3021 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
3022 direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
3023
3024 for (k = 0; k < (end - begin) * 0x10; k++) {
3025
3026 if (is_short_name(direntries + k) &&
3027 (direntries[k].attributes & 1)) {
3028 if (memcmp(direntries + k,
3029 array_get(&(s->directory), dir_index + k),
3030 sizeof(direntry_t))) {
3031 fprintf(stderr, "Warning: tried to write to write-protected file\n");
3032 return -1;
3033 }
3034 }
3035 }
3036 }
3037 i = mapping->end;
3038 } else
3039 i++;
3040 }
3041
3042
3043
3044
3045DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
3046 ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
3047 if (ret < 0) {
3048 fprintf(stderr, "Error writing to qcow backend\n");
3049 return ret;
3050 }
3051
3052 for (i = sector2cluster(s, sector_num);
3053 i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
3054 if (i >= 0)
3055 s->used_clusters[i] |= USED_ALLOCATED;
3056
3057DLOG(checkpoint());
3058
3059 try_commit(s);
3060
3061DLOG(checkpoint());
3062 return 0;
3063}
3064
3065static int coroutine_fn
3066vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
3067 QEMUIOVector *qiov, int flags)
3068{
3069 int ret;
3070 BDRVVVFATState *s = bs->opaque;
3071 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
3072 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
3073 void *buf;
3074
3075 assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
3076 assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
3077
3078 buf = g_try_malloc(bytes);
3079 if (bytes && buf == NULL) {
3080 return -ENOMEM;
3081 }
3082 qemu_iovec_to_buf(qiov, 0, buf, bytes);
3083
3084 qemu_co_mutex_lock(&s->lock);
3085 ret = vvfat_write(bs, sector_num, buf, nb_sectors);
3086 qemu_co_mutex_unlock(&s->lock);
3087
3088 g_free(buf);
3089
3090 return ret;
3091}
3092
3093static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
3094 int64_t sector_num, int nb_sectors, int *n, BlockDriverState **file)
3095{
3096 *n = bs->total_sectors - sector_num;
3097 if (*n > nb_sectors) {
3098 *n = nb_sectors;
3099 } else if (*n < 0) {
3100 return 0;
3101 }
3102 return BDRV_BLOCK_DATA;
3103}
3104
3105static int coroutine_fn
3106write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
3107 QEMUIOVector *qiov, int flags)
3108{
3109 int ret;
3110
3111 BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
3112 qemu_co_mutex_lock(&s->lock);
3113 ret = try_commit(s);
3114 qemu_co_mutex_unlock(&s->lock);
3115
3116 return ret;
3117}
3118
3119static void write_target_close(BlockDriverState *bs) {
3120 BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
3121 bdrv_unref_child(s->bs, s->qcow);
3122 g_free(s->qcow_filename);
3123}
3124
3125static BlockDriver vvfat_write_target = {
3126 .format_name = "vvfat_write_target",
3127 .instance_size = sizeof(void*),
3128 .bdrv_co_pwritev = write_target_commit,
3129 .bdrv_close = write_target_close,
3130};
3131
3132static void vvfat_qcow_options(int *child_flags, QDict *child_options,
3133 int parent_flags, QDict *parent_options)
3134{
3135 qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
3136 *child_flags = BDRV_O_NO_FLUSH;
3137}
3138
3139static const BdrvChildRole child_vvfat_qcow = {
3140 .inherit_options = vvfat_qcow_options,
3141};
3142
3143static int enable_write_target(BlockDriverState *bs, Error **errp)
3144{
3145 BDRVVVFATState *s = bs->opaque;
3146 BlockDriver *bdrv_qcow = NULL;
3147 BlockDriverState *backing;
3148 QemuOpts *opts = NULL;
3149 int ret;
3150 int size = sector2cluster(s, s->sector_count);
3151 QDict *options;
3152
3153 s->used_clusters = calloc(size, 1);
3154
3155 array_init(&(s->commits), sizeof(commit_t));
3156
3157 s->qcow_filename = g_malloc(PATH_MAX);
3158 ret = get_tmp_filename(s->qcow_filename, PATH_MAX);
3159 if (ret < 0) {
3160 error_setg_errno(errp, -ret, "can't create temporary file");
3161 goto err;
3162 }
3163
3164 bdrv_qcow = bdrv_find_format("qcow");
3165 if (!bdrv_qcow) {
3166 error_setg(errp, "Failed to locate qcow driver");
3167 ret = -ENOENT;
3168 goto err;
3169 }
3170
3171 opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
3172 qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512,
3173 &error_abort);
3174 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
3175
3176 ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
3177 qemu_opts_del(opts);
3178 if (ret < 0) {
3179 goto err;
3180 }
3181
3182 options = qdict_new();
3183 qdict_put_str(options, "write-target.driver", "qcow");
3184 s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
3185 &child_vvfat_qcow, false, errp);
3186 QDECREF(options);
3187 if (!s->qcow) {
3188 ret = -EINVAL;
3189 goto err;
3190 }
3191
3192#ifndef _WIN32
3193 unlink(s->qcow_filename);
3194#endif
3195
3196 backing = bdrv_new_open_driver(&vvfat_write_target, NULL, BDRV_O_ALLOW_RDWR,
3197 &error_abort);
3198 *(void**) backing->opaque = s;
3199
3200 bdrv_set_backing_hd(s->bs, backing, &error_abort);
3201 bdrv_unref(backing);
3202
3203 return 0;
3204
3205err:
3206 g_free(s->qcow_filename);
3207 s->qcow_filename = NULL;
3208 return ret;
3209}
3210
3211static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
3212 const BdrvChildRole *role,
3213 uint64_t perm, uint64_t shared,
3214 uint64_t *nperm, uint64_t *nshared)
3215{
3216 BDRVVVFATState *s = bs->opaque;
3217
3218 assert(c == s->qcow || role == &child_backing);
3219
3220 if (c == s->qcow) {
3221
3222 *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
3223 *nshared = BLK_PERM_WRITE_UNCHANGED;
3224 } else {
3225
3226
3227 *nperm = 0;
3228 *nshared = BLK_PERM_ALL;
3229 }
3230}
3231
3232static void vvfat_close(BlockDriverState *bs)
3233{
3234 BDRVVVFATState *s = bs->opaque;
3235
3236 vvfat_close_current_file(s);
3237 array_free(&(s->fat));
3238 array_free(&(s->directory));
3239 array_free(&(s->mapping));
3240 g_free(s->cluster_buffer);
3241
3242 if (s->qcow) {
3243 migrate_del_blocker(s->migration_blocker);
3244 error_free(s->migration_blocker);
3245 }
3246}
3247
3248static BlockDriver bdrv_vvfat = {
3249 .format_name = "vvfat",
3250 .protocol_name = "fat",
3251 .instance_size = sizeof(BDRVVVFATState),
3252
3253 .bdrv_parse_filename = vvfat_parse_filename,
3254 .bdrv_file_open = vvfat_open,
3255 .bdrv_refresh_limits = vvfat_refresh_limits,
3256 .bdrv_close = vvfat_close,
3257 .bdrv_child_perm = vvfat_child_perm,
3258
3259 .bdrv_co_preadv = vvfat_co_preadv,
3260 .bdrv_co_pwritev = vvfat_co_pwritev,
3261 .bdrv_co_get_block_status = vvfat_co_get_block_status,
3262};
3263
3264static void bdrv_vvfat_init(void)
3265{
3266 bdrv_register(&bdrv_vvfat);
3267}
3268
3269block_init(bdrv_vvfat_init);
3270
3271#ifdef DEBUG
3272static void checkpoint(void) {
3273 assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
3274 check1(vvv);
3275 check2(vvv);
3276 assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
3277#if 0
3278 if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
3279 fprintf(stderr, "Nonono!\n");
3280 mapping_t* mapping;
3281 direntry_t* direntry;
3282 assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
3283 assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
3284 if (vvv->mapping.next<47)
3285 return;
3286 assert((mapping = array_get(&(vvv->mapping), 47)));
3287 assert(mapping->dir_index < vvv->directory.next);
3288 direntry = array_get(&(vvv->directory), mapping->dir_index);
3289 assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
3290#endif
3291}
3292#endif
3293