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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/ctype.h"
38#include "qemu/cutils.h"
39#include "qemu/error-report.h"
40
41#ifndef S_IWGRP
42#define S_IWGRP 0
43#endif
44#ifndef S_IWOTH
45#define S_IWOTH 0
46#endif
47
48
49
50
51
52
53
54
55
56
57
58#ifdef DEBUG
59
60#define DLOG(a) a
61
62static void checkpoint(void);
63
64#else
65
66#define DLOG(a)
67
68#endif
69
70
71
72
73
74#define BOOTSECTOR_OEM_NAME "MSWIN4.1"
75
76#define DIR_DELETED 0xe5
77#define DIR_KANJI DIR_DELETED
78#define DIR_KANJI_FAKE 0x05
79#define DIR_FREE 0x00
80
81
82typedef struct array_t {
83 char* pointer;
84 unsigned int size,next,item_size;
85} array_t;
86
87static inline void array_init(array_t* array,unsigned int item_size)
88{
89 array->pointer = NULL;
90 array->size=0;
91 array->next=0;
92 array->item_size=item_size;
93}
94
95static inline void array_free(array_t* array)
96{
97 g_free(array->pointer);
98 array->size=array->next=0;
99}
100
101
102static inline void* array_get(array_t* array,unsigned int index) {
103 assert(index < array->next);
104 assert(array->pointer);
105 return array->pointer + index * array->item_size;
106}
107
108static inline void array_ensure_allocated(array_t *array, int index)
109{
110 if((index + 1) * array->item_size > array->size) {
111 int new_size = (index + 32) * array->item_size;
112 array->pointer = g_realloc(array->pointer, new_size);
113 assert(array->pointer);
114 memset(array->pointer + array->size, 0, new_size - array->size);
115 array->size = new_size;
116 array->next = index + 1;
117 }
118}
119
120static inline void* array_get_next(array_t* array) {
121 unsigned int next = array->next;
122
123 array_ensure_allocated(array, next);
124 array->next = next + 1;
125 return array_get(array, next);
126}
127
128static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
129 if((array->next+count)*array->item_size>array->size) {
130 int increment=count*array->item_size;
131 array->pointer=g_realloc(array->pointer,array->size+increment);
132 if(!array->pointer)
133 return NULL;
134 array->size+=increment;
135 }
136 memmove(array->pointer+(index+count)*array->item_size,
137 array->pointer+index*array->item_size,
138 (array->next-index)*array->item_size);
139 array->next+=count;
140 return array->pointer+index*array->item_size;
141}
142
143static inline int array_remove_slice(array_t* array,int index, int count)
144{
145 assert(index >=0);
146 assert(count > 0);
147 assert(index + count <= array->next);
148
149 memmove(array->pointer + index * array->item_size,
150 array->pointer + (index + count) * array->item_size,
151 (array->next - index - count) * array->item_size);
152
153 array->next -= count;
154 return 0;
155}
156
157static int array_remove(array_t* array,int index)
158{
159 return array_remove_slice(array, index, 1);
160}
161
162
163static int array_index(array_t* array, void* pointer)
164{
165 size_t offset = (char*)pointer - array->pointer;
166 assert((offset % array->item_size) == 0);
167 assert(offset/array->item_size < array->next);
168 return offset/array->item_size;
169}
170
171
172
173
174typedef struct bootsector_t {
175 uint8_t jump[3];
176 uint8_t name[8];
177 uint16_t sector_size;
178 uint8_t sectors_per_cluster;
179 uint16_t reserved_sectors;
180 uint8_t number_of_fats;
181 uint16_t root_entries;
182 uint16_t total_sectors16;
183 uint8_t media_type;
184 uint16_t sectors_per_fat;
185 uint16_t sectors_per_track;
186 uint16_t number_of_heads;
187 uint32_t hidden_sectors;
188 uint32_t total_sectors;
189 union {
190 struct {
191 uint8_t drive_number;
192 uint8_t reserved1;
193 uint8_t signature;
194 uint32_t id;
195 uint8_t volume_label[11];
196 uint8_t fat_type[8];
197 uint8_t ignored[0x1c0];
198 } QEMU_PACKED fat16;
199 struct {
200 uint32_t sectors_per_fat;
201 uint16_t flags;
202 uint8_t major,minor;
203 uint32_t first_cluster_of_root_dir;
204 uint16_t info_sector;
205 uint16_t backup_boot_sector;
206 uint8_t reserved[12];
207 uint8_t drive_number;
208 uint8_t reserved1;
209 uint8_t signature;
210 uint32_t id;
211 uint8_t volume_label[11];
212 uint8_t fat_type[8];
213 uint8_t ignored[0x1a4];
214 } QEMU_PACKED fat32;
215 } u;
216 uint8_t magic[2];
217} QEMU_PACKED bootsector_t;
218
219typedef struct {
220 uint8_t head;
221 uint8_t sector;
222 uint8_t cylinder;
223} mbr_chs_t;
224
225typedef struct partition_t {
226 uint8_t attributes;
227 mbr_chs_t start_CHS;
228 uint8_t fs_type;
229 mbr_chs_t end_CHS;
230 uint32_t start_sector_long;
231 uint32_t length_sector_long;
232} QEMU_PACKED partition_t;
233
234typedef struct mbr_t {
235 uint8_t ignored[0x1b8];
236 uint32_t nt_id;
237 uint8_t ignored2[2];
238 partition_t partition[4];
239 uint8_t magic[2];
240} QEMU_PACKED mbr_t;
241
242typedef struct direntry_t {
243 uint8_t name[8 + 3];
244 uint8_t attributes;
245 uint8_t reserved[2];
246 uint16_t ctime;
247 uint16_t cdate;
248 uint16_t adate;
249 uint16_t begin_hi;
250 uint16_t mtime;
251 uint16_t mdate;
252 uint16_t begin;
253 uint32_t size;
254} QEMU_PACKED direntry_t;
255
256
257
258typedef struct mapping_t {
259
260 uint32_t begin,end;
261
262 unsigned int dir_index;
263
264 int first_mapping_index;
265 union {
266
267
268
269
270 struct {
271 uint32_t offset;
272 } file;
273 struct {
274 int parent_mapping_index;
275 int first_dir_index;
276 } dir;
277 } info;
278
279 char* path;
280
281 enum {
282 MODE_UNDEFINED = 0,
283 MODE_NORMAL = 1,
284 MODE_MODIFIED = 2,
285 MODE_DIRECTORY = 4,
286 MODE_DELETED = 8,
287 } mode;
288 int read_only;
289} mapping_t;
290
291#ifdef DEBUG
292static void print_direntry(const struct direntry_t*);
293static void print_mapping(const struct mapping_t* mapping);
294#endif
295
296
297
298typedef struct BDRVVVFATState {
299 CoMutex lock;
300 BlockDriverState* bs;
301 unsigned char first_sectors[0x40*0x200];
302
303 int fat_type;
304 array_t fat,directory,mapping;
305 char volume_label[11];
306
307 uint32_t offset_to_bootsector;
308
309 unsigned int cluster_size;
310 unsigned int sectors_per_cluster;
311 unsigned int sectors_per_fat;
312 uint32_t last_cluster_of_root_directory;
313
314 uint16_t root_entries;
315 uint32_t sector_count;
316 uint32_t cluster_count;
317 uint32_t max_fat_value;
318 uint32_t offset_to_fat;
319 uint32_t offset_to_root_dir;
320
321 int current_fd;
322 mapping_t* current_mapping;
323 unsigned char* cluster;
324 unsigned char* cluster_buffer;
325 unsigned int current_cluster;
326
327
328 char* qcow_filename;
329 BdrvChild* qcow;
330 void* fat2;
331 char* used_clusters;
332 array_t commits;
333 const char* path;
334 int downcase_short_names;
335
336 Error *migration_blocker;
337} BDRVVVFATState;
338
339
340
341
342
343static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs)
344{
345 int head,sector;
346 sector = spos % secs; spos /= secs;
347 head = spos % heads; spos /= heads;
348 if (spos >= cyls) {
349
350
351
352 chs->head = 0xFF;
353 chs->sector = 0xFF;
354 chs->cylinder = 0xFF;
355 return 1;
356 }
357 chs->head = (uint8_t)head;
358 chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
359 chs->cylinder = (uint8_t)spos;
360 return 0;
361}
362
363static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
364{
365
366 mbr_t* real_mbr=(mbr_t*)s->first_sectors;
367 partition_t* partition = &(real_mbr->partition[0]);
368 int lba;
369
370 memset(s->first_sectors,0,512);
371
372
373 real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
374
375 partition->attributes=0x80;
376
377
378 lba = sector2CHS(&partition->start_CHS, s->offset_to_bootsector,
379 cyls, heads, secs);
380 lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
381 cyls, heads, secs);
382
383
384 partition->start_sector_long = cpu_to_le32(s->offset_to_bootsector);
385 partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
386 - s->offset_to_bootsector);
387
388
389
390
391 partition->fs_type = s->fat_type == 12 ? 0x1 :
392 s->fat_type == 16 ? (lba ? 0xe : 0x06) :
393 (lba ? 0xc : 0x0b);
394
395 real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
396}
397
398
399
400static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
401{
402 int number_of_entries, i;
403 glong length;
404 direntry_t *entry;
405
406 gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
407 if (!longname) {
408 fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
409 return NULL;
410 }
411
412 number_of_entries = DIV_ROUND_UP(length * 2, 26);
413
414 for(i=0;i<number_of_entries;i++) {
415 entry=array_get_next(&(s->directory));
416 entry->attributes=0xf;
417 entry->reserved[0]=0;
418 entry->begin=0;
419 entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
420 }
421 for(i=0;i<26*number_of_entries;i++) {
422 int offset=(i%26);
423 if(offset<10) offset=1+offset;
424 else if(offset<22) offset=14+offset-10;
425 else offset=28+offset-22;
426 entry=array_get(&(s->directory),s->directory.next-1-(i/26));
427 if (i >= 2 * length + 2) {
428 entry->name[offset] = 0xff;
429 } else if (i % 2 == 0) {
430 entry->name[offset] = longname[i / 2] & 0xff;
431 } else {
432 entry->name[offset] = longname[i / 2] >> 8;
433 }
434 }
435 g_free(longname);
436 return array_get(&(s->directory),s->directory.next-number_of_entries);
437}
438
439static char is_free(const direntry_t* direntry)
440{
441 return direntry->name[0] == DIR_DELETED || direntry->name[0] == DIR_FREE;
442}
443
444static char is_volume_label(const direntry_t* direntry)
445{
446 return direntry->attributes == 0x28;
447}
448
449static char is_long_name(const direntry_t* direntry)
450{
451 return direntry->attributes == 0xf;
452}
453
454static char is_short_name(const direntry_t* direntry)
455{
456 return !is_volume_label(direntry) && !is_long_name(direntry)
457 && !is_free(direntry);
458}
459
460static char is_directory(const direntry_t* direntry)
461{
462 return direntry->attributes & 0x10 && direntry->name[0] != DIR_DELETED;
463}
464
465static inline char is_dot(const direntry_t* direntry)
466{
467 return is_short_name(direntry) && direntry->name[0] == '.';
468}
469
470static char is_file(const direntry_t* direntry)
471{
472 return is_short_name(direntry) && !is_directory(direntry);
473}
474
475static inline uint32_t begin_of_direntry(const direntry_t* direntry)
476{
477 return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
478}
479
480static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
481{
482 return le32_to_cpu(direntry->size);
483}
484
485static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
486{
487 direntry->begin = cpu_to_le16(begin & 0xffff);
488 direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
489}
490
491static bool valid_filename(const unsigned char *name)
492{
493 unsigned char c;
494 if (!strcmp((const char*)name, ".") || !strcmp((const char*)name, "..")) {
495 return false;
496 }
497 for (; (c = *name); name++) {
498 if (!((c >= '0' && c <= '9') ||
499 (c >= 'A' && c <= 'Z') ||
500 (c >= 'a' && c <= 'z') ||
501 c > 127 ||
502 strchr("$%'-_@~`!(){}^#&.+,;=[]", c) != NULL))
503 {
504 return false;
505 }
506 }
507 return true;
508}
509
510static uint8_t to_valid_short_char(gunichar c)
511{
512 c = g_unichar_toupper(c);
513 if ((c >= '0' && c <= '9') ||
514 (c >= 'A' && c <= 'Z') ||
515 strchr("$%'-_@~`!(){}^#&", c) != NULL) {
516 return c;
517 } else {
518 return 0;
519 }
520}
521
522static direntry_t *create_short_filename(BDRVVVFATState *s,
523 const char *filename,
524 unsigned int directory_start)
525{
526 int i, j = 0;
527 direntry_t *entry = array_get_next(&(s->directory));
528 const gchar *p, *last_dot = NULL;
529 gunichar c;
530 bool lossy_conversion = false;
531 char tail[8];
532
533 if (!entry) {
534 return NULL;
535 }
536 memset(entry->name, 0x20, sizeof(entry->name));
537
538
539 for (p = filename; ; p = g_utf8_next_char(p)) {
540 c = g_utf8_get_char(p);
541 if (c == '\0') {
542 break;
543 } else if (c == '.') {
544 if (j == 0) {
545
546 lossy_conversion = true;
547 } else {
548 if (last_dot) {
549 lossy_conversion = true;
550 }
551 last_dot = p;
552 }
553 } else if (!last_dot) {
554
555 uint8_t v = to_valid_short_char(c);
556 if (j < 8 && v) {
557 entry->name[j++] = v;
558 } else {
559 lossy_conversion = true;
560 }
561 }
562 }
563
564
565 if (last_dot) {
566 j = 0;
567 for (p = g_utf8_next_char(last_dot); ; p = g_utf8_next_char(p)) {
568 c = g_utf8_get_char(p);
569 if (c == '\0') {
570 break;
571 } else {
572
573 uint8_t v = to_valid_short_char(c);
574 if (j < 3 && v) {
575 entry->name[8 + (j++)] = v;
576 } else {
577 lossy_conversion = true;
578 }
579 }
580 }
581 }
582
583 if (entry->name[0] == DIR_KANJI) {
584 entry->name[0] = DIR_KANJI_FAKE;
585 }
586
587
588 for (j = 0; j < 8; j++) {
589 if (entry->name[j] == ' ') {
590 break;
591 }
592 }
593 for (i = lossy_conversion ? 1 : 0; i < 999999; i++) {
594 direntry_t *entry1;
595 if (i > 0) {
596 int len = snprintf(tail, sizeof(tail), "~%u", (unsigned)i);
597 assert(len <= 7);
598 memcpy(entry->name + MIN(j, 8 - len), tail, len);
599 }
600 for (entry1 = array_get(&(s->directory), directory_start);
601 entry1 < entry; entry1++) {
602 if (!is_long_name(entry1) &&
603 !memcmp(entry1->name, entry->name, 11)) {
604 break;
605 }
606 }
607 if (entry1 == entry) {
608
609 return entry;
610 }
611 }
612 return NULL;
613}
614
615
616
617static inline uint8_t fat_chksum(const direntry_t* entry)
618{
619 uint8_t chksum=0;
620 int i;
621
622 for (i = 0; i < ARRAY_SIZE(entry->name); i++) {
623 chksum = (((chksum & 0xfe) >> 1) |
624 ((chksum & 0x01) ? 0x80 : 0)) + entry->name[i];
625 }
626
627 return chksum;
628}
629
630
631static uint16_t fat_datetime(time_t time,int return_time) {
632 struct tm* t;
633 struct tm t1;
634 t = &t1;
635 localtime_r(&time,t);
636 if(return_time)
637 return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
638 return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
639}
640
641static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
642{
643 if(s->fat_type==32) {
644 uint32_t* entry=array_get(&(s->fat),cluster);
645 *entry=cpu_to_le32(value);
646 } else if(s->fat_type==16) {
647 uint16_t* entry=array_get(&(s->fat),cluster);
648 *entry=cpu_to_le16(value&0xffff);
649 } else {
650 int offset = (cluster*3/2);
651 unsigned char* p = array_get(&(s->fat), offset);
652 switch (cluster&1) {
653 case 0:
654 p[0] = value&0xff;
655 p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
656 break;
657 case 1:
658 p[0] = (p[0]&0xf) | ((value&0xf)<<4);
659 p[1] = (value>>4);
660 break;
661 }
662 }
663}
664
665static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
666{
667 if(s->fat_type==32) {
668 uint32_t* entry=array_get(&(s->fat),cluster);
669 return le32_to_cpu(*entry);
670 } else if(s->fat_type==16) {
671 uint16_t* entry=array_get(&(s->fat),cluster);
672 return le16_to_cpu(*entry);
673 } else {
674 const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
675 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
676 }
677}
678
679static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
680{
681 if(fat_entry>s->max_fat_value-8)
682 return -1;
683 return 0;
684}
685
686static inline void init_fat(BDRVVVFATState* s)
687{
688 if (s->fat_type == 12) {
689 array_init(&(s->fat),1);
690 array_ensure_allocated(&(s->fat),
691 s->sectors_per_fat * 0x200 * 3 / 2 - 1);
692 } else {
693 array_init(&(s->fat),(s->fat_type==32?4:2));
694 array_ensure_allocated(&(s->fat),
695 s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
696 }
697 memset(s->fat.pointer,0,s->fat.size);
698
699 switch(s->fat_type) {
700 case 12: s->max_fat_value=0xfff; break;
701 case 16: s->max_fat_value=0xffff; break;
702 case 32: s->max_fat_value=0x0fffffff; break;
703 default: s->max_fat_value=0;
704 }
705
706}
707
708static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
709 unsigned int directory_start, const char* filename, int is_dot)
710{
711 int long_index = s->directory.next;
712 direntry_t* entry = NULL;
713 direntry_t* entry_long = NULL;
714
715 if(is_dot) {
716 entry=array_get_next(&(s->directory));
717 memset(entry->name, 0x20, sizeof(entry->name));
718 memcpy(entry->name,filename,strlen(filename));
719 return entry;
720 }
721
722 entry_long=create_long_filename(s,filename);
723 entry = create_short_filename(s, filename, directory_start);
724
725
726 if(entry_long) {
727 uint8_t chksum=fat_chksum(entry);
728
729
730 entry_long=array_get(&(s->directory),long_index);
731 while(entry_long<entry && is_long_name(entry_long)) {
732 entry_long->reserved[1]=chksum;
733 entry_long++;
734 }
735 }
736
737 return entry;
738}
739
740
741
742
743static int read_directory(BDRVVVFATState* s, int mapping_index)
744{
745 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
746 direntry_t* direntry;
747 const char* dirname = mapping->path;
748 int first_cluster = mapping->begin;
749 int parent_index = mapping->info.dir.parent_mapping_index;
750 mapping_t* parent_mapping = (mapping_t*)
751 (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL);
752 int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
753
754 DIR* dir=opendir(dirname);
755 struct dirent* entry;
756 int i;
757
758 assert(mapping->mode & MODE_DIRECTORY);
759
760 if(!dir) {
761 mapping->end = mapping->begin;
762 return -1;
763 }
764
765 i = mapping->info.dir.first_dir_index =
766 first_cluster == 0 ? 0 : s->directory.next;
767
768 if (first_cluster != 0) {
769
770 (void)create_short_and_long_name(s, i, ".", 1);
771 (void)create_short_and_long_name(s, i, "..", 1);
772 }
773
774
775 while((entry=readdir(dir))) {
776 unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
777 char* buffer;
778 direntry_t* direntry;
779 struct stat st;
780 int is_dot=!strcmp(entry->d_name,".");
781 int is_dotdot=!strcmp(entry->d_name,"..");
782
783 if (first_cluster == 0 && s->directory.next >= s->root_entries - 1) {
784 fprintf(stderr, "Too many entries in root directory\n");
785 closedir(dir);
786 return -2;
787 }
788
789 if(first_cluster == 0 && (is_dotdot || is_dot))
790 continue;
791
792 buffer = g_malloc(length);
793 snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
794
795 if(stat(buffer,&st)<0) {
796 g_free(buffer);
797 continue;
798 }
799
800
801 if (!is_dot && !is_dotdot) {
802 direntry = create_short_and_long_name(s, i, entry->d_name, 0);
803 } else {
804 direntry = array_get(&(s->directory), is_dot ? i : i + 1);
805 }
806 direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
807 direntry->reserved[0]=direntry->reserved[1]=0;
808 direntry->ctime=fat_datetime(st.st_ctime,1);
809 direntry->cdate=fat_datetime(st.st_ctime,0);
810 direntry->adate=fat_datetime(st.st_atime,0);
811 direntry->begin_hi=0;
812 direntry->mtime=fat_datetime(st.st_mtime,1);
813 direntry->mdate=fat_datetime(st.st_mtime,0);
814 if(is_dotdot)
815 set_begin_of_direntry(direntry, first_cluster_of_parent);
816 else if(is_dot)
817 set_begin_of_direntry(direntry, first_cluster);
818 else
819 direntry->begin=0;
820 if (st.st_size > 0x7fffffff) {
821 fprintf(stderr, "File %s is larger than 2GB\n", buffer);
822 g_free(buffer);
823 closedir(dir);
824 return -2;
825 }
826 direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
827
828
829 if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
830 s->current_mapping = array_get_next(&(s->mapping));
831 s->current_mapping->begin=0;
832 s->current_mapping->end=st.st_size;
833
834
835
836
837 s->current_mapping->dir_index=s->directory.next-1;
838 s->current_mapping->first_mapping_index = -1;
839 if (S_ISDIR(st.st_mode)) {
840 s->current_mapping->mode = MODE_DIRECTORY;
841 s->current_mapping->info.dir.parent_mapping_index =
842 mapping_index;
843 } else {
844 s->current_mapping->mode = MODE_UNDEFINED;
845 s->current_mapping->info.file.offset = 0;
846 }
847 s->current_mapping->path=buffer;
848 s->current_mapping->read_only =
849 (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
850 } else {
851 g_free(buffer);
852 }
853 }
854 closedir(dir);
855
856
857 while(s->directory.next%(0x10*s->sectors_per_cluster)) {
858 direntry_t* direntry=array_get_next(&(s->directory));
859 memset(direntry,0,sizeof(direntry_t));
860 }
861
862 if (s->fat_type != 32 &&
863 mapping_index == 0 &&
864 s->directory.next < s->root_entries) {
865
866 int cur = s->directory.next;
867 array_ensure_allocated(&(s->directory), s->root_entries - 1);
868 s->directory.next = s->root_entries;
869 memset(array_get(&(s->directory), cur), 0,
870 (s->root_entries - cur) * sizeof(direntry_t));
871 }
872
873
874 mapping = array_get(&(s->mapping), mapping_index);
875 first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
876 * 0x20 / s->cluster_size;
877 mapping->end = first_cluster;
878
879 direntry = array_get(&(s->directory), mapping->dir_index);
880 set_begin_of_direntry(direntry, mapping->begin);
881
882 return 0;
883}
884
885static inline int32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
886{
887 return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
888}
889
890static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
891{
892 return s->offset_to_root_dir + s->sectors_per_cluster * cluster_num;
893}
894
895static int init_directories(BDRVVVFATState* s,
896 const char *dirname, int heads, int secs,
897 Error **errp)
898{
899 bootsector_t* bootsector;
900 mapping_t* mapping;
901 unsigned int i;
902 unsigned int cluster;
903
904 memset(&(s->first_sectors[0]),0,0x40*0x200);
905
906 s->cluster_size=s->sectors_per_cluster*0x200;
907 s->cluster_buffer=g_malloc(s->cluster_size);
908
909
910
911
912
913
914
915
916 i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
917 s->sectors_per_fat=(s->sector_count+i)/i;
918
919 s->offset_to_fat = s->offset_to_bootsector + 1;
920 s->offset_to_root_dir = s->offset_to_fat + s->sectors_per_fat * 2;
921
922 array_init(&(s->mapping),sizeof(mapping_t));
923 array_init(&(s->directory),sizeof(direntry_t));
924
925
926 {
927 direntry_t* entry=array_get_next(&(s->directory));
928 entry->attributes=0x28;
929 memcpy(entry->name, s->volume_label, sizeof(entry->name));
930 }
931
932
933 init_fat(s);
934
935
936 s->root_entries = 0x02 * 0x10 * s->sectors_per_cluster;
937 s->cluster_count=sector2cluster(s, s->sector_count);
938
939 mapping = array_get_next(&(s->mapping));
940 mapping->begin = 0;
941 mapping->dir_index = 0;
942 mapping->info.dir.parent_mapping_index = -1;
943 mapping->first_mapping_index = -1;
944 mapping->path = g_strdup(dirname);
945 i = strlen(mapping->path);
946 if (i > 0 && mapping->path[i - 1] == '/')
947 mapping->path[i - 1] = '\0';
948 mapping->mode = MODE_DIRECTORY;
949 mapping->read_only = 0;
950 s->path = mapping->path;
951
952 for (i = 0, cluster = 0; i < s->mapping.next; i++) {
953
954
955
956 int fix_fat = (i != 0);
957 mapping = array_get(&(s->mapping), i);
958
959 if (mapping->mode & MODE_DIRECTORY) {
960 char *path = mapping->path;
961 mapping->begin = cluster;
962 if(read_directory(s, i)) {
963 error_setg(errp, "Could not read directory %s", path);
964 return -1;
965 }
966 mapping = array_get(&(s->mapping), i);
967 } else {
968 assert(mapping->mode == MODE_UNDEFINED);
969 mapping->mode=MODE_NORMAL;
970 mapping->begin = cluster;
971 if (mapping->end > 0) {
972 direntry_t* direntry = array_get(&(s->directory),
973 mapping->dir_index);
974
975 mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
976 set_begin_of_direntry(direntry, mapping->begin);
977 } else {
978 mapping->end = cluster + 1;
979 fix_fat = 0;
980 }
981 }
982
983 assert(mapping->begin < mapping->end);
984
985
986 cluster = mapping->end;
987
988 if(cluster > s->cluster_count) {
989 error_setg(errp,
990 "Directory does not fit in FAT%d (capacity %.2f MB)",
991 s->fat_type, s->sector_count / 2000.0);
992 return -1;
993 }
994
995
996 if (fix_fat) {
997 int j;
998 for(j = mapping->begin; j < mapping->end - 1; j++)
999 fat_set(s, j, j+1);
1000 fat_set(s, mapping->end - 1, s->max_fat_value);
1001 }
1002 }
1003
1004 mapping = array_get(&(s->mapping), 0);
1005 s->last_cluster_of_root_directory = mapping->end;
1006
1007
1008 fat_set(s,0,s->max_fat_value);
1009 fat_set(s,1,s->max_fat_value);
1010
1011 s->current_mapping = NULL;
1012
1013 bootsector = (bootsector_t *)(s->first_sectors
1014 + s->offset_to_bootsector * 0x200);
1015 bootsector->jump[0]=0xeb;
1016 bootsector->jump[1]=0x3e;
1017 bootsector->jump[2]=0x90;
1018 memcpy(bootsector->name, BOOTSECTOR_OEM_NAME, 8);
1019 bootsector->sector_size=cpu_to_le16(0x200);
1020 bootsector->sectors_per_cluster=s->sectors_per_cluster;
1021 bootsector->reserved_sectors=cpu_to_le16(1);
1022 bootsector->number_of_fats=0x2;
1023 bootsector->root_entries = cpu_to_le16(s->root_entries);
1024 bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
1025
1026 bootsector->media_type = (s->offset_to_bootsector > 0 ? 0xf8 : 0xf0);
1027 s->fat.pointer[0] = bootsector->media_type;
1028 bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
1029 bootsector->sectors_per_track = cpu_to_le16(secs);
1030 bootsector->number_of_heads = cpu_to_le16(heads);
1031 bootsector->hidden_sectors = cpu_to_le32(s->offset_to_bootsector);
1032 bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
1033
1034
1035
1036 bootsector->u.fat16.drive_number = s->offset_to_bootsector == 0 ? 0 : 0x80;
1037 bootsector->u.fat16.signature=0x29;
1038 bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
1039
1040 memcpy(bootsector->u.fat16.volume_label, s->volume_label,
1041 sizeof(bootsector->u.fat16.volume_label));
1042 memcpy(bootsector->u.fat16.fat_type,
1043 s->fat_type == 12 ? "FAT12 " : "FAT16 ", 8);
1044 bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
1045
1046 return 0;
1047}
1048
1049#ifdef DEBUG
1050static BDRVVVFATState *vvv = NULL;
1051#endif
1052
1053static int enable_write_target(BlockDriverState *bs, Error **errp);
1054static int is_consistent(BDRVVVFATState *s);
1055
1056static QemuOptsList runtime_opts = {
1057 .name = "vvfat",
1058 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1059 .desc = {
1060 {
1061 .name = "dir",
1062 .type = QEMU_OPT_STRING,
1063 .help = "Host directory to map to the vvfat device",
1064 },
1065 {
1066 .name = "fat-type",
1067 .type = QEMU_OPT_NUMBER,
1068 .help = "FAT type (12, 16 or 32)",
1069 },
1070 {
1071 .name = "floppy",
1072 .type = QEMU_OPT_BOOL,
1073 .help = "Create a floppy rather than a hard disk image",
1074 },
1075 {
1076 .name = "label",
1077 .type = QEMU_OPT_STRING,
1078 .help = "Use a volume label other than QEMU VVFAT",
1079 },
1080 {
1081 .name = "rw",
1082 .type = QEMU_OPT_BOOL,
1083 .help = "Make the image writable",
1084 },
1085 { }
1086 },
1087};
1088
1089static void vvfat_parse_filename(const char *filename, QDict *options,
1090 Error **errp)
1091{
1092 int fat_type = 0;
1093 bool floppy = false;
1094 bool rw = false;
1095 int i;
1096
1097 if (!strstart(filename, "fat:", NULL)) {
1098 error_setg(errp, "File name string must start with 'fat:'");
1099 return;
1100 }
1101
1102
1103 if (strstr(filename, ":32:")) {
1104 fat_type = 32;
1105 } else if (strstr(filename, ":16:")) {
1106 fat_type = 16;
1107 } else if (strstr(filename, ":12:")) {
1108 fat_type = 12;
1109 }
1110
1111 if (strstr(filename, ":floppy:")) {
1112 floppy = true;
1113 }
1114
1115 if (strstr(filename, ":rw:")) {
1116 rw = true;
1117 }
1118
1119
1120 i = strrchr(filename, ':') - filename;
1121 assert(i >= 3);
1122 if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
1123
1124 filename += i - 1;
1125 } else {
1126 filename += i + 1;
1127 }
1128
1129
1130 qdict_put_str(options, "dir", filename);
1131 qdict_put_int(options, "fat-type", fat_type);
1132 qdict_put_bool(options, "floppy", floppy);
1133 qdict_put_bool(options, "rw", rw);
1134}
1135
1136static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
1137 Error **errp)
1138{
1139 BDRVVVFATState *s = bs->opaque;
1140 int cyls, heads, secs;
1141 bool floppy;
1142 const char *dirname, *label;
1143 QemuOpts *opts;
1144 int ret;
1145
1146#ifdef DEBUG
1147 vvv = s;
1148#endif
1149
1150 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1151 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1152 ret = -EINVAL;
1153 goto fail;
1154 }
1155
1156 dirname = qemu_opt_get(opts, "dir");
1157 if (!dirname) {
1158 error_setg(errp, "vvfat block driver requires a 'dir' option");
1159 ret = -EINVAL;
1160 goto fail;
1161 }
1162
1163 s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
1164 floppy = qemu_opt_get_bool(opts, "floppy", false);
1165
1166 memset(s->volume_label, ' ', sizeof(s->volume_label));
1167 label = qemu_opt_get(opts, "label");
1168 if (label) {
1169 size_t label_length = strlen(label);
1170 if (label_length > 11) {
1171 error_setg(errp, "vvfat label cannot be longer than 11 bytes");
1172 ret = -EINVAL;
1173 goto fail;
1174 }
1175 memcpy(s->volume_label, label, label_length);
1176 } else {
1177 memcpy(s->volume_label, "QEMU VVFAT", 10);
1178 }
1179
1180 if (floppy) {
1181
1182 if (!s->fat_type) {
1183 s->fat_type = 12;
1184 secs = 36;
1185 s->sectors_per_cluster = 2;
1186 } else {
1187 secs = s->fat_type == 12 ? 18 : 36;
1188 s->sectors_per_cluster = 1;
1189 }
1190 cyls = 80;
1191 heads = 2;
1192 } else {
1193
1194 if (!s->fat_type) {
1195 s->fat_type = 16;
1196 }
1197 s->offset_to_bootsector = 0x3f;
1198 cyls = s->fat_type == 12 ? 64 : 1024;
1199 heads = 16;
1200 secs = 63;
1201 }
1202
1203 switch (s->fat_type) {
1204 case 32:
1205 warn_report("FAT32 has not been tested. You are welcome to do so!");
1206 break;
1207 case 16:
1208 case 12:
1209 break;
1210 default:
1211 error_setg(errp, "Valid FAT types are only 12, 16 and 32");
1212 ret = -EINVAL;
1213 goto fail;
1214 }
1215
1216
1217 s->bs = bs;
1218
1219
1220 s->sectors_per_cluster=0x10;
1221
1222 s->current_cluster=0xffffffff;
1223
1224 s->qcow = NULL;
1225 s->qcow_filename = NULL;
1226 s->fat2 = NULL;
1227 s->downcase_short_names = 1;
1228
1229 DLOG(fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
1230 dirname, cyls, heads, secs));
1231
1232 s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
1233 bs->total_sectors = cyls * heads * secs;
1234
1235 if (qemu_opt_get_bool(opts, "rw", false)) {
1236 if (!bdrv_is_read_only(bs)) {
1237 ret = enable_write_target(bs, errp);
1238 if (ret < 0) {
1239 goto fail;
1240 }
1241 } else {
1242 ret = -EPERM;
1243 error_setg(errp,
1244 "Unable to set VVFAT to 'rw' when drive is read-only");
1245 goto fail;
1246 }
1247 } else {
1248 ret = bdrv_apply_auto_read_only(bs, NULL, errp);
1249 if (ret < 0) {
1250 goto fail;
1251 }
1252 }
1253
1254 if (init_directories(s, dirname, heads, secs, errp)) {
1255 ret = -EIO;
1256 goto fail;
1257 }
1258
1259 s->sector_count = s->offset_to_root_dir
1260 + s->sectors_per_cluster * s->cluster_count;
1261
1262
1263 if (s->qcow) {
1264 error_setg(&s->migration_blocker,
1265 "The vvfat (rw) format used by node '%s' "
1266 "does not support live migration",
1267 bdrv_get_device_or_node_name(bs));
1268 ret = migrate_add_blocker(s->migration_blocker, errp);
1269 if (ret < 0) {
1270 error_free(s->migration_blocker);
1271 goto fail;
1272 }
1273 }
1274
1275 if (s->offset_to_bootsector > 0) {
1276 init_mbr(s, cyls, heads, secs);
1277 }
1278
1279 qemu_co_mutex_init(&s->lock);
1280
1281 qemu_opts_del(opts);
1282
1283 return 0;
1284
1285fail:
1286 g_free(s->qcow_filename);
1287 s->qcow_filename = NULL;
1288 g_free(s->cluster_buffer);
1289 s->cluster_buffer = NULL;
1290 g_free(s->used_clusters);
1291 s->used_clusters = NULL;
1292
1293 qemu_opts_del(opts);
1294 return ret;
1295}
1296
1297static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
1298{
1299 bs->bl.request_alignment = BDRV_SECTOR_SIZE;
1300}
1301
1302static inline void vvfat_close_current_file(BDRVVVFATState *s)
1303{
1304 if(s->current_mapping) {
1305 s->current_mapping = NULL;
1306 if (s->current_fd) {
1307 qemu_close(s->current_fd);
1308 s->current_fd = 0;
1309 }
1310 }
1311 s->current_cluster = -1;
1312}
1313
1314
1315
1316
1317static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
1318{
1319 while(1) {
1320 int index3;
1321 mapping_t* mapping;
1322 index3=(index1+index2)/2;
1323 mapping=array_get(&(s->mapping),index3);
1324 assert(mapping->begin < mapping->end);
1325 if(mapping->begin>=cluster_num) {
1326 assert(index2!=index3 || index2==0);
1327 if(index2==index3)
1328 return index1;
1329 index2=index3;
1330 } else {
1331 if(index1==index3)
1332 return mapping->end<=cluster_num ? index2 : index1;
1333 index1=index3;
1334 }
1335 assert(index1<=index2);
1336 DLOG(mapping=array_get(&(s->mapping),index1);
1337 assert(mapping->begin<=cluster_num);
1338 assert(index2 >= s->mapping.next ||
1339 ((mapping = array_get(&(s->mapping),index2)) &&
1340 mapping->end>cluster_num)));
1341 }
1342}
1343
1344static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
1345{
1346 int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
1347 mapping_t* mapping;
1348 if(index>=s->mapping.next)
1349 return NULL;
1350 mapping=array_get(&(s->mapping),index);
1351 if(mapping->begin>cluster_num)
1352 return NULL;
1353 assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
1354 return mapping;
1355}
1356
1357static int open_file(BDRVVVFATState* s,mapping_t* mapping)
1358{
1359 if(!mapping)
1360 return -1;
1361 if(!s->current_mapping ||
1362 strcmp(s->current_mapping->path,mapping->path)) {
1363
1364 int fd = qemu_open_old(mapping->path,
1365 O_RDONLY | O_BINARY | O_LARGEFILE);
1366 if(fd<0)
1367 return -1;
1368 vvfat_close_current_file(s);
1369 s->current_fd = fd;
1370 s->current_mapping = mapping;
1371 }
1372 return 0;
1373}
1374
1375static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
1376{
1377 if(s->current_cluster != cluster_num) {
1378 int result=0;
1379 off_t offset;
1380 assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
1381 if(!s->current_mapping
1382 || s->current_mapping->begin>cluster_num
1383 || s->current_mapping->end<=cluster_num) {
1384
1385 mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
1386
1387 assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
1388
1389 if (mapping && mapping->mode & MODE_DIRECTORY) {
1390 vvfat_close_current_file(s);
1391 s->current_mapping = mapping;
1392read_cluster_directory:
1393 offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
1394 s->cluster = (unsigned char*)s->directory.pointer+offset
1395 + 0x20*s->current_mapping->info.dir.first_dir_index;
1396 assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
1397 assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
1398 s->current_cluster = cluster_num;
1399 return 0;
1400 }
1401
1402 if(open_file(s,mapping))
1403 return -2;
1404 } else if (s->current_mapping->mode & MODE_DIRECTORY)
1405 goto read_cluster_directory;
1406
1407 assert(s->current_fd);
1408
1409 offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
1410 if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
1411 return -3;
1412 s->cluster=s->cluster_buffer;
1413 result=read(s->current_fd,s->cluster,s->cluster_size);
1414 if(result<0) {
1415 s->current_cluster = -1;
1416 return -1;
1417 }
1418 s->current_cluster = cluster_num;
1419 }
1420 return 0;
1421}
1422
1423#ifdef DEBUG
1424static void print_direntry(const direntry_t* direntry)
1425{
1426 int j = 0;
1427 char buffer[1024];
1428
1429 fprintf(stderr, "direntry %p: ", direntry);
1430 if(!direntry)
1431 return;
1432 if(is_long_name(direntry)) {
1433 unsigned char* c=(unsigned char*)direntry;
1434 int i;
1435 for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
1436#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;}
1437 ADD_CHAR(c[i]);
1438 for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
1439 ADD_CHAR(c[i]);
1440 for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
1441 ADD_CHAR(c[i]);
1442 buffer[j] = 0;
1443 fprintf(stderr, "%s\n", buffer);
1444 } else {
1445 int i;
1446 for(i=0;i<11;i++)
1447 ADD_CHAR(direntry->name[i]);
1448 buffer[j] = 0;
1449 fprintf(stderr, "%s attributes=0x%02x begin=%u size=%u\n",
1450 buffer,
1451 direntry->attributes,
1452 begin_of_direntry(direntry),le32_to_cpu(direntry->size));
1453 }
1454}
1455
1456static void print_mapping(const mapping_t* mapping)
1457{
1458 fprintf(stderr, "mapping (%p): begin, end = %u, %u, dir_index = %u, "
1459 "first_mapping_index = %d, name = %s, mode = 0x%x, " ,
1460 mapping, mapping->begin, mapping->end, mapping->dir_index,
1461 mapping->first_mapping_index, mapping->path, mapping->mode);
1462
1463 if (mapping->mode & MODE_DIRECTORY)
1464 fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
1465 else
1466 fprintf(stderr, "offset = %u\n", mapping->info.file.offset);
1467}
1468#endif
1469
1470static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
1471 uint8_t *buf, int nb_sectors)
1472{
1473 BDRVVVFATState *s = bs->opaque;
1474 int i;
1475
1476 for(i=0;i<nb_sectors;i++,sector_num++) {
1477 if (sector_num >= bs->total_sectors)
1478 return -1;
1479 if (s->qcow) {
1480 int64_t n;
1481 int ret;
1482 ret = bdrv_is_allocated(s->qcow->bs, sector_num * BDRV_SECTOR_SIZE,
1483 (nb_sectors - i) * BDRV_SECTOR_SIZE, &n);
1484 if (ret < 0) {
1485 return ret;
1486 }
1487 if (ret) {
1488 DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
1489 " allocated\n", sector_num,
1490 n >> BDRV_SECTOR_BITS));
1491 if (bdrv_pread(s->qcow, sector_num * BDRV_SECTOR_SIZE, n,
1492 buf + i * 0x200, 0) < 0) {
1493 return -1;
1494 }
1495 i += (n >> BDRV_SECTOR_BITS) - 1;
1496 sector_num += (n >> BDRV_SECTOR_BITS) - 1;
1497 continue;
1498 }
1499 DLOG(fprintf(stderr, "sector %" PRId64 " not allocated\n",
1500 sector_num));
1501 }
1502 if (sector_num < s->offset_to_root_dir) {
1503 if (sector_num < s->offset_to_fat) {
1504 memcpy(buf + i * 0x200,
1505 &(s->first_sectors[sector_num * 0x200]),
1506 0x200);
1507 } else if (sector_num < s->offset_to_fat + s->sectors_per_fat) {
1508 memcpy(buf + i * 0x200,
1509 &(s->fat.pointer[(sector_num
1510 - s->offset_to_fat) * 0x200]),
1511 0x200);
1512 } else if (sector_num < s->offset_to_root_dir) {
1513 memcpy(buf + i * 0x200,
1514 &(s->fat.pointer[(sector_num - s->offset_to_fat
1515 - s->sectors_per_fat) * 0x200]),
1516 0x200);
1517 }
1518 } else {
1519 uint32_t sector = sector_num - s->offset_to_root_dir,
1520 sector_offset_in_cluster=(sector%s->sectors_per_cluster),
1521 cluster_num=sector/s->sectors_per_cluster;
1522 if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
1523
1524 memset(buf+i*0x200,0,0x200);
1525 continue;
1526 }
1527 memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
1528 }
1529 }
1530 return 0;
1531}
1532
1533static int coroutine_fn
1534vvfat_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
1535 QEMUIOVector *qiov, BdrvRequestFlags flags)
1536{
1537 int ret;
1538 BDRVVVFATState *s = bs->opaque;
1539 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
1540 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
1541 void *buf;
1542
1543 assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
1544 assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
1545
1546 buf = g_try_malloc(bytes);
1547 if (bytes && buf == NULL) {
1548 return -ENOMEM;
1549 }
1550
1551 qemu_co_mutex_lock(&s->lock);
1552 ret = vvfat_read(bs, sector_num, buf, nb_sectors);
1553 qemu_co_mutex_unlock(&s->lock);
1554
1555 qemu_iovec_from_buf(qiov, 0, buf, bytes);
1556 g_free(buf);
1557
1558 return ret;
1559}
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583typedef struct commit_t {
1584 char* path;
1585 union {
1586 struct { uint32_t cluster; } rename;
1587 struct { int dir_index; uint32_t modified_offset; } writeout;
1588 struct { uint32_t first_cluster; } new_file;
1589 struct { uint32_t cluster; } mkdir;
1590 } param;
1591
1592 enum {
1593 ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
1594 } action;
1595} commit_t;
1596
1597static void clear_commits(BDRVVVFATState* s)
1598{
1599 int i;
1600DLOG(fprintf(stderr, "clear_commits (%u commits)\n", s->commits.next));
1601 for (i = 0; i < s->commits.next; i++) {
1602 commit_t* commit = array_get(&(s->commits), i);
1603 assert(commit->path || commit->action == ACTION_WRITEOUT);
1604 if (commit->action != ACTION_WRITEOUT) {
1605 assert(commit->path);
1606 g_free(commit->path);
1607 } else
1608 assert(commit->path == NULL);
1609 }
1610 s->commits.next = 0;
1611}
1612
1613static void schedule_rename(BDRVVVFATState* s,
1614 uint32_t cluster, char* new_path)
1615{
1616 commit_t* commit = array_get_next(&(s->commits));
1617 commit->path = new_path;
1618 commit->param.rename.cluster = cluster;
1619 commit->action = ACTION_RENAME;
1620}
1621
1622static void schedule_writeout(BDRVVVFATState* s,
1623 int dir_index, uint32_t modified_offset)
1624{
1625 commit_t* commit = array_get_next(&(s->commits));
1626 commit->path = NULL;
1627 commit->param.writeout.dir_index = dir_index;
1628 commit->param.writeout.modified_offset = modified_offset;
1629 commit->action = ACTION_WRITEOUT;
1630}
1631
1632static void schedule_new_file(BDRVVVFATState* s,
1633 char* path, uint32_t first_cluster)
1634{
1635 commit_t* commit = array_get_next(&(s->commits));
1636 commit->path = path;
1637 commit->param.new_file.first_cluster = first_cluster;
1638 commit->action = ACTION_NEW_FILE;
1639}
1640
1641static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
1642{
1643 commit_t* commit = array_get_next(&(s->commits));
1644 commit->path = path;
1645 commit->param.mkdir.cluster = cluster;
1646 commit->action = ACTION_MKDIR;
1647}
1648
1649typedef struct {
1650
1651
1652
1653
1654
1655 unsigned char name[0x3f * 13 + 1];
1656 gunichar2 name2[0x3f * 13 + 1];
1657 int checksum, len;
1658 int sequence_number;
1659} long_file_name;
1660
1661static void lfn_init(long_file_name* lfn)
1662{
1663 lfn->sequence_number = lfn->len = 0;
1664 lfn->checksum = 0x100;
1665}
1666
1667
1668static int parse_long_name(long_file_name* lfn,
1669 const direntry_t* direntry)
1670{
1671 int i, j, offset;
1672 const unsigned char* pointer = (const unsigned char*)direntry;
1673
1674 if (!is_long_name(direntry))
1675 return 1;
1676
1677 if (pointer[0] & 0x40) {
1678
1679 lfn->sequence_number = pointer[0] & 0x3f;
1680 lfn->checksum = pointer[13];
1681 lfn->name[0] = 0;
1682 lfn->name[lfn->sequence_number * 13] = 0;
1683 } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) {
1684
1685 return -1;
1686 } else if (pointer[13] != lfn->checksum) {
1687
1688 return -2;
1689 } else if (pointer[12] || pointer[26] || pointer[27]) {
1690
1691 return -3;
1692 }
1693
1694 offset = 13 * (lfn->sequence_number - 1);
1695 for (i = 0, j = 1; i < 13; i++, j+=2) {
1696 if (j == 11)
1697 j = 14;
1698 else if (j == 26)
1699 j = 28;
1700
1701 if (pointer[j] == 0 && pointer[j + 1] == 0) {
1702
1703 break;
1704 }
1705 gunichar2 c = (pointer[j + 1] << 8) + pointer[j];
1706 lfn->name2[offset + i] = c;
1707 }
1708
1709 if (pointer[0] & 0x40) {
1710
1711 lfn->len = offset + i;
1712 }
1713 if ((pointer[0] & 0x3f) == 0x01) {
1714
1715 glong olen;
1716 gchar *utf8 = g_utf16_to_utf8(lfn->name2, lfn->len, NULL, &olen, NULL);
1717 if (!utf8) {
1718 return -4;
1719 }
1720 lfn->len = olen;
1721 memcpy(lfn->name, utf8, olen + 1);
1722 g_free(utf8);
1723 }
1724
1725 return 0;
1726}
1727
1728
1729static int parse_short_name(BDRVVVFATState* s,
1730 long_file_name* lfn, direntry_t* direntry)
1731{
1732 int i, j;
1733
1734 if (!is_short_name(direntry))
1735 return 1;
1736
1737 for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
1738 for (i = 0; i <= j; i++) {
1739 uint8_t c = direntry->name[i];
1740 if (c != to_valid_short_char(c)) {
1741 return -1;
1742 } else if (s->downcase_short_names) {
1743 lfn->name[i] = qemu_tolower(direntry->name[i]);
1744 } else {
1745 lfn->name[i] = direntry->name[i];
1746 }
1747 }
1748
1749 for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) {
1750 }
1751 if (j >= 0) {
1752 lfn->name[i++] = '.';
1753 lfn->name[i + j + 1] = '\0';
1754 for (;j >= 0; j--) {
1755 uint8_t c = direntry->name[8 + j];
1756 if (c != to_valid_short_char(c)) {
1757 return -2;
1758 } else if (s->downcase_short_names) {
1759 lfn->name[i + j] = qemu_tolower(c);
1760 } else {
1761 lfn->name[i + j] = c;
1762 }
1763 }
1764 } else
1765 lfn->name[i + j + 1] = '\0';
1766
1767 if (lfn->name[0] == DIR_KANJI_FAKE) {
1768 lfn->name[0] = DIR_KANJI;
1769 }
1770 lfn->len = strlen((char*)lfn->name);
1771
1772 return 0;
1773}
1774
1775static inline uint32_t modified_fat_get(BDRVVVFATState* s,
1776 unsigned int cluster)
1777{
1778 if (cluster < s->last_cluster_of_root_directory) {
1779 if (cluster + 1 == s->last_cluster_of_root_directory)
1780 return s->max_fat_value;
1781 else
1782 return cluster + 1;
1783 }
1784
1785 if (s->fat_type==32) {
1786 uint32_t* entry=((uint32_t*)s->fat2)+cluster;
1787 return le32_to_cpu(*entry);
1788 } else if (s->fat_type==16) {
1789 uint16_t* entry=((uint16_t*)s->fat2)+cluster;
1790 return le16_to_cpu(*entry);
1791 } else {
1792 const uint8_t* x=s->fat2+cluster*3/2;
1793 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
1794 }
1795}
1796
1797static inline bool cluster_was_modified(BDRVVVFATState *s,
1798 uint32_t cluster_num)
1799{
1800 int was_modified = 0;
1801 int i;
1802
1803 if (s->qcow == NULL) {
1804 return 0;
1805 }
1806
1807 for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
1808 was_modified = bdrv_is_allocated(s->qcow->bs,
1809 (cluster2sector(s, cluster_num) +
1810 i) * BDRV_SECTOR_SIZE,
1811 BDRV_SECTOR_SIZE, NULL);
1812 }
1813
1814
1815
1816
1817
1818
1819
1820 return !!was_modified;
1821}
1822
1823static const char* get_basename(const char* path)
1824{
1825 char* basename = strrchr(path, '/');
1826 if (basename == NULL)
1827 return path;
1828 else
1829 return basename + 1;
1830}
1831
1832
1833
1834
1835
1836
1837
1838
1839typedef enum {
1840 USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
1841} used_t;
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
1854 direntry_t* direntry, const char* path)
1855{
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873 int copy_it = 0;
1874 int was_modified = 0;
1875 int32_t ret = 0;
1876
1877 uint32_t cluster_num = begin_of_direntry(direntry);
1878 uint32_t offset = 0;
1879 int first_mapping_index = -1;
1880 mapping_t* mapping = NULL;
1881 const char* basename2 = NULL;
1882
1883 vvfat_close_current_file(s);
1884
1885
1886 if (cluster_num == 0)
1887 return 0;
1888
1889
1890 if (s->qcow) {
1891 basename2 = get_basename(path);
1892
1893 mapping = find_mapping_for_cluster(s, cluster_num);
1894
1895 if (mapping) {
1896 const char* basename;
1897
1898 assert(mapping->mode & MODE_DELETED);
1899 mapping->mode &= ~MODE_DELETED;
1900
1901 basename = get_basename(mapping->path);
1902
1903 assert(mapping->mode & MODE_NORMAL);
1904
1905
1906 if (strcmp(basename, basename2))
1907 schedule_rename(s, cluster_num, g_strdup(path));
1908 } else if (is_file(direntry))
1909
1910 schedule_new_file(s, g_strdup(path), cluster_num);
1911 else {
1912 abort();
1913 return 0;
1914 }
1915 }
1916
1917 while(1) {
1918 if (s->qcow) {
1919 if (!copy_it && cluster_was_modified(s, cluster_num)) {
1920 if (mapping == NULL ||
1921 mapping->begin > cluster_num ||
1922 mapping->end <= cluster_num)
1923 mapping = find_mapping_for_cluster(s, cluster_num);
1924
1925
1926 if (mapping &&
1927 (mapping->mode & MODE_DIRECTORY) == 0) {
1928
1929
1930 if (offset != mapping->info.file.offset + s->cluster_size
1931 * (cluster_num - mapping->begin)) {
1932
1933 abort();
1934 copy_it = 1;
1935 } else if (offset == 0) {
1936 const char* basename = get_basename(mapping->path);
1937
1938 if (strcmp(basename, basename2))
1939 copy_it = 1;
1940 first_mapping_index = array_index(&(s->mapping), mapping);
1941 }
1942
1943 if (mapping->first_mapping_index != first_mapping_index
1944 && mapping->info.file.offset > 0) {
1945 abort();
1946 copy_it = 1;
1947 }
1948
1949
1950 if (!was_modified && is_file(direntry)) {
1951 was_modified = 1;
1952 schedule_writeout(s, mapping->dir_index, offset);
1953 }
1954 }
1955 }
1956
1957 if (copy_it) {
1958 int i;
1959
1960
1961
1962
1963 int64_t offset = cluster2sector(s, cluster_num);
1964
1965 vvfat_close_current_file(s);
1966 for (i = 0; i < s->sectors_per_cluster; i++) {
1967 int res;
1968
1969 res = bdrv_is_allocated(s->qcow->bs,
1970 (offset + i) * BDRV_SECTOR_SIZE,
1971 BDRV_SECTOR_SIZE, NULL);
1972 if (res < 0) {
1973 return -1;
1974 }
1975 if (!res) {
1976 res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
1977 if (res) {
1978 return -1;
1979 }
1980 res = bdrv_pwrite(s->qcow, offset * BDRV_SECTOR_SIZE,
1981 BDRV_SECTOR_SIZE, s->cluster_buffer,
1982 0);
1983 if (res < 0) {
1984 return -2;
1985 }
1986 }
1987 }
1988 }
1989 }
1990
1991 ret++;
1992 if (s->used_clusters[cluster_num] & USED_ANY)
1993 return 0;
1994 s->used_clusters[cluster_num] = USED_FILE;
1995
1996 cluster_num = modified_fat_get(s, cluster_num);
1997
1998 if (fat_eof(s, cluster_num))
1999 return ret;
2000 else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
2001 return -1;
2002
2003 offset += s->cluster_size;
2004 }
2005}
2006
2007
2008
2009
2010
2011
2012static int check_directory_consistency(BDRVVVFATState *s,
2013 int cluster_num, const char* path)
2014{
2015 int ret = 0;
2016 unsigned char* cluster = g_malloc(s->cluster_size);
2017 direntry_t* direntries = (direntry_t*)cluster;
2018 mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
2019
2020 long_file_name lfn;
2021 int path_len = strlen(path);
2022 char path2[PATH_MAX + 1];
2023
2024 assert(path_len < PATH_MAX);
2025 pstrcpy(path2, sizeof(path2), path);
2026 path2[path_len] = '/';
2027 path2[path_len + 1] = '\0';
2028
2029 if (mapping) {
2030 const char* basename = get_basename(mapping->path);
2031 const char* basename2 = get_basename(path);
2032
2033 assert(mapping->mode & MODE_DIRECTORY);
2034
2035 assert(mapping->mode & MODE_DELETED);
2036 mapping->mode &= ~MODE_DELETED;
2037
2038 if (strcmp(basename, basename2))
2039 schedule_rename(s, cluster_num, g_strdup(path));
2040 } else
2041
2042 schedule_mkdir(s, cluster_num, g_strdup(path));
2043
2044 lfn_init(&lfn);
2045 do {
2046 int i;
2047 int subret = 0;
2048
2049 ret++;
2050
2051 if (s->used_clusters[cluster_num] & USED_ANY) {
2052 fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
2053 goto fail;
2054 }
2055 s->used_clusters[cluster_num] = USED_DIRECTORY;
2056
2057DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
2058 subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
2059 s->sectors_per_cluster);
2060 if (subret) {
2061 fprintf(stderr, "Error fetching direntries\n");
2062 fail:
2063 g_free(cluster);
2064 return 0;
2065 }
2066
2067 for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
2068 int cluster_count = 0;
2069
2070DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
2071 if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
2072 is_free(direntries + i))
2073 continue;
2074
2075 subret = parse_long_name(&lfn, direntries + i);
2076 if (subret < 0) {
2077 fprintf(stderr, "Error in long name\n");
2078 goto fail;
2079 }
2080 if (subret == 0 || is_free(direntries + i))
2081 continue;
2082
2083 if (fat_chksum(direntries+i) != lfn.checksum) {
2084 subret = parse_short_name(s, &lfn, direntries + i);
2085 if (subret < 0) {
2086 fprintf(stderr, "Error in short name (%d)\n", subret);
2087 goto fail;
2088 }
2089 if (subret > 0 || !strcmp((char*)lfn.name, ".")
2090 || !strcmp((char*)lfn.name, ".."))
2091 continue;
2092 }
2093 lfn.checksum = 0x100;
2094
2095 if (!valid_filename(lfn.name)) {
2096 fprintf(stderr, "Invalid file name\n");
2097 goto fail;
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_old(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 (%u, %d)\n", i,
2662 commit->path ? commit->path : "(null)",
2663 commit->param.rename.cluster, commit->action);
2664 }
2665#endif
2666
2667 for (i = 0; i < s->commits.next;) {
2668 commit_t* commit = array_get(&(s->commits), i);
2669 if (commit->action == ACTION_RENAME) {
2670 mapping_t* mapping = find_mapping_for_cluster(s,
2671 commit->param.rename.cluster);
2672 char *old_path;
2673
2674 if (mapping == NULL) {
2675 return -1;
2676 }
2677 old_path = mapping->path;
2678 assert(commit->path);
2679 mapping->path = commit->path;
2680 if (rename(old_path, mapping->path))
2681 return -2;
2682
2683 if (mapping->mode & MODE_DIRECTORY) {
2684 int l1 = strlen(mapping->path);
2685 int l2 = strlen(old_path);
2686 int diff = l1 - l2;
2687 direntry_t* direntry = array_get(&(s->directory),
2688 mapping->info.dir.first_dir_index);
2689 uint32_t c = mapping->begin;
2690 int i = 0;
2691
2692
2693 while (!fat_eof(s, c)) {
2694 do {
2695 direntry_t* d = direntry + i;
2696
2697 if (is_file(d) || (is_directory(d) && !is_dot(d))) {
2698 int l;
2699 char *new_path;
2700 mapping_t* m = find_mapping_for_cluster(s,
2701 begin_of_direntry(d));
2702 if (m == NULL) {
2703 return -1;
2704 }
2705 l = strlen(m->path);
2706 new_path = g_malloc(l + diff + 1);
2707
2708 assert(!strncmp(m->path, mapping->path, l2));
2709
2710 pstrcpy(new_path, l + diff + 1, mapping->path);
2711 pstrcpy(new_path + l1, l + diff + 1 - l1,
2712 m->path + l2);
2713
2714 schedule_rename(s, m->begin, new_path);
2715 }
2716 i++;
2717 } while((i % (0x10 * s->sectors_per_cluster)) != 0);
2718 c = fat_get(s, c);
2719 }
2720 }
2721
2722 g_free(old_path);
2723 array_remove(&(s->commits), i);
2724 continue;
2725 } else if (commit->action == ACTION_MKDIR) {
2726 mapping_t* mapping;
2727 int j, parent_path_len;
2728
2729#ifdef __MINGW32__
2730 if (mkdir(commit->path))
2731 return -5;
2732#else
2733 if (mkdir(commit->path, 0755))
2734 return -5;
2735#endif
2736
2737 mapping = insert_mapping(s, commit->param.mkdir.cluster,
2738 commit->param.mkdir.cluster + 1);
2739 if (mapping == NULL)
2740 return -6;
2741
2742 mapping->mode = MODE_DIRECTORY;
2743 mapping->read_only = 0;
2744 mapping->path = commit->path;
2745 j = s->directory.next;
2746 assert(j);
2747 insert_direntries(s, s->directory.next,
2748 0x10 * s->sectors_per_cluster);
2749 mapping->info.dir.first_dir_index = j;
2750
2751 parent_path_len = strlen(commit->path)
2752 - strlen(get_basename(commit->path)) - 1;
2753 for (j = 0; j < s->mapping.next; j++) {
2754 mapping_t* m = array_get(&(s->mapping), j);
2755 if (m->first_mapping_index < 0 && m != mapping &&
2756 !strncmp(m->path, mapping->path, parent_path_len) &&
2757 strlen(m->path) == parent_path_len)
2758 break;
2759 }
2760 assert(j < s->mapping.next);
2761 mapping->info.dir.parent_mapping_index = j;
2762
2763 array_remove(&(s->commits), i);
2764 continue;
2765 }
2766
2767 i++;
2768 }
2769 return 0;
2770}
2771
2772
2773
2774
2775static int handle_commits(BDRVVVFATState* s)
2776{
2777 int i, fail = 0;
2778
2779 vvfat_close_current_file(s);
2780
2781 for (i = 0; !fail && i < s->commits.next; i++) {
2782 commit_t* commit = array_get(&(s->commits), i);
2783 switch(commit->action) {
2784 case ACTION_RENAME: case ACTION_MKDIR:
2785 abort();
2786 fail = -2;
2787 break;
2788 case ACTION_WRITEOUT: {
2789#ifndef NDEBUG
2790
2791 direntry_t* entry = array_get(&(s->directory),
2792 commit->param.writeout.dir_index);
2793 uint32_t begin = begin_of_direntry(entry);
2794 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2795#endif
2796
2797 assert(mapping);
2798 assert(mapping->begin == begin);
2799 assert(commit->path == NULL);
2800
2801 if (commit_one_file(s, commit->param.writeout.dir_index,
2802 commit->param.writeout.modified_offset))
2803 fail = -3;
2804
2805 break;
2806 }
2807 case ACTION_NEW_FILE: {
2808 int begin = commit->param.new_file.first_cluster;
2809 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2810 direntry_t* entry;
2811 int i;
2812
2813
2814 for (i = 0; i < s->directory.next; i++) {
2815 entry = array_get(&(s->directory), i);
2816 if (is_file(entry) && begin_of_direntry(entry) == begin)
2817 break;
2818 }
2819
2820 if (i >= s->directory.next) {
2821 fail = -6;
2822 continue;
2823 }
2824
2825
2826 if (mapping && mapping->begin != begin) {
2827 mapping->end = begin;
2828 mapping = NULL;
2829 }
2830 if (mapping == NULL) {
2831 mapping = insert_mapping(s, begin, begin+1);
2832 }
2833
2834 assert(commit->path);
2835 mapping->path = commit->path;
2836 mapping->read_only = 0;
2837 mapping->mode = MODE_NORMAL;
2838 mapping->info.file.offset = 0;
2839
2840 if (commit_one_file(s, i, 0))
2841 fail = -7;
2842
2843 break;
2844 }
2845 default:
2846 abort();
2847 }
2848 }
2849 if (i > 0 && array_remove_slice(&(s->commits), 0, i))
2850 return -1;
2851 return fail;
2852}
2853
2854static int handle_deletes(BDRVVVFATState* s)
2855{
2856 int i, deferred = 1, deleted = 1;
2857
2858
2859
2860 while (deferred && deleted) {
2861 deferred = 0;
2862 deleted = 0;
2863
2864 for (i = 1; i < s->mapping.next; i++) {
2865 mapping_t* mapping = array_get(&(s->mapping), i);
2866 if (mapping->mode & MODE_DELETED) {
2867 direntry_t* entry = array_get(&(s->directory),
2868 mapping->dir_index);
2869
2870 if (is_free(entry)) {
2871
2872 if (mapping->mode & MODE_DIRECTORY) {
2873 int j, next_dir_index = s->directory.next,
2874 first_dir_index = mapping->info.dir.first_dir_index;
2875
2876 if (rmdir(mapping->path) < 0) {
2877 if (errno == ENOTEMPTY) {
2878 deferred++;
2879 continue;
2880 } else
2881 return -5;
2882 }
2883
2884 for (j = 1; j < s->mapping.next; j++) {
2885 mapping_t* m = array_get(&(s->mapping), j);
2886 if (m->mode & MODE_DIRECTORY &&
2887 m->info.dir.first_dir_index >
2888 first_dir_index &&
2889 m->info.dir.first_dir_index <
2890 next_dir_index)
2891 next_dir_index =
2892 m->info.dir.first_dir_index;
2893 }
2894 remove_direntries(s, first_dir_index,
2895 next_dir_index - first_dir_index);
2896
2897 deleted++;
2898 }
2899 } else {
2900 if (unlink(mapping->path))
2901 return -4;
2902 deleted++;
2903 }
2904 DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
2905 remove_mapping(s, i);
2906 }
2907 }
2908 }
2909
2910 return 0;
2911}
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921static int do_commit(BDRVVVFATState* s)
2922{
2923 int ret = 0;
2924
2925
2926 if (s->commits.next == 0)
2927 return 0;
2928
2929 vvfat_close_current_file(s);
2930
2931 ret = handle_renames_and_mkdirs(s);
2932 if (ret) {
2933 fprintf(stderr, "Error handling renames (%d)\n", ret);
2934 abort();
2935 return ret;
2936 }
2937
2938
2939 memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
2940
2941
2942 ret = commit_direntries(s, 0, -1);
2943 if (ret) {
2944 fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
2945 abort();
2946 return ret;
2947 }
2948
2949 ret = handle_commits(s);
2950 if (ret) {
2951 fprintf(stderr, "Error handling commits (%d)\n", ret);
2952 abort();
2953 return ret;
2954 }
2955
2956 ret = handle_deletes(s);
2957 if (ret) {
2958 fprintf(stderr, "Error deleting\n");
2959 abort();
2960 return ret;
2961 }
2962
2963 bdrv_make_empty(s->qcow, NULL);
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 int first_cluster, last_cluster;
2986
2987DLOG(checkpoint());
2988
2989
2990 if (s->qcow == NULL) {
2991 return -EACCES;
2992 }
2993
2994 vvfat_close_current_file(s);
2995
2996
2997
2998
2999
3000
3001 if (sector_num < s->offset_to_fat)
3002 return -1;
3003
3004
3005
3006
3007
3008 first_cluster = sector2cluster(s, sector_num);
3009 last_cluster = sector2cluster(s, sector_num + nb_sectors - 1);
3010
3011 for (i = first_cluster; i <= last_cluster;) {
3012 mapping_t *mapping = NULL;
3013
3014 if (i >= 0) {
3015 mapping = find_mapping_for_cluster(s, i);
3016 }
3017
3018 if (mapping) {
3019 if (mapping->read_only) {
3020 fprintf(stderr, "Tried to write to write-protected file %s\n",
3021 mapping->path);
3022 return -1;
3023 }
3024
3025 if (mapping->mode & MODE_DIRECTORY) {
3026 int begin = cluster2sector(s, i);
3027 int end = begin + s->sectors_per_cluster, k;
3028 int dir_index;
3029 const direntry_t* direntries;
3030 long_file_name lfn;
3031
3032 lfn_init(&lfn);
3033
3034 if (begin < sector_num)
3035 begin = sector_num;
3036 if (end > sector_num + nb_sectors)
3037 end = sector_num + nb_sectors;
3038 dir_index = mapping->dir_index +
3039 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
3040 direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
3041
3042 for (k = 0; k < (end - begin) * 0x10; k++) {
3043
3044 if (is_short_name(direntries + k) &&
3045 (direntries[k].attributes & 1)) {
3046 if (memcmp(direntries + k,
3047 array_get(&(s->directory), dir_index + k),
3048 sizeof(direntry_t))) {
3049 warn_report("tried to write to write-protected "
3050 "file");
3051 return -1;
3052 }
3053 }
3054 }
3055 }
3056 i = mapping->end;
3057 } else {
3058 i++;
3059 }
3060 }
3061
3062
3063
3064
3065DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
3066 ret = bdrv_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE,
3067 nb_sectors * BDRV_SECTOR_SIZE, buf, 0);
3068 if (ret < 0) {
3069 fprintf(stderr, "Error writing to qcow backend\n");
3070 return ret;
3071 }
3072
3073 for (i = first_cluster; i <= last_cluster; i++) {
3074 if (i >= 0) {
3075 s->used_clusters[i] |= USED_ALLOCATED;
3076 }
3077 }
3078
3079DLOG(checkpoint());
3080
3081 try_commit(s);
3082
3083DLOG(checkpoint());
3084 return 0;
3085}
3086
3087static int coroutine_fn
3088vvfat_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
3089 QEMUIOVector *qiov, BdrvRequestFlags flags)
3090{
3091 int ret;
3092 BDRVVVFATState *s = bs->opaque;
3093 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
3094 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
3095 void *buf;
3096
3097 assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
3098 assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
3099
3100 buf = g_try_malloc(bytes);
3101 if (bytes && buf == NULL) {
3102 return -ENOMEM;
3103 }
3104 qemu_iovec_to_buf(qiov, 0, buf, bytes);
3105
3106 qemu_co_mutex_lock(&s->lock);
3107 ret = vvfat_write(bs, sector_num, buf, nb_sectors);
3108 qemu_co_mutex_unlock(&s->lock);
3109
3110 g_free(buf);
3111
3112 return ret;
3113}
3114
3115static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs,
3116 bool want_zero, int64_t offset,
3117 int64_t bytes, int64_t *n,
3118 int64_t *map,
3119 BlockDriverState **file)
3120{
3121 *n = bytes;
3122 return BDRV_BLOCK_DATA;
3123}
3124
3125static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format,
3126 int *child_flags, QDict *child_options,
3127 int parent_flags, QDict *parent_options)
3128{
3129 qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
3130 qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off");
3131 qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on");
3132}
3133
3134static BdrvChildClass child_vvfat_qcow;
3135
3136static int enable_write_target(BlockDriverState *bs, Error **errp)
3137{
3138 BDRVVVFATState *s = bs->opaque;
3139 BlockDriver *bdrv_qcow = NULL;
3140 QemuOpts *opts = NULL;
3141 int ret;
3142 int size = sector2cluster(s, s->sector_count);
3143 QDict *options;
3144
3145 s->used_clusters = g_malloc0(size);
3146
3147 array_init(&(s->commits), sizeof(commit_t));
3148
3149 s->qcow_filename = g_malloc(PATH_MAX);
3150 ret = get_tmp_filename(s->qcow_filename, PATH_MAX);
3151 if (ret < 0) {
3152 error_setg_errno(errp, -ret, "can't create temporary file");
3153 goto err;
3154 }
3155
3156 bdrv_qcow = bdrv_find_format("qcow");
3157 if (!bdrv_qcow) {
3158 error_setg(errp, "Failed to locate qcow driver");
3159 ret = -ENOENT;
3160 goto err;
3161 }
3162
3163 opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
3164 qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
3165 bs->total_sectors * BDRV_SECTOR_SIZE, &error_abort);
3166 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
3167
3168 ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
3169 qemu_opts_del(opts);
3170 if (ret < 0) {
3171 goto err;
3172 }
3173
3174 options = qdict_new();
3175 qdict_put_str(options, "write-target.driver", "qcow");
3176 s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
3177 &child_vvfat_qcow,
3178 BDRV_CHILD_DATA | BDRV_CHILD_METADATA,
3179 false, errp);
3180 qobject_unref(options);
3181 if (!s->qcow) {
3182 ret = -EINVAL;
3183 goto err;
3184 }
3185
3186#ifndef _WIN32
3187 unlink(s->qcow_filename);
3188#endif
3189
3190 return 0;
3191
3192err:
3193 return ret;
3194}
3195
3196static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
3197 BdrvChildRole role,
3198 BlockReopenQueue *reopen_queue,
3199 uint64_t perm, uint64_t shared,
3200 uint64_t *nperm, uint64_t *nshared)
3201{
3202 assert(role & BDRV_CHILD_DATA);
3203
3204 *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
3205 *nshared = BLK_PERM_WRITE_UNCHANGED;
3206}
3207
3208static void vvfat_close(BlockDriverState *bs)
3209{
3210 BDRVVVFATState *s = bs->opaque;
3211
3212 vvfat_close_current_file(s);
3213 array_free(&(s->fat));
3214 array_free(&(s->directory));
3215 array_free(&(s->mapping));
3216 g_free(s->cluster_buffer);
3217
3218 if (s->qcow) {
3219 migrate_del_blocker(s->migration_blocker);
3220 error_free(s->migration_blocker);
3221 }
3222}
3223
3224static const char *const vvfat_strong_runtime_opts[] = {
3225 "dir",
3226 "fat-type",
3227 "floppy",
3228 "label",
3229 "rw",
3230
3231 NULL
3232};
3233
3234static BlockDriver bdrv_vvfat = {
3235 .format_name = "vvfat",
3236 .protocol_name = "fat",
3237 .instance_size = sizeof(BDRVVVFATState),
3238
3239 .bdrv_parse_filename = vvfat_parse_filename,
3240 .bdrv_file_open = vvfat_open,
3241 .bdrv_refresh_limits = vvfat_refresh_limits,
3242 .bdrv_close = vvfat_close,
3243 .bdrv_child_perm = vvfat_child_perm,
3244
3245 .bdrv_co_preadv = vvfat_co_preadv,
3246 .bdrv_co_pwritev = vvfat_co_pwritev,
3247 .bdrv_co_block_status = vvfat_co_block_status,
3248
3249 .strong_runtime_opts = vvfat_strong_runtime_opts,
3250};
3251
3252static void bdrv_vvfat_init(void)
3253{
3254 child_vvfat_qcow = child_of_bds;
3255 child_vvfat_qcow.inherit_options = vvfat_qcow_options;
3256 bdrv_register(&bdrv_vvfat);
3257}
3258
3259block_init(bdrv_vvfat_init);
3260
3261#ifdef DEBUG
3262static void checkpoint(void)
3263{
3264 assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
3265 check1(vvv);
3266 check2(vvv);
3267 assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
3268}
3269#endif
3270