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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 uint32_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
1234 if (qemu_opt_get_bool(opts, "rw", false)) {
1235 if (!bdrv_is_read_only(bs)) {
1236 ret = enable_write_target(bs, errp);
1237 if (ret < 0) {
1238 goto fail;
1239 }
1240 } else {
1241 ret = -EPERM;
1242 error_setg(errp,
1243 "Unable to set VVFAT to 'rw' when drive is read-only");
1244 goto fail;
1245 }
1246 } else {
1247 ret = bdrv_apply_auto_read_only(bs, NULL, errp);
1248 if (ret < 0) {
1249 goto fail;
1250 }
1251 }
1252
1253 bs->total_sectors = cyls * heads * secs;
1254
1255 if (init_directories(s, dirname, heads, secs, errp)) {
1256 ret = -EIO;
1257 goto fail;
1258 }
1259
1260 s->sector_count = s->offset_to_root_dir
1261 + s->sectors_per_cluster * s->cluster_count;
1262
1263
1264 if (s->qcow) {
1265 error_setg(&s->migration_blocker,
1266 "The vvfat (rw) format used by node '%s' "
1267 "does not support live migration",
1268 bdrv_get_device_or_node_name(bs));
1269 ret = migrate_add_blocker(s->migration_blocker, errp);
1270 if (ret < 0) {
1271 error_free(s->migration_blocker);
1272 goto fail;
1273 }
1274 }
1275
1276 if (s->offset_to_bootsector > 0) {
1277 init_mbr(s, cyls, heads, secs);
1278 }
1279
1280 qemu_co_mutex_init(&s->lock);
1281
1282 qemu_opts_del(opts);
1283
1284 return 0;
1285
1286fail:
1287 g_free(s->qcow_filename);
1288 s->qcow_filename = NULL;
1289 g_free(s->cluster_buffer);
1290 s->cluster_buffer = NULL;
1291 g_free(s->used_clusters);
1292 s->used_clusters = NULL;
1293
1294 qemu_opts_del(opts);
1295 return ret;
1296}
1297
1298static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
1299{
1300 bs->bl.request_alignment = BDRV_SECTOR_SIZE;
1301}
1302
1303static inline void vvfat_close_current_file(BDRVVVFATState *s)
1304{
1305 if(s->current_mapping) {
1306 s->current_mapping = NULL;
1307 if (s->current_fd) {
1308 qemu_close(s->current_fd);
1309 s->current_fd = 0;
1310 }
1311 }
1312 s->current_cluster = -1;
1313}
1314
1315
1316
1317
1318static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
1319{
1320 while(1) {
1321 int index3;
1322 mapping_t* mapping;
1323 index3=(index1+index2)/2;
1324 mapping=array_get(&(s->mapping),index3);
1325 assert(mapping->begin < mapping->end);
1326 if(mapping->begin>=cluster_num) {
1327 assert(index2!=index3 || index2==0);
1328 if(index2==index3)
1329 return index1;
1330 index2=index3;
1331 } else {
1332 if(index1==index3)
1333 return mapping->end<=cluster_num ? index2 : index1;
1334 index1=index3;
1335 }
1336 assert(index1<=index2);
1337 DLOG(mapping=array_get(&(s->mapping),index1);
1338 assert(mapping->begin<=cluster_num);
1339 assert(index2 >= s->mapping.next ||
1340 ((mapping = array_get(&(s->mapping),index2)) &&
1341 mapping->end>cluster_num)));
1342 }
1343}
1344
1345static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
1346{
1347 int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
1348 mapping_t* mapping;
1349 if(index>=s->mapping.next)
1350 return NULL;
1351 mapping=array_get(&(s->mapping),index);
1352 if(mapping->begin>cluster_num)
1353 return NULL;
1354 assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
1355 return mapping;
1356}
1357
1358static int open_file(BDRVVVFATState* s,mapping_t* mapping)
1359{
1360 if(!mapping)
1361 return -1;
1362 if(!s->current_mapping ||
1363 strcmp(s->current_mapping->path,mapping->path)) {
1364
1365 int fd = qemu_open_old(mapping->path,
1366 O_RDONLY | O_BINARY | O_LARGEFILE);
1367 if(fd<0)
1368 return -1;
1369 vvfat_close_current_file(s);
1370 s->current_fd = fd;
1371 s->current_mapping = mapping;
1372 }
1373 return 0;
1374}
1375
1376static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
1377{
1378 if(s->current_cluster != cluster_num) {
1379 int result=0;
1380 off_t offset;
1381 assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
1382 if(!s->current_mapping
1383 || s->current_mapping->begin>cluster_num
1384 || s->current_mapping->end<=cluster_num) {
1385
1386 mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
1387
1388 assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
1389
1390 if (mapping && mapping->mode & MODE_DIRECTORY) {
1391 vvfat_close_current_file(s);
1392 s->current_mapping = mapping;
1393read_cluster_directory:
1394 offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
1395 s->cluster = (unsigned char*)s->directory.pointer+offset
1396 + 0x20*s->current_mapping->info.dir.first_dir_index;
1397 assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
1398 assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
1399 s->current_cluster = cluster_num;
1400 return 0;
1401 }
1402
1403 if(open_file(s,mapping))
1404 return -2;
1405 } else if (s->current_mapping->mode & MODE_DIRECTORY)
1406 goto read_cluster_directory;
1407
1408 assert(s->current_fd);
1409
1410 offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
1411 if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
1412 return -3;
1413 s->cluster=s->cluster_buffer;
1414 result=read(s->current_fd,s->cluster,s->cluster_size);
1415 if(result<0) {
1416 s->current_cluster = -1;
1417 return -1;
1418 }
1419 s->current_cluster = cluster_num;
1420 }
1421 return 0;
1422}
1423
1424#ifdef DEBUG
1425static void print_direntry(const direntry_t* direntry)
1426{
1427 int j = 0;
1428 char buffer[1024];
1429
1430 fprintf(stderr, "direntry %p: ", direntry);
1431 if(!direntry)
1432 return;
1433 if(is_long_name(direntry)) {
1434 unsigned char* c=(unsigned char*)direntry;
1435 int i;
1436 for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
1437#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;}
1438 ADD_CHAR(c[i]);
1439 for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
1440 ADD_CHAR(c[i]);
1441 for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
1442 ADD_CHAR(c[i]);
1443 buffer[j] = 0;
1444 fprintf(stderr, "%s\n", buffer);
1445 } else {
1446 int i;
1447 for(i=0;i<11;i++)
1448 ADD_CHAR(direntry->name[i]);
1449 buffer[j] = 0;
1450 fprintf(stderr, "%s attributes=0x%02x begin=%u size=%u\n",
1451 buffer,
1452 direntry->attributes,
1453 begin_of_direntry(direntry),le32_to_cpu(direntry->size));
1454 }
1455}
1456
1457static void print_mapping(const mapping_t* mapping)
1458{
1459 fprintf(stderr, "mapping (%p): begin, end = %u, %u, dir_index = %u, "
1460 "first_mapping_index = %d, name = %s, mode = 0x%x, " ,
1461 mapping, mapping->begin, mapping->end, mapping->dir_index,
1462 mapping->first_mapping_index, mapping->path, mapping->mode);
1463
1464 if (mapping->mode & MODE_DIRECTORY)
1465 fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
1466 else
1467 fprintf(stderr, "offset = %u\n", mapping->info.file.offset);
1468}
1469#endif
1470
1471static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
1472 uint8_t *buf, int nb_sectors)
1473{
1474 BDRVVVFATState *s = bs->opaque;
1475 int i;
1476
1477 for(i=0;i<nb_sectors;i++,sector_num++) {
1478 if (sector_num >= bs->total_sectors)
1479 return -1;
1480 if (s->qcow) {
1481 int64_t n;
1482 int ret;
1483 ret = bdrv_is_allocated(s->qcow->bs, sector_num * BDRV_SECTOR_SIZE,
1484 (nb_sectors - i) * BDRV_SECTOR_SIZE, &n);
1485 if (ret < 0) {
1486 return ret;
1487 }
1488 if (ret) {
1489 DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
1490 " allocated\n", sector_num,
1491 n >> BDRV_SECTOR_BITS));
1492 if (bdrv_pread(s->qcow, sector_num * BDRV_SECTOR_SIZE,
1493 buf + i * 0x200, n) < 0) {
1494 return -1;
1495 }
1496 i += (n >> BDRV_SECTOR_BITS) - 1;
1497 sector_num += (n >> BDRV_SECTOR_BITS) - 1;
1498 continue;
1499 }
1500 DLOG(fprintf(stderr, "sector %" PRId64 " not allocated\n",
1501 sector_num));
1502 }
1503 if (sector_num < s->offset_to_root_dir) {
1504 if (sector_num < s->offset_to_fat) {
1505 memcpy(buf + i * 0x200,
1506 &(s->first_sectors[sector_num * 0x200]),
1507 0x200);
1508 } else if (sector_num < s->offset_to_fat + s->sectors_per_fat) {
1509 memcpy(buf + i * 0x200,
1510 &(s->fat.pointer[(sector_num
1511 - s->offset_to_fat) * 0x200]),
1512 0x200);
1513 } else if (sector_num < s->offset_to_root_dir) {
1514 memcpy(buf + i * 0x200,
1515 &(s->fat.pointer[(sector_num - s->offset_to_fat
1516 - s->sectors_per_fat) * 0x200]),
1517 0x200);
1518 }
1519 } else {
1520 uint32_t sector = sector_num - s->offset_to_root_dir,
1521 sector_offset_in_cluster=(sector%s->sectors_per_cluster),
1522 cluster_num=sector/s->sectors_per_cluster;
1523 if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
1524
1525 memset(buf+i*0x200,0,0x200);
1526 continue;
1527 }
1528 memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
1529 }
1530 }
1531 return 0;
1532}
1533
1534static int coroutine_fn
1535vvfat_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
1536 QEMUIOVector *qiov, BdrvRequestFlags flags)
1537{
1538 int ret;
1539 BDRVVVFATState *s = bs->opaque;
1540 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
1541 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
1542 void *buf;
1543
1544 assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
1545 assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
1546
1547 buf = g_try_malloc(bytes);
1548 if (bytes && buf == NULL) {
1549 return -ENOMEM;
1550 }
1551
1552 qemu_co_mutex_lock(&s->lock);
1553 ret = vvfat_read(bs, sector_num, buf, nb_sectors);
1554 qemu_co_mutex_unlock(&s->lock);
1555
1556 qemu_iovec_from_buf(qiov, 0, buf, bytes);
1557 g_free(buf);
1558
1559 return ret;
1560}
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584typedef struct commit_t {
1585 char* path;
1586 union {
1587 struct { uint32_t cluster; } rename;
1588 struct { int dir_index; uint32_t modified_offset; } writeout;
1589 struct { uint32_t first_cluster; } new_file;
1590 struct { uint32_t cluster; } mkdir;
1591 } param;
1592
1593 enum {
1594 ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
1595 } action;
1596} commit_t;
1597
1598static void clear_commits(BDRVVVFATState* s)
1599{
1600 int i;
1601DLOG(fprintf(stderr, "clear_commits (%u commits)\n", s->commits.next));
1602 for (i = 0; i < s->commits.next; i++) {
1603 commit_t* commit = array_get(&(s->commits), i);
1604 assert(commit->path || commit->action == ACTION_WRITEOUT);
1605 if (commit->action != ACTION_WRITEOUT) {
1606 assert(commit->path);
1607 g_free(commit->path);
1608 } else
1609 assert(commit->path == NULL);
1610 }
1611 s->commits.next = 0;
1612}
1613
1614static void schedule_rename(BDRVVVFATState* s,
1615 uint32_t cluster, char* new_path)
1616{
1617 commit_t* commit = array_get_next(&(s->commits));
1618 commit->path = new_path;
1619 commit->param.rename.cluster = cluster;
1620 commit->action = ACTION_RENAME;
1621}
1622
1623static void schedule_writeout(BDRVVVFATState* s,
1624 int dir_index, uint32_t modified_offset)
1625{
1626 commit_t* commit = array_get_next(&(s->commits));
1627 commit->path = NULL;
1628 commit->param.writeout.dir_index = dir_index;
1629 commit->param.writeout.modified_offset = modified_offset;
1630 commit->action = ACTION_WRITEOUT;
1631}
1632
1633static void schedule_new_file(BDRVVVFATState* s,
1634 char* path, uint32_t first_cluster)
1635{
1636 commit_t* commit = array_get_next(&(s->commits));
1637 commit->path = path;
1638 commit->param.new_file.first_cluster = first_cluster;
1639 commit->action = ACTION_NEW_FILE;
1640}
1641
1642static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
1643{
1644 commit_t* commit = array_get_next(&(s->commits));
1645 commit->path = path;
1646 commit->param.mkdir.cluster = cluster;
1647 commit->action = ACTION_MKDIR;
1648}
1649
1650typedef struct {
1651
1652
1653
1654
1655
1656 unsigned char name[0x3f * 13 + 1];
1657 gunichar2 name2[0x3f * 13 + 1];
1658 int checksum, len;
1659 int sequence_number;
1660} long_file_name;
1661
1662static void lfn_init(long_file_name* lfn)
1663{
1664 lfn->sequence_number = lfn->len = 0;
1665 lfn->checksum = 0x100;
1666}
1667
1668
1669static int parse_long_name(long_file_name* lfn,
1670 const direntry_t* direntry)
1671{
1672 int i, j, offset;
1673 const unsigned char* pointer = (const unsigned char*)direntry;
1674
1675 if (!is_long_name(direntry))
1676 return 1;
1677
1678 if (pointer[0] & 0x40) {
1679
1680 lfn->sequence_number = pointer[0] & 0x3f;
1681 lfn->checksum = pointer[13];
1682 lfn->name[0] = 0;
1683 lfn->name[lfn->sequence_number * 13] = 0;
1684 } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) {
1685
1686 return -1;
1687 } else if (pointer[13] != lfn->checksum) {
1688
1689 return -2;
1690 } else if (pointer[12] || pointer[26] || pointer[27]) {
1691
1692 return -3;
1693 }
1694
1695 offset = 13 * (lfn->sequence_number - 1);
1696 for (i = 0, j = 1; i < 13; i++, j+=2) {
1697 if (j == 11)
1698 j = 14;
1699 else if (j == 26)
1700 j = 28;
1701
1702 if (pointer[j] == 0 && pointer[j + 1] == 0) {
1703
1704 break;
1705 }
1706 gunichar2 c = (pointer[j + 1] << 8) + pointer[j];
1707 lfn->name2[offset + i] = c;
1708 }
1709
1710 if (pointer[0] & 0x40) {
1711
1712 lfn->len = offset + i;
1713 }
1714 if ((pointer[0] & 0x3f) == 0x01) {
1715
1716 glong olen;
1717 gchar *utf8 = g_utf16_to_utf8(lfn->name2, lfn->len, NULL, &olen, NULL);
1718 if (!utf8) {
1719 return -4;
1720 }
1721 lfn->len = olen;
1722 memcpy(lfn->name, utf8, olen + 1);
1723 g_free(utf8);
1724 }
1725
1726 return 0;
1727}
1728
1729
1730static int parse_short_name(BDRVVVFATState* s,
1731 long_file_name* lfn, direntry_t* direntry)
1732{
1733 int i, j;
1734
1735 if (!is_short_name(direntry))
1736 return 1;
1737
1738 for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
1739 for (i = 0; i <= j; i++) {
1740 uint8_t c = direntry->name[i];
1741 if (c != to_valid_short_char(c)) {
1742 return -1;
1743 } else if (s->downcase_short_names) {
1744 lfn->name[i] = qemu_tolower(direntry->name[i]);
1745 } else {
1746 lfn->name[i] = direntry->name[i];
1747 }
1748 }
1749
1750 for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) {
1751 }
1752 if (j >= 0) {
1753 lfn->name[i++] = '.';
1754 lfn->name[i + j + 1] = '\0';
1755 for (;j >= 0; j--) {
1756 uint8_t c = direntry->name[8 + j];
1757 if (c != to_valid_short_char(c)) {
1758 return -2;
1759 } else if (s->downcase_short_names) {
1760 lfn->name[i + j] = qemu_tolower(c);
1761 } else {
1762 lfn->name[i + j] = c;
1763 }
1764 }
1765 } else
1766 lfn->name[i + j + 1] = '\0';
1767
1768 if (lfn->name[0] == DIR_KANJI_FAKE) {
1769 lfn->name[0] = DIR_KANJI;
1770 }
1771 lfn->len = strlen((char*)lfn->name);
1772
1773 return 0;
1774}
1775
1776static inline uint32_t modified_fat_get(BDRVVVFATState* s,
1777 unsigned int cluster)
1778{
1779 if (cluster < s->last_cluster_of_root_directory) {
1780 if (cluster + 1 == s->last_cluster_of_root_directory)
1781 return s->max_fat_value;
1782 else
1783 return cluster + 1;
1784 }
1785
1786 if (s->fat_type==32) {
1787 uint32_t* entry=((uint32_t*)s->fat2)+cluster;
1788 return le32_to_cpu(*entry);
1789 } else if (s->fat_type==16) {
1790 uint16_t* entry=((uint16_t*)s->fat2)+cluster;
1791 return le16_to_cpu(*entry);
1792 } else {
1793 const uint8_t* x=s->fat2+cluster*3/2;
1794 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
1795 }
1796}
1797
1798static inline bool cluster_was_modified(BDRVVVFATState *s,
1799 uint32_t cluster_num)
1800{
1801 int was_modified = 0;
1802 int i;
1803
1804 if (s->qcow == NULL) {
1805 return 0;
1806 }
1807
1808 for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
1809 was_modified = bdrv_is_allocated(s->qcow->bs,
1810 (cluster2sector(s, cluster_num) +
1811 i) * BDRV_SECTOR_SIZE,
1812 BDRV_SECTOR_SIZE, NULL);
1813 }
1814
1815
1816
1817
1818
1819
1820
1821 return !!was_modified;
1822}
1823
1824static const char* get_basename(const char* path)
1825{
1826 char* basename = strrchr(path, '/');
1827 if (basename == NULL)
1828 return path;
1829 else
1830 return basename + 1;
1831}
1832
1833
1834
1835
1836
1837
1838
1839
1840typedef enum {
1841 USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
1842} used_t;
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
1855 direntry_t* direntry, const char* path)
1856{
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874 int copy_it = 0;
1875 int was_modified = 0;
1876 int32_t ret = 0;
1877
1878 uint32_t cluster_num = begin_of_direntry(direntry);
1879 uint32_t offset = 0;
1880 int first_mapping_index = -1;
1881 mapping_t* mapping = NULL;
1882 const char* basename2 = NULL;
1883
1884 vvfat_close_current_file(s);
1885
1886
1887 if (cluster_num == 0)
1888 return 0;
1889
1890
1891 if (s->qcow) {
1892 basename2 = get_basename(path);
1893
1894 mapping = find_mapping_for_cluster(s, cluster_num);
1895
1896 if (mapping) {
1897 const char* basename;
1898
1899 assert(mapping->mode & MODE_DELETED);
1900 mapping->mode &= ~MODE_DELETED;
1901
1902 basename = get_basename(mapping->path);
1903
1904 assert(mapping->mode & MODE_NORMAL);
1905
1906
1907 if (strcmp(basename, basename2))
1908 schedule_rename(s, cluster_num, g_strdup(path));
1909 } else if (is_file(direntry))
1910
1911 schedule_new_file(s, g_strdup(path), cluster_num);
1912 else {
1913 abort();
1914 return 0;
1915 }
1916 }
1917
1918 while(1) {
1919 if (s->qcow) {
1920 if (!copy_it && cluster_was_modified(s, cluster_num)) {
1921 if (mapping == NULL ||
1922 mapping->begin > cluster_num ||
1923 mapping->end <= cluster_num)
1924 mapping = find_mapping_for_cluster(s, cluster_num);
1925
1926
1927 if (mapping &&
1928 (mapping->mode & MODE_DIRECTORY) == 0) {
1929
1930
1931 if (offset != mapping->info.file.offset + s->cluster_size
1932 * (cluster_num - mapping->begin)) {
1933
1934 abort();
1935 copy_it = 1;
1936 } else if (offset == 0) {
1937 const char* basename = get_basename(mapping->path);
1938
1939 if (strcmp(basename, basename2))
1940 copy_it = 1;
1941 first_mapping_index = array_index(&(s->mapping), mapping);
1942 }
1943
1944 if (mapping->first_mapping_index != first_mapping_index
1945 && mapping->info.file.offset > 0) {
1946 abort();
1947 copy_it = 1;
1948 }
1949
1950
1951 if (!was_modified && is_file(direntry)) {
1952 was_modified = 1;
1953 schedule_writeout(s, mapping->dir_index, offset);
1954 }
1955 }
1956 }
1957
1958 if (copy_it) {
1959 int i;
1960
1961
1962
1963
1964 int64_t offset = cluster2sector(s, cluster_num);
1965
1966 vvfat_close_current_file(s);
1967 for (i = 0; i < s->sectors_per_cluster; i++) {
1968 int res;
1969
1970 res = bdrv_is_allocated(s->qcow->bs,
1971 (offset + i) * BDRV_SECTOR_SIZE,
1972 BDRV_SECTOR_SIZE, NULL);
1973 if (res < 0) {
1974 return -1;
1975 }
1976 if (!res) {
1977 res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
1978 if (res) {
1979 return -1;
1980 }
1981 res = bdrv_pwrite(s->qcow, offset * BDRV_SECTOR_SIZE,
1982 s->cluster_buffer, BDRV_SECTOR_SIZE);
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
2986DLOG(checkpoint());
2987
2988
2989 if (s->qcow == NULL) {
2990 return -EACCES;
2991 }
2992
2993 vvfat_close_current_file(s);
2994
2995
2996
2997
2998
2999
3000 if (sector_num < s->offset_to_fat)
3001 return -1;
3002
3003 for (i = sector2cluster(s, sector_num);
3004 i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
3005 mapping_t* mapping = find_mapping_for_cluster(s, i);
3006 if (mapping) {
3007 if (mapping->read_only) {
3008 fprintf(stderr, "Tried to write to write-protected file %s\n",
3009 mapping->path);
3010 return -1;
3011 }
3012
3013 if (mapping->mode & MODE_DIRECTORY) {
3014 int begin = cluster2sector(s, i);
3015 int end = begin + s->sectors_per_cluster, k;
3016 int dir_index;
3017 const direntry_t* direntries;
3018 long_file_name lfn;
3019
3020 lfn_init(&lfn);
3021
3022 if (begin < sector_num)
3023 begin = sector_num;
3024 if (end > sector_num + nb_sectors)
3025 end = sector_num + nb_sectors;
3026 dir_index = mapping->dir_index +
3027 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
3028 direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
3029
3030 for (k = 0; k < (end - begin) * 0x10; k++) {
3031
3032 if (is_short_name(direntries + k) &&
3033 (direntries[k].attributes & 1)) {
3034 if (memcmp(direntries + k,
3035 array_get(&(s->directory), dir_index + k),
3036 sizeof(direntry_t))) {
3037 warn_report("tried to write to write-protected "
3038 "file");
3039 return -1;
3040 }
3041 }
3042 }
3043 }
3044 i = mapping->end;
3045 } else
3046 i++;
3047 }
3048
3049
3050
3051
3052DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
3053 ret = bdrv_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE, buf,
3054 nb_sectors * BDRV_SECTOR_SIZE);
3055 if (ret < 0) {
3056 fprintf(stderr, "Error writing to qcow backend\n");
3057 return ret;
3058 }
3059
3060 for (i = sector2cluster(s, sector_num);
3061 i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
3062 if (i >= 0)
3063 s->used_clusters[i] |= USED_ALLOCATED;
3064
3065DLOG(checkpoint());
3066
3067 try_commit(s);
3068
3069DLOG(checkpoint());
3070 return 0;
3071}
3072
3073static int coroutine_fn
3074vvfat_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
3075 QEMUIOVector *qiov, BdrvRequestFlags flags)
3076{
3077 int ret;
3078 BDRVVVFATState *s = bs->opaque;
3079 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
3080 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
3081 void *buf;
3082
3083 assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
3084 assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
3085
3086 buf = g_try_malloc(bytes);
3087 if (bytes && buf == NULL) {
3088 return -ENOMEM;
3089 }
3090 qemu_iovec_to_buf(qiov, 0, buf, bytes);
3091
3092 qemu_co_mutex_lock(&s->lock);
3093 ret = vvfat_write(bs, sector_num, buf, nb_sectors);
3094 qemu_co_mutex_unlock(&s->lock);
3095
3096 g_free(buf);
3097
3098 return ret;
3099}
3100
3101static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs,
3102 bool want_zero, int64_t offset,
3103 int64_t bytes, int64_t *n,
3104 int64_t *map,
3105 BlockDriverState **file)
3106{
3107 *n = bytes;
3108 return BDRV_BLOCK_DATA;
3109}
3110
3111static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format,
3112 int *child_flags, QDict *child_options,
3113 int parent_flags, QDict *parent_options)
3114{
3115 qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
3116 qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off");
3117 qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on");
3118}
3119
3120static BdrvChildClass child_vvfat_qcow;
3121
3122static int enable_write_target(BlockDriverState *bs, Error **errp)
3123{
3124 BDRVVVFATState *s = bs->opaque;
3125 BlockDriver *bdrv_qcow = NULL;
3126 QemuOpts *opts = NULL;
3127 int ret;
3128 int size = sector2cluster(s, s->sector_count);
3129 QDict *options;
3130
3131 s->used_clusters = g_malloc0(size);
3132
3133 array_init(&(s->commits), sizeof(commit_t));
3134
3135 s->qcow_filename = g_malloc(PATH_MAX);
3136 ret = get_tmp_filename(s->qcow_filename, PATH_MAX);
3137 if (ret < 0) {
3138 error_setg_errno(errp, -ret, "can't create temporary file");
3139 goto err;
3140 }
3141
3142 bdrv_qcow = bdrv_find_format("qcow");
3143 if (!bdrv_qcow) {
3144 error_setg(errp, "Failed to locate qcow driver");
3145 ret = -ENOENT;
3146 goto err;
3147 }
3148
3149 opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
3150 qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512,
3151 &error_abort);
3152 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
3153
3154 ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
3155 qemu_opts_del(opts);
3156 if (ret < 0) {
3157 goto err;
3158 }
3159
3160 options = qdict_new();
3161 qdict_put_str(options, "write-target.driver", "qcow");
3162 s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
3163 &child_vvfat_qcow,
3164 BDRV_CHILD_DATA | BDRV_CHILD_METADATA,
3165 false, errp);
3166 qobject_unref(options);
3167 if (!s->qcow) {
3168 ret = -EINVAL;
3169 goto err;
3170 }
3171
3172#ifndef _WIN32
3173 unlink(s->qcow_filename);
3174#endif
3175
3176 return 0;
3177
3178err:
3179 return ret;
3180}
3181
3182static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
3183 BdrvChildRole role,
3184 BlockReopenQueue *reopen_queue,
3185 uint64_t perm, uint64_t shared,
3186 uint64_t *nperm, uint64_t *nshared)
3187{
3188 assert(role & BDRV_CHILD_DATA);
3189
3190 *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
3191 *nshared = BLK_PERM_WRITE_UNCHANGED;
3192}
3193
3194static void vvfat_close(BlockDriverState *bs)
3195{
3196 BDRVVVFATState *s = bs->opaque;
3197
3198 vvfat_close_current_file(s);
3199 array_free(&(s->fat));
3200 array_free(&(s->directory));
3201 array_free(&(s->mapping));
3202 g_free(s->cluster_buffer);
3203
3204 if (s->qcow) {
3205 migrate_del_blocker(s->migration_blocker);
3206 error_free(s->migration_blocker);
3207 }
3208}
3209
3210static const char *const vvfat_strong_runtime_opts[] = {
3211 "dir",
3212 "fat-type",
3213 "floppy",
3214 "label",
3215 "rw",
3216
3217 NULL
3218};
3219
3220static BlockDriver bdrv_vvfat = {
3221 .format_name = "vvfat",
3222 .protocol_name = "fat",
3223 .instance_size = sizeof(BDRVVVFATState),
3224
3225 .bdrv_parse_filename = vvfat_parse_filename,
3226 .bdrv_file_open = vvfat_open,
3227 .bdrv_refresh_limits = vvfat_refresh_limits,
3228 .bdrv_close = vvfat_close,
3229 .bdrv_child_perm = vvfat_child_perm,
3230
3231 .bdrv_co_preadv = vvfat_co_preadv,
3232 .bdrv_co_pwritev = vvfat_co_pwritev,
3233 .bdrv_co_block_status = vvfat_co_block_status,
3234
3235 .strong_runtime_opts = vvfat_strong_runtime_opts,
3236};
3237
3238static void bdrv_vvfat_init(void)
3239{
3240 child_vvfat_qcow = child_of_bds;
3241 child_vvfat_qcow.inherit_options = vvfat_qcow_options;
3242 bdrv_register(&bdrv_vvfat);
3243}
3244
3245block_init(bdrv_vvfat_init);
3246
3247#ifdef DEBUG
3248static void checkpoint(void)
3249{
3250 assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
3251 check1(vvv);
3252 check2(vvv);
3253 assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
3254}
3255#endif
3256