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26#include "qemu/osdep.h"
27#include <dirent.h>
28#include <glib/gstdio.h>
29#include "qapi/error.h"
30#include "block/block_int.h"
31#include "block/qdict.h"
32#include "qemu/module.h"
33#include "qemu/option.h"
34#include "qemu/bswap.h"
35#include "migration/blocker.h"
36#include "qapi/qmp/qdict.h"
37#include "qapi/qmp/qstring.h"
38#include "qemu/ctype.h"
39#include "qemu/cutils.h"
40#include "qemu/error-report.h"
41
42#ifndef S_IWGRP
43#define S_IWGRP 0
44#endif
45#ifndef S_IWOTH
46#define S_IWOTH 0
47#endif
48
49
50
51
52
53
54
55
56
57
58
59#ifdef DEBUG
60
61#define DLOG(a) a
62
63static void checkpoint(void);
64
65#else
66
67#define DLOG(a)
68
69#endif
70
71
72
73
74
75#define BOOTSECTOR_OEM_NAME "MSWIN4.1"
76
77#define DIR_DELETED 0xe5
78#define DIR_KANJI DIR_DELETED
79#define DIR_KANJI_FAKE 0x05
80#define DIR_FREE 0x00
81
82
83typedef struct array_t {
84 char* pointer;
85 unsigned int size,next,item_size;
86} array_t;
87
88static inline void array_init(array_t* array,unsigned int item_size)
89{
90 array->pointer = NULL;
91 array->size=0;
92 array->next=0;
93 array->item_size=item_size;
94}
95
96static inline void array_free(array_t* array)
97{
98 g_free(array->pointer);
99 array->size=array->next=0;
100}
101
102
103static inline void* array_get(array_t* array,unsigned int index) {
104 assert(index < array->next);
105 assert(array->pointer);
106 return array->pointer + index * array->item_size;
107}
108
109static inline void array_ensure_allocated(array_t *array, int index)
110{
111 if((index + 1) * array->item_size > array->size) {
112 int new_size = (index + 32) * array->item_size;
113 array->pointer = g_realloc(array->pointer, new_size);
114 assert(array->pointer);
115 memset(array->pointer + array->size, 0, new_size - array->size);
116 array->size = new_size;
117 array->next = index + 1;
118 }
119}
120
121static inline void* array_get_next(array_t* array) {
122 unsigned int next = array->next;
123
124 array_ensure_allocated(array, next);
125 array->next = next + 1;
126 return array_get(array, next);
127}
128
129static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
130 if((array->next+count)*array->item_size>array->size) {
131 int increment=count*array->item_size;
132 array->pointer=g_realloc(array->pointer,array->size+increment);
133 if(!array->pointer)
134 return NULL;
135 array->size+=increment;
136 }
137 memmove(array->pointer+(index+count)*array->item_size,
138 array->pointer+index*array->item_size,
139 (array->next-index)*array->item_size);
140 array->next+=count;
141 return array->pointer+index*array->item_size;
142}
143
144static inline int array_remove_slice(array_t* array,int index, int count)
145{
146 assert(index >=0);
147 assert(count > 0);
148 assert(index + count <= array->next);
149
150 memmove(array->pointer + index * array->item_size,
151 array->pointer + (index + count) * array->item_size,
152 (array->next - index - count) * array->item_size);
153
154 array->next -= count;
155 return 0;
156}
157
158static int array_remove(array_t* array,int index)
159{
160 return array_remove_slice(array, index, 1);
161}
162
163
164static int array_index(array_t* array, void* pointer)
165{
166 size_t offset = (char*)pointer - array->pointer;
167 assert((offset % array->item_size) == 0);
168 assert(offset/array->item_size < array->next);
169 return offset/array->item_size;
170}
171
172
173
174
175typedef struct bootsector_t {
176 uint8_t jump[3];
177 uint8_t name[8];
178 uint16_t sector_size;
179 uint8_t sectors_per_cluster;
180 uint16_t reserved_sectors;
181 uint8_t number_of_fats;
182 uint16_t root_entries;
183 uint16_t total_sectors16;
184 uint8_t media_type;
185 uint16_t sectors_per_fat;
186 uint16_t sectors_per_track;
187 uint16_t number_of_heads;
188 uint32_t hidden_sectors;
189 uint32_t total_sectors;
190 union {
191 struct {
192 uint8_t drive_number;
193 uint8_t reserved1;
194 uint8_t signature;
195 uint32_t id;
196 uint8_t volume_label[11];
197 uint8_t fat_type[8];
198 uint8_t ignored[0x1c0];
199 } QEMU_PACKED fat16;
200 struct {
201 uint32_t sectors_per_fat;
202 uint16_t flags;
203 uint8_t major,minor;
204 uint32_t first_cluster_of_root_dir;
205 uint16_t info_sector;
206 uint16_t backup_boot_sector;
207 uint8_t reserved[12];
208 uint8_t drive_number;
209 uint8_t reserved1;
210 uint8_t signature;
211 uint32_t id;
212 uint8_t volume_label[11];
213 uint8_t fat_type[8];
214 uint8_t ignored[0x1a4];
215 } QEMU_PACKED fat32;
216 } u;
217 uint8_t magic[2];
218} QEMU_PACKED bootsector_t;
219
220typedef struct {
221 uint8_t head;
222 uint8_t sector;
223 uint8_t cylinder;
224} mbr_chs_t;
225
226typedef struct partition_t {
227 uint8_t attributes;
228 mbr_chs_t start_CHS;
229 uint8_t fs_type;
230 mbr_chs_t end_CHS;
231 uint32_t start_sector_long;
232 uint32_t length_sector_long;
233} QEMU_PACKED partition_t;
234
235typedef struct mbr_t {
236 uint8_t ignored[0x1b8];
237 uint32_t nt_id;
238 uint8_t ignored2[2];
239 partition_t partition[4];
240 uint8_t magic[2];
241} QEMU_PACKED mbr_t;
242
243typedef struct direntry_t {
244 uint8_t name[8 + 3];
245 uint8_t attributes;
246 uint8_t reserved[2];
247 uint16_t ctime;
248 uint16_t cdate;
249 uint16_t adate;
250 uint16_t begin_hi;
251 uint16_t mtime;
252 uint16_t mdate;
253 uint16_t begin;
254 uint32_t size;
255} QEMU_PACKED direntry_t;
256
257
258
259typedef struct mapping_t {
260
261 uint32_t begin,end;
262
263 unsigned int dir_index;
264
265 int first_mapping_index;
266 union {
267
268
269
270
271 struct {
272 uint32_t offset;
273 } file;
274 struct {
275 int parent_mapping_index;
276 int first_dir_index;
277 } dir;
278 } info;
279
280 char* path;
281
282 enum {
283 MODE_UNDEFINED = 0,
284 MODE_NORMAL = 1,
285 MODE_MODIFIED = 2,
286 MODE_DIRECTORY = 4,
287 MODE_DELETED = 8,
288 } mode;
289 int read_only;
290} mapping_t;
291
292#ifdef DEBUG
293static void print_direntry(const struct direntry_t*);
294static void print_mapping(const struct mapping_t* mapping);
295#endif
296
297
298
299typedef struct BDRVVVFATState {
300 CoMutex lock;
301 BlockDriverState* bs;
302 unsigned char first_sectors[0x40*0x200];
303
304 int fat_type;
305 array_t fat,directory,mapping;
306 char volume_label[11];
307
308 uint32_t offset_to_bootsector;
309
310 unsigned int cluster_size;
311 unsigned int sectors_per_cluster;
312 unsigned int sectors_per_fat;
313 uint32_t last_cluster_of_root_directory;
314
315 uint16_t root_entries;
316 uint32_t sector_count;
317 uint32_t cluster_count;
318 uint32_t max_fat_value;
319 uint32_t offset_to_fat;
320 uint32_t offset_to_root_dir;
321
322 int current_fd;
323 mapping_t* current_mapping;
324 unsigned char* cluster;
325 unsigned char* cluster_buffer;
326 unsigned int current_cluster;
327
328
329 char* qcow_filename;
330 BdrvChild* qcow;
331 void* fat2;
332 char* used_clusters;
333 array_t commits;
334 const char* path;
335 int downcase_short_names;
336
337 Error *migration_blocker;
338} BDRVVVFATState;
339
340
341
342
343
344static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs)
345{
346 int head,sector;
347 sector = spos % secs; spos /= secs;
348 head = spos % heads; spos /= heads;
349 if (spos >= cyls) {
350
351
352
353 chs->head = 0xFF;
354 chs->sector = 0xFF;
355 chs->cylinder = 0xFF;
356 return 1;
357 }
358 chs->head = (uint8_t)head;
359 chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
360 chs->cylinder = (uint8_t)spos;
361 return 0;
362}
363
364static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
365{
366
367 mbr_t* real_mbr=(mbr_t*)s->first_sectors;
368 partition_t* partition = &(real_mbr->partition[0]);
369 int lba;
370
371 memset(s->first_sectors,0,512);
372
373
374 real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
375
376 partition->attributes=0x80;
377
378
379 lba = sector2CHS(&partition->start_CHS, s->offset_to_bootsector,
380 cyls, heads, secs);
381 lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
382 cyls, heads, secs);
383
384
385 partition->start_sector_long = cpu_to_le32(s->offset_to_bootsector);
386 partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
387 - s->offset_to_bootsector);
388
389
390
391
392 partition->fs_type = s->fat_type == 12 ? 0x1 :
393 s->fat_type == 16 ? (lba ? 0xe : 0x06) :
394 (lba ? 0xc : 0x0b);
395
396 real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
397}
398
399
400
401static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
402{
403 int number_of_entries, i;
404 glong length;
405 direntry_t *entry;
406
407 gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
408 if (!longname) {
409 fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
410 return NULL;
411 }
412
413 number_of_entries = DIV_ROUND_UP(length * 2, 26);
414
415 for(i=0;i<number_of_entries;i++) {
416 entry=array_get_next(&(s->directory));
417 entry->attributes=0xf;
418 entry->reserved[0]=0;
419 entry->begin=0;
420 entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
421 }
422 for(i=0;i<26*number_of_entries;i++) {
423 int offset=(i%26);
424 if(offset<10) offset=1+offset;
425 else if(offset<22) offset=14+offset-10;
426 else offset=28+offset-22;
427 entry=array_get(&(s->directory),s->directory.next-1-(i/26));
428 if (i >= 2 * length + 2) {
429 entry->name[offset] = 0xff;
430 } else if (i % 2 == 0) {
431 entry->name[offset] = longname[i / 2] & 0xff;
432 } else {
433 entry->name[offset] = longname[i / 2] >> 8;
434 }
435 }
436 g_free(longname);
437 return array_get(&(s->directory),s->directory.next-number_of_entries);
438}
439
440static char is_free(const direntry_t* direntry)
441{
442 return direntry->name[0] == DIR_DELETED || direntry->name[0] == DIR_FREE;
443}
444
445static char is_volume_label(const direntry_t* direntry)
446{
447 return direntry->attributes == 0x28;
448}
449
450static char is_long_name(const direntry_t* direntry)
451{
452 return direntry->attributes == 0xf;
453}
454
455static char is_short_name(const direntry_t* direntry)
456{
457 return !is_volume_label(direntry) && !is_long_name(direntry)
458 && !is_free(direntry);
459}
460
461static char is_directory(const direntry_t* direntry)
462{
463 return direntry->attributes & 0x10 && direntry->name[0] != DIR_DELETED;
464}
465
466static inline char is_dot(const direntry_t* direntry)
467{
468 return is_short_name(direntry) && direntry->name[0] == '.';
469}
470
471static char is_file(const direntry_t* direntry)
472{
473 return is_short_name(direntry) && !is_directory(direntry);
474}
475
476static inline uint32_t begin_of_direntry(const direntry_t* direntry)
477{
478 return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
479}
480
481static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
482{
483 return le32_to_cpu(direntry->size);
484}
485
486static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
487{
488 direntry->begin = cpu_to_le16(begin & 0xffff);
489 direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
490}
491
492static bool valid_filename(const unsigned char *name)
493{
494 unsigned char c;
495 if (!strcmp((const char*)name, ".") || !strcmp((const char*)name, "..")) {
496 return false;
497 }
498 for (; (c = *name); name++) {
499 if (!((c >= '0' && c <= '9') ||
500 (c >= 'A' && c <= 'Z') ||
501 (c >= 'a' && c <= 'z') ||
502 c > 127 ||
503 strchr(" $%'-_@~`!(){}^#&.+,;=[]", c) != NULL))
504 {
505 return false;
506 }
507 }
508 return true;
509}
510
511static uint8_t to_valid_short_char(gunichar c)
512{
513 c = g_unichar_toupper(c);
514 if ((c >= '0' && c <= '9') ||
515 (c >= 'A' && c <= 'Z') ||
516 strchr("$%'-_@~`!(){}^#&", c) != NULL) {
517 return c;
518 } else {
519 return 0;
520 }
521}
522
523static direntry_t *create_short_filename(BDRVVVFATState *s,
524 const char *filename,
525 unsigned int directory_start)
526{
527 int i, j = 0;
528 direntry_t *entry = array_get_next(&(s->directory));
529 const gchar *p, *last_dot = NULL;
530 gunichar c;
531 bool lossy_conversion = false;
532 char tail[8];
533
534 if (!entry) {
535 return NULL;
536 }
537 memset(entry->name, 0x20, sizeof(entry->name));
538
539
540 for (p = filename; ; p = g_utf8_next_char(p)) {
541 c = g_utf8_get_char(p);
542 if (c == '\0') {
543 break;
544 } else if (c == '.') {
545 if (j == 0) {
546
547 lossy_conversion = true;
548 } else {
549 if (last_dot) {
550 lossy_conversion = true;
551 }
552 last_dot = p;
553 }
554 } else if (!last_dot) {
555
556 uint8_t v = to_valid_short_char(c);
557 if (j < 8 && v) {
558 entry->name[j++] = v;
559 } else {
560 lossy_conversion = true;
561 }
562 }
563 }
564
565
566 if (last_dot) {
567 j = 0;
568 for (p = g_utf8_next_char(last_dot); ; p = g_utf8_next_char(p)) {
569 c = g_utf8_get_char(p);
570 if (c == '\0') {
571 break;
572 } else {
573
574 uint8_t v = to_valid_short_char(c);
575 if (j < 3 && v) {
576 entry->name[8 + (j++)] = v;
577 } else {
578 lossy_conversion = true;
579 }
580 }
581 }
582 }
583
584 if (entry->name[0] == DIR_KANJI) {
585 entry->name[0] = DIR_KANJI_FAKE;
586 }
587
588
589 for (j = 0; j < 8; j++) {
590 if (entry->name[j] == ' ') {
591 break;
592 }
593 }
594 for (i = lossy_conversion ? 1 : 0; i < 999999; i++) {
595 direntry_t *entry1;
596 if (i > 0) {
597 int len = snprintf(tail, sizeof(tail), "~%u", (unsigned)i);
598 assert(len <= 7);
599 memcpy(entry->name + MIN(j, 8 - len), tail, len);
600 }
601 for (entry1 = array_get(&(s->directory), directory_start);
602 entry1 < entry; entry1++) {
603 if (!is_long_name(entry1) &&
604 !memcmp(entry1->name, entry->name, 11)) {
605 break;
606 }
607 }
608 if (entry1 == entry) {
609
610 return entry;
611 }
612 }
613 return NULL;
614}
615
616
617
618static inline uint8_t fat_chksum(const direntry_t* entry)
619{
620 uint8_t chksum=0;
621 int i;
622
623 for (i = 0; i < ARRAY_SIZE(entry->name); i++) {
624 chksum = (((chksum & 0xfe) >> 1) |
625 ((chksum & 0x01) ? 0x80 : 0)) + entry->name[i];
626 }
627
628 return chksum;
629}
630
631
632static uint16_t fat_datetime(time_t time,int return_time) {
633 struct tm* t;
634 struct tm t1;
635 t = &t1;
636 localtime_r(&time,t);
637 if(return_time)
638 return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
639 return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
640}
641
642static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
643{
644 if(s->fat_type==32) {
645 uint32_t* entry=array_get(&(s->fat),cluster);
646 *entry=cpu_to_le32(value);
647 } else if(s->fat_type==16) {
648 uint16_t* entry=array_get(&(s->fat),cluster);
649 *entry=cpu_to_le16(value&0xffff);
650 } else {
651 int offset = (cluster*3/2);
652 unsigned char* p = array_get(&(s->fat), offset);
653 switch (cluster&1) {
654 case 0:
655 p[0] = value&0xff;
656 p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
657 break;
658 case 1:
659 p[0] = (p[0]&0xf) | ((value&0xf)<<4);
660 p[1] = (value>>4);
661 break;
662 }
663 }
664}
665
666static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
667{
668 if(s->fat_type==32) {
669 uint32_t* entry=array_get(&(s->fat),cluster);
670 return le32_to_cpu(*entry);
671 } else if(s->fat_type==16) {
672 uint16_t* entry=array_get(&(s->fat),cluster);
673 return le16_to_cpu(*entry);
674 } else {
675 const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
676 return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
677 }
678}
679
680static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
681{
682 if(fat_entry>s->max_fat_value-8)
683 return -1;
684 return 0;
685}
686
687static inline void init_fat(BDRVVVFATState* s)
688{
689 if (s->fat_type == 12) {
690 array_init(&(s->fat),1);
691 array_ensure_allocated(&(s->fat),
692 s->sectors_per_fat * 0x200 * 3 / 2 - 1);
693 } else {
694 array_init(&(s->fat),(s->fat_type==32?4:2));
695 array_ensure_allocated(&(s->fat),
696 s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
697 }
698 memset(s->fat.pointer,0,s->fat.size);
699
700 switch(s->fat_type) {
701 case 12: s->max_fat_value=0xfff; break;
702 case 16: s->max_fat_value=0xffff; break;
703 case 32: s->max_fat_value=0x0fffffff; break;
704 default: s->max_fat_value=0;
705 }
706
707}
708
709static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
710 unsigned int directory_start, const char* filename, int is_dot)
711{
712 int long_index = s->directory.next;
713 direntry_t* entry = NULL;
714 direntry_t* entry_long = NULL;
715
716 if(is_dot) {
717 entry=array_get_next(&(s->directory));
718 memset(entry->name, 0x20, sizeof(entry->name));
719 memcpy(entry->name,filename,strlen(filename));
720 return entry;
721 }
722
723 entry_long=create_long_filename(s,filename);
724 entry = create_short_filename(s, filename, directory_start);
725
726
727 if(entry_long) {
728 uint8_t chksum=fat_chksum(entry);
729
730
731 entry_long=array_get(&(s->directory),long_index);
732 while(entry_long<entry && is_long_name(entry_long)) {
733 entry_long->reserved[1]=chksum;
734 entry_long++;
735 }
736 }
737
738 return entry;
739}
740
741
742
743
744static int read_directory(BDRVVVFATState* s, int mapping_index)
745{
746 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
747 direntry_t* direntry;
748 const char* dirname = mapping->path;
749 int first_cluster = mapping->begin;
750 int parent_index = mapping->info.dir.parent_mapping_index;
751 mapping_t* parent_mapping = (mapping_t*)
752 (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL);
753 int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
754
755 DIR* dir=opendir(dirname);
756 struct dirent* entry;
757 int i;
758
759 assert(mapping->mode & MODE_DIRECTORY);
760
761 if(!dir) {
762 mapping->end = mapping->begin;
763 return -1;
764 }
765
766 i = mapping->info.dir.first_dir_index =
767 first_cluster == 0 ? 0 : s->directory.next;
768
769 if (first_cluster != 0) {
770
771 (void)create_short_and_long_name(s, i, ".", 1);
772 (void)create_short_and_long_name(s, i, "..", 1);
773 }
774
775
776 while((entry=readdir(dir))) {
777 unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
778 char* buffer;
779 direntry_t* direntry;
780 struct stat st;
781 int is_dot=!strcmp(entry->d_name,".");
782 int is_dotdot=!strcmp(entry->d_name,"..");
783
784 if (first_cluster == 0 && s->directory.next >= s->root_entries - 1) {
785 fprintf(stderr, "Too many entries in root directory\n");
786 closedir(dir);
787 return -2;
788 }
789
790 if(first_cluster == 0 && (is_dotdot || is_dot))
791 continue;
792
793 buffer = g_malloc(length);
794 snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
795
796 if(stat(buffer,&st)<0) {
797 g_free(buffer);
798 continue;
799 }
800
801
802 if (!is_dot && !is_dotdot) {
803 direntry = create_short_and_long_name(s, i, entry->d_name, 0);
804 } else {
805 direntry = array_get(&(s->directory), is_dot ? i : i + 1);
806 }
807 direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
808 direntry->reserved[0]=direntry->reserved[1]=0;
809 direntry->ctime=fat_datetime(st.st_ctime,1);
810 direntry->cdate=fat_datetime(st.st_ctime,0);
811 direntry->adate=fat_datetime(st.st_atime,0);
812 direntry->begin_hi=0;
813 direntry->mtime=fat_datetime(st.st_mtime,1);
814 direntry->mdate=fat_datetime(st.st_mtime,0);
815 if(is_dotdot)
816 set_begin_of_direntry(direntry, first_cluster_of_parent);
817 else if(is_dot)
818 set_begin_of_direntry(direntry, first_cluster);
819 else
820 direntry->begin=0;
821 if (st.st_size > 0x7fffffff) {
822 fprintf(stderr, "File %s is larger than 2GB\n", buffer);
823 g_free(buffer);
824 closedir(dir);
825 return -2;
826 }
827 direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
828
829
830 if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
831 s->current_mapping = array_get_next(&(s->mapping));
832 s->current_mapping->begin=0;
833 s->current_mapping->end=st.st_size;
834
835
836
837
838 s->current_mapping->dir_index=s->directory.next-1;
839 s->current_mapping->first_mapping_index = -1;
840 if (S_ISDIR(st.st_mode)) {
841 s->current_mapping->mode = MODE_DIRECTORY;
842 s->current_mapping->info.dir.parent_mapping_index =
843 mapping_index;
844 } else {
845 s->current_mapping->mode = MODE_UNDEFINED;
846 s->current_mapping->info.file.offset = 0;
847 }
848 s->current_mapping->path=buffer;
849 s->current_mapping->read_only =
850 (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
851 } else {
852 g_free(buffer);
853 }
854 }
855 closedir(dir);
856
857
858 while(s->directory.next%(0x10*s->sectors_per_cluster)) {
859 direntry_t* direntry=array_get_next(&(s->directory));
860 memset(direntry,0,sizeof(direntry_t));
861 }
862
863 if (s->fat_type != 32 &&
864 mapping_index == 0 &&
865 s->directory.next < s->root_entries) {
866
867 int cur = s->directory.next;
868 array_ensure_allocated(&(s->directory), s->root_entries - 1);
869 s->directory.next = s->root_entries;
870 memset(array_get(&(s->directory), cur), 0,
871 (s->root_entries - cur) * sizeof(direntry_t));
872 }
873
874
875 mapping = array_get(&(s->mapping), mapping_index);
876 first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
877 * 0x20 / s->cluster_size;
878 mapping->end = first_cluster;
879
880 direntry = array_get(&(s->directory), mapping->dir_index);
881 set_begin_of_direntry(direntry, mapping->begin);
882
883 return 0;
884}
885
886static inline int32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
887{
888 return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
889}
890
891static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
892{
893 return s->offset_to_root_dir + s->sectors_per_cluster * cluster_num;
894}
895
896static int init_directories(BDRVVVFATState* s,
897 const char *dirname, int heads, int secs,
898 Error **errp)
899{
900 bootsector_t* bootsector;
901 mapping_t* mapping;
902 unsigned int i;
903 unsigned int cluster;
904
905 memset(&(s->first_sectors[0]),0,0x40*0x200);
906
907 s->cluster_size=s->sectors_per_cluster*0x200;
908 s->cluster_buffer=g_malloc(s->cluster_size);
909
910
911
912
913
914
915
916
917 i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
918 s->sectors_per_fat=(s->sector_count+i)/i;
919
920 s->offset_to_fat = s->offset_to_bootsector + 1;
921 s->offset_to_root_dir = s->offset_to_fat + s->sectors_per_fat * 2;
922
923 array_init(&(s->mapping),sizeof(mapping_t));
924 array_init(&(s->directory),sizeof(direntry_t));
925
926
927 {
928 direntry_t* entry=array_get_next(&(s->directory));
929 entry->attributes=0x28;
930 memcpy(entry->name, s->volume_label, sizeof(entry->name));
931 }
932
933
934 init_fat(s);
935
936
937 s->root_entries = 0x02 * 0x10 * s->sectors_per_cluster;
938 s->cluster_count=sector2cluster(s, s->sector_count);
939
940 mapping = array_get_next(&(s->mapping));
941 mapping->begin = 0;
942 mapping->dir_index = 0;
943 mapping->info.dir.parent_mapping_index = -1;
944 mapping->first_mapping_index = -1;
945 mapping->path = g_strdup(dirname);
946 i = strlen(mapping->path);
947 if (i > 0 && mapping->path[i - 1] == '/')
948 mapping->path[i - 1] = '\0';
949 mapping->mode = MODE_DIRECTORY;
950 mapping->read_only = 0;
951 s->path = mapping->path;
952
953 for (i = 0, cluster = 0; i < s->mapping.next; i++) {
954
955
956
957 int fix_fat = (i != 0);
958 mapping = array_get(&(s->mapping), i);
959
960 if (mapping->mode & MODE_DIRECTORY) {
961 char *path = mapping->path;
962 mapping->begin = cluster;
963 if(read_directory(s, i)) {
964 error_setg(errp, "Could not read directory %s", path);
965 return -1;
966 }
967 mapping = array_get(&(s->mapping), i);
968 } else {
969 assert(mapping->mode == MODE_UNDEFINED);
970 mapping->mode=MODE_NORMAL;
971 mapping->begin = cluster;
972 if (mapping->end > 0) {
973 direntry_t* direntry = array_get(&(s->directory),
974 mapping->dir_index);
975
976 mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
977 set_begin_of_direntry(direntry, mapping->begin);
978 } else {
979 mapping->end = cluster + 1;
980 fix_fat = 0;
981 }
982 }
983
984 assert(mapping->begin < mapping->end);
985
986
987 cluster = mapping->end;
988
989 if(cluster > s->cluster_count) {
990 error_setg(errp,
991 "Directory does not fit in FAT%d (capacity %.2f MB)",
992 s->fat_type, s->sector_count / 2000.0);
993 return -1;
994 }
995
996
997 if (fix_fat) {
998 int j;
999 for(j = mapping->begin; j < mapping->end - 1; j++)
1000 fat_set(s, j, j+1);
1001 fat_set(s, mapping->end - 1, s->max_fat_value);
1002 }
1003 }
1004
1005 mapping = array_get(&(s->mapping), 0);
1006 s->last_cluster_of_root_directory = mapping->end;
1007
1008
1009 fat_set(s,0,s->max_fat_value);
1010 fat_set(s,1,s->max_fat_value);
1011
1012 s->current_mapping = NULL;
1013
1014 bootsector = (bootsector_t *)(s->first_sectors
1015 + s->offset_to_bootsector * 0x200);
1016 bootsector->jump[0]=0xeb;
1017 bootsector->jump[1]=0x3e;
1018 bootsector->jump[2]=0x90;
1019 memcpy(bootsector->name, BOOTSECTOR_OEM_NAME, 8);
1020 bootsector->sector_size=cpu_to_le16(0x200);
1021 bootsector->sectors_per_cluster=s->sectors_per_cluster;
1022 bootsector->reserved_sectors=cpu_to_le16(1);
1023 bootsector->number_of_fats=0x2;
1024 bootsector->root_entries = cpu_to_le16(s->root_entries);
1025 bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
1026
1027 bootsector->media_type = (s->offset_to_bootsector > 0 ? 0xf8 : 0xf0);
1028 s->fat.pointer[0] = bootsector->media_type;
1029 bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
1030 bootsector->sectors_per_track = cpu_to_le16(secs);
1031 bootsector->number_of_heads = cpu_to_le16(heads);
1032 bootsector->hidden_sectors = cpu_to_le32(s->offset_to_bootsector);
1033 bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
1034
1035
1036
1037 bootsector->u.fat16.drive_number = s->offset_to_bootsector == 0 ? 0 : 0x80;
1038 bootsector->u.fat16.signature=0x29;
1039 bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
1040
1041 memcpy(bootsector->u.fat16.volume_label, s->volume_label,
1042 sizeof(bootsector->u.fat16.volume_label));
1043 memcpy(bootsector->u.fat16.fat_type,
1044 s->fat_type == 12 ? "FAT12 " : "FAT16 ", 8);
1045 bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
1046
1047 return 0;
1048}
1049
1050#ifdef DEBUG
1051static BDRVVVFATState *vvv = NULL;
1052#endif
1053
1054static int enable_write_target(BlockDriverState *bs, Error **errp);
1055static int is_consistent(BDRVVVFATState *s);
1056
1057static QemuOptsList runtime_opts = {
1058 .name = "vvfat",
1059 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1060 .desc = {
1061 {
1062 .name = "dir",
1063 .type = QEMU_OPT_STRING,
1064 .help = "Host directory to map to the vvfat device",
1065 },
1066 {
1067 .name = "fat-type",
1068 .type = QEMU_OPT_NUMBER,
1069 .help = "FAT type (12, 16 or 32)",
1070 },
1071 {
1072 .name = "floppy",
1073 .type = QEMU_OPT_BOOL,
1074 .help = "Create a floppy rather than a hard disk image",
1075 },
1076 {
1077 .name = "label",
1078 .type = QEMU_OPT_STRING,
1079 .help = "Use a volume label other than QEMU VVFAT",
1080 },
1081 {
1082 .name = "rw",
1083 .type = QEMU_OPT_BOOL,
1084 .help = "Make the image writable",
1085 },
1086 { }
1087 },
1088};
1089
1090static void vvfat_parse_filename(const char *filename, QDict *options,
1091 Error **errp)
1092{
1093 int fat_type = 0;
1094 bool floppy = false;
1095 bool rw = false;
1096 int i;
1097
1098 if (!strstart(filename, "fat:", NULL)) {
1099 error_setg(errp, "File name string must start with 'fat:'");
1100 return;
1101 }
1102
1103
1104 if (strstr(filename, ":32:")) {
1105 fat_type = 32;
1106 } else if (strstr(filename, ":16:")) {
1107 fat_type = 16;
1108 } else if (strstr(filename, ":12:")) {
1109 fat_type = 12;
1110 }
1111
1112 if (strstr(filename, ":floppy:")) {
1113 floppy = true;
1114 }
1115
1116 if (strstr(filename, ":rw:")) {
1117 rw = true;
1118 }
1119
1120
1121 i = strrchr(filename, ':') - filename;
1122 assert(i >= 3);
1123 if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
1124
1125 filename += i - 1;
1126 } else {
1127 filename += i + 1;
1128 }
1129
1130
1131 qdict_put_str(options, "dir", filename);
1132 qdict_put_int(options, "fat-type", fat_type);
1133 qdict_put_bool(options, "floppy", floppy);
1134 qdict_put_bool(options, "rw", rw);
1135}
1136
1137static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
1138 Error **errp)
1139{
1140 BDRVVVFATState *s = bs->opaque;
1141 int cyls, heads, secs;
1142 bool floppy;
1143 const char *dirname, *label;
1144 QemuOpts *opts;
1145 int ret;
1146
1147#ifdef DEBUG
1148 vvv = s;
1149#endif
1150
1151 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1152 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1153 ret = -EINVAL;
1154 goto fail;
1155 }
1156
1157 dirname = qemu_opt_get(opts, "dir");
1158 if (!dirname) {
1159 error_setg(errp, "vvfat block driver requires a 'dir' option");
1160 ret = -EINVAL;
1161 goto fail;
1162 }
1163
1164 s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
1165 floppy = qemu_opt_get_bool(opts, "floppy", false);
1166
1167 memset(s->volume_label, ' ', sizeof(s->volume_label));
1168 label = qemu_opt_get(opts, "label");
1169 if (label) {
1170 size_t label_length = strlen(label);
1171 if (label_length > 11) {
1172 error_setg(errp, "vvfat label cannot be longer than 11 bytes");
1173 ret = -EINVAL;
1174 goto fail;
1175 }
1176 memcpy(s->volume_label, label, label_length);
1177 } else {
1178 memcpy(s->volume_label, "QEMU VVFAT", 10);
1179 }
1180
1181 if (floppy) {
1182
1183 if (!s->fat_type) {
1184 s->fat_type = 12;
1185 secs = 36;
1186 s->sectors_per_cluster = 2;
1187 } else {
1188 secs = s->fat_type == 12 ? 18 : 36;
1189 s->sectors_per_cluster = 1;
1190 }
1191 cyls = 80;
1192 heads = 2;
1193 } else {
1194
1195 if (!s->fat_type) {
1196 s->fat_type = 16;
1197 }
1198 s->offset_to_bootsector = 0x3f;
1199 cyls = s->fat_type == 12 ? 64 : 1024;
1200 heads = 16;
1201 secs = 63;
1202 }
1203
1204 switch (s->fat_type) {
1205 case 32:
1206 warn_report("FAT32 has not been tested. You are welcome to do so!");
1207 break;
1208 case 16:
1209 case 12:
1210 break;
1211 default:
1212 error_setg(errp, "Valid FAT types are only 12, 16 and 32");
1213 ret = -EINVAL;
1214 goto fail;
1215 }
1216
1217
1218 s->bs = bs;
1219
1220
1221 s->sectors_per_cluster=0x10;
1222
1223 s->current_cluster=0xffffffff;
1224
1225 s->qcow = NULL;
1226 s->qcow_filename = NULL;
1227 s->fat2 = NULL;
1228 s->downcase_short_names = 1;
1229
1230 DLOG(fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
1231 dirname, cyls, heads, secs));
1232
1233 s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
1234 bs->total_sectors = cyls * heads * secs;
1235
1236 if (qemu_opt_get_bool(opts, "rw", false)) {
1237 if (!bdrv_is_read_only(bs)) {
1238 ret = enable_write_target(bs, errp);
1239 if (ret < 0) {
1240 goto fail;
1241 }
1242 } else {
1243 ret = -EPERM;
1244 error_setg(errp,
1245 "Unable to set VVFAT to 'rw' when drive is read-only");
1246 goto fail;
1247 }
1248 } else {
1249 ret = bdrv_apply_auto_read_only(bs, NULL, errp);
1250 if (ret < 0) {
1251 goto fail;
1252 }
1253 }
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, n,
1493 buf + i * 0x200, 0) < 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 BDRV_SECTOR_SIZE, s->cluster_buffer,
1983 0);
1984 if (res < 0) {
1985 return -2;
1986 }
1987 }
1988 }
1989 }
1990 }
1991
1992 ret++;
1993 if (s->used_clusters[cluster_num] & USED_ANY)
1994 return 0;
1995 s->used_clusters[cluster_num] = USED_FILE;
1996
1997 cluster_num = modified_fat_get(s, cluster_num);
1998
1999 if (fat_eof(s, cluster_num))
2000 return ret;
2001 else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
2002 return -1;
2003
2004 offset += s->cluster_size;
2005 }
2006}
2007
2008
2009
2010
2011
2012
2013static int check_directory_consistency(BDRVVVFATState *s,
2014 int cluster_num, const char* path)
2015{
2016 int ret = 0;
2017 unsigned char* cluster = g_malloc(s->cluster_size);
2018 direntry_t* direntries = (direntry_t*)cluster;
2019 mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
2020
2021 long_file_name lfn;
2022 int path_len = strlen(path);
2023 char path2[PATH_MAX + 1];
2024
2025 assert(path_len < PATH_MAX);
2026 pstrcpy(path2, sizeof(path2), path);
2027 path2[path_len] = '/';
2028 path2[path_len + 1] = '\0';
2029
2030 if (mapping) {
2031 const char* basename = get_basename(mapping->path);
2032 const char* basename2 = get_basename(path);
2033
2034 assert(mapping->mode & MODE_DIRECTORY);
2035
2036 assert(mapping->mode & MODE_DELETED);
2037 mapping->mode &= ~MODE_DELETED;
2038
2039 if (strcmp(basename, basename2))
2040 schedule_rename(s, cluster_num, g_strdup(path));
2041 } else
2042
2043 schedule_mkdir(s, cluster_num, g_strdup(path));
2044
2045 lfn_init(&lfn);
2046 do {
2047 int i;
2048 int subret = 0;
2049
2050 ret++;
2051
2052 if (s->used_clusters[cluster_num] & USED_ANY) {
2053 fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
2054 goto fail;
2055 }
2056 s->used_clusters[cluster_num] = USED_DIRECTORY;
2057
2058DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
2059 subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
2060 s->sectors_per_cluster);
2061 if (subret) {
2062 fprintf(stderr, "Error fetching direntries\n");
2063 fail:
2064 g_free(cluster);
2065 return 0;
2066 }
2067
2068 for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
2069 int cluster_count = 0;
2070
2071DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
2072 if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
2073 is_free(direntries + i))
2074 continue;
2075
2076 subret = parse_long_name(&lfn, direntries + i);
2077 if (subret < 0) {
2078 fprintf(stderr, "Error in long name\n");
2079 goto fail;
2080 }
2081 if (subret == 0 || is_free(direntries + i))
2082 continue;
2083
2084 if (fat_chksum(direntries+i) != lfn.checksum) {
2085 subret = parse_short_name(s, &lfn, direntries + i);
2086 if (subret < 0) {
2087 fprintf(stderr, "Error in short name (%d)\n", subret);
2088 goto fail;
2089 }
2090 if (subret > 0 || !strcmp((char*)lfn.name, ".")
2091 || !strcmp((char*)lfn.name, ".."))
2092 continue;
2093 }
2094 lfn.checksum = 0x100;
2095
2096 if (!valid_filename(lfn.name)) {
2097 fprintf(stderr, "Invalid file name\n");
2098 goto fail;
2099 }
2100 if (path_len + 1 + lfn.len >= PATH_MAX) {
2101 fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
2102 goto fail;
2103 }
2104 pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1,
2105 (char*)lfn.name);
2106
2107 if (is_directory(direntries + i)) {
2108 if (begin_of_direntry(direntries + i) == 0) {
2109 DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
2110 goto fail;
2111 }
2112 cluster_count = check_directory_consistency(s,
2113 begin_of_direntry(direntries + i), path2);
2114 if (cluster_count == 0) {
2115 DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
2116 goto fail;
2117 }
2118 } else if (is_file(direntries + i)) {
2119
2120 cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2);
2121 if (cluster_count !=
2122 DIV_ROUND_UP(le32_to_cpu(direntries[i].size), s->cluster_size)) {
2123 DLOG(fprintf(stderr, "Cluster count mismatch\n"));
2124 goto fail;
2125 }
2126 } else
2127 abort();
2128
2129 ret += cluster_count;
2130 }
2131
2132 cluster_num = modified_fat_get(s, cluster_num);
2133 } while(!fat_eof(s, cluster_num));
2134
2135 g_free(cluster);
2136 return ret;
2137}
2138
2139
2140static int is_consistent(BDRVVVFATState* s)
2141{
2142 int i, check;
2143 int used_clusters_count = 0;
2144
2145DLOG(checkpoint());
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159 if (s->fat2 == NULL) {
2160 int size = 0x200 * s->sectors_per_fat;
2161 s->fat2 = g_malloc(size);
2162 memcpy(s->fat2, s->fat.pointer, size);
2163 }
2164 check = vvfat_read(s->bs,
2165 s->offset_to_fat, s->fat2, s->sectors_per_fat);
2166 if (check) {
2167 fprintf(stderr, "Could not copy fat\n");
2168 return 0;
2169 }
2170 assert (s->used_clusters);
2171 for (i = 0; i < sector2cluster(s, s->sector_count); i++)
2172 s->used_clusters[i] &= ~USED_ANY;
2173
2174 clear_commits(s);
2175
2176
2177
2178 if (s->qcow)
2179 for (i = 0; i < s->mapping.next; i++) {
2180 mapping_t* mapping = array_get(&(s->mapping), i);
2181 if (mapping->first_mapping_index < 0)
2182 mapping->mode |= MODE_DELETED;
2183 }
2184
2185 used_clusters_count = check_directory_consistency(s, 0, s->path);
2186 if (used_clusters_count <= 0) {
2187 DLOG(fprintf(stderr, "problem in directory\n"));
2188 return 0;
2189 }
2190
2191 check = s->last_cluster_of_root_directory;
2192 for (i = check; i < sector2cluster(s, s->sector_count); i++) {
2193 if (modified_fat_get(s, i)) {
2194 if(!s->used_clusters[i]) {
2195 DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
2196 return 0;
2197 }
2198 check++;
2199 }
2200
2201 if (s->used_clusters[i] == USED_ALLOCATED) {
2202
2203 DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
2204 return 0;
2205 }
2206 }
2207
2208 if (check != used_clusters_count)
2209 return 0;
2210
2211 return used_clusters_count;
2212}
2213
2214static inline void adjust_mapping_indices(BDRVVVFATState* s,
2215 int offset, int adjust)
2216{
2217 int i;
2218
2219 for (i = 0; i < s->mapping.next; i++) {
2220 mapping_t* mapping = array_get(&(s->mapping), i);
2221
2222#define ADJUST_MAPPING_INDEX(name) \
2223 if (mapping->name >= offset) \
2224 mapping->name += adjust
2225
2226 ADJUST_MAPPING_INDEX(first_mapping_index);
2227 if (mapping->mode & MODE_DIRECTORY)
2228 ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
2229 }
2230}
2231
2232
2233static mapping_t* insert_mapping(BDRVVVFATState* s,
2234 uint32_t begin, uint32_t end)
2235{
2236
2237
2238
2239
2240
2241
2242
2243 int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
2244 mapping_t* mapping = NULL;
2245 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2246
2247 if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
2248 && mapping->begin < begin) {
2249 mapping->end = begin;
2250 index++;
2251 mapping = array_get(&(s->mapping), index);
2252 }
2253 if (index >= s->mapping.next || mapping->begin > begin) {
2254 mapping = array_insert(&(s->mapping), index, 1);
2255 mapping->path = NULL;
2256 adjust_mapping_indices(s, index, +1);
2257 }
2258
2259 mapping->begin = begin;
2260 mapping->end = end;
2261
2262DLOG(mapping_t* next_mapping;
2263assert(index + 1 >= s->mapping.next ||
2264((next_mapping = array_get(&(s->mapping), index + 1)) &&
2265 next_mapping->begin >= end)));
2266
2267 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2268 s->current_mapping = array_get(&(s->mapping),
2269 s->current_mapping - first_mapping);
2270
2271 return mapping;
2272}
2273
2274static int remove_mapping(BDRVVVFATState* s, int mapping_index)
2275{
2276 mapping_t* mapping = array_get(&(s->mapping), mapping_index);
2277 mapping_t* first_mapping = array_get(&(s->mapping), 0);
2278
2279
2280 if (mapping->first_mapping_index < 0) {
2281 g_free(mapping->path);
2282 }
2283
2284
2285 array_remove(&(s->mapping), mapping_index);
2286
2287
2288 adjust_mapping_indices(s, mapping_index, -1);
2289
2290 if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
2291 s->current_mapping = array_get(&(s->mapping),
2292 s->current_mapping - first_mapping);
2293
2294 return 0;
2295}
2296
2297static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust)
2298{
2299 int i;
2300 for (i = 0; i < s->mapping.next; i++) {
2301 mapping_t* mapping = array_get(&(s->mapping), i);
2302 if (mapping->dir_index >= offset)
2303 mapping->dir_index += adjust;
2304 if ((mapping->mode & MODE_DIRECTORY) &&
2305 mapping->info.dir.first_dir_index >= offset)
2306 mapping->info.dir.first_dir_index += adjust;
2307 }
2308}
2309
2310static direntry_t* insert_direntries(BDRVVVFATState* s,
2311 int dir_index, int count)
2312{
2313
2314
2315
2316
2317 direntry_t* result = array_insert(&(s->directory), dir_index, count);
2318 if (result == NULL)
2319 return NULL;
2320 adjust_dirindices(s, dir_index, count);
2321 return result;
2322}
2323
2324static int remove_direntries(BDRVVVFATState* s, int dir_index, int count)
2325{
2326 int ret = array_remove_slice(&(s->directory), dir_index, count);
2327 if (ret)
2328 return ret;
2329 adjust_dirindices(s, dir_index, -count);
2330 return 0;
2331}
2332
2333
2334
2335
2336
2337
2338
2339static int commit_mappings(BDRVVVFATState* s,
2340 uint32_t first_cluster, int dir_index)
2341{
2342 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2343 direntry_t* direntry = array_get(&(s->directory), dir_index);
2344 uint32_t cluster = first_cluster;
2345
2346 vvfat_close_current_file(s);
2347
2348 assert(mapping);
2349 assert(mapping->begin == first_cluster);
2350 mapping->first_mapping_index = -1;
2351 mapping->dir_index = dir_index;
2352 mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
2353 MODE_DIRECTORY : MODE_NORMAL;
2354
2355 while (!fat_eof(s, cluster)) {
2356 uint32_t c, c1;
2357
2358 for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1;
2359 c = c1, c1 = modified_fat_get(s, c1));
2360
2361 c++;
2362 if (c > mapping->end) {
2363 int index = array_index(&(s->mapping), mapping);
2364 int i, max_i = s->mapping.next - index;
2365 for (i = 1; i < max_i && mapping[i].begin < c; i++);
2366 while (--i > 0)
2367 remove_mapping(s, index + 1);
2368 }
2369 assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
2370 || mapping[1].begin >= c);
2371 mapping->end = c;
2372
2373 if (!fat_eof(s, c1)) {
2374 int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next);
2375 mapping_t* next_mapping = i >= s->mapping.next ? NULL :
2376 array_get(&(s->mapping), i);
2377
2378 if (next_mapping == NULL || next_mapping->begin > c1) {
2379 int i1 = array_index(&(s->mapping), mapping);
2380
2381 next_mapping = insert_mapping(s, c1, c1+1);
2382
2383 if (c1 < c)
2384 i1++;
2385 mapping = array_get(&(s->mapping), i1);
2386 }
2387
2388 next_mapping->dir_index = mapping->dir_index;
2389 next_mapping->first_mapping_index =
2390 mapping->first_mapping_index < 0 ?
2391 array_index(&(s->mapping), mapping) :
2392 mapping->first_mapping_index;
2393 next_mapping->path = mapping->path;
2394 next_mapping->mode = mapping->mode;
2395 next_mapping->read_only = mapping->read_only;
2396 if (mapping->mode & MODE_DIRECTORY) {
2397 next_mapping->info.dir.parent_mapping_index =
2398 mapping->info.dir.parent_mapping_index;
2399 next_mapping->info.dir.first_dir_index =
2400 mapping->info.dir.first_dir_index +
2401 0x10 * s->sectors_per_cluster *
2402 (mapping->end - mapping->begin);
2403 } else
2404 next_mapping->info.file.offset = mapping->info.file.offset +
2405 mapping->end - mapping->begin;
2406
2407 mapping = next_mapping;
2408 }
2409
2410 cluster = c1;
2411 }
2412
2413 return 0;
2414}
2415
2416static int commit_direntries(BDRVVVFATState* s,
2417 int dir_index, int parent_mapping_index)
2418{
2419 direntry_t* direntry = array_get(&(s->directory), dir_index);
2420 uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
2421 mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
2422 int factor = 0x10 * s->sectors_per_cluster;
2423 int old_cluster_count, new_cluster_count;
2424 int current_dir_index;
2425 int first_dir_index;
2426 int ret, i;
2427 uint32_t c;
2428
2429 assert(direntry);
2430 assert(mapping);
2431 assert(mapping->begin == first_cluster);
2432 assert(mapping->info.dir.first_dir_index < s->directory.next);
2433 assert(mapping->mode & MODE_DIRECTORY);
2434 assert(dir_index == 0 || is_directory(direntry));
2435
2436 DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n",
2437 mapping->path, parent_mapping_index));
2438
2439 current_dir_index = mapping->info.dir.first_dir_index;
2440 first_dir_index = current_dir_index;
2441 mapping->info.dir.parent_mapping_index = parent_mapping_index;
2442
2443 if (first_cluster == 0) {
2444 old_cluster_count = new_cluster_count =
2445 s->last_cluster_of_root_directory;
2446 } else {
2447 for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2448 c = fat_get(s, c))
2449 old_cluster_count++;
2450
2451 for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
2452 c = modified_fat_get(s, c))
2453 new_cluster_count++;
2454 }
2455
2456 if (new_cluster_count > old_cluster_count) {
2457 if (insert_direntries(s,
2458 current_dir_index + factor * old_cluster_count,
2459 factor * (new_cluster_count - old_cluster_count)) == NULL)
2460 return -1;
2461 } else if (new_cluster_count < old_cluster_count)
2462 remove_direntries(s,
2463 current_dir_index + factor * new_cluster_count,
2464 factor * (old_cluster_count - new_cluster_count));
2465
2466 for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
2467 direntry_t *first_direntry;
2468 void* direntry = array_get(&(s->directory), current_dir_index);
2469 int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
2470 s->sectors_per_cluster);
2471 if (ret)
2472 return ret;
2473
2474
2475 first_direntry = (direntry_t*) s->directory.pointer;
2476 assert(!memcmp(first_direntry->name, s->volume_label, 11));
2477
2478 current_dir_index += factor;
2479 }
2480
2481 ret = commit_mappings(s, first_cluster, dir_index);
2482 if (ret)
2483 return ret;
2484
2485
2486 for (i = 0; i < factor * new_cluster_count; i++) {
2487 direntry = array_get(&(s->directory), first_dir_index + i);
2488 if (is_directory(direntry) && !is_dot(direntry)) {
2489 mapping = find_mapping_for_cluster(s, first_cluster);
2490 if (mapping == NULL) {
2491 return -1;
2492 }
2493 assert(mapping->mode & MODE_DIRECTORY);
2494 ret = commit_direntries(s, first_dir_index + i,
2495 array_index(&(s->mapping), mapping));
2496 if (ret)
2497 return ret;
2498 }
2499 }
2500
2501 return 0;
2502}
2503
2504
2505
2506static int commit_one_file(BDRVVVFATState* s,
2507 int dir_index, uint32_t offset)
2508{
2509 direntry_t* direntry = array_get(&(s->directory), dir_index);
2510 uint32_t c = begin_of_direntry(direntry);
2511 uint32_t first_cluster = c;
2512 mapping_t* mapping = find_mapping_for_cluster(s, c);
2513 uint32_t size = filesize_of_direntry(direntry);
2514 char *cluster;
2515 uint32_t i;
2516 int fd = 0;
2517
2518 assert(offset < size);
2519 assert((offset % s->cluster_size) == 0);
2520
2521 if (mapping == NULL) {
2522 return -1;
2523 }
2524
2525 for (i = s->cluster_size; i < offset; i += s->cluster_size)
2526 c = modified_fat_get(s, c);
2527
2528 fd = qemu_open_old(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
2529 if (fd < 0) {
2530 fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
2531 strerror(errno), errno);
2532 return fd;
2533 }
2534 if (offset > 0) {
2535 if (lseek(fd, offset, SEEK_SET) != offset) {
2536 qemu_close(fd);
2537 return -3;
2538 }
2539 }
2540
2541 cluster = g_malloc(s->cluster_size);
2542
2543 while (offset < size) {
2544 uint32_t c1;
2545 int rest_size = (size - offset > s->cluster_size ?
2546 s->cluster_size : size - offset);
2547 int ret;
2548
2549 c1 = modified_fat_get(s, c);
2550
2551 assert((size - offset == 0 && fat_eof(s, c)) ||
2552 (size > offset && c >=2 && !fat_eof(s, c)));
2553
2554 ret = vvfat_read(s->bs, cluster2sector(s, c),
2555 (uint8_t*)cluster, DIV_ROUND_UP(rest_size, 0x200));
2556
2557 if (ret < 0) {
2558 qemu_close(fd);
2559 g_free(cluster);
2560 return ret;
2561 }
2562
2563 if (write(fd, cluster, rest_size) < 0) {
2564 qemu_close(fd);
2565 g_free(cluster);
2566 return -2;
2567 }
2568
2569 offset += rest_size;
2570 c = c1;
2571 }
2572
2573 if (ftruncate(fd, size)) {
2574 perror("ftruncate()");
2575 qemu_close(fd);
2576 g_free(cluster);
2577 return -4;
2578 }
2579 qemu_close(fd);
2580 g_free(cluster);
2581
2582 return commit_mappings(s, first_cluster, dir_index);
2583}
2584
2585#ifdef DEBUG
2586
2587static void check1(BDRVVVFATState* s)
2588{
2589 int i;
2590 for (i = 0; i < s->mapping.next; i++) {
2591 mapping_t* mapping = array_get(&(s->mapping), i);
2592 if (mapping->mode & MODE_DELETED) {
2593 fprintf(stderr, "deleted\n");
2594 continue;
2595 }
2596 assert(mapping->dir_index < s->directory.next);
2597 direntry_t* direntry = array_get(&(s->directory), mapping->dir_index);
2598 assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
2599 if (mapping->mode & MODE_DIRECTORY) {
2600 assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
2601 assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0);
2602 }
2603 }
2604}
2605
2606
2607static void check2(BDRVVVFATState* s)
2608{
2609 int i;
2610 int first_mapping = -1;
2611
2612 for (i = 0; i < s->directory.next; i++) {
2613 direntry_t* direntry = array_get(&(s->directory), i);
2614
2615 if (is_short_name(direntry) && begin_of_direntry(direntry)) {
2616 mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry));
2617 assert(mapping);
2618 assert(mapping->dir_index == i || is_dot(direntry));
2619 assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry));
2620 }
2621
2622 if ((i % (0x10 * s->sectors_per_cluster)) == 0) {
2623
2624 int j, count = 0;
2625
2626 for (j = 0; j < s->mapping.next; j++) {
2627 mapping_t* mapping = array_get(&(s->mapping), j);
2628 if (mapping->mode & MODE_DELETED)
2629 continue;
2630 if (mapping->mode & MODE_DIRECTORY) {
2631 if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) {
2632 assert(++count == 1);
2633 if (mapping->first_mapping_index == -1)
2634 first_mapping = array_index(&(s->mapping), mapping);
2635 else
2636 assert(first_mapping == mapping->first_mapping_index);
2637 if (mapping->info.dir.parent_mapping_index < 0)
2638 assert(j == 0);
2639 else {
2640 mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index);
2641 assert(parent->mode & MODE_DIRECTORY);
2642 assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index);
2643 }
2644 }
2645 }
2646 }
2647 if (count == 0)
2648 first_mapping = -1;
2649 }
2650 }
2651}
2652#endif
2653
2654static int handle_renames_and_mkdirs(BDRVVVFATState* s)
2655{
2656 int i;
2657
2658#ifdef DEBUG
2659 fprintf(stderr, "handle_renames\n");
2660 for (i = 0; i < s->commits.next; i++) {
2661 commit_t* commit = array_get(&(s->commits), i);
2662 fprintf(stderr, "%d, %s (%u, %d)\n", i,
2663 commit->path ? commit->path : "(null)",
2664 commit->param.rename.cluster, commit->action);
2665 }
2666#endif
2667
2668 for (i = 0; i < s->commits.next;) {
2669 commit_t* commit = array_get(&(s->commits), i);
2670 if (commit->action == ACTION_RENAME) {
2671 mapping_t* mapping = find_mapping_for_cluster(s,
2672 commit->param.rename.cluster);
2673 char *old_path;
2674
2675 if (mapping == NULL) {
2676 return -1;
2677 }
2678 old_path = mapping->path;
2679 assert(commit->path);
2680 mapping->path = commit->path;
2681 if (rename(old_path, mapping->path))
2682 return -2;
2683
2684 if (mapping->mode & MODE_DIRECTORY) {
2685 int l1 = strlen(mapping->path);
2686 int l2 = strlen(old_path);
2687 int diff = l1 - l2;
2688 direntry_t* direntry = array_get(&(s->directory),
2689 mapping->info.dir.first_dir_index);
2690 uint32_t c = mapping->begin;
2691 int i = 0;
2692
2693
2694 while (!fat_eof(s, c)) {
2695 do {
2696 direntry_t* d = direntry + i;
2697
2698 if (is_file(d) || (is_directory(d) && !is_dot(d))) {
2699 int l;
2700 char *new_path;
2701 mapping_t* m = find_mapping_for_cluster(s,
2702 begin_of_direntry(d));
2703 if (m == NULL) {
2704 return -1;
2705 }
2706 l = strlen(m->path);
2707 new_path = g_malloc(l + diff + 1);
2708
2709 assert(!strncmp(m->path, mapping->path, l2));
2710
2711 pstrcpy(new_path, l + diff + 1, mapping->path);
2712 pstrcpy(new_path + l1, l + diff + 1 - l1,
2713 m->path + l2);
2714
2715 schedule_rename(s, m->begin, new_path);
2716 }
2717 i++;
2718 } while((i % (0x10 * s->sectors_per_cluster)) != 0);
2719 c = fat_get(s, c);
2720 }
2721 }
2722
2723 g_free(old_path);
2724 array_remove(&(s->commits), i);
2725 continue;
2726 } else if (commit->action == ACTION_MKDIR) {
2727 mapping_t* mapping;
2728 int j, parent_path_len;
2729
2730 if (g_mkdir(commit->path, 0755)) {
2731 return -5;
2732 }
2733
2734 mapping = insert_mapping(s, commit->param.mkdir.cluster,
2735 commit->param.mkdir.cluster + 1);
2736 if (mapping == NULL)
2737 return -6;
2738
2739 mapping->mode = MODE_DIRECTORY;
2740 mapping->read_only = 0;
2741 mapping->path = commit->path;
2742 j = s->directory.next;
2743 assert(j);
2744 insert_direntries(s, s->directory.next,
2745 0x10 * s->sectors_per_cluster);
2746 mapping->info.dir.first_dir_index = j;
2747
2748 parent_path_len = strlen(commit->path)
2749 - strlen(get_basename(commit->path)) - 1;
2750 for (j = 0; j < s->mapping.next; j++) {
2751 mapping_t* m = array_get(&(s->mapping), j);
2752 if (m->first_mapping_index < 0 && m != mapping &&
2753 !strncmp(m->path, mapping->path, parent_path_len) &&
2754 strlen(m->path) == parent_path_len)
2755 break;
2756 }
2757 assert(j < s->mapping.next);
2758 mapping->info.dir.parent_mapping_index = j;
2759
2760 array_remove(&(s->commits), i);
2761 continue;
2762 }
2763
2764 i++;
2765 }
2766 return 0;
2767}
2768
2769
2770
2771
2772static int handle_commits(BDRVVVFATState* s)
2773{
2774 int i, fail = 0;
2775
2776 vvfat_close_current_file(s);
2777
2778 for (i = 0; !fail && i < s->commits.next; i++) {
2779 commit_t* commit = array_get(&(s->commits), i);
2780 switch(commit->action) {
2781 case ACTION_RENAME: case ACTION_MKDIR:
2782 abort();
2783 fail = -2;
2784 break;
2785 case ACTION_WRITEOUT: {
2786#ifndef NDEBUG
2787
2788 direntry_t* entry = array_get(&(s->directory),
2789 commit->param.writeout.dir_index);
2790 uint32_t begin = begin_of_direntry(entry);
2791 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2792#endif
2793
2794 assert(mapping);
2795 assert(mapping->begin == begin);
2796 assert(commit->path == NULL);
2797
2798 if (commit_one_file(s, commit->param.writeout.dir_index,
2799 commit->param.writeout.modified_offset))
2800 fail = -3;
2801
2802 break;
2803 }
2804 case ACTION_NEW_FILE: {
2805 int begin = commit->param.new_file.first_cluster;
2806 mapping_t* mapping = find_mapping_for_cluster(s, begin);
2807 direntry_t* entry;
2808 int i;
2809
2810
2811 for (i = 0; i < s->directory.next; i++) {
2812 entry = array_get(&(s->directory), i);
2813 if (is_file(entry) && begin_of_direntry(entry) == begin)
2814 break;
2815 }
2816
2817 if (i >= s->directory.next) {
2818 fail = -6;
2819 continue;
2820 }
2821
2822
2823 if (mapping && mapping->begin != begin) {
2824 mapping->end = begin;
2825 mapping = NULL;
2826 }
2827 if (mapping == NULL) {
2828 mapping = insert_mapping(s, begin, begin+1);
2829 }
2830
2831 assert(commit->path);
2832 mapping->path = commit->path;
2833 mapping->read_only = 0;
2834 mapping->mode = MODE_NORMAL;
2835 mapping->info.file.offset = 0;
2836
2837 if (commit_one_file(s, i, 0))
2838 fail = -7;
2839
2840 break;
2841 }
2842 default:
2843 abort();
2844 }
2845 }
2846 if (i > 0 && array_remove_slice(&(s->commits), 0, i))
2847 return -1;
2848 return fail;
2849}
2850
2851static int handle_deletes(BDRVVVFATState* s)
2852{
2853 int i, deferred = 1, deleted = 1;
2854
2855
2856
2857 while (deferred && deleted) {
2858 deferred = 0;
2859 deleted = 0;
2860
2861 for (i = 1; i < s->mapping.next; i++) {
2862 mapping_t* mapping = array_get(&(s->mapping), i);
2863 if (mapping->mode & MODE_DELETED) {
2864 direntry_t* entry = array_get(&(s->directory),
2865 mapping->dir_index);
2866
2867 if (is_free(entry)) {
2868
2869 if (mapping->mode & MODE_DIRECTORY) {
2870 int j, next_dir_index = s->directory.next,
2871 first_dir_index = mapping->info.dir.first_dir_index;
2872
2873 if (rmdir(mapping->path) < 0) {
2874 if (errno == ENOTEMPTY) {
2875 deferred++;
2876 continue;
2877 } else
2878 return -5;
2879 }
2880
2881 for (j = 1; j < s->mapping.next; j++) {
2882 mapping_t* m = array_get(&(s->mapping), j);
2883 if (m->mode & MODE_DIRECTORY &&
2884 m->info.dir.first_dir_index >
2885 first_dir_index &&
2886 m->info.dir.first_dir_index <
2887 next_dir_index)
2888 next_dir_index =
2889 m->info.dir.first_dir_index;
2890 }
2891 remove_direntries(s, first_dir_index,
2892 next_dir_index - first_dir_index);
2893
2894 deleted++;
2895 }
2896 } else {
2897 if (unlink(mapping->path))
2898 return -4;
2899 deleted++;
2900 }
2901 DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
2902 remove_mapping(s, i);
2903 }
2904 }
2905 }
2906
2907 return 0;
2908}
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918static int do_commit(BDRVVVFATState* s)
2919{
2920 int ret = 0;
2921
2922
2923 if (s->commits.next == 0)
2924 return 0;
2925
2926 vvfat_close_current_file(s);
2927
2928 ret = handle_renames_and_mkdirs(s);
2929 if (ret) {
2930 fprintf(stderr, "Error handling renames (%d)\n", ret);
2931 abort();
2932 return ret;
2933 }
2934
2935
2936 memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
2937
2938
2939 ret = commit_direntries(s, 0, -1);
2940 if (ret) {
2941 fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
2942 abort();
2943 return ret;
2944 }
2945
2946 ret = handle_commits(s);
2947 if (ret) {
2948 fprintf(stderr, "Error handling commits (%d)\n", ret);
2949 abort();
2950 return ret;
2951 }
2952
2953 ret = handle_deletes(s);
2954 if (ret) {
2955 fprintf(stderr, "Error deleting\n");
2956 abort();
2957 return ret;
2958 }
2959
2960 bdrv_make_empty(s->qcow, NULL);
2961
2962 memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
2963
2964DLOG(checkpoint());
2965 return 0;
2966}
2967
2968static int try_commit(BDRVVVFATState* s)
2969{
2970 vvfat_close_current_file(s);
2971DLOG(checkpoint());
2972 if(!is_consistent(s))
2973 return -1;
2974 return do_commit(s);
2975}
2976
2977static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
2978 const uint8_t *buf, int nb_sectors)
2979{
2980 BDRVVVFATState *s = bs->opaque;
2981 int i, ret;
2982 int first_cluster, last_cluster;
2983
2984DLOG(checkpoint());
2985
2986
2987 if (s->qcow == NULL) {
2988 return -EACCES;
2989 }
2990
2991 vvfat_close_current_file(s);
2992
2993 if (sector_num == s->offset_to_bootsector && nb_sectors == 1) {
2994
2995
2996
2997
2998 unsigned char *bootsector = s->first_sectors
2999 + s->offset_to_bootsector * 0x200;
3000
3001
3002
3003
3004 const int reserved1_offset = offsetof(bootsector_t, u.fat16.reserved1);
3005
3006 for (i = 0; i < 0x200; i++) {
3007 if (i != reserved1_offset && bootsector[i] != buf[i]) {
3008 fprintf(stderr, "Tried to write to protected bootsector\n");
3009 return -1;
3010 }
3011 }
3012
3013
3014 bootsector[reserved1_offset] = buf[reserved1_offset];
3015 return 0;
3016 }
3017
3018
3019
3020
3021
3022 if (sector_num < s->offset_to_fat)
3023 return -1;
3024
3025
3026
3027
3028
3029 first_cluster = sector2cluster(s, sector_num);
3030 last_cluster = sector2cluster(s, sector_num + nb_sectors - 1);
3031
3032 for (i = first_cluster; i <= last_cluster;) {
3033 mapping_t *mapping = NULL;
3034
3035 if (i >= 0) {
3036 mapping = find_mapping_for_cluster(s, i);
3037 }
3038
3039 if (mapping) {
3040 if (mapping->read_only) {
3041 fprintf(stderr, "Tried to write to write-protected file %s\n",
3042 mapping->path);
3043 return -1;
3044 }
3045
3046 if (mapping->mode & MODE_DIRECTORY) {
3047 int begin = cluster2sector(s, i);
3048 int end = begin + s->sectors_per_cluster, k;
3049 int dir_index;
3050 const direntry_t* direntries;
3051 long_file_name lfn;
3052
3053 lfn_init(&lfn);
3054
3055 if (begin < sector_num)
3056 begin = sector_num;
3057 if (end > sector_num + nb_sectors)
3058 end = sector_num + nb_sectors;
3059 dir_index = mapping->dir_index +
3060 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
3061 direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
3062
3063 for (k = 0; k < (end - begin) * 0x10; k++) {
3064
3065 if (is_short_name(direntries + k) &&
3066 (direntries[k].attributes & 1)) {
3067 if (memcmp(direntries + k,
3068 array_get(&(s->directory), dir_index + k),
3069 sizeof(direntry_t))) {
3070 warn_report("tried to write to write-protected "
3071 "file");
3072 return -1;
3073 }
3074 }
3075 }
3076 }
3077 i = mapping->end;
3078 } else {
3079 i++;
3080 }
3081 }
3082
3083
3084
3085
3086DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
3087 ret = bdrv_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE,
3088 nb_sectors * BDRV_SECTOR_SIZE, buf, 0);
3089 if (ret < 0) {
3090 fprintf(stderr, "Error writing to qcow backend\n");
3091 return ret;
3092 }
3093
3094 for (i = first_cluster; i <= last_cluster; i++) {
3095 if (i >= 0) {
3096 s->used_clusters[i] |= USED_ALLOCATED;
3097 }
3098 }
3099
3100DLOG(checkpoint());
3101
3102 try_commit(s);
3103
3104DLOG(checkpoint());
3105 return 0;
3106}
3107
3108static int coroutine_fn
3109vvfat_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
3110 QEMUIOVector *qiov, BdrvRequestFlags flags)
3111{
3112 int ret;
3113 BDRVVVFATState *s = bs->opaque;
3114 uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
3115 int nb_sectors = bytes >> BDRV_SECTOR_BITS;
3116 void *buf;
3117
3118 assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
3119 assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
3120
3121 buf = g_try_malloc(bytes);
3122 if (bytes && buf == NULL) {
3123 return -ENOMEM;
3124 }
3125 qemu_iovec_to_buf(qiov, 0, buf, bytes);
3126
3127 qemu_co_mutex_lock(&s->lock);
3128 ret = vvfat_write(bs, sector_num, buf, nb_sectors);
3129 qemu_co_mutex_unlock(&s->lock);
3130
3131 g_free(buf);
3132
3133 return ret;
3134}
3135
3136static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs,
3137 bool want_zero, int64_t offset,
3138 int64_t bytes, int64_t *n,
3139 int64_t *map,
3140 BlockDriverState **file)
3141{
3142 *n = bytes;
3143 return BDRV_BLOCK_DATA;
3144}
3145
3146static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format,
3147 int *child_flags, QDict *child_options,
3148 int parent_flags, QDict *parent_options)
3149{
3150 qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
3151 qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off");
3152 qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on");
3153}
3154
3155static BdrvChildClass child_vvfat_qcow;
3156
3157static int enable_write_target(BlockDriverState *bs, Error **errp)
3158{
3159 BDRVVVFATState *s = bs->opaque;
3160 BlockDriver *bdrv_qcow = NULL;
3161 QemuOpts *opts = NULL;
3162 int ret;
3163 int size = sector2cluster(s, s->sector_count);
3164 QDict *options;
3165
3166 s->used_clusters = g_malloc0(size);
3167
3168 array_init(&(s->commits), sizeof(commit_t));
3169
3170 s->qcow_filename = create_tmp_file(errp);
3171 if (!s->qcow_filename) {
3172 ret = -ENOENT;
3173 goto err;
3174 }
3175
3176 bdrv_qcow = bdrv_find_format("qcow");
3177 if (!bdrv_qcow) {
3178 error_setg(errp, "Failed to locate qcow driver");
3179 ret = -ENOENT;
3180 goto err;
3181 }
3182
3183 opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
3184 qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
3185 bs->total_sectors * BDRV_SECTOR_SIZE, &error_abort);
3186 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
3187
3188 ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
3189 qemu_opts_del(opts);
3190 if (ret < 0) {
3191 goto err;
3192 }
3193
3194 options = qdict_new();
3195 qdict_put_str(options, "write-target.driver", "qcow");
3196 s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
3197 &child_vvfat_qcow,
3198 BDRV_CHILD_DATA | BDRV_CHILD_METADATA,
3199 false, errp);
3200 qobject_unref(options);
3201 if (!s->qcow) {
3202 ret = -EINVAL;
3203 goto err;
3204 }
3205
3206#ifndef _WIN32
3207 unlink(s->qcow_filename);
3208#endif
3209
3210 return 0;
3211
3212err:
3213 return ret;
3214}
3215
3216static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
3217 BdrvChildRole role,
3218 BlockReopenQueue *reopen_queue,
3219 uint64_t perm, uint64_t shared,
3220 uint64_t *nperm, uint64_t *nshared)
3221{
3222 assert(role & BDRV_CHILD_DATA);
3223
3224 *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
3225 *nshared = BLK_PERM_WRITE_UNCHANGED;
3226}
3227
3228static void vvfat_close(BlockDriverState *bs)
3229{
3230 BDRVVVFATState *s = bs->opaque;
3231
3232 vvfat_close_current_file(s);
3233 array_free(&(s->fat));
3234 array_free(&(s->directory));
3235 array_free(&(s->mapping));
3236 g_free(s->cluster_buffer);
3237
3238 if (s->qcow) {
3239 migrate_del_blocker(s->migration_blocker);
3240 error_free(s->migration_blocker);
3241 }
3242}
3243
3244static const char *const vvfat_strong_runtime_opts[] = {
3245 "dir",
3246 "fat-type",
3247 "floppy",
3248 "label",
3249 "rw",
3250
3251 NULL
3252};
3253
3254static BlockDriver bdrv_vvfat = {
3255 .format_name = "vvfat",
3256 .protocol_name = "fat",
3257 .instance_size = sizeof(BDRVVVFATState),
3258
3259 .bdrv_parse_filename = vvfat_parse_filename,
3260 .bdrv_file_open = vvfat_open,
3261 .bdrv_refresh_limits = vvfat_refresh_limits,
3262 .bdrv_close = vvfat_close,
3263 .bdrv_child_perm = vvfat_child_perm,
3264
3265 .bdrv_co_preadv = vvfat_co_preadv,
3266 .bdrv_co_pwritev = vvfat_co_pwritev,
3267 .bdrv_co_block_status = vvfat_co_block_status,
3268
3269 .strong_runtime_opts = vvfat_strong_runtime_opts,
3270};
3271
3272static void bdrv_vvfat_init(void)
3273{
3274 child_vvfat_qcow = child_of_bds;
3275 child_vvfat_qcow.inherit_options = vvfat_qcow_options;
3276 bdrv_register(&bdrv_vvfat);
3277}
3278
3279block_init(bdrv_vvfat_init);
3280
3281#ifdef DEBUG
3282static void checkpoint(void)
3283{
3284 assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
3285 check1(vvv);
3286 check2(vvv);
3287 assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
3288}
3289#endif
3290