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7ad9be64 | 1 | /* vim:set shiftwidth=4 ts=4: */ |
de167e41 FB |
2 | /* |
3 | * QEMU Block driver for virtual VFAT (shadows a local directory) | |
5fafdf24 | 4 | * |
a046433a | 5 | * Copyright (c) 2004,2005 Johannes E. Schindelin |
5fafdf24 | 6 | * |
de167e41 FB |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
80c71a24 | 25 | #include "qemu/osdep.h" |
de167e41 | 26 | #include <dirent.h> |
da34e65c | 27 | #include "qapi/error.h" |
737e150e | 28 | #include "block/block_int.h" |
1de7afc9 | 29 | #include "qemu/module.h" |
caf71f86 | 30 | #include "migration/migration.h" |
7ad9be64 KW |
31 | #include "qapi/qmp/qint.h" |
32 | #include "qapi/qmp/qbool.h" | |
d49b6836 | 33 | #include "qapi/qmp/qstring.h" |
f348b6d1 | 34 | #include "qemu/cutils.h" |
de167e41 | 35 | |
a046433a FB |
36 | #ifndef S_IWGRP |
37 | #define S_IWGRP 0 | |
38 | #endif | |
39 | #ifndef S_IWOTH | |
40 | #define S_IWOTH 0 | |
41 | #endif | |
42 | ||
43 | /* TODO: add ":bootsector=blabla.img:" */ | |
44 | /* LATER TODO: add automatic boot sector generation from | |
45 | BOOTEASY.ASM and Ranish Partition Manager | |
5fafdf24 | 46 | Note that DOS assumes the system files to be the first files in the |
a046433a FB |
47 | file system (test if the boot sector still relies on that fact)! */ |
48 | /* MAYBE TODO: write block-visofs.c */ | |
49 | /* TODO: call try_commit() only after a timeout */ | |
50 | ||
51 | /* #define DEBUG */ | |
52 | ||
53 | #ifdef DEBUG | |
54 | ||
55 | #define DLOG(a) a | |
56 | ||
3f47aa8c | 57 | static void checkpoint(void); |
de167e41 | 58 | |
a046433a FB |
59 | #ifdef __MINGW32__ |
60 | void nonono(const char* file, int line, const char* msg) { | |
61 | fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg); | |
62 | exit(-5); | |
63 | } | |
64 | #undef assert | |
6bcb76c3 | 65 | #define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0) |
a046433a FB |
66 | #endif |
67 | ||
68 | #else | |
69 | ||
70 | #define DLOG(a) | |
71 | ||
72 | #endif | |
de167e41 FB |
73 | |
74 | /* dynamic array functions */ | |
c227f099 | 75 | typedef struct array_t { |
de167e41 FB |
76 | char* pointer; |
77 | unsigned int size,next,item_size; | |
c227f099 | 78 | } array_t; |
de167e41 | 79 | |
c227f099 | 80 | static inline void array_init(array_t* array,unsigned int item_size) |
de167e41 | 81 | { |
511d2b14 | 82 | array->pointer = NULL; |
de167e41 FB |
83 | array->size=0; |
84 | array->next=0; | |
85 | array->item_size=item_size; | |
86 | } | |
87 | ||
c227f099 | 88 | static inline void array_free(array_t* array) |
de167e41 | 89 | { |
ce137829 | 90 | g_free(array->pointer); |
de167e41 FB |
91 | array->size=array->next=0; |
92 | } | |
93 | ||
a046433a | 94 | /* does not automatically grow */ |
c227f099 | 95 | static inline void* array_get(array_t* array,unsigned int index) { |
a046433a FB |
96 | assert(index < array->next); |
97 | return array->pointer + index * array->item_size; | |
98 | } | |
99 | ||
c227f099 | 100 | static inline int array_ensure_allocated(array_t* array, int index) |
a046433a FB |
101 | { |
102 | if((index + 1) * array->item_size > array->size) { | |
103 | int new_size = (index + 32) * array->item_size; | |
7267c094 | 104 | array->pointer = g_realloc(array->pointer, new_size); |
a046433a FB |
105 | if (!array->pointer) |
106 | return -1; | |
107 | array->size = new_size; | |
108 | array->next = index + 1; | |
de167e41 | 109 | } |
a046433a FB |
110 | |
111 | return 0; | |
de167e41 FB |
112 | } |
113 | ||
c227f099 | 114 | static inline void* array_get_next(array_t* array) { |
a046433a FB |
115 | unsigned int next = array->next; |
116 | void* result; | |
117 | ||
118 | if (array_ensure_allocated(array, next) < 0) | |
119 | return NULL; | |
120 | ||
121 | array->next = next + 1; | |
122 | result = array_get(array, next); | |
123 | ||
de167e41 FB |
124 | return result; |
125 | } | |
126 | ||
c227f099 | 127 | static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) { |
de167e41 FB |
128 | if((array->next+count)*array->item_size>array->size) { |
129 | int increment=count*array->item_size; | |
7267c094 | 130 | array->pointer=g_realloc(array->pointer,array->size+increment); |
de167e41 | 131 | if(!array->pointer) |
511d2b14 | 132 | return NULL; |
de167e41 FB |
133 | array->size+=increment; |
134 | } | |
135 | memmove(array->pointer+(index+count)*array->item_size, | |
136 | array->pointer+index*array->item_size, | |
137 | (array->next-index)*array->item_size); | |
138 | array->next+=count; | |
139 | return array->pointer+index*array->item_size; | |
140 | } | |
141 | ||
142 | /* this performs a "roll", so that the element which was at index_from becomes | |
143 | * index_to, but the order of all other elements is preserved. */ | |
c227f099 | 144 | static inline int array_roll(array_t* array,int index_to,int index_from,int count) |
de167e41 FB |
145 | { |
146 | char* buf; | |
147 | char* from; | |
148 | char* to; | |
149 | int is; | |
150 | ||
151 | if(!array || | |
152 | index_to<0 || index_to>=array->next || | |
153 | index_from<0 || index_from>=array->next) | |
154 | return -1; | |
3b46e624 | 155 | |
de167e41 FB |
156 | if(index_to==index_from) |
157 | return 0; | |
158 | ||
159 | is=array->item_size; | |
160 | from=array->pointer+index_from*is; | |
161 | to=array->pointer+index_to*is; | |
7267c094 | 162 | buf=g_malloc(is*count); |
de167e41 FB |
163 | memcpy(buf,from,is*count); |
164 | ||
165 | if(index_to<index_from) | |
166 | memmove(to+is*count,to,from-to); | |
167 | else | |
168 | memmove(from,from+is*count,to-from); | |
3b46e624 | 169 | |
de167e41 FB |
170 | memcpy(to,buf,is*count); |
171 | ||
ce137829 | 172 | g_free(buf); |
de167e41 FB |
173 | |
174 | return 0; | |
175 | } | |
176 | ||
c227f099 | 177 | static inline int array_remove_slice(array_t* array,int index, int count) |
de167e41 | 178 | { |
a046433a FB |
179 | assert(index >=0); |
180 | assert(count > 0); | |
181 | assert(index + count <= array->next); | |
182 | if(array_roll(array,array->next-1,index,count)) | |
de167e41 | 183 | return -1; |
a046433a | 184 | array->next -= count; |
de167e41 FB |
185 | return 0; |
186 | } | |
187 | ||
c227f099 | 188 | static int array_remove(array_t* array,int index) |
a046433a FB |
189 | { |
190 | return array_remove_slice(array, index, 1); | |
191 | } | |
192 | ||
193 | /* return the index for a given member */ | |
c227f099 | 194 | static int array_index(array_t* array, void* pointer) |
a046433a FB |
195 | { |
196 | size_t offset = (char*)pointer - array->pointer; | |
a046433a FB |
197 | assert((offset % array->item_size) == 0); |
198 | assert(offset/array->item_size < array->next); | |
199 | return offset/array->item_size; | |
200 | } | |
201 | ||
de167e41 | 202 | /* These structures are used to fake a disk and the VFAT filesystem. |
541dc0d4 | 203 | * For this reason we need to use QEMU_PACKED. */ |
de167e41 | 204 | |
c227f099 | 205 | typedef struct bootsector_t { |
de167e41 FB |
206 | uint8_t jump[3]; |
207 | uint8_t name[8]; | |
208 | uint16_t sector_size; | |
209 | uint8_t sectors_per_cluster; | |
210 | uint16_t reserved_sectors; | |
211 | uint8_t number_of_fats; | |
212 | uint16_t root_entries; | |
a046433a | 213 | uint16_t total_sectors16; |
de167e41 FB |
214 | uint8_t media_type; |
215 | uint16_t sectors_per_fat; | |
216 | uint16_t sectors_per_track; | |
217 | uint16_t number_of_heads; | |
218 | uint32_t hidden_sectors; | |
219 | uint32_t total_sectors; | |
220 | union { | |
221 | struct { | |
222 | uint8_t drive_number; | |
223 | uint8_t current_head; | |
224 | uint8_t signature; | |
225 | uint32_t id; | |
226 | uint8_t volume_label[11]; | |
541dc0d4 | 227 | } QEMU_PACKED fat16; |
de167e41 FB |
228 | struct { |
229 | uint32_t sectors_per_fat; | |
230 | uint16_t flags; | |
231 | uint8_t major,minor; | |
232 | uint32_t first_cluster_of_root_directory; | |
233 | uint16_t info_sector; | |
234 | uint16_t backup_boot_sector; | |
235 | uint16_t ignored; | |
541dc0d4 | 236 | } QEMU_PACKED fat32; |
de167e41 FB |
237 | } u; |
238 | uint8_t fat_type[8]; | |
239 | uint8_t ignored[0x1c0]; | |
240 | uint8_t magic[2]; | |
541dc0d4 | 241 | } QEMU_PACKED bootsector_t; |
de167e41 | 242 | |
b570094d TS |
243 | typedef struct { |
244 | uint8_t head; | |
245 | uint8_t sector; | |
246 | uint8_t cylinder; | |
c227f099 | 247 | } mbr_chs_t; |
b570094d | 248 | |
c227f099 | 249 | typedef struct partition_t { |
de167e41 | 250 | uint8_t attributes; /* 0x80 = bootable */ |
c227f099 | 251 | mbr_chs_t start_CHS; |
b570094d | 252 | uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */ |
c227f099 | 253 | mbr_chs_t end_CHS; |
de167e41 | 254 | uint32_t start_sector_long; |
b570094d | 255 | uint32_t length_sector_long; |
541dc0d4 | 256 | } QEMU_PACKED partition_t; |
de167e41 | 257 | |
c227f099 | 258 | typedef struct mbr_t { |
b570094d TS |
259 | uint8_t ignored[0x1b8]; |
260 | uint32_t nt_id; | |
261 | uint8_t ignored2[2]; | |
c227f099 | 262 | partition_t partition[4]; |
de167e41 | 263 | uint8_t magic[2]; |
541dc0d4 | 264 | } QEMU_PACKED mbr_t; |
de167e41 | 265 | |
c227f099 | 266 | typedef struct direntry_t { |
f671d173 | 267 | uint8_t name[8 + 3]; |
de167e41 FB |
268 | uint8_t attributes; |
269 | uint8_t reserved[2]; | |
270 | uint16_t ctime; | |
271 | uint16_t cdate; | |
272 | uint16_t adate; | |
273 | uint16_t begin_hi; | |
274 | uint16_t mtime; | |
275 | uint16_t mdate; | |
276 | uint16_t begin; | |
277 | uint32_t size; | |
541dc0d4 | 278 | } QEMU_PACKED direntry_t; |
de167e41 FB |
279 | |
280 | /* this structure are used to transparently access the files */ | |
281 | ||
c227f099 | 282 | typedef struct mapping_t { |
a046433a FB |
283 | /* begin is the first cluster, end is the last+1 */ |
284 | uint32_t begin,end; | |
de167e41 FB |
285 | /* as s->directory is growable, no pointer may be used here */ |
286 | unsigned int dir_index; | |
a046433a FB |
287 | /* the clusters of a file may be in any order; this points to the first */ |
288 | int first_mapping_index; | |
289 | union { | |
290 | /* offset is | |
291 | * - the offset in the file (in clusters) for a file, or | |
292 | * - the next cluster of the directory for a directory, and | |
293 | * - the address of the buffer for a faked entry | |
294 | */ | |
295 | struct { | |
296 | uint32_t offset; | |
297 | } file; | |
298 | struct { | |
299 | int parent_mapping_index; | |
300 | int first_dir_index; | |
301 | } dir; | |
302 | } info; | |
303 | /* path contains the full path, i.e. it always starts with s->path */ | |
304 | char* path; | |
305 | ||
306 | enum { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2, | |
307 | MODE_DIRECTORY = 4, MODE_FAKED = 8, | |
308 | MODE_DELETED = 16, MODE_RENAMED = 32 } mode; | |
309 | int read_only; | |
c227f099 | 310 | } mapping_t; |
de167e41 | 311 | |
a046433a | 312 | #ifdef DEBUG |
c227f099 AL |
313 | static void print_direntry(const struct direntry_t*); |
314 | static void print_mapping(const struct mapping_t* mapping); | |
a046433a | 315 | #endif |
de167e41 FB |
316 | |
317 | /* here begins the real VVFAT driver */ | |
318 | ||
319 | typedef struct BDRVVVFATState { | |
848c66e8 | 320 | CoMutex lock; |
a046433a | 321 | BlockDriverState* bs; /* pointer to parent */ |
de167e41 FB |
322 | unsigned int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */ |
323 | unsigned char first_sectors[0x40*0x200]; | |
3b46e624 | 324 | |
de167e41 | 325 | int fat_type; /* 16 or 32 */ |
c227f099 | 326 | array_t fat,directory,mapping; |
d5941dda | 327 | char volume_label[11]; |
3b46e624 | 328 | |
de167e41 FB |
329 | unsigned int cluster_size; |
330 | unsigned int sectors_per_cluster; | |
331 | unsigned int sectors_per_fat; | |
332 | unsigned int sectors_of_root_directory; | |
a046433a | 333 | uint32_t last_cluster_of_root_directory; |
de167e41 FB |
334 | unsigned int faked_sectors; /* how many sectors are faked before file data */ |
335 | uint32_t sector_count; /* total number of sectors of the partition */ | |
336 | uint32_t cluster_count; /* total number of clusters of this partition */ | |
de167e41 | 337 | uint32_t max_fat_value; |
3b46e624 | 338 | |
de167e41 | 339 | int current_fd; |
c227f099 | 340 | mapping_t* current_mapping; |
a046433a FB |
341 | unsigned char* cluster; /* points to current cluster */ |
342 | unsigned char* cluster_buffer; /* points to a buffer to hold temp data */ | |
de167e41 FB |
343 | unsigned int current_cluster; |
344 | ||
345 | /* write support */ | |
a046433a FB |
346 | BlockDriverState* write_target; |
347 | char* qcow_filename; | |
348 | BlockDriverState* qcow; | |
349 | void* fat2; | |
350 | char* used_clusters; | |
c227f099 | 351 | array_t commits; |
a046433a FB |
352 | const char* path; |
353 | int downcase_short_names; | |
3397f0cb KW |
354 | |
355 | Error *migration_blocker; | |
de167e41 FB |
356 | } BDRVVVFATState; |
357 | ||
b570094d TS |
358 | /* take the sector position spos and convert it to Cylinder/Head/Sector position |
359 | * if the position is outside the specified geometry, fill maximum value for CHS | |
360 | * and return 1 to signal overflow. | |
361 | */ | |
4480e0f9 MA |
362 | static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs) |
363 | { | |
b570094d | 364 | int head,sector; |
4480e0f9 MA |
365 | sector = spos % secs; spos /= secs; |
366 | head = spos % heads; spos /= heads; | |
367 | if (spos >= cyls) { | |
b570094d TS |
368 | /* Overflow, |
369 | it happens if 32bit sector positions are used, while CHS is only 24bit. | |
370 | Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */ | |
371 | chs->head = 0xFF; | |
372 | chs->sector = 0xFF; | |
373 | chs->cylinder = 0xFF; | |
374 | return 1; | |
375 | } | |
376 | chs->head = (uint8_t)head; | |
377 | chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) ); | |
378 | chs->cylinder = (uint8_t)spos; | |
379 | return 0; | |
380 | } | |
de167e41 | 381 | |
4480e0f9 | 382 | static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs) |
de167e41 FB |
383 | { |
384 | /* TODO: if the files mbr.img and bootsect.img exist, use them */ | |
c227f099 AL |
385 | mbr_t* real_mbr=(mbr_t*)s->first_sectors; |
386 | partition_t* partition = &(real_mbr->partition[0]); | |
b570094d | 387 | int lba; |
de167e41 FB |
388 | |
389 | memset(s->first_sectors,0,512); | |
3b46e624 | 390 | |
b570094d TS |
391 | /* Win NT Disk Signature */ |
392 | real_mbr->nt_id= cpu_to_le32(0xbe1afdfa); | |
393 | ||
de167e41 | 394 | partition->attributes=0x80; /* bootable */ |
b570094d TS |
395 | |
396 | /* LBA is used when partition is outside the CHS geometry */ | |
4480e0f9 MA |
397 | lba = sector2CHS(&partition->start_CHS, s->first_sectors_number - 1, |
398 | cyls, heads, secs); | |
399 | lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1, | |
400 | cyls, heads, secs); | |
b570094d TS |
401 | |
402 | /*LBA partitions are identified only by start/length_sector_long not by CHS*/ | |
f91cbefe MA |
403 | partition->start_sector_long = cpu_to_le32(s->first_sectors_number - 1); |
404 | partition->length_sector_long = cpu_to_le32(s->bs->total_sectors | |
405 | - s->first_sectors_number + 1); | |
b570094d | 406 | |
a046433a | 407 | /* FAT12/FAT16/FAT32 */ |
b570094d TS |
408 | /* DOS uses different types when partition is LBA, |
409 | probably to prevent older versions from using CHS on them */ | |
410 | partition->fs_type= s->fat_type==12 ? 0x1: | |
411 | s->fat_type==16 ? (lba?0xe:0x06): | |
412 | /*fat_tyoe==32*/ (lba?0xc:0x0b); | |
de167e41 FB |
413 | |
414 | real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; | |
415 | } | |
416 | ||
a046433a FB |
417 | /* direntry functions */ |
418 | ||
de167e41 | 419 | /* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */ |
60fe76f3 | 420 | static inline int short2long_name(char* dest,const char* src) |
de167e41 FB |
421 | { |
422 | int i; | |
1e080d5d | 423 | int len; |
de167e41 FB |
424 | for(i=0;i<129 && src[i];i++) { |
425 | dest[2*i]=src[i]; | |
426 | dest[2*i+1]=0; | |
427 | } | |
1e080d5d | 428 | len=2*i; |
de167e41 FB |
429 | dest[2*i]=dest[2*i+1]=0; |
430 | for(i=2*i+2;(i%26);i++) | |
431 | dest[i]=0xff; | |
1e080d5d | 432 | return len; |
de167e41 FB |
433 | } |
434 | ||
c227f099 | 435 | static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
de167e41 FB |
436 | { |
437 | char buffer[258]; | |
438 | int length=short2long_name(buffer,filename), | |
439 | number_of_entries=(length+25)/26,i; | |
c227f099 | 440 | direntry_t* entry; |
de167e41 FB |
441 | |
442 | for(i=0;i<number_of_entries;i++) { | |
443 | entry=array_get_next(&(s->directory)); | |
444 | entry->attributes=0xf; | |
445 | entry->reserved[0]=0; | |
446 | entry->begin=0; | |
447 | entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); | |
448 | } | |
1e080d5d | 449 | for(i=0;i<26*number_of_entries;i++) { |
de167e41 FB |
450 | int offset=(i%26); |
451 | if(offset<10) offset=1+offset; | |
452 | else if(offset<22) offset=14+offset-10; | |
453 | else offset=28+offset-22; | |
454 | entry=array_get(&(s->directory),s->directory.next-1-(i/26)); | |
455 | entry->name[offset]=buffer[i]; | |
456 | } | |
457 | return array_get(&(s->directory),s->directory.next-number_of_entries); | |
458 | } | |
459 | ||
c227f099 | 460 | static char is_free(const direntry_t* direntry) |
a046433a | 461 | { |
ad1a897e | 462 | return direntry->name[0]==0xe5 || direntry->name[0]==0x00; |
a046433a FB |
463 | } |
464 | ||
c227f099 | 465 | static char is_volume_label(const direntry_t* direntry) |
a046433a FB |
466 | { |
467 | return direntry->attributes == 0x28; | |
468 | } | |
469 | ||
c227f099 | 470 | static char is_long_name(const direntry_t* direntry) |
a046433a FB |
471 | { |
472 | return direntry->attributes == 0xf; | |
473 | } | |
474 | ||
c227f099 | 475 | static char is_short_name(const direntry_t* direntry) |
a046433a FB |
476 | { |
477 | return !is_volume_label(direntry) && !is_long_name(direntry) | |
478 | && !is_free(direntry); | |
479 | } | |
480 | ||
c227f099 | 481 | static char is_directory(const direntry_t* direntry) |
a046433a FB |
482 | { |
483 | return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; | |
484 | } | |
485 | ||
c227f099 | 486 | static inline char is_dot(const direntry_t* direntry) |
a046433a FB |
487 | { |
488 | return is_short_name(direntry) && direntry->name[0] == '.'; | |
489 | } | |
490 | ||
c227f099 | 491 | static char is_file(const direntry_t* direntry) |
a046433a FB |
492 | { |
493 | return is_short_name(direntry) && !is_directory(direntry); | |
494 | } | |
495 | ||
c227f099 | 496 | static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
a046433a FB |
497 | { |
498 | return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); | |
499 | } | |
500 | ||
c227f099 | 501 | static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
a046433a FB |
502 | { |
503 | return le32_to_cpu(direntry->size); | |
504 | } | |
505 | ||
c227f099 | 506 | static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
a046433a FB |
507 | { |
508 | direntry->begin = cpu_to_le16(begin & 0xffff); | |
509 | direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); | |
510 | } | |
511 | ||
de167e41 FB |
512 | /* fat functions */ |
513 | ||
c227f099 | 514 | static inline uint8_t fat_chksum(const direntry_t* entry) |
de167e41 FB |
515 | { |
516 | uint8_t chksum=0; | |
517 | int i; | |
518 | ||
f671d173 SW |
519 | for (i = 0; i < ARRAY_SIZE(entry->name); i++) { |
520 | chksum = (((chksum & 0xfe) >> 1) | | |
521 | ((chksum & 0x01) ? 0x80 : 0)) + entry->name[i]; | |
5606c220 | 522 | } |
3b46e624 | 523 | |
de167e41 FB |
524 | return chksum; |
525 | } | |
526 | ||
527 | /* if return_time==0, this returns the fat_date, else the fat_time */ | |
528 | static uint16_t fat_datetime(time_t time,int return_time) { | |
529 | struct tm* t; | |
de167e41 | 530 | struct tm t1; |
6ab00cee | 531 | t = &t1; |
de167e41 | 532 | localtime_r(&time,t); |
de167e41 FB |
533 | if(return_time) |
534 | return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); | |
535 | return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); | |
536 | } | |
537 | ||
538 | static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) | |
539 | { | |
a046433a FB |
540 | if(s->fat_type==32) { |
541 | uint32_t* entry=array_get(&(s->fat),cluster); | |
542 | *entry=cpu_to_le32(value); | |
de167e41 FB |
543 | } else if(s->fat_type==16) { |
544 | uint16_t* entry=array_get(&(s->fat),cluster); | |
545 | *entry=cpu_to_le16(value&0xffff); | |
546 | } else { | |
a046433a FB |
547 | int offset = (cluster*3/2); |
548 | unsigned char* p = array_get(&(s->fat), offset); | |
549 | switch (cluster&1) { | |
550 | case 0: | |
551 | p[0] = value&0xff; | |
552 | p[1] = (p[1]&0xf0) | ((value>>8)&0xf); | |
553 | break; | |
554 | case 1: | |
555 | p[0] = (p[0]&0xf) | ((value&0xf)<<4); | |
556 | p[1] = (value>>4); | |
557 | break; | |
558 | } | |
de167e41 FB |
559 | } |
560 | } | |
561 | ||
562 | static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) | |
563 | { | |
a046433a FB |
564 | if(s->fat_type==32) { |
565 | uint32_t* entry=array_get(&(s->fat),cluster); | |
566 | return le32_to_cpu(*entry); | |
de167e41 FB |
567 | } else if(s->fat_type==16) { |
568 | uint16_t* entry=array_get(&(s->fat),cluster); | |
569 | return le16_to_cpu(*entry); | |
570 | } else { | |
ffe8ab83 | 571 | const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2; |
a046433a | 572 | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
de167e41 FB |
573 | } |
574 | } | |
575 | ||
576 | static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) | |
577 | { | |
578 | if(fat_entry>s->max_fat_value-8) | |
579 | return -1; | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static inline void init_fat(BDRVVVFATState* s) | |
584 | { | |
a046433a FB |
585 | if (s->fat_type == 12) { |
586 | array_init(&(s->fat),1); | |
587 | array_ensure_allocated(&(s->fat), | |
588 | s->sectors_per_fat * 0x200 * 3 / 2 - 1); | |
589 | } else { | |
590 | array_init(&(s->fat),(s->fat_type==32?4:2)); | |
591 | array_ensure_allocated(&(s->fat), | |
592 | s->sectors_per_fat * 0x200 / s->fat.item_size - 1); | |
593 | } | |
de167e41 | 594 | memset(s->fat.pointer,0,s->fat.size); |
3b46e624 | 595 | |
de167e41 FB |
596 | switch(s->fat_type) { |
597 | case 12: s->max_fat_value=0xfff; break; | |
598 | case 16: s->max_fat_value=0xffff; break; | |
a046433a | 599 | case 32: s->max_fat_value=0x0fffffff; break; |
de167e41 FB |
600 | default: s->max_fat_value=0; /* error... */ |
601 | } | |
602 | ||
603 | } | |
604 | ||
a046433a FB |
605 | /* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */ |
606 | /* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */ | |
c227f099 | 607 | static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
a046433a | 608 | unsigned int directory_start, const char* filename, int is_dot) |
de167e41 | 609 | { |
a046433a | 610 | int i,j,long_index=s->directory.next; |
c227f099 AL |
611 | direntry_t* entry = NULL; |
612 | direntry_t* entry_long = NULL; | |
de167e41 FB |
613 | |
614 | if(is_dot) { | |
615 | entry=array_get_next(&(s->directory)); | |
f671d173 | 616 | memset(entry->name, 0x20, sizeof(entry->name)); |
de167e41 FB |
617 | memcpy(entry->name,filename,strlen(filename)); |
618 | return entry; | |
619 | } | |
3b46e624 | 620 | |
de167e41 | 621 | entry_long=create_long_filename(s,filename); |
3b46e624 | 622 | |
5fafdf24 | 623 | i = strlen(filename); |
a046433a FB |
624 | for(j = i - 1; j>0 && filename[j]!='.';j--); |
625 | if (j > 0) | |
626 | i = (j > 8 ? 8 : j); | |
627 | else if (i > 8) | |
628 | i = 8; | |
629 | ||
de167e41 | 630 | entry=array_get_next(&(s->directory)); |
f671d173 | 631 | memset(entry->name, 0x20, sizeof(entry->name)); |
51a0f568 | 632 | memcpy(entry->name, filename, i); |
3b46e624 | 633 | |
f671d173 SW |
634 | if (j > 0) { |
635 | for (i = 0; i < 3 && filename[j + 1 + i]; i++) { | |
636 | entry->name[8 + i] = filename[j + 1 + i]; | |
637 | } | |
638 | } | |
de167e41 FB |
639 | |
640 | /* upcase & remove unwanted characters */ | |
641 | for(i=10;i>=0;i--) { | |
a046433a | 642 | if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
de167e41 | 643 | if(entry->name[i]<=' ' || entry->name[i]>0x7f |
a046433a | 644 | || strchr(".*?<>|\":/\\[];,+='",entry->name[i])) |
de167e41 FB |
645 | entry->name[i]='_'; |
646 | else if(entry->name[i]>='a' && entry->name[i]<='z') | |
647 | entry->name[i]+='A'-'a'; | |
648 | } | |
649 | ||
650 | /* mangle duplicates */ | |
651 | while(1) { | |
c227f099 | 652 | direntry_t* entry1=array_get(&(s->directory),directory_start); |
de167e41 FB |
653 | int j; |
654 | ||
655 | for(;entry1<entry;entry1++) | |
a046433a | 656 | if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
de167e41 FB |
657 | break; /* found dupe */ |
658 | if(entry1==entry) /* no dupe found */ | |
659 | break; | |
660 | ||
5fafdf24 | 661 | /* use all 8 characters of name */ |
de167e41 FB |
662 | if(entry->name[7]==' ') { |
663 | int j; | |
664 | for(j=6;j>0 && entry->name[j]==' ';j--) | |
665 | entry->name[j]='~'; | |
666 | } | |
667 | ||
668 | /* increment number */ | |
669 | for(j=7;j>0 && entry->name[j]=='9';j--) | |
670 | entry->name[j]='0'; | |
671 | if(j>0) { | |
672 | if(entry->name[j]<'0' || entry->name[j]>'9') | |
673 | entry->name[j]='0'; | |
674 | else | |
675 | entry->name[j]++; | |
676 | } | |
677 | } | |
678 | ||
679 | /* calculate checksum; propagate to long name */ | |
680 | if(entry_long) { | |
681 | uint8_t chksum=fat_chksum(entry); | |
682 | ||
683 | /* calculate anew, because realloc could have taken place */ | |
684 | entry_long=array_get(&(s->directory),long_index); | |
a046433a | 685 | while(entry_long<entry && is_long_name(entry_long)) { |
de167e41 FB |
686 | entry_long->reserved[1]=chksum; |
687 | entry_long++; | |
688 | } | |
689 | } | |
690 | ||
691 | return entry; | |
692 | } | |
693 | ||
a046433a FB |
694 | /* |
695 | * Read a directory. (the index of the corresponding mapping must be passed). | |
696 | */ | |
697 | static int read_directory(BDRVVVFATState* s, int mapping_index) | |
de167e41 | 698 | { |
c227f099 AL |
699 | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
700 | direntry_t* direntry; | |
a046433a FB |
701 | const char* dirname = mapping->path; |
702 | int first_cluster = mapping->begin; | |
703 | int parent_index = mapping->info.dir.parent_mapping_index; | |
c227f099 | 704 | mapping_t* parent_mapping = (mapping_t*) |
511d2b14 | 705 | (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL); |
a046433a | 706 | int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
de167e41 FB |
707 | |
708 | DIR* dir=opendir(dirname); | |
709 | struct dirent* entry; | |
de167e41 FB |
710 | int i; |
711 | ||
a046433a FB |
712 | assert(mapping->mode & MODE_DIRECTORY); |
713 | ||
714 | if(!dir) { | |
715 | mapping->end = mapping->begin; | |
de167e41 | 716 | return -1; |
a046433a | 717 | } |
3b46e624 | 718 | |
a046433a FB |
719 | i = mapping->info.dir.first_dir_index = |
720 | first_cluster == 0 ? 0 : s->directory.next; | |
721 | ||
5fafdf24 | 722 | /* actually read the directory, and allocate the mappings */ |
de167e41 FB |
723 | while((entry=readdir(dir))) { |
724 | unsigned int length=strlen(dirname)+2+strlen(entry->d_name); | |
725 | char* buffer; | |
c227f099 | 726 | direntry_t* direntry; |
a046433a | 727 | struct stat st; |
de167e41 FB |
728 | int is_dot=!strcmp(entry->d_name,"."); |
729 | int is_dotdot=!strcmp(entry->d_name,".."); | |
730 | ||
a046433a | 731 | if(first_cluster == 0 && (is_dotdot || is_dot)) |
de167e41 | 732 | continue; |
5fafdf24 | 733 | |
d4df3dbc | 734 | buffer = g_malloc(length); |
de167e41 FB |
735 | snprintf(buffer,length,"%s/%s",dirname,entry->d_name); |
736 | ||
737 | if(stat(buffer,&st)<0) { | |
ce137829 | 738 | g_free(buffer); |
de167e41 FB |
739 | continue; |
740 | } | |
741 | ||
742 | /* create directory entry for this file */ | |
a046433a FB |
743 | direntry=create_short_and_long_name(s, i, entry->d_name, |
744 | is_dot || is_dotdot); | |
de167e41 FB |
745 | direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
746 | direntry->reserved[0]=direntry->reserved[1]=0; | |
747 | direntry->ctime=fat_datetime(st.st_ctime,1); | |
748 | direntry->cdate=fat_datetime(st.st_ctime,0); | |
749 | direntry->adate=fat_datetime(st.st_atime,0); | |
750 | direntry->begin_hi=0; | |
751 | direntry->mtime=fat_datetime(st.st_mtime,1); | |
752 | direntry->mdate=fat_datetime(st.st_mtime,0); | |
753 | if(is_dotdot) | |
a046433a | 754 | set_begin_of_direntry(direntry, first_cluster_of_parent); |
de167e41 | 755 | else if(is_dot) |
a046433a | 756 | set_begin_of_direntry(direntry, first_cluster); |
de167e41 | 757 | else |
a046433a FB |
758 | direntry->begin=0; /* do that later */ |
759 | if (st.st_size > 0x7fffffff) { | |
760 | fprintf(stderr, "File %s is larger than 2GB\n", buffer); | |
ce137829 | 761 | g_free(buffer); |
08089edc | 762 | closedir(dir); |
a046433a FB |
763 | return -2; |
764 | } | |
765 | direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size); | |
de167e41 FB |
766 | |
767 | /* create mapping for this file */ | |
a046433a | 768 | if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) { |
d4df3dbc | 769 | s->current_mapping = array_get_next(&(s->mapping)); |
de167e41 FB |
770 | s->current_mapping->begin=0; |
771 | s->current_mapping->end=st.st_size; | |
a046433a FB |
772 | /* |
773 | * we get the direntry of the most recent direntry, which | |
774 | * contains the short name and all the relevant information. | |
775 | */ | |
de167e41 | 776 | s->current_mapping->dir_index=s->directory.next-1; |
a046433a FB |
777 | s->current_mapping->first_mapping_index = -1; |
778 | if (S_ISDIR(st.st_mode)) { | |
779 | s->current_mapping->mode = MODE_DIRECTORY; | |
780 | s->current_mapping->info.dir.parent_mapping_index = | |
781 | mapping_index; | |
782 | } else { | |
783 | s->current_mapping->mode = MODE_UNDEFINED; | |
784 | s->current_mapping->info.file.offset = 0; | |
785 | } | |
786 | s->current_mapping->path=buffer; | |
787 | s->current_mapping->read_only = | |
788 | (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0; | |
b122c3b6 MA |
789 | } else { |
790 | g_free(buffer); | |
791 | } | |
de167e41 FB |
792 | } |
793 | closedir(dir); | |
794 | ||
795 | /* fill with zeroes up to the end of the cluster */ | |
796 | while(s->directory.next%(0x10*s->sectors_per_cluster)) { | |
c227f099 AL |
797 | direntry_t* direntry=array_get_next(&(s->directory)); |
798 | memset(direntry,0,sizeof(direntry_t)); | |
de167e41 FB |
799 | } |
800 | ||
a046433a FB |
801 | /* TODO: if there are more entries, bootsector has to be adjusted! */ |
802 | #define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) | |
803 | if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { | |
804 | /* root directory */ | |
805 | int cur = s->directory.next; | |
806 | array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1); | |
2b6a43a8 | 807 | s->directory.next = ROOT_ENTRIES; |
a046433a | 808 | memset(array_get(&(s->directory), cur), 0, |
c227f099 | 809 | (ROOT_ENTRIES - cur) * sizeof(direntry_t)); |
de167e41 | 810 | } |
5fafdf24 | 811 | |
a046433a | 812 | /* reget the mapping, since s->mapping was possibly realloc()ed */ |
d4df3dbc | 813 | mapping = array_get(&(s->mapping), mapping_index); |
a046433a FB |
814 | first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
815 | * 0x20 / s->cluster_size; | |
816 | mapping->end = first_cluster; | |
817 | ||
d4df3dbc | 818 | direntry = array_get(&(s->directory), mapping->dir_index); |
a046433a | 819 | set_begin_of_direntry(direntry, mapping->begin); |
3b46e624 | 820 | |
a046433a FB |
821 | return 0; |
822 | } | |
de167e41 | 823 | |
a046433a FB |
824 | static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
825 | { | |
826 | return (sector_num-s->faked_sectors)/s->sectors_per_cluster; | |
827 | } | |
de167e41 | 828 | |
a046433a FB |
829 | static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
830 | { | |
831 | return s->faked_sectors + s->sectors_per_cluster * cluster_num; | |
832 | } | |
de167e41 | 833 | |
a046433a | 834 | static int init_directories(BDRVVVFATState* s, |
d11c8917 MA |
835 | const char *dirname, int heads, int secs, |
836 | Error **errp) | |
de167e41 | 837 | { |
c227f099 AL |
838 | bootsector_t* bootsector; |
839 | mapping_t* mapping; | |
de167e41 FB |
840 | unsigned int i; |
841 | unsigned int cluster; | |
842 | ||
843 | memset(&(s->first_sectors[0]),0,0x40*0x200); | |
844 | ||
de167e41 | 845 | s->cluster_size=s->sectors_per_cluster*0x200; |
7267c094 | 846 | s->cluster_buffer=g_malloc(s->cluster_size); |
a046433a FB |
847 | |
848 | /* | |
849 | * The formula: sc = spf+1+spf*spc*(512*8/fat_type), | |
850 | * where sc is sector_count, | |
851 | * spf is sectors_per_fat, | |
852 | * spc is sectors_per_clusters, and | |
853 | * fat_type = 12, 16 or 32. | |
854 | */ | |
855 | i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; | |
856 | s->sectors_per_fat=(s->sector_count+i)/i; /* round up */ | |
3b46e624 | 857 | |
c227f099 AL |
858 | array_init(&(s->mapping),sizeof(mapping_t)); |
859 | array_init(&(s->directory),sizeof(direntry_t)); | |
de167e41 FB |
860 | |
861 | /* add volume label */ | |
862 | { | |
c227f099 | 863 | direntry_t* entry=array_get_next(&(s->directory)); |
de167e41 | 864 | entry->attributes=0x28; /* archive | volume label */ |
d5941dda | 865 | memcpy(entry->name, s->volume_label, sizeof(entry->name)); |
de167e41 FB |
866 | } |
867 | ||
de167e41 FB |
868 | /* Now build FAT, and write back information into directory */ |
869 | init_fat(s); | |
870 | ||
a046433a FB |
871 | s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2; |
872 | s->cluster_count=sector2cluster(s, s->sector_count); | |
873 | ||
874 | mapping = array_get_next(&(s->mapping)); | |
875 | mapping->begin = 0; | |
876 | mapping->dir_index = 0; | |
877 | mapping->info.dir.parent_mapping_index = -1; | |
878 | mapping->first_mapping_index = -1; | |
7267c094 | 879 | mapping->path = g_strdup(dirname); |
a046433a FB |
880 | i = strlen(mapping->path); |
881 | if (i > 0 && mapping->path[i - 1] == '/') | |
882 | mapping->path[i - 1] = '\0'; | |
883 | mapping->mode = MODE_DIRECTORY; | |
884 | mapping->read_only = 0; | |
885 | s->path = mapping->path; | |
886 | ||
887 | for (i = 0, cluster = 0; i < s->mapping.next; i++) { | |
5fafdf24 | 888 | /* MS-DOS expects the FAT to be 0 for the root directory |
a046433a FB |
889 | * (except for the media byte). */ |
890 | /* LATER TODO: still true for FAT32? */ | |
891 | int fix_fat = (i != 0); | |
892 | mapping = array_get(&(s->mapping), i); | |
893 | ||
894 | if (mapping->mode & MODE_DIRECTORY) { | |
895 | mapping->begin = cluster; | |
896 | if(read_directory(s, i)) { | |
d11c8917 MA |
897 | error_setg(errp, "Could not read directory %s", |
898 | mapping->path); | |
de167e41 FB |
899 | return -1; |
900 | } | |
a046433a FB |
901 | mapping = array_get(&(s->mapping), i); |
902 | } else { | |
903 | assert(mapping->mode == MODE_UNDEFINED); | |
de167e41 | 904 | mapping->mode=MODE_NORMAL; |
a046433a FB |
905 | mapping->begin = cluster; |
906 | if (mapping->end > 0) { | |
c227f099 | 907 | direntry_t* direntry = array_get(&(s->directory), |
a046433a FB |
908 | mapping->dir_index); |
909 | ||
910 | mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; | |
911 | set_begin_of_direntry(direntry, mapping->begin); | |
912 | } else { | |
913 | mapping->end = cluster + 1; | |
914 | fix_fat = 0; | |
de167e41 | 915 | } |
a046433a FB |
916 | } |
917 | ||
918 | assert(mapping->begin < mapping->end); | |
919 | ||
8ce0f869 AZ |
920 | /* next free cluster */ |
921 | cluster = mapping->end; | |
922 | ||
923 | if(cluster > s->cluster_count) { | |
d11c8917 MA |
924 | error_setg(errp, |
925 | "Directory does not fit in FAT%d (capacity %.2f MB)", | |
926 | s->fat_type, s->sector_count / 2000.0); | |
927 | return -1; | |
8ce0f869 AZ |
928 | } |
929 | ||
a046433a FB |
930 | /* fix fat for entry */ |
931 | if (fix_fat) { | |
8ce0f869 | 932 | int j; |
a046433a FB |
933 | for(j = mapping->begin; j < mapping->end - 1; j++) |
934 | fat_set(s, j, j+1); | |
935 | fat_set(s, mapping->end - 1, s->max_fat_value); | |
936 | } | |
de167e41 FB |
937 | } |
938 | ||
a046433a FB |
939 | mapping = array_get(&(s->mapping), 0); |
940 | s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; | |
941 | s->last_cluster_of_root_directory = mapping->end; | |
942 | ||
943 | /* the FAT signature */ | |
944 | fat_set(s,0,s->max_fat_value); | |
945 | fat_set(s,1,s->max_fat_value); | |
de167e41 | 946 | |
a046433a FB |
947 | s->current_mapping = NULL; |
948 | ||
c227f099 | 949 | bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
de167e41 FB |
950 | bootsector->jump[0]=0xeb; |
951 | bootsector->jump[1]=0x3e; | |
952 | bootsector->jump[2]=0x90; | |
953 | memcpy(bootsector->name,"QEMU ",8); | |
954 | bootsector->sector_size=cpu_to_le16(0x200); | |
955 | bootsector->sectors_per_cluster=s->sectors_per_cluster; | |
956 | bootsector->reserved_sectors=cpu_to_le16(1); | |
957 | bootsector->number_of_fats=0x2; /* number of FATs */ | |
958 | bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10); | |
a046433a | 959 | bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
aad37c06 | 960 | bootsector->media_type=(s->first_sectors_number>1?0xf8:0xf0); /* media descriptor (f8=hd, f0=3.5 fd)*/ |
a046433a | 961 | s->fat.pointer[0] = bootsector->media_type; |
de167e41 | 962 | bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
4480e0f9 MA |
963 | bootsector->sectors_per_track = cpu_to_le16(secs); |
964 | bootsector->number_of_heads = cpu_to_le16(heads); | |
de167e41 | 965 | bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
a046433a | 966 | bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
de167e41 | 967 | |
a046433a | 968 | /* LATER TODO: if FAT32, this is wrong */ |
aad37c06 | 969 | bootsector->u.fat16.drive_number=s->first_sectors_number==1?0:0x80; /* fda=0, hda=0x80 */ |
de167e41 FB |
970 | bootsector->u.fat16.current_head=0; |
971 | bootsector->u.fat16.signature=0x29; | |
972 | bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd); | |
973 | ||
d5941dda WB |
974 | memcpy(bootsector->u.fat16.volume_label, s->volume_label, |
975 | sizeof(bootsector->u.fat16.volume_label)); | |
de167e41 FB |
976 | memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
977 | bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
83f64091 | 982 | #ifdef DEBUG |
a046433a | 983 | static BDRVVVFATState *vvv = NULL; |
83f64091 | 984 | #endif |
a046433a | 985 | |
68c70af1 | 986 | static int enable_write_target(BDRVVVFATState *s, Error **errp); |
a046433a FB |
987 | static int is_consistent(BDRVVVFATState *s); |
988 | ||
7ad9be64 KW |
989 | static QemuOptsList runtime_opts = { |
990 | .name = "vvfat", | |
991 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
992 | .desc = { | |
993 | { | |
994 | .name = "dir", | |
995 | .type = QEMU_OPT_STRING, | |
996 | .help = "Host directory to map to the vvfat device", | |
997 | }, | |
998 | { | |
999 | .name = "fat-type", | |
1000 | .type = QEMU_OPT_NUMBER, | |
1001 | .help = "FAT type (12, 16 or 32)", | |
1002 | }, | |
1003 | { | |
1004 | .name = "floppy", | |
1005 | .type = QEMU_OPT_BOOL, | |
1006 | .help = "Create a floppy rather than a hard disk image", | |
1007 | }, | |
d5941dda WB |
1008 | { |
1009 | .name = "label", | |
1010 | .type = QEMU_OPT_STRING, | |
1011 | .help = "Use a volume label other than QEMU VVFAT", | |
1012 | }, | |
7ad9be64 KW |
1013 | { |
1014 | .name = "rw", | |
1015 | .type = QEMU_OPT_BOOL, | |
1016 | .help = "Make the image writable", | |
1017 | }, | |
1018 | { /* end of list */ } | |
1019 | }, | |
1020 | }; | |
1021 | ||
1022 | static void vvfat_parse_filename(const char *filename, QDict *options, | |
1023 | Error **errp) | |
1024 | { | |
1025 | int fat_type = 0; | |
1026 | bool floppy = false; | |
1027 | bool rw = false; | |
1028 | int i; | |
1029 | ||
1030 | if (!strstart(filename, "fat:", NULL)) { | |
1031 | error_setg(errp, "File name string must start with 'fat:'"); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | /* Parse options */ | |
1036 | if (strstr(filename, ":32:")) { | |
1037 | fat_type = 32; | |
1038 | } else if (strstr(filename, ":16:")) { | |
1039 | fat_type = 16; | |
1040 | } else if (strstr(filename, ":12:")) { | |
1041 | fat_type = 12; | |
1042 | } | |
1043 | ||
1044 | if (strstr(filename, ":floppy:")) { | |
1045 | floppy = true; | |
1046 | } | |
1047 | ||
1048 | if (strstr(filename, ":rw:")) { | |
1049 | rw = true; | |
1050 | } | |
1051 | ||
1052 | /* Get the directory name without options */ | |
1053 | i = strrchr(filename, ':') - filename; | |
1054 | assert(i >= 3); | |
1055 | if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) { | |
1056 | /* workaround for DOS drive names */ | |
1057 | filename += i - 1; | |
1058 | } else { | |
1059 | filename += i + 1; | |
1060 | } | |
1061 | ||
1062 | /* Fill in the options QDict */ | |
1063 | qdict_put(options, "dir", qstring_from_str(filename)); | |
1064 | qdict_put(options, "fat-type", qint_from_int(fat_type)); | |
fc48ffc3 EB |
1065 | qdict_put(options, "floppy", qbool_from_bool(floppy)); |
1066 | qdict_put(options, "rw", qbool_from_bool(rw)); | |
7ad9be64 KW |
1067 | } |
1068 | ||
015a1036 HR |
1069 | static int vvfat_open(BlockDriverState *bs, QDict *options, int flags, |
1070 | Error **errp) | |
de167e41 FB |
1071 | { |
1072 | BDRVVVFATState *s = bs->opaque; | |
7ad9be64 KW |
1073 | int cyls, heads, secs; |
1074 | bool floppy; | |
d5941dda | 1075 | const char *dirname, *label; |
7ad9be64 KW |
1076 | QemuOpts *opts; |
1077 | Error *local_err = NULL; | |
1078 | int ret; | |
de167e41 | 1079 | |
83f64091 | 1080 | #ifdef DEBUG |
a046433a | 1081 | vvv = s; |
83f64091 | 1082 | #endif |
a046433a | 1083 | |
87ea75d5 | 1084 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
7ad9be64 | 1085 | qemu_opts_absorb_qdict(opts, options, &local_err); |
84d18f06 | 1086 | if (local_err) { |
c0f92b52 | 1087 | error_propagate(errp, local_err); |
7ad9be64 KW |
1088 | ret = -EINVAL; |
1089 | goto fail; | |
1090 | } | |
1091 | ||
1092 | dirname = qemu_opt_get(opts, "dir"); | |
1093 | if (!dirname) { | |
c0f92b52 | 1094 | error_setg(errp, "vvfat block driver requires a 'dir' option"); |
7ad9be64 KW |
1095 | ret = -EINVAL; |
1096 | goto fail; | |
1097 | } | |
1098 | ||
1099 | s->fat_type = qemu_opt_get_number(opts, "fat-type", 0); | |
1100 | floppy = qemu_opt_get_bool(opts, "floppy", false); | |
1101 | ||
d5941dda WB |
1102 | memset(s->volume_label, ' ', sizeof(s->volume_label)); |
1103 | label = qemu_opt_get(opts, "label"); | |
1104 | if (label) { | |
1105 | size_t label_length = strlen(label); | |
1106 | if (label_length > 11) { | |
1107 | error_setg(errp, "vvfat label cannot be longer than 11 bytes"); | |
1108 | ret = -EINVAL; | |
1109 | goto fail; | |
1110 | } | |
1111 | memcpy(s->volume_label, label, label_length); | |
d208c50d KW |
1112 | } else { |
1113 | memcpy(s->volume_label, "QEMU VVFAT", 10); | |
d5941dda WB |
1114 | } |
1115 | ||
7ad9be64 KW |
1116 | if (floppy) { |
1117 | /* 1.44MB or 2.88MB floppy. 2.88MB can be FAT12 (default) or FAT16. */ | |
1118 | if (!s->fat_type) { | |
1119 | s->fat_type = 12; | |
1120 | secs = 36; | |
1121 | s->sectors_per_cluster = 2; | |
1122 | } else { | |
1123 | secs = s->fat_type == 12 ? 18 : 36; | |
1124 | s->sectors_per_cluster = 1; | |
1125 | } | |
1126 | s->first_sectors_number = 1; | |
1127 | cyls = 80; | |
1128 | heads = 2; | |
1129 | } else { | |
1130 | /* 32MB or 504MB disk*/ | |
1131 | if (!s->fat_type) { | |
1132 | s->fat_type = 16; | |
1133 | } | |
4c709660 | 1134 | s->first_sectors_number = 0x40; |
7ad9be64 KW |
1135 | cyls = s->fat_type == 12 ? 64 : 1024; |
1136 | heads = 16; | |
1137 | secs = 63; | |
1138 | } | |
1139 | ||
1140 | switch (s->fat_type) { | |
1141 | case 32: | |
1142 | fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. " | |
1143 | "You are welcome to do so!\n"); | |
1144 | break; | |
1145 | case 16: | |
1146 | case 12: | |
1147 | break; | |
1148 | default: | |
c0f92b52 | 1149 | error_setg(errp, "Valid FAT types are only 12, 16 and 32"); |
7ad9be64 KW |
1150 | ret = -EINVAL; |
1151 | goto fail; | |
1152 | } | |
1153 | ||
1154 | ||
a046433a FB |
1155 | s->bs = bs; |
1156 | ||
a046433a | 1157 | /* LATER TODO: if FAT32, adjust */ |
a046433a | 1158 | s->sectors_per_cluster=0x10; |
de167e41 FB |
1159 | |
1160 | s->current_cluster=0xffffffff; | |
de167e41 | 1161 | |
a046433a FB |
1162 | /* read only is the default for safety */ |
1163 | bs->read_only = 1; | |
1164 | s->qcow = s->write_target = NULL; | |
1165 | s->qcow_filename = NULL; | |
1166 | s->fat2 = NULL; | |
1167 | s->downcase_short_names = 1; | |
3b46e624 | 1168 | |
4480e0f9 MA |
1169 | fprintf(stderr, "vvfat %s chs %d,%d,%d\n", |
1170 | dirname, cyls, heads, secs); | |
a046433a | 1171 | |
4480e0f9 | 1172 | s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1); |
5a742b55 | 1173 | |
7ad9be64 | 1174 | if (qemu_opt_get_bool(opts, "rw", false)) { |
68c70af1 | 1175 | ret = enable_write_target(s, errp); |
78f27bd0 | 1176 | if (ret < 0) { |
7ad9be64 KW |
1177 | goto fail; |
1178 | } | |
1179 | bs->read_only = 0; | |
b570094d TS |
1180 | } |
1181 | ||
4575eb49 | 1182 | bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */ |
4480e0f9 | 1183 | bs->total_sectors = cyls * heads * secs; |
b570094d | 1184 | |
d11c8917 | 1185 | if (init_directories(s, dirname, heads, secs, errp)) { |
7ad9be64 KW |
1186 | ret = -EIO; |
1187 | goto fail; | |
4480e0f9 | 1188 | } |
de167e41 | 1189 | |
b570094d TS |
1190 | s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; |
1191 | ||
4480e0f9 MA |
1192 | if (s->first_sectors_number == 0x40) { |
1193 | init_mbr(s, cyls, heads, secs); | |
273e4e03 | 1194 | } |
a046433a FB |
1195 | |
1196 | // assert(is_consistent(s)); | |
848c66e8 | 1197 | qemu_co_mutex_init(&s->lock); |
3397f0cb KW |
1198 | |
1199 | /* Disable migration when vvfat is used rw */ | |
1200 | if (s->qcow) { | |
81e5f78a AG |
1201 | error_setg(&s->migration_blocker, |
1202 | "The vvfat (rw) format used by node '%s' " | |
1203 | "does not support live migration", | |
1204 | bdrv_get_device_or_node_name(bs)); | |
3397f0cb KW |
1205 | migrate_add_blocker(s->migration_blocker); |
1206 | } | |
1207 | ||
7ad9be64 KW |
1208 | ret = 0; |
1209 | fail: | |
1210 | qemu_opts_del(opts); | |
1211 | return ret; | |
de167e41 FB |
1212 | } |
1213 | ||
1214 | static inline void vvfat_close_current_file(BDRVVVFATState *s) | |
1215 | { | |
1216 | if(s->current_mapping) { | |
a046433a FB |
1217 | s->current_mapping = NULL; |
1218 | if (s->current_fd) { | |
2e1e79da | 1219 | qemu_close(s->current_fd); |
a046433a FB |
1220 | s->current_fd = 0; |
1221 | } | |
de167e41 | 1222 | } |
a046433a | 1223 | s->current_cluster = -1; |
de167e41 FB |
1224 | } |
1225 | ||
1226 | /* mappings between index1 and index2-1 are supposed to be ordered | |
1227 | * return value is the index of the last mapping for which end>cluster_num | |
1228 | */ | |
1229 | static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) | |
1230 | { | |
de167e41 | 1231 | while(1) { |
88bf7950 | 1232 | int index3; |
c227f099 | 1233 | mapping_t* mapping; |
de167e41 FB |
1234 | index3=(index1+index2)/2; |
1235 | mapping=array_get(&(s->mapping),index3); | |
a046433a FB |
1236 | assert(mapping->begin < mapping->end); |
1237 | if(mapping->begin>=cluster_num) { | |
de167e41 FB |
1238 | assert(index2!=index3 || index2==0); |
1239 | if(index2==index3) | |
a046433a | 1240 | return index1; |
de167e41 FB |
1241 | index2=index3; |
1242 | } else { | |
1243 | if(index1==index3) | |
a046433a | 1244 | return mapping->end<=cluster_num ? index2 : index1; |
de167e41 FB |
1245 | index1=index3; |
1246 | } | |
1247 | assert(index1<=index2); | |
a046433a FB |
1248 | DLOG(mapping=array_get(&(s->mapping),index1); |
1249 | assert(mapping->begin<=cluster_num); | |
5fafdf24 | 1250 | assert(index2 >= s->mapping.next || |
a046433a FB |
1251 | ((mapping = array_get(&(s->mapping),index2)) && |
1252 | mapping->end>cluster_num))); | |
de167e41 FB |
1253 | } |
1254 | } | |
1255 | ||
c227f099 | 1256 | static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
de167e41 FB |
1257 | { |
1258 | int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); | |
c227f099 | 1259 | mapping_t* mapping; |
de167e41 | 1260 | if(index>=s->mapping.next) |
511d2b14 | 1261 | return NULL; |
de167e41 FB |
1262 | mapping=array_get(&(s->mapping),index); |
1263 | if(mapping->begin>cluster_num) | |
511d2b14 | 1264 | return NULL; |
a046433a | 1265 | assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
de167e41 FB |
1266 | return mapping; |
1267 | } | |
1268 | ||
c227f099 | 1269 | static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
de167e41 FB |
1270 | { |
1271 | if(!mapping) | |
1272 | return -1; | |
de167e41 | 1273 | if(!s->current_mapping || |
a046433a | 1274 | strcmp(s->current_mapping->path,mapping->path)) { |
de167e41 | 1275 | /* open file */ |
6165f4d8 | 1276 | int fd = qemu_open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE); |
de167e41 FB |
1277 | if(fd<0) |
1278 | return -1; | |
1279 | vvfat_close_current_file(s); | |
1280 | s->current_fd = fd; | |
de167e41 FB |
1281 | s->current_mapping = mapping; |
1282 | } | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static inline int read_cluster(BDRVVVFATState *s,int cluster_num) | |
1287 | { | |
1288 | if(s->current_cluster != cluster_num) { | |
1289 | int result=0; | |
1290 | off_t offset; | |
a046433a | 1291 | assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
de167e41 FB |
1292 | if(!s->current_mapping |
1293 | || s->current_mapping->begin>cluster_num | |
1294 | || s->current_mapping->end<=cluster_num) { | |
1295 | /* binary search of mappings for file */ | |
c227f099 | 1296 | mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
a046433a FB |
1297 | |
1298 | assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); | |
1299 | ||
1300 | if (mapping && mapping->mode & MODE_DIRECTORY) { | |
1301 | vvfat_close_current_file(s); | |
1302 | s->current_mapping = mapping; | |
1303 | read_cluster_directory: | |
1304 | offset = s->cluster_size*(cluster_num-s->current_mapping->begin); | |
ffe8ab83 | 1305 | s->cluster = (unsigned char*)s->directory.pointer+offset |
a046433a FB |
1306 | + 0x20*s->current_mapping->info.dir.first_dir_index; |
1307 | assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); | |
1308 | assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size); | |
1309 | s->current_cluster = cluster_num; | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | if(open_file(s,mapping)) | |
de167e41 | 1314 | return -2; |
a046433a FB |
1315 | } else if (s->current_mapping->mode & MODE_DIRECTORY) |
1316 | goto read_cluster_directory; | |
de167e41 | 1317 | |
a046433a FB |
1318 | assert(s->current_fd); |
1319 | ||
1320 | offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; | |
de167e41 FB |
1321 | if(lseek(s->current_fd, offset, SEEK_SET)!=offset) |
1322 | return -3; | |
a046433a | 1323 | s->cluster=s->cluster_buffer; |
de167e41 FB |
1324 | result=read(s->current_fd,s->cluster,s->cluster_size); |
1325 | if(result<0) { | |
1326 | s->current_cluster = -1; | |
1327 | return -1; | |
1328 | } | |
1329 | s->current_cluster = cluster_num; | |
1330 | } | |
1331 | return 0; | |
1332 | } | |
1333 | ||
a046433a | 1334 | #ifdef DEBUG |
c227f099 | 1335 | static void print_direntry(const direntry_t* direntry) |
de167e41 | 1336 | { |
a046433a FB |
1337 | int j = 0; |
1338 | char buffer[1024]; | |
1339 | ||
3e89cb04 | 1340 | fprintf(stderr, "direntry %p: ", direntry); |
de167e41 FB |
1341 | if(!direntry) |
1342 | return; | |
a046433a | 1343 | if(is_long_name(direntry)) { |
de167e41 FB |
1344 | unsigned char* c=(unsigned char*)direntry; |
1345 | int i; | |
1346 | for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) | |
3891b370 | 1347 | #define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;} |
a046433a | 1348 | ADD_CHAR(c[i]); |
de167e41 | 1349 | for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
a046433a | 1350 | ADD_CHAR(c[i]); |
de167e41 | 1351 | for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
a046433a FB |
1352 | ADD_CHAR(c[i]); |
1353 | buffer[j] = 0; | |
1354 | fprintf(stderr, "%s\n", buffer); | |
de167e41 FB |
1355 | } else { |
1356 | int i; | |
1357 | for(i=0;i<11;i++) | |
a046433a FB |
1358 | ADD_CHAR(direntry->name[i]); |
1359 | buffer[j] = 0; | |
1360 | fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n", | |
1361 | buffer, | |
de167e41 | 1362 | direntry->attributes, |
a046433a | 1363 | begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
de167e41 FB |
1364 | } |
1365 | } | |
1366 | ||
c227f099 | 1367 | static void print_mapping(const mapping_t* mapping) |
de167e41 | 1368 | { |
3e89cb04 KW |
1369 | fprintf(stderr, "mapping (%p): begin, end = %d, %d, dir_index = %d, " |
1370 | "first_mapping_index = %d, name = %s, mode = 0x%x, " , | |
1371 | mapping, mapping->begin, mapping->end, mapping->dir_index, | |
1372 | mapping->first_mapping_index, mapping->path, mapping->mode); | |
1373 | ||
a046433a FB |
1374 | if (mapping->mode & MODE_DIRECTORY) |
1375 | fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index); | |
1376 | else | |
1377 | fprintf(stderr, "offset = %d\n", mapping->info.file.offset); | |
de167e41 | 1378 | } |
a046433a | 1379 | #endif |
de167e41 | 1380 | |
5fafdf24 | 1381 | static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
a046433a | 1382 | uint8_t *buf, int nb_sectors) |
de167e41 | 1383 | { |
a046433a | 1384 | BDRVVVFATState *s = bs->opaque; |
de167e41 | 1385 | int i; |
de167e41 | 1386 | |
a046433a | 1387 | for(i=0;i<nb_sectors;i++,sector_num++) { |
e654bfe4 | 1388 | if (sector_num >= bs->total_sectors) |
a046433a FB |
1389 | return -1; |
1390 | if (s->qcow) { | |
1391 | int n; | |
7704df98 | 1392 | if (bdrv_is_allocated(s->qcow, sector_num, nb_sectors-i, &n)) { |
a046433a | 1393 | DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
7704df98 KW |
1394 | if (bdrv_read(s->qcow, sector_num, buf + i*0x200, n)) { |
1395 | return -1; | |
1396 | } | |
1397 | i += n - 1; | |
1398 | sector_num += n - 1; | |
1399 | continue; | |
1400 | } | |
a046433a | 1401 | DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
de167e41 | 1402 | } |
a046433a FB |
1403 | if(sector_num<s->faked_sectors) { |
1404 | if(sector_num<s->first_sectors_number) | |
1405 | memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); | |
1406 | else if(sector_num-s->first_sectors_number<s->sectors_per_fat) | |
1407 | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); | |
1408 | else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) | |
1409 | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); | |
1410 | } else { | |
1411 | uint32_t sector=sector_num-s->faked_sectors, | |
1412 | sector_offset_in_cluster=(sector%s->sectors_per_cluster), | |
1413 | cluster_num=sector/s->sectors_per_cluster; | |
e654bfe4 | 1414 | if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) { |
a046433a FB |
1415 | /* LATER TODO: strict: return -1; */ |
1416 | memset(buf+i*0x200,0,0x200); | |
1417 | continue; | |
de167e41 | 1418 | } |
a046433a | 1419 | memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
de167e41 FB |
1420 | } |
1421 | } | |
de167e41 FB |
1422 | return 0; |
1423 | } | |
1424 | ||
4575eb49 KW |
1425 | static int coroutine_fn |
1426 | vvfat_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
1427 | QEMUIOVector *qiov, int flags) | |
2914caa0 PB |
1428 | { |
1429 | int ret; | |
1430 | BDRVVVFATState *s = bs->opaque; | |
4575eb49 KW |
1431 | uint64_t sector_num = offset >> BDRV_SECTOR_BITS; |
1432 | int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
1433 | void *buf; | |
1434 | ||
1435 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); | |
1436 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
1437 | ||
1438 | buf = g_try_malloc(bytes); | |
1439 | if (bytes && buf == NULL) { | |
1440 | return -ENOMEM; | |
1441 | } | |
1442 | ||
2914caa0 PB |
1443 | qemu_co_mutex_lock(&s->lock); |
1444 | ret = vvfat_read(bs, sector_num, buf, nb_sectors); | |
1445 | qemu_co_mutex_unlock(&s->lock); | |
4575eb49 KW |
1446 | |
1447 | qemu_iovec_from_buf(qiov, 0, buf, bytes); | |
1448 | g_free(buf); | |
1449 | ||
2914caa0 PB |
1450 | return ret; |
1451 | } | |
1452 | ||
a046433a | 1453 | /* LATER TODO: statify all functions */ |
de167e41 | 1454 | |
a046433a FB |
1455 | /* |
1456 | * Idea of the write support (use snapshot): | |
de167e41 | 1457 | * |
a046433a FB |
1458 | * 1. check if all data is consistent, recording renames, modifications, |
1459 | * new files and directories (in s->commits). | |
de167e41 | 1460 | * |
a046433a | 1461 | * 2. if the data is not consistent, stop committing |
de167e41 | 1462 | * |
a046433a FB |
1463 | * 3. handle renames, and create new files and directories (do not yet |
1464 | * write their contents) | |
de167e41 | 1465 | * |
a046433a FB |
1466 | * 4. walk the directories, fixing the mapping and direntries, and marking |
1467 | * the handled mappings as not deleted | |
de167e41 | 1468 | * |
a046433a | 1469 | * 5. commit the contents of the files |
de167e41 | 1470 | * |
a046433a | 1471 | * 6. handle deleted files and directories |
de167e41 FB |
1472 | * |
1473 | */ | |
1474 | ||
c227f099 | 1475 | typedef struct commit_t { |
a046433a FB |
1476 | char* path; |
1477 | union { | |
1478 | struct { uint32_t cluster; } rename; | |
1479 | struct { int dir_index; uint32_t modified_offset; } writeout; | |
1480 | struct { uint32_t first_cluster; } new_file; | |
1481 | struct { uint32_t cluster; } mkdir; | |
1482 | } param; | |
1483 | /* DELETEs and RMDIRs are handled differently: see handle_deletes() */ | |
1484 | enum { | |
1485 | ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR | |
1486 | } action; | |
c227f099 | 1487 | } commit_t; |
de167e41 | 1488 | |
a046433a | 1489 | static void clear_commits(BDRVVVFATState* s) |
de167e41 FB |
1490 | { |
1491 | int i; | |
a046433a FB |
1492 | DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next)); |
1493 | for (i = 0; i < s->commits.next; i++) { | |
c227f099 | 1494 | commit_t* commit = array_get(&(s->commits), i); |
a046433a FB |
1495 | assert(commit->path || commit->action == ACTION_WRITEOUT); |
1496 | if (commit->action != ACTION_WRITEOUT) { | |
1497 | assert(commit->path); | |
ce137829 | 1498 | g_free(commit->path); |
a046433a FB |
1499 | } else |
1500 | assert(commit->path == NULL); | |
de167e41 | 1501 | } |
a046433a | 1502 | s->commits.next = 0; |
de167e41 FB |
1503 | } |
1504 | ||
a046433a FB |
1505 | static void schedule_rename(BDRVVVFATState* s, |
1506 | uint32_t cluster, char* new_path) | |
de167e41 | 1507 | { |
c227f099 | 1508 | commit_t* commit = array_get_next(&(s->commits)); |
a046433a FB |
1509 | commit->path = new_path; |
1510 | commit->param.rename.cluster = cluster; | |
1511 | commit->action = ACTION_RENAME; | |
de167e41 FB |
1512 | } |
1513 | ||
a046433a FB |
1514 | static void schedule_writeout(BDRVVVFATState* s, |
1515 | int dir_index, uint32_t modified_offset) | |
de167e41 | 1516 | { |
c227f099 | 1517 | commit_t* commit = array_get_next(&(s->commits)); |
a046433a FB |
1518 | commit->path = NULL; |
1519 | commit->param.writeout.dir_index = dir_index; | |
1520 | commit->param.writeout.modified_offset = modified_offset; | |
1521 | commit->action = ACTION_WRITEOUT; | |
de167e41 FB |
1522 | } |
1523 | ||
a046433a FB |
1524 | static void schedule_new_file(BDRVVVFATState* s, |
1525 | char* path, uint32_t first_cluster) | |
de167e41 | 1526 | { |
c227f099 | 1527 | commit_t* commit = array_get_next(&(s->commits)); |
a046433a FB |
1528 | commit->path = path; |
1529 | commit->param.new_file.first_cluster = first_cluster; | |
1530 | commit->action = ACTION_NEW_FILE; | |
1531 | } | |
1532 | ||
1533 | static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) | |
1534 | { | |
c227f099 | 1535 | commit_t* commit = array_get_next(&(s->commits)); |
a046433a FB |
1536 | commit->path = path; |
1537 | commit->param.mkdir.cluster = cluster; | |
1538 | commit->action = ACTION_MKDIR; | |
1539 | } | |
1540 | ||
1541 | typedef struct { | |
64eaabda TS |
1542 | /* |
1543 | * Since the sequence number is at most 0x3f, and the filename | |
1544 | * length is at most 13 times the sequence number, the maximal | |
1545 | * filename length is 0x3f * 13 bytes. | |
1546 | */ | |
1547 | unsigned char name[0x3f * 13 + 1]; | |
a046433a FB |
1548 | int checksum, len; |
1549 | int sequence_number; | |
1550 | } long_file_name; | |
1551 | ||
1552 | static void lfn_init(long_file_name* lfn) | |
1553 | { | |
1554 | lfn->sequence_number = lfn->len = 0; | |
1555 | lfn->checksum = 0x100; | |
1556 | } | |
1557 | ||
1558 | /* return 0 if parsed successfully, > 0 if no long name, < 0 if error */ | |
1559 | static int parse_long_name(long_file_name* lfn, | |
c227f099 | 1560 | const direntry_t* direntry) |
a046433a FB |
1561 | { |
1562 | int i, j, offset; | |
1563 | const unsigned char* pointer = (const unsigned char*)direntry; | |
1564 | ||
1565 | if (!is_long_name(direntry)) | |
1566 | return 1; | |
1567 | ||
1568 | if (pointer[0] & 0x40) { | |
1569 | lfn->sequence_number = pointer[0] & 0x3f; | |
1570 | lfn->checksum = pointer[13]; | |
1571 | lfn->name[0] = 0; | |
59fdb018 | 1572 | lfn->name[lfn->sequence_number * 13] = 0; |
a046433a FB |
1573 | } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
1574 | return -1; | |
1575 | else if (pointer[13] != lfn->checksum) | |
1576 | return -2; | |
1577 | else if (pointer[12] || pointer[26] || pointer[27]) | |
1578 | return -3; | |
1579 | ||
1580 | offset = 13 * (lfn->sequence_number - 1); | |
1581 | for (i = 0, j = 1; i < 13; i++, j+=2) { | |
1582 | if (j == 11) | |
1583 | j = 14; | |
1584 | else if (j == 26) | |
1585 | j = 28; | |
1586 | ||
1587 | if (pointer[j+1] == 0) | |
1588 | lfn->name[offset + i] = pointer[j]; | |
1589 | else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) | |
1590 | return -4; | |
1591 | else | |
1592 | lfn->name[offset + i] = 0; | |
de167e41 | 1593 | } |
a046433a FB |
1594 | |
1595 | if (pointer[0] & 0x40) | |
ffe8ab83 | 1596 | lfn->len = offset + strlen((char*)lfn->name + offset); |
a046433a | 1597 | |
de167e41 FB |
1598 | return 0; |
1599 | } | |
1600 | ||
a046433a FB |
1601 | /* returns 0 if successful, >0 if no short_name, and <0 on error */ |
1602 | static int parse_short_name(BDRVVVFATState* s, | |
c227f099 | 1603 | long_file_name* lfn, direntry_t* direntry) |
de167e41 | 1604 | { |
a046433a | 1605 | int i, j; |
de167e41 | 1606 | |
a046433a FB |
1607 | if (!is_short_name(direntry)) |
1608 | return 1; | |
1609 | ||
1610 | for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); | |
1611 | for (i = 0; i <= j; i++) { | |
1612 | if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) | |
1613 | return -1; | |
1614 | else if (s->downcase_short_names) | |
47398b9c | 1615 | lfn->name[i] = qemu_tolower(direntry->name[i]); |
a046433a FB |
1616 | else |
1617 | lfn->name[i] = direntry->name[i]; | |
de167e41 FB |
1618 | } |
1619 | ||
f671d173 SW |
1620 | for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) { |
1621 | } | |
a046433a FB |
1622 | if (j >= 0) { |
1623 | lfn->name[i++] = '.'; | |
1624 | lfn->name[i + j + 1] = '\0'; | |
1625 | for (;j >= 0; j--) { | |
f671d173 SW |
1626 | uint8_t c = direntry->name[8 + j]; |
1627 | if (c <= ' ' || c > 0x7f) { | |
1628 | return -2; | |
1629 | } else if (s->downcase_short_names) { | |
1630 | lfn->name[i + j] = qemu_tolower(c); | |
1631 | } else { | |
1632 | lfn->name[i + j] = c; | |
1633 | } | |
a046433a FB |
1634 | } |
1635 | } else | |
1636 | lfn->name[i + j + 1] = '\0'; | |
1637 | ||
ffe8ab83 | 1638 | lfn->len = strlen((char*)lfn->name); |
a046433a FB |
1639 | |
1640 | return 0; | |
de167e41 FB |
1641 | } |
1642 | ||
a046433a FB |
1643 | static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
1644 | unsigned int cluster) | |
de167e41 | 1645 | { |
a046433a FB |
1646 | if (cluster < s->last_cluster_of_root_directory) { |
1647 | if (cluster + 1 == s->last_cluster_of_root_directory) | |
1648 | return s->max_fat_value; | |
1649 | else | |
1650 | return cluster + 1; | |
1651 | } | |
1652 | ||
1653 | if (s->fat_type==32) { | |
1654 | uint32_t* entry=((uint32_t*)s->fat2)+cluster; | |
1655 | return le32_to_cpu(*entry); | |
1656 | } else if (s->fat_type==16) { | |
1657 | uint16_t* entry=((uint16_t*)s->fat2)+cluster; | |
1658 | return le16_to_cpu(*entry); | |
1659 | } else { | |
1660 | const uint8_t* x=s->fat2+cluster*3/2; | |
1661 | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) | |
1666 | { | |
1667 | int was_modified = 0; | |
1668 | int i, dummy; | |
1669 | ||
1670 | if (s->qcow == NULL) | |
de167e41 | 1671 | return 0; |
a046433a FB |
1672 | |
1673 | for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) | |
7704df98 | 1674 | was_modified = bdrv_is_allocated(s->qcow, |
a046433a FB |
1675 | cluster2sector(s, cluster_num) + i, 1, &dummy); |
1676 | ||
1677 | return was_modified; | |
de167e41 FB |
1678 | } |
1679 | ||
a046433a | 1680 | static const char* get_basename(const char* path) |
de167e41 | 1681 | { |
a046433a FB |
1682 | char* basename = strrchr(path, '/'); |
1683 | if (basename == NULL) | |
1684 | return path; | |
1685 | else | |
1686 | return basename + 1; /* strip '/' */ | |
de167e41 FB |
1687 | } |
1688 | ||
a046433a FB |
1689 | /* |
1690 | * The array s->used_clusters holds the states of the clusters. If it is | |
1691 | * part of a file, it has bit 2 set, in case of a directory, bit 1. If it | |
1692 | * was modified, bit 3 is set. | |
1693 | * If any cluster is allocated, but not part of a file or directory, this | |
1694 | * driver refuses to commit. | |
1695 | */ | |
1696 | typedef enum { | |
1697 | USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 | |
c227f099 | 1698 | } used_t; |
de167e41 | 1699 | |
a046433a FB |
1700 | /* |
1701 | * get_cluster_count_for_direntry() not only determines how many clusters | |
1702 | * are occupied by direntry, but also if it was renamed or modified. | |
1703 | * | |
1704 | * A file is thought to be renamed *only* if there already was a file with | |
1705 | * exactly the same first cluster, but a different name. | |
1706 | * | |
1707 | * Further, the files/directories handled by this function are | |
1708 | * assumed to be *not* deleted (and *only* those). | |
1709 | */ | |
1710 | static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s, | |
c227f099 | 1711 | direntry_t* direntry, const char* path) |
de167e41 | 1712 | { |
a046433a FB |
1713 | /* |
1714 | * This is a little bit tricky: | |
1715 | * IF the guest OS just inserts a cluster into the file chain, | |
1716 | * and leaves the rest alone, (i.e. the original file had clusters | |
1717 | * 15 -> 16, but now has 15 -> 32 -> 16), then the following happens: | |
1718 | * | |
1719 | * - do_commit will write the cluster into the file at the given | |
1720 | * offset, but | |
1721 | * | |
1722 | * - the cluster which is overwritten should be moved to a later | |
1723 | * position in the file. | |
1724 | * | |
1725 | * I am not aware that any OS does something as braindead, but this | |
1726 | * situation could happen anyway when not committing for a long time. | |
1727 | * Just to be sure that this does not bite us, detect it, and copy the | |
1728 | * contents of the clusters to-be-overwritten into the qcow. | |
1729 | */ | |
1730 | int copy_it = 0; | |
1731 | int was_modified = 0; | |
1732 | int32_t ret = 0; | |
1733 | ||
1734 | uint32_t cluster_num = begin_of_direntry(direntry); | |
1735 | uint32_t offset = 0; | |
1736 | int first_mapping_index = -1; | |
c227f099 | 1737 | mapping_t* mapping = NULL; |
a046433a | 1738 | const char* basename2 = NULL; |
de167e41 | 1739 | |
a046433a | 1740 | vvfat_close_current_file(s); |
de167e41 | 1741 | |
a046433a FB |
1742 | /* the root directory */ |
1743 | if (cluster_num == 0) | |
de167e41 | 1744 | return 0; |
de167e41 | 1745 | |
a046433a FB |
1746 | /* write support */ |
1747 | if (s->qcow) { | |
1748 | basename2 = get_basename(path); | |
de167e41 | 1749 | |
a046433a FB |
1750 | mapping = find_mapping_for_cluster(s, cluster_num); |
1751 | ||
1752 | if (mapping) { | |
da2414e9 FB |
1753 | const char* basename; |
1754 | ||
a046433a FB |
1755 | assert(mapping->mode & MODE_DELETED); |
1756 | mapping->mode &= ~MODE_DELETED; | |
1757 | ||
da2414e9 | 1758 | basename = get_basename(mapping->path); |
a046433a FB |
1759 | |
1760 | assert(mapping->mode & MODE_NORMAL); | |
1761 | ||
1762 | /* rename */ | |
1763 | if (strcmp(basename, basename2)) | |
7267c094 | 1764 | schedule_rename(s, cluster_num, g_strdup(path)); |
a046433a FB |
1765 | } else if (is_file(direntry)) |
1766 | /* new file */ | |
7267c094 | 1767 | schedule_new_file(s, g_strdup(path), cluster_num); |
a046433a | 1768 | else { |
43dc2a64 | 1769 | abort(); |
a046433a FB |
1770 | return 0; |
1771 | } | |
de167e41 FB |
1772 | } |
1773 | ||
a046433a FB |
1774 | while(1) { |
1775 | if (s->qcow) { | |
1776 | if (!copy_it && cluster_was_modified(s, cluster_num)) { | |
1777 | if (mapping == NULL || | |
1778 | mapping->begin > cluster_num || | |
1779 | mapping->end <= cluster_num) | |
1780 | mapping = find_mapping_for_cluster(s, cluster_num); | |
de167e41 | 1781 | |
a046433a FB |
1782 | |
1783 | if (mapping && | |
1784 | (mapping->mode & MODE_DIRECTORY) == 0) { | |
1785 | ||
1786 | /* was modified in qcow */ | |
1787 | if (offset != mapping->info.file.offset + s->cluster_size | |
1788 | * (cluster_num - mapping->begin)) { | |
1789 | /* offset of this cluster in file chain has changed */ | |
43dc2a64 | 1790 | abort(); |
a046433a FB |
1791 | copy_it = 1; |
1792 | } else if (offset == 0) { | |
1793 | const char* basename = get_basename(mapping->path); | |
1794 | ||
1795 | if (strcmp(basename, basename2)) | |
1796 | copy_it = 1; | |
1797 | first_mapping_index = array_index(&(s->mapping), mapping); | |
1798 | } | |
1799 | ||
1800 | if (mapping->first_mapping_index != first_mapping_index | |
1801 | && mapping->info.file.offset > 0) { | |
43dc2a64 | 1802 | abort(); |
a046433a FB |
1803 | copy_it = 1; |
1804 | } | |
1805 | ||
1806 | /* need to write out? */ | |
1807 | if (!was_modified && is_file(direntry)) { | |
1808 | was_modified = 1; | |
1809 | schedule_writeout(s, mapping->dir_index, offset); | |
1810 | } | |
1811 | } | |
1812 | } | |
1813 | ||
1814 | if (copy_it) { | |
1815 | int i, dummy; | |
1816 | /* | |
1817 | * This is horribly inefficient, but that is okay, since | |
1818 | * it is rarely executed, if at all. | |
1819 | */ | |
1820 | int64_t offset = cluster2sector(s, cluster_num); | |
1821 | ||
1822 | vvfat_close_current_file(s); | |
7704df98 KW |
1823 | for (i = 0; i < s->sectors_per_cluster; i++) { |
1824 | if (!bdrv_is_allocated(s->qcow, offset + i, 1, &dummy)) { | |
1825 | if (vvfat_read(s->bs, offset, s->cluster_buffer, 1)) { | |
1826 | return -1; | |
1827 | } | |
1828 | if (bdrv_write(s->qcow, offset, s->cluster_buffer, 1)) { | |
1829 | return -2; | |
1830 | } | |
1831 | } | |
1832 | } | |
a046433a FB |
1833 | } |
1834 | } | |
1835 | ||
1836 | ret++; | |
1837 | if (s->used_clusters[cluster_num] & USED_ANY) | |
1838 | return 0; | |
1839 | s->used_clusters[cluster_num] = USED_FILE; | |
1840 | ||
1841 | cluster_num = modified_fat_get(s, cluster_num); | |
1842 | ||
1843 | if (fat_eof(s, cluster_num)) | |
1844 | return ret; | |
1845 | else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) | |
1846 | return -1; | |
1847 | ||
1848 | offset += s->cluster_size; | |
1849 | } | |
de167e41 FB |
1850 | } |
1851 | ||
a046433a | 1852 | /* |
5fafdf24 | 1853 | * This function looks at the modified data (qcow). |
a046433a FB |
1854 | * It returns 0 upon inconsistency or error, and the number of clusters |
1855 | * used by the directory, its subdirectories and their files. | |
1856 | */ | |
1857 | static int check_directory_consistency(BDRVVVFATState *s, | |
1858 | int cluster_num, const char* path) | |
de167e41 | 1859 | { |
a046433a | 1860 | int ret = 0; |
7267c094 | 1861 | unsigned char* cluster = g_malloc(s->cluster_size); |
c227f099 AL |
1862 | direntry_t* direntries = (direntry_t*)cluster; |
1863 | mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); | |
a046433a FB |
1864 | |
1865 | long_file_name lfn; | |
1866 | int path_len = strlen(path); | |
0d460d6f | 1867 | char path2[PATH_MAX + 1]; |
a046433a FB |
1868 | |
1869 | assert(path_len < PATH_MAX); /* len was tested before! */ | |
363a37d5 | 1870 | pstrcpy(path2, sizeof(path2), path); |
a046433a FB |
1871 | path2[path_len] = '/'; |
1872 | path2[path_len + 1] = '\0'; | |
1873 | ||
1874 | if (mapping) { | |
1875 | const char* basename = get_basename(mapping->path); | |
1876 | const char* basename2 = get_basename(path); | |
1877 | ||
1878 | assert(mapping->mode & MODE_DIRECTORY); | |
1879 | ||
1880 | assert(mapping->mode & MODE_DELETED); | |
1881 | mapping->mode &= ~MODE_DELETED; | |
1882 | ||
1883 | if (strcmp(basename, basename2)) | |
7267c094 | 1884 | schedule_rename(s, cluster_num, g_strdup(path)); |
a046433a FB |
1885 | } else |
1886 | /* new directory */ | |
7267c094 | 1887 | schedule_mkdir(s, cluster_num, g_strdup(path)); |
3b46e624 | 1888 | |
a046433a FB |
1889 | lfn_init(&lfn); |
1890 | do { | |
de167e41 | 1891 | int i; |
a046433a FB |
1892 | int subret = 0; |
1893 | ||
1894 | ret++; | |
1895 | ||
1896 | if (s->used_clusters[cluster_num] & USED_ANY) { | |
1897 | fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); | |
6262bbd3 | 1898 | goto fail; |
a046433a FB |
1899 | } |
1900 | s->used_clusters[cluster_num] = USED_DIRECTORY; | |
1901 | ||
1902 | DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); | |
1903 | subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, | |
1904 | s->sectors_per_cluster); | |
1905 | if (subret) { | |
1906 | fprintf(stderr, "Error fetching direntries\n"); | |
1907 | fail: | |
ce137829 | 1908 | g_free(cluster); |
a046433a FB |
1909 | return 0; |
1910 | } | |
1911 | ||
1912 | for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { | |
3f4cb3d3 | 1913 | int cluster_count = 0; |
a046433a | 1914 | |
b2bedb21 | 1915 | DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i)); |
a046433a FB |
1916 | if (is_volume_label(direntries + i) || is_dot(direntries + i) || |
1917 | is_free(direntries + i)) | |
1918 | continue; | |
1919 | ||
1920 | subret = parse_long_name(&lfn, direntries + i); | |
1921 | if (subret < 0) { | |
1922 | fprintf(stderr, "Error in long name\n"); | |
1923 | goto fail; | |
de167e41 | 1924 | } |
a046433a FB |
1925 | if (subret == 0 || is_free(direntries + i)) |
1926 | continue; | |
1927 | ||
1928 | if (fat_chksum(direntries+i) != lfn.checksum) { | |
1929 | subret = parse_short_name(s, &lfn, direntries + i); | |
1930 | if (subret < 0) { | |
1931 | fprintf(stderr, "Error in short name (%d)\n", subret); | |
1932 | goto fail; | |
1933 | } | |
ffe8ab83 TS |
1934 | if (subret > 0 || !strcmp((char*)lfn.name, ".") |
1935 | || !strcmp((char*)lfn.name, "..")) | |
a046433a FB |
1936 | continue; |
1937 | } | |
1938 | lfn.checksum = 0x100; /* cannot use long name twice */ | |
1939 | ||
1940 | if (path_len + 1 + lfn.len >= PATH_MAX) { | |
1941 | fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name); | |
1942 | goto fail; | |
1943 | } | |
363a37d5 BS |
1944 | pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1, |
1945 | (char*)lfn.name); | |
a046433a FB |
1946 | |
1947 | if (is_directory(direntries + i)) { | |
1948 | if (begin_of_direntry(direntries + i) == 0) { | |
1949 | DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i)); | |
1950 | goto fail; | |
1951 | } | |
1952 | cluster_count = check_directory_consistency(s, | |
1953 | begin_of_direntry(direntries + i), path2); | |
1954 | if (cluster_count == 0) { | |
1955 | DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i)); | |
1956 | goto fail; | |
1957 | } | |
1958 | } else if (is_file(direntries + i)) { | |
1959 | /* check file size with FAT */ | |
1960 | cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); | |
1961 | if (cluster_count != | |
1962 | (le32_to_cpu(direntries[i].size) + s->cluster_size | |
1963 | - 1) / s->cluster_size) { | |
1964 | DLOG(fprintf(stderr, "Cluster count mismatch\n")); | |
1965 | goto fail; | |
1966 | } | |
1967 | } else | |
43dc2a64 | 1968 | abort(); /* cluster_count = 0; */ |
a046433a FB |
1969 | |
1970 | ret += cluster_count; | |
de167e41 | 1971 | } |
de167e41 | 1972 | |
a046433a FB |
1973 | cluster_num = modified_fat_get(s, cluster_num); |
1974 | } while(!fat_eof(s, cluster_num)); | |
de167e41 | 1975 | |
ce137829 | 1976 | g_free(cluster); |
a046433a FB |
1977 | return ret; |
1978 | } | |
1979 | ||
1980 | /* returns 1 on success */ | |
1981 | static int is_consistent(BDRVVVFATState* s) | |
1982 | { | |
1983 | int i, check; | |
1984 | int used_clusters_count = 0; | |
1985 | ||
1986 | DLOG(checkpoint()); | |
1987 | /* | |
1988 | * - get modified FAT | |
1989 | * - compare the two FATs (TODO) | |
1990 | * - get buffer for marking used clusters | |
1991 | * - recurse direntries from root (using bs->bdrv_read to make | |
1992 | * sure to get the new data) | |
1993 | * - check that the FAT agrees with the size | |
1994 | * - count the number of clusters occupied by this directory and | |
1995 | * its files | |
1996 | * - check that the cumulative used cluster count agrees with the | |
1997 | * FAT | |
1998 | * - if all is fine, return number of used clusters | |
1999 | */ | |
2000 | if (s->fat2 == NULL) { | |
2001 | int size = 0x200 * s->sectors_per_fat; | |
7267c094 | 2002 | s->fat2 = g_malloc(size); |
a046433a FB |
2003 | memcpy(s->fat2, s->fat.pointer, size); |
2004 | } | |
2005 | check = vvfat_read(s->bs, | |
2006 | s->first_sectors_number, s->fat2, s->sectors_per_fat); | |
2007 | if (check) { | |
2008 | fprintf(stderr, "Could not copy fat\n"); | |
2009 | return 0; | |
2010 | } | |
2011 | assert (s->used_clusters); | |
2012 | for (i = 0; i < sector2cluster(s, s->sector_count); i++) | |
2013 | s->used_clusters[i] &= ~USED_ANY; | |
2014 | ||
2015 | clear_commits(s); | |
2016 | ||
2017 | /* mark every mapped file/directory as deleted. | |
2018 | * (check_directory_consistency() will unmark those still present). */ | |
2019 | if (s->qcow) | |
2020 | for (i = 0; i < s->mapping.next; i++) { | |
c227f099 | 2021 | mapping_t* mapping = array_get(&(s->mapping), i); |
a046433a FB |
2022 | if (mapping->first_mapping_index < 0) |
2023 | mapping->mode |= MODE_DELETED; | |
de167e41 | 2024 | } |
a046433a FB |
2025 | |
2026 | used_clusters_count = check_directory_consistency(s, 0, s->path); | |
2027 | if (used_clusters_count <= 0) { | |
2028 | DLOG(fprintf(stderr, "problem in directory\n")); | |
2029 | return 0; | |
de167e41 FB |
2030 | } |
2031 | ||
a046433a FB |
2032 | check = s->last_cluster_of_root_directory; |
2033 | for (i = check; i < sector2cluster(s, s->sector_count); i++) { | |
2034 | if (modified_fat_get(s, i)) { | |
2035 | if(!s->used_clusters[i]) { | |
2036 | DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i)); | |
2037 | return 0; | |
2038 | } | |
2039 | check++; | |
2040 | } | |
2041 | ||
2042 | if (s->used_clusters[i] == USED_ALLOCATED) { | |
2043 | /* allocated, but not used... */ | |
2044 | DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i)); | |
2045 | return 0; | |
2046 | } | |
2047 | } | |
2048 | ||
2049 | if (check != used_clusters_count) | |
2050 | return 0; | |
2051 | ||
2052 | return used_clusters_count; | |
2053 | } | |
2054 | ||
2055 | static inline void adjust_mapping_indices(BDRVVVFATState* s, | |
2056 | int offset, int adjust) | |
2057 | { | |
2058 | int i; | |
2059 | ||
2060 | for (i = 0; i < s->mapping.next; i++) { | |
c227f099 | 2061 | mapping_t* mapping = array_get(&(s->mapping), i); |
a046433a FB |
2062 | |
2063 | #define ADJUST_MAPPING_INDEX(name) \ | |
2064 | if (mapping->name >= offset) \ | |
2065 | mapping->name += adjust | |
2066 | ||
2067 | ADJUST_MAPPING_INDEX(first_mapping_index); | |
2068 | if (mapping->mode & MODE_DIRECTORY) | |
2069 | ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); | |
de167e41 | 2070 | } |
a046433a FB |
2071 | } |
2072 | ||
2073 | /* insert or update mapping */ | |
c227f099 | 2074 | static mapping_t* insert_mapping(BDRVVVFATState* s, |
a046433a FB |
2075 | uint32_t begin, uint32_t end) |
2076 | { | |
2077 | /* | |
2078 | * - find mapping where mapping->begin >= begin, | |
2079 | * - if mapping->begin > begin: insert | |
2080 | * - adjust all references to mappings! | |
2081 | * - else: adjust | |
2082 | * - replace name | |
2083 | */ | |
2084 | int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); | |
c227f099 AL |
2085 | mapping_t* mapping = NULL; |
2086 | mapping_t* first_mapping = array_get(&(s->mapping), 0); | |
a046433a FB |
2087 | |
2088 | if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index)) | |
2089 | && mapping->begin < begin) { | |
2090 | mapping->end = begin; | |
2091 | index++; | |
2092 | mapping = array_get(&(s->mapping), index); | |
2093 | } | |
2094 | if (index >= s->mapping.next || mapping->begin > begin) { | |
2095 | mapping = array_insert(&(s->mapping), index, 1); | |
2096 | mapping->path = NULL; | |
2097 | adjust_mapping_indices(s, index, +1); | |
2098 | } | |
2099 | ||
2100 | mapping->begin = begin; | |
2101 | mapping->end = end; | |
de167e41 | 2102 | |
c227f099 | 2103 | DLOG(mapping_t* next_mapping; |
a046433a FB |
2104 | assert(index + 1 >= s->mapping.next || |
2105 | ((next_mapping = array_get(&(s->mapping), index + 1)) && | |
2106 | next_mapping->begin >= end))); | |
2107 | ||
c227f099 | 2108 | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer) |
a046433a FB |
2109 | s->current_mapping = array_get(&(s->mapping), |
2110 | s->current_mapping - first_mapping); | |
2111 | ||
2112 | return mapping; | |
2113 | } | |
2114 | ||
2115 | static int remove_mapping(BDRVVVFATState* s, int mapping_index) | |
2116 | { | |
c227f099 AL |
2117 | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
2118 | mapping_t* first_mapping = array_get(&(s->mapping), 0); | |
a046433a FB |
2119 | |
2120 | /* free mapping */ | |
ce137829 SW |
2121 | if (mapping->first_mapping_index < 0) { |
2122 | g_free(mapping->path); | |
2123 | } | |
a046433a FB |
2124 | |
2125 | /* remove from s->mapping */ | |
2126 | array_remove(&(s->mapping), mapping_index); | |
2127 | ||
2128 | /* adjust all references to mappings */ | |
2129 | adjust_mapping_indices(s, mapping_index, -1); | |
2130 | ||
c227f099 | 2131 | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer) |
a046433a FB |
2132 | s->current_mapping = array_get(&(s->mapping), |
2133 | s->current_mapping - first_mapping); | |
de167e41 | 2134 | |
de167e41 FB |
2135 | return 0; |
2136 | } | |
2137 | ||
a046433a FB |
2138 | static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
2139 | { | |
2140 | int i; | |
2141 | for (i = 0; i < s->mapping.next; i++) { | |
c227f099 | 2142 | mapping_t* mapping = array_get(&(s->mapping), i); |
a046433a FB |
2143 | if (mapping->dir_index >= offset) |
2144 | mapping->dir_index += adjust; | |
2145 | if ((mapping->mode & MODE_DIRECTORY) && | |
2146 | mapping->info.dir.first_dir_index >= offset) | |
2147 | mapping->info.dir.first_dir_index += adjust; | |
2148 | } | |
2149 | } | |
de167e41 | 2150 | |
c227f099 | 2151 | static direntry_t* insert_direntries(BDRVVVFATState* s, |
a046433a | 2152 | int dir_index, int count) |
de167e41 | 2153 | { |
a046433a FB |
2154 | /* |
2155 | * make room in s->directory, | |
2156 | * adjust_dirindices | |
2157 | */ | |
c227f099 | 2158 | direntry_t* result = array_insert(&(s->directory), dir_index, count); |
a046433a FB |
2159 | if (result == NULL) |
2160 | return NULL; | |
2161 | adjust_dirindices(s, dir_index, count); | |
de167e41 FB |
2162 | return result; |
2163 | } | |
2164 | ||
a046433a FB |
2165 | static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
2166 | { | |
2167 | int ret = array_remove_slice(&(s->directory), dir_index, count); | |
2168 | if (ret) | |
2169 | return ret; | |
2170 | adjust_dirindices(s, dir_index, -count); | |
2171 | return 0; | |
2172 | } | |
de167e41 | 2173 | |
a046433a FB |
2174 | /* |
2175 | * Adapt the mappings of the cluster chain starting at first cluster | |
2176 | * (i.e. if a file starts at first_cluster, the chain is followed according | |
2177 | * to the modified fat, and the corresponding entries in s->mapping are | |
2178 | * adjusted) | |
2179 | */ | |
2180 | static int commit_mappings(BDRVVVFATState* s, | |
2181 | uint32_t first_cluster, int dir_index) | |
de167e41 | 2182 | { |
c227f099 AL |
2183 | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2184 | direntry_t* direntry = array_get(&(s->directory), dir_index); | |
a046433a FB |
2185 | uint32_t cluster = first_cluster; |
2186 | ||
2187 | vvfat_close_current_file(s); | |
2188 | ||
2189 | assert(mapping); | |
2190 | assert(mapping->begin == first_cluster); | |
2191 | mapping->first_mapping_index = -1; | |
2192 | mapping->dir_index = dir_index; | |
2193 | mapping->mode = (dir_index <= 0 || is_directory(direntry)) ? | |
2194 | MODE_DIRECTORY : MODE_NORMAL; | |
2195 | ||
2196 | while (!fat_eof(s, cluster)) { | |
2197 | uint32_t c, c1; | |
2198 | ||
2199 | for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; | |
2200 | c = c1, c1 = modified_fat_get(s, c1)); | |
2201 | ||
2202 | c++; | |
2203 | if (c > mapping->end) { | |
2204 | int index = array_index(&(s->mapping), mapping); | |
2205 | int i, max_i = s->mapping.next - index; | |
2206 | for (i = 1; i < max_i && mapping[i].begin < c; i++); | |
2207 | while (--i > 0) | |
2208 | remove_mapping(s, index + 1); | |
2209 | } | |
2210 | assert(mapping == array_get(&(s->mapping), s->mapping.next - 1) | |
2211 | || mapping[1].begin >= c); | |
2212 | mapping->end = c; | |
2213 | ||
2214 | if (!fat_eof(s, c1)) { | |
2215 | int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); | |
c227f099 | 2216 | mapping_t* next_mapping = i >= s->mapping.next ? NULL : |
a046433a FB |
2217 | array_get(&(s->mapping), i); |
2218 | ||
2219 | if (next_mapping == NULL || next_mapping->begin > c1) { | |
2220 | int i1 = array_index(&(s->mapping), mapping); | |
2221 | ||
2222 | next_mapping = insert_mapping(s, c1, c1+1); | |
2223 | ||
2224 | if (c1 < c) | |
2225 | i1++; | |
2226 | mapping = array_get(&(s->mapping), i1); | |
2227 | } | |
2228 | ||
2229 | next_mapping->dir_index = mapping->dir_index; | |
5fafdf24 | 2230 | next_mapping->first_mapping_index = |
a046433a FB |
2231 | mapping->first_mapping_index < 0 ? |
2232 | array_index(&(s->mapping), mapping) : | |
2233 | mapping->first_mapping_index; | |
2234 | next_mapping->path = mapping->path; | |
2235 | next_mapping->mode = mapping->mode; | |
2236 | next_mapping->read_only = mapping->read_only; | |
2237 | if (mapping->mode & MODE_DIRECTORY) { | |
2238 | next_mapping->info.dir.parent_mapping_index = | |
2239 | mapping->info.dir.parent_mapping_index; | |
2240 | next_mapping->info.dir.first_dir_index = | |
2241 | mapping->info.dir.first_dir_index + | |
2242 | 0x10 * s->sectors_per_cluster * | |
2243 | (mapping->end - mapping->begin); | |
2244 | } else | |
2245 | next_mapping->info.file.offset = mapping->info.file.offset + | |
2246 | mapping->end - mapping->begin; | |
2247 | ||
2248 | mapping = next_mapping; | |
2249 | } | |
3b46e624 | 2250 | |
a046433a FB |
2251 | cluster = c1; |
2252 | } | |
de167e41 | 2253 | |
de167e41 FB |
2254 | return 0; |
2255 | } | |
2256 | ||
a046433a FB |
2257 | static int commit_direntries(BDRVVVFATState* s, |
2258 | int dir_index, int parent_mapping_index) | |
de167e41 | 2259 | { |
c227f099 | 2260 | direntry_t* direntry = array_get(&(s->directory), dir_index); |
a046433a | 2261 | uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
c227f099 | 2262 | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
a046433a FB |
2263 | |
2264 | int factor = 0x10 * s->sectors_per_cluster; | |
2265 | int old_cluster_count, new_cluster_count; | |
2266 | int current_dir_index = mapping->info.dir.first_dir_index; | |
2267 | int first_dir_index = current_dir_index; | |
2268 | int ret, i; | |
2269 | uint32_t c; | |
2270 | ||
2271 | DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index)); | |
2272 | ||
2273 | assert(direntry); | |
2274 | assert(mapping); | |
2275 | assert(mapping->begin == first_cluster); | |
2276 | assert(mapping->info.dir.first_dir_index < s->directory.next); | |
2277 | assert(mapping->mode & MODE_DIRECTORY); | |
2278 | assert(dir_index == 0 || is_directory(direntry)); | |
2279 | ||
2280 | mapping->info.dir.parent_mapping_index = parent_mapping_index; | |
2281 | ||
2282 | if (first_cluster == 0) { | |
2283 | old_cluster_count = new_cluster_count = | |
2284 | s->last_cluster_of_root_directory; | |
2285 | } else { | |
2286 | for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); | |
2287 | c = fat_get(s, c)) | |
2288 | old_cluster_count++; | |
de167e41 | 2289 | |
a046433a FB |
2290 | for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2291 | c = modified_fat_get(s, c)) | |
2292 | new_cluster_count++; | |
2293 | } | |
de167e41 | 2294 | |
a046433a FB |
2295 | if (new_cluster_count > old_cluster_count) { |
2296 | if (insert_direntries(s, | |
2297 | current_dir_index + factor * old_cluster_count, | |
2298 | factor * (new_cluster_count - old_cluster_count)) == NULL) | |
2299 | return -1; | |
2300 | } else if (new_cluster_count < old_cluster_count) | |
2301 | remove_direntries(s, | |
2302 | current_dir_index + factor * new_cluster_count, | |
2303 | factor * (old_cluster_count - new_cluster_count)); | |
2304 | ||
2305 | for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) { | |
ebb72c9f | 2306 | direntry_t *first_direntry; |
a046433a FB |
2307 | void* direntry = array_get(&(s->directory), current_dir_index); |
2308 | int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry, | |
2309 | s->sectors_per_cluster); | |
2310 | if (ret) | |
2311 | return ret; | |
ebb72c9f KW |
2312 | |
2313 | /* The first directory entry on the filesystem is the volume name */ | |
2314 | first_direntry = (direntry_t*) s->directory.pointer; | |
2315 | assert(!memcmp(first_direntry->name, s->volume_label, 11)); | |
2316 | ||
a046433a FB |
2317 | current_dir_index += factor; |
2318 | } | |
de167e41 | 2319 | |
a046433a FB |
2320 | ret = commit_mappings(s, first_cluster, dir_index); |
2321 | if (ret) | |
2322 | return ret; | |
2323 | ||
2324 | /* recurse */ | |
2325 | for (i = 0; i < factor * new_cluster_count; i++) { | |
2326 | direntry = array_get(&(s->directory), first_dir_index + i); | |
2327 | if (is_directory(direntry) && !is_dot(direntry)) { | |
2328 | mapping = find_mapping_for_cluster(s, first_cluster); | |
2329 | assert(mapping->mode & MODE_DIRECTORY); | |
2330 | ret = commit_direntries(s, first_dir_index + i, | |
2331 | array_index(&(s->mapping), mapping)); | |
2332 | if (ret) | |
2333 | return ret; | |
2334 | } | |
2335 | } | |
de167e41 | 2336 | |
a046433a FB |
2337 | return 0; |
2338 | } | |
de167e41 | 2339 | |
a046433a FB |
2340 | /* commit one file (adjust contents, adjust mapping), |
2341 | return first_mapping_index */ | |
2342 | static int commit_one_file(BDRVVVFATState* s, | |
2343 | int dir_index, uint32_t offset) | |
2344 | { | |
c227f099 | 2345 | direntry_t* direntry = array_get(&(s->directory), dir_index); |
a046433a FB |
2346 | uint32_t c = begin_of_direntry(direntry); |
2347 | uint32_t first_cluster = c; | |
c227f099 | 2348 | mapping_t* mapping = find_mapping_for_cluster(s, c); |
a046433a | 2349 | uint32_t size = filesize_of_direntry(direntry); |
7267c094 | 2350 | char* cluster = g_malloc(s->cluster_size); |
a046433a FB |
2351 | uint32_t i; |
2352 | int fd = 0; | |
2353 | ||
2354 | assert(offset < size); | |
2355 | assert((offset % s->cluster_size) == 0); | |
2356 | ||
2357 | for (i = s->cluster_size; i < offset; i += s->cluster_size) | |
2358 | c = modified_fat_get(s, c); | |
2359 | ||
6165f4d8 | 2360 | fd = qemu_open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666); |
a046433a FB |
2361 | if (fd < 0) { |
2362 | fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path, | |
2363 | strerror(errno), errno); | |
ce137829 | 2364 | g_free(cluster); |
a046433a | 2365 | return fd; |
de167e41 | 2366 | } |
ce137829 SW |
2367 | if (offset > 0) { |
2368 | if (lseek(fd, offset, SEEK_SET) != offset) { | |
2e1e79da | 2369 | qemu_close(fd); |
ce137829 SW |
2370 | g_free(cluster); |
2371 | return -3; | |
2372 | } | |
2373 | } | |
a046433a FB |
2374 | |
2375 | while (offset < size) { | |
2376 | uint32_t c1; | |
2377 | int rest_size = (size - offset > s->cluster_size ? | |
2378 | s->cluster_size : size - offset); | |
2379 | int ret; | |
2380 | ||
2381 | c1 = modified_fat_get(s, c); | |
2382 | ||
2383 | assert((size - offset == 0 && fat_eof(s, c)) || | |
2384 | (size > offset && c >=2 && !fat_eof(s, c))); | |
a046433a FB |
2385 | |
2386 | ret = vvfat_read(s->bs, cluster2sector(s, c), | |
ffe8ab83 | 2387 | (uint8_t*)cluster, (rest_size + 0x1ff) / 0x200); |
a046433a | 2388 | |
ce137829 | 2389 | if (ret < 0) { |
2e1e79da | 2390 | qemu_close(fd); |
ce137829 SW |
2391 | g_free(cluster); |
2392 | return ret; | |
2393 | } | |
a046433a | 2394 | |
ce137829 | 2395 | if (write(fd, cluster, rest_size) < 0) { |
2e1e79da | 2396 | qemu_close(fd); |
ce137829 SW |
2397 | g_free(cluster); |
2398 | return -2; | |
2399 | } | |
a046433a FB |
2400 | |
2401 | offset += rest_size; | |
2402 | c = c1; | |
2403 | } | |
2404 | ||
2dedf83e KS |
2405 | if (ftruncate(fd, size)) { |
2406 | perror("ftruncate()"); | |
2e1e79da | 2407 | qemu_close(fd); |
ce137829 | 2408 | g_free(cluster); |
2dedf83e KS |
2409 | return -4; |
2410 | } | |
2e1e79da | 2411 | qemu_close(fd); |
ce137829 | 2412 | g_free(cluster); |
a046433a FB |
2413 | |
2414 | return commit_mappings(s, first_cluster, dir_index); | |
2415 | } | |
2416 | ||
2417 | #ifdef DEBUG | |
2418 | /* test, if all mappings point to valid direntries */ | |
2419 | static void check1(BDRVVVFATState* s) | |
2420 | { | |
2421 | int i; | |
2422 | for (i = 0; i < s->mapping.next; i++) { | |
c227f099 | 2423 | mapping_t* mapping = array_get(&(s->mapping), i); |
a046433a FB |
2424 | if (mapping->mode & MODE_DELETED) { |
2425 | fprintf(stderr, "deleted\n"); | |
2426 | continue; | |
2427 | } | |
a046433a | 2428 | assert(mapping->dir_index < s->directory.next); |
c227f099 | 2429 | direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
a046433a FB |
2430 | assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0); |
2431 | if (mapping->mode & MODE_DIRECTORY) { | |
2432 | assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next); | |
2433 | assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); | |
de167e41 FB |
2434 | } |
2435 | } | |
de167e41 FB |
2436 | } |
2437 | ||
a046433a FB |
2438 | /* test, if all direntries have mappings */ |
2439 | static void check2(BDRVVVFATState* s) | |
de167e41 | 2440 | { |
de167e41 | 2441 | int i; |
a046433a | 2442 | int first_mapping = -1; |
de167e41 | 2443 | |
a046433a | 2444 | for (i = 0; i < s->directory.next; i++) { |
c227f099 | 2445 | direntry_t* direntry = array_get(&(s->directory), i); |
de167e41 | 2446 | |
a046433a | 2447 | if (is_short_name(direntry) && begin_of_direntry(direntry)) { |
c227f099 | 2448 | mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
a046433a FB |
2449 | assert(mapping); |
2450 | assert(mapping->dir_index == i || is_dot(direntry)); | |
2451 | assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); | |
2452 | } | |
de167e41 | 2453 | |
a046433a FB |
2454 | if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
2455 | /* cluster start */ | |
2456 | int j, count = 0; | |
de167e41 | 2457 | |
a046433a | 2458 | for (j = 0; j < s->mapping.next; j++) { |
c227f099 | 2459 | mapping_t* mapping = array_get(&(s->mapping), j); |
a046433a | 2460 | if (mapping->mode & MODE_DELETED) |
de167e41 | 2461 | continue; |
a046433a FB |
2462 | if (mapping->mode & MODE_DIRECTORY) { |
2463 | if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { | |
2464 | assert(++count == 1); | |
2465 | if (mapping->first_mapping_index == -1) | |
2466 | first_mapping = array_index(&(s->mapping), mapping); | |
2467 | else | |
2468 | assert(first_mapping == mapping->first_mapping_index); | |
2469 | if (mapping->info.dir.parent_mapping_index < 0) | |
2470 | assert(j == 0); | |
2471 | else { | |
c227f099 | 2472 | mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
a046433a FB |
2473 | assert(parent->mode & MODE_DIRECTORY); |
2474 | assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); | |
2475 | } | |
2476 | } | |
de167e41 | 2477 | } |
a046433a FB |
2478 | } |
2479 | if (count == 0) | |
2480 | first_mapping = -1; | |
2481 | } | |
2482 | } | |
2483 | } | |
2484 | #endif | |
de167e41 | 2485 | |
a046433a FB |
2486 | static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
2487 | { | |
2488 | int i; | |
de167e41 | 2489 | |
a046433a FB |
2490 | #ifdef DEBUG |
2491 | fprintf(stderr, "handle_renames\n"); | |
2492 | for (i = 0; i < s->commits.next; i++) { | |
c227f099 | 2493 | commit_t* commit = array_get(&(s->commits), i); |
a046433a FB |
2494 | fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
2495 | } | |
2496 | #endif | |
2497 | ||
2498 | for (i = 0; i < s->commits.next;) { | |
c227f099 | 2499 | commit_t* commit = array_get(&(s->commits), i); |
a046433a | 2500 | if (commit->action == ACTION_RENAME) { |
c227f099 | 2501 | mapping_t* mapping = find_mapping_for_cluster(s, |
a046433a FB |
2502 | commit->param.rename.cluster); |
2503 | char* old_path = mapping->path; | |
2504 | ||
2505 | assert(commit->path); | |
2506 | mapping->path = commit->path; | |
2507 | if (rename(old_path, mapping->path)) | |
2508 | return -2; | |
2509 | ||
2510 | if (mapping->mode & MODE_DIRECTORY) { | |
2511 | int l1 = strlen(mapping->path); | |
2512 | int l2 = strlen(old_path); | |
2513 | int diff = l1 - l2; | |
c227f099 | 2514 | direntry_t* direntry = array_get(&(s->directory), |
a046433a FB |
2515 | mapping->info.dir.first_dir_index); |
2516 | uint32_t c = mapping->begin; | |
2517 | int i = 0; | |
2518 | ||
2519 | /* recurse */ | |
2520 | while (!fat_eof(s, c)) { | |
2521 | do { | |
c227f099 | 2522 | direntry_t* d = direntry + i; |
a046433a FB |
2523 | |
2524 | if (is_file(d) || (is_directory(d) && !is_dot(d))) { | |
c227f099 | 2525 | mapping_t* m = find_mapping_for_cluster(s, |
a046433a FB |
2526 | begin_of_direntry(d)); |
2527 | int l = strlen(m->path); | |
7267c094 | 2528 | char* new_path = g_malloc(l + diff + 1); |
a046433a FB |
2529 | |
2530 | assert(!strncmp(m->path, mapping->path, l2)); | |
2531 | ||
363a37d5 BS |
2532 | pstrcpy(new_path, l + diff + 1, mapping->path); |
2533 | pstrcpy(new_path + l1, l + diff + 1 - l1, | |
2534 | m->path + l2); | |
a046433a FB |
2535 | |
2536 | schedule_rename(s, m->begin, new_path); | |
de167e41 | 2537 | } |
a046433a FB |
2538 | i++; |
2539 | } while((i % (0x10 * s->sectors_per_cluster)) != 0); | |
2540 | c = fat_get(s, c); | |
de167e41 FB |
2541 | } |
2542 | } | |
de167e41 | 2543 | |
ce137829 | 2544 | g_free(old_path); |
a046433a FB |
2545 | array_remove(&(s->commits), i); |
2546 | continue; | |
2547 | } else if (commit->action == ACTION_MKDIR) { | |
c227f099 | 2548 | mapping_t* mapping; |
a046433a FB |
2549 | int j, parent_path_len; |
2550 | ||
48c2f068 FB |
2551 | #ifdef __MINGW32__ |
2552 | if (mkdir(commit->path)) | |
2553 | return -5; | |
2554 | #else | |
2555 | if (mkdir(commit->path, 0755)) | |
2556 | return -5; | |
2557 | #endif | |
a046433a FB |
2558 | |
2559 | mapping = insert_mapping(s, commit->param.mkdir.cluster, | |
2560 | commit->param.mkdir.cluster + 1); | |
2561 | if (mapping == NULL) | |
2562 | return -6; | |
2563 | ||
2564 | mapping->mode = MODE_DIRECTORY; | |
2565 | mapping->read_only = 0; | |
2566 | mapping->path = commit->path; | |
2567 | j = s->directory.next; | |
2568 | assert(j); | |
2569 | insert_direntries(s, s->directory.next, | |
2570 | 0x10 * s->sectors_per_cluster); | |
2571 | mapping->info.dir.first_dir_index = j; | |
2572 | ||
2573 | parent_path_len = strlen(commit->path) | |
2574 | - strlen(get_basename(commit->path)) - 1; | |
2575 | for (j = 0; j < s->mapping.next; j++) { | |
c227f099 | 2576 | mapping_t* m = array_get(&(s->mapping), j); |
a046433a FB |
2577 | if (m->first_mapping_index < 0 && m != mapping && |
2578 | !strncmp(m->path, mapping->path, parent_path_len) && | |
2579 | strlen(m->path) == parent_path_len) | |
2580 | break; | |
2581 | } | |
2582 | assert(j < s->mapping.next); | |
2583 | mapping->info.dir.parent_mapping_index = j; | |
2584 | ||
2585 | array_remove(&(s->commits), i); | |
2586 | continue; | |
2587 | } | |
2588 | ||
2589 | i++; | |
2590 | } | |
2591 | return 0; | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * TODO: make sure that the short name is not matching *another* file | |
2596 | */ | |
2597 | static int handle_commits(BDRVVVFATState* s) | |
2598 | { | |
2599 | int i, fail = 0; | |
2600 | ||
2601 | vvfat_close_current_file(s); | |
2602 | ||
2603 | for (i = 0; !fail && i < s->commits.next; i++) { | |
c227f099 | 2604 | commit_t* commit = array_get(&(s->commits), i); |
a046433a FB |
2605 | switch(commit->action) { |
2606 | case ACTION_RENAME: case ACTION_MKDIR: | |
43dc2a64 | 2607 | abort(); |
a046433a FB |
2608 | fail = -2; |
2609 | break; | |
2610 | case ACTION_WRITEOUT: { | |
a6c6f76c BS |
2611 | #ifndef NDEBUG |
2612 | /* these variables are only used by assert() below */ | |
c227f099 | 2613 | direntry_t* entry = array_get(&(s->directory), |
a046433a FB |
2614 | commit->param.writeout.dir_index); |
2615 | uint32_t begin = begin_of_direntry(entry); | |
c227f099 | 2616 | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
a6c6f76c | 2617 | #endif |
a046433a FB |
2618 | |
2619 | assert(mapping); | |
2620 | assert(mapping->begin == begin); | |
2621 | assert(commit->path == NULL); | |
2622 | ||
2623 | if (commit_one_file(s, commit->param.writeout.dir_index, | |
2624 | commit->param.writeout.modified_offset)) | |
2625 | fail = -3; | |
2626 | ||
2627 | break; | |
2628 | } | |
2629 | case ACTION_NEW_FILE: { | |
2630 | int begin = commit->param.new_file.first_cluster; | |
c227f099 AL |
2631 | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2632 | direntry_t* entry; | |
a046433a | 2633 | int i; |
de167e41 | 2634 | |
a046433a FB |
2635 | /* find direntry */ |
2636 | for (i = 0; i < s->directory.next; i++) { | |
2637 | entry = array_get(&(s->directory), i); | |
2638 | if (is_file(entry) && begin_of_direntry(entry) == begin) | |
2639 | break; | |
de167e41 | 2640 | } |
de167e41 | 2641 | |
a046433a FB |
2642 | if (i >= s->directory.next) { |
2643 | fail = -6; | |
2644 | continue; | |
2645 | } | |
de167e41 | 2646 | |
a046433a FB |
2647 | /* make sure there exists an initial mapping */ |
2648 | if (mapping && mapping->begin != begin) { | |
2649 | mapping->end = begin; | |
2650 | mapping = NULL; | |
2651 | } | |
2652 | if (mapping == NULL) { | |
2653 | mapping = insert_mapping(s, begin, begin+1); | |
2654 | } | |
2655 | /* most members will be fixed in commit_mappings() */ | |
2656 | assert(commit->path); | |
2657 | mapping->path = commit->path; | |
2658 | mapping->read_only = 0; | |
2659 | mapping->mode = MODE_NORMAL; | |
2660 | mapping->info.file.offset = 0; | |
2661 | ||
2662 | if (commit_one_file(s, i, 0)) | |
2663 | fail = -7; | |
2664 | ||
2665 | break; | |
2666 | } | |
2667 | default: | |
43dc2a64 | 2668 | abort(); |
a046433a FB |
2669 | } |
2670 | } | |
2671 | if (i > 0 && array_remove_slice(&(s->commits), 0, i)) | |
2672 | return -1; | |
2673 | return fail; | |
2674 | } | |
2675 | ||
2676 | static int handle_deletes(BDRVVVFATState* s) | |
2677 | { | |
2678 | int i, deferred = 1, deleted = 1; | |
2679 | ||
2680 | /* delete files corresponding to mappings marked as deleted */ | |
2681 | /* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */ | |
2682 | while (deferred && deleted) { | |
2683 | deferred = 0; | |
2684 | deleted = 0; | |
2685 | ||
2686 | for (i = 1; i < s->mapping.next; i++) { | |
c227f099 | 2687 | mapping_t* mapping = array_get(&(s->mapping), i); |
a046433a | 2688 | if (mapping->mode & MODE_DELETED) { |
c227f099 | 2689 | direntry_t* entry = array_get(&(s->directory), |
a046433a FB |
2690 | mapping->dir_index); |
2691 | ||
2692 | if (is_free(entry)) { | |
2693 | /* remove file/directory */ | |
2694 | if (mapping->mode & MODE_DIRECTORY) { | |
2695 | int j, next_dir_index = s->directory.next, | |
2696 | first_dir_index = mapping->info.dir.first_dir_index; | |
2697 | ||
2698 | if (rmdir(mapping->path) < 0) { | |
2699 | if (errno == ENOTEMPTY) { | |
2700 | deferred++; | |
2701 | continue; | |
2702 | } else | |
2703 | return -5; | |
de167e41 | 2704 | } |
a046433a FB |
2705 | |
2706 | for (j = 1; j < s->mapping.next; j++) { | |
c227f099 | 2707 | mapping_t* m = array_get(&(s->mapping), j); |
a046433a FB |
2708 | if (m->mode & MODE_DIRECTORY && |
2709 | m->info.dir.first_dir_index > | |
2710 | first_dir_index && | |
2711 | m->info.dir.first_dir_index < | |
2712 | next_dir_index) | |
2713 | next_dir_index = | |
2714 | m->info.dir.first_dir_index; | |
de167e41 | 2715 | } |
a046433a FB |
2716 | remove_direntries(s, first_dir_index, |
2717 | next_dir_index - first_dir_index); | |
de167e41 | 2718 | |
a046433a | 2719 | deleted++; |
de167e41 | 2720 | } |
a046433a FB |
2721 | } else { |
2722 | if (unlink(mapping->path)) | |
2723 | return -4; | |
2724 | deleted++; | |
de167e41 | 2725 | } |
a046433a FB |
2726 | DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry)); |
2727 | remove_mapping(s, i); | |
de167e41 FB |
2728 | } |
2729 | } | |
2730 | } | |
a046433a FB |
2731 | |
2732 | return 0; | |
2733 | } | |
2734 | ||
2735 | /* | |
2736 | * synchronize mapping with new state: | |
2737 | * | |
2738 | * - copy FAT (with bdrv_read) | |
2739 | * - mark all filenames corresponding to mappings as deleted | |
2740 | * - recurse direntries from root (using bs->bdrv_read) | |
2741 | * - delete files corresponding to mappings marked as deleted | |
2742 | */ | |
2743 | static int do_commit(BDRVVVFATState* s) | |
2744 | { | |
2745 | int ret = 0; | |
2746 | ||
2747 | /* the real meat are the commits. Nothing to do? Move along! */ | |
2748 | if (s->commits.next == 0) | |
2749 | return 0; | |
2750 | ||
2751 | vvfat_close_current_file(s); | |
2752 | ||
2753 | ret = handle_renames_and_mkdirs(s); | |
2754 | if (ret) { | |
2755 | fprintf(stderr, "Error handling renames (%d)\n", ret); | |
43dc2a64 | 2756 | abort(); |
a046433a FB |
2757 | return ret; |
2758 | } | |
2759 | ||
5fafdf24 | 2760 | /* copy FAT (with bdrv_read) */ |
a046433a FB |
2761 | memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat); |
2762 | ||
2763 | /* recurse direntries from root (using bs->bdrv_read) */ | |
2764 | ret = commit_direntries(s, 0, -1); | |
2765 | if (ret) { | |
2766 | fprintf(stderr, "Fatal: error while committing (%d)\n", ret); | |
43dc2a64 | 2767 | abort(); |
a046433a FB |
2768 | return ret; |
2769 | } | |
2770 | ||
2771 | ret = handle_commits(s); | |
2772 | if (ret) { | |
2773 | fprintf(stderr, "Error handling commits (%d)\n", ret); | |
43dc2a64 | 2774 | abort(); |
a046433a FB |
2775 | return ret; |
2776 | } | |
2777 | ||
2778 | ret = handle_deletes(s); | |
2779 | if (ret) { | |
2780 | fprintf(stderr, "Error deleting\n"); | |
43dc2a64 | 2781 | abort(); |
a046433a FB |
2782 | return ret; |
2783 | } | |
2784 | ||
7704df98 KW |
2785 | if (s->qcow->drv->bdrv_make_empty) { |
2786 | s->qcow->drv->bdrv_make_empty(s->qcow); | |
2787 | } | |
a046433a FB |
2788 | |
2789 | memset(s->used_clusters, 0, sector2cluster(s, s->sector_count)); | |
2790 | ||
2791 | DLOG(checkpoint()); | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | static int try_commit(BDRVVVFATState* s) | |
2796 | { | |
2797 | vvfat_close_current_file(s); | |
2798 | DLOG(checkpoint()); | |
2799 | if(!is_consistent(s)) | |
2800 | return -1; | |
2801 | return do_commit(s); | |
2802 | } | |
2803 | ||
5fafdf24 | 2804 | static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
a046433a FB |
2805 | const uint8_t *buf, int nb_sectors) |
2806 | { | |
5fafdf24 | 2807 | BDRVVVFATState *s = bs->opaque; |
a046433a FB |
2808 | int i, ret; |
2809 | ||
2810 | DLOG(checkpoint()); | |
2811 | ||
ac48e389 KW |
2812 | /* Check if we're operating in read-only mode */ |
2813 | if (s->qcow == NULL) { | |
2814 | return -EACCES; | |
2815 | } | |
2816 | ||
a046433a FB |
2817 | vvfat_close_current_file(s); |
2818 | ||
2819 | /* | |
2820 | * Some sanity checks: | |
2821 | * - do not allow writing to the boot sector | |
2822 | * - do not allow to write non-ASCII filenames | |
2823 | */ | |
2824 | ||
2825 | if (sector_num < s->first_sectors_number) | |
2826 | return -1; | |
2827 | ||
2828 | for (i = sector2cluster(s, sector_num); | |
2829 | i <= sector2cluster(s, sector_num + nb_sectors - 1);) { | |
c227f099 | 2830 | mapping_t* mapping = find_mapping_for_cluster(s, i); |
a046433a FB |
2831 | if (mapping) { |
2832 | if (mapping->read_only) { | |
2833 | fprintf(stderr, "Tried to write to write-protected file %s\n", | |
2834 | mapping->path); | |
2835 | return -1; | |
2836 | } | |
2837 | ||
2838 | if (mapping->mode & MODE_DIRECTORY) { | |
2839 | int begin = cluster2sector(s, i); | |
2840 | int end = begin + s->sectors_per_cluster, k; | |
2841 | int dir_index; | |
c227f099 | 2842 | const direntry_t* direntries; |
a046433a FB |
2843 | long_file_name lfn; |
2844 | ||
2845 | lfn_init(&lfn); | |
2846 | ||
2847 | if (begin < sector_num) | |
2848 | begin = sector_num; | |
2849 | if (end > sector_num + nb_sectors) | |
2850 | end = sector_num + nb_sectors; | |
5fafdf24 | 2851 | dir_index = mapping->dir_index + |
a046433a | 2852 | 0x10 * (begin - mapping->begin * s->sectors_per_cluster); |
c227f099 | 2853 | direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num)); |
a046433a FB |
2854 | |
2855 | for (k = 0; k < (end - begin) * 0x10; k++) { | |
2856 | /* do not allow non-ASCII filenames */ | |
2857 | if (parse_long_name(&lfn, direntries + k) < 0) { | |
2858 | fprintf(stderr, "Warning: non-ASCII filename\n"); | |
2859 | return -1; | |
2860 | } | |
2861 | /* no access to the direntry of a read-only file */ | |
2862 | else if (is_short_name(direntries+k) && | |
2863 | (direntries[k].attributes & 1)) { | |
2864 | if (memcmp(direntries + k, | |
2865 | array_get(&(s->directory), dir_index + k), | |
c227f099 | 2866 | sizeof(direntry_t))) { |
a046433a FB |
2867 | fprintf(stderr, "Warning: tried to write to write-protected file\n"); |
2868 | return -1; | |
2869 | } | |
2870 | } | |
2871 | } | |
2872 | } | |
2873 | i = mapping->end; | |
2874 | } else | |
2875 | i++; | |
2876 | } | |
2877 | ||
2878 | /* | |
2879 | * Use qcow backend. Commit later. | |
2880 | */ | |
2881 | DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); | |
7704df98 | 2882 | ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
a046433a FB |
2883 | if (ret < 0) { |
2884 | fprintf(stderr, "Error writing to qcow backend\n"); | |
2885 | return ret; | |
2886 | } | |
2887 | ||
2888 | for (i = sector2cluster(s, sector_num); | |
2889 | i <= sector2cluster(s, sector_num + nb_sectors - 1); i++) | |
2890 | if (i >= 0) | |
2891 | s->used_clusters[i] |= USED_ALLOCATED; | |
2892 | ||
2893 | DLOG(checkpoint()); | |
2894 | /* TODO: add timeout */ | |
2895 | try_commit(s); | |
2896 | ||
2897 | DLOG(checkpoint()); | |
2898 | return 0; | |
2899 | } | |
2900 | ||
4575eb49 KW |
2901 | static int coroutine_fn |
2902 | vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
2903 | QEMUIOVector *qiov, int flags) | |
e183ef75 PB |
2904 | { |
2905 | int ret; | |
2906 | BDRVVVFATState *s = bs->opaque; | |
4575eb49 KW |
2907 | uint64_t sector_num = offset >> BDRV_SECTOR_BITS; |
2908 | int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
2909 | void *buf; | |
2910 | ||
2911 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); | |
2912 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
2913 | ||
2914 | buf = g_try_malloc(bytes); | |
2915 | if (bytes && buf == NULL) { | |
2916 | return -ENOMEM; | |
2917 | } | |
2918 | qemu_iovec_to_buf(qiov, 0, buf, bytes); | |
2919 | ||
e183ef75 PB |
2920 | qemu_co_mutex_lock(&s->lock); |
2921 | ret = vvfat_write(bs, sector_num, buf, nb_sectors); | |
2922 | qemu_co_mutex_unlock(&s->lock); | |
4575eb49 KW |
2923 | |
2924 | g_free(buf); | |
2925 | ||
e183ef75 PB |
2926 | return ret; |
2927 | } | |
2928 | ||
b6b8a333 | 2929 | static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 2930 | int64_t sector_num, int nb_sectors, int *n, BlockDriverState **file) |
a046433a FB |
2931 | { |
2932 | BDRVVVFATState* s = bs->opaque; | |
2933 | *n = s->sector_count - sector_num; | |
4bc74be9 PB |
2934 | if (*n > nb_sectors) { |
2935 | *n = nb_sectors; | |
2936 | } else if (*n < 0) { | |
2937 | return 0; | |
2938 | } | |
2939 | return BDRV_BLOCK_DATA; | |
a046433a FB |
2940 | } |
2941 | ||
4575eb49 KW |
2942 | static int coroutine_fn |
2943 | write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
2944 | QEMUIOVector *qiov, int flags) | |
2945 | { | |
9217e26f | 2946 | BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque); |
a046433a FB |
2947 | return try_commit(s); |
2948 | } | |
2949 | ||
2950 | static void write_target_close(BlockDriverState *bs) { | |
9217e26f | 2951 | BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque); |
4f6fd349 | 2952 | bdrv_unref(s->qcow); |
ce137829 | 2953 | g_free(s->qcow_filename); |
a046433a FB |
2954 | } |
2955 | ||
2956 | static BlockDriver vvfat_write_target = { | |
f9e96436 | 2957 | .format_name = "vvfat_write_target", |
4575eb49 | 2958 | .bdrv_co_pwritev = write_target_commit, |
f9e96436 | 2959 | .bdrv_close = write_target_close, |
a046433a FB |
2960 | }; |
2961 | ||
68c70af1 | 2962 | static int enable_write_target(BDRVVVFATState *s, Error **errp) |
a046433a | 2963 | { |
facdbb02 | 2964 | BlockDriver *bdrv_qcow = NULL; |
5db15a57 | 2965 | BlockDriverState *backing; |
facdbb02 | 2966 | QemuOpts *opts = NULL; |
a655211a | 2967 | int ret; |
a046433a | 2968 | int size = sector2cluster(s, s->sector_count); |
e6641719 HR |
2969 | QDict *options; |
2970 | ||
a046433a FB |
2971 | s->used_clusters = calloc(size, 1); |
2972 | ||
c227f099 | 2973 | array_init(&(s->commits), sizeof(commit_t)); |
a046433a | 2974 | |
9a29e18f JC |
2975 | s->qcow_filename = g_malloc(PATH_MAX); |
2976 | ret = get_tmp_filename(s->qcow_filename, PATH_MAX); | |
eba25057 | 2977 | if (ret < 0) { |
68c70af1 | 2978 | error_setg_errno(errp, -ret, "can't create temporary file"); |
78f27bd0 | 2979 | goto err; |
eba25057 | 2980 | } |
91a073a9 KW |
2981 | |
2982 | bdrv_qcow = bdrv_find_format("qcow"); | |
1bcb15cf HR |
2983 | if (!bdrv_qcow) { |
2984 | error_setg(errp, "Failed to locate qcow driver"); | |
2985 | ret = -ENOENT; | |
2986 | goto err; | |
2987 | } | |
2988 | ||
c282e1fd | 2989 | opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort); |
39101f25 MA |
2990 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512, |
2991 | &error_abort); | |
f43e47db | 2992 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort); |
91a073a9 | 2993 | |
c282e1fd | 2994 | ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp); |
facdbb02 | 2995 | qemu_opts_del(opts); |
78f27bd0 FZ |
2996 | if (ret < 0) { |
2997 | goto err; | |
2998 | } | |
a655211a | 2999 | |
f67503e5 | 3000 | s->qcow = NULL; |
e6641719 HR |
3001 | options = qdict_new(); |
3002 | qdict_put(options, "driver", qstring_from_str("qcow")); | |
3003 | ret = bdrv_open(&s->qcow, s->qcow_filename, NULL, options, | |
61de4c68 | 3004 | BDRV_O_RDWR | BDRV_O_NO_FLUSH, errp); |
a655211a | 3005 | if (ret < 0) { |
78f27bd0 | 3006 | goto err; |
d6e9098e | 3007 | } |
a046433a FB |
3008 | |
3009 | #ifndef _WIN32 | |
3010 | unlink(s->qcow_filename); | |
3011 | #endif | |
3012 | ||
5db15a57 KW |
3013 | backing = bdrv_new(); |
3014 | bdrv_set_backing_hd(s->bs, backing); | |
3015 | bdrv_unref(backing); | |
3016 | ||
760e0063 KW |
3017 | s->bs->backing->bs->drv = &vvfat_write_target; |
3018 | s->bs->backing->bs->opaque = g_new(void *, 1); | |
3019 | *(void**)s->bs->backing->bs->opaque = s; | |
a046433a | 3020 | |
de167e41 | 3021 | return 0; |
78f27bd0 FZ |
3022 | |
3023 | err: | |
3024 | g_free(s->qcow_filename); | |
3025 | s->qcow_filename = NULL; | |
3026 | return ret; | |
de167e41 FB |
3027 | } |
3028 | ||
3029 | static void vvfat_close(BlockDriverState *bs) | |
3030 | { | |
3031 | BDRVVVFATState *s = bs->opaque; | |
3032 | ||
3033 | vvfat_close_current_file(s); | |
3034 | array_free(&(s->fat)); | |
3035 | array_free(&(s->directory)); | |
3036 | array_free(&(s->mapping)); | |
ce137829 | 3037 | g_free(s->cluster_buffer); |
3397f0cb KW |
3038 | |
3039 | if (s->qcow) { | |
3040 | migrate_del_blocker(s->migration_blocker); | |
3041 | error_free(s->migration_blocker); | |
3042 | } | |
de167e41 FB |
3043 | } |
3044 | ||
5efa9d5a | 3045 | static BlockDriver bdrv_vvfat = { |
7ad9be64 KW |
3046 | .format_name = "vvfat", |
3047 | .protocol_name = "fat", | |
3048 | .instance_size = sizeof(BDRVVVFATState), | |
3049 | ||
3050 | .bdrv_parse_filename = vvfat_parse_filename, | |
3051 | .bdrv_file_open = vvfat_open, | |
3052 | .bdrv_close = vvfat_close, | |
7ad9be64 | 3053 | |
4575eb49 KW |
3054 | .bdrv_co_preadv = vvfat_co_preadv, |
3055 | .bdrv_co_pwritev = vvfat_co_pwritev, | |
b6b8a333 | 3056 | .bdrv_co_get_block_status = vvfat_co_get_block_status, |
de167e41 FB |
3057 | }; |
3058 | ||
5efa9d5a AL |
3059 | static void bdrv_vvfat_init(void) |
3060 | { | |
3061 | bdrv_register(&bdrv_vvfat); | |
3062 | } | |
3063 | ||
3064 | block_init(bdrv_vvfat_init); | |
3065 | ||
a046433a | 3066 | #ifdef DEBUG |
3f47aa8c | 3067 | static void checkpoint(void) { |
c227f099 | 3068 | assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
a046433a FB |
3069 | check1(vvv); |
3070 | check2(vvv); | |
3071 | assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); | |
3072 | #if 0 | |
c227f099 | 3073 | if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf) |
a046433a | 3074 | fprintf(stderr, "Nonono!\n"); |
c227f099 AL |
3075 | mapping_t* mapping; |
3076 | direntry_t* direntry; | |
a046433a FB |
3077 | assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next); |
3078 | assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next); | |
3079 | if (vvv->mapping.next<47) | |
3080 | return; | |
3081 | assert((mapping = array_get(&(vvv->mapping), 47))); | |
3082 | assert(mapping->dir_index < vvv->directory.next); | |
3083 | direntry = array_get(&(vvv->directory), mapping->dir_index); | |
3084 | assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0); | |
3085 | #endif | |
a046433a FB |
3086 | } |
3087 | #endif |