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1 | a046433a | bellard | /* vim:set shiftwidth=4 ts=8: */
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2 | de167e41 | bellard | /*
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3 | de167e41 | bellard | * QEMU Block driver for virtual VFAT (shadows a local directory)
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4 | 5fafdf24 | ths | *
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5 | a046433a | bellard | * Copyright (c) 2004,2005 Johannes E. Schindelin
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6 | 5fafdf24 | ths | *
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7 | de167e41 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | de167e41 | bellard | * of this software and associated documentation files (the "Software"), to deal
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9 | de167e41 | bellard | * in the Software without restriction, including without limitation the rights
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10 | de167e41 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | de167e41 | bellard | * copies of the Software, and to permit persons to whom the Software is
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12 | de167e41 | bellard | * furnished to do so, subject to the following conditions:
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13 | de167e41 | bellard | *
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14 | de167e41 | bellard | * The above copyright notice and this permission notice shall be included in
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15 | de167e41 | bellard | * all copies or substantial portions of the Software.
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16 | de167e41 | bellard | *
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17 | de167e41 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | de167e41 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | de167e41 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | de167e41 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | de167e41 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | de167e41 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | de167e41 | bellard | * THE SOFTWARE.
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24 | de167e41 | bellard | */
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25 | de167e41 | bellard | #include <sys/stat.h> |
26 | de167e41 | bellard | #include <dirent.h> |
27 | faf07963 | pbrook | #include "qemu-common.h" |
28 | de167e41 | bellard | #include "block_int.h" |
29 | 5efa9d5a | Anthony Liguori | #include "module.h" |
30 | de167e41 | bellard | |
31 | a046433a | bellard | #ifndef S_IWGRP
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32 | a046433a | bellard | #define S_IWGRP 0 |
33 | a046433a | bellard | #endif
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34 | a046433a | bellard | #ifndef S_IWOTH
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35 | a046433a | bellard | #define S_IWOTH 0 |
36 | a046433a | bellard | #endif
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37 | a046433a | bellard | |
38 | a046433a | bellard | /* TODO: add ":bootsector=blabla.img:" */
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39 | a046433a | bellard | /* LATER TODO: add automatic boot sector generation from
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40 | a046433a | bellard | BOOTEASY.ASM and Ranish Partition Manager
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41 | 5fafdf24 | ths | Note that DOS assumes the system files to be the first files in the
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42 | a046433a | bellard | file system (test if the boot sector still relies on that fact)! */
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43 | a046433a | bellard | /* MAYBE TODO: write block-visofs.c */
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44 | a046433a | bellard | /* TODO: call try_commit() only after a timeout */
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45 | a046433a | bellard | |
46 | a046433a | bellard | /* #define DEBUG */
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47 | a046433a | bellard | |
48 | a046433a | bellard | #ifdef DEBUG
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49 | a046433a | bellard | |
50 | a046433a | bellard | #define DLOG(a) a
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51 | a046433a | bellard | |
52 | a046433a | bellard | #undef stderr
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53 | a046433a | bellard | #define stderr STDERR
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54 | a046433a | bellard | FILE* stderr = NULL;
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55 | de167e41 | bellard | |
56 | 3f47aa8c | blueswir1 | static void checkpoint(void); |
57 | de167e41 | bellard | |
58 | a046433a | bellard | #ifdef __MINGW32__
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59 | a046433a | bellard | void nonono(const char* file, int line, const char* msg) { |
60 | a046433a | bellard | fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg);
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61 | a046433a | bellard | exit(-5);
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62 | a046433a | bellard | } |
63 | a046433a | bellard | #undef assert
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64 | 6bcb76c3 | bellard | #define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0) |
65 | a046433a | bellard | #endif
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66 | a046433a | bellard | |
67 | a046433a | bellard | #else
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68 | a046433a | bellard | |
69 | a046433a | bellard | #define DLOG(a)
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70 | a046433a | bellard | |
71 | a046433a | bellard | #endif
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72 | de167e41 | bellard | |
73 | de167e41 | bellard | /* dynamic array functions */
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74 | c227f099 | Anthony Liguori | typedef struct array_t { |
75 | de167e41 | bellard | char* pointer;
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76 | de167e41 | bellard | unsigned int size,next,item_size; |
77 | c227f099 | Anthony Liguori | } array_t; |
78 | de167e41 | bellard | |
79 | c227f099 | Anthony Liguori | static inline void array_init(array_t* array,unsigned int item_size) |
80 | de167e41 | bellard | { |
81 | 511d2b14 | blueswir1 | array->pointer = NULL;
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82 | de167e41 | bellard | array->size=0;
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83 | de167e41 | bellard | array->next=0;
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84 | de167e41 | bellard | array->item_size=item_size; |
85 | de167e41 | bellard | } |
86 | de167e41 | bellard | |
87 | c227f099 | Anthony Liguori | static inline void array_free(array_t* array) |
88 | de167e41 | bellard | { |
89 | de167e41 | bellard | if(array->pointer)
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90 | de167e41 | bellard | free(array->pointer); |
91 | de167e41 | bellard | array->size=array->next=0;
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92 | de167e41 | bellard | } |
93 | de167e41 | bellard | |
94 | a046433a | bellard | /* does not automatically grow */
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95 | c227f099 | Anthony Liguori | static inline void* array_get(array_t* array,unsigned int index) { |
96 | a046433a | bellard | assert(index < array->next); |
97 | a046433a | bellard | return array->pointer + index * array->item_size;
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98 | a046433a | bellard | } |
99 | a046433a | bellard | |
100 | c227f099 | Anthony Liguori | static inline int array_ensure_allocated(array_t* array, int index) |
101 | a046433a | bellard | { |
102 | a046433a | bellard | if((index + 1) * array->item_size > array->size) { |
103 | a046433a | bellard | int new_size = (index + 32) * array->item_size; |
104 | 2137b4cc | ths | array->pointer = qemu_realloc(array->pointer, new_size); |
105 | a046433a | bellard | if (!array->pointer)
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106 | a046433a | bellard | return -1; |
107 | a046433a | bellard | array->size = new_size; |
108 | a046433a | bellard | array->next = index + 1;
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109 | de167e41 | bellard | } |
110 | a046433a | bellard | |
111 | a046433a | bellard | return 0; |
112 | de167e41 | bellard | } |
113 | de167e41 | bellard | |
114 | c227f099 | Anthony Liguori | static inline void* array_get_next(array_t* array) { |
115 | a046433a | bellard | unsigned int next = array->next; |
116 | a046433a | bellard | void* result;
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117 | a046433a | bellard | |
118 | a046433a | bellard | if (array_ensure_allocated(array, next) < 0) |
119 | a046433a | bellard | return NULL; |
120 | a046433a | bellard | |
121 | a046433a | bellard | array->next = next + 1;
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122 | a046433a | bellard | result = array_get(array, next); |
123 | a046433a | bellard | |
124 | de167e41 | bellard | return result;
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125 | de167e41 | bellard | } |
126 | de167e41 | bellard | |
127 | c227f099 | Anthony Liguori | static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) { |
128 | de167e41 | bellard | if((array->next+count)*array->item_size>array->size) {
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129 | de167e41 | bellard | int increment=count*array->item_size;
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130 | 2137b4cc | ths | array->pointer=qemu_realloc(array->pointer,array->size+increment); |
131 | de167e41 | bellard | if(!array->pointer)
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132 | 511d2b14 | blueswir1 | return NULL; |
133 | de167e41 | bellard | array->size+=increment; |
134 | de167e41 | bellard | } |
135 | de167e41 | bellard | memmove(array->pointer+(index+count)*array->item_size, |
136 | de167e41 | bellard | array->pointer+index*array->item_size, |
137 | de167e41 | bellard | (array->next-index)*array->item_size); |
138 | de167e41 | bellard | array->next+=count; |
139 | de167e41 | bellard | return array->pointer+index*array->item_size;
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140 | de167e41 | bellard | } |
141 | de167e41 | bellard | |
142 | de167e41 | bellard | /* this performs a "roll", so that the element which was at index_from becomes
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143 | de167e41 | bellard | * index_to, but the order of all other elements is preserved. */
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144 | c227f099 | Anthony Liguori | static inline int array_roll(array_t* array,int index_to,int index_from,int count) |
145 | de167e41 | bellard | { |
146 | de167e41 | bellard | char* buf;
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147 | de167e41 | bellard | char* from;
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148 | de167e41 | bellard | char* to;
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149 | de167e41 | bellard | int is;
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150 | de167e41 | bellard | |
151 | de167e41 | bellard | if(!array ||
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152 | de167e41 | bellard | index_to<0 || index_to>=array->next ||
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153 | de167e41 | bellard | index_from<0 || index_from>=array->next)
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154 | de167e41 | bellard | return -1; |
155 | 3b46e624 | ths | |
156 | de167e41 | bellard | if(index_to==index_from)
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157 | de167e41 | bellard | return 0; |
158 | de167e41 | bellard | |
159 | de167e41 | bellard | is=array->item_size; |
160 | de167e41 | bellard | from=array->pointer+index_from*is; |
161 | de167e41 | bellard | to=array->pointer+index_to*is; |
162 | 3ec88e80 | aliguori | buf=qemu_malloc(is*count); |
163 | de167e41 | bellard | memcpy(buf,from,is*count); |
164 | de167e41 | bellard | |
165 | de167e41 | bellard | if(index_to<index_from)
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166 | de167e41 | bellard | memmove(to+is*count,to,from-to); |
167 | de167e41 | bellard | else
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168 | de167e41 | bellard | memmove(from,from+is*count,to-from); |
169 | 3b46e624 | ths | |
170 | de167e41 | bellard | memcpy(to,buf,is*count); |
171 | de167e41 | bellard | |
172 | de167e41 | bellard | free(buf); |
173 | de167e41 | bellard | |
174 | de167e41 | bellard | return 0; |
175 | de167e41 | bellard | } |
176 | de167e41 | bellard | |
177 | c227f099 | Anthony Liguori | static inline int array_remove_slice(array_t* array,int index, int count) |
178 | de167e41 | bellard | { |
179 | a046433a | bellard | assert(index >=0);
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180 | a046433a | bellard | assert(count > 0);
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181 | a046433a | bellard | assert(index + count <= array->next); |
182 | a046433a | bellard | if(array_roll(array,array->next-1,index,count)) |
183 | de167e41 | bellard | return -1; |
184 | a046433a | bellard | array->next -= count; |
185 | de167e41 | bellard | return 0; |
186 | de167e41 | bellard | } |
187 | de167e41 | bellard | |
188 | c227f099 | Anthony Liguori | static int array_remove(array_t* array,int index) |
189 | a046433a | bellard | { |
190 | a046433a | bellard | return array_remove_slice(array, index, 1); |
191 | a046433a | bellard | } |
192 | a046433a | bellard | |
193 | a046433a | bellard | /* return the index for a given member */
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194 | c227f099 | Anthony Liguori | static int array_index(array_t* array, void* pointer) |
195 | a046433a | bellard | { |
196 | a046433a | bellard | size_t offset = (char*)pointer - array->pointer;
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197 | a046433a | bellard | assert((offset % array->item_size) == 0);
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198 | a046433a | bellard | assert(offset/array->item_size < array->next); |
199 | a046433a | bellard | return offset/array->item_size;
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200 | a046433a | bellard | } |
201 | a046433a | bellard | |
202 | de167e41 | bellard | /* These structures are used to fake a disk and the VFAT filesystem.
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203 | de167e41 | bellard | * For this reason we need to use __attribute__((packed)). */
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204 | de167e41 | bellard | |
205 | c227f099 | Anthony Liguori | typedef struct bootsector_t { |
206 | de167e41 | bellard | uint8_t jump[3];
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207 | de167e41 | bellard | uint8_t name[8];
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208 | de167e41 | bellard | uint16_t sector_size; |
209 | de167e41 | bellard | uint8_t sectors_per_cluster; |
210 | de167e41 | bellard | uint16_t reserved_sectors; |
211 | de167e41 | bellard | uint8_t number_of_fats; |
212 | de167e41 | bellard | uint16_t root_entries; |
213 | a046433a | bellard | uint16_t total_sectors16; |
214 | de167e41 | bellard | uint8_t media_type; |
215 | de167e41 | bellard | uint16_t sectors_per_fat; |
216 | de167e41 | bellard | uint16_t sectors_per_track; |
217 | de167e41 | bellard | uint16_t number_of_heads; |
218 | de167e41 | bellard | uint32_t hidden_sectors; |
219 | de167e41 | bellard | uint32_t total_sectors; |
220 | de167e41 | bellard | union {
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221 | de167e41 | bellard | struct {
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222 | de167e41 | bellard | uint8_t drive_number; |
223 | de167e41 | bellard | uint8_t current_head; |
224 | de167e41 | bellard | uint8_t signature; |
225 | de167e41 | bellard | uint32_t id; |
226 | de167e41 | bellard | uint8_t volume_label[11];
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227 | de167e41 | bellard | } __attribute__((packed)) fat16; |
228 | de167e41 | bellard | struct {
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229 | de167e41 | bellard | uint32_t sectors_per_fat; |
230 | de167e41 | bellard | uint16_t flags; |
231 | de167e41 | bellard | uint8_t major,minor; |
232 | de167e41 | bellard | uint32_t first_cluster_of_root_directory; |
233 | de167e41 | bellard | uint16_t info_sector; |
234 | de167e41 | bellard | uint16_t backup_boot_sector; |
235 | de167e41 | bellard | uint16_t ignored; |
236 | de167e41 | bellard | } __attribute__((packed)) fat32; |
237 | de167e41 | bellard | } u; |
238 | de167e41 | bellard | uint8_t fat_type[8];
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239 | de167e41 | bellard | uint8_t ignored[0x1c0];
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240 | de167e41 | bellard | uint8_t magic[2];
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241 | c227f099 | Anthony Liguori | } __attribute__((packed)) bootsector_t; |
242 | de167e41 | bellard | |
243 | b570094d | ths | typedef struct { |
244 | b570094d | ths | uint8_t head; |
245 | b570094d | ths | uint8_t sector; |
246 | b570094d | ths | uint8_t cylinder; |
247 | c227f099 | Anthony Liguori | } mbr_chs_t; |
248 | b570094d | ths | |
249 | c227f099 | Anthony Liguori | typedef struct partition_t { |
250 | de167e41 | bellard | uint8_t attributes; /* 0x80 = bootable */
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251 | c227f099 | Anthony Liguori | mbr_chs_t start_CHS; |
252 | b570094d | ths | uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
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253 | c227f099 | Anthony Liguori | mbr_chs_t end_CHS; |
254 | de167e41 | bellard | uint32_t start_sector_long; |
255 | b570094d | ths | uint32_t length_sector_long; |
256 | c227f099 | Anthony Liguori | } __attribute__((packed)) partition_t; |
257 | de167e41 | bellard | |
258 | c227f099 | Anthony Liguori | typedef struct mbr_t { |
259 | b570094d | ths | uint8_t ignored[0x1b8];
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260 | b570094d | ths | uint32_t nt_id; |
261 | b570094d | ths | uint8_t ignored2[2];
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262 | c227f099 | Anthony Liguori | partition_t partition[4];
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263 | de167e41 | bellard | uint8_t magic[2];
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264 | c227f099 | Anthony Liguori | } __attribute__((packed)) mbr_t; |
265 | de167e41 | bellard | |
266 | c227f099 | Anthony Liguori | typedef struct direntry_t { |
267 | de167e41 | bellard | uint8_t name[8];
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268 | de167e41 | bellard | uint8_t extension[3];
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269 | de167e41 | bellard | uint8_t attributes; |
270 | de167e41 | bellard | uint8_t reserved[2];
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271 | de167e41 | bellard | uint16_t ctime; |
272 | de167e41 | bellard | uint16_t cdate; |
273 | de167e41 | bellard | uint16_t adate; |
274 | de167e41 | bellard | uint16_t begin_hi; |
275 | de167e41 | bellard | uint16_t mtime; |
276 | de167e41 | bellard | uint16_t mdate; |
277 | de167e41 | bellard | uint16_t begin; |
278 | de167e41 | bellard | uint32_t size; |
279 | c227f099 | Anthony Liguori | } __attribute__((packed)) direntry_t; |
280 | de167e41 | bellard | |
281 | de167e41 | bellard | /* this structure are used to transparently access the files */
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282 | de167e41 | bellard | |
283 | c227f099 | Anthony Liguori | typedef struct mapping_t { |
284 | a046433a | bellard | /* begin is the first cluster, end is the last+1 */
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285 | a046433a | bellard | uint32_t begin,end; |
286 | de167e41 | bellard | /* as s->directory is growable, no pointer may be used here */
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287 | de167e41 | bellard | unsigned int dir_index; |
288 | a046433a | bellard | /* the clusters of a file may be in any order; this points to the first */
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289 | a046433a | bellard | int first_mapping_index;
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290 | a046433a | bellard | union {
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291 | a046433a | bellard | /* offset is
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292 | a046433a | bellard | * - the offset in the file (in clusters) for a file, or
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293 | a046433a | bellard | * - the next cluster of the directory for a directory, and
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294 | a046433a | bellard | * - the address of the buffer for a faked entry
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295 | a046433a | bellard | */
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296 | a046433a | bellard | struct {
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297 | a046433a | bellard | uint32_t offset; |
298 | a046433a | bellard | } file; |
299 | a046433a | bellard | struct {
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300 | a046433a | bellard | int parent_mapping_index;
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301 | a046433a | bellard | int first_dir_index;
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302 | a046433a | bellard | } dir; |
303 | a046433a | bellard | } info; |
304 | a046433a | bellard | /* path contains the full path, i.e. it always starts with s->path */
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305 | a046433a | bellard | char* path;
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306 | a046433a | bellard | |
307 | a046433a | bellard | enum { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2, |
308 | a046433a | bellard | MODE_DIRECTORY = 4, MODE_FAKED = 8, |
309 | a046433a | bellard | MODE_DELETED = 16, MODE_RENAMED = 32 } mode; |
310 | a046433a | bellard | int read_only;
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311 | c227f099 | Anthony Liguori | } mapping_t; |
312 | de167e41 | bellard | |
313 | a046433a | bellard | #ifdef DEBUG
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314 | c227f099 | Anthony Liguori | static void print_direntry(const struct direntry_t*); |
315 | c227f099 | Anthony Liguori | static void print_mapping(const struct mapping_t* mapping); |
316 | a046433a | bellard | #endif
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317 | de167e41 | bellard | |
318 | de167e41 | bellard | /* here begins the real VVFAT driver */
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319 | de167e41 | bellard | |
320 | de167e41 | bellard | typedef struct BDRVVVFATState { |
321 | a046433a | bellard | BlockDriverState* bs; /* pointer to parent */
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322 | de167e41 | bellard | unsigned int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */ |
323 | de167e41 | bellard | unsigned char first_sectors[0x40*0x200]; |
324 | 3b46e624 | ths | |
325 | de167e41 | bellard | int fat_type; /* 16 or 32 */ |
326 | c227f099 | Anthony Liguori | array_t fat,directory,mapping; |
327 | 3b46e624 | ths | |
328 | de167e41 | bellard | unsigned int cluster_size; |
329 | de167e41 | bellard | unsigned int sectors_per_cluster; |
330 | de167e41 | bellard | unsigned int sectors_per_fat; |
331 | de167e41 | bellard | unsigned int sectors_of_root_directory; |
332 | a046433a | bellard | uint32_t last_cluster_of_root_directory; |
333 | de167e41 | bellard | unsigned int faked_sectors; /* how many sectors are faked before file data */ |
334 | de167e41 | bellard | uint32_t sector_count; /* total number of sectors of the partition */
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335 | de167e41 | bellard | uint32_t cluster_count; /* total number of clusters of this partition */
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336 | de167e41 | bellard | uint32_t max_fat_value; |
337 | 3b46e624 | ths | |
338 | de167e41 | bellard | int current_fd;
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339 | c227f099 | Anthony Liguori | mapping_t* current_mapping; |
340 | a046433a | bellard | unsigned char* cluster; /* points to current cluster */ |
341 | a046433a | bellard | unsigned char* cluster_buffer; /* points to a buffer to hold temp data */ |
342 | de167e41 | bellard | unsigned int current_cluster; |
343 | de167e41 | bellard | |
344 | de167e41 | bellard | /* write support */
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345 | a046433a | bellard | BlockDriverState* write_target; |
346 | a046433a | bellard | char* qcow_filename;
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347 | a046433a | bellard | BlockDriverState* qcow; |
348 | a046433a | bellard | void* fat2;
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349 | a046433a | bellard | char* used_clusters;
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350 | c227f099 | Anthony Liguori | array_t commits; |
351 | a046433a | bellard | const char* path; |
352 | a046433a | bellard | int downcase_short_names;
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353 | de167e41 | bellard | } BDRVVVFATState; |
354 | de167e41 | bellard | |
355 | b570094d | ths | /* take the sector position spos and convert it to Cylinder/Head/Sector position
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356 | b570094d | ths | * if the position is outside the specified geometry, fill maximum value for CHS
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357 | b570094d | ths | * and return 1 to signal overflow.
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358 | b570094d | ths | */
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359 | c227f099 | Anthony Liguori | static int sector2CHS(BlockDriverState* bs, mbr_chs_t * chs, int spos){ |
360 | b570094d | ths | int head,sector;
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361 | b570094d | ths | sector = spos % (bs->secs); spos/= bs->secs; |
362 | b570094d | ths | head = spos % (bs->heads); spos/= bs->heads; |
363 | b570094d | ths | if(spos >= bs->cyls){
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364 | b570094d | ths | /* Overflow,
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365 | b570094d | ths | it happens if 32bit sector positions are used, while CHS is only 24bit.
|
366 | b570094d | ths | Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */
|
367 | b570094d | ths | chs->head = 0xFF;
|
368 | b570094d | ths | chs->sector = 0xFF;
|
369 | b570094d | ths | chs->cylinder = 0xFF;
|
370 | b570094d | ths | return 1; |
371 | b570094d | ths | } |
372 | b570094d | ths | chs->head = (uint8_t)head; |
373 | b570094d | ths | chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) ); |
374 | b570094d | ths | chs->cylinder = (uint8_t)spos; |
375 | b570094d | ths | return 0; |
376 | b570094d | ths | } |
377 | de167e41 | bellard | |
378 | de167e41 | bellard | static void init_mbr(BDRVVVFATState* s) |
379 | de167e41 | bellard | { |
380 | de167e41 | bellard | /* TODO: if the files mbr.img and bootsect.img exist, use them */
|
381 | c227f099 | Anthony Liguori | mbr_t* real_mbr=(mbr_t*)s->first_sectors; |
382 | c227f099 | Anthony Liguori | partition_t* partition = &(real_mbr->partition[0]);
|
383 | b570094d | ths | int lba;
|
384 | de167e41 | bellard | |
385 | de167e41 | bellard | memset(s->first_sectors,0,512); |
386 | 3b46e624 | ths | |
387 | b570094d | ths | /* Win NT Disk Signature */
|
388 | b570094d | ths | real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
|
389 | b570094d | ths | |
390 | de167e41 | bellard | partition->attributes=0x80; /* bootable */ |
391 | b570094d | ths | |
392 | b570094d | ths | /* LBA is used when partition is outside the CHS geometry */
|
393 | b570094d | ths | lba = sector2CHS(s->bs, &partition->start_CHS, s->first_sectors_number-1);
|
394 | b570094d | ths | lba|= sector2CHS(s->bs, &partition->end_CHS, s->sector_count); |
395 | b570094d | ths | |
396 | b570094d | ths | /*LBA partitions are identified only by start/length_sector_long not by CHS*/
|
397 | b570094d | ths | partition->start_sector_long =cpu_to_le32(s->first_sectors_number-1);
|
398 | b570094d | ths | partition->length_sector_long=cpu_to_le32(s->sector_count - s->first_sectors_number+1);
|
399 | b570094d | ths | |
400 | a046433a | bellard | /* FAT12/FAT16/FAT32 */
|
401 | b570094d | ths | /* DOS uses different types when partition is LBA,
|
402 | b570094d | ths | probably to prevent older versions from using CHS on them */
|
403 | b570094d | ths | partition->fs_type= s->fat_type==12 ? 0x1: |
404 | b570094d | ths | s->fat_type==16 ? (lba?0xe:0x06): |
405 | b570094d | ths | /*fat_tyoe==32*/ (lba?0xc:0x0b); |
406 | de167e41 | bellard | |
407 | de167e41 | bellard | real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; |
408 | de167e41 | bellard | } |
409 | de167e41 | bellard | |
410 | a046433a | bellard | /* direntry functions */
|
411 | a046433a | bellard | |
412 | de167e41 | bellard | /* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
|
413 | 60fe76f3 | ths | static inline int short2long_name(char* dest,const char* src) |
414 | de167e41 | bellard | { |
415 | de167e41 | bellard | int i;
|
416 | 1e080d5d | balrog | int len;
|
417 | de167e41 | bellard | for(i=0;i<129 && src[i];i++) { |
418 | de167e41 | bellard | dest[2*i]=src[i];
|
419 | de167e41 | bellard | dest[2*i+1]=0; |
420 | de167e41 | bellard | } |
421 | 1e080d5d | balrog | len=2*i;
|
422 | de167e41 | bellard | dest[2*i]=dest[2*i+1]=0; |
423 | de167e41 | bellard | for(i=2*i+2;(i%26);i++) |
424 | de167e41 | bellard | dest[i]=0xff;
|
425 | 1e080d5d | balrog | return len;
|
426 | de167e41 | bellard | } |
427 | de167e41 | bellard | |
428 | c227f099 | Anthony Liguori | static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
429 | de167e41 | bellard | { |
430 | de167e41 | bellard | char buffer[258]; |
431 | de167e41 | bellard | int length=short2long_name(buffer,filename),
|
432 | de167e41 | bellard | number_of_entries=(length+25)/26,i; |
433 | c227f099 | Anthony Liguori | direntry_t* entry; |
434 | de167e41 | bellard | |
435 | de167e41 | bellard | for(i=0;i<number_of_entries;i++) { |
436 | de167e41 | bellard | entry=array_get_next(&(s->directory)); |
437 | de167e41 | bellard | entry->attributes=0xf;
|
438 | de167e41 | bellard | entry->reserved[0]=0; |
439 | de167e41 | bellard | entry->begin=0;
|
440 | de167e41 | bellard | entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); |
441 | de167e41 | bellard | } |
442 | 1e080d5d | balrog | for(i=0;i<26*number_of_entries;i++) { |
443 | de167e41 | bellard | int offset=(i%26); |
444 | de167e41 | bellard | if(offset<10) offset=1+offset; |
445 | de167e41 | bellard | else if(offset<22) offset=14+offset-10; |
446 | de167e41 | bellard | else offset=28+offset-22; |
447 | de167e41 | bellard | entry=array_get(&(s->directory),s->directory.next-1-(i/26)); |
448 | de167e41 | bellard | entry->name[offset]=buffer[i]; |
449 | de167e41 | bellard | } |
450 | de167e41 | bellard | return array_get(&(s->directory),s->directory.next-number_of_entries);
|
451 | de167e41 | bellard | } |
452 | de167e41 | bellard | |
453 | c227f099 | Anthony Liguori | static char is_free(const direntry_t* direntry) |
454 | a046433a | bellard | { |
455 | ad1a897e | ths | return direntry->name[0]==0xe5 || direntry->name[0]==0x00; |
456 | a046433a | bellard | } |
457 | a046433a | bellard | |
458 | c227f099 | Anthony Liguori | static char is_volume_label(const direntry_t* direntry) |
459 | a046433a | bellard | { |
460 | a046433a | bellard | return direntry->attributes == 0x28; |
461 | a046433a | bellard | } |
462 | a046433a | bellard | |
463 | c227f099 | Anthony Liguori | static char is_long_name(const direntry_t* direntry) |
464 | a046433a | bellard | { |
465 | a046433a | bellard | return direntry->attributes == 0xf; |
466 | a046433a | bellard | } |
467 | a046433a | bellard | |
468 | c227f099 | Anthony Liguori | static char is_short_name(const direntry_t* direntry) |
469 | a046433a | bellard | { |
470 | a046433a | bellard | return !is_volume_label(direntry) && !is_long_name(direntry)
|
471 | a046433a | bellard | && !is_free(direntry); |
472 | a046433a | bellard | } |
473 | a046433a | bellard | |
474 | c227f099 | Anthony Liguori | static char is_directory(const direntry_t* direntry) |
475 | a046433a | bellard | { |
476 | a046433a | bellard | return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; |
477 | a046433a | bellard | } |
478 | a046433a | bellard | |
479 | c227f099 | Anthony Liguori | static inline char is_dot(const direntry_t* direntry) |
480 | a046433a | bellard | { |
481 | a046433a | bellard | return is_short_name(direntry) && direntry->name[0] == '.'; |
482 | a046433a | bellard | } |
483 | a046433a | bellard | |
484 | c227f099 | Anthony Liguori | static char is_file(const direntry_t* direntry) |
485 | a046433a | bellard | { |
486 | a046433a | bellard | return is_short_name(direntry) && !is_directory(direntry);
|
487 | a046433a | bellard | } |
488 | a046433a | bellard | |
489 | c227f099 | Anthony Liguori | static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
490 | a046433a | bellard | { |
491 | a046433a | bellard | return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); |
492 | a046433a | bellard | } |
493 | a046433a | bellard | |
494 | c227f099 | Anthony Liguori | static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
495 | a046433a | bellard | { |
496 | a046433a | bellard | return le32_to_cpu(direntry->size);
|
497 | a046433a | bellard | } |
498 | a046433a | bellard | |
499 | c227f099 | Anthony Liguori | static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
500 | a046433a | bellard | { |
501 | a046433a | bellard | direntry->begin = cpu_to_le16(begin & 0xffff);
|
502 | a046433a | bellard | direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); |
503 | a046433a | bellard | } |
504 | a046433a | bellard | |
505 | de167e41 | bellard | /* fat functions */
|
506 | de167e41 | bellard | |
507 | c227f099 | Anthony Liguori | static inline uint8_t fat_chksum(const direntry_t* entry) |
508 | de167e41 | bellard | { |
509 | de167e41 | bellard | uint8_t chksum=0;
|
510 | de167e41 | bellard | int i;
|
511 | de167e41 | bellard | |
512 | 5606c220 | Aurelien Jarno | for(i=0;i<11;i++) { |
513 | 5606c220 | Aurelien Jarno | unsigned char c; |
514 | 5606c220 | Aurelien Jarno | |
515 | 5606c220 | Aurelien Jarno | c = (i <= 8) ? entry->name[i] : entry->extension[i-8]; |
516 | 5606c220 | Aurelien Jarno | chksum=(((chksum&0xfe)>>1)|((chksum&0x01)?0x80:0)) + c; |
517 | 5606c220 | Aurelien Jarno | } |
518 | 3b46e624 | ths | |
519 | de167e41 | bellard | return chksum;
|
520 | de167e41 | bellard | } |
521 | de167e41 | bellard | |
522 | de167e41 | bellard | /* if return_time==0, this returns the fat_date, else the fat_time */
|
523 | de167e41 | bellard | static uint16_t fat_datetime(time_t time,int return_time) { |
524 | de167e41 | bellard | struct tm* t;
|
525 | de167e41 | bellard | #ifdef _WIN32
|
526 | de167e41 | bellard | t=localtime(&time); /* this is not thread safe */
|
527 | de167e41 | bellard | #else
|
528 | de167e41 | bellard | struct tm t1;
|
529 | 6ab00cee | Michael S. Tsirkin | t = &t1; |
530 | de167e41 | bellard | localtime_r(&time,t); |
531 | de167e41 | bellard | #endif
|
532 | de167e41 | bellard | if(return_time)
|
533 | de167e41 | bellard | return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); |
534 | de167e41 | bellard | return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); |
535 | de167e41 | bellard | } |
536 | de167e41 | bellard | |
537 | de167e41 | bellard | static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) |
538 | de167e41 | bellard | { |
539 | a046433a | bellard | if(s->fat_type==32) { |
540 | a046433a | bellard | uint32_t* entry=array_get(&(s->fat),cluster); |
541 | a046433a | bellard | *entry=cpu_to_le32(value); |
542 | de167e41 | bellard | } else if(s->fat_type==16) { |
543 | de167e41 | bellard | uint16_t* entry=array_get(&(s->fat),cluster); |
544 | de167e41 | bellard | *entry=cpu_to_le16(value&0xffff);
|
545 | de167e41 | bellard | } else {
|
546 | a046433a | bellard | int offset = (cluster*3/2); |
547 | a046433a | bellard | unsigned char* p = array_get(&(s->fat), offset); |
548 | a046433a | bellard | switch (cluster&1) { |
549 | a046433a | bellard | case 0: |
550 | a046433a | bellard | p[0] = value&0xff; |
551 | a046433a | bellard | p[1] = (p[1]&0xf0) | ((value>>8)&0xf); |
552 | a046433a | bellard | break;
|
553 | a046433a | bellard | case 1: |
554 | a046433a | bellard | p[0] = (p[0]&0xf) | ((value&0xf)<<4); |
555 | a046433a | bellard | p[1] = (value>>4); |
556 | a046433a | bellard | break;
|
557 | a046433a | bellard | } |
558 | de167e41 | bellard | } |
559 | de167e41 | bellard | } |
560 | de167e41 | bellard | |
561 | de167e41 | bellard | static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) |
562 | de167e41 | bellard | { |
563 | a046433a | bellard | if(s->fat_type==32) { |
564 | a046433a | bellard | uint32_t* entry=array_get(&(s->fat),cluster); |
565 | a046433a | bellard | return le32_to_cpu(*entry);
|
566 | de167e41 | bellard | } else if(s->fat_type==16) { |
567 | de167e41 | bellard | uint16_t* entry=array_get(&(s->fat),cluster); |
568 | de167e41 | bellard | return le16_to_cpu(*entry);
|
569 | de167e41 | bellard | } else {
|
570 | ffe8ab83 | ths | const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2; |
571 | a046433a | bellard | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
572 | de167e41 | bellard | } |
573 | de167e41 | bellard | } |
574 | de167e41 | bellard | |
575 | de167e41 | bellard | static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) |
576 | de167e41 | bellard | { |
577 | de167e41 | bellard | if(fat_entry>s->max_fat_value-8) |
578 | de167e41 | bellard | return -1; |
579 | de167e41 | bellard | return 0; |
580 | de167e41 | bellard | } |
581 | de167e41 | bellard | |
582 | de167e41 | bellard | static inline void init_fat(BDRVVVFATState* s) |
583 | de167e41 | bellard | { |
584 | a046433a | bellard | if (s->fat_type == 12) { |
585 | a046433a | bellard | array_init(&(s->fat),1);
|
586 | a046433a | bellard | array_ensure_allocated(&(s->fat), |
587 | a046433a | bellard | s->sectors_per_fat * 0x200 * 3 / 2 - 1); |
588 | a046433a | bellard | } else {
|
589 | a046433a | bellard | array_init(&(s->fat),(s->fat_type==32?4:2)); |
590 | a046433a | bellard | array_ensure_allocated(&(s->fat), |
591 | a046433a | bellard | s->sectors_per_fat * 0x200 / s->fat.item_size - 1); |
592 | a046433a | bellard | } |
593 | de167e41 | bellard | memset(s->fat.pointer,0,s->fat.size);
|
594 | 3b46e624 | ths | |
595 | de167e41 | bellard | switch(s->fat_type) {
|
596 | de167e41 | bellard | case 12: s->max_fat_value=0xfff; break; |
597 | de167e41 | bellard | case 16: s->max_fat_value=0xffff; break; |
598 | a046433a | bellard | case 32: s->max_fat_value=0x0fffffff; break; |
599 | de167e41 | bellard | default: s->max_fat_value=0; /* error... */ |
600 | de167e41 | bellard | } |
601 | de167e41 | bellard | |
602 | de167e41 | bellard | } |
603 | de167e41 | bellard | |
604 | a046433a | bellard | /* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
|
605 | a046433a | bellard | /* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
|
606 | c227f099 | Anthony Liguori | static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
607 | a046433a | bellard | unsigned int directory_start, const char* filename, int is_dot) |
608 | de167e41 | bellard | { |
609 | a046433a | bellard | int i,j,long_index=s->directory.next;
|
610 | c227f099 | Anthony Liguori | direntry_t* entry = NULL;
|
611 | c227f099 | Anthony Liguori | direntry_t* entry_long = NULL;
|
612 | de167e41 | bellard | |
613 | de167e41 | bellard | if(is_dot) {
|
614 | de167e41 | bellard | entry=array_get_next(&(s->directory)); |
615 | de167e41 | bellard | memset(entry->name,0x20,11); |
616 | de167e41 | bellard | memcpy(entry->name,filename,strlen(filename)); |
617 | de167e41 | bellard | return entry;
|
618 | de167e41 | bellard | } |
619 | 3b46e624 | ths | |
620 | de167e41 | bellard | entry_long=create_long_filename(s,filename); |
621 | 3b46e624 | ths | |
622 | 5fafdf24 | ths | i = strlen(filename); |
623 | a046433a | bellard | for(j = i - 1; j>0 && filename[j]!='.';j--); |
624 | a046433a | bellard | if (j > 0) |
625 | a046433a | bellard | i = (j > 8 ? 8 : j); |
626 | a046433a | bellard | else if (i > 8) |
627 | a046433a | bellard | i = 8;
|
628 | a046433a | bellard | |
629 | de167e41 | bellard | entry=array_get_next(&(s->directory)); |
630 | de167e41 | bellard | memset(entry->name,0x20,11); |
631 | 51a0f568 | blueswir1 | memcpy(entry->name, filename, i); |
632 | 3b46e624 | ths | |
633 | a046433a | bellard | if(j > 0) |
634 | a046433a | bellard | for (i = 0; i < 3 && filename[j+1+i]; i++) |
635 | a046433a | bellard | entry->extension[i] = filename[j+1+i];
|
636 | de167e41 | bellard | |
637 | de167e41 | bellard | /* upcase & remove unwanted characters */
|
638 | de167e41 | bellard | for(i=10;i>=0;i--) { |
639 | a046433a | bellard | if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
640 | de167e41 | bellard | if(entry->name[i]<=' ' || entry->name[i]>0x7f |
641 | a046433a | bellard | || strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
|
642 | de167e41 | bellard | entry->name[i]='_';
|
643 | de167e41 | bellard | else if(entry->name[i]>='a' && entry->name[i]<='z') |
644 | de167e41 | bellard | entry->name[i]+='A'-'a'; |
645 | de167e41 | bellard | } |
646 | de167e41 | bellard | |
647 | de167e41 | bellard | /* mangle duplicates */
|
648 | de167e41 | bellard | while(1) { |
649 | c227f099 | Anthony Liguori | direntry_t* entry1=array_get(&(s->directory),directory_start); |
650 | de167e41 | bellard | int j;
|
651 | de167e41 | bellard | |
652 | de167e41 | bellard | for(;entry1<entry;entry1++)
|
653 | a046433a | bellard | if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
654 | de167e41 | bellard | break; /* found dupe */ |
655 | de167e41 | bellard | if(entry1==entry) /* no dupe found */ |
656 | de167e41 | bellard | break;
|
657 | de167e41 | bellard | |
658 | 5fafdf24 | ths | /* use all 8 characters of name */
|
659 | de167e41 | bellard | if(entry->name[7]==' ') { |
660 | de167e41 | bellard | int j;
|
661 | de167e41 | bellard | for(j=6;j>0 && entry->name[j]==' ';j--) |
662 | de167e41 | bellard | entry->name[j]='~';
|
663 | de167e41 | bellard | } |
664 | de167e41 | bellard | |
665 | de167e41 | bellard | /* increment number */
|
666 | de167e41 | bellard | for(j=7;j>0 && entry->name[j]=='9';j--) |
667 | de167e41 | bellard | entry->name[j]='0';
|
668 | de167e41 | bellard | if(j>0) { |
669 | de167e41 | bellard | if(entry->name[j]<'0' || entry->name[j]>'9') |
670 | de167e41 | bellard | entry->name[j]='0';
|
671 | de167e41 | bellard | else
|
672 | de167e41 | bellard | entry->name[j]++; |
673 | de167e41 | bellard | } |
674 | de167e41 | bellard | } |
675 | de167e41 | bellard | |
676 | de167e41 | bellard | /* calculate checksum; propagate to long name */
|
677 | de167e41 | bellard | if(entry_long) {
|
678 | de167e41 | bellard | uint8_t chksum=fat_chksum(entry); |
679 | de167e41 | bellard | |
680 | de167e41 | bellard | /* calculate anew, because realloc could have taken place */
|
681 | de167e41 | bellard | entry_long=array_get(&(s->directory),long_index); |
682 | a046433a | bellard | while(entry_long<entry && is_long_name(entry_long)) {
|
683 | de167e41 | bellard | entry_long->reserved[1]=chksum;
|
684 | de167e41 | bellard | entry_long++; |
685 | de167e41 | bellard | } |
686 | de167e41 | bellard | } |
687 | de167e41 | bellard | |
688 | de167e41 | bellard | return entry;
|
689 | de167e41 | bellard | } |
690 | de167e41 | bellard | |
691 | a046433a | bellard | /*
|
692 | a046433a | bellard | * Read a directory. (the index of the corresponding mapping must be passed).
|
693 | a046433a | bellard | */
|
694 | a046433a | bellard | static int read_directory(BDRVVVFATState* s, int mapping_index) |
695 | de167e41 | bellard | { |
696 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
697 | c227f099 | Anthony Liguori | direntry_t* direntry; |
698 | a046433a | bellard | const char* dirname = mapping->path; |
699 | a046433a | bellard | int first_cluster = mapping->begin;
|
700 | a046433a | bellard | int parent_index = mapping->info.dir.parent_mapping_index;
|
701 | c227f099 | Anthony Liguori | mapping_t* parent_mapping = (mapping_t*) |
702 | 511d2b14 | blueswir1 | (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL); |
703 | a046433a | bellard | int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
704 | de167e41 | bellard | |
705 | de167e41 | bellard | DIR* dir=opendir(dirname); |
706 | de167e41 | bellard | struct dirent* entry;
|
707 | de167e41 | bellard | int i;
|
708 | de167e41 | bellard | |
709 | a046433a | bellard | assert(mapping->mode & MODE_DIRECTORY); |
710 | a046433a | bellard | |
711 | a046433a | bellard | if(!dir) {
|
712 | a046433a | bellard | mapping->end = mapping->begin; |
713 | de167e41 | bellard | return -1; |
714 | a046433a | bellard | } |
715 | 3b46e624 | ths | |
716 | a046433a | bellard | i = mapping->info.dir.first_dir_index = |
717 | a046433a | bellard | first_cluster == 0 ? 0 : s->directory.next; |
718 | a046433a | bellard | |
719 | 5fafdf24 | ths | /* actually read the directory, and allocate the mappings */
|
720 | de167e41 | bellard | while((entry=readdir(dir))) {
|
721 | de167e41 | bellard | unsigned int length=strlen(dirname)+2+strlen(entry->d_name); |
722 | de167e41 | bellard | char* buffer;
|
723 | c227f099 | Anthony Liguori | direntry_t* direntry; |
724 | a046433a | bellard | struct stat st;
|
725 | de167e41 | bellard | int is_dot=!strcmp(entry->d_name,"."); |
726 | de167e41 | bellard | int is_dotdot=!strcmp(entry->d_name,".."); |
727 | de167e41 | bellard | |
728 | a046433a | bellard | if(first_cluster == 0 && (is_dotdot || is_dot)) |
729 | de167e41 | bellard | continue;
|
730 | 5fafdf24 | ths | |
731 | 3ec88e80 | aliguori | buffer=(char*)qemu_malloc(length);
|
732 | de167e41 | bellard | snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
733 | de167e41 | bellard | |
734 | de167e41 | bellard | if(stat(buffer,&st)<0) { |
735 | de167e41 | bellard | free(buffer); |
736 | de167e41 | bellard | continue;
|
737 | de167e41 | bellard | } |
738 | de167e41 | bellard | |
739 | de167e41 | bellard | /* create directory entry for this file */
|
740 | a046433a | bellard | direntry=create_short_and_long_name(s, i, entry->d_name, |
741 | a046433a | bellard | is_dot || is_dotdot); |
742 | de167e41 | bellard | direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
743 | de167e41 | bellard | direntry->reserved[0]=direntry->reserved[1]=0; |
744 | de167e41 | bellard | direntry->ctime=fat_datetime(st.st_ctime,1);
|
745 | de167e41 | bellard | direntry->cdate=fat_datetime(st.st_ctime,0);
|
746 | de167e41 | bellard | direntry->adate=fat_datetime(st.st_atime,0);
|
747 | de167e41 | bellard | direntry->begin_hi=0;
|
748 | de167e41 | bellard | direntry->mtime=fat_datetime(st.st_mtime,1);
|
749 | de167e41 | bellard | direntry->mdate=fat_datetime(st.st_mtime,0);
|
750 | de167e41 | bellard | if(is_dotdot)
|
751 | a046433a | bellard | set_begin_of_direntry(direntry, first_cluster_of_parent); |
752 | de167e41 | bellard | else if(is_dot) |
753 | a046433a | bellard | set_begin_of_direntry(direntry, first_cluster); |
754 | de167e41 | bellard | else
|
755 | a046433a | bellard | direntry->begin=0; /* do that later */ |
756 | a046433a | bellard | if (st.st_size > 0x7fffffff) { |
757 | a046433a | bellard | fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
758 | a046433a | bellard | free(buffer); |
759 | a046433a | bellard | return -2; |
760 | a046433a | bellard | } |
761 | a046433a | bellard | direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
762 | de167e41 | bellard | |
763 | de167e41 | bellard | /* create mapping for this file */
|
764 | a046433a | bellard | if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
765 | c227f099 | Anthony Liguori | s->current_mapping=(mapping_t*)array_get_next(&(s->mapping)); |
766 | de167e41 | bellard | s->current_mapping->begin=0;
|
767 | de167e41 | bellard | s->current_mapping->end=st.st_size; |
768 | a046433a | bellard | /*
|
769 | a046433a | bellard | * we get the direntry of the most recent direntry, which
|
770 | a046433a | bellard | * contains the short name and all the relevant information.
|
771 | a046433a | bellard | */
|
772 | de167e41 | bellard | s->current_mapping->dir_index=s->directory.next-1;
|
773 | a046433a | bellard | s->current_mapping->first_mapping_index = -1;
|
774 | a046433a | bellard | if (S_ISDIR(st.st_mode)) {
|
775 | a046433a | bellard | s->current_mapping->mode = MODE_DIRECTORY; |
776 | a046433a | bellard | s->current_mapping->info.dir.parent_mapping_index = |
777 | a046433a | bellard | mapping_index; |
778 | a046433a | bellard | } else {
|
779 | a046433a | bellard | s->current_mapping->mode = MODE_UNDEFINED; |
780 | a046433a | bellard | s->current_mapping->info.file.offset = 0;
|
781 | a046433a | bellard | } |
782 | a046433a | bellard | s->current_mapping->path=buffer; |
783 | a046433a | bellard | s->current_mapping->read_only = |
784 | a046433a | bellard | (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
785 | de167e41 | bellard | } |
786 | de167e41 | bellard | } |
787 | de167e41 | bellard | closedir(dir); |
788 | de167e41 | bellard | |
789 | de167e41 | bellard | /* fill with zeroes up to the end of the cluster */
|
790 | de167e41 | bellard | while(s->directory.next%(0x10*s->sectors_per_cluster)) { |
791 | c227f099 | Anthony Liguori | direntry_t* direntry=array_get_next(&(s->directory)); |
792 | c227f099 | Anthony Liguori | memset(direntry,0,sizeof(direntry_t)); |
793 | de167e41 | bellard | } |
794 | de167e41 | bellard | |
795 | a046433a | bellard | /* TODO: if there are more entries, bootsector has to be adjusted! */
|
796 | a046433a | bellard | #define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) |
797 | a046433a | bellard | if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { |
798 | a046433a | bellard | /* root directory */
|
799 | a046433a | bellard | int cur = s->directory.next;
|
800 | a046433a | bellard | array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
|
801 | a046433a | bellard | memset(array_get(&(s->directory), cur), 0,
|
802 | c227f099 | Anthony Liguori | (ROOT_ENTRIES - cur) * sizeof(direntry_t));
|
803 | de167e41 | bellard | } |
804 | 5fafdf24 | ths | |
805 | a046433a | bellard | /* reget the mapping, since s->mapping was possibly realloc()ed */
|
806 | c227f099 | Anthony Liguori | mapping = (mapping_t*)array_get(&(s->mapping), mapping_index); |
807 | a046433a | bellard | first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
808 | a046433a | bellard | * 0x20 / s->cluster_size;
|
809 | a046433a | bellard | mapping->end = first_cluster; |
810 | a046433a | bellard | |
811 | c227f099 | Anthony Liguori | direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index); |
812 | a046433a | bellard | set_begin_of_direntry(direntry, mapping->begin); |
813 | 3b46e624 | ths | |
814 | a046433a | bellard | return 0; |
815 | a046433a | bellard | } |
816 | de167e41 | bellard | |
817 | a046433a | bellard | static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
818 | a046433a | bellard | { |
819 | a046433a | bellard | return (sector_num-s->faked_sectors)/s->sectors_per_cluster;
|
820 | a046433a | bellard | } |
821 | de167e41 | bellard | |
822 | a046433a | bellard | static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
823 | a046433a | bellard | { |
824 | a046433a | bellard | return s->faked_sectors + s->sectors_per_cluster * cluster_num;
|
825 | a046433a | bellard | } |
826 | de167e41 | bellard | |
827 | a046433a | bellard | static inline uint32_t sector_offset_in_cluster(BDRVVVFATState* s,off_t sector_num) |
828 | a046433a | bellard | { |
829 | a046433a | bellard | return (sector_num-s->first_sectors_number-2*s->sectors_per_fat)%s->sectors_per_cluster; |
830 | a046433a | bellard | } |
831 | de167e41 | bellard | |
832 | a046433a | bellard | #ifdef DBG
|
833 | c227f099 | Anthony Liguori | static direntry_t* get_direntry_for_mapping(BDRVVVFATState* s,mapping_t* mapping)
|
834 | a046433a | bellard | { |
835 | a046433a | bellard | if(mapping->mode==MODE_UNDEFINED)
|
836 | a046433a | bellard | return 0; |
837 | c227f099 | Anthony Liguori | return (direntry_t*)(s->directory.pointer+sizeof(direntry_t)*mapping->dir_index); |
838 | de167e41 | bellard | } |
839 | a046433a | bellard | #endif
|
840 | de167e41 | bellard | |
841 | a046433a | bellard | static int init_directories(BDRVVVFATState* s, |
842 | a046433a | bellard | const char* dirname) |
843 | de167e41 | bellard | { |
844 | c227f099 | Anthony Liguori | bootsector_t* bootsector; |
845 | c227f099 | Anthony Liguori | mapping_t* mapping; |
846 | de167e41 | bellard | unsigned int i; |
847 | de167e41 | bellard | unsigned int cluster; |
848 | de167e41 | bellard | |
849 | de167e41 | bellard | memset(&(s->first_sectors[0]),0,0x40*0x200); |
850 | de167e41 | bellard | |
851 | de167e41 | bellard | s->cluster_size=s->sectors_per_cluster*0x200;
|
852 | 3ec88e80 | aliguori | s->cluster_buffer=qemu_malloc(s->cluster_size); |
853 | a046433a | bellard | |
854 | a046433a | bellard | /*
|
855 | a046433a | bellard | * The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
856 | a046433a | bellard | * where sc is sector_count,
|
857 | a046433a | bellard | * spf is sectors_per_fat,
|
858 | a046433a | bellard | * spc is sectors_per_clusters, and
|
859 | a046433a | bellard | * fat_type = 12, 16 or 32.
|
860 | a046433a | bellard | */
|
861 | a046433a | bellard | i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; |
862 | a046433a | bellard | s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
863 | 3b46e624 | ths | |
864 | c227f099 | Anthony Liguori | array_init(&(s->mapping),sizeof(mapping_t));
|
865 | c227f099 | Anthony Liguori | array_init(&(s->directory),sizeof(direntry_t));
|
866 | de167e41 | bellard | |
867 | de167e41 | bellard | /* add volume label */
|
868 | de167e41 | bellard | { |
869 | c227f099 | Anthony Liguori | direntry_t* entry=array_get_next(&(s->directory)); |
870 | de167e41 | bellard | entry->attributes=0x28; /* archive | volume label */ |
871 | ffe8ab83 | ths | snprintf((char*)entry->name,11,"QEMU VVFAT"); |
872 | de167e41 | bellard | } |
873 | de167e41 | bellard | |
874 | de167e41 | bellard | /* Now build FAT, and write back information into directory */
|
875 | de167e41 | bellard | init_fat(s); |
876 | de167e41 | bellard | |
877 | a046433a | bellard | s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
|
878 | a046433a | bellard | s->cluster_count=sector2cluster(s, s->sector_count); |
879 | a046433a | bellard | |
880 | a046433a | bellard | mapping = array_get_next(&(s->mapping)); |
881 | a046433a | bellard | mapping->begin = 0;
|
882 | a046433a | bellard | mapping->dir_index = 0;
|
883 | a046433a | bellard | mapping->info.dir.parent_mapping_index = -1;
|
884 | a046433a | bellard | mapping->first_mapping_index = -1;
|
885 | a046433a | bellard | mapping->path = strdup(dirname); |
886 | a046433a | bellard | i = strlen(mapping->path); |
887 | a046433a | bellard | if (i > 0 && mapping->path[i - 1] == '/') |
888 | a046433a | bellard | mapping->path[i - 1] = '\0'; |
889 | a046433a | bellard | mapping->mode = MODE_DIRECTORY; |
890 | a046433a | bellard | mapping->read_only = 0;
|
891 | a046433a | bellard | s->path = mapping->path; |
892 | a046433a | bellard | |
893 | a046433a | bellard | for (i = 0, cluster = 0; i < s->mapping.next; i++) { |
894 | 5fafdf24 | ths | /* MS-DOS expects the FAT to be 0 for the root directory
|
895 | a046433a | bellard | * (except for the media byte). */
|
896 | a046433a | bellard | /* LATER TODO: still true for FAT32? */
|
897 | a046433a | bellard | int fix_fat = (i != 0); |
898 | a046433a | bellard | mapping = array_get(&(s->mapping), i); |
899 | a046433a | bellard | |
900 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
901 | a046433a | bellard | mapping->begin = cluster; |
902 | a046433a | bellard | if(read_directory(s, i)) {
|
903 | a046433a | bellard | fprintf(stderr, "Could not read directory %s\n",
|
904 | a046433a | bellard | mapping->path); |
905 | de167e41 | bellard | return -1; |
906 | de167e41 | bellard | } |
907 | a046433a | bellard | mapping = array_get(&(s->mapping), i); |
908 | a046433a | bellard | } else {
|
909 | a046433a | bellard | assert(mapping->mode == MODE_UNDEFINED); |
910 | de167e41 | bellard | mapping->mode=MODE_NORMAL; |
911 | a046433a | bellard | mapping->begin = cluster; |
912 | a046433a | bellard | if (mapping->end > 0) { |
913 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), |
914 | a046433a | bellard | mapping->dir_index); |
915 | a046433a | bellard | |
916 | a046433a | bellard | mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; |
917 | a046433a | bellard | set_begin_of_direntry(direntry, mapping->begin); |
918 | a046433a | bellard | } else {
|
919 | a046433a | bellard | mapping->end = cluster + 1;
|
920 | a046433a | bellard | fix_fat = 0;
|
921 | de167e41 | bellard | } |
922 | a046433a | bellard | } |
923 | a046433a | bellard | |
924 | a046433a | bellard | assert(mapping->begin < mapping->end); |
925 | a046433a | bellard | |
926 | 8ce0f869 | balrog | /* next free cluster */
|
927 | 8ce0f869 | balrog | cluster = mapping->end; |
928 | 8ce0f869 | balrog | |
929 | 8ce0f869 | balrog | if(cluster > s->cluster_count) {
|
930 | 8ce0f869 | balrog | fprintf(stderr,"Directory does not fit in FAT%d (capacity %s)\n",
|
931 | 8ce0f869 | balrog | s->fat_type, |
932 | 8ce0f869 | balrog | s->fat_type == 12 ? s->sector_count == 2880 ? "1.44 MB" |
933 | 8ce0f869 | balrog | : "2.88 MB"
|
934 | 8ce0f869 | balrog | : "504MB");
|
935 | 8ce0f869 | balrog | return -EINVAL;
|
936 | 8ce0f869 | balrog | } |
937 | 8ce0f869 | balrog | |
938 | a046433a | bellard | /* fix fat for entry */
|
939 | a046433a | bellard | if (fix_fat) {
|
940 | 8ce0f869 | balrog | int j;
|
941 | a046433a | bellard | for(j = mapping->begin; j < mapping->end - 1; j++) |
942 | a046433a | bellard | fat_set(s, j, j+1);
|
943 | a046433a | bellard | fat_set(s, mapping->end - 1, s->max_fat_value);
|
944 | a046433a | bellard | } |
945 | de167e41 | bellard | } |
946 | de167e41 | bellard | |
947 | a046433a | bellard | mapping = array_get(&(s->mapping), 0);
|
948 | a046433a | bellard | s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; |
949 | a046433a | bellard | s->last_cluster_of_root_directory = mapping->end; |
950 | a046433a | bellard | |
951 | a046433a | bellard | /* the FAT signature */
|
952 | a046433a | bellard | fat_set(s,0,s->max_fat_value);
|
953 | a046433a | bellard | fat_set(s,1,s->max_fat_value);
|
954 | de167e41 | bellard | |
955 | a046433a | bellard | s->current_mapping = NULL;
|
956 | a046433a | bellard | |
957 | c227f099 | Anthony Liguori | bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
958 | de167e41 | bellard | bootsector->jump[0]=0xeb; |
959 | de167e41 | bellard | bootsector->jump[1]=0x3e; |
960 | de167e41 | bellard | bootsector->jump[2]=0x90; |
961 | de167e41 | bellard | memcpy(bootsector->name,"QEMU ",8); |
962 | de167e41 | bellard | bootsector->sector_size=cpu_to_le16(0x200);
|
963 | de167e41 | bellard | bootsector->sectors_per_cluster=s->sectors_per_cluster; |
964 | de167e41 | bellard | bootsector->reserved_sectors=cpu_to_le16(1);
|
965 | de167e41 | bellard | bootsector->number_of_fats=0x2; /* number of FATs */ |
966 | de167e41 | bellard | bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
|
967 | a046433a | bellard | bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
968 | a046433a | bellard | bootsector->media_type=(s->fat_type!=12?0xf8:s->sector_count==5760?0xf9:0xf8); /* media descriptor */ |
969 | a046433a | bellard | s->fat.pointer[0] = bootsector->media_type;
|
970 | de167e41 | bellard | bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
971 | a046433a | bellard | bootsector->sectors_per_track=cpu_to_le16(s->bs->secs); |
972 | a046433a | bellard | bootsector->number_of_heads=cpu_to_le16(s->bs->heads); |
973 | de167e41 | bellard | bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
974 | a046433a | bellard | bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
975 | de167e41 | bellard | |
976 | a046433a | bellard | /* LATER TODO: if FAT32, this is wrong */
|
977 | a046433a | bellard | bootsector->u.fat16.drive_number=s->fat_type==12?0:0x80; /* assume this is hda (TODO) */ |
978 | de167e41 | bellard | bootsector->u.fat16.current_head=0;
|
979 | de167e41 | bellard | bootsector->u.fat16.signature=0x29;
|
980 | de167e41 | bellard | bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
981 | de167e41 | bellard | |
982 | de167e41 | bellard | memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11); |
983 | de167e41 | bellard | memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
984 | de167e41 | bellard | bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; |
985 | de167e41 | bellard | |
986 | de167e41 | bellard | return 0; |
987 | de167e41 | bellard | } |
988 | de167e41 | bellard | |
989 | 83f64091 | bellard | #ifdef DEBUG
|
990 | a046433a | bellard | static BDRVVVFATState *vvv = NULL; |
991 | 83f64091 | bellard | #endif
|
992 | a046433a | bellard | |
993 | a046433a | bellard | static int enable_write_target(BDRVVVFATState *s); |
994 | a046433a | bellard | static int is_consistent(BDRVVVFATState *s); |
995 | a046433a | bellard | |
996 | 83f64091 | bellard | static int vvfat_open(BlockDriverState *bs, const char* dirname, int flags) |
997 | de167e41 | bellard | { |
998 | de167e41 | bellard | BDRVVVFATState *s = bs->opaque; |
999 | a046433a | bellard | int floppy = 0; |
1000 | de167e41 | bellard | int i;
|
1001 | de167e41 | bellard | |
1002 | 83f64091 | bellard | #ifdef DEBUG
|
1003 | a046433a | bellard | vvv = s; |
1004 | 83f64091 | bellard | #endif
|
1005 | a046433a | bellard | |
1006 | a046433a | bellard | DLOG(if (stderr == NULL) { |
1007 | a046433a | bellard | stderr = fopen("vvfat.log", "a"); |
1008 | a046433a | bellard | setbuf(stderr, NULL);
|
1009 | a046433a | bellard | }) |
1010 | a046433a | bellard | |
1011 | a046433a | bellard | s->bs = bs; |
1012 | a046433a | bellard | |
1013 | de167e41 | bellard | s->fat_type=16;
|
1014 | a046433a | bellard | /* LATER TODO: if FAT32, adjust */
|
1015 | a046433a | bellard | s->sectors_per_cluster=0x10;
|
1016 | b570094d | ths | /* 504MB disk*/
|
1017 | b570094d | ths | bs->cyls=1024; bs->heads=16; bs->secs=63; |
1018 | de167e41 | bellard | |
1019 | de167e41 | bellard | s->current_cluster=0xffffffff;
|
1020 | de167e41 | bellard | |
1021 | de167e41 | bellard | s->first_sectors_number=0x40;
|
1022 | a046433a | bellard | /* read only is the default for safety */
|
1023 | a046433a | bellard | bs->read_only = 1;
|
1024 | a046433a | bellard | s->qcow = s->write_target = NULL;
|
1025 | a046433a | bellard | s->qcow_filename = NULL;
|
1026 | a046433a | bellard | s->fat2 = NULL;
|
1027 | a046433a | bellard | s->downcase_short_names = 1;
|
1028 | 3b46e624 | ths | |
1029 | a046433a | bellard | if (!strstart(dirname, "fat:", NULL)) |
1030 | a046433a | bellard | return -1; |
1031 | a046433a | bellard | |
1032 | a046433a | bellard | if (strstr(dirname, ":floppy:")) { |
1033 | a046433a | bellard | floppy = 1;
|
1034 | a046433a | bellard | s->fat_type = 12;
|
1035 | a046433a | bellard | s->first_sectors_number = 1;
|
1036 | a046433a | bellard | s->sectors_per_cluster=2;
|
1037 | a046433a | bellard | bs->cyls = 80; bs->heads = 2; bs->secs = 36; |
1038 | a046433a | bellard | } |
1039 | a046433a | bellard | |
1040 | b570094d | ths | s->sector_count=bs->cyls*bs->heads*bs->secs; |
1041 | b570094d | ths | |
1042 | a046433a | bellard | if (strstr(dirname, ":32:")) { |
1043 | a046433a | bellard | fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
|
1044 | a046433a | bellard | s->fat_type = 32;
|
1045 | a046433a | bellard | } else if (strstr(dirname, ":16:")) { |
1046 | a046433a | bellard | s->fat_type = 16;
|
1047 | a046433a | bellard | } else if (strstr(dirname, ":12:")) { |
1048 | a046433a | bellard | s->fat_type = 12;
|
1049 | a046433a | bellard | s->sector_count=2880;
|
1050 | de167e41 | bellard | } |
1051 | a046433a | bellard | |
1052 | b570094d | ths | if (strstr(dirname, ":rw:")) { |
1053 | b570094d | ths | if (enable_write_target(s))
|
1054 | b570094d | ths | return -1; |
1055 | b570094d | ths | bs->read_only = 0;
|
1056 | b570094d | ths | } |
1057 | b570094d | ths | |
1058 | a046433a | bellard | i = strrchr(dirname, ':') - dirname;
|
1059 | a046433a | bellard | assert(i >= 3);
|
1060 | cd390083 | blueswir1 | if (dirname[i-2] == ':' && qemu_isalpha(dirname[i-1])) |
1061 | a046433a | bellard | /* workaround for DOS drive names */
|
1062 | a046433a | bellard | dirname += i-1;
|
1063 | a046433a | bellard | else
|
1064 | a046433a | bellard | dirname += i+1;
|
1065 | a046433a | bellard | |
1066 | a046433a | bellard | bs->total_sectors=bs->cyls*bs->heads*bs->secs; |
1067 | b570094d | ths | |
1068 | a046433a | bellard | if(init_directories(s, dirname))
|
1069 | de167e41 | bellard | return -1; |
1070 | de167e41 | bellard | |
1071 | b570094d | ths | s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; |
1072 | b570094d | ths | |
1073 | de167e41 | bellard | if(s->first_sectors_number==0x40) |
1074 | de167e41 | bellard | init_mbr(s); |
1075 | de167e41 | bellard | |
1076 | a046433a | bellard | /* for some reason or other, MS-DOS does not like to know about CHS... */
|
1077 | a046433a | bellard | if (floppy)
|
1078 | a046433a | bellard | bs->heads = bs->cyls = bs->secs = 0;
|
1079 | a046433a | bellard | |
1080 | a046433a | bellard | // assert(is_consistent(s));
|
1081 | de167e41 | bellard | return 0; |
1082 | de167e41 | bellard | } |
1083 | de167e41 | bellard | |
1084 | de167e41 | bellard | static inline void vvfat_close_current_file(BDRVVVFATState *s) |
1085 | de167e41 | bellard | { |
1086 | de167e41 | bellard | if(s->current_mapping) {
|
1087 | a046433a | bellard | s->current_mapping = NULL;
|
1088 | a046433a | bellard | if (s->current_fd) {
|
1089 | a046433a | bellard | close(s->current_fd); |
1090 | a046433a | bellard | s->current_fd = 0;
|
1091 | a046433a | bellard | } |
1092 | de167e41 | bellard | } |
1093 | a046433a | bellard | s->current_cluster = -1;
|
1094 | de167e41 | bellard | } |
1095 | de167e41 | bellard | |
1096 | de167e41 | bellard | /* mappings between index1 and index2-1 are supposed to be ordered
|
1097 | de167e41 | bellard | * return value is the index of the last mapping for which end>cluster_num
|
1098 | de167e41 | bellard | */
|
1099 | de167e41 | bellard | static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) |
1100 | de167e41 | bellard | { |
1101 | de167e41 | bellard | int index3=index1+1; |
1102 | de167e41 | bellard | while(1) { |
1103 | c227f099 | Anthony Liguori | mapping_t* mapping; |
1104 | de167e41 | bellard | index3=(index1+index2)/2;
|
1105 | de167e41 | bellard | mapping=array_get(&(s->mapping),index3); |
1106 | a046433a | bellard | assert(mapping->begin < mapping->end); |
1107 | a046433a | bellard | if(mapping->begin>=cluster_num) {
|
1108 | de167e41 | bellard | assert(index2!=index3 || index2==0);
|
1109 | de167e41 | bellard | if(index2==index3)
|
1110 | a046433a | bellard | return index1;
|
1111 | de167e41 | bellard | index2=index3; |
1112 | de167e41 | bellard | } else {
|
1113 | de167e41 | bellard | if(index1==index3)
|
1114 | a046433a | bellard | return mapping->end<=cluster_num ? index2 : index1;
|
1115 | de167e41 | bellard | index1=index3; |
1116 | de167e41 | bellard | } |
1117 | de167e41 | bellard | assert(index1<=index2); |
1118 | a046433a | bellard | DLOG(mapping=array_get(&(s->mapping),index1); |
1119 | a046433a | bellard | assert(mapping->begin<=cluster_num); |
1120 | 5fafdf24 | ths | assert(index2 >= s->mapping.next || |
1121 | a046433a | bellard | ((mapping = array_get(&(s->mapping),index2)) && |
1122 | a046433a | bellard | mapping->end>cluster_num))); |
1123 | de167e41 | bellard | } |
1124 | de167e41 | bellard | } |
1125 | de167e41 | bellard | |
1126 | c227f099 | Anthony Liguori | static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
1127 | de167e41 | bellard | { |
1128 | de167e41 | bellard | int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); |
1129 | c227f099 | Anthony Liguori | mapping_t* mapping; |
1130 | de167e41 | bellard | if(index>=s->mapping.next)
|
1131 | 511d2b14 | blueswir1 | return NULL; |
1132 | de167e41 | bellard | mapping=array_get(&(s->mapping),index); |
1133 | de167e41 | bellard | if(mapping->begin>cluster_num)
|
1134 | 511d2b14 | blueswir1 | return NULL; |
1135 | a046433a | bellard | assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
1136 | de167e41 | bellard | return mapping;
|
1137 | de167e41 | bellard | } |
1138 | de167e41 | bellard | |
1139 | a046433a | bellard | /*
|
1140 | a046433a | bellard | * This function simply compares path == mapping->path. Since the mappings
|
1141 | a046433a | bellard | * are sorted by cluster, this is expensive: O(n).
|
1142 | a046433a | bellard | */
|
1143 | c227f099 | Anthony Liguori | static inline mapping_t* find_mapping_for_path(BDRVVVFATState* s, |
1144 | a046433a | bellard | const char* path) |
1145 | a046433a | bellard | { |
1146 | a046433a | bellard | int i;
|
1147 | a046433a | bellard | |
1148 | a046433a | bellard | for (i = 0; i < s->mapping.next; i++) { |
1149 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
1150 | a046433a | bellard | if (mapping->first_mapping_index < 0 && |
1151 | a046433a | bellard | !strcmp(path, mapping->path)) |
1152 | a046433a | bellard | return mapping;
|
1153 | a046433a | bellard | } |
1154 | a046433a | bellard | |
1155 | a046433a | bellard | return NULL; |
1156 | a046433a | bellard | } |
1157 | a046433a | bellard | |
1158 | c227f099 | Anthony Liguori | static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
1159 | de167e41 | bellard | { |
1160 | de167e41 | bellard | if(!mapping)
|
1161 | de167e41 | bellard | return -1; |
1162 | de167e41 | bellard | if(!s->current_mapping ||
|
1163 | a046433a | bellard | strcmp(s->current_mapping->path,mapping->path)) { |
1164 | de167e41 | bellard | /* open file */
|
1165 | a046433a | bellard | int fd = open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
1166 | de167e41 | bellard | if(fd<0) |
1167 | de167e41 | bellard | return -1; |
1168 | de167e41 | bellard | vvfat_close_current_file(s); |
1169 | de167e41 | bellard | s->current_fd = fd; |
1170 | de167e41 | bellard | s->current_mapping = mapping; |
1171 | de167e41 | bellard | } |
1172 | de167e41 | bellard | return 0; |
1173 | de167e41 | bellard | } |
1174 | de167e41 | bellard | |
1175 | de167e41 | bellard | static inline int read_cluster(BDRVVVFATState *s,int cluster_num) |
1176 | de167e41 | bellard | { |
1177 | de167e41 | bellard | if(s->current_cluster != cluster_num) {
|
1178 | de167e41 | bellard | int result=0; |
1179 | de167e41 | bellard | off_t offset; |
1180 | a046433a | bellard | assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
1181 | de167e41 | bellard | if(!s->current_mapping
|
1182 | de167e41 | bellard | || s->current_mapping->begin>cluster_num |
1183 | de167e41 | bellard | || s->current_mapping->end<=cluster_num) { |
1184 | de167e41 | bellard | /* binary search of mappings for file */
|
1185 | c227f099 | Anthony Liguori | mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
1186 | a046433a | bellard | |
1187 | a046433a | bellard | assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); |
1188 | a046433a | bellard | |
1189 | a046433a | bellard | if (mapping && mapping->mode & MODE_DIRECTORY) {
|
1190 | a046433a | bellard | vvfat_close_current_file(s); |
1191 | a046433a | bellard | s->current_mapping = mapping; |
1192 | a046433a | bellard | read_cluster_directory:
|
1193 | a046433a | bellard | offset = s->cluster_size*(cluster_num-s->current_mapping->begin); |
1194 | ffe8ab83 | ths | s->cluster = (unsigned char*)s->directory.pointer+offset |
1195 | a046433a | bellard | + 0x20*s->current_mapping->info.dir.first_dir_index;
|
1196 | a046433a | bellard | assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); |
1197 | a046433a | bellard | assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
1198 | a046433a | bellard | s->current_cluster = cluster_num; |
1199 | a046433a | bellard | return 0; |
1200 | a046433a | bellard | } |
1201 | a046433a | bellard | |
1202 | a046433a | bellard | if(open_file(s,mapping))
|
1203 | de167e41 | bellard | return -2; |
1204 | a046433a | bellard | } else if (s->current_mapping->mode & MODE_DIRECTORY) |
1205 | a046433a | bellard | goto read_cluster_directory;
|
1206 | de167e41 | bellard | |
1207 | a046433a | bellard | assert(s->current_fd); |
1208 | a046433a | bellard | |
1209 | a046433a | bellard | offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; |
1210 | de167e41 | bellard | if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
1211 | de167e41 | bellard | return -3; |
1212 | a046433a | bellard | s->cluster=s->cluster_buffer; |
1213 | de167e41 | bellard | result=read(s->current_fd,s->cluster,s->cluster_size); |
1214 | de167e41 | bellard | if(result<0) { |
1215 | de167e41 | bellard | s->current_cluster = -1;
|
1216 | de167e41 | bellard | return -1; |
1217 | de167e41 | bellard | } |
1218 | de167e41 | bellard | s->current_cluster = cluster_num; |
1219 | de167e41 | bellard | } |
1220 | de167e41 | bellard | return 0; |
1221 | de167e41 | bellard | } |
1222 | de167e41 | bellard | |
1223 | a046433a | bellard | #ifdef DEBUG
|
1224 | a046433a | bellard | static void hexdump(const void* address, uint32_t len) |
1225 | de167e41 | bellard | { |
1226 | a046433a | bellard | const unsigned char* p = address; |
1227 | a046433a | bellard | int i, j;
|
1228 | a046433a | bellard | |
1229 | a046433a | bellard | for (i = 0; i < len; i += 16) { |
1230 | a046433a | bellard | for (j = 0; j < 16 && i + j < len; j++) |
1231 | a046433a | bellard | fprintf(stderr, "%02x ", p[i + j]);
|
1232 | a046433a | bellard | for (; j < 16; j++) |
1233 | a046433a | bellard | fprintf(stderr, " ");
|
1234 | a046433a | bellard | fprintf(stderr, " ");
|
1235 | a046433a | bellard | for (j = 0; j < 16 && i + j < len; j++) |
1236 | a046433a | bellard | fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]); |
1237 | a046433a | bellard | fprintf(stderr, "\n");
|
1238 | de167e41 | bellard | } |
1239 | de167e41 | bellard | } |
1240 | de167e41 | bellard | |
1241 | c227f099 | Anthony Liguori | static void print_direntry(const direntry_t* direntry) |
1242 | de167e41 | bellard | { |
1243 | a046433a | bellard | int j = 0; |
1244 | a046433a | bellard | char buffer[1024]; |
1245 | a046433a | bellard | |
1246 | a046433a | bellard | fprintf(stderr, "direntry 0x%x: ", (int)direntry); |
1247 | de167e41 | bellard | if(!direntry)
|
1248 | de167e41 | bellard | return;
|
1249 | a046433a | bellard | if(is_long_name(direntry)) {
|
1250 | de167e41 | bellard | unsigned char* c=(unsigned char*)direntry; |
1251 | de167e41 | bellard | int i;
|
1252 | de167e41 | bellard | for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) |
1253 | 3891b370 | blueswir1 | #define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;} |
1254 | a046433a | bellard | ADD_CHAR(c[i]); |
1255 | de167e41 | bellard | for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
1256 | a046433a | bellard | ADD_CHAR(c[i]); |
1257 | de167e41 | bellard | for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
1258 | a046433a | bellard | ADD_CHAR(c[i]); |
1259 | a046433a | bellard | buffer[j] = 0;
|
1260 | a046433a | bellard | fprintf(stderr, "%s\n", buffer);
|
1261 | de167e41 | bellard | } else {
|
1262 | de167e41 | bellard | int i;
|
1263 | de167e41 | bellard | for(i=0;i<11;i++) |
1264 | a046433a | bellard | ADD_CHAR(direntry->name[i]); |
1265 | a046433a | bellard | buffer[j] = 0;
|
1266 | a046433a | bellard | fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
1267 | a046433a | bellard | buffer, |
1268 | de167e41 | bellard | direntry->attributes, |
1269 | a046433a | bellard | begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
1270 | de167e41 | bellard | } |
1271 | de167e41 | bellard | } |
1272 | de167e41 | bellard | |
1273 | c227f099 | Anthony Liguori | static void print_mapping(const mapping_t* mapping) |
1274 | de167e41 | bellard | { |
1275 | a046433a | bellard | fprintf(stderr, "mapping (0x%x): begin, end = %d, %d, dir_index = %d, first_mapping_index = %d, name = %s, mode = 0x%x, " , (int)mapping, mapping->begin, mapping->end, mapping->dir_index, mapping->first_mapping_index, mapping->path, mapping->mode); |
1276 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY)
|
1277 | a046433a | bellard | fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
1278 | a046433a | bellard | else
|
1279 | a046433a | bellard | fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
1280 | de167e41 | bellard | } |
1281 | a046433a | bellard | #endif
|
1282 | de167e41 | bellard | |
1283 | 5fafdf24 | ths | static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
1284 | a046433a | bellard | uint8_t *buf, int nb_sectors)
|
1285 | de167e41 | bellard | { |
1286 | a046433a | bellard | BDRVVVFATState *s = bs->opaque; |
1287 | de167e41 | bellard | int i;
|
1288 | de167e41 | bellard | |
1289 | a046433a | bellard | for(i=0;i<nb_sectors;i++,sector_num++) { |
1290 | a046433a | bellard | if (sector_num >= s->sector_count)
|
1291 | a046433a | bellard | return -1; |
1292 | a046433a | bellard | if (s->qcow) {
|
1293 | a046433a | bellard | int n;
|
1294 | a046433a | bellard | if (s->qcow->drv->bdrv_is_allocated(s->qcow,
|
1295 | a046433a | bellard | sector_num, nb_sectors-i, &n)) { |
1296 | a046433a | bellard | DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
1297 | a046433a | bellard | if (s->qcow->drv->bdrv_read(s->qcow, sector_num, buf+i*0x200, n)) |
1298 | a046433a | bellard | return -1; |
1299 | a046433a | bellard | i += n - 1;
|
1300 | a046433a | bellard | sector_num += n - 1;
|
1301 | a046433a | bellard | continue;
|
1302 | a046433a | bellard | } |
1303 | a046433a | bellard | DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
1304 | de167e41 | bellard | } |
1305 | a046433a | bellard | if(sector_num<s->faked_sectors) {
|
1306 | a046433a | bellard | if(sector_num<s->first_sectors_number)
|
1307 | a046433a | bellard | memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); |
1308 | a046433a | bellard | else if(sector_num-s->first_sectors_number<s->sectors_per_fat) |
1309 | a046433a | bellard | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); |
1310 | a046433a | bellard | else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) |
1311 | a046433a | bellard | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); |
1312 | a046433a | bellard | } else {
|
1313 | a046433a | bellard | uint32_t sector=sector_num-s->faked_sectors, |
1314 | a046433a | bellard | sector_offset_in_cluster=(sector%s->sectors_per_cluster), |
1315 | a046433a | bellard | cluster_num=sector/s->sectors_per_cluster; |
1316 | a046433a | bellard | if(read_cluster(s, cluster_num) != 0) { |
1317 | a046433a | bellard | /* LATER TODO: strict: return -1; */
|
1318 | a046433a | bellard | memset(buf+i*0x200,0,0x200); |
1319 | a046433a | bellard | continue;
|
1320 | de167e41 | bellard | } |
1321 | a046433a | bellard | memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
1322 | de167e41 | bellard | } |
1323 | de167e41 | bellard | } |
1324 | de167e41 | bellard | return 0; |
1325 | de167e41 | bellard | } |
1326 | de167e41 | bellard | |
1327 | a046433a | bellard | /* LATER TODO: statify all functions */
|
1328 | de167e41 | bellard | |
1329 | a046433a | bellard | /*
|
1330 | a046433a | bellard | * Idea of the write support (use snapshot):
|
1331 | de167e41 | bellard | *
|
1332 | a046433a | bellard | * 1. check if all data is consistent, recording renames, modifications,
|
1333 | a046433a | bellard | * new files and directories (in s->commits).
|
1334 | de167e41 | bellard | *
|
1335 | a046433a | bellard | * 2. if the data is not consistent, stop committing
|
1336 | de167e41 | bellard | *
|
1337 | a046433a | bellard | * 3. handle renames, and create new files and directories (do not yet
|
1338 | a046433a | bellard | * write their contents)
|
1339 | de167e41 | bellard | *
|
1340 | a046433a | bellard | * 4. walk the directories, fixing the mapping and direntries, and marking
|
1341 | a046433a | bellard | * the handled mappings as not deleted
|
1342 | de167e41 | bellard | *
|
1343 | a046433a | bellard | * 5. commit the contents of the files
|
1344 | de167e41 | bellard | *
|
1345 | a046433a | bellard | * 6. handle deleted files and directories
|
1346 | de167e41 | bellard | *
|
1347 | de167e41 | bellard | */
|
1348 | de167e41 | bellard | |
1349 | c227f099 | Anthony Liguori | typedef struct commit_t { |
1350 | a046433a | bellard | char* path;
|
1351 | a046433a | bellard | union {
|
1352 | a046433a | bellard | struct { uint32_t cluster; } rename;
|
1353 | a046433a | bellard | struct { int dir_index; uint32_t modified_offset; } writeout; |
1354 | a046433a | bellard | struct { uint32_t first_cluster; } new_file;
|
1355 | a046433a | bellard | struct { uint32_t cluster; } mkdir;
|
1356 | a046433a | bellard | } param; |
1357 | a046433a | bellard | /* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
1358 | a046433a | bellard | enum {
|
1359 | a046433a | bellard | ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR |
1360 | a046433a | bellard | } action; |
1361 | c227f099 | Anthony Liguori | } commit_t; |
1362 | de167e41 | bellard | |
1363 | a046433a | bellard | static void clear_commits(BDRVVVFATState* s) |
1364 | de167e41 | bellard | { |
1365 | de167e41 | bellard | int i;
|
1366 | a046433a | bellard | DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
1367 | a046433a | bellard | for (i = 0; i < s->commits.next; i++) { |
1368 | c227f099 | Anthony Liguori | commit_t* commit = array_get(&(s->commits), i); |
1369 | a046433a | bellard | assert(commit->path || commit->action == ACTION_WRITEOUT); |
1370 | a046433a | bellard | if (commit->action != ACTION_WRITEOUT) {
|
1371 | a046433a | bellard | assert(commit->path); |
1372 | a046433a | bellard | free(commit->path); |
1373 | a046433a | bellard | } else
|
1374 | a046433a | bellard | assert(commit->path == NULL);
|
1375 | de167e41 | bellard | } |
1376 | a046433a | bellard | s->commits.next = 0;
|
1377 | de167e41 | bellard | } |
1378 | de167e41 | bellard | |
1379 | a046433a | bellard | static void schedule_rename(BDRVVVFATState* s, |
1380 | a046433a | bellard | uint32_t cluster, char* new_path)
|
1381 | de167e41 | bellard | { |
1382 | c227f099 | Anthony Liguori | commit_t* commit = array_get_next(&(s->commits)); |
1383 | a046433a | bellard | commit->path = new_path; |
1384 | a046433a | bellard | commit->param.rename.cluster = cluster; |
1385 | a046433a | bellard | commit->action = ACTION_RENAME; |
1386 | de167e41 | bellard | } |
1387 | de167e41 | bellard | |
1388 | a046433a | bellard | static void schedule_writeout(BDRVVVFATState* s, |
1389 | a046433a | bellard | int dir_index, uint32_t modified_offset)
|
1390 | de167e41 | bellard | { |
1391 | c227f099 | Anthony Liguori | commit_t* commit = array_get_next(&(s->commits)); |
1392 | a046433a | bellard | commit->path = NULL;
|
1393 | a046433a | bellard | commit->param.writeout.dir_index = dir_index; |
1394 | a046433a | bellard | commit->param.writeout.modified_offset = modified_offset; |
1395 | a046433a | bellard | commit->action = ACTION_WRITEOUT; |
1396 | de167e41 | bellard | } |
1397 | de167e41 | bellard | |
1398 | a046433a | bellard | static void schedule_new_file(BDRVVVFATState* s, |
1399 | a046433a | bellard | char* path, uint32_t first_cluster)
|
1400 | de167e41 | bellard | { |
1401 | c227f099 | Anthony Liguori | commit_t* commit = array_get_next(&(s->commits)); |
1402 | a046433a | bellard | commit->path = path; |
1403 | a046433a | bellard | commit->param.new_file.first_cluster = first_cluster; |
1404 | a046433a | bellard | commit->action = ACTION_NEW_FILE; |
1405 | a046433a | bellard | } |
1406 | a046433a | bellard | |
1407 | a046433a | bellard | static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) |
1408 | a046433a | bellard | { |
1409 | c227f099 | Anthony Liguori | commit_t* commit = array_get_next(&(s->commits)); |
1410 | a046433a | bellard | commit->path = path; |
1411 | a046433a | bellard | commit->param.mkdir.cluster = cluster; |
1412 | a046433a | bellard | commit->action = ACTION_MKDIR; |
1413 | a046433a | bellard | } |
1414 | a046433a | bellard | |
1415 | a046433a | bellard | typedef struct { |
1416 | 64eaabda | ths | /*
|
1417 | 64eaabda | ths | * Since the sequence number is at most 0x3f, and the filename
|
1418 | 64eaabda | ths | * length is at most 13 times the sequence number, the maximal
|
1419 | 64eaabda | ths | * filename length is 0x3f * 13 bytes.
|
1420 | 64eaabda | ths | */
|
1421 | 64eaabda | ths | unsigned char name[0x3f * 13 + 1]; |
1422 | a046433a | bellard | int checksum, len;
|
1423 | a046433a | bellard | int sequence_number;
|
1424 | a046433a | bellard | } long_file_name; |
1425 | a046433a | bellard | |
1426 | a046433a | bellard | static void lfn_init(long_file_name* lfn) |
1427 | a046433a | bellard | { |
1428 | a046433a | bellard | lfn->sequence_number = lfn->len = 0;
|
1429 | a046433a | bellard | lfn->checksum = 0x100;
|
1430 | a046433a | bellard | } |
1431 | a046433a | bellard | |
1432 | a046433a | bellard | /* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
1433 | a046433a | bellard | static int parse_long_name(long_file_name* lfn, |
1434 | c227f099 | Anthony Liguori | const direntry_t* direntry)
|
1435 | a046433a | bellard | { |
1436 | a046433a | bellard | int i, j, offset;
|
1437 | a046433a | bellard | const unsigned char* pointer = (const unsigned char*)direntry; |
1438 | a046433a | bellard | |
1439 | a046433a | bellard | if (!is_long_name(direntry))
|
1440 | a046433a | bellard | return 1; |
1441 | a046433a | bellard | |
1442 | a046433a | bellard | if (pointer[0] & 0x40) { |
1443 | a046433a | bellard | lfn->sequence_number = pointer[0] & 0x3f; |
1444 | a046433a | bellard | lfn->checksum = pointer[13];
|
1445 | a046433a | bellard | lfn->name[0] = 0; |
1446 | 59fdb018 | ths | lfn->name[lfn->sequence_number * 13] = 0; |
1447 | a046433a | bellard | } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
1448 | a046433a | bellard | return -1; |
1449 | a046433a | bellard | else if (pointer[13] != lfn->checksum) |
1450 | a046433a | bellard | return -2; |
1451 | a046433a | bellard | else if (pointer[12] || pointer[26] || pointer[27]) |
1452 | a046433a | bellard | return -3; |
1453 | a046433a | bellard | |
1454 | a046433a | bellard | offset = 13 * (lfn->sequence_number - 1); |
1455 | a046433a | bellard | for (i = 0, j = 1; i < 13; i++, j+=2) { |
1456 | a046433a | bellard | if (j == 11) |
1457 | a046433a | bellard | j = 14;
|
1458 | a046433a | bellard | else if (j == 26) |
1459 | a046433a | bellard | j = 28;
|
1460 | a046433a | bellard | |
1461 | a046433a | bellard | if (pointer[j+1] == 0) |
1462 | a046433a | bellard | lfn->name[offset + i] = pointer[j]; |
1463 | a046433a | bellard | else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) |
1464 | a046433a | bellard | return -4; |
1465 | a046433a | bellard | else
|
1466 | a046433a | bellard | lfn->name[offset + i] = 0;
|
1467 | de167e41 | bellard | } |
1468 | a046433a | bellard | |
1469 | a046433a | bellard | if (pointer[0] & 0x40) |
1470 | ffe8ab83 | ths | lfn->len = offset + strlen((char*)lfn->name + offset);
|
1471 | a046433a | bellard | |
1472 | de167e41 | bellard | return 0; |
1473 | de167e41 | bellard | } |
1474 | de167e41 | bellard | |
1475 | a046433a | bellard | /* returns 0 if successful, >0 if no short_name, and <0 on error */
|
1476 | a046433a | bellard | static int parse_short_name(BDRVVVFATState* s, |
1477 | c227f099 | Anthony Liguori | long_file_name* lfn, direntry_t* direntry) |
1478 | de167e41 | bellard | { |
1479 | a046433a | bellard | int i, j;
|
1480 | de167e41 | bellard | |
1481 | a046433a | bellard | if (!is_short_name(direntry))
|
1482 | a046433a | bellard | return 1; |
1483 | a046433a | bellard | |
1484 | a046433a | bellard | for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); |
1485 | a046433a | bellard | for (i = 0; i <= j; i++) { |
1486 | a046433a | bellard | if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) |
1487 | a046433a | bellard | return -1; |
1488 | a046433a | bellard | else if (s->downcase_short_names) |
1489 | 47398b9c | blueswir1 | lfn->name[i] = qemu_tolower(direntry->name[i]); |
1490 | a046433a | bellard | else
|
1491 | a046433a | bellard | lfn->name[i] = direntry->name[i]; |
1492 | de167e41 | bellard | } |
1493 | de167e41 | bellard | |
1494 | a046433a | bellard | for (j = 2; j >= 0 && direntry->extension[j] == ' '; j--); |
1495 | a046433a | bellard | if (j >= 0) { |
1496 | a046433a | bellard | lfn->name[i++] = '.';
|
1497 | a046433a | bellard | lfn->name[i + j + 1] = '\0'; |
1498 | a046433a | bellard | for (;j >= 0; j--) { |
1499 | a046433a | bellard | if (direntry->extension[j] <= ' ' || direntry->extension[j] > 0x7f) |
1500 | a046433a | bellard | return -2; |
1501 | a046433a | bellard | else if (s->downcase_short_names) |
1502 | 47398b9c | blueswir1 | lfn->name[i + j] = qemu_tolower(direntry->extension[j]); |
1503 | a046433a | bellard | else
|
1504 | a046433a | bellard | lfn->name[i + j] = direntry->extension[j]; |
1505 | a046433a | bellard | } |
1506 | a046433a | bellard | } else
|
1507 | a046433a | bellard | lfn->name[i + j + 1] = '\0'; |
1508 | a046433a | bellard | |
1509 | ffe8ab83 | ths | lfn->len = strlen((char*)lfn->name);
|
1510 | a046433a | bellard | |
1511 | a046433a | bellard | return 0; |
1512 | de167e41 | bellard | } |
1513 | de167e41 | bellard | |
1514 | a046433a | bellard | static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
1515 | a046433a | bellard | unsigned int cluster) |
1516 | de167e41 | bellard | { |
1517 | a046433a | bellard | if (cluster < s->last_cluster_of_root_directory) {
|
1518 | a046433a | bellard | if (cluster + 1 == s->last_cluster_of_root_directory) |
1519 | a046433a | bellard | return s->max_fat_value;
|
1520 | a046433a | bellard | else
|
1521 | a046433a | bellard | return cluster + 1; |
1522 | a046433a | bellard | } |
1523 | a046433a | bellard | |
1524 | a046433a | bellard | if (s->fat_type==32) { |
1525 | a046433a | bellard | uint32_t* entry=((uint32_t*)s->fat2)+cluster; |
1526 | a046433a | bellard | return le32_to_cpu(*entry);
|
1527 | a046433a | bellard | } else if (s->fat_type==16) { |
1528 | a046433a | bellard | uint16_t* entry=((uint16_t*)s->fat2)+cluster; |
1529 | a046433a | bellard | return le16_to_cpu(*entry);
|
1530 | a046433a | bellard | } else {
|
1531 | a046433a | bellard | const uint8_t* x=s->fat2+cluster*3/2; |
1532 | a046433a | bellard | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
1533 | a046433a | bellard | } |
1534 | a046433a | bellard | } |
1535 | a046433a | bellard | |
1536 | a046433a | bellard | static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) |
1537 | a046433a | bellard | { |
1538 | a046433a | bellard | int was_modified = 0; |
1539 | a046433a | bellard | int i, dummy;
|
1540 | a046433a | bellard | |
1541 | a046433a | bellard | if (s->qcow == NULL) |
1542 | de167e41 | bellard | return 0; |
1543 | a046433a | bellard | |
1544 | a046433a | bellard | for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) |
1545 | a046433a | bellard | was_modified = s->qcow->drv->bdrv_is_allocated(s->qcow, |
1546 | a046433a | bellard | cluster2sector(s, cluster_num) + i, 1, &dummy);
|
1547 | a046433a | bellard | |
1548 | a046433a | bellard | return was_modified;
|
1549 | de167e41 | bellard | } |
1550 | de167e41 | bellard | |
1551 | a046433a | bellard | static const char* get_basename(const char* path) |
1552 | de167e41 | bellard | { |
1553 | a046433a | bellard | char* basename = strrchr(path, '/'); |
1554 | a046433a | bellard | if (basename == NULL) |
1555 | a046433a | bellard | return path;
|
1556 | a046433a | bellard | else
|
1557 | a046433a | bellard | return basename + 1; /* strip '/' */ |
1558 | de167e41 | bellard | } |
1559 | de167e41 | bellard | |
1560 | a046433a | bellard | /*
|
1561 | a046433a | bellard | * The array s->used_clusters holds the states of the clusters. If it is
|
1562 | a046433a | bellard | * part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
1563 | a046433a | bellard | * was modified, bit 3 is set.
|
1564 | a046433a | bellard | * If any cluster is allocated, but not part of a file or directory, this
|
1565 | a046433a | bellard | * driver refuses to commit.
|
1566 | a046433a | bellard | */
|
1567 | a046433a | bellard | typedef enum { |
1568 | a046433a | bellard | USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 |
1569 | c227f099 | Anthony Liguori | } used_t; |
1570 | de167e41 | bellard | |
1571 | a046433a | bellard | /*
|
1572 | a046433a | bellard | * get_cluster_count_for_direntry() not only determines how many clusters
|
1573 | a046433a | bellard | * are occupied by direntry, but also if it was renamed or modified.
|
1574 | a046433a | bellard | *
|
1575 | a046433a | bellard | * A file is thought to be renamed *only* if there already was a file with
|
1576 | a046433a | bellard | * exactly the same first cluster, but a different name.
|
1577 | a046433a | bellard | *
|
1578 | a046433a | bellard | * Further, the files/directories handled by this function are
|
1579 | a046433a | bellard | * assumed to be *not* deleted (and *only* those).
|
1580 | a046433a | bellard | */
|
1581 | a046433a | bellard | static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
1582 | c227f099 | Anthony Liguori | direntry_t* direntry, const char* path) |
1583 | de167e41 | bellard | { |
1584 | a046433a | bellard | /*
|
1585 | a046433a | bellard | * This is a little bit tricky:
|
1586 | a046433a | bellard | * IF the guest OS just inserts a cluster into the file chain,
|
1587 | a046433a | bellard | * and leaves the rest alone, (i.e. the original file had clusters
|
1588 | a046433a | bellard | * 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
1589 | a046433a | bellard | *
|
1590 | a046433a | bellard | * - do_commit will write the cluster into the file at the given
|
1591 | a046433a | bellard | * offset, but
|
1592 | a046433a | bellard | *
|
1593 | a046433a | bellard | * - the cluster which is overwritten should be moved to a later
|
1594 | a046433a | bellard | * position in the file.
|
1595 | a046433a | bellard | *
|
1596 | a046433a | bellard | * I am not aware that any OS does something as braindead, but this
|
1597 | a046433a | bellard | * situation could happen anyway when not committing for a long time.
|
1598 | a046433a | bellard | * Just to be sure that this does not bite us, detect it, and copy the
|
1599 | a046433a | bellard | * contents of the clusters to-be-overwritten into the qcow.
|
1600 | a046433a | bellard | */
|
1601 | a046433a | bellard | int copy_it = 0; |
1602 | a046433a | bellard | int was_modified = 0; |
1603 | a046433a | bellard | int32_t ret = 0;
|
1604 | a046433a | bellard | |
1605 | a046433a | bellard | uint32_t cluster_num = begin_of_direntry(direntry); |
1606 | a046433a | bellard | uint32_t offset = 0;
|
1607 | a046433a | bellard | int first_mapping_index = -1; |
1608 | c227f099 | Anthony Liguori | mapping_t* mapping = NULL;
|
1609 | a046433a | bellard | const char* basename2 = NULL; |
1610 | de167e41 | bellard | |
1611 | a046433a | bellard | vvfat_close_current_file(s); |
1612 | de167e41 | bellard | |
1613 | a046433a | bellard | /* the root directory */
|
1614 | a046433a | bellard | if (cluster_num == 0) |
1615 | de167e41 | bellard | return 0; |
1616 | de167e41 | bellard | |
1617 | a046433a | bellard | /* write support */
|
1618 | a046433a | bellard | if (s->qcow) {
|
1619 | a046433a | bellard | basename2 = get_basename(path); |
1620 | de167e41 | bellard | |
1621 | a046433a | bellard | mapping = find_mapping_for_cluster(s, cluster_num); |
1622 | a046433a | bellard | |
1623 | a046433a | bellard | if (mapping) {
|
1624 | da2414e9 | bellard | const char* basename; |
1625 | da2414e9 | bellard | |
1626 | a046433a | bellard | assert(mapping->mode & MODE_DELETED); |
1627 | a046433a | bellard | mapping->mode &= ~MODE_DELETED; |
1628 | a046433a | bellard | |
1629 | da2414e9 | bellard | basename = get_basename(mapping->path); |
1630 | a046433a | bellard | |
1631 | a046433a | bellard | assert(mapping->mode & MODE_NORMAL); |
1632 | a046433a | bellard | |
1633 | a046433a | bellard | /* rename */
|
1634 | a046433a | bellard | if (strcmp(basename, basename2))
|
1635 | a046433a | bellard | schedule_rename(s, cluster_num, strdup(path)); |
1636 | a046433a | bellard | } else if (is_file(direntry)) |
1637 | a046433a | bellard | /* new file */
|
1638 | a046433a | bellard | schedule_new_file(s, strdup(path), cluster_num); |
1639 | a046433a | bellard | else {
|
1640 | a046433a | bellard | assert(0);
|
1641 | a046433a | bellard | return 0; |
1642 | a046433a | bellard | } |
1643 | de167e41 | bellard | } |
1644 | de167e41 | bellard | |
1645 | a046433a | bellard | while(1) { |
1646 | a046433a | bellard | if (s->qcow) {
|
1647 | a046433a | bellard | if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
1648 | a046433a | bellard | if (mapping == NULL || |
1649 | a046433a | bellard | mapping->begin > cluster_num || |
1650 | a046433a | bellard | mapping->end <= cluster_num) |
1651 | a046433a | bellard | mapping = find_mapping_for_cluster(s, cluster_num); |
1652 | de167e41 | bellard | |
1653 | a046433a | bellard | |
1654 | a046433a | bellard | if (mapping &&
|
1655 | a046433a | bellard | (mapping->mode & MODE_DIRECTORY) == 0) {
|
1656 | a046433a | bellard | |
1657 | a046433a | bellard | /* was modified in qcow */
|
1658 | a046433a | bellard | if (offset != mapping->info.file.offset + s->cluster_size
|
1659 | a046433a | bellard | * (cluster_num - mapping->begin)) { |
1660 | a046433a | bellard | /* offset of this cluster in file chain has changed */
|
1661 | a046433a | bellard | assert(0);
|
1662 | a046433a | bellard | copy_it = 1;
|
1663 | a046433a | bellard | } else if (offset == 0) { |
1664 | a046433a | bellard | const char* basename = get_basename(mapping->path); |
1665 | a046433a | bellard | |
1666 | a046433a | bellard | if (strcmp(basename, basename2))
|
1667 | a046433a | bellard | copy_it = 1;
|
1668 | a046433a | bellard | first_mapping_index = array_index(&(s->mapping), mapping); |
1669 | a046433a | bellard | } |
1670 | a046433a | bellard | |
1671 | a046433a | bellard | if (mapping->first_mapping_index != first_mapping_index
|
1672 | a046433a | bellard | && mapping->info.file.offset > 0) {
|
1673 | a046433a | bellard | assert(0);
|
1674 | a046433a | bellard | copy_it = 1;
|
1675 | a046433a | bellard | } |
1676 | a046433a | bellard | |
1677 | a046433a | bellard | /* need to write out? */
|
1678 | a046433a | bellard | if (!was_modified && is_file(direntry)) {
|
1679 | a046433a | bellard | was_modified = 1;
|
1680 | a046433a | bellard | schedule_writeout(s, mapping->dir_index, offset); |
1681 | a046433a | bellard | } |
1682 | a046433a | bellard | } |
1683 | a046433a | bellard | } |
1684 | a046433a | bellard | |
1685 | a046433a | bellard | if (copy_it) {
|
1686 | a046433a | bellard | int i, dummy;
|
1687 | a046433a | bellard | /*
|
1688 | a046433a | bellard | * This is horribly inefficient, but that is okay, since
|
1689 | a046433a | bellard | * it is rarely executed, if at all.
|
1690 | a046433a | bellard | */
|
1691 | a046433a | bellard | int64_t offset = cluster2sector(s, cluster_num); |
1692 | a046433a | bellard | |
1693 | a046433a | bellard | vvfat_close_current_file(s); |
1694 | a046433a | bellard | for (i = 0; i < s->sectors_per_cluster; i++) |
1695 | a046433a | bellard | if (!s->qcow->drv->bdrv_is_allocated(s->qcow,
|
1696 | a046433a | bellard | offset + i, 1, &dummy)) {
|
1697 | a046433a | bellard | if (vvfat_read(s->bs,
|
1698 | a046433a | bellard | offset, s->cluster_buffer, 1))
|
1699 | a046433a | bellard | return -1; |
1700 | a046433a | bellard | if (s->qcow->drv->bdrv_write(s->qcow,
|
1701 | a046433a | bellard | offset, s->cluster_buffer, 1))
|
1702 | a046433a | bellard | return -2; |
1703 | a046433a | bellard | } |
1704 | a046433a | bellard | } |
1705 | a046433a | bellard | } |
1706 | a046433a | bellard | |
1707 | a046433a | bellard | ret++; |
1708 | a046433a | bellard | if (s->used_clusters[cluster_num] & USED_ANY)
|
1709 | a046433a | bellard | return 0; |
1710 | a046433a | bellard | s->used_clusters[cluster_num] = USED_FILE; |
1711 | a046433a | bellard | |
1712 | a046433a | bellard | cluster_num = modified_fat_get(s, cluster_num); |
1713 | a046433a | bellard | |
1714 | a046433a | bellard | if (fat_eof(s, cluster_num))
|
1715 | a046433a | bellard | return ret;
|
1716 | a046433a | bellard | else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) |
1717 | a046433a | bellard | return -1; |
1718 | a046433a | bellard | |
1719 | a046433a | bellard | offset += s->cluster_size; |
1720 | a046433a | bellard | } |
1721 | de167e41 | bellard | } |
1722 | de167e41 | bellard | |
1723 | a046433a | bellard | /*
|
1724 | 5fafdf24 | ths | * This function looks at the modified data (qcow).
|
1725 | a046433a | bellard | * It returns 0 upon inconsistency or error, and the number of clusters
|
1726 | a046433a | bellard | * used by the directory, its subdirectories and their files.
|
1727 | a046433a | bellard | */
|
1728 | a046433a | bellard | static int check_directory_consistency(BDRVVVFATState *s, |
1729 | a046433a | bellard | int cluster_num, const char* path) |
1730 | de167e41 | bellard | { |
1731 | a046433a | bellard | int ret = 0; |
1732 | 3ec88e80 | aliguori | unsigned char* cluster = qemu_malloc(s->cluster_size); |
1733 | c227f099 | Anthony Liguori | direntry_t* direntries = (direntry_t*)cluster; |
1734 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); |
1735 | a046433a | bellard | |
1736 | a046433a | bellard | long_file_name lfn; |
1737 | a046433a | bellard | int path_len = strlen(path);
|
1738 | a046433a | bellard | char path2[PATH_MAX];
|
1739 | a046433a | bellard | |
1740 | a046433a | bellard | assert(path_len < PATH_MAX); /* len was tested before! */
|
1741 | 363a37d5 | blueswir1 | pstrcpy(path2, sizeof(path2), path);
|
1742 | a046433a | bellard | path2[path_len] = '/';
|
1743 | a046433a | bellard | path2[path_len + 1] = '\0'; |
1744 | a046433a | bellard | |
1745 | a046433a | bellard | if (mapping) {
|
1746 | a046433a | bellard | const char* basename = get_basename(mapping->path); |
1747 | a046433a | bellard | const char* basename2 = get_basename(path); |
1748 | a046433a | bellard | |
1749 | a046433a | bellard | assert(mapping->mode & MODE_DIRECTORY); |
1750 | a046433a | bellard | |
1751 | a046433a | bellard | assert(mapping->mode & MODE_DELETED); |
1752 | a046433a | bellard | mapping->mode &= ~MODE_DELETED; |
1753 | a046433a | bellard | |
1754 | a046433a | bellard | if (strcmp(basename, basename2))
|
1755 | a046433a | bellard | schedule_rename(s, cluster_num, strdup(path)); |
1756 | a046433a | bellard | } else
|
1757 | a046433a | bellard | /* new directory */
|
1758 | a046433a | bellard | schedule_mkdir(s, cluster_num, strdup(path)); |
1759 | 3b46e624 | ths | |
1760 | a046433a | bellard | lfn_init(&lfn); |
1761 | a046433a | bellard | do {
|
1762 | de167e41 | bellard | int i;
|
1763 | a046433a | bellard | int subret = 0; |
1764 | a046433a | bellard | |
1765 | a046433a | bellard | ret++; |
1766 | a046433a | bellard | |
1767 | a046433a | bellard | if (s->used_clusters[cluster_num] & USED_ANY) {
|
1768 | a046433a | bellard | fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); |
1769 | a046433a | bellard | return 0; |
1770 | a046433a | bellard | } |
1771 | a046433a | bellard | s->used_clusters[cluster_num] = USED_DIRECTORY; |
1772 | a046433a | bellard | |
1773 | a046433a | bellard | DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); |
1774 | a046433a | bellard | subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, |
1775 | a046433a | bellard | s->sectors_per_cluster); |
1776 | a046433a | bellard | if (subret) {
|
1777 | a046433a | bellard | fprintf(stderr, "Error fetching direntries\n");
|
1778 | a046433a | bellard | fail:
|
1779 | a046433a | bellard | free(cluster); |
1780 | a046433a | bellard | return 0; |
1781 | a046433a | bellard | } |
1782 | a046433a | bellard | |
1783 | a046433a | bellard | for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { |
1784 | 3f4cb3d3 | blueswir1 | int cluster_count = 0; |
1785 | a046433a | bellard | |
1786 | a046433a | bellard | DLOG(fprintf(stderr, "check direntry %d: \n", i); print_direntry(direntries + i));
|
1787 | a046433a | bellard | if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
1788 | a046433a | bellard | is_free(direntries + i)) |
1789 | a046433a | bellard | continue;
|
1790 | a046433a | bellard | |
1791 | a046433a | bellard | subret = parse_long_name(&lfn, direntries + i); |
1792 | a046433a | bellard | if (subret < 0) { |
1793 | a046433a | bellard | fprintf(stderr, "Error in long name\n");
|
1794 | a046433a | bellard | goto fail;
|
1795 | de167e41 | bellard | } |
1796 | a046433a | bellard | if (subret == 0 || is_free(direntries + i)) |
1797 | a046433a | bellard | continue;
|
1798 | a046433a | bellard | |
1799 | a046433a | bellard | if (fat_chksum(direntries+i) != lfn.checksum) {
|
1800 | a046433a | bellard | subret = parse_short_name(s, &lfn, direntries + i); |
1801 | a046433a | bellard | if (subret < 0) { |
1802 | a046433a | bellard | fprintf(stderr, "Error in short name (%d)\n", subret);
|
1803 | a046433a | bellard | goto fail;
|
1804 | a046433a | bellard | } |
1805 | ffe8ab83 | ths | if (subret > 0 || !strcmp((char*)lfn.name, ".") |
1806 | ffe8ab83 | ths | || !strcmp((char*)lfn.name, "..")) |
1807 | a046433a | bellard | continue;
|
1808 | a046433a | bellard | } |
1809 | a046433a | bellard | lfn.checksum = 0x100; /* cannot use long name twice */ |
1810 | a046433a | bellard | |
1811 | a046433a | bellard | if (path_len + 1 + lfn.len >= PATH_MAX) { |
1812 | a046433a | bellard | fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
1813 | a046433a | bellard | goto fail;
|
1814 | a046433a | bellard | } |
1815 | 363a37d5 | blueswir1 | pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1, |
1816 | 363a37d5 | blueswir1 | (char*)lfn.name);
|
1817 | a046433a | bellard | |
1818 | a046433a | bellard | if (is_directory(direntries + i)) {
|
1819 | a046433a | bellard | if (begin_of_direntry(direntries + i) == 0) { |
1820 | a046433a | bellard | DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
1821 | a046433a | bellard | goto fail;
|
1822 | a046433a | bellard | } |
1823 | a046433a | bellard | cluster_count = check_directory_consistency(s, |
1824 | a046433a | bellard | begin_of_direntry(direntries + i), path2); |
1825 | a046433a | bellard | if (cluster_count == 0) { |
1826 | a046433a | bellard | DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
1827 | a046433a | bellard | goto fail;
|
1828 | a046433a | bellard | } |
1829 | a046433a | bellard | } else if (is_file(direntries + i)) { |
1830 | a046433a | bellard | /* check file size with FAT */
|
1831 | a046433a | bellard | cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); |
1832 | a046433a | bellard | if (cluster_count !=
|
1833 | a046433a | bellard | (le32_to_cpu(direntries[i].size) + s->cluster_size |
1834 | a046433a | bellard | - 1) / s->cluster_size) {
|
1835 | a046433a | bellard | DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
1836 | a046433a | bellard | goto fail;
|
1837 | a046433a | bellard | } |
1838 | a046433a | bellard | } else
|
1839 | a046433a | bellard | assert(0); /* cluster_count = 0; */ |
1840 | a046433a | bellard | |
1841 | a046433a | bellard | ret += cluster_count; |
1842 | de167e41 | bellard | } |
1843 | de167e41 | bellard | |
1844 | a046433a | bellard | cluster_num = modified_fat_get(s, cluster_num); |
1845 | a046433a | bellard | } while(!fat_eof(s, cluster_num));
|
1846 | de167e41 | bellard | |
1847 | a046433a | bellard | free(cluster); |
1848 | a046433a | bellard | return ret;
|
1849 | a046433a | bellard | } |
1850 | a046433a | bellard | |
1851 | a046433a | bellard | /* returns 1 on success */
|
1852 | a046433a | bellard | static int is_consistent(BDRVVVFATState* s) |
1853 | a046433a | bellard | { |
1854 | a046433a | bellard | int i, check;
|
1855 | a046433a | bellard | int used_clusters_count = 0; |
1856 | a046433a | bellard | |
1857 | a046433a | bellard | DLOG(checkpoint()); |
1858 | a046433a | bellard | /*
|
1859 | a046433a | bellard | * - get modified FAT
|
1860 | a046433a | bellard | * - compare the two FATs (TODO)
|
1861 | a046433a | bellard | * - get buffer for marking used clusters
|
1862 | a046433a | bellard | * - recurse direntries from root (using bs->bdrv_read to make
|
1863 | a046433a | bellard | * sure to get the new data)
|
1864 | a046433a | bellard | * - check that the FAT agrees with the size
|
1865 | a046433a | bellard | * - count the number of clusters occupied by this directory and
|
1866 | a046433a | bellard | * its files
|
1867 | a046433a | bellard | * - check that the cumulative used cluster count agrees with the
|
1868 | a046433a | bellard | * FAT
|
1869 | a046433a | bellard | * - if all is fine, return number of used clusters
|
1870 | a046433a | bellard | */
|
1871 | a046433a | bellard | if (s->fat2 == NULL) { |
1872 | a046433a | bellard | int size = 0x200 * s->sectors_per_fat; |
1873 | 3ec88e80 | aliguori | s->fat2 = qemu_malloc(size); |
1874 | a046433a | bellard | memcpy(s->fat2, s->fat.pointer, size); |
1875 | a046433a | bellard | } |
1876 | a046433a | bellard | check = vvfat_read(s->bs, |
1877 | a046433a | bellard | s->first_sectors_number, s->fat2, s->sectors_per_fat); |
1878 | a046433a | bellard | if (check) {
|
1879 | a046433a | bellard | fprintf(stderr, "Could not copy fat\n");
|
1880 | a046433a | bellard | return 0; |
1881 | a046433a | bellard | } |
1882 | a046433a | bellard | assert (s->used_clusters); |
1883 | a046433a | bellard | for (i = 0; i < sector2cluster(s, s->sector_count); i++) |
1884 | a046433a | bellard | s->used_clusters[i] &= ~USED_ANY; |
1885 | a046433a | bellard | |
1886 | a046433a | bellard | clear_commits(s); |
1887 | a046433a | bellard | |
1888 | a046433a | bellard | /* mark every mapped file/directory as deleted.
|
1889 | a046433a | bellard | * (check_directory_consistency() will unmark those still present). */
|
1890 | a046433a | bellard | if (s->qcow)
|
1891 | a046433a | bellard | for (i = 0; i < s->mapping.next; i++) { |
1892 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
1893 | a046433a | bellard | if (mapping->first_mapping_index < 0) |
1894 | a046433a | bellard | mapping->mode |= MODE_DELETED; |
1895 | de167e41 | bellard | } |
1896 | a046433a | bellard | |
1897 | a046433a | bellard | used_clusters_count = check_directory_consistency(s, 0, s->path);
|
1898 | a046433a | bellard | if (used_clusters_count <= 0) { |
1899 | a046433a | bellard | DLOG(fprintf(stderr, "problem in directory\n"));
|
1900 | a046433a | bellard | return 0; |
1901 | de167e41 | bellard | } |
1902 | de167e41 | bellard | |
1903 | a046433a | bellard | check = s->last_cluster_of_root_directory; |
1904 | a046433a | bellard | for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
1905 | a046433a | bellard | if (modified_fat_get(s, i)) {
|
1906 | a046433a | bellard | if(!s->used_clusters[i]) {
|
1907 | a046433a | bellard | DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
1908 | a046433a | bellard | return 0; |
1909 | a046433a | bellard | } |
1910 | a046433a | bellard | check++; |
1911 | a046433a | bellard | } |
1912 | a046433a | bellard | |
1913 | a046433a | bellard | if (s->used_clusters[i] == USED_ALLOCATED) {
|
1914 | a046433a | bellard | /* allocated, but not used... */
|
1915 | a046433a | bellard | DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
1916 | a046433a | bellard | return 0; |
1917 | a046433a | bellard | } |
1918 | a046433a | bellard | } |
1919 | a046433a | bellard | |
1920 | a046433a | bellard | if (check != used_clusters_count)
|
1921 | a046433a | bellard | return 0; |
1922 | a046433a | bellard | |
1923 | a046433a | bellard | return used_clusters_count;
|
1924 | a046433a | bellard | } |
1925 | a046433a | bellard | |
1926 | a046433a | bellard | static inline void adjust_mapping_indices(BDRVVVFATState* s, |
1927 | a046433a | bellard | int offset, int adjust) |
1928 | a046433a | bellard | { |
1929 | a046433a | bellard | int i;
|
1930 | a046433a | bellard | |
1931 | a046433a | bellard | for (i = 0; i < s->mapping.next; i++) { |
1932 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
1933 | a046433a | bellard | |
1934 | a046433a | bellard | #define ADJUST_MAPPING_INDEX(name) \
|
1935 | a046433a | bellard | if (mapping->name >= offset) \
|
1936 | a046433a | bellard | mapping->name += adjust |
1937 | a046433a | bellard | |
1938 | a046433a | bellard | ADJUST_MAPPING_INDEX(first_mapping_index); |
1939 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY)
|
1940 | a046433a | bellard | ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); |
1941 | de167e41 | bellard | } |
1942 | a046433a | bellard | } |
1943 | a046433a | bellard | |
1944 | a046433a | bellard | /* insert or update mapping */
|
1945 | c227f099 | Anthony Liguori | static mapping_t* insert_mapping(BDRVVVFATState* s,
|
1946 | a046433a | bellard | uint32_t begin, uint32_t end) |
1947 | a046433a | bellard | { |
1948 | a046433a | bellard | /*
|
1949 | a046433a | bellard | * - find mapping where mapping->begin >= begin,
|
1950 | a046433a | bellard | * - if mapping->begin > begin: insert
|
1951 | a046433a | bellard | * - adjust all references to mappings!
|
1952 | a046433a | bellard | * - else: adjust
|
1953 | a046433a | bellard | * - replace name
|
1954 | a046433a | bellard | */
|
1955 | a046433a | bellard | int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); |
1956 | c227f099 | Anthony Liguori | mapping_t* mapping = NULL;
|
1957 | c227f099 | Anthony Liguori | mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
1958 | a046433a | bellard | |
1959 | a046433a | bellard | if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
1960 | a046433a | bellard | && mapping->begin < begin) { |
1961 | a046433a | bellard | mapping->end = begin; |
1962 | a046433a | bellard | index++; |
1963 | a046433a | bellard | mapping = array_get(&(s->mapping), index); |
1964 | a046433a | bellard | } |
1965 | a046433a | bellard | if (index >= s->mapping.next || mapping->begin > begin) {
|
1966 | a046433a | bellard | mapping = array_insert(&(s->mapping), index, 1);
|
1967 | a046433a | bellard | mapping->path = NULL;
|
1968 | a046433a | bellard | adjust_mapping_indices(s, index, +1);
|
1969 | a046433a | bellard | } |
1970 | a046433a | bellard | |
1971 | a046433a | bellard | mapping->begin = begin; |
1972 | a046433a | bellard | mapping->end = end; |
1973 | de167e41 | bellard | |
1974 | c227f099 | Anthony Liguori | DLOG(mapping_t* next_mapping; |
1975 | a046433a | bellard | assert(index + 1 >= s->mapping.next ||
|
1976 | a046433a | bellard | ((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
1977 | a046433a | bellard | next_mapping->begin >= end))); |
1978 | a046433a | bellard | |
1979 | c227f099 | Anthony Liguori | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
1980 | a046433a | bellard | s->current_mapping = array_get(&(s->mapping), |
1981 | a046433a | bellard | s->current_mapping - first_mapping); |
1982 | a046433a | bellard | |
1983 | a046433a | bellard | return mapping;
|
1984 | a046433a | bellard | } |
1985 | a046433a | bellard | |
1986 | a046433a | bellard | static int remove_mapping(BDRVVVFATState* s, int mapping_index) |
1987 | a046433a | bellard | { |
1988 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
1989 | c227f099 | Anthony Liguori | mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
1990 | a046433a | bellard | |
1991 | a046433a | bellard | /* free mapping */
|
1992 | a046433a | bellard | if (mapping->first_mapping_index < 0) |
1993 | a046433a | bellard | free(mapping->path); |
1994 | a046433a | bellard | |
1995 | a046433a | bellard | /* remove from s->mapping */
|
1996 | a046433a | bellard | array_remove(&(s->mapping), mapping_index); |
1997 | a046433a | bellard | |
1998 | a046433a | bellard | /* adjust all references to mappings */
|
1999 | a046433a | bellard | adjust_mapping_indices(s, mapping_index, -1);
|
2000 | a046433a | bellard | |
2001 | c227f099 | Anthony Liguori | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
2002 | a046433a | bellard | s->current_mapping = array_get(&(s->mapping), |
2003 | a046433a | bellard | s->current_mapping - first_mapping); |
2004 | de167e41 | bellard | |
2005 | de167e41 | bellard | return 0; |
2006 | de167e41 | bellard | } |
2007 | de167e41 | bellard | |
2008 | a046433a | bellard | static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
2009 | a046433a | bellard | { |
2010 | a046433a | bellard | int i;
|
2011 | a046433a | bellard | for (i = 0; i < s->mapping.next; i++) { |
2012 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
2013 | a046433a | bellard | if (mapping->dir_index >= offset)
|
2014 | a046433a | bellard | mapping->dir_index += adjust; |
2015 | a046433a | bellard | if ((mapping->mode & MODE_DIRECTORY) &&
|
2016 | a046433a | bellard | mapping->info.dir.first_dir_index >= offset) |
2017 | a046433a | bellard | mapping->info.dir.first_dir_index += adjust; |
2018 | a046433a | bellard | } |
2019 | a046433a | bellard | } |
2020 | de167e41 | bellard | |
2021 | c227f099 | Anthony Liguori | static direntry_t* insert_direntries(BDRVVVFATState* s,
|
2022 | a046433a | bellard | int dir_index, int count) |
2023 | de167e41 | bellard | { |
2024 | a046433a | bellard | /*
|
2025 | a046433a | bellard | * make room in s->directory,
|
2026 | a046433a | bellard | * adjust_dirindices
|
2027 | a046433a | bellard | */
|
2028 | c227f099 | Anthony Liguori | direntry_t* result = array_insert(&(s->directory), dir_index, count); |
2029 | a046433a | bellard | if (result == NULL) |
2030 | a046433a | bellard | return NULL; |
2031 | a046433a | bellard | adjust_dirindices(s, dir_index, count); |
2032 | de167e41 | bellard | return result;
|
2033 | de167e41 | bellard | } |
2034 | de167e41 | bellard | |
2035 | a046433a | bellard | static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
2036 | a046433a | bellard | { |
2037 | a046433a | bellard | int ret = array_remove_slice(&(s->directory), dir_index, count);
|
2038 | a046433a | bellard | if (ret)
|
2039 | a046433a | bellard | return ret;
|
2040 | a046433a | bellard | adjust_dirindices(s, dir_index, -count); |
2041 | a046433a | bellard | return 0; |
2042 | a046433a | bellard | } |
2043 | de167e41 | bellard | |
2044 | a046433a | bellard | /*
|
2045 | a046433a | bellard | * Adapt the mappings of the cluster chain starting at first cluster
|
2046 | a046433a | bellard | * (i.e. if a file starts at first_cluster, the chain is followed according
|
2047 | a046433a | bellard | * to the modified fat, and the corresponding entries in s->mapping are
|
2048 | a046433a | bellard | * adjusted)
|
2049 | a046433a | bellard | */
|
2050 | a046433a | bellard | static int commit_mappings(BDRVVVFATState* s, |
2051 | a046433a | bellard | uint32_t first_cluster, int dir_index)
|
2052 | de167e41 | bellard | { |
2053 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2054 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), dir_index); |
2055 | a046433a | bellard | uint32_t cluster = first_cluster; |
2056 | a046433a | bellard | |
2057 | a046433a | bellard | vvfat_close_current_file(s); |
2058 | a046433a | bellard | |
2059 | a046433a | bellard | assert(mapping); |
2060 | a046433a | bellard | assert(mapping->begin == first_cluster); |
2061 | a046433a | bellard | mapping->first_mapping_index = -1;
|
2062 | a046433a | bellard | mapping->dir_index = dir_index; |
2063 | a046433a | bellard | mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
2064 | a046433a | bellard | MODE_DIRECTORY : MODE_NORMAL; |
2065 | a046433a | bellard | |
2066 | a046433a | bellard | while (!fat_eof(s, cluster)) {
|
2067 | a046433a | bellard | uint32_t c, c1; |
2068 | a046433a | bellard | |
2069 | a046433a | bellard | for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; |
2070 | a046433a | bellard | c = c1, c1 = modified_fat_get(s, c1)); |
2071 | a046433a | bellard | |
2072 | a046433a | bellard | c++; |
2073 | a046433a | bellard | if (c > mapping->end) {
|
2074 | a046433a | bellard | int index = array_index(&(s->mapping), mapping);
|
2075 | a046433a | bellard | int i, max_i = s->mapping.next - index;
|
2076 | a046433a | bellard | for (i = 1; i < max_i && mapping[i].begin < c; i++); |
2077 | a046433a | bellard | while (--i > 0) |
2078 | a046433a | bellard | remove_mapping(s, index + 1);
|
2079 | a046433a | bellard | } |
2080 | a046433a | bellard | assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
2081 | a046433a | bellard | || mapping[1].begin >= c);
|
2082 | a046433a | bellard | mapping->end = c; |
2083 | a046433a | bellard | |
2084 | a046433a | bellard | if (!fat_eof(s, c1)) {
|
2085 | a046433a | bellard | int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); |
2086 | c227f099 | Anthony Liguori | mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
2087 | a046433a | bellard | array_get(&(s->mapping), i); |
2088 | a046433a | bellard | |
2089 | a046433a | bellard | if (next_mapping == NULL || next_mapping->begin > c1) { |
2090 | a046433a | bellard | int i1 = array_index(&(s->mapping), mapping);
|
2091 | a046433a | bellard | |
2092 | a046433a | bellard | next_mapping = insert_mapping(s, c1, c1+1);
|
2093 | a046433a | bellard | |
2094 | a046433a | bellard | if (c1 < c)
|
2095 | a046433a | bellard | i1++; |
2096 | a046433a | bellard | mapping = array_get(&(s->mapping), i1); |
2097 | a046433a | bellard | } |
2098 | a046433a | bellard | |
2099 | a046433a | bellard | next_mapping->dir_index = mapping->dir_index; |
2100 | 5fafdf24 | ths | next_mapping->first_mapping_index = |
2101 | a046433a | bellard | mapping->first_mapping_index < 0 ?
|
2102 | a046433a | bellard | array_index(&(s->mapping), mapping) : |
2103 | a046433a | bellard | mapping->first_mapping_index; |
2104 | a046433a | bellard | next_mapping->path = mapping->path; |
2105 | a046433a | bellard | next_mapping->mode = mapping->mode; |
2106 | a046433a | bellard | next_mapping->read_only = mapping->read_only; |
2107 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2108 | a046433a | bellard | next_mapping->info.dir.parent_mapping_index = |
2109 | a046433a | bellard | mapping->info.dir.parent_mapping_index; |
2110 | a046433a | bellard | next_mapping->info.dir.first_dir_index = |
2111 | a046433a | bellard | mapping->info.dir.first_dir_index + |
2112 | a046433a | bellard | 0x10 * s->sectors_per_cluster *
|
2113 | a046433a | bellard | (mapping->end - mapping->begin); |
2114 | a046433a | bellard | } else
|
2115 | a046433a | bellard | next_mapping->info.file.offset = mapping->info.file.offset + |
2116 | a046433a | bellard | mapping->end - mapping->begin; |
2117 | a046433a | bellard | |
2118 | a046433a | bellard | mapping = next_mapping; |
2119 | a046433a | bellard | } |
2120 | 3b46e624 | ths | |
2121 | a046433a | bellard | cluster = c1; |
2122 | a046433a | bellard | } |
2123 | de167e41 | bellard | |
2124 | de167e41 | bellard | return 0; |
2125 | de167e41 | bellard | } |
2126 | de167e41 | bellard | |
2127 | a046433a | bellard | static int commit_direntries(BDRVVVFATState* s, |
2128 | a046433a | bellard | int dir_index, int parent_mapping_index) |
2129 | de167e41 | bellard | { |
2130 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), dir_index); |
2131 | a046433a | bellard | uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
2132 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2133 | a046433a | bellard | |
2134 | a046433a | bellard | int factor = 0x10 * s->sectors_per_cluster; |
2135 | a046433a | bellard | int old_cluster_count, new_cluster_count;
|
2136 | a046433a | bellard | int current_dir_index = mapping->info.dir.first_dir_index;
|
2137 | a046433a | bellard | int first_dir_index = current_dir_index;
|
2138 | a046433a | bellard | int ret, i;
|
2139 | a046433a | bellard | uint32_t c; |
2140 | a046433a | bellard | |
2141 | a046433a | bellard | DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
2142 | a046433a | bellard | |
2143 | a046433a | bellard | assert(direntry); |
2144 | a046433a | bellard | assert(mapping); |
2145 | a046433a | bellard | assert(mapping->begin == first_cluster); |
2146 | a046433a | bellard | assert(mapping->info.dir.first_dir_index < s->directory.next); |
2147 | a046433a | bellard | assert(mapping->mode & MODE_DIRECTORY); |
2148 | a046433a | bellard | assert(dir_index == 0 || is_directory(direntry));
|
2149 | a046433a | bellard | |
2150 | a046433a | bellard | mapping->info.dir.parent_mapping_index = parent_mapping_index; |
2151 | a046433a | bellard | |
2152 | a046433a | bellard | if (first_cluster == 0) { |
2153 | a046433a | bellard | old_cluster_count = new_cluster_count = |
2154 | a046433a | bellard | s->last_cluster_of_root_directory; |
2155 | a046433a | bellard | } else {
|
2156 | a046433a | bellard | for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2157 | a046433a | bellard | c = fat_get(s, c)) |
2158 | a046433a | bellard | old_cluster_count++; |
2159 | de167e41 | bellard | |
2160 | a046433a | bellard | for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2161 | a046433a | bellard | c = modified_fat_get(s, c)) |
2162 | a046433a | bellard | new_cluster_count++; |
2163 | a046433a | bellard | } |
2164 | de167e41 | bellard | |
2165 | a046433a | bellard | if (new_cluster_count > old_cluster_count) {
|
2166 | a046433a | bellard | if (insert_direntries(s,
|
2167 | a046433a | bellard | current_dir_index + factor * old_cluster_count, |
2168 | a046433a | bellard | factor * (new_cluster_count - old_cluster_count)) == NULL)
|
2169 | a046433a | bellard | return -1; |
2170 | a046433a | bellard | } else if (new_cluster_count < old_cluster_count) |
2171 | a046433a | bellard | remove_direntries(s, |
2172 | a046433a | bellard | current_dir_index + factor * new_cluster_count, |
2173 | a046433a | bellard | factor * (old_cluster_count - new_cluster_count)); |
2174 | a046433a | bellard | |
2175 | a046433a | bellard | for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
2176 | a046433a | bellard | void* direntry = array_get(&(s->directory), current_dir_index);
|
2177 | a046433a | bellard | int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
2178 | a046433a | bellard | s->sectors_per_cluster); |
2179 | a046433a | bellard | if (ret)
|
2180 | a046433a | bellard | return ret;
|
2181 | a046433a | bellard | assert(!strncmp(s->directory.pointer, "QEMU", 4)); |
2182 | a046433a | bellard | current_dir_index += factor; |
2183 | a046433a | bellard | } |
2184 | de167e41 | bellard | |
2185 | a046433a | bellard | ret = commit_mappings(s, first_cluster, dir_index); |
2186 | a046433a | bellard | if (ret)
|
2187 | a046433a | bellard | return ret;
|
2188 | a046433a | bellard | |
2189 | a046433a | bellard | /* recurse */
|
2190 | a046433a | bellard | for (i = 0; i < factor * new_cluster_count; i++) { |
2191 | a046433a | bellard | direntry = array_get(&(s->directory), first_dir_index + i); |
2192 | a046433a | bellard | if (is_directory(direntry) && !is_dot(direntry)) {
|
2193 | a046433a | bellard | mapping = find_mapping_for_cluster(s, first_cluster); |
2194 | a046433a | bellard | assert(mapping->mode & MODE_DIRECTORY); |
2195 | a046433a | bellard | ret = commit_direntries(s, first_dir_index + i, |
2196 | a046433a | bellard | array_index(&(s->mapping), mapping)); |
2197 | a046433a | bellard | if (ret)
|
2198 | a046433a | bellard | return ret;
|
2199 | a046433a | bellard | } |
2200 | a046433a | bellard | } |
2201 | de167e41 | bellard | |
2202 | a046433a | bellard | return 0; |
2203 | a046433a | bellard | } |
2204 | de167e41 | bellard | |
2205 | a046433a | bellard | /* commit one file (adjust contents, adjust mapping),
|
2206 | a046433a | bellard | return first_mapping_index */
|
2207 | a046433a | bellard | static int commit_one_file(BDRVVVFATState* s, |
2208 | a046433a | bellard | int dir_index, uint32_t offset)
|
2209 | a046433a | bellard | { |
2210 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), dir_index); |
2211 | a046433a | bellard | uint32_t c = begin_of_direntry(direntry); |
2212 | a046433a | bellard | uint32_t first_cluster = c; |
2213 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, c); |
2214 | a046433a | bellard | uint32_t size = filesize_of_direntry(direntry); |
2215 | 3ec88e80 | aliguori | char* cluster = qemu_malloc(s->cluster_size);
|
2216 | a046433a | bellard | uint32_t i; |
2217 | a046433a | bellard | int fd = 0; |
2218 | a046433a | bellard | |
2219 | a046433a | bellard | assert(offset < size); |
2220 | a046433a | bellard | assert((offset % s->cluster_size) == 0);
|
2221 | a046433a | bellard | |
2222 | a046433a | bellard | for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
2223 | a046433a | bellard | c = modified_fat_get(s, c); |
2224 | a046433a | bellard | |
2225 | 6bcb76c3 | bellard | fd = open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
|
2226 | a046433a | bellard | if (fd < 0) { |
2227 | a046433a | bellard | fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
2228 | a046433a | bellard | strerror(errno), errno); |
2229 | a046433a | bellard | return fd;
|
2230 | de167e41 | bellard | } |
2231 | a046433a | bellard | if (offset > 0) |
2232 | a046433a | bellard | if (lseek(fd, offset, SEEK_SET) != offset)
|
2233 | a046433a | bellard | return -3; |
2234 | a046433a | bellard | |
2235 | a046433a | bellard | while (offset < size) {
|
2236 | a046433a | bellard | uint32_t c1; |
2237 | a046433a | bellard | int rest_size = (size - offset > s->cluster_size ?
|
2238 | a046433a | bellard | s->cluster_size : size - offset); |
2239 | a046433a | bellard | int ret;
|
2240 | a046433a | bellard | |
2241 | a046433a | bellard | c1 = modified_fat_get(s, c); |
2242 | a046433a | bellard | |
2243 | a046433a | bellard | assert((size - offset == 0 && fat_eof(s, c)) ||
|
2244 | a046433a | bellard | (size > offset && c >=2 && !fat_eof(s, c)));
|
2245 | a046433a | bellard | |
2246 | a046433a | bellard | ret = vvfat_read(s->bs, cluster2sector(s, c), |
2247 | ffe8ab83 | ths | (uint8_t*)cluster, (rest_size + 0x1ff) / 0x200); |
2248 | a046433a | bellard | |
2249 | a046433a | bellard | if (ret < 0) |
2250 | a046433a | bellard | return ret;
|
2251 | a046433a | bellard | |
2252 | a046433a | bellard | if (write(fd, cluster, rest_size) < 0) |
2253 | a046433a | bellard | return -2; |
2254 | a046433a | bellard | |
2255 | a046433a | bellard | offset += rest_size; |
2256 | a046433a | bellard | c = c1; |
2257 | a046433a | bellard | } |
2258 | a046433a | bellard | |
2259 | a046433a | bellard | ftruncate(fd, size); |
2260 | a046433a | bellard | close(fd); |
2261 | a046433a | bellard | |
2262 | a046433a | bellard | return commit_mappings(s, first_cluster, dir_index);
|
2263 | a046433a | bellard | } |
2264 | a046433a | bellard | |
2265 | a046433a | bellard | #ifdef DEBUG
|
2266 | a046433a | bellard | /* test, if all mappings point to valid direntries */
|
2267 | a046433a | bellard | static void check1(BDRVVVFATState* s) |
2268 | a046433a | bellard | { |
2269 | a046433a | bellard | int i;
|
2270 | a046433a | bellard | for (i = 0; i < s->mapping.next; i++) { |
2271 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
2272 | a046433a | bellard | if (mapping->mode & MODE_DELETED) {
|
2273 | a046433a | bellard | fprintf(stderr, "deleted\n");
|
2274 | a046433a | bellard | continue;
|
2275 | a046433a | bellard | } |
2276 | a046433a | bellard | assert(mapping->dir_index >= 0);
|
2277 | a046433a | bellard | assert(mapping->dir_index < s->directory.next); |
2278 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
2279 | a046433a | bellard | assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
2280 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2281 | a046433a | bellard | assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
2282 | a046433a | bellard | assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); |
2283 | de167e41 | bellard | } |
2284 | de167e41 | bellard | } |
2285 | de167e41 | bellard | } |
2286 | de167e41 | bellard | |
2287 | a046433a | bellard | /* test, if all direntries have mappings */
|
2288 | a046433a | bellard | static void check2(BDRVVVFATState* s) |
2289 | de167e41 | bellard | { |
2290 | de167e41 | bellard | int i;
|
2291 | a046433a | bellard | int first_mapping = -1; |
2292 | de167e41 | bellard | |
2293 | a046433a | bellard | for (i = 0; i < s->directory.next; i++) { |
2294 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), i); |
2295 | de167e41 | bellard | |
2296 | a046433a | bellard | if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
2297 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
2298 | a046433a | bellard | assert(mapping); |
2299 | a046433a | bellard | assert(mapping->dir_index == i || is_dot(direntry)); |
2300 | a046433a | bellard | assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); |
2301 | a046433a | bellard | } |
2302 | de167e41 | bellard | |
2303 | a046433a | bellard | if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
2304 | a046433a | bellard | /* cluster start */
|
2305 | a046433a | bellard | int j, count = 0; |
2306 | de167e41 | bellard | |
2307 | a046433a | bellard | for (j = 0; j < s->mapping.next; j++) { |
2308 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), j); |
2309 | a046433a | bellard | if (mapping->mode & MODE_DELETED)
|
2310 | de167e41 | bellard | continue;
|
2311 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2312 | a046433a | bellard | if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { |
2313 | a046433a | bellard | assert(++count == 1);
|
2314 | a046433a | bellard | if (mapping->first_mapping_index == -1) |
2315 | a046433a | bellard | first_mapping = array_index(&(s->mapping), mapping); |
2316 | a046433a | bellard | else
|
2317 | a046433a | bellard | assert(first_mapping == mapping->first_mapping_index); |
2318 | a046433a | bellard | if (mapping->info.dir.parent_mapping_index < 0) |
2319 | a046433a | bellard | assert(j == 0);
|
2320 | a046433a | bellard | else {
|
2321 | c227f099 | Anthony Liguori | mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
2322 | a046433a | bellard | assert(parent->mode & MODE_DIRECTORY); |
2323 | a046433a | bellard | assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); |
2324 | a046433a | bellard | } |
2325 | a046433a | bellard | } |
2326 | de167e41 | bellard | } |
2327 | a046433a | bellard | } |
2328 | a046433a | bellard | if (count == 0) |
2329 | a046433a | bellard | first_mapping = -1;
|
2330 | a046433a | bellard | } |
2331 | a046433a | bellard | } |
2332 | a046433a | bellard | } |
2333 | a046433a | bellard | #endif
|
2334 | de167e41 | bellard | |
2335 | a046433a | bellard | static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
2336 | a046433a | bellard | { |
2337 | a046433a | bellard | int i;
|
2338 | de167e41 | bellard | |
2339 | a046433a | bellard | #ifdef DEBUG
|
2340 | a046433a | bellard | fprintf(stderr, "handle_renames\n");
|
2341 | a046433a | bellard | for (i = 0; i < s->commits.next; i++) { |
2342 | c227f099 | Anthony Liguori | commit_t* commit = array_get(&(s->commits), i); |
2343 | a046433a | bellard | fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
2344 | a046433a | bellard | } |
2345 | a046433a | bellard | #endif
|
2346 | a046433a | bellard | |
2347 | a046433a | bellard | for (i = 0; i < s->commits.next;) { |
2348 | c227f099 | Anthony Liguori | commit_t* commit = array_get(&(s->commits), i); |
2349 | a046433a | bellard | if (commit->action == ACTION_RENAME) {
|
2350 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, |
2351 | a046433a | bellard | commit->param.rename.cluster); |
2352 | a046433a | bellard | char* old_path = mapping->path;
|
2353 | a046433a | bellard | |
2354 | a046433a | bellard | assert(commit->path); |
2355 | a046433a | bellard | mapping->path = commit->path; |
2356 | a046433a | bellard | if (rename(old_path, mapping->path))
|
2357 | a046433a | bellard | return -2; |
2358 | a046433a | bellard | |
2359 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2360 | a046433a | bellard | int l1 = strlen(mapping->path);
|
2361 | a046433a | bellard | int l2 = strlen(old_path);
|
2362 | a046433a | bellard | int diff = l1 - l2;
|
2363 | c227f099 | Anthony Liguori | direntry_t* direntry = array_get(&(s->directory), |
2364 | a046433a | bellard | mapping->info.dir.first_dir_index); |
2365 | a046433a | bellard | uint32_t c = mapping->begin; |
2366 | a046433a | bellard | int i = 0; |
2367 | a046433a | bellard | |
2368 | a046433a | bellard | /* recurse */
|
2369 | a046433a | bellard | while (!fat_eof(s, c)) {
|
2370 | a046433a | bellard | do {
|
2371 | c227f099 | Anthony Liguori | direntry_t* d = direntry + i; |
2372 | a046433a | bellard | |
2373 | a046433a | bellard | if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
2374 | c227f099 | Anthony Liguori | mapping_t* m = find_mapping_for_cluster(s, |
2375 | a046433a | bellard | begin_of_direntry(d)); |
2376 | a046433a | bellard | int l = strlen(m->path);
|
2377 | 3ec88e80 | aliguori | char* new_path = qemu_malloc(l + diff + 1); |
2378 | a046433a | bellard | |
2379 | a046433a | bellard | assert(!strncmp(m->path, mapping->path, l2)); |
2380 | a046433a | bellard | |
2381 | 363a37d5 | blueswir1 | pstrcpy(new_path, l + diff + 1, mapping->path);
|
2382 | 363a37d5 | blueswir1 | pstrcpy(new_path + l1, l + diff + 1 - l1,
|
2383 | 363a37d5 | blueswir1 | m->path + l2); |
2384 | a046433a | bellard | |
2385 | a046433a | bellard | schedule_rename(s, m->begin, new_path); |
2386 | de167e41 | bellard | } |
2387 | a046433a | bellard | i++; |
2388 | a046433a | bellard | } while((i % (0x10 * s->sectors_per_cluster)) != 0); |
2389 | a046433a | bellard | c = fat_get(s, c); |
2390 | de167e41 | bellard | } |
2391 | de167e41 | bellard | } |
2392 | de167e41 | bellard | |
2393 | a046433a | bellard | free(old_path); |
2394 | a046433a | bellard | array_remove(&(s->commits), i); |
2395 | a046433a | bellard | continue;
|
2396 | a046433a | bellard | } else if (commit->action == ACTION_MKDIR) { |
2397 | c227f099 | Anthony Liguori | mapping_t* mapping; |
2398 | a046433a | bellard | int j, parent_path_len;
|
2399 | a046433a | bellard | |
2400 | 48c2f068 | bellard | #ifdef __MINGW32__
|
2401 | 48c2f068 | bellard | if (mkdir(commit->path))
|
2402 | 48c2f068 | bellard | return -5; |
2403 | 48c2f068 | bellard | #else
|
2404 | 48c2f068 | bellard | if (mkdir(commit->path, 0755)) |
2405 | 48c2f068 | bellard | return -5; |
2406 | 48c2f068 | bellard | #endif
|
2407 | a046433a | bellard | |
2408 | a046433a | bellard | mapping = insert_mapping(s, commit->param.mkdir.cluster, |
2409 | a046433a | bellard | commit->param.mkdir.cluster + 1);
|
2410 | a046433a | bellard | if (mapping == NULL) |
2411 | a046433a | bellard | return -6; |
2412 | a046433a | bellard | |
2413 | a046433a | bellard | mapping->mode = MODE_DIRECTORY; |
2414 | a046433a | bellard | mapping->read_only = 0;
|
2415 | a046433a | bellard | mapping->path = commit->path; |
2416 | a046433a | bellard | j = s->directory.next; |
2417 | a046433a | bellard | assert(j); |
2418 | a046433a | bellard | insert_direntries(s, s->directory.next, |
2419 | a046433a | bellard | 0x10 * s->sectors_per_cluster);
|
2420 | a046433a | bellard | mapping->info.dir.first_dir_index = j; |
2421 | a046433a | bellard | |
2422 | a046433a | bellard | parent_path_len = strlen(commit->path) |
2423 | a046433a | bellard | - strlen(get_basename(commit->path)) - 1;
|
2424 | a046433a | bellard | for (j = 0; j < s->mapping.next; j++) { |
2425 | c227f099 | Anthony Liguori | mapping_t* m = array_get(&(s->mapping), j); |
2426 | a046433a | bellard | if (m->first_mapping_index < 0 && m != mapping && |
2427 | a046433a | bellard | !strncmp(m->path, mapping->path, parent_path_len) && |
2428 | a046433a | bellard | strlen(m->path) == parent_path_len) |
2429 | a046433a | bellard | break;
|
2430 | a046433a | bellard | } |
2431 | a046433a | bellard | assert(j < s->mapping.next); |
2432 | a046433a | bellard | mapping->info.dir.parent_mapping_index = j; |
2433 | a046433a | bellard | |
2434 | a046433a | bellard | array_remove(&(s->commits), i); |
2435 | a046433a | bellard | continue;
|
2436 | a046433a | bellard | } |
2437 | a046433a | bellard | |
2438 | a046433a | bellard | i++; |
2439 | a046433a | bellard | } |
2440 | a046433a | bellard | return 0; |
2441 | a046433a | bellard | } |
2442 | a046433a | bellard | |
2443 | a046433a | bellard | /*
|
2444 | a046433a | bellard | * TODO: make sure that the short name is not matching *another* file
|
2445 | a046433a | bellard | */
|
2446 | a046433a | bellard | static int handle_commits(BDRVVVFATState* s) |
2447 | a046433a | bellard | { |
2448 | a046433a | bellard | int i, fail = 0; |
2449 | a046433a | bellard | |
2450 | a046433a | bellard | vvfat_close_current_file(s); |
2451 | a046433a | bellard | |
2452 | a046433a | bellard | for (i = 0; !fail && i < s->commits.next; i++) { |
2453 | c227f099 | Anthony Liguori | commit_t* commit = array_get(&(s->commits), i); |
2454 | a046433a | bellard | switch(commit->action) {
|
2455 | a046433a | bellard | case ACTION_RENAME: case ACTION_MKDIR: |
2456 | a046433a | bellard | assert(0);
|
2457 | a046433a | bellard | fail = -2;
|
2458 | a046433a | bellard | break;
|
2459 | a046433a | bellard | case ACTION_WRITEOUT: {
|
2460 | c227f099 | Anthony Liguori | direntry_t* entry = array_get(&(s->directory), |
2461 | a046433a | bellard | commit->param.writeout.dir_index); |
2462 | a046433a | bellard | uint32_t begin = begin_of_direntry(entry); |
2463 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2464 | a046433a | bellard | |
2465 | a046433a | bellard | assert(mapping); |
2466 | a046433a | bellard | assert(mapping->begin == begin); |
2467 | a046433a | bellard | assert(commit->path == NULL);
|
2468 | a046433a | bellard | |
2469 | a046433a | bellard | if (commit_one_file(s, commit->param.writeout.dir_index,
|
2470 | a046433a | bellard | commit->param.writeout.modified_offset)) |
2471 | a046433a | bellard | fail = -3;
|
2472 | a046433a | bellard | |
2473 | a046433a | bellard | break;
|
2474 | a046433a | bellard | } |
2475 | a046433a | bellard | case ACTION_NEW_FILE: {
|
2476 | a046433a | bellard | int begin = commit->param.new_file.first_cluster;
|
2477 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2478 | c227f099 | Anthony Liguori | direntry_t* entry; |
2479 | a046433a | bellard | int i;
|
2480 | de167e41 | bellard | |
2481 | a046433a | bellard | /* find direntry */
|
2482 | a046433a | bellard | for (i = 0; i < s->directory.next; i++) { |
2483 | a046433a | bellard | entry = array_get(&(s->directory), i); |
2484 | a046433a | bellard | if (is_file(entry) && begin_of_direntry(entry) == begin)
|
2485 | a046433a | bellard | break;
|
2486 | de167e41 | bellard | } |
2487 | de167e41 | bellard | |
2488 | a046433a | bellard | if (i >= s->directory.next) {
|
2489 | a046433a | bellard | fail = -6;
|
2490 | a046433a | bellard | continue;
|
2491 | a046433a | bellard | } |
2492 | de167e41 | bellard | |
2493 | a046433a | bellard | /* make sure there exists an initial mapping */
|
2494 | a046433a | bellard | if (mapping && mapping->begin != begin) {
|
2495 | a046433a | bellard | mapping->end = begin; |
2496 | a046433a | bellard | mapping = NULL;
|
2497 | a046433a | bellard | } |
2498 | a046433a | bellard | if (mapping == NULL) { |
2499 | a046433a | bellard | mapping = insert_mapping(s, begin, begin+1);
|
2500 | a046433a | bellard | } |
2501 | a046433a | bellard | /* most members will be fixed in commit_mappings() */
|
2502 | a046433a | bellard | assert(commit->path); |
2503 | a046433a | bellard | mapping->path = commit->path; |
2504 | a046433a | bellard | mapping->read_only = 0;
|
2505 | a046433a | bellard | mapping->mode = MODE_NORMAL; |
2506 | a046433a | bellard | mapping->info.file.offset = 0;
|
2507 | a046433a | bellard | |
2508 | a046433a | bellard | if (commit_one_file(s, i, 0)) |
2509 | a046433a | bellard | fail = -7;
|
2510 | a046433a | bellard | |
2511 | a046433a | bellard | break;
|
2512 | a046433a | bellard | } |
2513 | a046433a | bellard | default:
|
2514 | a046433a | bellard | assert(0);
|
2515 | a046433a | bellard | } |
2516 | a046433a | bellard | } |
2517 | a046433a | bellard | if (i > 0 && array_remove_slice(&(s->commits), 0, i)) |
2518 | a046433a | bellard | return -1; |
2519 | a046433a | bellard | return fail;
|
2520 | a046433a | bellard | } |
2521 | a046433a | bellard | |
2522 | a046433a | bellard | static int handle_deletes(BDRVVVFATState* s) |
2523 | a046433a | bellard | { |
2524 | a046433a | bellard | int i, deferred = 1, deleted = 1; |
2525 | a046433a | bellard | |
2526 | a046433a | bellard | /* delete files corresponding to mappings marked as deleted */
|
2527 | a046433a | bellard | /* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
2528 | a046433a | bellard | while (deferred && deleted) {
|
2529 | a046433a | bellard | deferred = 0;
|
2530 | a046433a | bellard | deleted = 0;
|
2531 | a046433a | bellard | |
2532 | a046433a | bellard | for (i = 1; i < s->mapping.next; i++) { |
2533 | c227f099 | Anthony Liguori | mapping_t* mapping = array_get(&(s->mapping), i); |
2534 | a046433a | bellard | if (mapping->mode & MODE_DELETED) {
|
2535 | c227f099 | Anthony Liguori | direntry_t* entry = array_get(&(s->directory), |
2536 | a046433a | bellard | mapping->dir_index); |
2537 | a046433a | bellard | |
2538 | a046433a | bellard | if (is_free(entry)) {
|
2539 | a046433a | bellard | /* remove file/directory */
|
2540 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2541 | a046433a | bellard | int j, next_dir_index = s->directory.next,
|
2542 | a046433a | bellard | first_dir_index = mapping->info.dir.first_dir_index; |
2543 | a046433a | bellard | |
2544 | a046433a | bellard | if (rmdir(mapping->path) < 0) { |
2545 | a046433a | bellard | if (errno == ENOTEMPTY) {
|
2546 | a046433a | bellard | deferred++; |
2547 | a046433a | bellard | continue;
|
2548 | a046433a | bellard | } else
|
2549 | a046433a | bellard | return -5; |
2550 | de167e41 | bellard | } |
2551 | a046433a | bellard | |
2552 | a046433a | bellard | for (j = 1; j < s->mapping.next; j++) { |
2553 | c227f099 | Anthony Liguori | mapping_t* m = array_get(&(s->mapping), j); |
2554 | a046433a | bellard | if (m->mode & MODE_DIRECTORY &&
|
2555 | a046433a | bellard | m->info.dir.first_dir_index > |
2556 | a046433a | bellard | first_dir_index && |
2557 | a046433a | bellard | m->info.dir.first_dir_index < |
2558 | a046433a | bellard | next_dir_index) |
2559 | a046433a | bellard | next_dir_index = |
2560 | a046433a | bellard | m->info.dir.first_dir_index; |
2561 | de167e41 | bellard | } |
2562 | a046433a | bellard | remove_direntries(s, first_dir_index, |
2563 | a046433a | bellard | next_dir_index - first_dir_index); |
2564 | de167e41 | bellard | |
2565 | a046433a | bellard | deleted++; |
2566 | de167e41 | bellard | } |
2567 | a046433a | bellard | } else {
|
2568 | a046433a | bellard | if (unlink(mapping->path))
|
2569 | a046433a | bellard | return -4; |
2570 | a046433a | bellard | deleted++; |
2571 | de167e41 | bellard | } |
2572 | a046433a | bellard | DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
2573 | a046433a | bellard | remove_mapping(s, i); |
2574 | de167e41 | bellard | } |
2575 | de167e41 | bellard | } |
2576 | de167e41 | bellard | } |
2577 | a046433a | bellard | |
2578 | a046433a | bellard | return 0; |
2579 | a046433a | bellard | } |
2580 | a046433a | bellard | |
2581 | a046433a | bellard | /*
|
2582 | a046433a | bellard | * synchronize mapping with new state:
|
2583 | a046433a | bellard | *
|
2584 | a046433a | bellard | * - copy FAT (with bdrv_read)
|
2585 | a046433a | bellard | * - mark all filenames corresponding to mappings as deleted
|
2586 | a046433a | bellard | * - recurse direntries from root (using bs->bdrv_read)
|
2587 | a046433a | bellard | * - delete files corresponding to mappings marked as deleted
|
2588 | a046433a | bellard | */
|
2589 | a046433a | bellard | static int do_commit(BDRVVVFATState* s) |
2590 | a046433a | bellard | { |
2591 | a046433a | bellard | int ret = 0; |
2592 | a046433a | bellard | |
2593 | a046433a | bellard | /* the real meat are the commits. Nothing to do? Move along! */
|
2594 | a046433a | bellard | if (s->commits.next == 0) |
2595 | a046433a | bellard | return 0; |
2596 | a046433a | bellard | |
2597 | a046433a | bellard | vvfat_close_current_file(s); |
2598 | a046433a | bellard | |
2599 | a046433a | bellard | ret = handle_renames_and_mkdirs(s); |
2600 | a046433a | bellard | if (ret) {
|
2601 | a046433a | bellard | fprintf(stderr, "Error handling renames (%d)\n", ret);
|
2602 | a046433a | bellard | assert(0);
|
2603 | a046433a | bellard | return ret;
|
2604 | a046433a | bellard | } |
2605 | a046433a | bellard | |
2606 | 5fafdf24 | ths | /* copy FAT (with bdrv_read) */
|
2607 | a046433a | bellard | memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
2608 | a046433a | bellard | |
2609 | a046433a | bellard | /* recurse direntries from root (using bs->bdrv_read) */
|
2610 | a046433a | bellard | ret = commit_direntries(s, 0, -1); |
2611 | a046433a | bellard | if (ret) {
|
2612 | a046433a | bellard | fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
2613 | a046433a | bellard | assert(0);
|
2614 | a046433a | bellard | return ret;
|
2615 | a046433a | bellard | } |
2616 | a046433a | bellard | |
2617 | a046433a | bellard | ret = handle_commits(s); |
2618 | a046433a | bellard | if (ret) {
|
2619 | a046433a | bellard | fprintf(stderr, "Error handling commits (%d)\n", ret);
|
2620 | a046433a | bellard | assert(0);
|
2621 | a046433a | bellard | return ret;
|
2622 | a046433a | bellard | } |
2623 | a046433a | bellard | |
2624 | a046433a | bellard | ret = handle_deletes(s); |
2625 | a046433a | bellard | if (ret) {
|
2626 | a046433a | bellard | fprintf(stderr, "Error deleting\n");
|
2627 | a046433a | bellard | assert(0);
|
2628 | a046433a | bellard | return ret;
|
2629 | a046433a | bellard | } |
2630 | a046433a | bellard | |
2631 | a046433a | bellard | s->qcow->drv->bdrv_make_empty(s->qcow); |
2632 | a046433a | bellard | |
2633 | a046433a | bellard | memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
2634 | a046433a | bellard | |
2635 | a046433a | bellard | DLOG(checkpoint()); |
2636 | a046433a | bellard | return 0; |
2637 | a046433a | bellard | } |
2638 | a046433a | bellard | |
2639 | a046433a | bellard | static int try_commit(BDRVVVFATState* s) |
2640 | a046433a | bellard | { |
2641 | a046433a | bellard | vvfat_close_current_file(s); |
2642 | a046433a | bellard | DLOG(checkpoint()); |
2643 | a046433a | bellard | if(!is_consistent(s))
|
2644 | a046433a | bellard | return -1; |
2645 | a046433a | bellard | return do_commit(s);
|
2646 | a046433a | bellard | } |
2647 | a046433a | bellard | |
2648 | 5fafdf24 | ths | static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
2649 | a046433a | bellard | const uint8_t *buf, int nb_sectors) |
2650 | a046433a | bellard | { |
2651 | 5fafdf24 | ths | BDRVVVFATState *s = bs->opaque; |
2652 | a046433a | bellard | int i, ret;
|
2653 | a046433a | bellard | |
2654 | a046433a | bellard | DLOG(checkpoint()); |
2655 | a046433a | bellard | |
2656 | a046433a | bellard | vvfat_close_current_file(s); |
2657 | a046433a | bellard | |
2658 | a046433a | bellard | /*
|
2659 | a046433a | bellard | * Some sanity checks:
|
2660 | a046433a | bellard | * - do not allow writing to the boot sector
|
2661 | a046433a | bellard | * - do not allow to write non-ASCII filenames
|
2662 | a046433a | bellard | */
|
2663 | a046433a | bellard | |
2664 | a046433a | bellard | if (sector_num < s->first_sectors_number)
|
2665 | a046433a | bellard | return -1; |
2666 | a046433a | bellard | |
2667 | a046433a | bellard | for (i = sector2cluster(s, sector_num);
|
2668 | a046433a | bellard | i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
2669 | c227f099 | Anthony Liguori | mapping_t* mapping = find_mapping_for_cluster(s, i); |
2670 | a046433a | bellard | if (mapping) {
|
2671 | a046433a | bellard | if (mapping->read_only) {
|
2672 | a046433a | bellard | fprintf(stderr, "Tried to write to write-protected file %s\n",
|
2673 | a046433a | bellard | mapping->path); |
2674 | a046433a | bellard | return -1; |
2675 | a046433a | bellard | } |
2676 | a046433a | bellard | |
2677 | a046433a | bellard | if (mapping->mode & MODE_DIRECTORY) {
|
2678 | a046433a | bellard | int begin = cluster2sector(s, i);
|
2679 | a046433a | bellard | int end = begin + s->sectors_per_cluster, k;
|
2680 | a046433a | bellard | int dir_index;
|
2681 | c227f099 | Anthony Liguori | const direntry_t* direntries;
|
2682 | a046433a | bellard | long_file_name lfn; |
2683 | a046433a | bellard | |
2684 | a046433a | bellard | lfn_init(&lfn); |
2685 | a046433a | bellard | |
2686 | a046433a | bellard | if (begin < sector_num)
|
2687 | a046433a | bellard | begin = sector_num; |
2688 | a046433a | bellard | if (end > sector_num + nb_sectors)
|
2689 | a046433a | bellard | end = sector_num + nb_sectors; |
2690 | 5fafdf24 | ths | dir_index = mapping->dir_index + |
2691 | a046433a | bellard | 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
2692 | c227f099 | Anthony Liguori | direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
2693 | a046433a | bellard | |
2694 | a046433a | bellard | for (k = 0; k < (end - begin) * 0x10; k++) { |
2695 | a046433a | bellard | /* do not allow non-ASCII filenames */
|
2696 | a046433a | bellard | if (parse_long_name(&lfn, direntries + k) < 0) { |
2697 | a046433a | bellard | fprintf(stderr, "Warning: non-ASCII filename\n");
|
2698 | a046433a | bellard | return -1; |
2699 | a046433a | bellard | } |
2700 | a046433a | bellard | /* no access to the direntry of a read-only file */
|
2701 | a046433a | bellard | else if (is_short_name(direntries+k) && |
2702 | a046433a | bellard | (direntries[k].attributes & 1)) {
|
2703 | a046433a | bellard | if (memcmp(direntries + k,
|
2704 | a046433a | bellard | array_get(&(s->directory), dir_index + k), |
2705 | c227f099 | Anthony Liguori | sizeof(direntry_t))) {
|
2706 | a046433a | bellard | fprintf(stderr, "Warning: tried to write to write-protected file\n");
|
2707 | a046433a | bellard | return -1; |
2708 | a046433a | bellard | } |
2709 | a046433a | bellard | } |
2710 | a046433a | bellard | } |
2711 | a046433a | bellard | } |
2712 | a046433a | bellard | i = mapping->end; |
2713 | a046433a | bellard | } else
|
2714 | a046433a | bellard | i++; |
2715 | a046433a | bellard | } |
2716 | a046433a | bellard | |
2717 | a046433a | bellard | /*
|
2718 | a046433a | bellard | * Use qcow backend. Commit later.
|
2719 | a046433a | bellard | */
|
2720 | a046433a | bellard | DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); |
2721 | a046433a | bellard | ret = s->qcow->drv->bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
2722 | a046433a | bellard | if (ret < 0) { |
2723 | a046433a | bellard | fprintf(stderr, "Error writing to qcow backend\n");
|
2724 | a046433a | bellard | return ret;
|
2725 | a046433a | bellard | } |
2726 | a046433a | bellard | |
2727 | a046433a | bellard | for (i = sector2cluster(s, sector_num);
|
2728 | a046433a | bellard | i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
2729 | a046433a | bellard | if (i >= 0) |
2730 | a046433a | bellard | s->used_clusters[i] |= USED_ALLOCATED; |
2731 | a046433a | bellard | |
2732 | a046433a | bellard | DLOG(checkpoint()); |
2733 | a046433a | bellard | /* TODO: add timeout */
|
2734 | a046433a | bellard | try_commit(s); |
2735 | a046433a | bellard | |
2736 | a046433a | bellard | DLOG(checkpoint()); |
2737 | a046433a | bellard | return 0; |
2738 | a046433a | bellard | } |
2739 | a046433a | bellard | |
2740 | a046433a | bellard | static int vvfat_is_allocated(BlockDriverState *bs, |
2741 | a046433a | bellard | int64_t sector_num, int nb_sectors, int* n) |
2742 | a046433a | bellard | { |
2743 | a046433a | bellard | BDRVVVFATState* s = bs->opaque; |
2744 | a046433a | bellard | *n = s->sector_count - sector_num; |
2745 | a046433a | bellard | if (*n > nb_sectors)
|
2746 | a046433a | bellard | *n = nb_sectors; |
2747 | a046433a | bellard | else if (*n < 0) |
2748 | a046433a | bellard | return 0; |
2749 | 5fafdf24 | ths | return 1; |
2750 | a046433a | bellard | } |
2751 | a046433a | bellard | |
2752 | a046433a | bellard | static int write_target_commit(BlockDriverState *bs, int64_t sector_num, |
2753 | a046433a | bellard | const uint8_t* buffer, int nb_sectors) { |
2754 | a046433a | bellard | BDRVVVFATState* s = bs->opaque; |
2755 | a046433a | bellard | return try_commit(s);
|
2756 | a046433a | bellard | } |
2757 | a046433a | bellard | |
2758 | a046433a | bellard | static void write_target_close(BlockDriverState *bs) { |
2759 | a046433a | bellard | BDRVVVFATState* s = bs->opaque; |
2760 | a046433a | bellard | bdrv_delete(s->qcow); |
2761 | a046433a | bellard | free(s->qcow_filename); |
2762 | a046433a | bellard | } |
2763 | a046433a | bellard | |
2764 | a046433a | bellard | static BlockDriver vvfat_write_target = {
|
2765 | f9e96436 | Christoph Hellwig | .format_name = "vvfat_write_target",
|
2766 | f9e96436 | Christoph Hellwig | .bdrv_write = write_target_commit, |
2767 | f9e96436 | Christoph Hellwig | .bdrv_close = write_target_close, |
2768 | a046433a | bellard | }; |
2769 | a046433a | bellard | |
2770 | a046433a | bellard | static int enable_write_target(BDRVVVFATState *s) |
2771 | a046433a | bellard | { |
2772 | 91a073a9 | Kevin Wolf | BlockDriver *bdrv_qcow; |
2773 | 91a073a9 | Kevin Wolf | QEMUOptionParameter *options; |
2774 | a046433a | bellard | int size = sector2cluster(s, s->sector_count);
|
2775 | a046433a | bellard | s->used_clusters = calloc(size, 1);
|
2776 | a046433a | bellard | |
2777 | c227f099 | Anthony Liguori | array_init(&(s->commits), sizeof(commit_t));
|
2778 | a046433a | bellard | |
2779 | 3ec88e80 | aliguori | s->qcow_filename = qemu_malloc(1024);
|
2780 | 83f64091 | bellard | get_tmp_filename(s->qcow_filename, 1024);
|
2781 | 91a073a9 | Kevin Wolf | |
2782 | 91a073a9 | Kevin Wolf | bdrv_qcow = bdrv_find_format("qcow");
|
2783 | 91a073a9 | Kevin Wolf | options = parse_option_parameters("", bdrv_qcow->create_options, NULL); |
2784 | 91a073a9 | Kevin Wolf | set_option_parameter_int(options, BLOCK_OPT_SIZE, s->sector_count * 512);
|
2785 | 91a073a9 | Kevin Wolf | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, "fat:");
|
2786 | 91a073a9 | Kevin Wolf | |
2787 | 91a073a9 | Kevin Wolf | if (bdrv_create(bdrv_qcow, s->qcow_filename, options) < 0) |
2788 | a046433a | bellard | return -1; |
2789 | a046433a | bellard | s->qcow = bdrv_new("");
|
2790 | a046433a | bellard | if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0) |
2791 | a046433a | bellard | return -1; |
2792 | a046433a | bellard | |
2793 | a046433a | bellard | #ifndef _WIN32
|
2794 | a046433a | bellard | unlink(s->qcow_filename); |
2795 | a046433a | bellard | #endif
|
2796 | a046433a | bellard | |
2797 | a046433a | bellard | s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1); |
2798 | a046433a | bellard | s->bs->backing_hd->drv = &vvfat_write_target; |
2799 | a046433a | bellard | s->bs->backing_hd->opaque = s; |
2800 | a046433a | bellard | |
2801 | de167e41 | bellard | return 0; |
2802 | de167e41 | bellard | } |
2803 | de167e41 | bellard | |
2804 | de167e41 | bellard | static void vvfat_close(BlockDriverState *bs) |
2805 | de167e41 | bellard | { |
2806 | de167e41 | bellard | BDRVVVFATState *s = bs->opaque; |
2807 | de167e41 | bellard | |
2808 | de167e41 | bellard | vvfat_close_current_file(s); |
2809 | de167e41 | bellard | array_free(&(s->fat)); |
2810 | de167e41 | bellard | array_free(&(s->directory)); |
2811 | de167e41 | bellard | array_free(&(s->mapping)); |
2812 | a046433a | bellard | if(s->cluster_buffer)
|
2813 | a046433a | bellard | free(s->cluster_buffer); |
2814 | de167e41 | bellard | } |
2815 | de167e41 | bellard | |
2816 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_vvfat = {
|
2817 | e60f469c | aurel32 | .format_name = "vvfat",
|
2818 | e60f469c | aurel32 | .instance_size = sizeof(BDRVVVFATState),
|
2819 | e60f469c | aurel32 | .bdrv_open = vvfat_open, |
2820 | e60f469c | aurel32 | .bdrv_read = vvfat_read, |
2821 | e60f469c | aurel32 | .bdrv_write = vvfat_write, |
2822 | e60f469c | aurel32 | .bdrv_close = vvfat_close, |
2823 | e60f469c | aurel32 | .bdrv_is_allocated = vvfat_is_allocated, |
2824 | e60f469c | aurel32 | .protocol_name = "fat",
|
2825 | de167e41 | bellard | }; |
2826 | de167e41 | bellard | |
2827 | 5efa9d5a | Anthony Liguori | static void bdrv_vvfat_init(void) |
2828 | 5efa9d5a | Anthony Liguori | { |
2829 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_vvfat); |
2830 | 5efa9d5a | Anthony Liguori | } |
2831 | 5efa9d5a | Anthony Liguori | |
2832 | 5efa9d5a | Anthony Liguori | block_init(bdrv_vvfat_init); |
2833 | 5efa9d5a | Anthony Liguori | |
2834 | a046433a | bellard | #ifdef DEBUG
|
2835 | 3f47aa8c | blueswir1 | static void checkpoint(void) { |
2836 | c227f099 | Anthony Liguori | assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
2837 | a046433a | bellard | check1(vvv); |
2838 | a046433a | bellard | check2(vvv); |
2839 | a046433a | bellard | assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); |
2840 | a046433a | bellard | #if 0
|
2841 | c227f099 | Anthony Liguori | if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
|
2842 | a046433a | bellard | fprintf(stderr, "Nonono!\n");
|
2843 | c227f099 | Anthony Liguori | mapping_t* mapping;
|
2844 | c227f099 | Anthony Liguori | direntry_t* direntry;
|
2845 | a046433a | bellard | assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
|
2846 | a046433a | bellard | assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
|
2847 | a046433a | bellard | if (vvv->mapping.next<47)
|
2848 | a046433a | bellard | return;
|
2849 | a046433a | bellard | assert((mapping = array_get(&(vvv->mapping), 47)));
|
2850 | a046433a | bellard | assert(mapping->dir_index < vvv->directory.next);
|
2851 | a046433a | bellard | direntry = array_get(&(vvv->directory), mapping->dir_index);
|
2852 | a046433a | bellard | assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
|
2853 | a046433a | bellard | #endif
|
2854 | a046433a | bellard | return;
|
2855 | a046433a | bellard | /* avoid compiler warnings: */
|
2856 | a046433a | bellard | hexdump(NULL, 100); |
2857 | a046433a | bellard | remove_mapping(vvv, NULL);
|
2858 | a046433a | bellard | print_mapping(NULL);
|
2859 | a046433a | bellard | print_direntry(NULL);
|
2860 | a046433a | bellard | } |
2861 | a046433a | bellard | #endif |