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/* vim:set shiftwidth=4 ts=8: */
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/*
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* QEMU Block driver for virtual VFAT (shadows a local directory)
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*
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* Copyright (c) 2004,2005 Johannes E. Schindelin
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <sys/stat.h> |
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#include <dirent.h> |
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#include <assert.h> |
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#include "vl.h" |
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#include "block_int.h" |
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#ifndef S_IWGRP
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#define S_IWGRP 0 |
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#endif
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#ifndef S_IWOTH
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#define S_IWOTH 0 |
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#endif
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/* TODO: add ":bootsector=blabla.img:" */
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/* LATER TODO: add automatic boot sector generation from
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BOOTEASY.ASM and Ranish Partition Manager
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Note that DOS assumes the system files to be the first files in the
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file system (test if the boot sector still relies on that fact)! */
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/* MAYBE TODO: write block-visofs.c */
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/* TODO: call try_commit() only after a timeout */
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/* #define DEBUG */
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#ifdef DEBUG
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#define DLOG(a) a
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#undef stderr
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#define stderr STDERR
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FILE* stderr = NULL;
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static void checkpoint(); |
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#ifdef __MINGW32__
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void nonono(const char* file, int line, const char* msg) { |
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fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg);
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exit(-5);
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} |
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#undef assert
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#define assert(a) if (!(a)) nonono(__FILE__, __LINE__, #a) |
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#endif
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#else
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#define DLOG(a)
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#endif
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/* dynamic array functions */
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typedef struct array_t { |
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char* pointer;
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unsigned int size,next,item_size; |
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} array_t; |
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static inline void array_init(array_t* array,unsigned int item_size) |
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{ |
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array->pointer=0;
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array->size=0;
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array->next=0;
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array->item_size=item_size; |
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} |
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static inline void array_free(array_t* array) |
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{ |
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if(array->pointer)
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free(array->pointer); |
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array->size=array->next=0;
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} |
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/* does not automatically grow */
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static inline void* array_get(array_t* array,unsigned int index) { |
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assert(index >= 0);
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assert(index < array->next); |
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return array->pointer + index * array->item_size;
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} |
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static inline int array_ensure_allocated(array_t* array, int index) |
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{ |
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if((index + 1) * array->item_size > array->size) { |
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int new_size = (index + 32) * array->item_size; |
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array->pointer = realloc(array->pointer, new_size); |
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if (!array->pointer)
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return -1; |
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array->size = new_size; |
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array->next = index + 1;
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} |
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return 0; |
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} |
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static inline void* array_get_next(array_t* array) { |
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unsigned int next = array->next; |
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void* result;
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if (array_ensure_allocated(array, next) < 0) |
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return NULL; |
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array->next = next + 1;
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result = array_get(array, next); |
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return result;
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} |
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static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) { |
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if((array->next+count)*array->item_size>array->size) {
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int increment=count*array->item_size;
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array->pointer=realloc(array->pointer,array->size+increment); |
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if(!array->pointer)
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return 0; |
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array->size+=increment; |
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} |
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memmove(array->pointer+(index+count)*array->item_size, |
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array->pointer+index*array->item_size, |
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(array->next-index)*array->item_size); |
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array->next+=count; |
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return array->pointer+index*array->item_size;
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} |
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/* this performs a "roll", so that the element which was at index_from becomes
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* index_to, but the order of all other elements is preserved. */
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static inline int array_roll(array_t* array,int index_to,int index_from,int count) |
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{ |
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char* buf;
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char* from;
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char* to;
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int is;
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if(!array ||
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index_to<0 || index_to>=array->next ||
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index_from<0 || index_from>=array->next)
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return -1; |
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if(index_to==index_from)
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return 0; |
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is=array->item_size; |
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from=array->pointer+index_from*is; |
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to=array->pointer+index_to*is; |
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buf=malloc(is*count); |
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memcpy(buf,from,is*count); |
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if(index_to<index_from)
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memmove(to+is*count,to,from-to); |
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else
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memmove(from,from+is*count,to-from); |
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memcpy(to,buf,is*count); |
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free(buf); |
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return 0; |
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} |
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inline int array_remove_slice(array_t* array,int index, int count) |
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{ |
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assert(index >=0);
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assert(count > 0);
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assert(index + count <= array->next); |
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if(array_roll(array,array->next-1,index,count)) |
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return -1; |
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array->next -= count; |
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return 0; |
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} |
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int array_remove(array_t* array,int index) |
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{ |
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return array_remove_slice(array, index, 1); |
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} |
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/* return the index for a given member */
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int array_index(array_t* array, void* pointer) |
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{ |
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size_t offset = (char*)pointer - array->pointer;
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assert(offset >= 0);
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assert((offset % array->item_size) == 0);
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assert(offset/array->item_size < array->next); |
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return offset/array->item_size;
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} |
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/* These structures are used to fake a disk and the VFAT filesystem.
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* For this reason we need to use __attribute__((packed)). */
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typedef struct bootsector_t { |
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uint8_t jump[3];
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uint8_t name[8];
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uint16_t sector_size; |
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uint8_t sectors_per_cluster; |
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uint16_t reserved_sectors; |
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uint8_t number_of_fats; |
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uint16_t root_entries; |
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uint16_t total_sectors16; |
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uint8_t media_type; |
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uint16_t sectors_per_fat; |
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uint16_t sectors_per_track; |
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uint16_t number_of_heads; |
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uint32_t hidden_sectors; |
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uint32_t total_sectors; |
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union {
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struct {
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uint8_t drive_number; |
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uint8_t current_head; |
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uint8_t signature; |
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uint32_t id; |
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uint8_t volume_label[11];
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} __attribute__((packed)) fat16; |
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struct {
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uint32_t sectors_per_fat; |
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uint16_t flags; |
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uint8_t major,minor; |
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uint32_t first_cluster_of_root_directory; |
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uint16_t info_sector; |
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uint16_t backup_boot_sector; |
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uint16_t ignored; |
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} __attribute__((packed)) fat32; |
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} u; |
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uint8_t fat_type[8];
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uint8_t ignored[0x1c0];
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uint8_t magic[2];
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} __attribute__((packed)) bootsector_t; |
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typedef struct partition_t { |
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uint8_t attributes; /* 0x80 = bootable */
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uint8_t start_head; |
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uint8_t start_sector; |
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uint8_t start_cylinder; |
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uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xb = FAT32 */
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uint8_t end_head; |
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uint8_t end_sector; |
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uint8_t end_cylinder; |
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uint32_t start_sector_long; |
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uint32_t end_sector_long; |
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} __attribute__((packed)) partition_t; |
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typedef struct mbr_t { |
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uint8_t ignored[0x1be];
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partition_t partition[4];
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uint8_t magic[2];
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} __attribute__((packed)) mbr_t; |
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typedef struct direntry_t { |
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uint8_t name[8];
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uint8_t extension[3];
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uint8_t attributes; |
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uint8_t reserved[2];
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uint16_t ctime; |
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uint16_t cdate; |
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uint16_t adate; |
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uint16_t begin_hi; |
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uint16_t mtime; |
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uint16_t mdate; |
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uint16_t begin; |
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uint32_t size; |
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} __attribute__((packed)) direntry_t; |
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/* this structure are used to transparently access the files */
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typedef struct mapping_t { |
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/* begin is the first cluster, end is the last+1 */
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uint32_t begin,end; |
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/* as s->directory is growable, no pointer may be used here */
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unsigned int dir_index; |
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/* the clusters of a file may be in any order; this points to the first */
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int first_mapping_index;
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union {
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/* offset is
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* - the offset in the file (in clusters) for a file, or
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* - the next cluster of the directory for a directory, and
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* - the address of the buffer for a faked entry
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*/
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struct {
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uint32_t offset; |
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} file; |
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struct {
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int parent_mapping_index;
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int first_dir_index;
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} dir; |
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} info; |
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/* path contains the full path, i.e. it always starts with s->path */
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char* path;
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enum { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2, |
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MODE_DIRECTORY = 4, MODE_FAKED = 8, |
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MODE_DELETED = 16, MODE_RENAMED = 32 } mode; |
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int read_only;
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} mapping_t; |
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#ifdef DEBUG
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static void print_direntry(const struct direntry_t*); |
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static void print_mapping(const struct mapping_t* mapping); |
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#endif
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/* here begins the real VVFAT driver */
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typedef struct BDRVVVFATState { |
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BlockDriverState* bs; /* pointer to parent */
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unsigned int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */ |
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unsigned char first_sectors[0x40*0x200]; |
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int fat_type; /* 16 or 32 */ |
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array_t fat,directory,mapping; |
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unsigned int cluster_size; |
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unsigned int sectors_per_cluster; |
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unsigned int sectors_per_fat; |
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unsigned int sectors_of_root_directory; |
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uint32_t last_cluster_of_root_directory; |
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unsigned int faked_sectors; /* how many sectors are faked before file data */ |
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uint32_t sector_count; /* total number of sectors of the partition */
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uint32_t cluster_count; /* total number of clusters of this partition */
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uint32_t max_fat_value; |
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int current_fd;
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mapping_t* current_mapping; |
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unsigned char* cluster; /* points to current cluster */ |
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unsigned char* cluster_buffer; /* points to a buffer to hold temp data */ |
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unsigned int current_cluster; |
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|
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/* write support */
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BlockDriverState* write_target; |
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char* qcow_filename;
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BlockDriverState* qcow; |
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void* fat2;
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char* used_clusters;
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array_t commits; |
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const char* path; |
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int downcase_short_names;
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} BDRVVVFATState; |
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|
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|
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static int vvfat_probe(const uint8_t *buf, int buf_size, const char *filename) |
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{ |
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if (strstart(filename, "fat:", NULL)) |
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return 100; |
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return 0; |
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} |
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static void init_mbr(BDRVVVFATState* s) |
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{ |
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/* TODO: if the files mbr.img and bootsect.img exist, use them */
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mbr_t* real_mbr=(mbr_t*)s->first_sectors; |
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partition_t* partition=&(real_mbr->partition[0]);
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memset(s->first_sectors,0,512); |
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partition->attributes=0x80; /* bootable */ |
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partition->start_head=1;
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partition->start_sector=1;
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partition->start_cylinder=0;
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/* FAT12/FAT16/FAT32 */
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partition->fs_type=(s->fat_type==12?0x1:s->fat_type==16?0x6:0xb); |
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partition->end_head=s->bs->heads-1;
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partition->end_sector=0xff; /* end sector & upper 2 bits of cylinder */; |
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partition->end_cylinder=0xff; /* lower 8 bits of end cylinder */; |
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partition->start_sector_long=cpu_to_le32(s->bs->secs); |
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partition->end_sector_long=cpu_to_le32(s->sector_count); |
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real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; |
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} |
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|
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/* direntry functions */
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|
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/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
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static inline int short2long_name(unsigned char* dest,const char* src) |
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{ |
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int i;
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for(i=0;i<129 && src[i];i++) { |
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dest[2*i]=src[i];
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dest[2*i+1]=0; |
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} |
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dest[2*i]=dest[2*i+1]=0; |
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for(i=2*i+2;(i%26);i++) |
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dest[i]=0xff;
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return i;
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} |
399 |
|
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static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
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{ |
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char buffer[258]; |
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int length=short2long_name(buffer,filename),
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number_of_entries=(length+25)/26,i; |
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direntry_t* entry; |
406 |
|
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for(i=0;i<number_of_entries;i++) { |
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entry=array_get_next(&(s->directory)); |
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entry->attributes=0xf;
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entry->reserved[0]=0; |
411 |
entry->begin=0;
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entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); |
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} |
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for(i=0;i<length;i++) { |
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int offset=(i%26); |
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if(offset<10) offset=1+offset; |
417 |
else if(offset<22) offset=14+offset-10; |
418 |
else offset=28+offset-22; |
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entry=array_get(&(s->directory),s->directory.next-1-(i/26)); |
420 |
entry->name[offset]=buffer[i]; |
421 |
} |
422 |
return array_get(&(s->directory),s->directory.next-number_of_entries);
|
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} |
424 |
|
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static char is_free(const direntry_t* direntry) |
426 |
{ |
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/* return direntry->name[0]==0 ; */
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return direntry->attributes == 0 || direntry->name[0]==0xe5; |
429 |
} |
430 |
|
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static char is_volume_label(const direntry_t* direntry) |
432 |
{ |
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return direntry->attributes == 0x28; |
434 |
} |
435 |
|
436 |
static char is_long_name(const direntry_t* direntry) |
437 |
{ |
438 |
return direntry->attributes == 0xf; |
439 |
} |
440 |
|
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static char is_short_name(const direntry_t* direntry) |
442 |
{ |
443 |
return !is_volume_label(direntry) && !is_long_name(direntry)
|
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&& !is_free(direntry); |
445 |
} |
446 |
|
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static char is_directory(const direntry_t* direntry) |
448 |
{ |
449 |
return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; |
450 |
} |
451 |
|
452 |
static inline char is_dot(const direntry_t* direntry) |
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{ |
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return is_short_name(direntry) && direntry->name[0] == '.'; |
455 |
} |
456 |
|
457 |
static char is_file(const direntry_t* direntry) |
458 |
{ |
459 |
return is_short_name(direntry) && !is_directory(direntry);
|
460 |
} |
461 |
|
462 |
static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
463 |
{ |
464 |
return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); |
465 |
} |
466 |
|
467 |
static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
468 |
{ |
469 |
return le32_to_cpu(direntry->size);
|
470 |
} |
471 |
|
472 |
static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
473 |
{ |
474 |
direntry->begin = cpu_to_le16(begin & 0xffff);
|
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direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); |
476 |
} |
477 |
|
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/* fat functions */
|
479 |
|
480 |
static inline uint8_t fat_chksum(const direntry_t* entry) |
481 |
{ |
482 |
uint8_t chksum=0;
|
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int i;
|
484 |
|
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for(i=0;i<11;i++) |
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chksum=(((chksum&0xfe)>>1)|((chksum&0x01)?0x80:0)) |
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+(unsigned char)entry->name[i]; |
488 |
|
489 |
return chksum;
|
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} |
491 |
|
492 |
/* if return_time==0, this returns the fat_date, else the fat_time */
|
493 |
static uint16_t fat_datetime(time_t time,int return_time) { |
494 |
struct tm* t;
|
495 |
#ifdef _WIN32
|
496 |
t=localtime(&time); /* this is not thread safe */
|
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#else
|
498 |
struct tm t1;
|
499 |
t=&t1; |
500 |
localtime_r(&time,t); |
501 |
#endif
|
502 |
if(return_time)
|
503 |
return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); |
504 |
return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); |
505 |
} |
506 |
|
507 |
static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) |
508 |
{ |
509 |
if(s->fat_type==32) { |
510 |
uint32_t* entry=array_get(&(s->fat),cluster); |
511 |
*entry=cpu_to_le32(value); |
512 |
} else if(s->fat_type==16) { |
513 |
uint16_t* entry=array_get(&(s->fat),cluster); |
514 |
*entry=cpu_to_le16(value&0xffff);
|
515 |
} else {
|
516 |
int offset = (cluster*3/2); |
517 |
unsigned char* p = array_get(&(s->fat), offset); |
518 |
switch (cluster&1) { |
519 |
case 0: |
520 |
p[0] = value&0xff; |
521 |
p[1] = (p[1]&0xf0) | ((value>>8)&0xf); |
522 |
break;
|
523 |
case 1: |
524 |
p[0] = (p[0]&0xf) | ((value&0xf)<<4); |
525 |
p[1] = (value>>4); |
526 |
break;
|
527 |
} |
528 |
} |
529 |
} |
530 |
|
531 |
static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) |
532 |
{ |
533 |
if(s->fat_type==32) { |
534 |
uint32_t* entry=array_get(&(s->fat),cluster); |
535 |
return le32_to_cpu(*entry);
|
536 |
} else if(s->fat_type==16) { |
537 |
uint16_t* entry=array_get(&(s->fat),cluster); |
538 |
return le16_to_cpu(*entry);
|
539 |
} else {
|
540 |
const uint8_t* x=s->fat.pointer+cluster*3/2; |
541 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
542 |
} |
543 |
} |
544 |
|
545 |
static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) |
546 |
{ |
547 |
if(fat_entry>s->max_fat_value-8) |
548 |
return -1; |
549 |
return 0; |
550 |
} |
551 |
|
552 |
static inline void init_fat(BDRVVVFATState* s) |
553 |
{ |
554 |
if (s->fat_type == 12) { |
555 |
array_init(&(s->fat),1);
|
556 |
array_ensure_allocated(&(s->fat), |
557 |
s->sectors_per_fat * 0x200 * 3 / 2 - 1); |
558 |
} else {
|
559 |
array_init(&(s->fat),(s->fat_type==32?4:2)); |
560 |
array_ensure_allocated(&(s->fat), |
561 |
s->sectors_per_fat * 0x200 / s->fat.item_size - 1); |
562 |
} |
563 |
memset(s->fat.pointer,0,s->fat.size);
|
564 |
|
565 |
switch(s->fat_type) {
|
566 |
case 12: s->max_fat_value=0xfff; break; |
567 |
case 16: s->max_fat_value=0xffff; break; |
568 |
case 32: s->max_fat_value=0x0fffffff; break; |
569 |
default: s->max_fat_value=0; /* error... */ |
570 |
} |
571 |
|
572 |
} |
573 |
|
574 |
/* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
|
575 |
/* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
|
576 |
static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
577 |
unsigned int directory_start, const char* filename, int is_dot) |
578 |
{ |
579 |
int i,j,long_index=s->directory.next;
|
580 |
direntry_t* entry=0;
|
581 |
direntry_t* entry_long=0;
|
582 |
|
583 |
if(is_dot) {
|
584 |
entry=array_get_next(&(s->directory)); |
585 |
memset(entry->name,0x20,11); |
586 |
memcpy(entry->name,filename,strlen(filename)); |
587 |
return entry;
|
588 |
} |
589 |
|
590 |
entry_long=create_long_filename(s,filename); |
591 |
|
592 |
i = strlen(filename); |
593 |
for(j = i - 1; j>0 && filename[j]!='.';j--); |
594 |
if (j > 0) |
595 |
i = (j > 8 ? 8 : j); |
596 |
else if (i > 8) |
597 |
i = 8;
|
598 |
|
599 |
entry=array_get_next(&(s->directory)); |
600 |
memset(entry->name,0x20,11); |
601 |
strncpy(entry->name,filename,i); |
602 |
|
603 |
if(j > 0) |
604 |
for (i = 0; i < 3 && filename[j+1+i]; i++) |
605 |
entry->extension[i] = filename[j+1+i];
|
606 |
|
607 |
/* upcase & remove unwanted characters */
|
608 |
for(i=10;i>=0;i--) { |
609 |
if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
610 |
if(entry->name[i]<=' ' || entry->name[i]>0x7f |
611 |
|| strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
|
612 |
entry->name[i]='_';
|
613 |
else if(entry->name[i]>='a' && entry->name[i]<='z') |
614 |
entry->name[i]+='A'-'a'; |
615 |
} |
616 |
|
617 |
/* mangle duplicates */
|
618 |
while(1) { |
619 |
direntry_t* entry1=array_get(&(s->directory),directory_start); |
620 |
int j;
|
621 |
|
622 |
for(;entry1<entry;entry1++)
|
623 |
if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
624 |
break; /* found dupe */ |
625 |
if(entry1==entry) /* no dupe found */ |
626 |
break;
|
627 |
|
628 |
/* use all 8 characters of name */
|
629 |
if(entry->name[7]==' ') { |
630 |
int j;
|
631 |
for(j=6;j>0 && entry->name[j]==' ';j--) |
632 |
entry->name[j]='~';
|
633 |
} |
634 |
|
635 |
/* increment number */
|
636 |
for(j=7;j>0 && entry->name[j]=='9';j--) |
637 |
entry->name[j]='0';
|
638 |
if(j>0) { |
639 |
if(entry->name[j]<'0' || entry->name[j]>'9') |
640 |
entry->name[j]='0';
|
641 |
else
|
642 |
entry->name[j]++; |
643 |
} |
644 |
} |
645 |
|
646 |
/* calculate checksum; propagate to long name */
|
647 |
if(entry_long) {
|
648 |
uint8_t chksum=fat_chksum(entry); |
649 |
|
650 |
/* calculate anew, because realloc could have taken place */
|
651 |
entry_long=array_get(&(s->directory),long_index); |
652 |
while(entry_long<entry && is_long_name(entry_long)) {
|
653 |
entry_long->reserved[1]=chksum;
|
654 |
entry_long++; |
655 |
} |
656 |
} |
657 |
|
658 |
return entry;
|
659 |
} |
660 |
|
661 |
/*
|
662 |
* Read a directory. (the index of the corresponding mapping must be passed).
|
663 |
*/
|
664 |
static int read_directory(BDRVVVFATState* s, int mapping_index) |
665 |
{ |
666 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
667 |
direntry_t* direntry; |
668 |
const char* dirname = mapping->path; |
669 |
int first_cluster = mapping->begin;
|
670 |
int parent_index = mapping->info.dir.parent_mapping_index;
|
671 |
mapping_t* parent_mapping = (mapping_t*) |
672 |
(parent_index >= 0 ? array_get(&(s->mapping), parent_index) : 0); |
673 |
int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
674 |
|
675 |
DIR* dir=opendir(dirname); |
676 |
struct dirent* entry;
|
677 |
int i;
|
678 |
|
679 |
assert(mapping->mode & MODE_DIRECTORY); |
680 |
|
681 |
if(!dir) {
|
682 |
mapping->end = mapping->begin; |
683 |
return -1; |
684 |
} |
685 |
|
686 |
i = mapping->info.dir.first_dir_index = |
687 |
first_cluster == 0 ? 0 : s->directory.next; |
688 |
|
689 |
/* actually read the directory, and allocate the mappings */
|
690 |
while((entry=readdir(dir))) {
|
691 |
unsigned int length=strlen(dirname)+2+strlen(entry->d_name); |
692 |
char* buffer;
|
693 |
direntry_t* direntry; |
694 |
struct stat st;
|
695 |
int is_dot=!strcmp(entry->d_name,"."); |
696 |
int is_dotdot=!strcmp(entry->d_name,".."); |
697 |
|
698 |
if(first_cluster == 0 && (is_dotdot || is_dot)) |
699 |
continue;
|
700 |
|
701 |
buffer=(char*)malloc(length);
|
702 |
assert(buffer); |
703 |
snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
704 |
|
705 |
if(stat(buffer,&st)<0) { |
706 |
free(buffer); |
707 |
continue;
|
708 |
} |
709 |
|
710 |
/* create directory entry for this file */
|
711 |
direntry=create_short_and_long_name(s, i, entry->d_name, |
712 |
is_dot || is_dotdot); |
713 |
direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
714 |
direntry->reserved[0]=direntry->reserved[1]=0; |
715 |
direntry->ctime=fat_datetime(st.st_ctime,1);
|
716 |
direntry->cdate=fat_datetime(st.st_ctime,0);
|
717 |
direntry->adate=fat_datetime(st.st_atime,0);
|
718 |
direntry->begin_hi=0;
|
719 |
direntry->mtime=fat_datetime(st.st_mtime,1);
|
720 |
direntry->mdate=fat_datetime(st.st_mtime,0);
|
721 |
if(is_dotdot)
|
722 |
set_begin_of_direntry(direntry, first_cluster_of_parent); |
723 |
else if(is_dot) |
724 |
set_begin_of_direntry(direntry, first_cluster); |
725 |
else
|
726 |
direntry->begin=0; /* do that later */ |
727 |
if (st.st_size > 0x7fffffff) { |
728 |
fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
729 |
free(buffer); |
730 |
return -2; |
731 |
} |
732 |
direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
733 |
|
734 |
/* create mapping for this file */
|
735 |
if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
736 |
s->current_mapping=(mapping_t*)array_get_next(&(s->mapping)); |
737 |
s->current_mapping->begin=0;
|
738 |
s->current_mapping->end=st.st_size; |
739 |
/*
|
740 |
* we get the direntry of the most recent direntry, which
|
741 |
* contains the short name and all the relevant information.
|
742 |
*/
|
743 |
s->current_mapping->dir_index=s->directory.next-1;
|
744 |
s->current_mapping->first_mapping_index = -1;
|
745 |
if (S_ISDIR(st.st_mode)) {
|
746 |
s->current_mapping->mode = MODE_DIRECTORY; |
747 |
s->current_mapping->info.dir.parent_mapping_index = |
748 |
mapping_index; |
749 |
} else {
|
750 |
s->current_mapping->mode = MODE_UNDEFINED; |
751 |
s->current_mapping->info.file.offset = 0;
|
752 |
} |
753 |
s->current_mapping->path=buffer; |
754 |
s->current_mapping->read_only = |
755 |
(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
756 |
} |
757 |
} |
758 |
closedir(dir); |
759 |
|
760 |
/* fill with zeroes up to the end of the cluster */
|
761 |
while(s->directory.next%(0x10*s->sectors_per_cluster)) { |
762 |
direntry_t* direntry=array_get_next(&(s->directory)); |
763 |
memset(direntry,0,sizeof(direntry_t)); |
764 |
} |
765 |
|
766 |
/* TODO: if there are more entries, bootsector has to be adjusted! */
|
767 |
#define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) |
768 |
if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { |
769 |
/* root directory */
|
770 |
int cur = s->directory.next;
|
771 |
array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
|
772 |
memset(array_get(&(s->directory), cur), 0,
|
773 |
(ROOT_ENTRIES - cur) * sizeof(direntry_t));
|
774 |
} |
775 |
|
776 |
/* reget the mapping, since s->mapping was possibly realloc()ed */
|
777 |
mapping = (mapping_t*)array_get(&(s->mapping), mapping_index); |
778 |
first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
779 |
* 0x20 / s->cluster_size;
|
780 |
mapping->end = first_cluster; |
781 |
|
782 |
direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index); |
783 |
set_begin_of_direntry(direntry, mapping->begin); |
784 |
|
785 |
return 0; |
786 |
} |
787 |
|
788 |
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
789 |
{ |
790 |
return (sector_num-s->faked_sectors)/s->sectors_per_cluster;
|
791 |
} |
792 |
|
793 |
static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
794 |
{ |
795 |
return s->faked_sectors + s->sectors_per_cluster * cluster_num;
|
796 |
} |
797 |
|
798 |
static inline uint32_t sector_offset_in_cluster(BDRVVVFATState* s,off_t sector_num) |
799 |
{ |
800 |
return (sector_num-s->first_sectors_number-2*s->sectors_per_fat)%s->sectors_per_cluster; |
801 |
} |
802 |
|
803 |
#ifdef DBG
|
804 |
static direntry_t* get_direntry_for_mapping(BDRVVVFATState* s,mapping_t* mapping)
|
805 |
{ |
806 |
if(mapping->mode==MODE_UNDEFINED)
|
807 |
return 0; |
808 |
return (direntry_t*)(s->directory.pointer+sizeof(direntry_t)*mapping->dir_index); |
809 |
} |
810 |
#endif
|
811 |
|
812 |
static int init_directories(BDRVVVFATState* s, |
813 |
const char* dirname) |
814 |
{ |
815 |
bootsector_t* bootsector; |
816 |
mapping_t* mapping; |
817 |
unsigned int i; |
818 |
unsigned int cluster; |
819 |
|
820 |
memset(&(s->first_sectors[0]),0,0x40*0x200); |
821 |
|
822 |
s->cluster_size=s->sectors_per_cluster*0x200;
|
823 |
s->cluster_buffer=malloc(s->cluster_size); |
824 |
assert(s->cluster_buffer); |
825 |
|
826 |
/*
|
827 |
* The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
828 |
* where sc is sector_count,
|
829 |
* spf is sectors_per_fat,
|
830 |
* spc is sectors_per_clusters, and
|
831 |
* fat_type = 12, 16 or 32.
|
832 |
*/
|
833 |
i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; |
834 |
s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
835 |
|
836 |
array_init(&(s->mapping),sizeof(mapping_t));
|
837 |
array_init(&(s->directory),sizeof(direntry_t));
|
838 |
|
839 |
/* add volume label */
|
840 |
{ |
841 |
direntry_t* entry=array_get_next(&(s->directory)); |
842 |
entry->attributes=0x28; /* archive | volume label */ |
843 |
snprintf(entry->name,11,"QEMU VVFAT"); |
844 |
} |
845 |
|
846 |
/* Now build FAT, and write back information into directory */
|
847 |
init_fat(s); |
848 |
|
849 |
s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
|
850 |
s->cluster_count=sector2cluster(s, s->sector_count); |
851 |
|
852 |
mapping = array_get_next(&(s->mapping)); |
853 |
mapping->begin = 0;
|
854 |
mapping->dir_index = 0;
|
855 |
mapping->info.dir.parent_mapping_index = -1;
|
856 |
mapping->first_mapping_index = -1;
|
857 |
mapping->path = strdup(dirname); |
858 |
i = strlen(mapping->path); |
859 |
if (i > 0 && mapping->path[i - 1] == '/') |
860 |
mapping->path[i - 1] = '\0'; |
861 |
mapping->mode = MODE_DIRECTORY; |
862 |
mapping->read_only = 0;
|
863 |
s->path = mapping->path; |
864 |
|
865 |
for (i = 0, cluster = 0; i < s->mapping.next; i++) { |
866 |
int j;
|
867 |
/* MS-DOS expects the FAT to be 0 for the root directory
|
868 |
* (except for the media byte). */
|
869 |
/* LATER TODO: still true for FAT32? */
|
870 |
int fix_fat = (i != 0); |
871 |
mapping = array_get(&(s->mapping), i); |
872 |
|
873 |
if (mapping->mode & MODE_DIRECTORY) {
|
874 |
mapping->begin = cluster; |
875 |
if(read_directory(s, i)) {
|
876 |
fprintf(stderr, "Could not read directory %s\n",
|
877 |
mapping->path); |
878 |
return -1; |
879 |
} |
880 |
mapping = array_get(&(s->mapping), i); |
881 |
} else {
|
882 |
assert(mapping->mode == MODE_UNDEFINED); |
883 |
mapping->mode=MODE_NORMAL; |
884 |
mapping->begin = cluster; |
885 |
if (mapping->end > 0) { |
886 |
direntry_t* direntry = array_get(&(s->directory), |
887 |
mapping->dir_index); |
888 |
|
889 |
mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; |
890 |
set_begin_of_direntry(direntry, mapping->begin); |
891 |
} else {
|
892 |
mapping->end = cluster + 1;
|
893 |
fix_fat = 0;
|
894 |
} |
895 |
} |
896 |
|
897 |
assert(mapping->begin < mapping->end); |
898 |
|
899 |
/* fix fat for entry */
|
900 |
if (fix_fat) {
|
901 |
for(j = mapping->begin; j < mapping->end - 1; j++) |
902 |
fat_set(s, j, j+1);
|
903 |
fat_set(s, mapping->end - 1, s->max_fat_value);
|
904 |
} |
905 |
|
906 |
/* next free cluster */
|
907 |
cluster = mapping->end; |
908 |
|
909 |
if(cluster > s->cluster_count) {
|
910 |
fprintf(stderr,"Directory does not fit in FAT%d\n",s->fat_type);
|
911 |
return -1; |
912 |
} |
913 |
} |
914 |
|
915 |
mapping = array_get(&(s->mapping), 0);
|
916 |
s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; |
917 |
s->last_cluster_of_root_directory = mapping->end; |
918 |
|
919 |
/* the FAT signature */
|
920 |
fat_set(s,0,s->max_fat_value);
|
921 |
fat_set(s,1,s->max_fat_value);
|
922 |
|
923 |
s->current_mapping = NULL;
|
924 |
|
925 |
bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
926 |
bootsector->jump[0]=0xeb; |
927 |
bootsector->jump[1]=0x3e; |
928 |
bootsector->jump[2]=0x90; |
929 |
memcpy(bootsector->name,"QEMU ",8); |
930 |
bootsector->sector_size=cpu_to_le16(0x200);
|
931 |
bootsector->sectors_per_cluster=s->sectors_per_cluster; |
932 |
bootsector->reserved_sectors=cpu_to_le16(1);
|
933 |
bootsector->number_of_fats=0x2; /* number of FATs */ |
934 |
bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
|
935 |
bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
936 |
bootsector->media_type=(s->fat_type!=12?0xf8:s->sector_count==5760?0xf9:0xf8); /* media descriptor */ |
937 |
s->fat.pointer[0] = bootsector->media_type;
|
938 |
bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
939 |
bootsector->sectors_per_track=cpu_to_le16(s->bs->secs); |
940 |
bootsector->number_of_heads=cpu_to_le16(s->bs->heads); |
941 |
bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
942 |
bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
943 |
|
944 |
/* LATER TODO: if FAT32, this is wrong */
|
945 |
bootsector->u.fat16.drive_number=s->fat_type==12?0:0x80; /* assume this is hda (TODO) */ |
946 |
bootsector->u.fat16.current_head=0;
|
947 |
bootsector->u.fat16.signature=0x29;
|
948 |
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
949 |
|
950 |
memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11); |
951 |
memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
952 |
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; |
953 |
|
954 |
return 0; |
955 |
} |
956 |
|
957 |
static BDRVVVFATState *vvv = NULL; |
958 |
|
959 |
static int enable_write_target(BDRVVVFATState *s); |
960 |
static int is_consistent(BDRVVVFATState *s); |
961 |
|
962 |
static int vvfat_open(BlockDriverState *bs, const char* dirname) |
963 |
{ |
964 |
BDRVVVFATState *s = bs->opaque; |
965 |
int floppy = 0; |
966 |
int i;
|
967 |
|
968 |
vvv = s; |
969 |
|
970 |
DLOG(if (stderr == NULL) { |
971 |
stderr = fopen("vvfat.log", "a"); |
972 |
setbuf(stderr, NULL);
|
973 |
}) |
974 |
|
975 |
s->bs = bs; |
976 |
|
977 |
s->fat_type=16;
|
978 |
/* LATER TODO: if FAT32, adjust */
|
979 |
s->sector_count=0xec04f;
|
980 |
s->sectors_per_cluster=0x10;
|
981 |
/* LATER TODO: this could be wrong for FAT32 */
|
982 |
bs->cyls=1023; bs->heads=15; bs->secs=63; |
983 |
|
984 |
s->current_cluster=0xffffffff;
|
985 |
|
986 |
s->first_sectors_number=0x40;
|
987 |
/* read only is the default for safety */
|
988 |
bs->read_only = 1;
|
989 |
s->qcow = s->write_target = NULL;
|
990 |
s->qcow_filename = NULL;
|
991 |
s->fat2 = NULL;
|
992 |
s->downcase_short_names = 1;
|
993 |
|
994 |
if (!strstart(dirname, "fat:", NULL)) |
995 |
return -1; |
996 |
|
997 |
if (strstr(dirname, ":rw:")) { |
998 |
if (enable_write_target(s))
|
999 |
return -1; |
1000 |
bs->read_only = 0;
|
1001 |
} |
1002 |
|
1003 |
if (strstr(dirname, ":floppy:")) { |
1004 |
floppy = 1;
|
1005 |
s->fat_type = 12;
|
1006 |
s->first_sectors_number = 1;
|
1007 |
s->sectors_per_cluster=2;
|
1008 |
bs->cyls = 80; bs->heads = 2; bs->secs = 36; |
1009 |
} |
1010 |
|
1011 |
if (strstr(dirname, ":32:")) { |
1012 |
fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
|
1013 |
s->fat_type = 32;
|
1014 |
} else if (strstr(dirname, ":16:")) { |
1015 |
s->fat_type = 16;
|
1016 |
} else if (strstr(dirname, ":12:")) { |
1017 |
s->fat_type = 12;
|
1018 |
s->sector_count=2880;
|
1019 |
} |
1020 |
|
1021 |
i = strrchr(dirname, ':') - dirname;
|
1022 |
assert(i >= 3);
|
1023 |
if (dirname[i-2] == ':' && isalpha(dirname[i-1])) |
1024 |
/* workaround for DOS drive names */
|
1025 |
dirname += i-1;
|
1026 |
else
|
1027 |
dirname += i+1;
|
1028 |
|
1029 |
bs->total_sectors=bs->cyls*bs->heads*bs->secs; |
1030 |
if (s->sector_count > bs->total_sectors)
|
1031 |
s->sector_count = bs->total_sectors; |
1032 |
if(init_directories(s, dirname))
|
1033 |
return -1; |
1034 |
|
1035 |
if(s->first_sectors_number==0x40) |
1036 |
init_mbr(s); |
1037 |
|
1038 |
/* for some reason or other, MS-DOS does not like to know about CHS... */
|
1039 |
if (floppy)
|
1040 |
bs->heads = bs->cyls = bs->secs = 0;
|
1041 |
|
1042 |
// assert(is_consistent(s));
|
1043 |
|
1044 |
return 0; |
1045 |
} |
1046 |
|
1047 |
static inline void vvfat_close_current_file(BDRVVVFATState *s) |
1048 |
{ |
1049 |
if(s->current_mapping) {
|
1050 |
s->current_mapping = NULL;
|
1051 |
if (s->current_fd) {
|
1052 |
close(s->current_fd); |
1053 |
s->current_fd = 0;
|
1054 |
} |
1055 |
} |
1056 |
s->current_cluster = -1;
|
1057 |
} |
1058 |
|
1059 |
/* mappings between index1 and index2-1 are supposed to be ordered
|
1060 |
* return value is the index of the last mapping for which end>cluster_num
|
1061 |
*/
|
1062 |
static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) |
1063 |
{ |
1064 |
int index3=index1+1; |
1065 |
while(1) { |
1066 |
mapping_t* mapping; |
1067 |
index3=(index1+index2)/2;
|
1068 |
mapping=array_get(&(s->mapping),index3); |
1069 |
assert(mapping->begin < mapping->end); |
1070 |
if(mapping->begin>=cluster_num) {
|
1071 |
assert(index2!=index3 || index2==0);
|
1072 |
if(index2==index3)
|
1073 |
return index1;
|
1074 |
index2=index3; |
1075 |
} else {
|
1076 |
if(index1==index3)
|
1077 |
return mapping->end<=cluster_num ? index2 : index1;
|
1078 |
index1=index3; |
1079 |
} |
1080 |
assert(index1<=index2); |
1081 |
DLOG(mapping=array_get(&(s->mapping),index1); |
1082 |
assert(mapping->begin<=cluster_num); |
1083 |
assert(index2 >= s->mapping.next || |
1084 |
((mapping = array_get(&(s->mapping),index2)) && |
1085 |
mapping->end>cluster_num))); |
1086 |
} |
1087 |
} |
1088 |
|
1089 |
static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
1090 |
{ |
1091 |
int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); |
1092 |
mapping_t* mapping; |
1093 |
if(index>=s->mapping.next)
|
1094 |
return 0; |
1095 |
mapping=array_get(&(s->mapping),index); |
1096 |
if(mapping->begin>cluster_num)
|
1097 |
return 0; |
1098 |
assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
1099 |
return mapping;
|
1100 |
} |
1101 |
|
1102 |
/*
|
1103 |
* This function simply compares path == mapping->path. Since the mappings
|
1104 |
* are sorted by cluster, this is expensive: O(n).
|
1105 |
*/
|
1106 |
static inline mapping_t* find_mapping_for_path(BDRVVVFATState* s, |
1107 |
const char* path) |
1108 |
{ |
1109 |
int i;
|
1110 |
|
1111 |
for (i = 0; i < s->mapping.next; i++) { |
1112 |
mapping_t* mapping = array_get(&(s->mapping), i); |
1113 |
if (mapping->first_mapping_index < 0 && |
1114 |
!strcmp(path, mapping->path)) |
1115 |
return mapping;
|
1116 |
} |
1117 |
|
1118 |
return NULL; |
1119 |
} |
1120 |
|
1121 |
static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
1122 |
{ |
1123 |
if(!mapping)
|
1124 |
return -1; |
1125 |
if(!s->current_mapping ||
|
1126 |
strcmp(s->current_mapping->path,mapping->path)) { |
1127 |
/* open file */
|
1128 |
int fd = open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
1129 |
if(fd<0) |
1130 |
return -1; |
1131 |
vvfat_close_current_file(s); |
1132 |
s->current_fd = fd; |
1133 |
s->current_mapping = mapping; |
1134 |
} |
1135 |
return 0; |
1136 |
} |
1137 |
|
1138 |
static inline int read_cluster(BDRVVVFATState *s,int cluster_num) |
1139 |
{ |
1140 |
if(s->current_cluster != cluster_num) {
|
1141 |
int result=0; |
1142 |
off_t offset; |
1143 |
assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
1144 |
if(!s->current_mapping
|
1145 |
|| s->current_mapping->begin>cluster_num |
1146 |
|| s->current_mapping->end<=cluster_num) { |
1147 |
/* binary search of mappings for file */
|
1148 |
mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
1149 |
|
1150 |
assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); |
1151 |
|
1152 |
if (mapping && mapping->mode & MODE_DIRECTORY) {
|
1153 |
vvfat_close_current_file(s); |
1154 |
s->current_mapping = mapping; |
1155 |
read_cluster_directory:
|
1156 |
offset = s->cluster_size*(cluster_num-s->current_mapping->begin); |
1157 |
s->cluster = s->directory.pointer+offset |
1158 |
+ 0x20*s->current_mapping->info.dir.first_dir_index;
|
1159 |
assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); |
1160 |
assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
1161 |
s->current_cluster = cluster_num; |
1162 |
return 0; |
1163 |
} |
1164 |
|
1165 |
if(open_file(s,mapping))
|
1166 |
return -2; |
1167 |
} else if (s->current_mapping->mode & MODE_DIRECTORY) |
1168 |
goto read_cluster_directory;
|
1169 |
|
1170 |
assert(s->current_fd); |
1171 |
|
1172 |
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; |
1173 |
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
1174 |
return -3; |
1175 |
s->cluster=s->cluster_buffer; |
1176 |
result=read(s->current_fd,s->cluster,s->cluster_size); |
1177 |
if(result<0) { |
1178 |
s->current_cluster = -1;
|
1179 |
return -1; |
1180 |
} |
1181 |
s->current_cluster = cluster_num; |
1182 |
} |
1183 |
return 0; |
1184 |
} |
1185 |
|
1186 |
#ifdef DEBUG
|
1187 |
static void hexdump(const void* address, uint32_t len) |
1188 |
{ |
1189 |
const unsigned char* p = address; |
1190 |
int i, j;
|
1191 |
|
1192 |
for (i = 0; i < len; i += 16) { |
1193 |
for (j = 0; j < 16 && i + j < len; j++) |
1194 |
fprintf(stderr, "%02x ", p[i + j]);
|
1195 |
for (; j < 16; j++) |
1196 |
fprintf(stderr, " ");
|
1197 |
fprintf(stderr, " ");
|
1198 |
for (j = 0; j < 16 && i + j < len; j++) |
1199 |
fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]); |
1200 |
fprintf(stderr, "\n");
|
1201 |
} |
1202 |
} |
1203 |
|
1204 |
static void print_direntry(const direntry_t* direntry) |
1205 |
{ |
1206 |
int j = 0; |
1207 |
char buffer[1024]; |
1208 |
|
1209 |
fprintf(stderr, "direntry 0x%x: ", (int)direntry); |
1210 |
if(!direntry)
|
1211 |
return;
|
1212 |
if(is_long_name(direntry)) {
|
1213 |
unsigned char* c=(unsigned char*)direntry; |
1214 |
int i;
|
1215 |
for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) |
1216 |
#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = '?'; j++;} |
1217 |
ADD_CHAR(c[i]); |
1218 |
for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
1219 |
ADD_CHAR(c[i]); |
1220 |
for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
1221 |
ADD_CHAR(c[i]); |
1222 |
buffer[j] = 0;
|
1223 |
fprintf(stderr, "%s\n", buffer);
|
1224 |
} else {
|
1225 |
int i;
|
1226 |
for(i=0;i<11;i++) |
1227 |
ADD_CHAR(direntry->name[i]); |
1228 |
buffer[j] = 0;
|
1229 |
fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
1230 |
buffer, |
1231 |
direntry->attributes, |
1232 |
begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
1233 |
} |
1234 |
} |
1235 |
|
1236 |
static void print_mapping(const mapping_t* mapping) |
1237 |
{ |
1238 |
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); |
1239 |
if (mapping->mode & MODE_DIRECTORY)
|
1240 |
fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
1241 |
else
|
1242 |
fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
1243 |
} |
1244 |
#endif
|
1245 |
|
1246 |
static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
1247 |
uint8_t *buf, int nb_sectors)
|
1248 |
{ |
1249 |
BDRVVVFATState *s = bs->opaque; |
1250 |
int i;
|
1251 |
|
1252 |
for(i=0;i<nb_sectors;i++,sector_num++) { |
1253 |
if (sector_num >= s->sector_count)
|
1254 |
return -1; |
1255 |
if (s->qcow) {
|
1256 |
int n;
|
1257 |
if (s->qcow->drv->bdrv_is_allocated(s->qcow,
|
1258 |
sector_num, nb_sectors-i, &n)) { |
1259 |
DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
1260 |
if (s->qcow->drv->bdrv_read(s->qcow, sector_num, buf+i*0x200, n)) |
1261 |
return -1; |
1262 |
i += n - 1;
|
1263 |
sector_num += n - 1;
|
1264 |
continue;
|
1265 |
} |
1266 |
DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
1267 |
} |
1268 |
if(sector_num<s->faked_sectors) {
|
1269 |
if(sector_num<s->first_sectors_number)
|
1270 |
memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); |
1271 |
else if(sector_num-s->first_sectors_number<s->sectors_per_fat) |
1272 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); |
1273 |
else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) |
1274 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); |
1275 |
} else {
|
1276 |
uint32_t sector=sector_num-s->faked_sectors, |
1277 |
sector_offset_in_cluster=(sector%s->sectors_per_cluster), |
1278 |
cluster_num=sector/s->sectors_per_cluster; |
1279 |
if(read_cluster(s, cluster_num) != 0) { |
1280 |
/* LATER TODO: strict: return -1; */
|
1281 |
memset(buf+i*0x200,0,0x200); |
1282 |
continue;
|
1283 |
} |
1284 |
memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
1285 |
} |
1286 |
} |
1287 |
return 0; |
1288 |
} |
1289 |
|
1290 |
/* LATER TODO: statify all functions */
|
1291 |
|
1292 |
/*
|
1293 |
* Idea of the write support (use snapshot):
|
1294 |
*
|
1295 |
* 1. check if all data is consistent, recording renames, modifications,
|
1296 |
* new files and directories (in s->commits).
|
1297 |
*
|
1298 |
* 2. if the data is not consistent, stop committing
|
1299 |
*
|
1300 |
* 3. handle renames, and create new files and directories (do not yet
|
1301 |
* write their contents)
|
1302 |
*
|
1303 |
* 4. walk the directories, fixing the mapping and direntries, and marking
|
1304 |
* the handled mappings as not deleted
|
1305 |
*
|
1306 |
* 5. commit the contents of the files
|
1307 |
*
|
1308 |
* 6. handle deleted files and directories
|
1309 |
*
|
1310 |
*/
|
1311 |
|
1312 |
typedef struct commit_t { |
1313 |
char* path;
|
1314 |
union {
|
1315 |
struct { uint32_t cluster; } rename;
|
1316 |
struct { int dir_index; uint32_t modified_offset; } writeout; |
1317 |
struct { uint32_t first_cluster; } new_file;
|
1318 |
struct { uint32_t cluster; } mkdir;
|
1319 |
} param; |
1320 |
/* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
1321 |
enum {
|
1322 |
ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR |
1323 |
} action; |
1324 |
} commit_t; |
1325 |
|
1326 |
static void clear_commits(BDRVVVFATState* s) |
1327 |
{ |
1328 |
int i;
|
1329 |
DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
1330 |
for (i = 0; i < s->commits.next; i++) { |
1331 |
commit_t* commit = array_get(&(s->commits), i); |
1332 |
assert(commit->path || commit->action == ACTION_WRITEOUT); |
1333 |
if (commit->action != ACTION_WRITEOUT) {
|
1334 |
assert(commit->path); |
1335 |
free(commit->path); |
1336 |
} else
|
1337 |
assert(commit->path == NULL);
|
1338 |
} |
1339 |
s->commits.next = 0;
|
1340 |
} |
1341 |
|
1342 |
static void schedule_rename(BDRVVVFATState* s, |
1343 |
uint32_t cluster, char* new_path)
|
1344 |
{ |
1345 |
commit_t* commit = array_get_next(&(s->commits)); |
1346 |
commit->path = new_path; |
1347 |
commit->param.rename.cluster = cluster; |
1348 |
commit->action = ACTION_RENAME; |
1349 |
} |
1350 |
|
1351 |
static void schedule_writeout(BDRVVVFATState* s, |
1352 |
int dir_index, uint32_t modified_offset)
|
1353 |
{ |
1354 |
commit_t* commit = array_get_next(&(s->commits)); |
1355 |
commit->path = NULL;
|
1356 |
commit->param.writeout.dir_index = dir_index; |
1357 |
commit->param.writeout.modified_offset = modified_offset; |
1358 |
commit->action = ACTION_WRITEOUT; |
1359 |
} |
1360 |
|
1361 |
static void schedule_new_file(BDRVVVFATState* s, |
1362 |
char* path, uint32_t first_cluster)
|
1363 |
{ |
1364 |
commit_t* commit = array_get_next(&(s->commits)); |
1365 |
commit->path = path; |
1366 |
commit->param.new_file.first_cluster = first_cluster; |
1367 |
commit->action = ACTION_NEW_FILE; |
1368 |
} |
1369 |
|
1370 |
static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) |
1371 |
{ |
1372 |
commit_t* commit = array_get_next(&(s->commits)); |
1373 |
commit->path = path; |
1374 |
commit->param.mkdir.cluster = cluster; |
1375 |
commit->action = ACTION_MKDIR; |
1376 |
} |
1377 |
|
1378 |
typedef struct { |
1379 |
unsigned char name[1024]; |
1380 |
int checksum, len;
|
1381 |
int sequence_number;
|
1382 |
} long_file_name; |
1383 |
|
1384 |
static void lfn_init(long_file_name* lfn) |
1385 |
{ |
1386 |
lfn->sequence_number = lfn->len = 0;
|
1387 |
lfn->checksum = 0x100;
|
1388 |
} |
1389 |
|
1390 |
/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
1391 |
static int parse_long_name(long_file_name* lfn, |
1392 |
const direntry_t* direntry)
|
1393 |
{ |
1394 |
int i, j, offset;
|
1395 |
const unsigned char* pointer = (const unsigned char*)direntry; |
1396 |
|
1397 |
if (!is_long_name(direntry))
|
1398 |
return 1; |
1399 |
|
1400 |
if (pointer[0] & 0x40) { |
1401 |
lfn->sequence_number = pointer[0] & 0x3f; |
1402 |
lfn->checksum = pointer[13];
|
1403 |
lfn->name[0] = 0; |
1404 |
} else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
1405 |
return -1; |
1406 |
else if (pointer[13] != lfn->checksum) |
1407 |
return -2; |
1408 |
else if (pointer[12] || pointer[26] || pointer[27]) |
1409 |
return -3; |
1410 |
|
1411 |
offset = 13 * (lfn->sequence_number - 1); |
1412 |
for (i = 0, j = 1; i < 13; i++, j+=2) { |
1413 |
if (j == 11) |
1414 |
j = 14;
|
1415 |
else if (j == 26) |
1416 |
j = 28;
|
1417 |
|
1418 |
if (pointer[j+1] == 0) |
1419 |
lfn->name[offset + i] = pointer[j]; |
1420 |
else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) |
1421 |
return -4; |
1422 |
else
|
1423 |
lfn->name[offset + i] = 0;
|
1424 |
} |
1425 |
|
1426 |
if (pointer[0] & 0x40) |
1427 |
lfn->len = offset + strlen(lfn->name + offset); |
1428 |
|
1429 |
return 0; |
1430 |
} |
1431 |
|
1432 |
/* returns 0 if successful, >0 if no short_name, and <0 on error */
|
1433 |
static int parse_short_name(BDRVVVFATState* s, |
1434 |
long_file_name* lfn, direntry_t* direntry) |
1435 |
{ |
1436 |
int i, j;
|
1437 |
|
1438 |
if (!is_short_name(direntry))
|
1439 |
return 1; |
1440 |
|
1441 |
for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); |
1442 |
for (i = 0; i <= j; i++) { |
1443 |
if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) |
1444 |
return -1; |
1445 |
else if (s->downcase_short_names) |
1446 |
lfn->name[i] = tolower(direntry->name[i]); |
1447 |
else
|
1448 |
lfn->name[i] = direntry->name[i]; |
1449 |
} |
1450 |
|
1451 |
for (j = 2; j >= 0 && direntry->extension[j] == ' '; j--); |
1452 |
if (j >= 0) { |
1453 |
lfn->name[i++] = '.';
|
1454 |
lfn->name[i + j + 1] = '\0'; |
1455 |
for (;j >= 0; j--) { |
1456 |
if (direntry->extension[j] <= ' ' || direntry->extension[j] > 0x7f) |
1457 |
return -2; |
1458 |
else if (s->downcase_short_names) |
1459 |
lfn->name[i + j] = tolower(direntry->extension[j]); |
1460 |
else
|
1461 |
lfn->name[i + j] = direntry->extension[j]; |
1462 |
} |
1463 |
} else
|
1464 |
lfn->name[i + j + 1] = '\0'; |
1465 |
|
1466 |
lfn->len = strlen(lfn->name); |
1467 |
|
1468 |
return 0; |
1469 |
} |
1470 |
|
1471 |
static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
1472 |
unsigned int cluster) |
1473 |
{ |
1474 |
if (cluster < s->last_cluster_of_root_directory) {
|
1475 |
if (cluster + 1 == s->last_cluster_of_root_directory) |
1476 |
return s->max_fat_value;
|
1477 |
else
|
1478 |
return cluster + 1; |
1479 |
} |
1480 |
|
1481 |
if (s->fat_type==32) { |
1482 |
uint32_t* entry=((uint32_t*)s->fat2)+cluster; |
1483 |
return le32_to_cpu(*entry);
|
1484 |
} else if (s->fat_type==16) { |
1485 |
uint16_t* entry=((uint16_t*)s->fat2)+cluster; |
1486 |
return le16_to_cpu(*entry);
|
1487 |
} else {
|
1488 |
const uint8_t* x=s->fat2+cluster*3/2; |
1489 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
1490 |
} |
1491 |
} |
1492 |
|
1493 |
static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) |
1494 |
{ |
1495 |
int was_modified = 0; |
1496 |
int i, dummy;
|
1497 |
|
1498 |
if (s->qcow == NULL) |
1499 |
return 0; |
1500 |
|
1501 |
for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) |
1502 |
was_modified = s->qcow->drv->bdrv_is_allocated(s->qcow, |
1503 |
cluster2sector(s, cluster_num) + i, 1, &dummy);
|
1504 |
|
1505 |
return was_modified;
|
1506 |
} |
1507 |
|
1508 |
static const char* get_basename(const char* path) |
1509 |
{ |
1510 |
char* basename = strrchr(path, '/'); |
1511 |
if (basename == NULL) |
1512 |
return path;
|
1513 |
else
|
1514 |
return basename + 1; /* strip '/' */ |
1515 |
} |
1516 |
|
1517 |
/*
|
1518 |
* The array s->used_clusters holds the states of the clusters. If it is
|
1519 |
* part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
1520 |
* was modified, bit 3 is set.
|
1521 |
* If any cluster is allocated, but not part of a file or directory, this
|
1522 |
* driver refuses to commit.
|
1523 |
*/
|
1524 |
typedef enum { |
1525 |
USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 |
1526 |
} used_t; |
1527 |
|
1528 |
/*
|
1529 |
* get_cluster_count_for_direntry() not only determines how many clusters
|
1530 |
* are occupied by direntry, but also if it was renamed or modified.
|
1531 |
*
|
1532 |
* A file is thought to be renamed *only* if there already was a file with
|
1533 |
* exactly the same first cluster, but a different name.
|
1534 |
*
|
1535 |
* Further, the files/directories handled by this function are
|
1536 |
* assumed to be *not* deleted (and *only* those).
|
1537 |
*/
|
1538 |
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
1539 |
direntry_t* direntry, const char* path) |
1540 |
{ |
1541 |
/*
|
1542 |
* This is a little bit tricky:
|
1543 |
* IF the guest OS just inserts a cluster into the file chain,
|
1544 |
* and leaves the rest alone, (i.e. the original file had clusters
|
1545 |
* 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
1546 |
*
|
1547 |
* - do_commit will write the cluster into the file at the given
|
1548 |
* offset, but
|
1549 |
*
|
1550 |
* - the cluster which is overwritten should be moved to a later
|
1551 |
* position in the file.
|
1552 |
*
|
1553 |
* I am not aware that any OS does something as braindead, but this
|
1554 |
* situation could happen anyway when not committing for a long time.
|
1555 |
* Just to be sure that this does not bite us, detect it, and copy the
|
1556 |
* contents of the clusters to-be-overwritten into the qcow.
|
1557 |
*/
|
1558 |
int copy_it = 0; |
1559 |
int was_modified = 0; |
1560 |
int32_t ret = 0;
|
1561 |
|
1562 |
uint32_t cluster_num = begin_of_direntry(direntry); |
1563 |
uint32_t offset = 0;
|
1564 |
int first_mapping_index = -1; |
1565 |
mapping_t* mapping = NULL;
|
1566 |
const char* basename2 = NULL; |
1567 |
|
1568 |
vvfat_close_current_file(s); |
1569 |
|
1570 |
/* the root directory */
|
1571 |
if (cluster_num == 0) |
1572 |
return 0; |
1573 |
|
1574 |
/* write support */
|
1575 |
if (s->qcow) {
|
1576 |
basename2 = get_basename(path); |
1577 |
|
1578 |
mapping = find_mapping_for_cluster(s, cluster_num); |
1579 |
|
1580 |
if (mapping) {
|
1581 |
const char* basename; |
1582 |
|
1583 |
assert(mapping->mode & MODE_DELETED); |
1584 |
mapping->mode &= ~MODE_DELETED; |
1585 |
|
1586 |
basename = get_basename(mapping->path); |
1587 |
|
1588 |
assert(mapping->mode & MODE_NORMAL); |
1589 |
|
1590 |
/* rename */
|
1591 |
if (strcmp(basename, basename2))
|
1592 |
schedule_rename(s, cluster_num, strdup(path)); |
1593 |
} else if (is_file(direntry)) |
1594 |
/* new file */
|
1595 |
schedule_new_file(s, strdup(path), cluster_num); |
1596 |
else {
|
1597 |
assert(0);
|
1598 |
return 0; |
1599 |
} |
1600 |
} |
1601 |
|
1602 |
while(1) { |
1603 |
if (s->qcow) {
|
1604 |
if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
1605 |
if (mapping == NULL || |
1606 |
mapping->begin > cluster_num || |
1607 |
mapping->end <= cluster_num) |
1608 |
mapping = find_mapping_for_cluster(s, cluster_num); |
1609 |
|
1610 |
|
1611 |
if (mapping &&
|
1612 |
(mapping->mode & MODE_DIRECTORY) == 0) {
|
1613 |
|
1614 |
/* was modified in qcow */
|
1615 |
if (offset != mapping->info.file.offset + s->cluster_size
|
1616 |
* (cluster_num - mapping->begin)) { |
1617 |
/* offset of this cluster in file chain has changed */
|
1618 |
assert(0);
|
1619 |
copy_it = 1;
|
1620 |
} else if (offset == 0) { |
1621 |
const char* basename = get_basename(mapping->path); |
1622 |
|
1623 |
if (strcmp(basename, basename2))
|
1624 |
copy_it = 1;
|
1625 |
first_mapping_index = array_index(&(s->mapping), mapping); |
1626 |
} |
1627 |
|
1628 |
if (mapping->first_mapping_index != first_mapping_index
|
1629 |
&& mapping->info.file.offset > 0) {
|
1630 |
assert(0);
|
1631 |
copy_it = 1;
|
1632 |
} |
1633 |
|
1634 |
/* need to write out? */
|
1635 |
if (!was_modified && is_file(direntry)) {
|
1636 |
was_modified = 1;
|
1637 |
schedule_writeout(s, mapping->dir_index, offset); |
1638 |
} |
1639 |
} |
1640 |
} |
1641 |
|
1642 |
if (copy_it) {
|
1643 |
int i, dummy;
|
1644 |
/*
|
1645 |
* This is horribly inefficient, but that is okay, since
|
1646 |
* it is rarely executed, if at all.
|
1647 |
*/
|
1648 |
int64_t offset = cluster2sector(s, cluster_num); |
1649 |
|
1650 |
vvfat_close_current_file(s); |
1651 |
for (i = 0; i < s->sectors_per_cluster; i++) |
1652 |
if (!s->qcow->drv->bdrv_is_allocated(s->qcow,
|
1653 |
offset + i, 1, &dummy)) {
|
1654 |
if (vvfat_read(s->bs,
|
1655 |
offset, s->cluster_buffer, 1))
|
1656 |
return -1; |
1657 |
if (s->qcow->drv->bdrv_write(s->qcow,
|
1658 |
offset, s->cluster_buffer, 1))
|
1659 |
return -2; |
1660 |
} |
1661 |
} |
1662 |
} |
1663 |
|
1664 |
ret++; |
1665 |
if (s->used_clusters[cluster_num] & USED_ANY)
|
1666 |
return 0; |
1667 |
s->used_clusters[cluster_num] = USED_FILE; |
1668 |
|
1669 |
cluster_num = modified_fat_get(s, cluster_num); |
1670 |
|
1671 |
if (fat_eof(s, cluster_num))
|
1672 |
return ret;
|
1673 |
else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) |
1674 |
return -1; |
1675 |
|
1676 |
offset += s->cluster_size; |
1677 |
} |
1678 |
} |
1679 |
|
1680 |
/*
|
1681 |
* This function looks at the modified data (qcow).
|
1682 |
* It returns 0 upon inconsistency or error, and the number of clusters
|
1683 |
* used by the directory, its subdirectories and their files.
|
1684 |
*/
|
1685 |
static int check_directory_consistency(BDRVVVFATState *s, |
1686 |
int cluster_num, const char* path) |
1687 |
{ |
1688 |
int ret = 0; |
1689 |
unsigned char* cluster = malloc(s->cluster_size); |
1690 |
direntry_t* direntries = (direntry_t*)cluster; |
1691 |
mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); |
1692 |
|
1693 |
long_file_name lfn; |
1694 |
int path_len = strlen(path);
|
1695 |
char path2[PATH_MAX];
|
1696 |
|
1697 |
assert(path_len < PATH_MAX); /* len was tested before! */
|
1698 |
strcpy(path2, path); |
1699 |
path2[path_len] = '/';
|
1700 |
path2[path_len + 1] = '\0'; |
1701 |
|
1702 |
if (mapping) {
|
1703 |
const char* basename = get_basename(mapping->path); |
1704 |
const char* basename2 = get_basename(path); |
1705 |
|
1706 |
assert(mapping->mode & MODE_DIRECTORY); |
1707 |
|
1708 |
assert(mapping->mode & MODE_DELETED); |
1709 |
mapping->mode &= ~MODE_DELETED; |
1710 |
|
1711 |
if (strcmp(basename, basename2))
|
1712 |
schedule_rename(s, cluster_num, strdup(path)); |
1713 |
} else
|
1714 |
/* new directory */
|
1715 |
schedule_mkdir(s, cluster_num, strdup(path)); |
1716 |
|
1717 |
lfn_init(&lfn); |
1718 |
do {
|
1719 |
int i;
|
1720 |
int subret = 0; |
1721 |
|
1722 |
ret++; |
1723 |
|
1724 |
if (s->used_clusters[cluster_num] & USED_ANY) {
|
1725 |
fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); |
1726 |
return 0; |
1727 |
} |
1728 |
s->used_clusters[cluster_num] = USED_DIRECTORY; |
1729 |
|
1730 |
DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); |
1731 |
subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, |
1732 |
s->sectors_per_cluster); |
1733 |
if (subret) {
|
1734 |
fprintf(stderr, "Error fetching direntries\n");
|
1735 |
fail:
|
1736 |
free(cluster); |
1737 |
return 0; |
1738 |
} |
1739 |
|
1740 |
for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { |
1741 |
int cluster_count;
|
1742 |
|
1743 |
DLOG(fprintf(stderr, "check direntry %d: \n", i); print_direntry(direntries + i));
|
1744 |
if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
1745 |
is_free(direntries + i)) |
1746 |
continue;
|
1747 |
|
1748 |
subret = parse_long_name(&lfn, direntries + i); |
1749 |
if (subret < 0) { |
1750 |
fprintf(stderr, "Error in long name\n");
|
1751 |
goto fail;
|
1752 |
} |
1753 |
if (subret == 0 || is_free(direntries + i)) |
1754 |
continue;
|
1755 |
|
1756 |
if (fat_chksum(direntries+i) != lfn.checksum) {
|
1757 |
subret = parse_short_name(s, &lfn, direntries + i); |
1758 |
if (subret < 0) { |
1759 |
fprintf(stderr, "Error in short name (%d)\n", subret);
|
1760 |
goto fail;
|
1761 |
} |
1762 |
if (subret > 0 || !strcmp(lfn.name, ".") |
1763 |
|| !strcmp(lfn.name, ".."))
|
1764 |
continue;
|
1765 |
} |
1766 |
lfn.checksum = 0x100; /* cannot use long name twice */ |
1767 |
|
1768 |
if (path_len + 1 + lfn.len >= PATH_MAX) { |
1769 |
fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
1770 |
goto fail;
|
1771 |
} |
1772 |
strcpy(path2 + path_len + 1, lfn.name);
|
1773 |
|
1774 |
if (is_directory(direntries + i)) {
|
1775 |
if (begin_of_direntry(direntries + i) == 0) { |
1776 |
DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
1777 |
goto fail;
|
1778 |
} |
1779 |
cluster_count = check_directory_consistency(s, |
1780 |
begin_of_direntry(direntries + i), path2); |
1781 |
if (cluster_count == 0) { |
1782 |
DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
1783 |
goto fail;
|
1784 |
} |
1785 |
} else if (is_file(direntries + i)) { |
1786 |
/* check file size with FAT */
|
1787 |
cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); |
1788 |
if (cluster_count !=
|
1789 |
(le32_to_cpu(direntries[i].size) + s->cluster_size |
1790 |
- 1) / s->cluster_size) {
|
1791 |
DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
1792 |
goto fail;
|
1793 |
} |
1794 |
} else
|
1795 |
assert(0); /* cluster_count = 0; */ |
1796 |
|
1797 |
ret += cluster_count; |
1798 |
} |
1799 |
|
1800 |
cluster_num = modified_fat_get(s, cluster_num); |
1801 |
} while(!fat_eof(s, cluster_num));
|
1802 |
|
1803 |
free(cluster); |
1804 |
return ret;
|
1805 |
} |
1806 |
|
1807 |
/* returns 1 on success */
|
1808 |
static int is_consistent(BDRVVVFATState* s) |
1809 |
{ |
1810 |
int i, check;
|
1811 |
int used_clusters_count = 0; |
1812 |
|
1813 |
DLOG(checkpoint()); |
1814 |
/*
|
1815 |
* - get modified FAT
|
1816 |
* - compare the two FATs (TODO)
|
1817 |
* - get buffer for marking used clusters
|
1818 |
* - recurse direntries from root (using bs->bdrv_read to make
|
1819 |
* sure to get the new data)
|
1820 |
* - check that the FAT agrees with the size
|
1821 |
* - count the number of clusters occupied by this directory and
|
1822 |
* its files
|
1823 |
* - check that the cumulative used cluster count agrees with the
|
1824 |
* FAT
|
1825 |
* - if all is fine, return number of used clusters
|
1826 |
*/
|
1827 |
if (s->fat2 == NULL) { |
1828 |
int size = 0x200 * s->sectors_per_fat; |
1829 |
s->fat2 = malloc(size); |
1830 |
memcpy(s->fat2, s->fat.pointer, size); |
1831 |
} |
1832 |
check = vvfat_read(s->bs, |
1833 |
s->first_sectors_number, s->fat2, s->sectors_per_fat); |
1834 |
if (check) {
|
1835 |
fprintf(stderr, "Could not copy fat\n");
|
1836 |
return 0; |
1837 |
} |
1838 |
assert (s->used_clusters); |
1839 |
for (i = 0; i < sector2cluster(s, s->sector_count); i++) |
1840 |
s->used_clusters[i] &= ~USED_ANY; |
1841 |
|
1842 |
clear_commits(s); |
1843 |
|
1844 |
/* mark every mapped file/directory as deleted.
|
1845 |
* (check_directory_consistency() will unmark those still present). */
|
1846 |
if (s->qcow)
|
1847 |
for (i = 0; i < s->mapping.next; i++) { |
1848 |
mapping_t* mapping = array_get(&(s->mapping), i); |
1849 |
if (mapping->first_mapping_index < 0) |
1850 |
mapping->mode |= MODE_DELETED; |
1851 |
} |
1852 |
|
1853 |
used_clusters_count = check_directory_consistency(s, 0, s->path);
|
1854 |
if (used_clusters_count <= 0) { |
1855 |
DLOG(fprintf(stderr, "problem in directory\n"));
|
1856 |
return 0; |
1857 |
} |
1858 |
|
1859 |
check = s->last_cluster_of_root_directory; |
1860 |
for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
1861 |
if (modified_fat_get(s, i)) {
|
1862 |
if(!s->used_clusters[i]) {
|
1863 |
DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
1864 |
return 0; |
1865 |
} |
1866 |
check++; |
1867 |
} |
1868 |
|
1869 |
if (s->used_clusters[i] == USED_ALLOCATED) {
|
1870 |
/* allocated, but not used... */
|
1871 |
DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
1872 |
return 0; |
1873 |
} |
1874 |
} |
1875 |
|
1876 |
if (check != used_clusters_count)
|
1877 |
return 0; |
1878 |
|
1879 |
return used_clusters_count;
|
1880 |
} |
1881 |
|
1882 |
static inline void adjust_mapping_indices(BDRVVVFATState* s, |
1883 |
int offset, int adjust) |
1884 |
{ |
1885 |
int i;
|
1886 |
|
1887 |
for (i = 0; i < s->mapping.next; i++) { |
1888 |
mapping_t* mapping = array_get(&(s->mapping), i); |
1889 |
|
1890 |
#define ADJUST_MAPPING_INDEX(name) \
|
1891 |
if (mapping->name >= offset) \
|
1892 |
mapping->name += adjust |
1893 |
|
1894 |
ADJUST_MAPPING_INDEX(first_mapping_index); |
1895 |
if (mapping->mode & MODE_DIRECTORY)
|
1896 |
ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); |
1897 |
} |
1898 |
} |
1899 |
|
1900 |
/* insert or update mapping */
|
1901 |
static mapping_t* insert_mapping(BDRVVVFATState* s,
|
1902 |
uint32_t begin, uint32_t end) |
1903 |
{ |
1904 |
/*
|
1905 |
* - find mapping where mapping->begin >= begin,
|
1906 |
* - if mapping->begin > begin: insert
|
1907 |
* - adjust all references to mappings!
|
1908 |
* - else: adjust
|
1909 |
* - replace name
|
1910 |
*/
|
1911 |
int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); |
1912 |
mapping_t* mapping = NULL;
|
1913 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
1914 |
|
1915 |
if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
1916 |
&& mapping->begin < begin) { |
1917 |
mapping->end = begin; |
1918 |
index++; |
1919 |
mapping = array_get(&(s->mapping), index); |
1920 |
} |
1921 |
if (index >= s->mapping.next || mapping->begin > begin) {
|
1922 |
mapping = array_insert(&(s->mapping), index, 1);
|
1923 |
mapping->path = NULL;
|
1924 |
adjust_mapping_indices(s, index, +1);
|
1925 |
} |
1926 |
|
1927 |
mapping->begin = begin; |
1928 |
mapping->end = end; |
1929 |
|
1930 |
DLOG(mapping_t* next_mapping; |
1931 |
assert(index + 1 >= s->mapping.next ||
|
1932 |
((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
1933 |
next_mapping->begin >= end))); |
1934 |
|
1935 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
1936 |
s->current_mapping = array_get(&(s->mapping), |
1937 |
s->current_mapping - first_mapping); |
1938 |
|
1939 |
return mapping;
|
1940 |
} |
1941 |
|
1942 |
static int remove_mapping(BDRVVVFATState* s, int mapping_index) |
1943 |
{ |
1944 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
1945 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
1946 |
|
1947 |
/* free mapping */
|
1948 |
if (mapping->first_mapping_index < 0) |
1949 |
free(mapping->path); |
1950 |
|
1951 |
/* remove from s->mapping */
|
1952 |
array_remove(&(s->mapping), mapping_index); |
1953 |
|
1954 |
/* adjust all references to mappings */
|
1955 |
adjust_mapping_indices(s, mapping_index, -1);
|
1956 |
|
1957 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
1958 |
s->current_mapping = array_get(&(s->mapping), |
1959 |
s->current_mapping - first_mapping); |
1960 |
|
1961 |
return 0; |
1962 |
} |
1963 |
|
1964 |
static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
1965 |
{ |
1966 |
int i;
|
1967 |
for (i = 0; i < s->mapping.next; i++) { |
1968 |
mapping_t* mapping = array_get(&(s->mapping), i); |
1969 |
if (mapping->dir_index >= offset)
|
1970 |
mapping->dir_index += adjust; |
1971 |
if ((mapping->mode & MODE_DIRECTORY) &&
|
1972 |
mapping->info.dir.first_dir_index >= offset) |
1973 |
mapping->info.dir.first_dir_index += adjust; |
1974 |
} |
1975 |
} |
1976 |
|
1977 |
static direntry_t* insert_direntries(BDRVVVFATState* s,
|
1978 |
int dir_index, int count) |
1979 |
{ |
1980 |
/*
|
1981 |
* make room in s->directory,
|
1982 |
* adjust_dirindices
|
1983 |
*/
|
1984 |
direntry_t* result = array_insert(&(s->directory), dir_index, count); |
1985 |
if (result == NULL) |
1986 |
return NULL; |
1987 |
adjust_dirindices(s, dir_index, count); |
1988 |
return result;
|
1989 |
} |
1990 |
|
1991 |
static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
1992 |
{ |
1993 |
int ret = array_remove_slice(&(s->directory), dir_index, count);
|
1994 |
if (ret)
|
1995 |
return ret;
|
1996 |
adjust_dirindices(s, dir_index, -count); |
1997 |
return 0; |
1998 |
} |
1999 |
|
2000 |
/*
|
2001 |
* Adapt the mappings of the cluster chain starting at first cluster
|
2002 |
* (i.e. if a file starts at first_cluster, the chain is followed according
|
2003 |
* to the modified fat, and the corresponding entries in s->mapping are
|
2004 |
* adjusted)
|
2005 |
*/
|
2006 |
static int commit_mappings(BDRVVVFATState* s, |
2007 |
uint32_t first_cluster, int dir_index)
|
2008 |
{ |
2009 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2010 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2011 |
uint32_t cluster = first_cluster; |
2012 |
|
2013 |
vvfat_close_current_file(s); |
2014 |
|
2015 |
assert(mapping); |
2016 |
assert(mapping->begin == first_cluster); |
2017 |
mapping->first_mapping_index = -1;
|
2018 |
mapping->dir_index = dir_index; |
2019 |
mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
2020 |
MODE_DIRECTORY : MODE_NORMAL; |
2021 |
|
2022 |
while (!fat_eof(s, cluster)) {
|
2023 |
uint32_t c, c1; |
2024 |
|
2025 |
for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; |
2026 |
c = c1, c1 = modified_fat_get(s, c1)); |
2027 |
|
2028 |
c++; |
2029 |
if (c > mapping->end) {
|
2030 |
int index = array_index(&(s->mapping), mapping);
|
2031 |
int i, max_i = s->mapping.next - index;
|
2032 |
for (i = 1; i < max_i && mapping[i].begin < c; i++); |
2033 |
while (--i > 0) |
2034 |
remove_mapping(s, index + 1);
|
2035 |
} |
2036 |
assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
2037 |
|| mapping[1].begin >= c);
|
2038 |
mapping->end = c; |
2039 |
|
2040 |
if (!fat_eof(s, c1)) {
|
2041 |
int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); |
2042 |
mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
2043 |
array_get(&(s->mapping), i); |
2044 |
|
2045 |
if (next_mapping == NULL || next_mapping->begin > c1) { |
2046 |
int i1 = array_index(&(s->mapping), mapping);
|
2047 |
|
2048 |
next_mapping = insert_mapping(s, c1, c1+1);
|
2049 |
|
2050 |
if (c1 < c)
|
2051 |
i1++; |
2052 |
mapping = array_get(&(s->mapping), i1); |
2053 |
} |
2054 |
|
2055 |
next_mapping->dir_index = mapping->dir_index; |
2056 |
next_mapping->first_mapping_index = |
2057 |
mapping->first_mapping_index < 0 ?
|
2058 |
array_index(&(s->mapping), mapping) : |
2059 |
mapping->first_mapping_index; |
2060 |
next_mapping->path = mapping->path; |
2061 |
next_mapping->mode = mapping->mode; |
2062 |
next_mapping->read_only = mapping->read_only; |
2063 |
if (mapping->mode & MODE_DIRECTORY) {
|
2064 |
next_mapping->info.dir.parent_mapping_index = |
2065 |
mapping->info.dir.parent_mapping_index; |
2066 |
next_mapping->info.dir.first_dir_index = |
2067 |
mapping->info.dir.first_dir_index + |
2068 |
0x10 * s->sectors_per_cluster *
|
2069 |
(mapping->end - mapping->begin); |
2070 |
} else
|
2071 |
next_mapping->info.file.offset = mapping->info.file.offset + |
2072 |
mapping->end - mapping->begin; |
2073 |
|
2074 |
mapping = next_mapping; |
2075 |
} |
2076 |
|
2077 |
cluster = c1; |
2078 |
} |
2079 |
|
2080 |
return 0; |
2081 |
} |
2082 |
|
2083 |
static int commit_direntries(BDRVVVFATState* s, |
2084 |
int dir_index, int parent_mapping_index) |
2085 |
{ |
2086 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2087 |
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
2088 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2089 |
|
2090 |
int factor = 0x10 * s->sectors_per_cluster; |
2091 |
int old_cluster_count, new_cluster_count;
|
2092 |
int current_dir_index = mapping->info.dir.first_dir_index;
|
2093 |
int first_dir_index = current_dir_index;
|
2094 |
int ret, i;
|
2095 |
uint32_t c; |
2096 |
|
2097 |
DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
2098 |
|
2099 |
assert(direntry); |
2100 |
assert(mapping); |
2101 |
assert(mapping->begin == first_cluster); |
2102 |
assert(mapping->info.dir.first_dir_index < s->directory.next); |
2103 |
assert(mapping->mode & MODE_DIRECTORY); |
2104 |
assert(dir_index == 0 || is_directory(direntry));
|
2105 |
|
2106 |
mapping->info.dir.parent_mapping_index = parent_mapping_index; |
2107 |
|
2108 |
if (first_cluster == 0) { |
2109 |
old_cluster_count = new_cluster_count = |
2110 |
s->last_cluster_of_root_directory; |
2111 |
} else {
|
2112 |
for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2113 |
c = fat_get(s, c)) |
2114 |
old_cluster_count++; |
2115 |
|
2116 |
for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2117 |
c = modified_fat_get(s, c)) |
2118 |
new_cluster_count++; |
2119 |
} |
2120 |
|
2121 |
if (new_cluster_count > old_cluster_count) {
|
2122 |
if (insert_direntries(s,
|
2123 |
current_dir_index + factor * old_cluster_count, |
2124 |
factor * (new_cluster_count - old_cluster_count)) == NULL)
|
2125 |
return -1; |
2126 |
} else if (new_cluster_count < old_cluster_count) |
2127 |
remove_direntries(s, |
2128 |
current_dir_index + factor * new_cluster_count, |
2129 |
factor * (old_cluster_count - new_cluster_count)); |
2130 |
|
2131 |
for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
2132 |
void* direntry = array_get(&(s->directory), current_dir_index);
|
2133 |
int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
2134 |
s->sectors_per_cluster); |
2135 |
if (ret)
|
2136 |
return ret;
|
2137 |
assert(!strncmp(s->directory.pointer, "QEMU", 4)); |
2138 |
current_dir_index += factor; |
2139 |
} |
2140 |
|
2141 |
ret = commit_mappings(s, first_cluster, dir_index); |
2142 |
if (ret)
|
2143 |
return ret;
|
2144 |
|
2145 |
/* recurse */
|
2146 |
for (i = 0; i < factor * new_cluster_count; i++) { |
2147 |
direntry = array_get(&(s->directory), first_dir_index + i); |
2148 |
if (is_directory(direntry) && !is_dot(direntry)) {
|
2149 |
mapping = find_mapping_for_cluster(s, first_cluster); |
2150 |
assert(mapping->mode & MODE_DIRECTORY); |
2151 |
ret = commit_direntries(s, first_dir_index + i, |
2152 |
array_index(&(s->mapping), mapping)); |
2153 |
if (ret)
|
2154 |
return ret;
|
2155 |
} |
2156 |
} |
2157 |
|
2158 |
return 0; |
2159 |
} |
2160 |
|
2161 |
/* commit one file (adjust contents, adjust mapping),
|
2162 |
return first_mapping_index */
|
2163 |
static int commit_one_file(BDRVVVFATState* s, |
2164 |
int dir_index, uint32_t offset)
|
2165 |
{ |
2166 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2167 |
uint32_t c = begin_of_direntry(direntry); |
2168 |
uint32_t first_cluster = c; |
2169 |
mapping_t* mapping = find_mapping_for_cluster(s, c); |
2170 |
uint32_t size = filesize_of_direntry(direntry); |
2171 |
char* cluster = malloc(s->cluster_size);
|
2172 |
uint32_t i; |
2173 |
int fd = 0; |
2174 |
|
2175 |
assert(offset < size); |
2176 |
assert((offset % s->cluster_size) == 0);
|
2177 |
|
2178 |
for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
2179 |
c = modified_fat_get(s, c); |
2180 |
|
2181 |
fd = open(mapping->path, O_RDWR | O_CREAT, 0666);
|
2182 |
if (fd < 0) { |
2183 |
fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
2184 |
strerror(errno), errno); |
2185 |
return fd;
|
2186 |
} |
2187 |
if (offset > 0) |
2188 |
if (lseek(fd, offset, SEEK_SET) != offset)
|
2189 |
return -3; |
2190 |
|
2191 |
while (offset < size) {
|
2192 |
uint32_t c1; |
2193 |
int rest_size = (size - offset > s->cluster_size ?
|
2194 |
s->cluster_size : size - offset); |
2195 |
int ret;
|
2196 |
|
2197 |
c1 = modified_fat_get(s, c); |
2198 |
|
2199 |
assert((size - offset == 0 && fat_eof(s, c)) ||
|
2200 |
(size > offset && c >=2 && !fat_eof(s, c)));
|
2201 |
assert(size >= 0);
|
2202 |
|
2203 |
ret = vvfat_read(s->bs, cluster2sector(s, c), |
2204 |
cluster, (rest_size + 0x1ff) / 0x200); |
2205 |
|
2206 |
if (ret < 0) |
2207 |
return ret;
|
2208 |
|
2209 |
if (write(fd, cluster, rest_size) < 0) |
2210 |
return -2; |
2211 |
|
2212 |
offset += rest_size; |
2213 |
c = c1; |
2214 |
} |
2215 |
|
2216 |
ftruncate(fd, size); |
2217 |
close(fd); |
2218 |
|
2219 |
return commit_mappings(s, first_cluster, dir_index);
|
2220 |
} |
2221 |
|
2222 |
#ifdef DEBUG
|
2223 |
/* test, if all mappings point to valid direntries */
|
2224 |
static void check1(BDRVVVFATState* s) |
2225 |
{ |
2226 |
int i;
|
2227 |
for (i = 0; i < s->mapping.next; i++) { |
2228 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2229 |
if (mapping->mode & MODE_DELETED) {
|
2230 |
fprintf(stderr, "deleted\n");
|
2231 |
continue;
|
2232 |
} |
2233 |
assert(mapping->dir_index >= 0);
|
2234 |
assert(mapping->dir_index < s->directory.next); |
2235 |
direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
2236 |
assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
2237 |
if (mapping->mode & MODE_DIRECTORY) {
|
2238 |
assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
2239 |
assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); |
2240 |
} |
2241 |
} |
2242 |
} |
2243 |
|
2244 |
/* test, if all direntries have mappings */
|
2245 |
static void check2(BDRVVVFATState* s) |
2246 |
{ |
2247 |
int i;
|
2248 |
int first_mapping = -1; |
2249 |
|
2250 |
for (i = 0; i < s->directory.next; i++) { |
2251 |
direntry_t* direntry = array_get(&(s->directory), i); |
2252 |
|
2253 |
if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
2254 |
mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
2255 |
assert(mapping); |
2256 |
assert(mapping->dir_index == i || is_dot(direntry)); |
2257 |
assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); |
2258 |
} |
2259 |
|
2260 |
if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
2261 |
/* cluster start */
|
2262 |
int j, count = 0; |
2263 |
|
2264 |
for (j = 0; j < s->mapping.next; j++) { |
2265 |
mapping_t* mapping = array_get(&(s->mapping), j); |
2266 |
if (mapping->mode & MODE_DELETED)
|
2267 |
continue;
|
2268 |
if (mapping->mode & MODE_DIRECTORY) {
|
2269 |
if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { |
2270 |
assert(++count == 1);
|
2271 |
if (mapping->first_mapping_index == -1) |
2272 |
first_mapping = array_index(&(s->mapping), mapping); |
2273 |
else
|
2274 |
assert(first_mapping == mapping->first_mapping_index); |
2275 |
if (mapping->info.dir.parent_mapping_index < 0) |
2276 |
assert(j == 0);
|
2277 |
else {
|
2278 |
mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
2279 |
assert(parent->mode & MODE_DIRECTORY); |
2280 |
assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); |
2281 |
} |
2282 |
} |
2283 |
} |
2284 |
} |
2285 |
if (count == 0) |
2286 |
first_mapping = -1;
|
2287 |
} |
2288 |
} |
2289 |
} |
2290 |
#endif
|
2291 |
|
2292 |
static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
2293 |
{ |
2294 |
int i;
|
2295 |
|
2296 |
#ifdef DEBUG
|
2297 |
fprintf(stderr, "handle_renames\n");
|
2298 |
for (i = 0; i < s->commits.next; i++) { |
2299 |
commit_t* commit = array_get(&(s->commits), i); |
2300 |
fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
2301 |
} |
2302 |
#endif
|
2303 |
|
2304 |
for (i = 0; i < s->commits.next;) { |
2305 |
commit_t* commit = array_get(&(s->commits), i); |
2306 |
if (commit->action == ACTION_RENAME) {
|
2307 |
mapping_t* mapping = find_mapping_for_cluster(s, |
2308 |
commit->param.rename.cluster); |
2309 |
char* old_path = mapping->path;
|
2310 |
|
2311 |
assert(commit->path); |
2312 |
mapping->path = commit->path; |
2313 |
if (rename(old_path, mapping->path))
|
2314 |
return -2; |
2315 |
|
2316 |
if (mapping->mode & MODE_DIRECTORY) {
|
2317 |
int l1 = strlen(mapping->path);
|
2318 |
int l2 = strlen(old_path);
|
2319 |
int diff = l1 - l2;
|
2320 |
direntry_t* direntry = array_get(&(s->directory), |
2321 |
mapping->info.dir.first_dir_index); |
2322 |
uint32_t c = mapping->begin; |
2323 |
int i = 0; |
2324 |
|
2325 |
/* recurse */
|
2326 |
while (!fat_eof(s, c)) {
|
2327 |
do {
|
2328 |
direntry_t* d = direntry + i; |
2329 |
|
2330 |
if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
2331 |
mapping_t* m = find_mapping_for_cluster(s, |
2332 |
begin_of_direntry(d)); |
2333 |
int l = strlen(m->path);
|
2334 |
char* new_path = malloc(l + diff + 1); |
2335 |
|
2336 |
assert(!strncmp(m->path, mapping->path, l2)); |
2337 |
|
2338 |
strcpy(new_path, mapping->path); |
2339 |
strcpy(new_path + l1, m->path + l2); |
2340 |
|
2341 |
schedule_rename(s, m->begin, new_path); |
2342 |
} |
2343 |
i++; |
2344 |
} while((i % (0x10 * s->sectors_per_cluster)) != 0); |
2345 |
c = fat_get(s, c); |
2346 |
} |
2347 |
} |
2348 |
|
2349 |
free(old_path); |
2350 |
array_remove(&(s->commits), i); |
2351 |
continue;
|
2352 |
} else if (commit->action == ACTION_MKDIR) { |
2353 |
mapping_t* mapping; |
2354 |
int j, parent_path_len;
|
2355 |
|
2356 |
#ifdef __MINGW32__
|
2357 |
if (mkdir(commit->path))
|
2358 |
return -5; |
2359 |
#else
|
2360 |
if (mkdir(commit->path, 0755)) |
2361 |
return -5; |
2362 |
#endif
|
2363 |
|
2364 |
mapping = insert_mapping(s, commit->param.mkdir.cluster, |
2365 |
commit->param.mkdir.cluster + 1);
|
2366 |
if (mapping == NULL) |
2367 |
return -6; |
2368 |
|
2369 |
mapping->mode = MODE_DIRECTORY; |
2370 |
mapping->read_only = 0;
|
2371 |
mapping->path = commit->path; |
2372 |
j = s->directory.next; |
2373 |
assert(j); |
2374 |
insert_direntries(s, s->directory.next, |
2375 |
0x10 * s->sectors_per_cluster);
|
2376 |
mapping->info.dir.first_dir_index = j; |
2377 |
|
2378 |
parent_path_len = strlen(commit->path) |
2379 |
- strlen(get_basename(commit->path)) - 1;
|
2380 |
for (j = 0; j < s->mapping.next; j++) { |
2381 |
mapping_t* m = array_get(&(s->mapping), j); |
2382 |
if (m->first_mapping_index < 0 && m != mapping && |
2383 |
!strncmp(m->path, mapping->path, parent_path_len) && |
2384 |
strlen(m->path) == parent_path_len) |
2385 |
break;
|
2386 |
} |
2387 |
assert(j < s->mapping.next); |
2388 |
mapping->info.dir.parent_mapping_index = j; |
2389 |
|
2390 |
array_remove(&(s->commits), i); |
2391 |
continue;
|
2392 |
} |
2393 |
|
2394 |
i++; |
2395 |
} |
2396 |
return 0; |
2397 |
} |
2398 |
|
2399 |
/*
|
2400 |
* TODO: make sure that the short name is not matching *another* file
|
2401 |
*/
|
2402 |
static int handle_commits(BDRVVVFATState* s) |
2403 |
{ |
2404 |
int i, fail = 0; |
2405 |
|
2406 |
vvfat_close_current_file(s); |
2407 |
|
2408 |
for (i = 0; !fail && i < s->commits.next; i++) { |
2409 |
commit_t* commit = array_get(&(s->commits), i); |
2410 |
switch(commit->action) {
|
2411 |
case ACTION_RENAME: case ACTION_MKDIR: |
2412 |
assert(0);
|
2413 |
fail = -2;
|
2414 |
break;
|
2415 |
case ACTION_WRITEOUT: {
|
2416 |
direntry_t* entry = array_get(&(s->directory), |
2417 |
commit->param.writeout.dir_index); |
2418 |
uint32_t begin = begin_of_direntry(entry); |
2419 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2420 |
|
2421 |
assert(mapping); |
2422 |
assert(mapping->begin == begin); |
2423 |
assert(commit->path == NULL);
|
2424 |
|
2425 |
if (commit_one_file(s, commit->param.writeout.dir_index,
|
2426 |
commit->param.writeout.modified_offset)) |
2427 |
fail = -3;
|
2428 |
|
2429 |
break;
|
2430 |
} |
2431 |
case ACTION_NEW_FILE: {
|
2432 |
int begin = commit->param.new_file.first_cluster;
|
2433 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2434 |
direntry_t* entry; |
2435 |
int i;
|
2436 |
|
2437 |
/* find direntry */
|
2438 |
for (i = 0; i < s->directory.next; i++) { |
2439 |
entry = array_get(&(s->directory), i); |
2440 |
if (is_file(entry) && begin_of_direntry(entry) == begin)
|
2441 |
break;
|
2442 |
} |
2443 |
|
2444 |
if (i >= s->directory.next) {
|
2445 |
fail = -6;
|
2446 |
continue;
|
2447 |
} |
2448 |
|
2449 |
/* make sure there exists an initial mapping */
|
2450 |
if (mapping && mapping->begin != begin) {
|
2451 |
mapping->end = begin; |
2452 |
mapping = NULL;
|
2453 |
} |
2454 |
if (mapping == NULL) { |
2455 |
mapping = insert_mapping(s, begin, begin+1);
|
2456 |
} |
2457 |
/* most members will be fixed in commit_mappings() */
|
2458 |
assert(commit->path); |
2459 |
mapping->path = commit->path; |
2460 |
mapping->read_only = 0;
|
2461 |
mapping->mode = MODE_NORMAL; |
2462 |
mapping->info.file.offset = 0;
|
2463 |
|
2464 |
if (commit_one_file(s, i, 0)) |
2465 |
fail = -7;
|
2466 |
|
2467 |
break;
|
2468 |
} |
2469 |
default:
|
2470 |
assert(0);
|
2471 |
} |
2472 |
} |
2473 |
if (i > 0 && array_remove_slice(&(s->commits), 0, i)) |
2474 |
return -1; |
2475 |
return fail;
|
2476 |
} |
2477 |
|
2478 |
static int handle_deletes(BDRVVVFATState* s) |
2479 |
{ |
2480 |
int i, deferred = 1, deleted = 1; |
2481 |
|
2482 |
/* delete files corresponding to mappings marked as deleted */
|
2483 |
/* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
2484 |
while (deferred && deleted) {
|
2485 |
deferred = 0;
|
2486 |
deleted = 0;
|
2487 |
|
2488 |
for (i = 1; i < s->mapping.next; i++) { |
2489 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2490 |
if (mapping->mode & MODE_DELETED) {
|
2491 |
direntry_t* entry = array_get(&(s->directory), |
2492 |
mapping->dir_index); |
2493 |
|
2494 |
if (is_free(entry)) {
|
2495 |
/* remove file/directory */
|
2496 |
if (mapping->mode & MODE_DIRECTORY) {
|
2497 |
int j, next_dir_index = s->directory.next,
|
2498 |
first_dir_index = mapping->info.dir.first_dir_index; |
2499 |
|
2500 |
if (rmdir(mapping->path) < 0) { |
2501 |
if (errno == ENOTEMPTY) {
|
2502 |
deferred++; |
2503 |
continue;
|
2504 |
} else
|
2505 |
return -5; |
2506 |
} |
2507 |
|
2508 |
for (j = 1; j < s->mapping.next; j++) { |
2509 |
mapping_t* m = array_get(&(s->mapping), j); |
2510 |
if (m->mode & MODE_DIRECTORY &&
|
2511 |
m->info.dir.first_dir_index > |
2512 |
first_dir_index && |
2513 |
m->info.dir.first_dir_index < |
2514 |
next_dir_index) |
2515 |
next_dir_index = |
2516 |
m->info.dir.first_dir_index; |
2517 |
} |
2518 |
remove_direntries(s, first_dir_index, |
2519 |
next_dir_index - first_dir_index); |
2520 |
|
2521 |
deleted++; |
2522 |
} |
2523 |
} else {
|
2524 |
if (unlink(mapping->path))
|
2525 |
return -4; |
2526 |
deleted++; |
2527 |
} |
2528 |
DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
2529 |
remove_mapping(s, i); |
2530 |
} |
2531 |
} |
2532 |
} |
2533 |
|
2534 |
return 0; |
2535 |
} |
2536 |
|
2537 |
/*
|
2538 |
* synchronize mapping with new state:
|
2539 |
*
|
2540 |
* - copy FAT (with bdrv_read)
|
2541 |
* - mark all filenames corresponding to mappings as deleted
|
2542 |
* - recurse direntries from root (using bs->bdrv_read)
|
2543 |
* - delete files corresponding to mappings marked as deleted
|
2544 |
*/
|
2545 |
static int do_commit(BDRVVVFATState* s) |
2546 |
{ |
2547 |
int ret = 0; |
2548 |
|
2549 |
/* the real meat are the commits. Nothing to do? Move along! */
|
2550 |
if (s->commits.next == 0) |
2551 |
return 0; |
2552 |
|
2553 |
vvfat_close_current_file(s); |
2554 |
|
2555 |
ret = handle_renames_and_mkdirs(s); |
2556 |
if (ret) {
|
2557 |
fprintf(stderr, "Error handling renames (%d)\n", ret);
|
2558 |
assert(0);
|
2559 |
return ret;
|
2560 |
} |
2561 |
|
2562 |
/* copy FAT (with bdrv_read) */
|
2563 |
memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
2564 |
|
2565 |
/* recurse direntries from root (using bs->bdrv_read) */
|
2566 |
ret = commit_direntries(s, 0, -1); |
2567 |
if (ret) {
|
2568 |
fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
2569 |
assert(0);
|
2570 |
return ret;
|
2571 |
} |
2572 |
|
2573 |
ret = handle_commits(s); |
2574 |
if (ret) {
|
2575 |
fprintf(stderr, "Error handling commits (%d)\n", ret);
|
2576 |
assert(0);
|
2577 |
return ret;
|
2578 |
} |
2579 |
|
2580 |
ret = handle_deletes(s); |
2581 |
if (ret) {
|
2582 |
fprintf(stderr, "Error deleting\n");
|
2583 |
assert(0);
|
2584 |
return ret;
|
2585 |
} |
2586 |
|
2587 |
s->qcow->drv->bdrv_make_empty(s->qcow); |
2588 |
|
2589 |
memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
2590 |
|
2591 |
DLOG(checkpoint()); |
2592 |
return 0; |
2593 |
} |
2594 |
|
2595 |
static int try_commit(BDRVVVFATState* s) |
2596 |
{ |
2597 |
vvfat_close_current_file(s); |
2598 |
DLOG(checkpoint()); |
2599 |
if(!is_consistent(s))
|
2600 |
return -1; |
2601 |
return do_commit(s);
|
2602 |
} |
2603 |
|
2604 |
static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
2605 |
const uint8_t *buf, int nb_sectors) |
2606 |
{ |
2607 |
BDRVVVFATState *s = bs->opaque; |
2608 |
int i, ret;
|
2609 |
|
2610 |
DLOG(checkpoint()); |
2611 |
|
2612 |
vvfat_close_current_file(s); |
2613 |
|
2614 |
/*
|
2615 |
* Some sanity checks:
|
2616 |
* - do not allow writing to the boot sector
|
2617 |
* - do not allow to write non-ASCII filenames
|
2618 |
*/
|
2619 |
|
2620 |
if (sector_num < s->first_sectors_number)
|
2621 |
return -1; |
2622 |
|
2623 |
for (i = sector2cluster(s, sector_num);
|
2624 |
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
2625 |
mapping_t* mapping = find_mapping_for_cluster(s, i); |
2626 |
if (mapping) {
|
2627 |
if (mapping->read_only) {
|
2628 |
fprintf(stderr, "Tried to write to write-protected file %s\n",
|
2629 |
mapping->path); |
2630 |
return -1; |
2631 |
} |
2632 |
|
2633 |
if (mapping->mode & MODE_DIRECTORY) {
|
2634 |
int begin = cluster2sector(s, i);
|
2635 |
int end = begin + s->sectors_per_cluster, k;
|
2636 |
int dir_index;
|
2637 |
const direntry_t* direntries;
|
2638 |
long_file_name lfn; |
2639 |
|
2640 |
lfn_init(&lfn); |
2641 |
|
2642 |
if (begin < sector_num)
|
2643 |
begin = sector_num; |
2644 |
if (end > sector_num + nb_sectors)
|
2645 |
end = sector_num + nb_sectors; |
2646 |
dir_index = mapping->dir_index + |
2647 |
0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
2648 |
direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
2649 |
|
2650 |
for (k = 0; k < (end - begin) * 0x10; k++) { |
2651 |
/* do not allow non-ASCII filenames */
|
2652 |
if (parse_long_name(&lfn, direntries + k) < 0) { |
2653 |
fprintf(stderr, "Warning: non-ASCII filename\n");
|
2654 |
return -1; |
2655 |
} |
2656 |
/* no access to the direntry of a read-only file */
|
2657 |
else if (is_short_name(direntries+k) && |
2658 |
(direntries[k].attributes & 1)) {
|
2659 |
if (memcmp(direntries + k,
|
2660 |
array_get(&(s->directory), dir_index + k), |
2661 |
sizeof(direntry_t))) {
|
2662 |
fprintf(stderr, "Warning: tried to write to write-protected file\n");
|
2663 |
return -1; |
2664 |
} |
2665 |
} |
2666 |
} |
2667 |
} |
2668 |
i = mapping->end; |
2669 |
} else
|
2670 |
i++; |
2671 |
} |
2672 |
|
2673 |
/*
|
2674 |
* Use qcow backend. Commit later.
|
2675 |
*/
|
2676 |
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); |
2677 |
ret = s->qcow->drv->bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
2678 |
if (ret < 0) { |
2679 |
fprintf(stderr, "Error writing to qcow backend\n");
|
2680 |
return ret;
|
2681 |
} |
2682 |
|
2683 |
for (i = sector2cluster(s, sector_num);
|
2684 |
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
2685 |
if (i >= 0) |
2686 |
s->used_clusters[i] |= USED_ALLOCATED; |
2687 |
|
2688 |
DLOG(checkpoint()); |
2689 |
/* TODO: add timeout */
|
2690 |
try_commit(s); |
2691 |
|
2692 |
DLOG(checkpoint()); |
2693 |
return 0; |
2694 |
} |
2695 |
|
2696 |
static int vvfat_is_allocated(BlockDriverState *bs, |
2697 |
int64_t sector_num, int nb_sectors, int* n) |
2698 |
{ |
2699 |
BDRVVVFATState* s = bs->opaque; |
2700 |
*n = s->sector_count - sector_num; |
2701 |
if (*n > nb_sectors)
|
2702 |
*n = nb_sectors; |
2703 |
else if (*n < 0) |
2704 |
return 0; |
2705 |
return 1; |
2706 |
} |
2707 |
|
2708 |
static int write_target_commit(BlockDriverState *bs, int64_t sector_num, |
2709 |
const uint8_t* buffer, int nb_sectors) { |
2710 |
BDRVVVFATState* s = bs->opaque; |
2711 |
return try_commit(s);
|
2712 |
} |
2713 |
|
2714 |
static void write_target_close(BlockDriverState *bs) { |
2715 |
BDRVVVFATState* s = bs->opaque; |
2716 |
bdrv_delete(s->qcow); |
2717 |
free(s->qcow_filename); |
2718 |
} |
2719 |
|
2720 |
static BlockDriver vvfat_write_target = {
|
2721 |
"vvfat_write_target", 0, NULL, NULL, NULL, |
2722 |
write_target_commit, |
2723 |
write_target_close, |
2724 |
NULL, NULL, NULL |
2725 |
}; |
2726 |
|
2727 |
static int enable_write_target(BDRVVVFATState *s) |
2728 |
{ |
2729 |
int size = sector2cluster(s, s->sector_count);
|
2730 |
s->used_clusters = calloc(size, 1);
|
2731 |
|
2732 |
array_init(&(s->commits), sizeof(commit_t));
|
2733 |
|
2734 |
s->qcow_filename = malloc(1024);
|
2735 |
strcpy(s->qcow_filename, "/tmp/vl.XXXXXX");
|
2736 |
get_tmp_filename(s->qcow_filename, strlen(s->qcow_filename) + 1);
|
2737 |
if (bdrv_create(&bdrv_qcow,
|
2738 |
s->qcow_filename, s->sector_count, "fat:", 0) < 0) |
2739 |
return -1; |
2740 |
s->qcow = bdrv_new("");
|
2741 |
if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0) |
2742 |
return -1; |
2743 |
|
2744 |
#ifndef _WIN32
|
2745 |
unlink(s->qcow_filename); |
2746 |
#endif
|
2747 |
|
2748 |
s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1); |
2749 |
s->bs->backing_hd->drv = &vvfat_write_target; |
2750 |
s->bs->backing_hd->opaque = s; |
2751 |
|
2752 |
return 0; |
2753 |
} |
2754 |
|
2755 |
static void vvfat_close(BlockDriverState *bs) |
2756 |
{ |
2757 |
BDRVVVFATState *s = bs->opaque; |
2758 |
|
2759 |
vvfat_close_current_file(s); |
2760 |
array_free(&(s->fat)); |
2761 |
array_free(&(s->directory)); |
2762 |
array_free(&(s->mapping)); |
2763 |
if(s->cluster_buffer)
|
2764 |
free(s->cluster_buffer); |
2765 |
} |
2766 |
|
2767 |
BlockDriver bdrv_vvfat = { |
2768 |
"vvfat",
|
2769 |
sizeof(BDRVVVFATState),
|
2770 |
vvfat_probe, |
2771 |
vvfat_open, |
2772 |
vvfat_read, |
2773 |
vvfat_write, |
2774 |
vvfat_close, |
2775 |
NULL,
|
2776 |
vvfat_is_allocated |
2777 |
}; |
2778 |
|
2779 |
#ifdef DEBUG
|
2780 |
static void checkpoint() { |
2781 |
assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
2782 |
check1(vvv); |
2783 |
check2(vvv); |
2784 |
assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); |
2785 |
#if 0
|
2786 |
if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
|
2787 |
fprintf(stderr, "Nonono!\n");
|
2788 |
mapping_t* mapping;
|
2789 |
direntry_t* direntry;
|
2790 |
assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
|
2791 |
assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
|
2792 |
if (vvv->mapping.next<47)
|
2793 |
return;
|
2794 |
assert((mapping = array_get(&(vvv->mapping), 47)));
|
2795 |
assert(mapping->dir_index < vvv->directory.next);
|
2796 |
direntry = array_get(&(vvv->directory), mapping->dir_index);
|
2797 |
assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
|
2798 |
#endif
|
2799 |
return;
|
2800 |
/* avoid compiler warnings: */
|
2801 |
hexdump(NULL, 100); |
2802 |
remove_mapping(vvv, NULL);
|
2803 |
print_mapping(NULL);
|
2804 |
print_direntry(NULL);
|
2805 |
} |
2806 |
#endif
|
2807 |
|