git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4815 c046a42c-6fe2-441c-8c8c-71466251a162
2843 lines
79 KiB
C
2843 lines
79 KiB
C
/* 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 "qemu-common.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(void);
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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) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0)
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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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static 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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static 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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static 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 {
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uint8_t head;
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uint8_t sector;
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uint8_t cylinder;
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} mbr_chs_t;
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typedef struct partition_t {
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uint8_t attributes; /* 0x80 = bootable */
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mbr_chs_t start_CHS;
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uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
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mbr_chs_t end_CHS;
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uint32_t start_sector_long;
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uint32_t length_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[0x1b8];
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uint32_t nt_id;
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uint8_t ignored2[2];
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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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/* 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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/* take the sector position spos and convert it to Cylinder/Head/Sector position
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* if the position is outside the specified geometry, fill maximum value for CHS
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* and return 1 to signal overflow.
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*/
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static int sector2CHS(BlockDriverState* bs, mbr_chs_t * chs, int spos){
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int head,sector;
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sector = spos % (bs->secs); spos/= bs->secs;
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head = spos % (bs->heads); spos/= bs->heads;
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if(spos >= bs->cyls){
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/* Overflow,
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it happens if 32bit sector positions are used, while CHS is only 24bit.
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Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */
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chs->head = 0xFF;
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chs->sector = 0xFF;
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chs->cylinder = 0xFF;
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return 1;
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}
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chs->head = (uint8_t)head;
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chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
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chs->cylinder = (uint8_t)spos;
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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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int lba;
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memset(s->first_sectors,0,512);
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/* Win NT Disk Signature */
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real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
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partition->attributes=0x80; /* bootable */
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/* LBA is used when partition is outside the CHS geometry */
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lba = sector2CHS(s->bs, &partition->start_CHS, s->first_sectors_number-1);
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lba|= sector2CHS(s->bs, &partition->end_CHS, s->sector_count);
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/*LBA partitions are identified only by start/length_sector_long not by CHS*/
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partition->start_sector_long =cpu_to_le32(s->first_sectors_number-1);
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partition->length_sector_long=cpu_to_le32(s->sector_count - s->first_sectors_number+1);
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/* FAT12/FAT16/FAT32 */
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/* DOS uses different types when partition is LBA,
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probably to prevent older versions from using CHS on them */
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partition->fs_type= s->fat_type==12 ? 0x1:
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s->fat_type==16 ? (lba?0xe:0x06):
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/*fat_tyoe==32*/ (lba?0xc:0x0b);
|
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|
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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 */
|
||
|
||
/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
|
||
static inline int short2long_name(char* dest,const char* src)
|
||
{
|
||
int i;
|
||
int len;
|
||
for(i=0;i<129 && src[i];i++) {
|
||
dest[2*i]=src[i];
|
||
dest[2*i+1]=0;
|
||
}
|
||
len=2*i;
|
||
dest[2*i]=dest[2*i+1]=0;
|
||
for(i=2*i+2;(i%26);i++)
|
||
dest[i]=0xff;
|
||
return len;
|
||
}
|
||
|
||
static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename)
|
||
{
|
||
char buffer[258];
|
||
int length=short2long_name(buffer,filename),
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||
number_of_entries=(length+25)/26,i;
|
||
direntry_t* entry;
|
||
|
||
for(i=0;i<number_of_entries;i++) {
|
||
entry=array_get_next(&(s->directory));
|
||
entry->attributes=0xf;
|
||
entry->reserved[0]=0;
|
||
entry->begin=0;
|
||
entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
|
||
}
|
||
for(i=0;i<26*number_of_entries;i++) {
|
||
int offset=(i%26);
|
||
if(offset<10) offset=1+offset;
|
||
else if(offset<22) offset=14+offset-10;
|
||
else offset=28+offset-22;
|
||
entry=array_get(&(s->directory),s->directory.next-1-(i/26));
|
||
entry->name[offset]=buffer[i];
|
||
}
|
||
return array_get(&(s->directory),s->directory.next-number_of_entries);
|
||
}
|
||
|
||
static char is_free(const direntry_t* direntry)
|
||
{
|
||
return direntry->name[0]==0xe5 || direntry->name[0]==0x00;
|
||
}
|
||
|
||
static char is_volume_label(const direntry_t* direntry)
|
||
{
|
||
return direntry->attributes == 0x28;
|
||
}
|
||
|
||
static char is_long_name(const direntry_t* direntry)
|
||
{
|
||
return direntry->attributes == 0xf;
|
||
}
|
||
|
||
static char is_short_name(const direntry_t* direntry)
|
||
{
|
||
return !is_volume_label(direntry) && !is_long_name(direntry)
|
||
&& !is_free(direntry);
|
||
}
|
||
|
||
static char is_directory(const direntry_t* direntry)
|
||
{
|
||
return direntry->attributes & 0x10 && direntry->name[0] != 0xe5;
|
||
}
|
||
|
||
static inline char is_dot(const direntry_t* direntry)
|
||
{
|
||
return is_short_name(direntry) && direntry->name[0] == '.';
|
||
}
|
||
|
||
static char is_file(const direntry_t* direntry)
|
||
{
|
||
return is_short_name(direntry) && !is_directory(direntry);
|
||
}
|
||
|
||
static inline uint32_t begin_of_direntry(const direntry_t* direntry)
|
||
{
|
||
return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
|
||
}
|
||
|
||
static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
|
||
{
|
||
return le32_to_cpu(direntry->size);
|
||
}
|
||
|
||
static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
|
||
{
|
||
direntry->begin = cpu_to_le16(begin & 0xffff);
|
||
direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
|
||
}
|
||
|
||
/* fat functions */
|
||
|
||
static inline uint8_t fat_chksum(const direntry_t* entry)
|
||
{
|
||
uint8_t chksum=0;
|
||
int i;
|
||
|
||
for(i=0;i<11;i++)
|
||
chksum=(((chksum&0xfe)>>1)|((chksum&0x01)?0x80:0))
|
||
+(unsigned char)entry->name[i];
|
||
|
||
return chksum;
|
||
}
|
||
|
||
/* if return_time==0, this returns the fat_date, else the fat_time */
|
||
static uint16_t fat_datetime(time_t time,int return_time) {
|
||
struct tm* t;
|
||
#ifdef _WIN32
|
||
t=localtime(&time); /* this is not thread safe */
|
||
#else
|
||
struct tm t1;
|
||
t=&t1;
|
||
localtime_r(&time,t);
|
||
#endif
|
||
if(return_time)
|
||
return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
|
||
return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
|
||
}
|
||
|
||
static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
|
||
{
|
||
if(s->fat_type==32) {
|
||
uint32_t* entry=array_get(&(s->fat),cluster);
|
||
*entry=cpu_to_le32(value);
|
||
} else if(s->fat_type==16) {
|
||
uint16_t* entry=array_get(&(s->fat),cluster);
|
||
*entry=cpu_to_le16(value&0xffff);
|
||
} else {
|
||
int offset = (cluster*3/2);
|
||
unsigned char* p = array_get(&(s->fat), offset);
|
||
switch (cluster&1) {
|
||
case 0:
|
||
p[0] = value&0xff;
|
||
p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
|
||
break;
|
||
case 1:
|
||
p[0] = (p[0]&0xf) | ((value&0xf)<<4);
|
||
p[1] = (value>>4);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
|
||
{
|
||
if(s->fat_type==32) {
|
||
uint32_t* entry=array_get(&(s->fat),cluster);
|
||
return le32_to_cpu(*entry);
|
||
} else if(s->fat_type==16) {
|
||
uint16_t* entry=array_get(&(s->fat),cluster);
|
||
return le16_to_cpu(*entry);
|
||
} else {
|
||
const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
|
||
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
|
||
}
|
||
}
|
||
|
||
static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
|
||
{
|
||
if(fat_entry>s->max_fat_value-8)
|
||
return -1;
|
||
return 0;
|
||
}
|
||
|
||
static inline void init_fat(BDRVVVFATState* s)
|
||
{
|
||
if (s->fat_type == 12) {
|
||
array_init(&(s->fat),1);
|
||
array_ensure_allocated(&(s->fat),
|
||
s->sectors_per_fat * 0x200 * 3 / 2 - 1);
|
||
} else {
|
||
array_init(&(s->fat),(s->fat_type==32?4:2));
|
||
array_ensure_allocated(&(s->fat),
|
||
s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
|
||
}
|
||
memset(s->fat.pointer,0,s->fat.size);
|
||
|
||
switch(s->fat_type) {
|
||
case 12: s->max_fat_value=0xfff; break;
|
||
case 16: s->max_fat_value=0xffff; break;
|
||
case 32: s->max_fat_value=0x0fffffff; break;
|
||
default: s->max_fat_value=0; /* error... */
|
||
}
|
||
|
||
}
|
||
|
||
/* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
|
||
/* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
|
||
static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
|
||
unsigned int directory_start, const char* filename, int is_dot)
|
||
{
|
||
int i,j,long_index=s->directory.next;
|
||
direntry_t* entry=0;
|
||
direntry_t* entry_long=0;
|
||
|
||
if(is_dot) {
|
||
entry=array_get_next(&(s->directory));
|
||
memset(entry->name,0x20,11);
|
||
memcpy(entry->name,filename,strlen(filename));
|
||
return entry;
|
||
}
|
||
|
||
entry_long=create_long_filename(s,filename);
|
||
|
||
i = strlen(filename);
|
||
for(j = i - 1; j>0 && filename[j]!='.';j--);
|
||
if (j > 0)
|
||
i = (j > 8 ? 8 : j);
|
||
else if (i > 8)
|
||
i = 8;
|
||
|
||
entry=array_get_next(&(s->directory));
|
||
memset(entry->name,0x20,11);
|
||
strncpy((char*)entry->name,filename,i);
|
||
|
||
if(j > 0)
|
||
for (i = 0; i < 3 && filename[j+1+i]; i++)
|
||
entry->extension[i] = filename[j+1+i];
|
||
|
||
/* upcase & remove unwanted characters */
|
||
for(i=10;i>=0;i--) {
|
||
if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--);
|
||
if(entry->name[i]<=' ' || entry->name[i]>0x7f
|
||
|| strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
|
||
entry->name[i]='_';
|
||
else if(entry->name[i]>='a' && entry->name[i]<='z')
|
||
entry->name[i]+='A'-'a';
|
||
}
|
||
|
||
/* mangle duplicates */
|
||
while(1) {
|
||
direntry_t* entry1=array_get(&(s->directory),directory_start);
|
||
int j;
|
||
|
||
for(;entry1<entry;entry1++)
|
||
if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11))
|
||
break; /* found dupe */
|
||
if(entry1==entry) /* no dupe found */
|
||
break;
|
||
|
||
/* use all 8 characters of name */
|
||
if(entry->name[7]==' ') {
|
||
int j;
|
||
for(j=6;j>0 && entry->name[j]==' ';j--)
|
||
entry->name[j]='~';
|
||
}
|
||
|
||
/* increment number */
|
||
for(j=7;j>0 && entry->name[j]=='9';j--)
|
||
entry->name[j]='0';
|
||
if(j>0) {
|
||
if(entry->name[j]<'0' || entry->name[j]>'9')
|
||
entry->name[j]='0';
|
||
else
|
||
entry->name[j]++;
|
||
}
|
||
}
|
||
|
||
/* calculate checksum; propagate to long name */
|
||
if(entry_long) {
|
||
uint8_t chksum=fat_chksum(entry);
|
||
|
||
/* calculate anew, because realloc could have taken place */
|
||
entry_long=array_get(&(s->directory),long_index);
|
||
while(entry_long<entry && is_long_name(entry_long)) {
|
||
entry_long->reserved[1]=chksum;
|
||
entry_long++;
|
||
}
|
||
}
|
||
|
||
return entry;
|
||
}
|
||
|
||
/*
|
||
* Read a directory. (the index of the corresponding mapping must be passed).
|
||
*/
|
||
static int read_directory(BDRVVVFATState* s, int mapping_index)
|
||
{
|
||
mapping_t* mapping = array_get(&(s->mapping), mapping_index);
|
||
direntry_t* direntry;
|
||
const char* dirname = mapping->path;
|
||
int first_cluster = mapping->begin;
|
||
int parent_index = mapping->info.dir.parent_mapping_index;
|
||
mapping_t* parent_mapping = (mapping_t*)
|
||
(parent_index >= 0 ? array_get(&(s->mapping), parent_index) : 0);
|
||
int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
|
||
|
||
DIR* dir=opendir(dirname);
|
||
struct dirent* entry;
|
||
int i;
|
||
|
||
assert(mapping->mode & MODE_DIRECTORY);
|
||
|
||
if(!dir) {
|
||
mapping->end = mapping->begin;
|
||
return -1;
|
||
}
|
||
|
||
i = mapping->info.dir.first_dir_index =
|
||
first_cluster == 0 ? 0 : s->directory.next;
|
||
|
||
/* actually read the directory, and allocate the mappings */
|
||
while((entry=readdir(dir))) {
|
||
unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
|
||
char* buffer;
|
||
direntry_t* direntry;
|
||
struct stat st;
|
||
int is_dot=!strcmp(entry->d_name,".");
|
||
int is_dotdot=!strcmp(entry->d_name,"..");
|
||
|
||
if(first_cluster == 0 && (is_dotdot || is_dot))
|
||
continue;
|
||
|
||
buffer=(char*)malloc(length);
|
||
assert(buffer);
|
||
snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
||
|
||
if(stat(buffer,&st)<0) {
|
||
free(buffer);
|
||
continue;
|
||
}
|
||
|
||
/* create directory entry for this file */
|
||
direntry=create_short_and_long_name(s, i, entry->d_name,
|
||
is_dot || is_dotdot);
|
||
direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
|
||
direntry->reserved[0]=direntry->reserved[1]=0;
|
||
direntry->ctime=fat_datetime(st.st_ctime,1);
|
||
direntry->cdate=fat_datetime(st.st_ctime,0);
|
||
direntry->adate=fat_datetime(st.st_atime,0);
|
||
direntry->begin_hi=0;
|
||
direntry->mtime=fat_datetime(st.st_mtime,1);
|
||
direntry->mdate=fat_datetime(st.st_mtime,0);
|
||
if(is_dotdot)
|
||
set_begin_of_direntry(direntry, first_cluster_of_parent);
|
||
else if(is_dot)
|
||
set_begin_of_direntry(direntry, first_cluster);
|
||
else
|
||
direntry->begin=0; /* do that later */
|
||
if (st.st_size > 0x7fffffff) {
|
||
fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
||
free(buffer);
|
||
return -2;
|
||
}
|
||
direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
||
|
||
/* create mapping for this file */
|
||
if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
||
s->current_mapping=(mapping_t*)array_get_next(&(s->mapping));
|
||
s->current_mapping->begin=0;
|
||
s->current_mapping->end=st.st_size;
|
||
/*
|
||
* we get the direntry of the most recent direntry, which
|
||
* contains the short name and all the relevant information.
|
||
*/
|
||
s->current_mapping->dir_index=s->directory.next-1;
|
||
s->current_mapping->first_mapping_index = -1;
|
||
if (S_ISDIR(st.st_mode)) {
|
||
s->current_mapping->mode = MODE_DIRECTORY;
|
||
s->current_mapping->info.dir.parent_mapping_index =
|
||
mapping_index;
|
||
} else {
|
||
s->current_mapping->mode = MODE_UNDEFINED;
|
||
s->current_mapping->info.file.offset = 0;
|
||
}
|
||
s->current_mapping->path=buffer;
|
||
s->current_mapping->read_only =
|
||
(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
||
}
|
||
}
|
||
closedir(dir);
|
||
|
||
/* fill with zeroes up to the end of the cluster */
|
||
while(s->directory.next%(0x10*s->sectors_per_cluster)) {
|
||
direntry_t* direntry=array_get_next(&(s->directory));
|
||
memset(direntry,0,sizeof(direntry_t));
|
||
}
|
||
|
||
/* TODO: if there are more entries, bootsector has to be adjusted! */
|
||
#define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster)
|
||
if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) {
|
||
/* root directory */
|
||
int cur = s->directory.next;
|
||
array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
|
||
memset(array_get(&(s->directory), cur), 0,
|
||
(ROOT_ENTRIES - cur) * sizeof(direntry_t));
|
||
}
|
||
|
||
/* reget the mapping, since s->mapping was possibly realloc()ed */
|
||
mapping = (mapping_t*)array_get(&(s->mapping), mapping_index);
|
||
first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
|
||
* 0x20 / s->cluster_size;
|
||
mapping->end = first_cluster;
|
||
|
||
direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index);
|
||
set_begin_of_direntry(direntry, mapping->begin);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
|
||
{
|
||
return (sector_num-s->faked_sectors)/s->sectors_per_cluster;
|
||
}
|
||
|
||
static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
|
||
{
|
||
return s->faked_sectors + s->sectors_per_cluster * cluster_num;
|
||
}
|
||
|
||
static inline uint32_t sector_offset_in_cluster(BDRVVVFATState* s,off_t sector_num)
|
||
{
|
||
return (sector_num-s->first_sectors_number-2*s->sectors_per_fat)%s->sectors_per_cluster;
|
||
}
|
||
|
||
#ifdef DBG
|
||
static direntry_t* get_direntry_for_mapping(BDRVVVFATState* s,mapping_t* mapping)
|
||
{
|
||
if(mapping->mode==MODE_UNDEFINED)
|
||
return 0;
|
||
return (direntry_t*)(s->directory.pointer+sizeof(direntry_t)*mapping->dir_index);
|
||
}
|
||
#endif
|
||
|
||
static int init_directories(BDRVVVFATState* s,
|
||
const char* dirname)
|
||
{
|
||
bootsector_t* bootsector;
|
||
mapping_t* mapping;
|
||
unsigned int i;
|
||
unsigned int cluster;
|
||
|
||
memset(&(s->first_sectors[0]),0,0x40*0x200);
|
||
|
||
s->cluster_size=s->sectors_per_cluster*0x200;
|
||
s->cluster_buffer=malloc(s->cluster_size);
|
||
assert(s->cluster_buffer);
|
||
|
||
/*
|
||
* The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
||
* where sc is sector_count,
|
||
* spf is sectors_per_fat,
|
||
* spc is sectors_per_clusters, and
|
||
* fat_type = 12, 16 or 32.
|
||
*/
|
||
i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
|
||
s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
||
|
||
array_init(&(s->mapping),sizeof(mapping_t));
|
||
array_init(&(s->directory),sizeof(direntry_t));
|
||
|
||
/* add volume label */
|
||
{
|
||
direntry_t* entry=array_get_next(&(s->directory));
|
||
entry->attributes=0x28; /* archive | volume label */
|
||
snprintf((char*)entry->name,11,"QEMU VVFAT");
|
||
}
|
||
|
||
/* Now build FAT, and write back information into directory */
|
||
init_fat(s);
|
||
|
||
s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
|
||
s->cluster_count=sector2cluster(s, s->sector_count);
|
||
|
||
mapping = array_get_next(&(s->mapping));
|
||
mapping->begin = 0;
|
||
mapping->dir_index = 0;
|
||
mapping->info.dir.parent_mapping_index = -1;
|
||
mapping->first_mapping_index = -1;
|
||
mapping->path = strdup(dirname);
|
||
i = strlen(mapping->path);
|
||
if (i > 0 && mapping->path[i - 1] == '/')
|
||
mapping->path[i - 1] = '\0';
|
||
mapping->mode = MODE_DIRECTORY;
|
||
mapping->read_only = 0;
|
||
s->path = mapping->path;
|
||
|
||
for (i = 0, cluster = 0; i < s->mapping.next; i++) {
|
||
int j;
|
||
/* MS-DOS expects the FAT to be 0 for the root directory
|
||
* (except for the media byte). */
|
||
/* LATER TODO: still true for FAT32? */
|
||
int fix_fat = (i != 0);
|
||
mapping = array_get(&(s->mapping), i);
|
||
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
mapping->begin = cluster;
|
||
if(read_directory(s, i)) {
|
||
fprintf(stderr, "Could not read directory %s\n",
|
||
mapping->path);
|
||
return -1;
|
||
}
|
||
mapping = array_get(&(s->mapping), i);
|
||
} else {
|
||
assert(mapping->mode == MODE_UNDEFINED);
|
||
mapping->mode=MODE_NORMAL;
|
||
mapping->begin = cluster;
|
||
if (mapping->end > 0) {
|
||
direntry_t* direntry = array_get(&(s->directory),
|
||
mapping->dir_index);
|
||
|
||
mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
|
||
set_begin_of_direntry(direntry, mapping->begin);
|
||
} else {
|
||
mapping->end = cluster + 1;
|
||
fix_fat = 0;
|
||
}
|
||
}
|
||
|
||
assert(mapping->begin < mapping->end);
|
||
|
||
/* fix fat for entry */
|
||
if (fix_fat) {
|
||
for(j = mapping->begin; j < mapping->end - 1; j++)
|
||
fat_set(s, j, j+1);
|
||
fat_set(s, mapping->end - 1, s->max_fat_value);
|
||
}
|
||
|
||
/* next free cluster */
|
||
cluster = mapping->end;
|
||
|
||
if(cluster > s->cluster_count) {
|
||
fprintf(stderr,"Directory does not fit in FAT%d\n",s->fat_type);
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
mapping = array_get(&(s->mapping), 0);
|
||
s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster;
|
||
s->last_cluster_of_root_directory = mapping->end;
|
||
|
||
/* the FAT signature */
|
||
fat_set(s,0,s->max_fat_value);
|
||
fat_set(s,1,s->max_fat_value);
|
||
|
||
s->current_mapping = NULL;
|
||
|
||
bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200);
|
||
bootsector->jump[0]=0xeb;
|
||
bootsector->jump[1]=0x3e;
|
||
bootsector->jump[2]=0x90;
|
||
memcpy(bootsector->name,"QEMU ",8);
|
||
bootsector->sector_size=cpu_to_le16(0x200);
|
||
bootsector->sectors_per_cluster=s->sectors_per_cluster;
|
||
bootsector->reserved_sectors=cpu_to_le16(1);
|
||
bootsector->number_of_fats=0x2; /* number of FATs */
|
||
bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
|
||
bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
|
||
bootsector->media_type=(s->fat_type!=12?0xf8:s->sector_count==5760?0xf9:0xf8); /* media descriptor */
|
||
s->fat.pointer[0] = bootsector->media_type;
|
||
bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
|
||
bootsector->sectors_per_track=cpu_to_le16(s->bs->secs);
|
||
bootsector->number_of_heads=cpu_to_le16(s->bs->heads);
|
||
bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f);
|
||
bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
|
||
|
||
/* LATER TODO: if FAT32, this is wrong */
|
||
bootsector->u.fat16.drive_number=s->fat_type==12?0:0x80; /* assume this is hda (TODO) */
|
||
bootsector->u.fat16.current_head=0;
|
||
bootsector->u.fat16.signature=0x29;
|
||
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
||
|
||
memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11);
|
||
memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8);
|
||
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
|
||
|
||
return 0;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
static BDRVVVFATState *vvv = NULL;
|
||
#endif
|
||
|
||
static int enable_write_target(BDRVVVFATState *s);
|
||
static int is_consistent(BDRVVVFATState *s);
|
||
|
||
static int vvfat_open(BlockDriverState *bs, const char* dirname, int flags)
|
||
{
|
||
BDRVVVFATState *s = bs->opaque;
|
||
int floppy = 0;
|
||
int i;
|
||
|
||
#ifdef DEBUG
|
||
vvv = s;
|
||
#endif
|
||
|
||
DLOG(if (stderr == NULL) {
|
||
stderr = fopen("vvfat.log", "a");
|
||
setbuf(stderr, NULL);
|
||
})
|
||
|
||
s->bs = bs;
|
||
|
||
s->fat_type=16;
|
||
/* LATER TODO: if FAT32, adjust */
|
||
s->sectors_per_cluster=0x10;
|
||
/* 504MB disk*/
|
||
bs->cyls=1024; bs->heads=16; bs->secs=63;
|
||
|
||
s->current_cluster=0xffffffff;
|
||
|
||
s->first_sectors_number=0x40;
|
||
/* read only is the default for safety */
|
||
bs->read_only = 1;
|
||
s->qcow = s->write_target = NULL;
|
||
s->qcow_filename = NULL;
|
||
s->fat2 = NULL;
|
||
s->downcase_short_names = 1;
|
||
|
||
if (!strstart(dirname, "fat:", NULL))
|
||
return -1;
|
||
|
||
if (strstr(dirname, ":floppy:")) {
|
||
floppy = 1;
|
||
s->fat_type = 12;
|
||
s->first_sectors_number = 1;
|
||
s->sectors_per_cluster=2;
|
||
bs->cyls = 80; bs->heads = 2; bs->secs = 36;
|
||
}
|
||
|
||
s->sector_count=bs->cyls*bs->heads*bs->secs;
|
||
|
||
if (strstr(dirname, ":32:")) {
|
||
fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
|
||
s->fat_type = 32;
|
||
} else if (strstr(dirname, ":16:")) {
|
||
s->fat_type = 16;
|
||
} else if (strstr(dirname, ":12:")) {
|
||
s->fat_type = 12;
|
||
s->sector_count=2880;
|
||
}
|
||
|
||
if (strstr(dirname, ":rw:")) {
|
||
if (enable_write_target(s))
|
||
return -1;
|
||
bs->read_only = 0;
|
||
}
|
||
|
||
i = strrchr(dirname, ':') - dirname;
|
||
assert(i >= 3);
|
||
if (dirname[i-2] == ':' && isalpha(dirname[i-1]))
|
||
/* workaround for DOS drive names */
|
||
dirname += i-1;
|
||
else
|
||
dirname += i+1;
|
||
|
||
bs->total_sectors=bs->cyls*bs->heads*bs->secs;
|
||
|
||
if(init_directories(s, dirname))
|
||
return -1;
|
||
|
||
s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count;
|
||
|
||
if(s->first_sectors_number==0x40)
|
||
init_mbr(s);
|
||
|
||
/* for some reason or other, MS-DOS does not like to know about CHS... */
|
||
if (floppy)
|
||
bs->heads = bs->cyls = bs->secs = 0;
|
||
|
||
// assert(is_consistent(s));
|
||
return 0;
|
||
}
|
||
|
||
static inline void vvfat_close_current_file(BDRVVVFATState *s)
|
||
{
|
||
if(s->current_mapping) {
|
||
s->current_mapping = NULL;
|
||
if (s->current_fd) {
|
||
close(s->current_fd);
|
||
s->current_fd = 0;
|
||
}
|
||
}
|
||
s->current_cluster = -1;
|
||
}
|
||
|
||
/* mappings between index1 and index2-1 are supposed to be ordered
|
||
* return value is the index of the last mapping for which end>cluster_num
|
||
*/
|
||
static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
|
||
{
|
||
int index3=index1+1;
|
||
while(1) {
|
||
mapping_t* mapping;
|
||
index3=(index1+index2)/2;
|
||
mapping=array_get(&(s->mapping),index3);
|
||
assert(mapping->begin < mapping->end);
|
||
if(mapping->begin>=cluster_num) {
|
||
assert(index2!=index3 || index2==0);
|
||
if(index2==index3)
|
||
return index1;
|
||
index2=index3;
|
||
} else {
|
||
if(index1==index3)
|
||
return mapping->end<=cluster_num ? index2 : index1;
|
||
index1=index3;
|
||
}
|
||
assert(index1<=index2);
|
||
DLOG(mapping=array_get(&(s->mapping),index1);
|
||
assert(mapping->begin<=cluster_num);
|
||
assert(index2 >= s->mapping.next ||
|
||
((mapping = array_get(&(s->mapping),index2)) &&
|
||
mapping->end>cluster_num)));
|
||
}
|
||
}
|
||
|
||
static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
|
||
{
|
||
int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
|
||
mapping_t* mapping;
|
||
if(index>=s->mapping.next)
|
||
return 0;
|
||
mapping=array_get(&(s->mapping),index);
|
||
if(mapping->begin>cluster_num)
|
||
return 0;
|
||
assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
|
||
return mapping;
|
||
}
|
||
|
||
/*
|
||
* This function simply compares path == mapping->path. Since the mappings
|
||
* are sorted by cluster, this is expensive: O(n).
|
||
*/
|
||
static inline mapping_t* find_mapping_for_path(BDRVVVFATState* s,
|
||
const char* path)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
if (mapping->first_mapping_index < 0 &&
|
||
!strcmp(path, mapping->path))
|
||
return mapping;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static int open_file(BDRVVVFATState* s,mapping_t* mapping)
|
||
{
|
||
if(!mapping)
|
||
return -1;
|
||
if(!s->current_mapping ||
|
||
strcmp(s->current_mapping->path,mapping->path)) {
|
||
/* open file */
|
||
int fd = open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
||
if(fd<0)
|
||
return -1;
|
||
vvfat_close_current_file(s);
|
||
s->current_fd = fd;
|
||
s->current_mapping = mapping;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
|
||
{
|
||
if(s->current_cluster != cluster_num) {
|
||
int result=0;
|
||
off_t offset;
|
||
assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
|
||
if(!s->current_mapping
|
||
|| s->current_mapping->begin>cluster_num
|
||
|| s->current_mapping->end<=cluster_num) {
|
||
/* binary search of mappings for file */
|
||
mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
|
||
|
||
assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
|
||
|
||
if (mapping && mapping->mode & MODE_DIRECTORY) {
|
||
vvfat_close_current_file(s);
|
||
s->current_mapping = mapping;
|
||
read_cluster_directory:
|
||
offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
|
||
s->cluster = (unsigned char*)s->directory.pointer+offset
|
||
+ 0x20*s->current_mapping->info.dir.first_dir_index;
|
||
assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
|
||
assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
||
s->current_cluster = cluster_num;
|
||
return 0;
|
||
}
|
||
|
||
if(open_file(s,mapping))
|
||
return -2;
|
||
} else if (s->current_mapping->mode & MODE_DIRECTORY)
|
||
goto read_cluster_directory;
|
||
|
||
assert(s->current_fd);
|
||
|
||
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
|
||
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
||
return -3;
|
||
s->cluster=s->cluster_buffer;
|
||
result=read(s->current_fd,s->cluster,s->cluster_size);
|
||
if(result<0) {
|
||
s->current_cluster = -1;
|
||
return -1;
|
||
}
|
||
s->current_cluster = cluster_num;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
static void hexdump(const void* address, uint32_t len)
|
||
{
|
||
const unsigned char* p = address;
|
||
int i, j;
|
||
|
||
for (i = 0; i < len; i += 16) {
|
||
for (j = 0; j < 16 && i + j < len; j++)
|
||
fprintf(stderr, "%02x ", p[i + j]);
|
||
for (; j < 16; j++)
|
||
fprintf(stderr, " ");
|
||
fprintf(stderr, " ");
|
||
for (j = 0; j < 16 && i + j < len; j++)
|
||
fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]);
|
||
fprintf(stderr, "\n");
|
||
}
|
||
}
|
||
|
||
static void print_direntry(const direntry_t* direntry)
|
||
{
|
||
int j = 0;
|
||
char buffer[1024];
|
||
|
||
fprintf(stderr, "direntry 0x%x: ", (int)direntry);
|
||
if(!direntry)
|
||
return;
|
||
if(is_long_name(direntry)) {
|
||
unsigned char* c=(unsigned char*)direntry;
|
||
int i;
|
||
for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
|
||
#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = '<27>'; j++;}
|
||
ADD_CHAR(c[i]);
|
||
for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
|
||
ADD_CHAR(c[i]);
|
||
for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
|
||
ADD_CHAR(c[i]);
|
||
buffer[j] = 0;
|
||
fprintf(stderr, "%s\n", buffer);
|
||
} else {
|
||
int i;
|
||
for(i=0;i<11;i++)
|
||
ADD_CHAR(direntry->name[i]);
|
||
buffer[j] = 0;
|
||
fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
||
buffer,
|
||
direntry->attributes,
|
||
begin_of_direntry(direntry),le32_to_cpu(direntry->size));
|
||
}
|
||
}
|
||
|
||
static void print_mapping(const mapping_t* mapping)
|
||
{
|
||
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);
|
||
if (mapping->mode & MODE_DIRECTORY)
|
||
fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
||
else
|
||
fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
||
}
|
||
#endif
|
||
|
||
static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
|
||
uint8_t *buf, int nb_sectors)
|
||
{
|
||
BDRVVVFATState *s = bs->opaque;
|
||
int i;
|
||
|
||
for(i=0;i<nb_sectors;i++,sector_num++) {
|
||
if (sector_num >= s->sector_count)
|
||
return -1;
|
||
if (s->qcow) {
|
||
int n;
|
||
if (s->qcow->drv->bdrv_is_allocated(s->qcow,
|
||
sector_num, nb_sectors-i, &n)) {
|
||
DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n));
|
||
if (s->qcow->drv->bdrv_read(s->qcow, sector_num, buf+i*0x200, n))
|
||
return -1;
|
||
i += n - 1;
|
||
sector_num += n - 1;
|
||
continue;
|
||
}
|
||
DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num));
|
||
}
|
||
if(sector_num<s->faked_sectors) {
|
||
if(sector_num<s->first_sectors_number)
|
||
memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200);
|
||
else if(sector_num-s->first_sectors_number<s->sectors_per_fat)
|
||
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200);
|
||
else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat)
|
||
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200);
|
||
} else {
|
||
uint32_t sector=sector_num-s->faked_sectors,
|
||
sector_offset_in_cluster=(sector%s->sectors_per_cluster),
|
||
cluster_num=sector/s->sectors_per_cluster;
|
||
if(read_cluster(s, cluster_num) != 0) {
|
||
/* LATER TODO: strict: return -1; */
|
||
memset(buf+i*0x200,0,0x200);
|
||
continue;
|
||
}
|
||
memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* LATER TODO: statify all functions */
|
||
|
||
/*
|
||
* Idea of the write support (use snapshot):
|
||
*
|
||
* 1. check if all data is consistent, recording renames, modifications,
|
||
* new files and directories (in s->commits).
|
||
*
|
||
* 2. if the data is not consistent, stop committing
|
||
*
|
||
* 3. handle renames, and create new files and directories (do not yet
|
||
* write their contents)
|
||
*
|
||
* 4. walk the directories, fixing the mapping and direntries, and marking
|
||
* the handled mappings as not deleted
|
||
*
|
||
* 5. commit the contents of the files
|
||
*
|
||
* 6. handle deleted files and directories
|
||
*
|
||
*/
|
||
|
||
typedef struct commit_t {
|
||
char* path;
|
||
union {
|
||
struct { uint32_t cluster; } rename;
|
||
struct { int dir_index; uint32_t modified_offset; } writeout;
|
||
struct { uint32_t first_cluster; } new_file;
|
||
struct { uint32_t cluster; } mkdir;
|
||
} param;
|
||
/* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
||
enum {
|
||
ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
|
||
} action;
|
||
} commit_t;
|
||
|
||
static void clear_commits(BDRVVVFATState* s)
|
||
{
|
||
int i;
|
||
DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
||
for (i = 0; i < s->commits.next; i++) {
|
||
commit_t* commit = array_get(&(s->commits), i);
|
||
assert(commit->path || commit->action == ACTION_WRITEOUT);
|
||
if (commit->action != ACTION_WRITEOUT) {
|
||
assert(commit->path);
|
||
free(commit->path);
|
||
} else
|
||
assert(commit->path == NULL);
|
||
}
|
||
s->commits.next = 0;
|
||
}
|
||
|
||
static void schedule_rename(BDRVVVFATState* s,
|
||
uint32_t cluster, char* new_path)
|
||
{
|
||
commit_t* commit = array_get_next(&(s->commits));
|
||
commit->path = new_path;
|
||
commit->param.rename.cluster = cluster;
|
||
commit->action = ACTION_RENAME;
|
||
}
|
||
|
||
static void schedule_writeout(BDRVVVFATState* s,
|
||
int dir_index, uint32_t modified_offset)
|
||
{
|
||
commit_t* commit = array_get_next(&(s->commits));
|
||
commit->path = NULL;
|
||
commit->param.writeout.dir_index = dir_index;
|
||
commit->param.writeout.modified_offset = modified_offset;
|
||
commit->action = ACTION_WRITEOUT;
|
||
}
|
||
|
||
static void schedule_new_file(BDRVVVFATState* s,
|
||
char* path, uint32_t first_cluster)
|
||
{
|
||
commit_t* commit = array_get_next(&(s->commits));
|
||
commit->path = path;
|
||
commit->param.new_file.first_cluster = first_cluster;
|
||
commit->action = ACTION_NEW_FILE;
|
||
}
|
||
|
||
static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
|
||
{
|
||
commit_t* commit = array_get_next(&(s->commits));
|
||
commit->path = path;
|
||
commit->param.mkdir.cluster = cluster;
|
||
commit->action = ACTION_MKDIR;
|
||
}
|
||
|
||
typedef struct {
|
||
unsigned char name[1024];
|
||
int checksum, len;
|
||
int sequence_number;
|
||
} long_file_name;
|
||
|
||
static void lfn_init(long_file_name* lfn)
|
||
{
|
||
lfn->sequence_number = lfn->len = 0;
|
||
lfn->checksum = 0x100;
|
||
}
|
||
|
||
/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
||
static int parse_long_name(long_file_name* lfn,
|
||
const direntry_t* direntry)
|
||
{
|
||
int i, j, offset;
|
||
const unsigned char* pointer = (const unsigned char*)direntry;
|
||
|
||
if (!is_long_name(direntry))
|
||
return 1;
|
||
|
||
if (pointer[0] & 0x40) {
|
||
lfn->sequence_number = pointer[0] & 0x3f;
|
||
lfn->checksum = pointer[13];
|
||
lfn->name[0] = 0;
|
||
} else if ((pointer[0] & 0x3f) != --lfn->sequence_number)
|
||
return -1;
|
||
else if (pointer[13] != lfn->checksum)
|
||
return -2;
|
||
else if (pointer[12] || pointer[26] || pointer[27])
|
||
return -3;
|
||
|
||
offset = 13 * (lfn->sequence_number - 1);
|
||
for (i = 0, j = 1; i < 13; i++, j+=2) {
|
||
if (j == 11)
|
||
j = 14;
|
||
else if (j == 26)
|
||
j = 28;
|
||
|
||
if (pointer[j+1] == 0)
|
||
lfn->name[offset + i] = pointer[j];
|
||
else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0)
|
||
return -4;
|
||
else
|
||
lfn->name[offset + i] = 0;
|
||
}
|
||
|
||
if (pointer[0] & 0x40)
|
||
lfn->len = offset + strlen((char*)lfn->name + offset);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* returns 0 if successful, >0 if no short_name, and <0 on error */
|
||
static int parse_short_name(BDRVVVFATState* s,
|
||
long_file_name* lfn, direntry_t* direntry)
|
||
{
|
||
int i, j;
|
||
|
||
if (!is_short_name(direntry))
|
||
return 1;
|
||
|
||
for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
|
||
for (i = 0; i <= j; i++) {
|
||
if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f)
|
||
return -1;
|
||
else if (s->downcase_short_names)
|
||
lfn->name[i] = tolower(direntry->name[i]);
|
||
else
|
||
lfn->name[i] = direntry->name[i];
|
||
}
|
||
|
||
for (j = 2; j >= 0 && direntry->extension[j] == ' '; j--);
|
||
if (j >= 0) {
|
||
lfn->name[i++] = '.';
|
||
lfn->name[i + j + 1] = '\0';
|
||
for (;j >= 0; j--) {
|
||
if (direntry->extension[j] <= ' ' || direntry->extension[j] > 0x7f)
|
||
return -2;
|
||
else if (s->downcase_short_names)
|
||
lfn->name[i + j] = tolower(direntry->extension[j]);
|
||
else
|
||
lfn->name[i + j] = direntry->extension[j];
|
||
}
|
||
} else
|
||
lfn->name[i + j + 1] = '\0';
|
||
|
||
lfn->len = strlen((char*)lfn->name);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static inline uint32_t modified_fat_get(BDRVVVFATState* s,
|
||
unsigned int cluster)
|
||
{
|
||
if (cluster < s->last_cluster_of_root_directory) {
|
||
if (cluster + 1 == s->last_cluster_of_root_directory)
|
||
return s->max_fat_value;
|
||
else
|
||
return cluster + 1;
|
||
}
|
||
|
||
if (s->fat_type==32) {
|
||
uint32_t* entry=((uint32_t*)s->fat2)+cluster;
|
||
return le32_to_cpu(*entry);
|
||
} else if (s->fat_type==16) {
|
||
uint16_t* entry=((uint16_t*)s->fat2)+cluster;
|
||
return le16_to_cpu(*entry);
|
||
} else {
|
||
const uint8_t* x=s->fat2+cluster*3/2;
|
||
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
|
||
}
|
||
}
|
||
|
||
static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num)
|
||
{
|
||
int was_modified = 0;
|
||
int i, dummy;
|
||
|
||
if (s->qcow == NULL)
|
||
return 0;
|
||
|
||
for (i = 0; !was_modified && i < s->sectors_per_cluster; i++)
|
||
was_modified = s->qcow->drv->bdrv_is_allocated(s->qcow,
|
||
cluster2sector(s, cluster_num) + i, 1, &dummy);
|
||
|
||
return was_modified;
|
||
}
|
||
|
||
static const char* get_basename(const char* path)
|
||
{
|
||
char* basename = strrchr(path, '/');
|
||
if (basename == NULL)
|
||
return path;
|
||
else
|
||
return basename + 1; /* strip '/' */
|
||
}
|
||
|
||
/*
|
||
* The array s->used_clusters holds the states of the clusters. If it is
|
||
* part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
||
* was modified, bit 3 is set.
|
||
* If any cluster is allocated, but not part of a file or directory, this
|
||
* driver refuses to commit.
|
||
*/
|
||
typedef enum {
|
||
USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
|
||
} used_t;
|
||
|
||
/*
|
||
* get_cluster_count_for_direntry() not only determines how many clusters
|
||
* are occupied by direntry, but also if it was renamed or modified.
|
||
*
|
||
* A file is thought to be renamed *only* if there already was a file with
|
||
* exactly the same first cluster, but a different name.
|
||
*
|
||
* Further, the files/directories handled by this function are
|
||
* assumed to be *not* deleted (and *only* those).
|
||
*/
|
||
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
||
direntry_t* direntry, const char* path)
|
||
{
|
||
/*
|
||
* This is a little bit tricky:
|
||
* IF the guest OS just inserts a cluster into the file chain,
|
||
* and leaves the rest alone, (i.e. the original file had clusters
|
||
* 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
||
*
|
||
* - do_commit will write the cluster into the file at the given
|
||
* offset, but
|
||
*
|
||
* - the cluster which is overwritten should be moved to a later
|
||
* position in the file.
|
||
*
|
||
* I am not aware that any OS does something as braindead, but this
|
||
* situation could happen anyway when not committing for a long time.
|
||
* Just to be sure that this does not bite us, detect it, and copy the
|
||
* contents of the clusters to-be-overwritten into the qcow.
|
||
*/
|
||
int copy_it = 0;
|
||
int was_modified = 0;
|
||
int32_t ret = 0;
|
||
|
||
uint32_t cluster_num = begin_of_direntry(direntry);
|
||
uint32_t offset = 0;
|
||
int first_mapping_index = -1;
|
||
mapping_t* mapping = NULL;
|
||
const char* basename2 = NULL;
|
||
|
||
vvfat_close_current_file(s);
|
||
|
||
/* the root directory */
|
||
if (cluster_num == 0)
|
||
return 0;
|
||
|
||
/* write support */
|
||
if (s->qcow) {
|
||
basename2 = get_basename(path);
|
||
|
||
mapping = find_mapping_for_cluster(s, cluster_num);
|
||
|
||
if (mapping) {
|
||
const char* basename;
|
||
|
||
assert(mapping->mode & MODE_DELETED);
|
||
mapping->mode &= ~MODE_DELETED;
|
||
|
||
basename = get_basename(mapping->path);
|
||
|
||
assert(mapping->mode & MODE_NORMAL);
|
||
|
||
/* rename */
|
||
if (strcmp(basename, basename2))
|
||
schedule_rename(s, cluster_num, strdup(path));
|
||
} else if (is_file(direntry))
|
||
/* new file */
|
||
schedule_new_file(s, strdup(path), cluster_num);
|
||
else {
|
||
assert(0);
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
while(1) {
|
||
if (s->qcow) {
|
||
if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
||
if (mapping == NULL ||
|
||
mapping->begin > cluster_num ||
|
||
mapping->end <= cluster_num)
|
||
mapping = find_mapping_for_cluster(s, cluster_num);
|
||
|
||
|
||
if (mapping &&
|
||
(mapping->mode & MODE_DIRECTORY) == 0) {
|
||
|
||
/* was modified in qcow */
|
||
if (offset != mapping->info.file.offset + s->cluster_size
|
||
* (cluster_num - mapping->begin)) {
|
||
/* offset of this cluster in file chain has changed */
|
||
assert(0);
|
||
copy_it = 1;
|
||
} else if (offset == 0) {
|
||
const char* basename = get_basename(mapping->path);
|
||
|
||
if (strcmp(basename, basename2))
|
||
copy_it = 1;
|
||
first_mapping_index = array_index(&(s->mapping), mapping);
|
||
}
|
||
|
||
if (mapping->first_mapping_index != first_mapping_index
|
||
&& mapping->info.file.offset > 0) {
|
||
assert(0);
|
||
copy_it = 1;
|
||
}
|
||
|
||
/* need to write out? */
|
||
if (!was_modified && is_file(direntry)) {
|
||
was_modified = 1;
|
||
schedule_writeout(s, mapping->dir_index, offset);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (copy_it) {
|
||
int i, dummy;
|
||
/*
|
||
* This is horribly inefficient, but that is okay, since
|
||
* it is rarely executed, if at all.
|
||
*/
|
||
int64_t offset = cluster2sector(s, cluster_num);
|
||
|
||
vvfat_close_current_file(s);
|
||
for (i = 0; i < s->sectors_per_cluster; i++)
|
||
if (!s->qcow->drv->bdrv_is_allocated(s->qcow,
|
||
offset + i, 1, &dummy)) {
|
||
if (vvfat_read(s->bs,
|
||
offset, s->cluster_buffer, 1))
|
||
return -1;
|
||
if (s->qcow->drv->bdrv_write(s->qcow,
|
||
offset, s->cluster_buffer, 1))
|
||
return -2;
|
||
}
|
||
}
|
||
}
|
||
|
||
ret++;
|
||
if (s->used_clusters[cluster_num] & USED_ANY)
|
||
return 0;
|
||
s->used_clusters[cluster_num] = USED_FILE;
|
||
|
||
cluster_num = modified_fat_get(s, cluster_num);
|
||
|
||
if (fat_eof(s, cluster_num))
|
||
return ret;
|
||
else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
|
||
return -1;
|
||
|
||
offset += s->cluster_size;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* This function looks at the modified data (qcow).
|
||
* It returns 0 upon inconsistency or error, and the number of clusters
|
||
* used by the directory, its subdirectories and their files.
|
||
*/
|
||
static int check_directory_consistency(BDRVVVFATState *s,
|
||
int cluster_num, const char* path)
|
||
{
|
||
int ret = 0;
|
||
unsigned char* cluster = malloc(s->cluster_size);
|
||
direntry_t* direntries = (direntry_t*)cluster;
|
||
mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
|
||
|
||
long_file_name lfn;
|
||
int path_len = strlen(path);
|
||
char path2[PATH_MAX];
|
||
|
||
assert(path_len < PATH_MAX); /* len was tested before! */
|
||
strcpy(path2, path);
|
||
path2[path_len] = '/';
|
||
path2[path_len + 1] = '\0';
|
||
|
||
if (mapping) {
|
||
const char* basename = get_basename(mapping->path);
|
||
const char* basename2 = get_basename(path);
|
||
|
||
assert(mapping->mode & MODE_DIRECTORY);
|
||
|
||
assert(mapping->mode & MODE_DELETED);
|
||
mapping->mode &= ~MODE_DELETED;
|
||
|
||
if (strcmp(basename, basename2))
|
||
schedule_rename(s, cluster_num, strdup(path));
|
||
} else
|
||
/* new directory */
|
||
schedule_mkdir(s, cluster_num, strdup(path));
|
||
|
||
lfn_init(&lfn);
|
||
do {
|
||
int i;
|
||
int subret = 0;
|
||
|
||
ret++;
|
||
|
||
if (s->used_clusters[cluster_num] & USED_ANY) {
|
||
fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
|
||
return 0;
|
||
}
|
||
s->used_clusters[cluster_num] = USED_DIRECTORY;
|
||
|
||
DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
|
||
subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
|
||
s->sectors_per_cluster);
|
||
if (subret) {
|
||
fprintf(stderr, "Error fetching direntries\n");
|
||
fail:
|
||
free(cluster);
|
||
return 0;
|
||
}
|
||
|
||
for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
|
||
int cluster_count;
|
||
|
||
DLOG(fprintf(stderr, "check direntry %d: \n", i); print_direntry(direntries + i));
|
||
if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
||
is_free(direntries + i))
|
||
continue;
|
||
|
||
subret = parse_long_name(&lfn, direntries + i);
|
||
if (subret < 0) {
|
||
fprintf(stderr, "Error in long name\n");
|
||
goto fail;
|
||
}
|
||
if (subret == 0 || is_free(direntries + i))
|
||
continue;
|
||
|
||
if (fat_chksum(direntries+i) != lfn.checksum) {
|
||
subret = parse_short_name(s, &lfn, direntries + i);
|
||
if (subret < 0) {
|
||
fprintf(stderr, "Error in short name (%d)\n", subret);
|
||
goto fail;
|
||
}
|
||
if (subret > 0 || !strcmp((char*)lfn.name, ".")
|
||
|| !strcmp((char*)lfn.name, ".."))
|
||
continue;
|
||
}
|
||
lfn.checksum = 0x100; /* cannot use long name twice */
|
||
|
||
if (path_len + 1 + lfn.len >= PATH_MAX) {
|
||
fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
||
goto fail;
|
||
}
|
||
strcpy(path2 + path_len + 1, (char*)lfn.name);
|
||
|
||
if (is_directory(direntries + i)) {
|
||
if (begin_of_direntry(direntries + i) == 0) {
|
||
DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
||
goto fail;
|
||
}
|
||
cluster_count = check_directory_consistency(s,
|
||
begin_of_direntry(direntries + i), path2);
|
||
if (cluster_count == 0) {
|
||
DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
||
goto fail;
|
||
}
|
||
} else if (is_file(direntries + i)) {
|
||
/* check file size with FAT */
|
||
cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2);
|
||
if (cluster_count !=
|
||
(le32_to_cpu(direntries[i].size) + s->cluster_size
|
||
- 1) / s->cluster_size) {
|
||
DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
||
goto fail;
|
||
}
|
||
} else
|
||
assert(0); /* cluster_count = 0; */
|
||
|
||
ret += cluster_count;
|
||
}
|
||
|
||
cluster_num = modified_fat_get(s, cluster_num);
|
||
} while(!fat_eof(s, cluster_num));
|
||
|
||
free(cluster);
|
||
return ret;
|
||
}
|
||
|
||
/* returns 1 on success */
|
||
static int is_consistent(BDRVVVFATState* s)
|
||
{
|
||
int i, check;
|
||
int used_clusters_count = 0;
|
||
|
||
DLOG(checkpoint());
|
||
/*
|
||
* - get modified FAT
|
||
* - compare the two FATs (TODO)
|
||
* - get buffer for marking used clusters
|
||
* - recurse direntries from root (using bs->bdrv_read to make
|
||
* sure to get the new data)
|
||
* - check that the FAT agrees with the size
|
||
* - count the number of clusters occupied by this directory and
|
||
* its files
|
||
* - check that the cumulative used cluster count agrees with the
|
||
* FAT
|
||
* - if all is fine, return number of used clusters
|
||
*/
|
||
if (s->fat2 == NULL) {
|
||
int size = 0x200 * s->sectors_per_fat;
|
||
s->fat2 = malloc(size);
|
||
memcpy(s->fat2, s->fat.pointer, size);
|
||
}
|
||
check = vvfat_read(s->bs,
|
||
s->first_sectors_number, s->fat2, s->sectors_per_fat);
|
||
if (check) {
|
||
fprintf(stderr, "Could not copy fat\n");
|
||
return 0;
|
||
}
|
||
assert (s->used_clusters);
|
||
for (i = 0; i < sector2cluster(s, s->sector_count); i++)
|
||
s->used_clusters[i] &= ~USED_ANY;
|
||
|
||
clear_commits(s);
|
||
|
||
/* mark every mapped file/directory as deleted.
|
||
* (check_directory_consistency() will unmark those still present). */
|
||
if (s->qcow)
|
||
for (i = 0; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
if (mapping->first_mapping_index < 0)
|
||
mapping->mode |= MODE_DELETED;
|
||
}
|
||
|
||
used_clusters_count = check_directory_consistency(s, 0, s->path);
|
||
if (used_clusters_count <= 0) {
|
||
DLOG(fprintf(stderr, "problem in directory\n"));
|
||
return 0;
|
||
}
|
||
|
||
check = s->last_cluster_of_root_directory;
|
||
for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
||
if (modified_fat_get(s, i)) {
|
||
if(!s->used_clusters[i]) {
|
||
DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
||
return 0;
|
||
}
|
||
check++;
|
||
}
|
||
|
||
if (s->used_clusters[i] == USED_ALLOCATED) {
|
||
/* allocated, but not used... */
|
||
DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (check != used_clusters_count)
|
||
return 0;
|
||
|
||
return used_clusters_count;
|
||
}
|
||
|
||
static inline void adjust_mapping_indices(BDRVVVFATState* s,
|
||
int offset, int adjust)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
|
||
#define ADJUST_MAPPING_INDEX(name) \
|
||
if (mapping->name >= offset) \
|
||
mapping->name += adjust
|
||
|
||
ADJUST_MAPPING_INDEX(first_mapping_index);
|
||
if (mapping->mode & MODE_DIRECTORY)
|
||
ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
|
||
}
|
||
}
|
||
|
||
/* insert or update mapping */
|
||
static mapping_t* insert_mapping(BDRVVVFATState* s,
|
||
uint32_t begin, uint32_t end)
|
||
{
|
||
/*
|
||
* - find mapping where mapping->begin >= begin,
|
||
* - if mapping->begin > begin: insert
|
||
* - adjust all references to mappings!
|
||
* - else: adjust
|
||
* - replace name
|
||
*/
|
||
int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
|
||
mapping_t* mapping = NULL;
|
||
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
||
|
||
if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
||
&& mapping->begin < begin) {
|
||
mapping->end = begin;
|
||
index++;
|
||
mapping = array_get(&(s->mapping), index);
|
||
}
|
||
if (index >= s->mapping.next || mapping->begin > begin) {
|
||
mapping = array_insert(&(s->mapping), index, 1);
|
||
mapping->path = NULL;
|
||
adjust_mapping_indices(s, index, +1);
|
||
}
|
||
|
||
mapping->begin = begin;
|
||
mapping->end = end;
|
||
|
||
DLOG(mapping_t* next_mapping;
|
||
assert(index + 1 >= s->mapping.next ||
|
||
((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
||
next_mapping->begin >= end)));
|
||
|
||
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
||
s->current_mapping = array_get(&(s->mapping),
|
||
s->current_mapping - first_mapping);
|
||
|
||
return mapping;
|
||
}
|
||
|
||
static int remove_mapping(BDRVVVFATState* s, int mapping_index)
|
||
{
|
||
mapping_t* mapping = array_get(&(s->mapping), mapping_index);
|
||
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
||
|
||
/* free mapping */
|
||
if (mapping->first_mapping_index < 0)
|
||
free(mapping->path);
|
||
|
||
/* remove from s->mapping */
|
||
array_remove(&(s->mapping), mapping_index);
|
||
|
||
/* adjust all references to mappings */
|
||
adjust_mapping_indices(s, mapping_index, -1);
|
||
|
||
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
||
s->current_mapping = array_get(&(s->mapping),
|
||
s->current_mapping - first_mapping);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust)
|
||
{
|
||
int i;
|
||
for (i = 0; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
if (mapping->dir_index >= offset)
|
||
mapping->dir_index += adjust;
|
||
if ((mapping->mode & MODE_DIRECTORY) &&
|
||
mapping->info.dir.first_dir_index >= offset)
|
||
mapping->info.dir.first_dir_index += adjust;
|
||
}
|
||
}
|
||
|
||
static direntry_t* insert_direntries(BDRVVVFATState* s,
|
||
int dir_index, int count)
|
||
{
|
||
/*
|
||
* make room in s->directory,
|
||
* adjust_dirindices
|
||
*/
|
||
direntry_t* result = array_insert(&(s->directory), dir_index, count);
|
||
if (result == NULL)
|
||
return NULL;
|
||
adjust_dirindices(s, dir_index, count);
|
||
return result;
|
||
}
|
||
|
||
static int remove_direntries(BDRVVVFATState* s, int dir_index, int count)
|
||
{
|
||
int ret = array_remove_slice(&(s->directory), dir_index, count);
|
||
if (ret)
|
||
return ret;
|
||
adjust_dirindices(s, dir_index, -count);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Adapt the mappings of the cluster chain starting at first cluster
|
||
* (i.e. if a file starts at first_cluster, the chain is followed according
|
||
* to the modified fat, and the corresponding entries in s->mapping are
|
||
* adjusted)
|
||
*/
|
||
static int commit_mappings(BDRVVVFATState* s,
|
||
uint32_t first_cluster, int dir_index)
|
||
{
|
||
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
|
||
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
||
uint32_t cluster = first_cluster;
|
||
|
||
vvfat_close_current_file(s);
|
||
|
||
assert(mapping);
|
||
assert(mapping->begin == first_cluster);
|
||
mapping->first_mapping_index = -1;
|
||
mapping->dir_index = dir_index;
|
||
mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
||
MODE_DIRECTORY : MODE_NORMAL;
|
||
|
||
while (!fat_eof(s, cluster)) {
|
||
uint32_t c, c1;
|
||
|
||
for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1;
|
||
c = c1, c1 = modified_fat_get(s, c1));
|
||
|
||
c++;
|
||
if (c > mapping->end) {
|
||
int index = array_index(&(s->mapping), mapping);
|
||
int i, max_i = s->mapping.next - index;
|
||
for (i = 1; i < max_i && mapping[i].begin < c; i++);
|
||
while (--i > 0)
|
||
remove_mapping(s, index + 1);
|
||
}
|
||
assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
||
|| mapping[1].begin >= c);
|
||
mapping->end = c;
|
||
|
||
if (!fat_eof(s, c1)) {
|
||
int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next);
|
||
mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
||
array_get(&(s->mapping), i);
|
||
|
||
if (next_mapping == NULL || next_mapping->begin > c1) {
|
||
int i1 = array_index(&(s->mapping), mapping);
|
||
|
||
next_mapping = insert_mapping(s, c1, c1+1);
|
||
|
||
if (c1 < c)
|
||
i1++;
|
||
mapping = array_get(&(s->mapping), i1);
|
||
}
|
||
|
||
next_mapping->dir_index = mapping->dir_index;
|
||
next_mapping->first_mapping_index =
|
||
mapping->first_mapping_index < 0 ?
|
||
array_index(&(s->mapping), mapping) :
|
||
mapping->first_mapping_index;
|
||
next_mapping->path = mapping->path;
|
||
next_mapping->mode = mapping->mode;
|
||
next_mapping->read_only = mapping->read_only;
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
next_mapping->info.dir.parent_mapping_index =
|
||
mapping->info.dir.parent_mapping_index;
|
||
next_mapping->info.dir.first_dir_index =
|
||
mapping->info.dir.first_dir_index +
|
||
0x10 * s->sectors_per_cluster *
|
||
(mapping->end - mapping->begin);
|
||
} else
|
||
next_mapping->info.file.offset = mapping->info.file.offset +
|
||
mapping->end - mapping->begin;
|
||
|
||
mapping = next_mapping;
|
||
}
|
||
|
||
cluster = c1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int commit_direntries(BDRVVVFATState* s,
|
||
int dir_index, int parent_mapping_index)
|
||
{
|
||
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
||
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
|
||
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
|
||
|
||
int factor = 0x10 * s->sectors_per_cluster;
|
||
int old_cluster_count, new_cluster_count;
|
||
int current_dir_index = mapping->info.dir.first_dir_index;
|
||
int first_dir_index = current_dir_index;
|
||
int ret, i;
|
||
uint32_t c;
|
||
|
||
DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
||
|
||
assert(direntry);
|
||
assert(mapping);
|
||
assert(mapping->begin == first_cluster);
|
||
assert(mapping->info.dir.first_dir_index < s->directory.next);
|
||
assert(mapping->mode & MODE_DIRECTORY);
|
||
assert(dir_index == 0 || is_directory(direntry));
|
||
|
||
mapping->info.dir.parent_mapping_index = parent_mapping_index;
|
||
|
||
if (first_cluster == 0) {
|
||
old_cluster_count = new_cluster_count =
|
||
s->last_cluster_of_root_directory;
|
||
} else {
|
||
for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
|
||
c = fat_get(s, c))
|
||
old_cluster_count++;
|
||
|
||
for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
|
||
c = modified_fat_get(s, c))
|
||
new_cluster_count++;
|
||
}
|
||
|
||
if (new_cluster_count > old_cluster_count) {
|
||
if (insert_direntries(s,
|
||
current_dir_index + factor * old_cluster_count,
|
||
factor * (new_cluster_count - old_cluster_count)) == NULL)
|
||
return -1;
|
||
} else if (new_cluster_count < old_cluster_count)
|
||
remove_direntries(s,
|
||
current_dir_index + factor * new_cluster_count,
|
||
factor * (old_cluster_count - new_cluster_count));
|
||
|
||
for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
||
void* direntry = array_get(&(s->directory), current_dir_index);
|
||
int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
||
s->sectors_per_cluster);
|
||
if (ret)
|
||
return ret;
|
||
assert(!strncmp(s->directory.pointer, "QEMU", 4));
|
||
current_dir_index += factor;
|
||
}
|
||
|
||
ret = commit_mappings(s, first_cluster, dir_index);
|
||
if (ret)
|
||
return ret;
|
||
|
||
/* recurse */
|
||
for (i = 0; i < factor * new_cluster_count; i++) {
|
||
direntry = array_get(&(s->directory), first_dir_index + i);
|
||
if (is_directory(direntry) && !is_dot(direntry)) {
|
||
mapping = find_mapping_for_cluster(s, first_cluster);
|
||
assert(mapping->mode & MODE_DIRECTORY);
|
||
ret = commit_direntries(s, first_dir_index + i,
|
||
array_index(&(s->mapping), mapping));
|
||
if (ret)
|
||
return ret;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* commit one file (adjust contents, adjust mapping),
|
||
return first_mapping_index */
|
||
static int commit_one_file(BDRVVVFATState* s,
|
||
int dir_index, uint32_t offset)
|
||
{
|
||
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
||
uint32_t c = begin_of_direntry(direntry);
|
||
uint32_t first_cluster = c;
|
||
mapping_t* mapping = find_mapping_for_cluster(s, c);
|
||
uint32_t size = filesize_of_direntry(direntry);
|
||
char* cluster = malloc(s->cluster_size);
|
||
uint32_t i;
|
||
int fd = 0;
|
||
|
||
assert(offset < size);
|
||
assert((offset % s->cluster_size) == 0);
|
||
|
||
for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
||
c = modified_fat_get(s, c);
|
||
|
||
fd = open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
|
||
if (fd < 0) {
|
||
fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
||
strerror(errno), errno);
|
||
return fd;
|
||
}
|
||
if (offset > 0)
|
||
if (lseek(fd, offset, SEEK_SET) != offset)
|
||
return -3;
|
||
|
||
while (offset < size) {
|
||
uint32_t c1;
|
||
int rest_size = (size - offset > s->cluster_size ?
|
||
s->cluster_size : size - offset);
|
||
int ret;
|
||
|
||
c1 = modified_fat_get(s, c);
|
||
|
||
assert((size - offset == 0 && fat_eof(s, c)) ||
|
||
(size > offset && c >=2 && !fat_eof(s, c)));
|
||
assert(size >= 0);
|
||
|
||
ret = vvfat_read(s->bs, cluster2sector(s, c),
|
||
(uint8_t*)cluster, (rest_size + 0x1ff) / 0x200);
|
||
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
if (write(fd, cluster, rest_size) < 0)
|
||
return -2;
|
||
|
||
offset += rest_size;
|
||
c = c1;
|
||
}
|
||
|
||
ftruncate(fd, size);
|
||
close(fd);
|
||
|
||
return commit_mappings(s, first_cluster, dir_index);
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
/* test, if all mappings point to valid direntries */
|
||
static void check1(BDRVVVFATState* s)
|
||
{
|
||
int i;
|
||
for (i = 0; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
if (mapping->mode & MODE_DELETED) {
|
||
fprintf(stderr, "deleted\n");
|
||
continue;
|
||
}
|
||
assert(mapping->dir_index >= 0);
|
||
assert(mapping->dir_index < s->directory.next);
|
||
direntry_t* direntry = array_get(&(s->directory), mapping->dir_index);
|
||
assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
||
assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* test, if all direntries have mappings */
|
||
static void check2(BDRVVVFATState* s)
|
||
{
|
||
int i;
|
||
int first_mapping = -1;
|
||
|
||
for (i = 0; i < s->directory.next; i++) {
|
||
direntry_t* direntry = array_get(&(s->directory), i);
|
||
|
||
if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
||
mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry));
|
||
assert(mapping);
|
||
assert(mapping->dir_index == i || is_dot(direntry));
|
||
assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry));
|
||
}
|
||
|
||
if ((i % (0x10 * s->sectors_per_cluster)) == 0) {
|
||
/* cluster start */
|
||
int j, count = 0;
|
||
|
||
for (j = 0; j < s->mapping.next; j++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), j);
|
||
if (mapping->mode & MODE_DELETED)
|
||
continue;
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) {
|
||
assert(++count == 1);
|
||
if (mapping->first_mapping_index == -1)
|
||
first_mapping = array_index(&(s->mapping), mapping);
|
||
else
|
||
assert(first_mapping == mapping->first_mapping_index);
|
||
if (mapping->info.dir.parent_mapping_index < 0)
|
||
assert(j == 0);
|
||
else {
|
||
mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index);
|
||
assert(parent->mode & MODE_DIRECTORY);
|
||
assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if (count == 0)
|
||
first_mapping = -1;
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
|
||
static int handle_renames_and_mkdirs(BDRVVVFATState* s)
|
||
{
|
||
int i;
|
||
|
||
#ifdef DEBUG
|
||
fprintf(stderr, "handle_renames\n");
|
||
for (i = 0; i < s->commits.next; i++) {
|
||
commit_t* commit = array_get(&(s->commits), i);
|
||
fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action);
|
||
}
|
||
#endif
|
||
|
||
for (i = 0; i < s->commits.next;) {
|
||
commit_t* commit = array_get(&(s->commits), i);
|
||
if (commit->action == ACTION_RENAME) {
|
||
mapping_t* mapping = find_mapping_for_cluster(s,
|
||
commit->param.rename.cluster);
|
||
char* old_path = mapping->path;
|
||
|
||
assert(commit->path);
|
||
mapping->path = commit->path;
|
||
if (rename(old_path, mapping->path))
|
||
return -2;
|
||
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
int l1 = strlen(mapping->path);
|
||
int l2 = strlen(old_path);
|
||
int diff = l1 - l2;
|
||
direntry_t* direntry = array_get(&(s->directory),
|
||
mapping->info.dir.first_dir_index);
|
||
uint32_t c = mapping->begin;
|
||
int i = 0;
|
||
|
||
/* recurse */
|
||
while (!fat_eof(s, c)) {
|
||
do {
|
||
direntry_t* d = direntry + i;
|
||
|
||
if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
||
mapping_t* m = find_mapping_for_cluster(s,
|
||
begin_of_direntry(d));
|
||
int l = strlen(m->path);
|
||
char* new_path = malloc(l + diff + 1);
|
||
|
||
assert(!strncmp(m->path, mapping->path, l2));
|
||
|
||
strcpy(new_path, mapping->path);
|
||
strcpy(new_path + l1, m->path + l2);
|
||
|
||
schedule_rename(s, m->begin, new_path);
|
||
}
|
||
i++;
|
||
} while((i % (0x10 * s->sectors_per_cluster)) != 0);
|
||
c = fat_get(s, c);
|
||
}
|
||
}
|
||
|
||
free(old_path);
|
||
array_remove(&(s->commits), i);
|
||
continue;
|
||
} else if (commit->action == ACTION_MKDIR) {
|
||
mapping_t* mapping;
|
||
int j, parent_path_len;
|
||
|
||
#ifdef __MINGW32__
|
||
if (mkdir(commit->path))
|
||
return -5;
|
||
#else
|
||
if (mkdir(commit->path, 0755))
|
||
return -5;
|
||
#endif
|
||
|
||
mapping = insert_mapping(s, commit->param.mkdir.cluster,
|
||
commit->param.mkdir.cluster + 1);
|
||
if (mapping == NULL)
|
||
return -6;
|
||
|
||
mapping->mode = MODE_DIRECTORY;
|
||
mapping->read_only = 0;
|
||
mapping->path = commit->path;
|
||
j = s->directory.next;
|
||
assert(j);
|
||
insert_direntries(s, s->directory.next,
|
||
0x10 * s->sectors_per_cluster);
|
||
mapping->info.dir.first_dir_index = j;
|
||
|
||
parent_path_len = strlen(commit->path)
|
||
- strlen(get_basename(commit->path)) - 1;
|
||
for (j = 0; j < s->mapping.next; j++) {
|
||
mapping_t* m = array_get(&(s->mapping), j);
|
||
if (m->first_mapping_index < 0 && m != mapping &&
|
||
!strncmp(m->path, mapping->path, parent_path_len) &&
|
||
strlen(m->path) == parent_path_len)
|
||
break;
|
||
}
|
||
assert(j < s->mapping.next);
|
||
mapping->info.dir.parent_mapping_index = j;
|
||
|
||
array_remove(&(s->commits), i);
|
||
continue;
|
||
}
|
||
|
||
i++;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* TODO: make sure that the short name is not matching *another* file
|
||
*/
|
||
static int handle_commits(BDRVVVFATState* s)
|
||
{
|
||
int i, fail = 0;
|
||
|
||
vvfat_close_current_file(s);
|
||
|
||
for (i = 0; !fail && i < s->commits.next; i++) {
|
||
commit_t* commit = array_get(&(s->commits), i);
|
||
switch(commit->action) {
|
||
case ACTION_RENAME: case ACTION_MKDIR:
|
||
assert(0);
|
||
fail = -2;
|
||
break;
|
||
case ACTION_WRITEOUT: {
|
||
direntry_t* entry = array_get(&(s->directory),
|
||
commit->param.writeout.dir_index);
|
||
uint32_t begin = begin_of_direntry(entry);
|
||
mapping_t* mapping = find_mapping_for_cluster(s, begin);
|
||
|
||
assert(mapping);
|
||
assert(mapping->begin == begin);
|
||
assert(commit->path == NULL);
|
||
|
||
if (commit_one_file(s, commit->param.writeout.dir_index,
|
||
commit->param.writeout.modified_offset))
|
||
fail = -3;
|
||
|
||
break;
|
||
}
|
||
case ACTION_NEW_FILE: {
|
||
int begin = commit->param.new_file.first_cluster;
|
||
mapping_t* mapping = find_mapping_for_cluster(s, begin);
|
||
direntry_t* entry;
|
||
int i;
|
||
|
||
/* find direntry */
|
||
for (i = 0; i < s->directory.next; i++) {
|
||
entry = array_get(&(s->directory), i);
|
||
if (is_file(entry) && begin_of_direntry(entry) == begin)
|
||
break;
|
||
}
|
||
|
||
if (i >= s->directory.next) {
|
||
fail = -6;
|
||
continue;
|
||
}
|
||
|
||
/* make sure there exists an initial mapping */
|
||
if (mapping && mapping->begin != begin) {
|
||
mapping->end = begin;
|
||
mapping = NULL;
|
||
}
|
||
if (mapping == NULL) {
|
||
mapping = insert_mapping(s, begin, begin+1);
|
||
}
|
||
/* most members will be fixed in commit_mappings() */
|
||
assert(commit->path);
|
||
mapping->path = commit->path;
|
||
mapping->read_only = 0;
|
||
mapping->mode = MODE_NORMAL;
|
||
mapping->info.file.offset = 0;
|
||
|
||
if (commit_one_file(s, i, 0))
|
||
fail = -7;
|
||
|
||
break;
|
||
}
|
||
default:
|
||
assert(0);
|
||
}
|
||
}
|
||
if (i > 0 && array_remove_slice(&(s->commits), 0, i))
|
||
return -1;
|
||
return fail;
|
||
}
|
||
|
||
static int handle_deletes(BDRVVVFATState* s)
|
||
{
|
||
int i, deferred = 1, deleted = 1;
|
||
|
||
/* delete files corresponding to mappings marked as deleted */
|
||
/* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
||
while (deferred && deleted) {
|
||
deferred = 0;
|
||
deleted = 0;
|
||
|
||
for (i = 1; i < s->mapping.next; i++) {
|
||
mapping_t* mapping = array_get(&(s->mapping), i);
|
||
if (mapping->mode & MODE_DELETED) {
|
||
direntry_t* entry = array_get(&(s->directory),
|
||
mapping->dir_index);
|
||
|
||
if (is_free(entry)) {
|
||
/* remove file/directory */
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
int j, next_dir_index = s->directory.next,
|
||
first_dir_index = mapping->info.dir.first_dir_index;
|
||
|
||
if (rmdir(mapping->path) < 0) {
|
||
if (errno == ENOTEMPTY) {
|
||
deferred++;
|
||
continue;
|
||
} else
|
||
return -5;
|
||
}
|
||
|
||
for (j = 1; j < s->mapping.next; j++) {
|
||
mapping_t* m = array_get(&(s->mapping), j);
|
||
if (m->mode & MODE_DIRECTORY &&
|
||
m->info.dir.first_dir_index >
|
||
first_dir_index &&
|
||
m->info.dir.first_dir_index <
|
||
next_dir_index)
|
||
next_dir_index =
|
||
m->info.dir.first_dir_index;
|
||
}
|
||
remove_direntries(s, first_dir_index,
|
||
next_dir_index - first_dir_index);
|
||
|
||
deleted++;
|
||
}
|
||
} else {
|
||
if (unlink(mapping->path))
|
||
return -4;
|
||
deleted++;
|
||
}
|
||
DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
||
remove_mapping(s, i);
|
||
}
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* synchronize mapping with new state:
|
||
*
|
||
* - copy FAT (with bdrv_read)
|
||
* - mark all filenames corresponding to mappings as deleted
|
||
* - recurse direntries from root (using bs->bdrv_read)
|
||
* - delete files corresponding to mappings marked as deleted
|
||
*/
|
||
static int do_commit(BDRVVVFATState* s)
|
||
{
|
||
int ret = 0;
|
||
|
||
/* the real meat are the commits. Nothing to do? Move along! */
|
||
if (s->commits.next == 0)
|
||
return 0;
|
||
|
||
vvfat_close_current_file(s);
|
||
|
||
ret = handle_renames_and_mkdirs(s);
|
||
if (ret) {
|
||
fprintf(stderr, "Error handling renames (%d)\n", ret);
|
||
assert(0);
|
||
return ret;
|
||
}
|
||
|
||
/* copy FAT (with bdrv_read) */
|
||
memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
||
|
||
/* recurse direntries from root (using bs->bdrv_read) */
|
||
ret = commit_direntries(s, 0, -1);
|
||
if (ret) {
|
||
fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
||
assert(0);
|
||
return ret;
|
||
}
|
||
|
||
ret = handle_commits(s);
|
||
if (ret) {
|
||
fprintf(stderr, "Error handling commits (%d)\n", ret);
|
||
assert(0);
|
||
return ret;
|
||
}
|
||
|
||
ret = handle_deletes(s);
|
||
if (ret) {
|
||
fprintf(stderr, "Error deleting\n");
|
||
assert(0);
|
||
return ret;
|
||
}
|
||
|
||
s->qcow->drv->bdrv_make_empty(s->qcow);
|
||
|
||
memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
||
|
||
DLOG(checkpoint());
|
||
return 0;
|
||
}
|
||
|
||
static int try_commit(BDRVVVFATState* s)
|
||
{
|
||
vvfat_close_current_file(s);
|
||
DLOG(checkpoint());
|
||
if(!is_consistent(s))
|
||
return -1;
|
||
return do_commit(s);
|
||
}
|
||
|
||
static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
|
||
const uint8_t *buf, int nb_sectors)
|
||
{
|
||
BDRVVVFATState *s = bs->opaque;
|
||
int i, ret;
|
||
|
||
DLOG(checkpoint());
|
||
|
||
vvfat_close_current_file(s);
|
||
|
||
/*
|
||
* Some sanity checks:
|
||
* - do not allow writing to the boot sector
|
||
* - do not allow to write non-ASCII filenames
|
||
*/
|
||
|
||
if (sector_num < s->first_sectors_number)
|
||
return -1;
|
||
|
||
for (i = sector2cluster(s, sector_num);
|
||
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
||
mapping_t* mapping = find_mapping_for_cluster(s, i);
|
||
if (mapping) {
|
||
if (mapping->read_only) {
|
||
fprintf(stderr, "Tried to write to write-protected file %s\n",
|
||
mapping->path);
|
||
return -1;
|
||
}
|
||
|
||
if (mapping->mode & MODE_DIRECTORY) {
|
||
int begin = cluster2sector(s, i);
|
||
int end = begin + s->sectors_per_cluster, k;
|
||
int dir_index;
|
||
const direntry_t* direntries;
|
||
long_file_name lfn;
|
||
|
||
lfn_init(&lfn);
|
||
|
||
if (begin < sector_num)
|
||
begin = sector_num;
|
||
if (end > sector_num + nb_sectors)
|
||
end = sector_num + nb_sectors;
|
||
dir_index = mapping->dir_index +
|
||
0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
||
direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
||
|
||
for (k = 0; k < (end - begin) * 0x10; k++) {
|
||
/* do not allow non-ASCII filenames */
|
||
if (parse_long_name(&lfn, direntries + k) < 0) {
|
||
fprintf(stderr, "Warning: non-ASCII filename\n");
|
||
return -1;
|
||
}
|
||
/* no access to the direntry of a read-only file */
|
||
else if (is_short_name(direntries+k) &&
|
||
(direntries[k].attributes & 1)) {
|
||
if (memcmp(direntries + k,
|
||
array_get(&(s->directory), dir_index + k),
|
||
sizeof(direntry_t))) {
|
||
fprintf(stderr, "Warning: tried to write to write-protected file\n");
|
||
return -1;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
i = mapping->end;
|
||
} else
|
||
i++;
|
||
}
|
||
|
||
/*
|
||
* Use qcow backend. Commit later.
|
||
*/
|
||
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
|
||
ret = s->qcow->drv->bdrv_write(s->qcow, sector_num, buf, nb_sectors);
|
||
if (ret < 0) {
|
||
fprintf(stderr, "Error writing to qcow backend\n");
|
||
return ret;
|
||
}
|
||
|
||
for (i = sector2cluster(s, sector_num);
|
||
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
||
if (i >= 0)
|
||
s->used_clusters[i] |= USED_ALLOCATED;
|
||
|
||
DLOG(checkpoint());
|
||
/* TODO: add timeout */
|
||
try_commit(s);
|
||
|
||
DLOG(checkpoint());
|
||
return 0;
|
||
}
|
||
|
||
static int vvfat_is_allocated(BlockDriverState *bs,
|
||
int64_t sector_num, int nb_sectors, int* n)
|
||
{
|
||
BDRVVVFATState* s = bs->opaque;
|
||
*n = s->sector_count - sector_num;
|
||
if (*n > nb_sectors)
|
||
*n = nb_sectors;
|
||
else if (*n < 0)
|
||
return 0;
|
||
return 1;
|
||
}
|
||
|
||
static int write_target_commit(BlockDriverState *bs, int64_t sector_num,
|
||
const uint8_t* buffer, int nb_sectors) {
|
||
BDRVVVFATState* s = bs->opaque;
|
||
return try_commit(s);
|
||
}
|
||
|
||
static void write_target_close(BlockDriverState *bs) {
|
||
BDRVVVFATState* s = bs->opaque;
|
||
bdrv_delete(s->qcow);
|
||
free(s->qcow_filename);
|
||
}
|
||
|
||
static BlockDriver vvfat_write_target = {
|
||
"vvfat_write_target", 0, NULL, NULL, NULL,
|
||
write_target_commit,
|
||
write_target_close,
|
||
NULL, NULL, NULL
|
||
};
|
||
|
||
static int enable_write_target(BDRVVVFATState *s)
|
||
{
|
||
int size = sector2cluster(s, s->sector_count);
|
||
s->used_clusters = calloc(size, 1);
|
||
|
||
array_init(&(s->commits), sizeof(commit_t));
|
||
|
||
s->qcow_filename = malloc(1024);
|
||
get_tmp_filename(s->qcow_filename, 1024);
|
||
if (bdrv_create(&bdrv_qcow,
|
||
s->qcow_filename, s->sector_count, "fat:", 0) < 0)
|
||
return -1;
|
||
s->qcow = bdrv_new("");
|
||
if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0)
|
||
return -1;
|
||
|
||
#ifndef _WIN32
|
||
unlink(s->qcow_filename);
|
||
#endif
|
||
|
||
s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1);
|
||
s->bs->backing_hd->drv = &vvfat_write_target;
|
||
s->bs->backing_hd->opaque = s;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void vvfat_close(BlockDriverState *bs)
|
||
{
|
||
BDRVVVFATState *s = bs->opaque;
|
||
|
||
vvfat_close_current_file(s);
|
||
array_free(&(s->fat));
|
||
array_free(&(s->directory));
|
||
array_free(&(s->mapping));
|
||
if(s->cluster_buffer)
|
||
free(s->cluster_buffer);
|
||
}
|
||
|
||
BlockDriver bdrv_vvfat = {
|
||
"vvfat",
|
||
sizeof(BDRVVVFATState),
|
||
NULL, /* no probe for protocols */
|
||
vvfat_open,
|
||
vvfat_read,
|
||
vvfat_write,
|
||
vvfat_close,
|
||
NULL, /* ??? Not sure if we can do any meaningful flushing. */
|
||
NULL,
|
||
vvfat_is_allocated,
|
||
.protocol_name = "fat",
|
||
};
|
||
|
||
#ifdef DEBUG
|
||
static void checkpoint(void) {
|
||
assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
|
||
check1(vvv);
|
||
check2(vvv);
|
||
assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
|
||
#if 0
|
||
if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
|
||
fprintf(stderr, "Nonono!\n");
|
||
mapping_t* mapping;
|
||
direntry_t* direntry;
|
||
assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
|
||
assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
|
||
if (vvv->mapping.next<47)
|
||
return;
|
||
assert((mapping = array_get(&(vvv->mapping), 47)));
|
||
assert(mapping->dir_index < vvv->directory.next);
|
||
direntry = array_get(&(vvv->directory), mapping->dir_index);
|
||
assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
|
||
#endif
|
||
return;
|
||
/* avoid compiler warnings: */
|
||
hexdump(NULL, 100);
|
||
remove_mapping(vvv, NULL);
|
||
print_mapping(NULL);
|
||
print_direntry(NULL);
|
||
}
|
||
#endif
|
||
|