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/* vim:set shiftwidth=4 ts=4: */
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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 "qemu-common.h" |
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#include "block/block_int.h" |
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#include "qemu/module.h" |
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#include "migration/migration.h" |
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#include "qapi/qmp/qint.h" |
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#include "qapi/qmp/qbool.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 = NULL;
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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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g_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 < 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 = g_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=g_realloc(array->pointer,array->size+increment); |
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if(!array->pointer)
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return NULL; |
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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=g_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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g_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 % 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 QEMU_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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} QEMU_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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} QEMU_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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} QEMU_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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} QEMU_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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} QEMU_PACKED mbr_t; |
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typedef struct direntry_t { |
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uint8_t name[8 + 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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} QEMU_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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CoMutex lock; |
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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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Error *migration_blocker; |
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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(mbr_chs_t *chs, int spos, int cyls, int heads, int secs) |
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{ |
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int head,sector;
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sector = spos % secs; spos /= secs; |
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head = spos % heads; spos /= heads; |
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if (spos >= 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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|
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static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs) |
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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(&partition->start_CHS, s->first_sectors_number - 1,
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cyls, heads, secs); |
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lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
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cyls, heads, secs); |
402 |
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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->bs->total_sectors |
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- s->first_sectors_number + 1);
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|
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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); |
414 |
|
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real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; |
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} |
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|
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/* direntry functions */
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|
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/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
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static inline int short2long_name(char* dest,const char* src) |
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{ |
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int i;
|
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int len;
|
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for(i=0;i<129 && src[i];i++) { |
426 |
dest[2*i]=src[i];
|
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dest[2*i+1]=0; |
428 |
} |
429 |
len=2*i;
|
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dest[2*i]=dest[2*i+1]=0; |
431 |
for(i=2*i+2;(i%26);i++) |
432 |
dest[i]=0xff;
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return len;
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} |
435 |
|
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static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
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{ |
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char buffer[258]; |
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int length=short2long_name(buffer,filename),
|
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number_of_entries=(length+25)/26,i; |
441 |
direntry_t* entry; |
442 |
|
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for(i=0;i<number_of_entries;i++) { |
444 |
entry=array_get_next(&(s->directory)); |
445 |
entry->attributes=0xf;
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entry->reserved[0]=0; |
447 |
entry->begin=0;
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entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); |
449 |
} |
450 |
for(i=0;i<26*number_of_entries;i++) { |
451 |
int offset=(i%26); |
452 |
if(offset<10) offset=1+offset; |
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else if(offset<22) offset=14+offset-10; |
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else offset=28+offset-22; |
455 |
entry=array_get(&(s->directory),s->directory.next-1-(i/26)); |
456 |
entry->name[offset]=buffer[i]; |
457 |
} |
458 |
return array_get(&(s->directory),s->directory.next-number_of_entries);
|
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} |
460 |
|
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static char is_free(const direntry_t* direntry) |
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{ |
463 |
return direntry->name[0]==0xe5 || direntry->name[0]==0x00; |
464 |
} |
465 |
|
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static char is_volume_label(const direntry_t* direntry) |
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{ |
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return direntry->attributes == 0x28; |
469 |
} |
470 |
|
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static char is_long_name(const direntry_t* direntry) |
472 |
{ |
473 |
return direntry->attributes == 0xf; |
474 |
} |
475 |
|
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static char is_short_name(const direntry_t* direntry) |
477 |
{ |
478 |
return !is_volume_label(direntry) && !is_long_name(direntry)
|
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&& !is_free(direntry); |
480 |
} |
481 |
|
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static char is_directory(const direntry_t* direntry) |
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{ |
484 |
return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; |
485 |
} |
486 |
|
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static inline char is_dot(const direntry_t* direntry) |
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{ |
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return is_short_name(direntry) && direntry->name[0] == '.'; |
490 |
} |
491 |
|
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static char is_file(const direntry_t* direntry) |
493 |
{ |
494 |
return is_short_name(direntry) && !is_directory(direntry);
|
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} |
496 |
|
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static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
498 |
{ |
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return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); |
500 |
} |
501 |
|
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static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
503 |
{ |
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return le32_to_cpu(direntry->size);
|
505 |
} |
506 |
|
507 |
static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
508 |
{ |
509 |
direntry->begin = cpu_to_le16(begin & 0xffff);
|
510 |
direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); |
511 |
} |
512 |
|
513 |
/* fat functions */
|
514 |
|
515 |
static inline uint8_t fat_chksum(const direntry_t* entry) |
516 |
{ |
517 |
uint8_t chksum=0;
|
518 |
int i;
|
519 |
|
520 |
for (i = 0; i < ARRAY_SIZE(entry->name); i++) { |
521 |
chksum = (((chksum & 0xfe) >> 1) | |
522 |
((chksum & 0x01) ? 0x80 : 0)) + entry->name[i]; |
523 |
} |
524 |
|
525 |
return chksum;
|
526 |
} |
527 |
|
528 |
/* if return_time==0, this returns the fat_date, else the fat_time */
|
529 |
static uint16_t fat_datetime(time_t time,int return_time) { |
530 |
struct tm* t;
|
531 |
struct tm t1;
|
532 |
t = &t1; |
533 |
localtime_r(&time,t); |
534 |
if(return_time)
|
535 |
return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); |
536 |
return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); |
537 |
} |
538 |
|
539 |
static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) |
540 |
{ |
541 |
if(s->fat_type==32) { |
542 |
uint32_t* entry=array_get(&(s->fat),cluster); |
543 |
*entry=cpu_to_le32(value); |
544 |
} else if(s->fat_type==16) { |
545 |
uint16_t* entry=array_get(&(s->fat),cluster); |
546 |
*entry=cpu_to_le16(value&0xffff);
|
547 |
} else {
|
548 |
int offset = (cluster*3/2); |
549 |
unsigned char* p = array_get(&(s->fat), offset); |
550 |
switch (cluster&1) { |
551 |
case 0: |
552 |
p[0] = value&0xff; |
553 |
p[1] = (p[1]&0xf0) | ((value>>8)&0xf); |
554 |
break;
|
555 |
case 1: |
556 |
p[0] = (p[0]&0xf) | ((value&0xf)<<4); |
557 |
p[1] = (value>>4); |
558 |
break;
|
559 |
} |
560 |
} |
561 |
} |
562 |
|
563 |
static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) |
564 |
{ |
565 |
if(s->fat_type==32) { |
566 |
uint32_t* entry=array_get(&(s->fat),cluster); |
567 |
return le32_to_cpu(*entry);
|
568 |
} else if(s->fat_type==16) { |
569 |
uint16_t* entry=array_get(&(s->fat),cluster); |
570 |
return le16_to_cpu(*entry);
|
571 |
} else {
|
572 |
const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2; |
573 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
574 |
} |
575 |
} |
576 |
|
577 |
static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) |
578 |
{ |
579 |
if(fat_entry>s->max_fat_value-8) |
580 |
return -1; |
581 |
return 0; |
582 |
} |
583 |
|
584 |
static inline void init_fat(BDRVVVFATState* s) |
585 |
{ |
586 |
if (s->fat_type == 12) { |
587 |
array_init(&(s->fat),1);
|
588 |
array_ensure_allocated(&(s->fat), |
589 |
s->sectors_per_fat * 0x200 * 3 / 2 - 1); |
590 |
} else {
|
591 |
array_init(&(s->fat),(s->fat_type==32?4:2)); |
592 |
array_ensure_allocated(&(s->fat), |
593 |
s->sectors_per_fat * 0x200 / s->fat.item_size - 1); |
594 |
} |
595 |
memset(s->fat.pointer,0,s->fat.size);
|
596 |
|
597 |
switch(s->fat_type) {
|
598 |
case 12: s->max_fat_value=0xfff; break; |
599 |
case 16: s->max_fat_value=0xffff; break; |
600 |
case 32: s->max_fat_value=0x0fffffff; break; |
601 |
default: s->max_fat_value=0; /* error... */ |
602 |
} |
603 |
|
604 |
} |
605 |
|
606 |
/* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
|
607 |
/* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
|
608 |
static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
609 |
unsigned int directory_start, const char* filename, int is_dot) |
610 |
{ |
611 |
int i,j,long_index=s->directory.next;
|
612 |
direntry_t* entry = NULL;
|
613 |
direntry_t* entry_long = NULL;
|
614 |
|
615 |
if(is_dot) {
|
616 |
entry=array_get_next(&(s->directory)); |
617 |
memset(entry->name, 0x20, sizeof(entry->name)); |
618 |
memcpy(entry->name,filename,strlen(filename)); |
619 |
return entry;
|
620 |
} |
621 |
|
622 |
entry_long=create_long_filename(s,filename); |
623 |
|
624 |
i = strlen(filename); |
625 |
for(j = i - 1; j>0 && filename[j]!='.';j--); |
626 |
if (j > 0) |
627 |
i = (j > 8 ? 8 : j); |
628 |
else if (i > 8) |
629 |
i = 8;
|
630 |
|
631 |
entry=array_get_next(&(s->directory)); |
632 |
memset(entry->name, 0x20, sizeof(entry->name)); |
633 |
memcpy(entry->name, filename, i); |
634 |
|
635 |
if (j > 0) { |
636 |
for (i = 0; i < 3 && filename[j + 1 + i]; i++) { |
637 |
entry->name[8 + i] = filename[j + 1 + i]; |
638 |
} |
639 |
} |
640 |
|
641 |
/* upcase & remove unwanted characters */
|
642 |
for(i=10;i>=0;i--) { |
643 |
if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
644 |
if(entry->name[i]<=' ' || entry->name[i]>0x7f |
645 |
|| strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
|
646 |
entry->name[i]='_';
|
647 |
else if(entry->name[i]>='a' && entry->name[i]<='z') |
648 |
entry->name[i]+='A'-'a'; |
649 |
} |
650 |
|
651 |
/* mangle duplicates */
|
652 |
while(1) { |
653 |
direntry_t* entry1=array_get(&(s->directory),directory_start); |
654 |
int j;
|
655 |
|
656 |
for(;entry1<entry;entry1++)
|
657 |
if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
658 |
break; /* found dupe */ |
659 |
if(entry1==entry) /* no dupe found */ |
660 |
break;
|
661 |
|
662 |
/* use all 8 characters of name */
|
663 |
if(entry->name[7]==' ') { |
664 |
int j;
|
665 |
for(j=6;j>0 && entry->name[j]==' ';j--) |
666 |
entry->name[j]='~';
|
667 |
} |
668 |
|
669 |
/* increment number */
|
670 |
for(j=7;j>0 && entry->name[j]=='9';j--) |
671 |
entry->name[j]='0';
|
672 |
if(j>0) { |
673 |
if(entry->name[j]<'0' || entry->name[j]>'9') |
674 |
entry->name[j]='0';
|
675 |
else
|
676 |
entry->name[j]++; |
677 |
} |
678 |
} |
679 |
|
680 |
/* calculate checksum; propagate to long name */
|
681 |
if(entry_long) {
|
682 |
uint8_t chksum=fat_chksum(entry); |
683 |
|
684 |
/* calculate anew, because realloc could have taken place */
|
685 |
entry_long=array_get(&(s->directory),long_index); |
686 |
while(entry_long<entry && is_long_name(entry_long)) {
|
687 |
entry_long->reserved[1]=chksum;
|
688 |
entry_long++; |
689 |
} |
690 |
} |
691 |
|
692 |
return entry;
|
693 |
} |
694 |
|
695 |
/*
|
696 |
* Read a directory. (the index of the corresponding mapping must be passed).
|
697 |
*/
|
698 |
static int read_directory(BDRVVVFATState* s, int mapping_index) |
699 |
{ |
700 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
701 |
direntry_t* direntry; |
702 |
const char* dirname = mapping->path; |
703 |
int first_cluster = mapping->begin;
|
704 |
int parent_index = mapping->info.dir.parent_mapping_index;
|
705 |
mapping_t* parent_mapping = (mapping_t*) |
706 |
(parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL); |
707 |
int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
708 |
|
709 |
DIR* dir=opendir(dirname); |
710 |
struct dirent* entry;
|
711 |
int i;
|
712 |
|
713 |
assert(mapping->mode & MODE_DIRECTORY); |
714 |
|
715 |
if(!dir) {
|
716 |
mapping->end = mapping->begin; |
717 |
return -1; |
718 |
} |
719 |
|
720 |
i = mapping->info.dir.first_dir_index = |
721 |
first_cluster == 0 ? 0 : s->directory.next; |
722 |
|
723 |
/* actually read the directory, and allocate the mappings */
|
724 |
while((entry=readdir(dir))) {
|
725 |
unsigned int length=strlen(dirname)+2+strlen(entry->d_name); |
726 |
char* buffer;
|
727 |
direntry_t* direntry; |
728 |
struct stat st;
|
729 |
int is_dot=!strcmp(entry->d_name,"."); |
730 |
int is_dotdot=!strcmp(entry->d_name,".."); |
731 |
|
732 |
if(first_cluster == 0 && (is_dotdot || is_dot)) |
733 |
continue;
|
734 |
|
735 |
buffer=(char*)g_malloc(length);
|
736 |
snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
737 |
|
738 |
if(stat(buffer,&st)<0) { |
739 |
g_free(buffer); |
740 |
continue;
|
741 |
} |
742 |
|
743 |
/* create directory entry for this file */
|
744 |
direntry=create_short_and_long_name(s, i, entry->d_name, |
745 |
is_dot || is_dotdot); |
746 |
direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
747 |
direntry->reserved[0]=direntry->reserved[1]=0; |
748 |
direntry->ctime=fat_datetime(st.st_ctime,1);
|
749 |
direntry->cdate=fat_datetime(st.st_ctime,0);
|
750 |
direntry->adate=fat_datetime(st.st_atime,0);
|
751 |
direntry->begin_hi=0;
|
752 |
direntry->mtime=fat_datetime(st.st_mtime,1);
|
753 |
direntry->mdate=fat_datetime(st.st_mtime,0);
|
754 |
if(is_dotdot)
|
755 |
set_begin_of_direntry(direntry, first_cluster_of_parent); |
756 |
else if(is_dot) |
757 |
set_begin_of_direntry(direntry, first_cluster); |
758 |
else
|
759 |
direntry->begin=0; /* do that later */ |
760 |
if (st.st_size > 0x7fffffff) { |
761 |
fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
762 |
g_free(buffer); |
763 |
closedir(dir); |
764 |
return -2; |
765 |
} |
766 |
direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
767 |
|
768 |
/* create mapping for this file */
|
769 |
if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
770 |
s->current_mapping=(mapping_t*)array_get_next(&(s->mapping)); |
771 |
s->current_mapping->begin=0;
|
772 |
s->current_mapping->end=st.st_size; |
773 |
/*
|
774 |
* we get the direntry of the most recent direntry, which
|
775 |
* contains the short name and all the relevant information.
|
776 |
*/
|
777 |
s->current_mapping->dir_index=s->directory.next-1;
|
778 |
s->current_mapping->first_mapping_index = -1;
|
779 |
if (S_ISDIR(st.st_mode)) {
|
780 |
s->current_mapping->mode = MODE_DIRECTORY; |
781 |
s->current_mapping->info.dir.parent_mapping_index = |
782 |
mapping_index; |
783 |
} else {
|
784 |
s->current_mapping->mode = MODE_UNDEFINED; |
785 |
s->current_mapping->info.file.offset = 0;
|
786 |
} |
787 |
s->current_mapping->path=buffer; |
788 |
s->current_mapping->read_only = |
789 |
(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
790 |
} |
791 |
} |
792 |
closedir(dir); |
793 |
|
794 |
/* fill with zeroes up to the end of the cluster */
|
795 |
while(s->directory.next%(0x10*s->sectors_per_cluster)) { |
796 |
direntry_t* direntry=array_get_next(&(s->directory)); |
797 |
memset(direntry,0,sizeof(direntry_t)); |
798 |
} |
799 |
|
800 |
/* TODO: if there are more entries, bootsector has to be adjusted! */
|
801 |
#define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) |
802 |
if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { |
803 |
/* root directory */
|
804 |
int cur = s->directory.next;
|
805 |
array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
|
806 |
s->directory.next = ROOT_ENTRIES; |
807 |
memset(array_get(&(s->directory), cur), 0,
|
808 |
(ROOT_ENTRIES - cur) * sizeof(direntry_t));
|
809 |
} |
810 |
|
811 |
/* reget the mapping, since s->mapping was possibly realloc()ed */
|
812 |
mapping = (mapping_t*)array_get(&(s->mapping), mapping_index); |
813 |
first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
814 |
* 0x20 / s->cluster_size;
|
815 |
mapping->end = first_cluster; |
816 |
|
817 |
direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index); |
818 |
set_begin_of_direntry(direntry, mapping->begin); |
819 |
|
820 |
return 0; |
821 |
} |
822 |
|
823 |
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
824 |
{ |
825 |
return (sector_num-s->faked_sectors)/s->sectors_per_cluster;
|
826 |
} |
827 |
|
828 |
static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
829 |
{ |
830 |
return s->faked_sectors + s->sectors_per_cluster * cluster_num;
|
831 |
} |
832 |
|
833 |
static int init_directories(BDRVVVFATState* s, |
834 |
const char *dirname, int heads, int secs) |
835 |
{ |
836 |
bootsector_t* bootsector; |
837 |
mapping_t* mapping; |
838 |
unsigned int i; |
839 |
unsigned int cluster; |
840 |
|
841 |
memset(&(s->first_sectors[0]),0,0x40*0x200); |
842 |
|
843 |
s->cluster_size=s->sectors_per_cluster*0x200;
|
844 |
s->cluster_buffer=g_malloc(s->cluster_size); |
845 |
|
846 |
/*
|
847 |
* The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
848 |
* where sc is sector_count,
|
849 |
* spf is sectors_per_fat,
|
850 |
* spc is sectors_per_clusters, and
|
851 |
* fat_type = 12, 16 or 32.
|
852 |
*/
|
853 |
i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; |
854 |
s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
855 |
|
856 |
array_init(&(s->mapping),sizeof(mapping_t));
|
857 |
array_init(&(s->directory),sizeof(direntry_t));
|
858 |
|
859 |
/* add volume label */
|
860 |
{ |
861 |
direntry_t* entry=array_get_next(&(s->directory)); |
862 |
entry->attributes=0x28; /* archive | volume label */ |
863 |
memcpy(entry->name, "QEMU VVFAT ", sizeof(entry->name)); |
864 |
} |
865 |
|
866 |
/* Now build FAT, and write back information into directory */
|
867 |
init_fat(s); |
868 |
|
869 |
s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
|
870 |
s->cluster_count=sector2cluster(s, s->sector_count); |
871 |
|
872 |
mapping = array_get_next(&(s->mapping)); |
873 |
mapping->begin = 0;
|
874 |
mapping->dir_index = 0;
|
875 |
mapping->info.dir.parent_mapping_index = -1;
|
876 |
mapping->first_mapping_index = -1;
|
877 |
mapping->path = g_strdup(dirname); |
878 |
i = strlen(mapping->path); |
879 |
if (i > 0 && mapping->path[i - 1] == '/') |
880 |
mapping->path[i - 1] = '\0'; |
881 |
mapping->mode = MODE_DIRECTORY; |
882 |
mapping->read_only = 0;
|
883 |
s->path = mapping->path; |
884 |
|
885 |
for (i = 0, cluster = 0; i < s->mapping.next; i++) { |
886 |
/* MS-DOS expects the FAT to be 0 for the root directory
|
887 |
* (except for the media byte). */
|
888 |
/* LATER TODO: still true for FAT32? */
|
889 |
int fix_fat = (i != 0); |
890 |
mapping = array_get(&(s->mapping), i); |
891 |
|
892 |
if (mapping->mode & MODE_DIRECTORY) {
|
893 |
mapping->begin = cluster; |
894 |
if(read_directory(s, i)) {
|
895 |
fprintf(stderr, "Could not read directory %s\n",
|
896 |
mapping->path); |
897 |
return -1; |
898 |
} |
899 |
mapping = array_get(&(s->mapping), i); |
900 |
} else {
|
901 |
assert(mapping->mode == MODE_UNDEFINED); |
902 |
mapping->mode=MODE_NORMAL; |
903 |
mapping->begin = cluster; |
904 |
if (mapping->end > 0) { |
905 |
direntry_t* direntry = array_get(&(s->directory), |
906 |
mapping->dir_index); |
907 |
|
908 |
mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; |
909 |
set_begin_of_direntry(direntry, mapping->begin); |
910 |
} else {
|
911 |
mapping->end = cluster + 1;
|
912 |
fix_fat = 0;
|
913 |
} |
914 |
} |
915 |
|
916 |
assert(mapping->begin < mapping->end); |
917 |
|
918 |
/* next free cluster */
|
919 |
cluster = mapping->end; |
920 |
|
921 |
if(cluster > s->cluster_count) {
|
922 |
fprintf(stderr,"Directory does not fit in FAT%d (capacity %.2f MB)\n",
|
923 |
s->fat_type, s->sector_count / 2000.0); |
924 |
return -EINVAL;
|
925 |
} |
926 |
|
927 |
/* fix fat for entry */
|
928 |
if (fix_fat) {
|
929 |
int j;
|
930 |
for(j = mapping->begin; j < mapping->end - 1; j++) |
931 |
fat_set(s, j, j+1);
|
932 |
fat_set(s, mapping->end - 1, s->max_fat_value);
|
933 |
} |
934 |
} |
935 |
|
936 |
mapping = array_get(&(s->mapping), 0);
|
937 |
s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; |
938 |
s->last_cluster_of_root_directory = mapping->end; |
939 |
|
940 |
/* the FAT signature */
|
941 |
fat_set(s,0,s->max_fat_value);
|
942 |
fat_set(s,1,s->max_fat_value);
|
943 |
|
944 |
s->current_mapping = NULL;
|
945 |
|
946 |
bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
947 |
bootsector->jump[0]=0xeb; |
948 |
bootsector->jump[1]=0x3e; |
949 |
bootsector->jump[2]=0x90; |
950 |
memcpy(bootsector->name,"QEMU ",8); |
951 |
bootsector->sector_size=cpu_to_le16(0x200);
|
952 |
bootsector->sectors_per_cluster=s->sectors_per_cluster; |
953 |
bootsector->reserved_sectors=cpu_to_le16(1);
|
954 |
bootsector->number_of_fats=0x2; /* number of FATs */ |
955 |
bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
|
956 |
bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
957 |
bootsector->media_type=(s->first_sectors_number>1?0xf8:0xf0); /* media descriptor (f8=hd, f0=3.5 fd)*/ |
958 |
s->fat.pointer[0] = bootsector->media_type;
|
959 |
bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
960 |
bootsector->sectors_per_track = cpu_to_le16(secs); |
961 |
bootsector->number_of_heads = cpu_to_le16(heads); |
962 |
bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
963 |
bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
964 |
|
965 |
/* LATER TODO: if FAT32, this is wrong */
|
966 |
bootsector->u.fat16.drive_number=s->first_sectors_number==1?0:0x80; /* fda=0, hda=0x80 */ |
967 |
bootsector->u.fat16.current_head=0;
|
968 |
bootsector->u.fat16.signature=0x29;
|
969 |
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
970 |
|
971 |
memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11); |
972 |
memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
973 |
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; |
974 |
|
975 |
return 0; |
976 |
} |
977 |
|
978 |
#ifdef DEBUG
|
979 |
static BDRVVVFATState *vvv = NULL; |
980 |
#endif
|
981 |
|
982 |
static int enable_write_target(BDRVVVFATState *s); |
983 |
static int is_consistent(BDRVVVFATState *s); |
984 |
|
985 |
static void vvfat_rebind(BlockDriverState *bs) |
986 |
{ |
987 |
BDRVVVFATState *s = bs->opaque; |
988 |
s->bs = bs; |
989 |
} |
990 |
|
991 |
static QemuOptsList runtime_opts = {
|
992 |
.name = "vvfat",
|
993 |
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
994 |
.desc = { |
995 |
{ |
996 |
.name = "dir",
|
997 |
.type = QEMU_OPT_STRING, |
998 |
.help = "Host directory to map to the vvfat device",
|
999 |
}, |
1000 |
{ |
1001 |
.name = "fat-type",
|
1002 |
.type = QEMU_OPT_NUMBER, |
1003 |
.help = "FAT type (12, 16 or 32)",
|
1004 |
}, |
1005 |
{ |
1006 |
.name = "floppy",
|
1007 |
.type = QEMU_OPT_BOOL, |
1008 |
.help = "Create a floppy rather than a hard disk image",
|
1009 |
}, |
1010 |
{ |
1011 |
.name = "rw",
|
1012 |
.type = QEMU_OPT_BOOL, |
1013 |
.help = "Make the image writable",
|
1014 |
}, |
1015 |
{ /* end of list */ }
|
1016 |
}, |
1017 |
}; |
1018 |
|
1019 |
static void vvfat_parse_filename(const char *filename, QDict *options, |
1020 |
Error **errp) |
1021 |
{ |
1022 |
int fat_type = 0; |
1023 |
bool floppy = false; |
1024 |
bool rw = false; |
1025 |
int i;
|
1026 |
|
1027 |
if (!strstart(filename, "fat:", NULL)) { |
1028 |
error_setg(errp, "File name string must start with 'fat:'");
|
1029 |
return;
|
1030 |
} |
1031 |
|
1032 |
/* Parse options */
|
1033 |
if (strstr(filename, ":32:")) { |
1034 |
fat_type = 32;
|
1035 |
} else if (strstr(filename, ":16:")) { |
1036 |
fat_type = 16;
|
1037 |
} else if (strstr(filename, ":12:")) { |
1038 |
fat_type = 12;
|
1039 |
} |
1040 |
|
1041 |
if (strstr(filename, ":floppy:")) { |
1042 |
floppy = true;
|
1043 |
} |
1044 |
|
1045 |
if (strstr(filename, ":rw:")) { |
1046 |
rw = true;
|
1047 |
} |
1048 |
|
1049 |
/* Get the directory name without options */
|
1050 |
i = strrchr(filename, ':') - filename;
|
1051 |
assert(i >= 3);
|
1052 |
if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) { |
1053 |
/* workaround for DOS drive names */
|
1054 |
filename += i - 1;
|
1055 |
} else {
|
1056 |
filename += i + 1;
|
1057 |
} |
1058 |
|
1059 |
/* Fill in the options QDict */
|
1060 |
qdict_put(options, "dir", qstring_from_str(filename));
|
1061 |
qdict_put(options, "fat-type", qint_from_int(fat_type));
|
1062 |
qdict_put(options, "floppy", qbool_from_int(floppy));
|
1063 |
qdict_put(options, "rw", qbool_from_int(rw));
|
1064 |
} |
1065 |
|
1066 |
static int vvfat_open(BlockDriverState *bs, QDict *options, int flags, |
1067 |
Error **errp) |
1068 |
{ |
1069 |
BDRVVVFATState *s = bs->opaque; |
1070 |
int cyls, heads, secs;
|
1071 |
bool floppy;
|
1072 |
const char *dirname; |
1073 |
QemuOpts *opts; |
1074 |
Error *local_err = NULL;
|
1075 |
int ret;
|
1076 |
|
1077 |
#ifdef DEBUG
|
1078 |
vvv = s; |
1079 |
#endif
|
1080 |
|
1081 |
DLOG(if (stderr == NULL) { |
1082 |
stderr = fopen("vvfat.log", "a"); |
1083 |
setbuf(stderr, NULL);
|
1084 |
}) |
1085 |
|
1086 |
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
1087 |
qemu_opts_absorb_qdict(opts, options, &local_err); |
1088 |
if (local_err) {
|
1089 |
qerror_report_err(local_err); |
1090 |
error_free(local_err); |
1091 |
ret = -EINVAL; |
1092 |
goto fail;
|
1093 |
} |
1094 |
|
1095 |
dirname = qemu_opt_get(opts, "dir");
|
1096 |
if (!dirname) {
|
1097 |
qerror_report(ERROR_CLASS_GENERIC_ERROR, "vvfat block driver requires "
|
1098 |
"a 'dir' option");
|
1099 |
ret = -EINVAL; |
1100 |
goto fail;
|
1101 |
} |
1102 |
|
1103 |
s->fat_type = qemu_opt_get_number(opts, "fat-type", 0); |
1104 |
floppy = qemu_opt_get_bool(opts, "floppy", false); |
1105 |
|
1106 |
if (floppy) {
|
1107 |
/* 1.44MB or 2.88MB floppy. 2.88MB can be FAT12 (default) or FAT16. */
|
1108 |
if (!s->fat_type) {
|
1109 |
s->fat_type = 12;
|
1110 |
secs = 36;
|
1111 |
s->sectors_per_cluster = 2;
|
1112 |
} else {
|
1113 |
secs = s->fat_type == 12 ? 18 : 36; |
1114 |
s->sectors_per_cluster = 1;
|
1115 |
} |
1116 |
s->first_sectors_number = 1;
|
1117 |
cyls = 80;
|
1118 |
heads = 2;
|
1119 |
} else {
|
1120 |
/* 32MB or 504MB disk*/
|
1121 |
if (!s->fat_type) {
|
1122 |
s->fat_type = 16;
|
1123 |
} |
1124 |
cyls = s->fat_type == 12 ? 64 : 1024; |
1125 |
heads = 16;
|
1126 |
secs = 63;
|
1127 |
} |
1128 |
|
1129 |
switch (s->fat_type) {
|
1130 |
case 32: |
1131 |
fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. "
|
1132 |
"You are welcome to do so!\n");
|
1133 |
break;
|
1134 |
case 16: |
1135 |
case 12: |
1136 |
break;
|
1137 |
default:
|
1138 |
qerror_report(ERROR_CLASS_GENERIC_ERROR, "Valid FAT types are only "
|
1139 |
"12, 16 and 32");
|
1140 |
ret = -EINVAL; |
1141 |
goto fail;
|
1142 |
} |
1143 |
|
1144 |
|
1145 |
s->bs = bs; |
1146 |
|
1147 |
/* LATER TODO: if FAT32, adjust */
|
1148 |
s->sectors_per_cluster=0x10;
|
1149 |
|
1150 |
s->current_cluster=0xffffffff;
|
1151 |
|
1152 |
s->first_sectors_number=0x40;
|
1153 |
/* read only is the default for safety */
|
1154 |
bs->read_only = 1;
|
1155 |
s->qcow = s->write_target = NULL;
|
1156 |
s->qcow_filename = NULL;
|
1157 |
s->fat2 = NULL;
|
1158 |
s->downcase_short_names = 1;
|
1159 |
|
1160 |
fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
|
1161 |
dirname, cyls, heads, secs); |
1162 |
|
1163 |
s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1);
|
1164 |
|
1165 |
if (qemu_opt_get_bool(opts, "rw", false)) { |
1166 |
ret = enable_write_target(s); |
1167 |
if (ret < 0) { |
1168 |
goto fail;
|
1169 |
} |
1170 |
bs->read_only = 0;
|
1171 |
} |
1172 |
|
1173 |
bs->total_sectors = cyls * heads * secs; |
1174 |
|
1175 |
if (init_directories(s, dirname, heads, secs)) {
|
1176 |
ret = -EIO; |
1177 |
goto fail;
|
1178 |
} |
1179 |
|
1180 |
s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; |
1181 |
|
1182 |
if (s->first_sectors_number == 0x40) { |
1183 |
init_mbr(s, cyls, heads, secs); |
1184 |
} |
1185 |
|
1186 |
// assert(is_consistent(s));
|
1187 |
qemu_co_mutex_init(&s->lock); |
1188 |
|
1189 |
/* Disable migration when vvfat is used rw */
|
1190 |
if (s->qcow) {
|
1191 |
error_set(&s->migration_blocker, |
1192 |
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
1193 |
"vvfat (rw)", bs->device_name, "live migration"); |
1194 |
migrate_add_blocker(s->migration_blocker); |
1195 |
} |
1196 |
|
1197 |
ret = 0;
|
1198 |
fail:
|
1199 |
qemu_opts_del(opts); |
1200 |
return ret;
|
1201 |
} |
1202 |
|
1203 |
static inline void vvfat_close_current_file(BDRVVVFATState *s) |
1204 |
{ |
1205 |
if(s->current_mapping) {
|
1206 |
s->current_mapping = NULL;
|
1207 |
if (s->current_fd) {
|
1208 |
qemu_close(s->current_fd); |
1209 |
s->current_fd = 0;
|
1210 |
} |
1211 |
} |
1212 |
s->current_cluster = -1;
|
1213 |
} |
1214 |
|
1215 |
/* mappings between index1 and index2-1 are supposed to be ordered
|
1216 |
* return value is the index of the last mapping for which end>cluster_num
|
1217 |
*/
|
1218 |
static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) |
1219 |
{ |
1220 |
while(1) { |
1221 |
int index3;
|
1222 |
mapping_t* mapping; |
1223 |
index3=(index1+index2)/2;
|
1224 |
mapping=array_get(&(s->mapping),index3); |
1225 |
assert(mapping->begin < mapping->end); |
1226 |
if(mapping->begin>=cluster_num) {
|
1227 |
assert(index2!=index3 || index2==0);
|
1228 |
if(index2==index3)
|
1229 |
return index1;
|
1230 |
index2=index3; |
1231 |
} else {
|
1232 |
if(index1==index3)
|
1233 |
return mapping->end<=cluster_num ? index2 : index1;
|
1234 |
index1=index3; |
1235 |
} |
1236 |
assert(index1<=index2); |
1237 |
DLOG(mapping=array_get(&(s->mapping),index1); |
1238 |
assert(mapping->begin<=cluster_num); |
1239 |
assert(index2 >= s->mapping.next || |
1240 |
((mapping = array_get(&(s->mapping),index2)) && |
1241 |
mapping->end>cluster_num))); |
1242 |
} |
1243 |
} |
1244 |
|
1245 |
static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
1246 |
{ |
1247 |
int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); |
1248 |
mapping_t* mapping; |
1249 |
if(index>=s->mapping.next)
|
1250 |
return NULL; |
1251 |
mapping=array_get(&(s->mapping),index); |
1252 |
if(mapping->begin>cluster_num)
|
1253 |
return NULL; |
1254 |
assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
1255 |
return mapping;
|
1256 |
} |
1257 |
|
1258 |
static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
1259 |
{ |
1260 |
if(!mapping)
|
1261 |
return -1; |
1262 |
if(!s->current_mapping ||
|
1263 |
strcmp(s->current_mapping->path,mapping->path)) { |
1264 |
/* open file */
|
1265 |
int fd = qemu_open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
1266 |
if(fd<0) |
1267 |
return -1; |
1268 |
vvfat_close_current_file(s); |
1269 |
s->current_fd = fd; |
1270 |
s->current_mapping = mapping; |
1271 |
} |
1272 |
return 0; |
1273 |
} |
1274 |
|
1275 |
static inline int read_cluster(BDRVVVFATState *s,int cluster_num) |
1276 |
{ |
1277 |
if(s->current_cluster != cluster_num) {
|
1278 |
int result=0; |
1279 |
off_t offset; |
1280 |
assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
1281 |
if(!s->current_mapping
|
1282 |
|| s->current_mapping->begin>cluster_num |
1283 |
|| s->current_mapping->end<=cluster_num) { |
1284 |
/* binary search of mappings for file */
|
1285 |
mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
1286 |
|
1287 |
assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); |
1288 |
|
1289 |
if (mapping && mapping->mode & MODE_DIRECTORY) {
|
1290 |
vvfat_close_current_file(s); |
1291 |
s->current_mapping = mapping; |
1292 |
read_cluster_directory:
|
1293 |
offset = s->cluster_size*(cluster_num-s->current_mapping->begin); |
1294 |
s->cluster = (unsigned char*)s->directory.pointer+offset |
1295 |
+ 0x20*s->current_mapping->info.dir.first_dir_index;
|
1296 |
assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); |
1297 |
assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
1298 |
s->current_cluster = cluster_num; |
1299 |
return 0; |
1300 |
} |
1301 |
|
1302 |
if(open_file(s,mapping))
|
1303 |
return -2; |
1304 |
} else if (s->current_mapping->mode & MODE_DIRECTORY) |
1305 |
goto read_cluster_directory;
|
1306 |
|
1307 |
assert(s->current_fd); |
1308 |
|
1309 |
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; |
1310 |
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
1311 |
return -3; |
1312 |
s->cluster=s->cluster_buffer; |
1313 |
result=read(s->current_fd,s->cluster,s->cluster_size); |
1314 |
if(result<0) { |
1315 |
s->current_cluster = -1;
|
1316 |
return -1; |
1317 |
} |
1318 |
s->current_cluster = cluster_num; |
1319 |
} |
1320 |
return 0; |
1321 |
} |
1322 |
|
1323 |
#ifdef DEBUG
|
1324 |
static void print_direntry(const direntry_t* direntry) |
1325 |
{ |
1326 |
int j = 0; |
1327 |
char buffer[1024]; |
1328 |
|
1329 |
fprintf(stderr, "direntry %p: ", direntry);
|
1330 |
if(!direntry)
|
1331 |
return;
|
1332 |
if(is_long_name(direntry)) {
|
1333 |
unsigned char* c=(unsigned char*)direntry; |
1334 |
int i;
|
1335 |
for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) |
1336 |
#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;} |
1337 |
ADD_CHAR(c[i]); |
1338 |
for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
1339 |
ADD_CHAR(c[i]); |
1340 |
for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
1341 |
ADD_CHAR(c[i]); |
1342 |
buffer[j] = 0;
|
1343 |
fprintf(stderr, "%s\n", buffer);
|
1344 |
} else {
|
1345 |
int i;
|
1346 |
for(i=0;i<11;i++) |
1347 |
ADD_CHAR(direntry->name[i]); |
1348 |
buffer[j] = 0;
|
1349 |
fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
1350 |
buffer, |
1351 |
direntry->attributes, |
1352 |
begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
1353 |
} |
1354 |
} |
1355 |
|
1356 |
static void print_mapping(const mapping_t* mapping) |
1357 |
{ |
1358 |
fprintf(stderr, "mapping (%p): begin, end = %d, %d, dir_index = %d, "
|
1359 |
"first_mapping_index = %d, name = %s, mode = 0x%x, " ,
|
1360 |
mapping, mapping->begin, mapping->end, mapping->dir_index, |
1361 |
mapping->first_mapping_index, mapping->path, mapping->mode); |
1362 |
|
1363 |
if (mapping->mode & MODE_DIRECTORY)
|
1364 |
fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
1365 |
else
|
1366 |
fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
1367 |
} |
1368 |
#endif
|
1369 |
|
1370 |
static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
1371 |
uint8_t *buf, int nb_sectors)
|
1372 |
{ |
1373 |
BDRVVVFATState *s = bs->opaque; |
1374 |
int i;
|
1375 |
|
1376 |
for(i=0;i<nb_sectors;i++,sector_num++) { |
1377 |
if (sector_num >= bs->total_sectors)
|
1378 |
return -1; |
1379 |
if (s->qcow) {
|
1380 |
int n;
|
1381 |
if (bdrv_is_allocated(s->qcow, sector_num, nb_sectors-i, &n)) {
|
1382 |
DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
1383 |
if (bdrv_read(s->qcow, sector_num, buf + i*0x200, n)) { |
1384 |
return -1; |
1385 |
} |
1386 |
i += n - 1;
|
1387 |
sector_num += n - 1;
|
1388 |
continue;
|
1389 |
} |
1390 |
DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
1391 |
} |
1392 |
if(sector_num<s->faked_sectors) {
|
1393 |
if(sector_num<s->first_sectors_number)
|
1394 |
memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); |
1395 |
else if(sector_num-s->first_sectors_number<s->sectors_per_fat) |
1396 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); |
1397 |
else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) |
1398 |
memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); |
1399 |
} else {
|
1400 |
uint32_t sector=sector_num-s->faked_sectors, |
1401 |
sector_offset_in_cluster=(sector%s->sectors_per_cluster), |
1402 |
cluster_num=sector/s->sectors_per_cluster; |
1403 |
if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) { |
1404 |
/* LATER TODO: strict: return -1; */
|
1405 |
memset(buf+i*0x200,0,0x200); |
1406 |
continue;
|
1407 |
} |
1408 |
memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
1409 |
} |
1410 |
} |
1411 |
return 0; |
1412 |
} |
1413 |
|
1414 |
static coroutine_fn int vvfat_co_read(BlockDriverState *bs, int64_t sector_num, |
1415 |
uint8_t *buf, int nb_sectors)
|
1416 |
{ |
1417 |
int ret;
|
1418 |
BDRVVVFATState *s = bs->opaque; |
1419 |
qemu_co_mutex_lock(&s->lock); |
1420 |
ret = vvfat_read(bs, sector_num, buf, nb_sectors); |
1421 |
qemu_co_mutex_unlock(&s->lock); |
1422 |
return ret;
|
1423 |
} |
1424 |
|
1425 |
/* LATER TODO: statify all functions */
|
1426 |
|
1427 |
/*
|
1428 |
* Idea of the write support (use snapshot):
|
1429 |
*
|
1430 |
* 1. check if all data is consistent, recording renames, modifications,
|
1431 |
* new files and directories (in s->commits).
|
1432 |
*
|
1433 |
* 2. if the data is not consistent, stop committing
|
1434 |
*
|
1435 |
* 3. handle renames, and create new files and directories (do not yet
|
1436 |
* write their contents)
|
1437 |
*
|
1438 |
* 4. walk the directories, fixing the mapping and direntries, and marking
|
1439 |
* the handled mappings as not deleted
|
1440 |
*
|
1441 |
* 5. commit the contents of the files
|
1442 |
*
|
1443 |
* 6. handle deleted files and directories
|
1444 |
*
|
1445 |
*/
|
1446 |
|
1447 |
typedef struct commit_t { |
1448 |
char* path;
|
1449 |
union {
|
1450 |
struct { uint32_t cluster; } rename;
|
1451 |
struct { int dir_index; uint32_t modified_offset; } writeout; |
1452 |
struct { uint32_t first_cluster; } new_file;
|
1453 |
struct { uint32_t cluster; } mkdir;
|
1454 |
} param; |
1455 |
/* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
1456 |
enum {
|
1457 |
ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR |
1458 |
} action; |
1459 |
} commit_t; |
1460 |
|
1461 |
static void clear_commits(BDRVVVFATState* s) |
1462 |
{ |
1463 |
int i;
|
1464 |
DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
1465 |
for (i = 0; i < s->commits.next; i++) { |
1466 |
commit_t* commit = array_get(&(s->commits), i); |
1467 |
assert(commit->path || commit->action == ACTION_WRITEOUT); |
1468 |
if (commit->action != ACTION_WRITEOUT) {
|
1469 |
assert(commit->path); |
1470 |
g_free(commit->path); |
1471 |
} else
|
1472 |
assert(commit->path == NULL);
|
1473 |
} |
1474 |
s->commits.next = 0;
|
1475 |
} |
1476 |
|
1477 |
static void schedule_rename(BDRVVVFATState* s, |
1478 |
uint32_t cluster, char* new_path)
|
1479 |
{ |
1480 |
commit_t* commit = array_get_next(&(s->commits)); |
1481 |
commit->path = new_path; |
1482 |
commit->param.rename.cluster = cluster; |
1483 |
commit->action = ACTION_RENAME; |
1484 |
} |
1485 |
|
1486 |
static void schedule_writeout(BDRVVVFATState* s, |
1487 |
int dir_index, uint32_t modified_offset)
|
1488 |
{ |
1489 |
commit_t* commit = array_get_next(&(s->commits)); |
1490 |
commit->path = NULL;
|
1491 |
commit->param.writeout.dir_index = dir_index; |
1492 |
commit->param.writeout.modified_offset = modified_offset; |
1493 |
commit->action = ACTION_WRITEOUT; |
1494 |
} |
1495 |
|
1496 |
static void schedule_new_file(BDRVVVFATState* s, |
1497 |
char* path, uint32_t first_cluster)
|
1498 |
{ |
1499 |
commit_t* commit = array_get_next(&(s->commits)); |
1500 |
commit->path = path; |
1501 |
commit->param.new_file.first_cluster = first_cluster; |
1502 |
commit->action = ACTION_NEW_FILE; |
1503 |
} |
1504 |
|
1505 |
static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) |
1506 |
{ |
1507 |
commit_t* commit = array_get_next(&(s->commits)); |
1508 |
commit->path = path; |
1509 |
commit->param.mkdir.cluster = cluster; |
1510 |
commit->action = ACTION_MKDIR; |
1511 |
} |
1512 |
|
1513 |
typedef struct { |
1514 |
/*
|
1515 |
* Since the sequence number is at most 0x3f, and the filename
|
1516 |
* length is at most 13 times the sequence number, the maximal
|
1517 |
* filename length is 0x3f * 13 bytes.
|
1518 |
*/
|
1519 |
unsigned char name[0x3f * 13 + 1]; |
1520 |
int checksum, len;
|
1521 |
int sequence_number;
|
1522 |
} long_file_name; |
1523 |
|
1524 |
static void lfn_init(long_file_name* lfn) |
1525 |
{ |
1526 |
lfn->sequence_number = lfn->len = 0;
|
1527 |
lfn->checksum = 0x100;
|
1528 |
} |
1529 |
|
1530 |
/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
1531 |
static int parse_long_name(long_file_name* lfn, |
1532 |
const direntry_t* direntry)
|
1533 |
{ |
1534 |
int i, j, offset;
|
1535 |
const unsigned char* pointer = (const unsigned char*)direntry; |
1536 |
|
1537 |
if (!is_long_name(direntry))
|
1538 |
return 1; |
1539 |
|
1540 |
if (pointer[0] & 0x40) { |
1541 |
lfn->sequence_number = pointer[0] & 0x3f; |
1542 |
lfn->checksum = pointer[13];
|
1543 |
lfn->name[0] = 0; |
1544 |
lfn->name[lfn->sequence_number * 13] = 0; |
1545 |
} else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
1546 |
return -1; |
1547 |
else if (pointer[13] != lfn->checksum) |
1548 |
return -2; |
1549 |
else if (pointer[12] || pointer[26] || pointer[27]) |
1550 |
return -3; |
1551 |
|
1552 |
offset = 13 * (lfn->sequence_number - 1); |
1553 |
for (i = 0, j = 1; i < 13; i++, j+=2) { |
1554 |
if (j == 11) |
1555 |
j = 14;
|
1556 |
else if (j == 26) |
1557 |
j = 28;
|
1558 |
|
1559 |
if (pointer[j+1] == 0) |
1560 |
lfn->name[offset + i] = pointer[j]; |
1561 |
else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) |
1562 |
return -4; |
1563 |
else
|
1564 |
lfn->name[offset + i] = 0;
|
1565 |
} |
1566 |
|
1567 |
if (pointer[0] & 0x40) |
1568 |
lfn->len = offset + strlen((char*)lfn->name + offset);
|
1569 |
|
1570 |
return 0; |
1571 |
} |
1572 |
|
1573 |
/* returns 0 if successful, >0 if no short_name, and <0 on error */
|
1574 |
static int parse_short_name(BDRVVVFATState* s, |
1575 |
long_file_name* lfn, direntry_t* direntry) |
1576 |
{ |
1577 |
int i, j;
|
1578 |
|
1579 |
if (!is_short_name(direntry))
|
1580 |
return 1; |
1581 |
|
1582 |
for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); |
1583 |
for (i = 0; i <= j; i++) { |
1584 |
if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) |
1585 |
return -1; |
1586 |
else if (s->downcase_short_names) |
1587 |
lfn->name[i] = qemu_tolower(direntry->name[i]); |
1588 |
else
|
1589 |
lfn->name[i] = direntry->name[i]; |
1590 |
} |
1591 |
|
1592 |
for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) { |
1593 |
} |
1594 |
if (j >= 0) { |
1595 |
lfn->name[i++] = '.';
|
1596 |
lfn->name[i + j + 1] = '\0'; |
1597 |
for (;j >= 0; j--) { |
1598 |
uint8_t c = direntry->name[8 + j];
|
1599 |
if (c <= ' ' || c > 0x7f) { |
1600 |
return -2; |
1601 |
} else if (s->downcase_short_names) { |
1602 |
lfn->name[i + j] = qemu_tolower(c); |
1603 |
} else {
|
1604 |
lfn->name[i + j] = c; |
1605 |
} |
1606 |
} |
1607 |
} else
|
1608 |
lfn->name[i + j + 1] = '\0'; |
1609 |
|
1610 |
lfn->len = strlen((char*)lfn->name);
|
1611 |
|
1612 |
return 0; |
1613 |
} |
1614 |
|
1615 |
static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
1616 |
unsigned int cluster) |
1617 |
{ |
1618 |
if (cluster < s->last_cluster_of_root_directory) {
|
1619 |
if (cluster + 1 == s->last_cluster_of_root_directory) |
1620 |
return s->max_fat_value;
|
1621 |
else
|
1622 |
return cluster + 1; |
1623 |
} |
1624 |
|
1625 |
if (s->fat_type==32) { |
1626 |
uint32_t* entry=((uint32_t*)s->fat2)+cluster; |
1627 |
return le32_to_cpu(*entry);
|
1628 |
} else if (s->fat_type==16) { |
1629 |
uint16_t* entry=((uint16_t*)s->fat2)+cluster; |
1630 |
return le16_to_cpu(*entry);
|
1631 |
} else {
|
1632 |
const uint8_t* x=s->fat2+cluster*3/2; |
1633 |
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
1634 |
} |
1635 |
} |
1636 |
|
1637 |
static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) |
1638 |
{ |
1639 |
int was_modified = 0; |
1640 |
int i, dummy;
|
1641 |
|
1642 |
if (s->qcow == NULL) |
1643 |
return 0; |
1644 |
|
1645 |
for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) |
1646 |
was_modified = bdrv_is_allocated(s->qcow, |
1647 |
cluster2sector(s, cluster_num) + i, 1, &dummy);
|
1648 |
|
1649 |
return was_modified;
|
1650 |
} |
1651 |
|
1652 |
static const char* get_basename(const char* path) |
1653 |
{ |
1654 |
char* basename = strrchr(path, '/'); |
1655 |
if (basename == NULL) |
1656 |
return path;
|
1657 |
else
|
1658 |
return basename + 1; /* strip '/' */ |
1659 |
} |
1660 |
|
1661 |
/*
|
1662 |
* The array s->used_clusters holds the states of the clusters. If it is
|
1663 |
* part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
1664 |
* was modified, bit 3 is set.
|
1665 |
* If any cluster is allocated, but not part of a file or directory, this
|
1666 |
* driver refuses to commit.
|
1667 |
*/
|
1668 |
typedef enum { |
1669 |
USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 |
1670 |
} used_t; |
1671 |
|
1672 |
/*
|
1673 |
* get_cluster_count_for_direntry() not only determines how many clusters
|
1674 |
* are occupied by direntry, but also if it was renamed or modified.
|
1675 |
*
|
1676 |
* A file is thought to be renamed *only* if there already was a file with
|
1677 |
* exactly the same first cluster, but a different name.
|
1678 |
*
|
1679 |
* Further, the files/directories handled by this function are
|
1680 |
* assumed to be *not* deleted (and *only* those).
|
1681 |
*/
|
1682 |
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
1683 |
direntry_t* direntry, const char* path) |
1684 |
{ |
1685 |
/*
|
1686 |
* This is a little bit tricky:
|
1687 |
* IF the guest OS just inserts a cluster into the file chain,
|
1688 |
* and leaves the rest alone, (i.e. the original file had clusters
|
1689 |
* 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
1690 |
*
|
1691 |
* - do_commit will write the cluster into the file at the given
|
1692 |
* offset, but
|
1693 |
*
|
1694 |
* - the cluster which is overwritten should be moved to a later
|
1695 |
* position in the file.
|
1696 |
*
|
1697 |
* I am not aware that any OS does something as braindead, but this
|
1698 |
* situation could happen anyway when not committing for a long time.
|
1699 |
* Just to be sure that this does not bite us, detect it, and copy the
|
1700 |
* contents of the clusters to-be-overwritten into the qcow.
|
1701 |
*/
|
1702 |
int copy_it = 0; |
1703 |
int was_modified = 0; |
1704 |
int32_t ret = 0;
|
1705 |
|
1706 |
uint32_t cluster_num = begin_of_direntry(direntry); |
1707 |
uint32_t offset = 0;
|
1708 |
int first_mapping_index = -1; |
1709 |
mapping_t* mapping = NULL;
|
1710 |
const char* basename2 = NULL; |
1711 |
|
1712 |
vvfat_close_current_file(s); |
1713 |
|
1714 |
/* the root directory */
|
1715 |
if (cluster_num == 0) |
1716 |
return 0; |
1717 |
|
1718 |
/* write support */
|
1719 |
if (s->qcow) {
|
1720 |
basename2 = get_basename(path); |
1721 |
|
1722 |
mapping = find_mapping_for_cluster(s, cluster_num); |
1723 |
|
1724 |
if (mapping) {
|
1725 |
const char* basename; |
1726 |
|
1727 |
assert(mapping->mode & MODE_DELETED); |
1728 |
mapping->mode &= ~MODE_DELETED; |
1729 |
|
1730 |
basename = get_basename(mapping->path); |
1731 |
|
1732 |
assert(mapping->mode & MODE_NORMAL); |
1733 |
|
1734 |
/* rename */
|
1735 |
if (strcmp(basename, basename2))
|
1736 |
schedule_rename(s, cluster_num, g_strdup(path)); |
1737 |
} else if (is_file(direntry)) |
1738 |
/* new file */
|
1739 |
schedule_new_file(s, g_strdup(path), cluster_num); |
1740 |
else {
|
1741 |
abort(); |
1742 |
return 0; |
1743 |
} |
1744 |
} |
1745 |
|
1746 |
while(1) { |
1747 |
if (s->qcow) {
|
1748 |
if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
1749 |
if (mapping == NULL || |
1750 |
mapping->begin > cluster_num || |
1751 |
mapping->end <= cluster_num) |
1752 |
mapping = find_mapping_for_cluster(s, cluster_num); |
1753 |
|
1754 |
|
1755 |
if (mapping &&
|
1756 |
(mapping->mode & MODE_DIRECTORY) == 0) {
|
1757 |
|
1758 |
/* was modified in qcow */
|
1759 |
if (offset != mapping->info.file.offset + s->cluster_size
|
1760 |
* (cluster_num - mapping->begin)) { |
1761 |
/* offset of this cluster in file chain has changed */
|
1762 |
abort(); |
1763 |
copy_it = 1;
|
1764 |
} else if (offset == 0) { |
1765 |
const char* basename = get_basename(mapping->path); |
1766 |
|
1767 |
if (strcmp(basename, basename2))
|
1768 |
copy_it = 1;
|
1769 |
first_mapping_index = array_index(&(s->mapping), mapping); |
1770 |
} |
1771 |
|
1772 |
if (mapping->first_mapping_index != first_mapping_index
|
1773 |
&& mapping->info.file.offset > 0) {
|
1774 |
abort(); |
1775 |
copy_it = 1;
|
1776 |
} |
1777 |
|
1778 |
/* need to write out? */
|
1779 |
if (!was_modified && is_file(direntry)) {
|
1780 |
was_modified = 1;
|
1781 |
schedule_writeout(s, mapping->dir_index, offset); |
1782 |
} |
1783 |
} |
1784 |
} |
1785 |
|
1786 |
if (copy_it) {
|
1787 |
int i, dummy;
|
1788 |
/*
|
1789 |
* This is horribly inefficient, but that is okay, since
|
1790 |
* it is rarely executed, if at all.
|
1791 |
*/
|
1792 |
int64_t offset = cluster2sector(s, cluster_num); |
1793 |
|
1794 |
vvfat_close_current_file(s); |
1795 |
for (i = 0; i < s->sectors_per_cluster; i++) { |
1796 |
if (!bdrv_is_allocated(s->qcow, offset + i, 1, &dummy)) { |
1797 |
if (vvfat_read(s->bs, offset, s->cluster_buffer, 1)) { |
1798 |
return -1; |
1799 |
} |
1800 |
if (bdrv_write(s->qcow, offset, s->cluster_buffer, 1)) { |
1801 |
return -2; |
1802 |
} |
1803 |
} |
1804 |
} |
1805 |
} |
1806 |
} |
1807 |
|
1808 |
ret++; |
1809 |
if (s->used_clusters[cluster_num] & USED_ANY)
|
1810 |
return 0; |
1811 |
s->used_clusters[cluster_num] = USED_FILE; |
1812 |
|
1813 |
cluster_num = modified_fat_get(s, cluster_num); |
1814 |
|
1815 |
if (fat_eof(s, cluster_num))
|
1816 |
return ret;
|
1817 |
else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) |
1818 |
return -1; |
1819 |
|
1820 |
offset += s->cluster_size; |
1821 |
} |
1822 |
} |
1823 |
|
1824 |
/*
|
1825 |
* This function looks at the modified data (qcow).
|
1826 |
* It returns 0 upon inconsistency or error, and the number of clusters
|
1827 |
* used by the directory, its subdirectories and their files.
|
1828 |
*/
|
1829 |
static int check_directory_consistency(BDRVVVFATState *s, |
1830 |
int cluster_num, const char* path) |
1831 |
{ |
1832 |
int ret = 0; |
1833 |
unsigned char* cluster = g_malloc(s->cluster_size); |
1834 |
direntry_t* direntries = (direntry_t*)cluster; |
1835 |
mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); |
1836 |
|
1837 |
long_file_name lfn; |
1838 |
int path_len = strlen(path);
|
1839 |
char path2[PATH_MAX + 1]; |
1840 |
|
1841 |
assert(path_len < PATH_MAX); /* len was tested before! */
|
1842 |
pstrcpy(path2, sizeof(path2), path);
|
1843 |
path2[path_len] = '/';
|
1844 |
path2[path_len + 1] = '\0'; |
1845 |
|
1846 |
if (mapping) {
|
1847 |
const char* basename = get_basename(mapping->path); |
1848 |
const char* basename2 = get_basename(path); |
1849 |
|
1850 |
assert(mapping->mode & MODE_DIRECTORY); |
1851 |
|
1852 |
assert(mapping->mode & MODE_DELETED); |
1853 |
mapping->mode &= ~MODE_DELETED; |
1854 |
|
1855 |
if (strcmp(basename, basename2))
|
1856 |
schedule_rename(s, cluster_num, g_strdup(path)); |
1857 |
} else
|
1858 |
/* new directory */
|
1859 |
schedule_mkdir(s, cluster_num, g_strdup(path)); |
1860 |
|
1861 |
lfn_init(&lfn); |
1862 |
do {
|
1863 |
int i;
|
1864 |
int subret = 0; |
1865 |
|
1866 |
ret++; |
1867 |
|
1868 |
if (s->used_clusters[cluster_num] & USED_ANY) {
|
1869 |
fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); |
1870 |
return 0; |
1871 |
} |
1872 |
s->used_clusters[cluster_num] = USED_DIRECTORY; |
1873 |
|
1874 |
DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); |
1875 |
subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, |
1876 |
s->sectors_per_cluster); |
1877 |
if (subret) {
|
1878 |
fprintf(stderr, "Error fetching direntries\n");
|
1879 |
fail:
|
1880 |
g_free(cluster); |
1881 |
return 0; |
1882 |
} |
1883 |
|
1884 |
for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { |
1885 |
int cluster_count = 0; |
1886 |
|
1887 |
DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
|
1888 |
if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
1889 |
is_free(direntries + i)) |
1890 |
continue;
|
1891 |
|
1892 |
subret = parse_long_name(&lfn, direntries + i); |
1893 |
if (subret < 0) { |
1894 |
fprintf(stderr, "Error in long name\n");
|
1895 |
goto fail;
|
1896 |
} |
1897 |
if (subret == 0 || is_free(direntries + i)) |
1898 |
continue;
|
1899 |
|
1900 |
if (fat_chksum(direntries+i) != lfn.checksum) {
|
1901 |
subret = parse_short_name(s, &lfn, direntries + i); |
1902 |
if (subret < 0) { |
1903 |
fprintf(stderr, "Error in short name (%d)\n", subret);
|
1904 |
goto fail;
|
1905 |
} |
1906 |
if (subret > 0 || !strcmp((char*)lfn.name, ".") |
1907 |
|| !strcmp((char*)lfn.name, "..")) |
1908 |
continue;
|
1909 |
} |
1910 |
lfn.checksum = 0x100; /* cannot use long name twice */ |
1911 |
|
1912 |
if (path_len + 1 + lfn.len >= PATH_MAX) { |
1913 |
fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
1914 |
goto fail;
|
1915 |
} |
1916 |
pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1, |
1917 |
(char*)lfn.name);
|
1918 |
|
1919 |
if (is_directory(direntries + i)) {
|
1920 |
if (begin_of_direntry(direntries + i) == 0) { |
1921 |
DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
1922 |
goto fail;
|
1923 |
} |
1924 |
cluster_count = check_directory_consistency(s, |
1925 |
begin_of_direntry(direntries + i), path2); |
1926 |
if (cluster_count == 0) { |
1927 |
DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
1928 |
goto fail;
|
1929 |
} |
1930 |
} else if (is_file(direntries + i)) { |
1931 |
/* check file size with FAT */
|
1932 |
cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); |
1933 |
if (cluster_count !=
|
1934 |
(le32_to_cpu(direntries[i].size) + s->cluster_size |
1935 |
- 1) / s->cluster_size) {
|
1936 |
DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
1937 |
goto fail;
|
1938 |
} |
1939 |
} else
|
1940 |
abort(); /* cluster_count = 0; */
|
1941 |
|
1942 |
ret += cluster_count; |
1943 |
} |
1944 |
|
1945 |
cluster_num = modified_fat_get(s, cluster_num); |
1946 |
} while(!fat_eof(s, cluster_num));
|
1947 |
|
1948 |
g_free(cluster); |
1949 |
return ret;
|
1950 |
} |
1951 |
|
1952 |
/* returns 1 on success */
|
1953 |
static int is_consistent(BDRVVVFATState* s) |
1954 |
{ |
1955 |
int i, check;
|
1956 |
int used_clusters_count = 0; |
1957 |
|
1958 |
DLOG(checkpoint()); |
1959 |
/*
|
1960 |
* - get modified FAT
|
1961 |
* - compare the two FATs (TODO)
|
1962 |
* - get buffer for marking used clusters
|
1963 |
* - recurse direntries from root (using bs->bdrv_read to make
|
1964 |
* sure to get the new data)
|
1965 |
* - check that the FAT agrees with the size
|
1966 |
* - count the number of clusters occupied by this directory and
|
1967 |
* its files
|
1968 |
* - check that the cumulative used cluster count agrees with the
|
1969 |
* FAT
|
1970 |
* - if all is fine, return number of used clusters
|
1971 |
*/
|
1972 |
if (s->fat2 == NULL) { |
1973 |
int size = 0x200 * s->sectors_per_fat; |
1974 |
s->fat2 = g_malloc(size); |
1975 |
memcpy(s->fat2, s->fat.pointer, size); |
1976 |
} |
1977 |
check = vvfat_read(s->bs, |
1978 |
s->first_sectors_number, s->fat2, s->sectors_per_fat); |
1979 |
if (check) {
|
1980 |
fprintf(stderr, "Could not copy fat\n");
|
1981 |
return 0; |
1982 |
} |
1983 |
assert (s->used_clusters); |
1984 |
for (i = 0; i < sector2cluster(s, s->sector_count); i++) |
1985 |
s->used_clusters[i] &= ~USED_ANY; |
1986 |
|
1987 |
clear_commits(s); |
1988 |
|
1989 |
/* mark every mapped file/directory as deleted.
|
1990 |
* (check_directory_consistency() will unmark those still present). */
|
1991 |
if (s->qcow)
|
1992 |
for (i = 0; i < s->mapping.next; i++) { |
1993 |
mapping_t* mapping = array_get(&(s->mapping), i); |
1994 |
if (mapping->first_mapping_index < 0) |
1995 |
mapping->mode |= MODE_DELETED; |
1996 |
} |
1997 |
|
1998 |
used_clusters_count = check_directory_consistency(s, 0, s->path);
|
1999 |
if (used_clusters_count <= 0) { |
2000 |
DLOG(fprintf(stderr, "problem in directory\n"));
|
2001 |
return 0; |
2002 |
} |
2003 |
|
2004 |
check = s->last_cluster_of_root_directory; |
2005 |
for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
2006 |
if (modified_fat_get(s, i)) {
|
2007 |
if(!s->used_clusters[i]) {
|
2008 |
DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
2009 |
return 0; |
2010 |
} |
2011 |
check++; |
2012 |
} |
2013 |
|
2014 |
if (s->used_clusters[i] == USED_ALLOCATED) {
|
2015 |
/* allocated, but not used... */
|
2016 |
DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
2017 |
return 0; |
2018 |
} |
2019 |
} |
2020 |
|
2021 |
if (check != used_clusters_count)
|
2022 |
return 0; |
2023 |
|
2024 |
return used_clusters_count;
|
2025 |
} |
2026 |
|
2027 |
static inline void adjust_mapping_indices(BDRVVVFATState* s, |
2028 |
int offset, int adjust) |
2029 |
{ |
2030 |
int i;
|
2031 |
|
2032 |
for (i = 0; i < s->mapping.next; i++) { |
2033 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2034 |
|
2035 |
#define ADJUST_MAPPING_INDEX(name) \
|
2036 |
if (mapping->name >= offset) \
|
2037 |
mapping->name += adjust |
2038 |
|
2039 |
ADJUST_MAPPING_INDEX(first_mapping_index); |
2040 |
if (mapping->mode & MODE_DIRECTORY)
|
2041 |
ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); |
2042 |
} |
2043 |
} |
2044 |
|
2045 |
/* insert or update mapping */
|
2046 |
static mapping_t* insert_mapping(BDRVVVFATState* s,
|
2047 |
uint32_t begin, uint32_t end) |
2048 |
{ |
2049 |
/*
|
2050 |
* - find mapping where mapping->begin >= begin,
|
2051 |
* - if mapping->begin > begin: insert
|
2052 |
* - adjust all references to mappings!
|
2053 |
* - else: adjust
|
2054 |
* - replace name
|
2055 |
*/
|
2056 |
int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); |
2057 |
mapping_t* mapping = NULL;
|
2058 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
2059 |
|
2060 |
if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
2061 |
&& mapping->begin < begin) { |
2062 |
mapping->end = begin; |
2063 |
index++; |
2064 |
mapping = array_get(&(s->mapping), index); |
2065 |
} |
2066 |
if (index >= s->mapping.next || mapping->begin > begin) {
|
2067 |
mapping = array_insert(&(s->mapping), index, 1);
|
2068 |
mapping->path = NULL;
|
2069 |
adjust_mapping_indices(s, index, +1);
|
2070 |
} |
2071 |
|
2072 |
mapping->begin = begin; |
2073 |
mapping->end = end; |
2074 |
|
2075 |
DLOG(mapping_t* next_mapping; |
2076 |
assert(index + 1 >= s->mapping.next ||
|
2077 |
((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
2078 |
next_mapping->begin >= end))); |
2079 |
|
2080 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
2081 |
s->current_mapping = array_get(&(s->mapping), |
2082 |
s->current_mapping - first_mapping); |
2083 |
|
2084 |
return mapping;
|
2085 |
} |
2086 |
|
2087 |
static int remove_mapping(BDRVVVFATState* s, int mapping_index) |
2088 |
{ |
2089 |
mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
2090 |
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
2091 |
|
2092 |
/* free mapping */
|
2093 |
if (mapping->first_mapping_index < 0) { |
2094 |
g_free(mapping->path); |
2095 |
} |
2096 |
|
2097 |
/* remove from s->mapping */
|
2098 |
array_remove(&(s->mapping), mapping_index); |
2099 |
|
2100 |
/* adjust all references to mappings */
|
2101 |
adjust_mapping_indices(s, mapping_index, -1);
|
2102 |
|
2103 |
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
2104 |
s->current_mapping = array_get(&(s->mapping), |
2105 |
s->current_mapping - first_mapping); |
2106 |
|
2107 |
return 0; |
2108 |
} |
2109 |
|
2110 |
static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
2111 |
{ |
2112 |
int i;
|
2113 |
for (i = 0; i < s->mapping.next; i++) { |
2114 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2115 |
if (mapping->dir_index >= offset)
|
2116 |
mapping->dir_index += adjust; |
2117 |
if ((mapping->mode & MODE_DIRECTORY) &&
|
2118 |
mapping->info.dir.first_dir_index >= offset) |
2119 |
mapping->info.dir.first_dir_index += adjust; |
2120 |
} |
2121 |
} |
2122 |
|
2123 |
static direntry_t* insert_direntries(BDRVVVFATState* s,
|
2124 |
int dir_index, int count) |
2125 |
{ |
2126 |
/*
|
2127 |
* make room in s->directory,
|
2128 |
* adjust_dirindices
|
2129 |
*/
|
2130 |
direntry_t* result = array_insert(&(s->directory), dir_index, count); |
2131 |
if (result == NULL) |
2132 |
return NULL; |
2133 |
adjust_dirindices(s, dir_index, count); |
2134 |
return result;
|
2135 |
} |
2136 |
|
2137 |
static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
2138 |
{ |
2139 |
int ret = array_remove_slice(&(s->directory), dir_index, count);
|
2140 |
if (ret)
|
2141 |
return ret;
|
2142 |
adjust_dirindices(s, dir_index, -count); |
2143 |
return 0; |
2144 |
} |
2145 |
|
2146 |
/*
|
2147 |
* Adapt the mappings of the cluster chain starting at first cluster
|
2148 |
* (i.e. if a file starts at first_cluster, the chain is followed according
|
2149 |
* to the modified fat, and the corresponding entries in s->mapping are
|
2150 |
* adjusted)
|
2151 |
*/
|
2152 |
static int commit_mappings(BDRVVVFATState* s, |
2153 |
uint32_t first_cluster, int dir_index)
|
2154 |
{ |
2155 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2156 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2157 |
uint32_t cluster = first_cluster; |
2158 |
|
2159 |
vvfat_close_current_file(s); |
2160 |
|
2161 |
assert(mapping); |
2162 |
assert(mapping->begin == first_cluster); |
2163 |
mapping->first_mapping_index = -1;
|
2164 |
mapping->dir_index = dir_index; |
2165 |
mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
2166 |
MODE_DIRECTORY : MODE_NORMAL; |
2167 |
|
2168 |
while (!fat_eof(s, cluster)) {
|
2169 |
uint32_t c, c1; |
2170 |
|
2171 |
for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; |
2172 |
c = c1, c1 = modified_fat_get(s, c1)); |
2173 |
|
2174 |
c++; |
2175 |
if (c > mapping->end) {
|
2176 |
int index = array_index(&(s->mapping), mapping);
|
2177 |
int i, max_i = s->mapping.next - index;
|
2178 |
for (i = 1; i < max_i && mapping[i].begin < c; i++); |
2179 |
while (--i > 0) |
2180 |
remove_mapping(s, index + 1);
|
2181 |
} |
2182 |
assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
2183 |
|| mapping[1].begin >= c);
|
2184 |
mapping->end = c; |
2185 |
|
2186 |
if (!fat_eof(s, c1)) {
|
2187 |
int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); |
2188 |
mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
2189 |
array_get(&(s->mapping), i); |
2190 |
|
2191 |
if (next_mapping == NULL || next_mapping->begin > c1) { |
2192 |
int i1 = array_index(&(s->mapping), mapping);
|
2193 |
|
2194 |
next_mapping = insert_mapping(s, c1, c1+1);
|
2195 |
|
2196 |
if (c1 < c)
|
2197 |
i1++; |
2198 |
mapping = array_get(&(s->mapping), i1); |
2199 |
} |
2200 |
|
2201 |
next_mapping->dir_index = mapping->dir_index; |
2202 |
next_mapping->first_mapping_index = |
2203 |
mapping->first_mapping_index < 0 ?
|
2204 |
array_index(&(s->mapping), mapping) : |
2205 |
mapping->first_mapping_index; |
2206 |
next_mapping->path = mapping->path; |
2207 |
next_mapping->mode = mapping->mode; |
2208 |
next_mapping->read_only = mapping->read_only; |
2209 |
if (mapping->mode & MODE_DIRECTORY) {
|
2210 |
next_mapping->info.dir.parent_mapping_index = |
2211 |
mapping->info.dir.parent_mapping_index; |
2212 |
next_mapping->info.dir.first_dir_index = |
2213 |
mapping->info.dir.first_dir_index + |
2214 |
0x10 * s->sectors_per_cluster *
|
2215 |
(mapping->end - mapping->begin); |
2216 |
} else
|
2217 |
next_mapping->info.file.offset = mapping->info.file.offset + |
2218 |
mapping->end - mapping->begin; |
2219 |
|
2220 |
mapping = next_mapping; |
2221 |
} |
2222 |
|
2223 |
cluster = c1; |
2224 |
} |
2225 |
|
2226 |
return 0; |
2227 |
} |
2228 |
|
2229 |
static int commit_direntries(BDRVVVFATState* s, |
2230 |
int dir_index, int parent_mapping_index) |
2231 |
{ |
2232 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2233 |
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
2234 |
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
2235 |
|
2236 |
int factor = 0x10 * s->sectors_per_cluster; |
2237 |
int old_cluster_count, new_cluster_count;
|
2238 |
int current_dir_index = mapping->info.dir.first_dir_index;
|
2239 |
int first_dir_index = current_dir_index;
|
2240 |
int ret, i;
|
2241 |
uint32_t c; |
2242 |
|
2243 |
DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
2244 |
|
2245 |
assert(direntry); |
2246 |
assert(mapping); |
2247 |
assert(mapping->begin == first_cluster); |
2248 |
assert(mapping->info.dir.first_dir_index < s->directory.next); |
2249 |
assert(mapping->mode & MODE_DIRECTORY); |
2250 |
assert(dir_index == 0 || is_directory(direntry));
|
2251 |
|
2252 |
mapping->info.dir.parent_mapping_index = parent_mapping_index; |
2253 |
|
2254 |
if (first_cluster == 0) { |
2255 |
old_cluster_count = new_cluster_count = |
2256 |
s->last_cluster_of_root_directory; |
2257 |
} else {
|
2258 |
for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2259 |
c = fat_get(s, c)) |
2260 |
old_cluster_count++; |
2261 |
|
2262 |
for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
2263 |
c = modified_fat_get(s, c)) |
2264 |
new_cluster_count++; |
2265 |
} |
2266 |
|
2267 |
if (new_cluster_count > old_cluster_count) {
|
2268 |
if (insert_direntries(s,
|
2269 |
current_dir_index + factor * old_cluster_count, |
2270 |
factor * (new_cluster_count - old_cluster_count)) == NULL)
|
2271 |
return -1; |
2272 |
} else if (new_cluster_count < old_cluster_count) |
2273 |
remove_direntries(s, |
2274 |
current_dir_index + factor * new_cluster_count, |
2275 |
factor * (old_cluster_count - new_cluster_count)); |
2276 |
|
2277 |
for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
2278 |
void* direntry = array_get(&(s->directory), current_dir_index);
|
2279 |
int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
2280 |
s->sectors_per_cluster); |
2281 |
if (ret)
|
2282 |
return ret;
|
2283 |
assert(!strncmp(s->directory.pointer, "QEMU", 4)); |
2284 |
current_dir_index += factor; |
2285 |
} |
2286 |
|
2287 |
ret = commit_mappings(s, first_cluster, dir_index); |
2288 |
if (ret)
|
2289 |
return ret;
|
2290 |
|
2291 |
/* recurse */
|
2292 |
for (i = 0; i < factor * new_cluster_count; i++) { |
2293 |
direntry = array_get(&(s->directory), first_dir_index + i); |
2294 |
if (is_directory(direntry) && !is_dot(direntry)) {
|
2295 |
mapping = find_mapping_for_cluster(s, first_cluster); |
2296 |
assert(mapping->mode & MODE_DIRECTORY); |
2297 |
ret = commit_direntries(s, first_dir_index + i, |
2298 |
array_index(&(s->mapping), mapping)); |
2299 |
if (ret)
|
2300 |
return ret;
|
2301 |
} |
2302 |
} |
2303 |
|
2304 |
return 0; |
2305 |
} |
2306 |
|
2307 |
/* commit one file (adjust contents, adjust mapping),
|
2308 |
return first_mapping_index */
|
2309 |
static int commit_one_file(BDRVVVFATState* s, |
2310 |
int dir_index, uint32_t offset)
|
2311 |
{ |
2312 |
direntry_t* direntry = array_get(&(s->directory), dir_index); |
2313 |
uint32_t c = begin_of_direntry(direntry); |
2314 |
uint32_t first_cluster = c; |
2315 |
mapping_t* mapping = find_mapping_for_cluster(s, c); |
2316 |
uint32_t size = filesize_of_direntry(direntry); |
2317 |
char* cluster = g_malloc(s->cluster_size);
|
2318 |
uint32_t i; |
2319 |
int fd = 0; |
2320 |
|
2321 |
assert(offset < size); |
2322 |
assert((offset % s->cluster_size) == 0);
|
2323 |
|
2324 |
for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
2325 |
c = modified_fat_get(s, c); |
2326 |
|
2327 |
fd = qemu_open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
|
2328 |
if (fd < 0) { |
2329 |
fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
2330 |
strerror(errno), errno); |
2331 |
g_free(cluster); |
2332 |
return fd;
|
2333 |
} |
2334 |
if (offset > 0) { |
2335 |
if (lseek(fd, offset, SEEK_SET) != offset) {
|
2336 |
qemu_close(fd); |
2337 |
g_free(cluster); |
2338 |
return -3; |
2339 |
} |
2340 |
} |
2341 |
|
2342 |
while (offset < size) {
|
2343 |
uint32_t c1; |
2344 |
int rest_size = (size - offset > s->cluster_size ?
|
2345 |
s->cluster_size : size - offset); |
2346 |
int ret;
|
2347 |
|
2348 |
c1 = modified_fat_get(s, c); |
2349 |
|
2350 |
assert((size - offset == 0 && fat_eof(s, c)) ||
|
2351 |
(size > offset && c >=2 && !fat_eof(s, c)));
|
2352 |
|
2353 |
ret = vvfat_read(s->bs, cluster2sector(s, c), |
2354 |
(uint8_t*)cluster, (rest_size + 0x1ff) / 0x200); |
2355 |
|
2356 |
if (ret < 0) { |
2357 |
qemu_close(fd); |
2358 |
g_free(cluster); |
2359 |
return ret;
|
2360 |
} |
2361 |
|
2362 |
if (write(fd, cluster, rest_size) < 0) { |
2363 |
qemu_close(fd); |
2364 |
g_free(cluster); |
2365 |
return -2; |
2366 |
} |
2367 |
|
2368 |
offset += rest_size; |
2369 |
c = c1; |
2370 |
} |
2371 |
|
2372 |
if (ftruncate(fd, size)) {
|
2373 |
perror("ftruncate()");
|
2374 |
qemu_close(fd); |
2375 |
g_free(cluster); |
2376 |
return -4; |
2377 |
} |
2378 |
qemu_close(fd); |
2379 |
g_free(cluster); |
2380 |
|
2381 |
return commit_mappings(s, first_cluster, dir_index);
|
2382 |
} |
2383 |
|
2384 |
#ifdef DEBUG
|
2385 |
/* test, if all mappings point to valid direntries */
|
2386 |
static void check1(BDRVVVFATState* s) |
2387 |
{ |
2388 |
int i;
|
2389 |
for (i = 0; i < s->mapping.next; i++) { |
2390 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2391 |
if (mapping->mode & MODE_DELETED) {
|
2392 |
fprintf(stderr, "deleted\n");
|
2393 |
continue;
|
2394 |
} |
2395 |
assert(mapping->dir_index < s->directory.next); |
2396 |
direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
2397 |
assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
2398 |
if (mapping->mode & MODE_DIRECTORY) {
|
2399 |
assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
2400 |
assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); |
2401 |
} |
2402 |
} |
2403 |
} |
2404 |
|
2405 |
/* test, if all direntries have mappings */
|
2406 |
static void check2(BDRVVVFATState* s) |
2407 |
{ |
2408 |
int i;
|
2409 |
int first_mapping = -1; |
2410 |
|
2411 |
for (i = 0; i < s->directory.next; i++) { |
2412 |
direntry_t* direntry = array_get(&(s->directory), i); |
2413 |
|
2414 |
if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
2415 |
mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
2416 |
assert(mapping); |
2417 |
assert(mapping->dir_index == i || is_dot(direntry)); |
2418 |
assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); |
2419 |
} |
2420 |
|
2421 |
if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
2422 |
/* cluster start */
|
2423 |
int j, count = 0; |
2424 |
|
2425 |
for (j = 0; j < s->mapping.next; j++) { |
2426 |
mapping_t* mapping = array_get(&(s->mapping), j); |
2427 |
if (mapping->mode & MODE_DELETED)
|
2428 |
continue;
|
2429 |
if (mapping->mode & MODE_DIRECTORY) {
|
2430 |
if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { |
2431 |
assert(++count == 1);
|
2432 |
if (mapping->first_mapping_index == -1) |
2433 |
first_mapping = array_index(&(s->mapping), mapping); |
2434 |
else
|
2435 |
assert(first_mapping == mapping->first_mapping_index); |
2436 |
if (mapping->info.dir.parent_mapping_index < 0) |
2437 |
assert(j == 0);
|
2438 |
else {
|
2439 |
mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
2440 |
assert(parent->mode & MODE_DIRECTORY); |
2441 |
assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); |
2442 |
} |
2443 |
} |
2444 |
} |
2445 |
} |
2446 |
if (count == 0) |
2447 |
first_mapping = -1;
|
2448 |
} |
2449 |
} |
2450 |
} |
2451 |
#endif
|
2452 |
|
2453 |
static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
2454 |
{ |
2455 |
int i;
|
2456 |
|
2457 |
#ifdef DEBUG
|
2458 |
fprintf(stderr, "handle_renames\n");
|
2459 |
for (i = 0; i < s->commits.next; i++) { |
2460 |
commit_t* commit = array_get(&(s->commits), i); |
2461 |
fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
2462 |
} |
2463 |
#endif
|
2464 |
|
2465 |
for (i = 0; i < s->commits.next;) { |
2466 |
commit_t* commit = array_get(&(s->commits), i); |
2467 |
if (commit->action == ACTION_RENAME) {
|
2468 |
mapping_t* mapping = find_mapping_for_cluster(s, |
2469 |
commit->param.rename.cluster); |
2470 |
char* old_path = mapping->path;
|
2471 |
|
2472 |
assert(commit->path); |
2473 |
mapping->path = commit->path; |
2474 |
if (rename(old_path, mapping->path))
|
2475 |
return -2; |
2476 |
|
2477 |
if (mapping->mode & MODE_DIRECTORY) {
|
2478 |
int l1 = strlen(mapping->path);
|
2479 |
int l2 = strlen(old_path);
|
2480 |
int diff = l1 - l2;
|
2481 |
direntry_t* direntry = array_get(&(s->directory), |
2482 |
mapping->info.dir.first_dir_index); |
2483 |
uint32_t c = mapping->begin; |
2484 |
int i = 0; |
2485 |
|
2486 |
/* recurse */
|
2487 |
while (!fat_eof(s, c)) {
|
2488 |
do {
|
2489 |
direntry_t* d = direntry + i; |
2490 |
|
2491 |
if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
2492 |
mapping_t* m = find_mapping_for_cluster(s, |
2493 |
begin_of_direntry(d)); |
2494 |
int l = strlen(m->path);
|
2495 |
char* new_path = g_malloc(l + diff + 1); |
2496 |
|
2497 |
assert(!strncmp(m->path, mapping->path, l2)); |
2498 |
|
2499 |
pstrcpy(new_path, l + diff + 1, mapping->path);
|
2500 |
pstrcpy(new_path + l1, l + diff + 1 - l1,
|
2501 |
m->path + l2); |
2502 |
|
2503 |
schedule_rename(s, m->begin, new_path); |
2504 |
} |
2505 |
i++; |
2506 |
} while((i % (0x10 * s->sectors_per_cluster)) != 0); |
2507 |
c = fat_get(s, c); |
2508 |
} |
2509 |
} |
2510 |
|
2511 |
g_free(old_path); |
2512 |
array_remove(&(s->commits), i); |
2513 |
continue;
|
2514 |
} else if (commit->action == ACTION_MKDIR) { |
2515 |
mapping_t* mapping; |
2516 |
int j, parent_path_len;
|
2517 |
|
2518 |
#ifdef __MINGW32__
|
2519 |
if (mkdir(commit->path))
|
2520 |
return -5; |
2521 |
#else
|
2522 |
if (mkdir(commit->path, 0755)) |
2523 |
return -5; |
2524 |
#endif
|
2525 |
|
2526 |
mapping = insert_mapping(s, commit->param.mkdir.cluster, |
2527 |
commit->param.mkdir.cluster + 1);
|
2528 |
if (mapping == NULL) |
2529 |
return -6; |
2530 |
|
2531 |
mapping->mode = MODE_DIRECTORY; |
2532 |
mapping->read_only = 0;
|
2533 |
mapping->path = commit->path; |
2534 |
j = s->directory.next; |
2535 |
assert(j); |
2536 |
insert_direntries(s, s->directory.next, |
2537 |
0x10 * s->sectors_per_cluster);
|
2538 |
mapping->info.dir.first_dir_index = j; |
2539 |
|
2540 |
parent_path_len = strlen(commit->path) |
2541 |
- strlen(get_basename(commit->path)) - 1;
|
2542 |
for (j = 0; j < s->mapping.next; j++) { |
2543 |
mapping_t* m = array_get(&(s->mapping), j); |
2544 |
if (m->first_mapping_index < 0 && m != mapping && |
2545 |
!strncmp(m->path, mapping->path, parent_path_len) && |
2546 |
strlen(m->path) == parent_path_len) |
2547 |
break;
|
2548 |
} |
2549 |
assert(j < s->mapping.next); |
2550 |
mapping->info.dir.parent_mapping_index = j; |
2551 |
|
2552 |
array_remove(&(s->commits), i); |
2553 |
continue;
|
2554 |
} |
2555 |
|
2556 |
i++; |
2557 |
} |
2558 |
return 0; |
2559 |
} |
2560 |
|
2561 |
/*
|
2562 |
* TODO: make sure that the short name is not matching *another* file
|
2563 |
*/
|
2564 |
static int handle_commits(BDRVVVFATState* s) |
2565 |
{ |
2566 |
int i, fail = 0; |
2567 |
|
2568 |
vvfat_close_current_file(s); |
2569 |
|
2570 |
for (i = 0; !fail && i < s->commits.next; i++) { |
2571 |
commit_t* commit = array_get(&(s->commits), i); |
2572 |
switch(commit->action) {
|
2573 |
case ACTION_RENAME: case ACTION_MKDIR: |
2574 |
abort(); |
2575 |
fail = -2;
|
2576 |
break;
|
2577 |
case ACTION_WRITEOUT: {
|
2578 |
#ifndef NDEBUG
|
2579 |
/* these variables are only used by assert() below */
|
2580 |
direntry_t* entry = array_get(&(s->directory), |
2581 |
commit->param.writeout.dir_index); |
2582 |
uint32_t begin = begin_of_direntry(entry); |
2583 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2584 |
#endif
|
2585 |
|
2586 |
assert(mapping); |
2587 |
assert(mapping->begin == begin); |
2588 |
assert(commit->path == NULL);
|
2589 |
|
2590 |
if (commit_one_file(s, commit->param.writeout.dir_index,
|
2591 |
commit->param.writeout.modified_offset)) |
2592 |
fail = -3;
|
2593 |
|
2594 |
break;
|
2595 |
} |
2596 |
case ACTION_NEW_FILE: {
|
2597 |
int begin = commit->param.new_file.first_cluster;
|
2598 |
mapping_t* mapping = find_mapping_for_cluster(s, begin); |
2599 |
direntry_t* entry; |
2600 |
int i;
|
2601 |
|
2602 |
/* find direntry */
|
2603 |
for (i = 0; i < s->directory.next; i++) { |
2604 |
entry = array_get(&(s->directory), i); |
2605 |
if (is_file(entry) && begin_of_direntry(entry) == begin)
|
2606 |
break;
|
2607 |
} |
2608 |
|
2609 |
if (i >= s->directory.next) {
|
2610 |
fail = -6;
|
2611 |
continue;
|
2612 |
} |
2613 |
|
2614 |
/* make sure there exists an initial mapping */
|
2615 |
if (mapping && mapping->begin != begin) {
|
2616 |
mapping->end = begin; |
2617 |
mapping = NULL;
|
2618 |
} |
2619 |
if (mapping == NULL) { |
2620 |
mapping = insert_mapping(s, begin, begin+1);
|
2621 |
} |
2622 |
/* most members will be fixed in commit_mappings() */
|
2623 |
assert(commit->path); |
2624 |
mapping->path = commit->path; |
2625 |
mapping->read_only = 0;
|
2626 |
mapping->mode = MODE_NORMAL; |
2627 |
mapping->info.file.offset = 0;
|
2628 |
|
2629 |
if (commit_one_file(s, i, 0)) |
2630 |
fail = -7;
|
2631 |
|
2632 |
break;
|
2633 |
} |
2634 |
default:
|
2635 |
abort(); |
2636 |
} |
2637 |
} |
2638 |
if (i > 0 && array_remove_slice(&(s->commits), 0, i)) |
2639 |
return -1; |
2640 |
return fail;
|
2641 |
} |
2642 |
|
2643 |
static int handle_deletes(BDRVVVFATState* s) |
2644 |
{ |
2645 |
int i, deferred = 1, deleted = 1; |
2646 |
|
2647 |
/* delete files corresponding to mappings marked as deleted */
|
2648 |
/* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
2649 |
while (deferred && deleted) {
|
2650 |
deferred = 0;
|
2651 |
deleted = 0;
|
2652 |
|
2653 |
for (i = 1; i < s->mapping.next; i++) { |
2654 |
mapping_t* mapping = array_get(&(s->mapping), i); |
2655 |
if (mapping->mode & MODE_DELETED) {
|
2656 |
direntry_t* entry = array_get(&(s->directory), |
2657 |
mapping->dir_index); |
2658 |
|
2659 |
if (is_free(entry)) {
|
2660 |
/* remove file/directory */
|
2661 |
if (mapping->mode & MODE_DIRECTORY) {
|
2662 |
int j, next_dir_index = s->directory.next,
|
2663 |
first_dir_index = mapping->info.dir.first_dir_index; |
2664 |
|
2665 |
if (rmdir(mapping->path) < 0) { |
2666 |
if (errno == ENOTEMPTY) {
|
2667 |
deferred++; |
2668 |
continue;
|
2669 |
} else
|
2670 |
return -5; |
2671 |
} |
2672 |
|
2673 |
for (j = 1; j < s->mapping.next; j++) { |
2674 |
mapping_t* m = array_get(&(s->mapping), j); |
2675 |
if (m->mode & MODE_DIRECTORY &&
|
2676 |
m->info.dir.first_dir_index > |
2677 |
first_dir_index && |
2678 |
m->info.dir.first_dir_index < |
2679 |
next_dir_index) |
2680 |
next_dir_index = |
2681 |
m->info.dir.first_dir_index; |
2682 |
} |
2683 |
remove_direntries(s, first_dir_index, |
2684 |
next_dir_index - first_dir_index); |
2685 |
|
2686 |
deleted++; |
2687 |
} |
2688 |
} else {
|
2689 |
if (unlink(mapping->path))
|
2690 |
return -4; |
2691 |
deleted++; |
2692 |
} |
2693 |
DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
2694 |
remove_mapping(s, i); |
2695 |
} |
2696 |
} |
2697 |
} |
2698 |
|
2699 |
return 0; |
2700 |
} |
2701 |
|
2702 |
/*
|
2703 |
* synchronize mapping with new state:
|
2704 |
*
|
2705 |
* - copy FAT (with bdrv_read)
|
2706 |
* - mark all filenames corresponding to mappings as deleted
|
2707 |
* - recurse direntries from root (using bs->bdrv_read)
|
2708 |
* - delete files corresponding to mappings marked as deleted
|
2709 |
*/
|
2710 |
static int do_commit(BDRVVVFATState* s) |
2711 |
{ |
2712 |
int ret = 0; |
2713 |
|
2714 |
/* the real meat are the commits. Nothing to do? Move along! */
|
2715 |
if (s->commits.next == 0) |
2716 |
return 0; |
2717 |
|
2718 |
vvfat_close_current_file(s); |
2719 |
|
2720 |
ret = handle_renames_and_mkdirs(s); |
2721 |
if (ret) {
|
2722 |
fprintf(stderr, "Error handling renames (%d)\n", ret);
|
2723 |
abort(); |
2724 |
return ret;
|
2725 |
} |
2726 |
|
2727 |
/* copy FAT (with bdrv_read) */
|
2728 |
memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
2729 |
|
2730 |
/* recurse direntries from root (using bs->bdrv_read) */
|
2731 |
ret = commit_direntries(s, 0, -1); |
2732 |
if (ret) {
|
2733 |
fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
2734 |
abort(); |
2735 |
return ret;
|
2736 |
} |
2737 |
|
2738 |
ret = handle_commits(s); |
2739 |
if (ret) {
|
2740 |
fprintf(stderr, "Error handling commits (%d)\n", ret);
|
2741 |
abort(); |
2742 |
return ret;
|
2743 |
} |
2744 |
|
2745 |
ret = handle_deletes(s); |
2746 |
if (ret) {
|
2747 |
fprintf(stderr, "Error deleting\n");
|
2748 |
abort(); |
2749 |
return ret;
|
2750 |
} |
2751 |
|
2752 |
if (s->qcow->drv->bdrv_make_empty) {
|
2753 |
s->qcow->drv->bdrv_make_empty(s->qcow); |
2754 |
} |
2755 |
|
2756 |
memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
2757 |
|
2758 |
DLOG(checkpoint()); |
2759 |
return 0; |
2760 |
} |
2761 |
|
2762 |
static int try_commit(BDRVVVFATState* s) |
2763 |
{ |
2764 |
vvfat_close_current_file(s); |
2765 |
DLOG(checkpoint()); |
2766 |
if(!is_consistent(s))
|
2767 |
return -1; |
2768 |
return do_commit(s);
|
2769 |
} |
2770 |
|
2771 |
static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
2772 |
const uint8_t *buf, int nb_sectors) |
2773 |
{ |
2774 |
BDRVVVFATState *s = bs->opaque; |
2775 |
int i, ret;
|
2776 |
|
2777 |
DLOG(checkpoint()); |
2778 |
|
2779 |
/* Check if we're operating in read-only mode */
|
2780 |
if (s->qcow == NULL) { |
2781 |
return -EACCES;
|
2782 |
} |
2783 |
|
2784 |
vvfat_close_current_file(s); |
2785 |
|
2786 |
/*
|
2787 |
* Some sanity checks:
|
2788 |
* - do not allow writing to the boot sector
|
2789 |
* - do not allow to write non-ASCII filenames
|
2790 |
*/
|
2791 |
|
2792 |
if (sector_num < s->first_sectors_number)
|
2793 |
return -1; |
2794 |
|
2795 |
for (i = sector2cluster(s, sector_num);
|
2796 |
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
2797 |
mapping_t* mapping = find_mapping_for_cluster(s, i); |
2798 |
if (mapping) {
|
2799 |
if (mapping->read_only) {
|
2800 |
fprintf(stderr, "Tried to write to write-protected file %s\n",
|
2801 |
mapping->path); |
2802 |
return -1; |
2803 |
} |
2804 |
|
2805 |
if (mapping->mode & MODE_DIRECTORY) {
|
2806 |
int begin = cluster2sector(s, i);
|
2807 |
int end = begin + s->sectors_per_cluster, k;
|
2808 |
int dir_index;
|
2809 |
const direntry_t* direntries;
|
2810 |
long_file_name lfn; |
2811 |
|
2812 |
lfn_init(&lfn); |
2813 |
|
2814 |
if (begin < sector_num)
|
2815 |
begin = sector_num; |
2816 |
if (end > sector_num + nb_sectors)
|
2817 |
end = sector_num + nb_sectors; |
2818 |
dir_index = mapping->dir_index + |
2819 |
0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
2820 |
direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
2821 |
|
2822 |
for (k = 0; k < (end - begin) * 0x10; k++) { |
2823 |
/* do not allow non-ASCII filenames */
|
2824 |
if (parse_long_name(&lfn, direntries + k) < 0) { |
2825 |
fprintf(stderr, "Warning: non-ASCII filename\n");
|
2826 |
return -1; |
2827 |
} |
2828 |
/* no access to the direntry of a read-only file */
|
2829 |
else if (is_short_name(direntries+k) && |
2830 |
(direntries[k].attributes & 1)) {
|
2831 |
if (memcmp(direntries + k,
|
2832 |
array_get(&(s->directory), dir_index + k), |
2833 |
sizeof(direntry_t))) {
|
2834 |
fprintf(stderr, "Warning: tried to write to write-protected file\n");
|
2835 |
return -1; |
2836 |
} |
2837 |
} |
2838 |
} |
2839 |
} |
2840 |
i = mapping->end; |
2841 |
} else
|
2842 |
i++; |
2843 |
} |
2844 |
|
2845 |
/*
|
2846 |
* Use qcow backend. Commit later.
|
2847 |
*/
|
2848 |
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); |
2849 |
ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
2850 |
if (ret < 0) { |
2851 |
fprintf(stderr, "Error writing to qcow backend\n");
|
2852 |
return ret;
|
2853 |
} |
2854 |
|
2855 |
for (i = sector2cluster(s, sector_num);
|
2856 |
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
2857 |
if (i >= 0) |
2858 |
s->used_clusters[i] |= USED_ALLOCATED; |
2859 |
|
2860 |
DLOG(checkpoint()); |
2861 |
/* TODO: add timeout */
|
2862 |
try_commit(s); |
2863 |
|
2864 |
DLOG(checkpoint()); |
2865 |
return 0; |
2866 |
} |
2867 |
|
2868 |
static coroutine_fn int vvfat_co_write(BlockDriverState *bs, int64_t sector_num, |
2869 |
const uint8_t *buf, int nb_sectors) |
2870 |
{ |
2871 |
int ret;
|
2872 |
BDRVVVFATState *s = bs->opaque; |
2873 |
qemu_co_mutex_lock(&s->lock); |
2874 |
ret = vvfat_write(bs, sector_num, buf, nb_sectors); |
2875 |
qemu_co_mutex_unlock(&s->lock); |
2876 |
return ret;
|
2877 |
} |
2878 |
|
2879 |
static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
|
2880 |
int64_t sector_num, int nb_sectors, int* n) |
2881 |
{ |
2882 |
BDRVVVFATState* s = bs->opaque; |
2883 |
*n = s->sector_count - sector_num; |
2884 |
if (*n > nb_sectors) {
|
2885 |
*n = nb_sectors; |
2886 |
} else if (*n < 0) { |
2887 |
return 0; |
2888 |
} |
2889 |
return BDRV_BLOCK_DATA;
|
2890 |
} |
2891 |
|
2892 |
static int write_target_commit(BlockDriverState *bs, int64_t sector_num, |
2893 |
const uint8_t* buffer, int nb_sectors) { |
2894 |
BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque); |
2895 |
return try_commit(s);
|
2896 |
} |
2897 |
|
2898 |
static void write_target_close(BlockDriverState *bs) { |
2899 |
BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque); |
2900 |
bdrv_unref(s->qcow); |
2901 |
g_free(s->qcow_filename); |
2902 |
} |
2903 |
|
2904 |
static BlockDriver vvfat_write_target = {
|
2905 |
.format_name = "vvfat_write_target",
|
2906 |
.bdrv_write = write_target_commit, |
2907 |
.bdrv_close = write_target_close, |
2908 |
}; |
2909 |
|
2910 |
static int enable_write_target(BDRVVVFATState *s) |
2911 |
{ |
2912 |
BlockDriver *bdrv_qcow; |
2913 |
QEMUOptionParameter *options; |
2914 |
Error *local_err = NULL;
|
2915 |
int ret;
|
2916 |
int size = sector2cluster(s, s->sector_count);
|
2917 |
s->used_clusters = calloc(size, 1);
|
2918 |
|
2919 |
array_init(&(s->commits), sizeof(commit_t));
|
2920 |
|
2921 |
s->qcow_filename = g_malloc(1024);
|
2922 |
ret = get_tmp_filename(s->qcow_filename, 1024);
|
2923 |
if (ret < 0) { |
2924 |
goto err;
|
2925 |
} |
2926 |
|
2927 |
bdrv_qcow = bdrv_find_format("qcow");
|
2928 |
options = parse_option_parameters("", bdrv_qcow->create_options, NULL); |
2929 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, s->sector_count * 512);
|
2930 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, "fat:");
|
2931 |
|
2932 |
ret = bdrv_create(bdrv_qcow, s->qcow_filename, options, &local_err); |
2933 |
if (ret < 0) { |
2934 |
qerror_report_err(local_err); |
2935 |
error_free(local_err); |
2936 |
goto err;
|
2937 |
} |
2938 |
|
2939 |
s->qcow = NULL;
|
2940 |
ret = bdrv_open(&s->qcow, s->qcow_filename, NULL, NULL, |
2941 |
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, bdrv_qcow, |
2942 |
&local_err); |
2943 |
if (ret < 0) { |
2944 |
qerror_report_err(local_err); |
2945 |
error_free(local_err); |
2946 |
goto err;
|
2947 |
} |
2948 |
|
2949 |
#ifndef _WIN32
|
2950 |
unlink(s->qcow_filename); |
2951 |
#endif
|
2952 |
|
2953 |
s->bs->backing_hd = bdrv_new("");
|
2954 |
s->bs->backing_hd->drv = &vvfat_write_target; |
2955 |
s->bs->backing_hd->opaque = g_malloc(sizeof(void*)); |
2956 |
*(void**)s->bs->backing_hd->opaque = s;
|
2957 |
|
2958 |
return 0; |
2959 |
|
2960 |
err:
|
2961 |
g_free(s->qcow_filename); |
2962 |
s->qcow_filename = NULL;
|
2963 |
return ret;
|
2964 |
} |
2965 |
|
2966 |
static void vvfat_close(BlockDriverState *bs) |
2967 |
{ |
2968 |
BDRVVVFATState *s = bs->opaque; |
2969 |
|
2970 |
vvfat_close_current_file(s); |
2971 |
array_free(&(s->fat)); |
2972 |
array_free(&(s->directory)); |
2973 |
array_free(&(s->mapping)); |
2974 |
g_free(s->cluster_buffer); |
2975 |
|
2976 |
if (s->qcow) {
|
2977 |
migrate_del_blocker(s->migration_blocker); |
2978 |
error_free(s->migration_blocker); |
2979 |
} |
2980 |
} |
2981 |
|
2982 |
static BlockDriver bdrv_vvfat = {
|
2983 |
.format_name = "vvfat",
|
2984 |
.protocol_name = "fat",
|
2985 |
.instance_size = sizeof(BDRVVVFATState),
|
2986 |
|
2987 |
.bdrv_parse_filename = vvfat_parse_filename, |
2988 |
.bdrv_file_open = vvfat_open, |
2989 |
.bdrv_close = vvfat_close, |
2990 |
.bdrv_rebind = vvfat_rebind, |
2991 |
|
2992 |
.bdrv_read = vvfat_co_read, |
2993 |
.bdrv_write = vvfat_co_write, |
2994 |
.bdrv_co_get_block_status = vvfat_co_get_block_status, |
2995 |
}; |
2996 |
|
2997 |
static void bdrv_vvfat_init(void) |
2998 |
{ |
2999 |
bdrv_register(&bdrv_vvfat); |
3000 |
} |
3001 |
|
3002 |
block_init(bdrv_vvfat_init); |
3003 |
|
3004 |
#ifdef DEBUG
|
3005 |
static void checkpoint(void) { |
3006 |
assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
3007 |
check1(vvv); |
3008 |
check2(vvv); |
3009 |
assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); |
3010 |
#if 0
|
3011 |
if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
|
3012 |
fprintf(stderr, "Nonono!\n");
|
3013 |
mapping_t* mapping;
|
3014 |
direntry_t* direntry;
|
3015 |
assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
|
3016 |
assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
|
3017 |
if (vvv->mapping.next<47)
|
3018 |
return;
|
3019 |
assert((mapping = array_get(&(vvv->mapping), 47)));
|
3020 |
assert(mapping->dir_index < vvv->directory.next);
|
3021 |
direntry = array_get(&(vvv->directory), mapping->dir_index);
|
3022 |
assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
|
3023 |
#endif
|
3024 |
} |
3025 |
#endif
|