d470ad42ac
We currently do not guard everywhere against a NULL bs->drv where we should be doing so. Most of the places fixed here just do not care about that case at all. Some care implicitly, e.g. through a prior function call to bdrv_getlength() which would always fail for an ejected BDS. Add an assert there to make it more obvious. Other places seem to care, but do so insufficiently: Freeing clusters in a qcow2 image is an error-free operation, but it may leave the image in an unusable state anyway. Giving qcow2_free_clusters() an error code is not really viable, it is much easier to note that bs->drv may be NULL even after a successful driver call. This concerns bdrv_co_flush(), and the way the check is added to bdrv_co_pdiscard() (in every iteration instead of only once). Finally, some places employ at least an assert(bs->drv); somewhere, that may be reasonable (such as in the reopen code), but in bdrv_has_zero_init(), it is definitely not. Returning 0 there in case of an ejected BDS saves us much headache instead. Reported-by: R. Nageswara Sastry <nasastry@in.ibm.com> Buglink: https://bugs.launchpad.net/qemu/+bug/1728660 Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20171110203111.7666-4-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
3277 lines
101 KiB
C
3277 lines
101 KiB
C
/* vim:set shiftwidth=4 ts=4: */
|
|
/*
|
|
* 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 "qemu/osdep.h"
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#include <dirent.h>
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#include "qapi/error.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "qemu/bswap.h"
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#include "migration/blocker.h"
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#include "qapi/qmp/qbool.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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|
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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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|
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static void checkpoint(void);
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#else
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#define DLOG(a)
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#endif
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/* bootsector OEM name. see related compatibility problems at:
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* https://jdebp.eu/FGA/volume-boot-block-oem-name-field.html
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* http://seasip.info/Misc/oemid.html
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*/
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#define BOOTSECTOR_OEM_NAME "MSWIN4.1"
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#define DIR_DELETED 0xe5
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#define DIR_KANJI DIR_DELETED
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#define DIR_KANJI_FAKE 0x05
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#define DIR_FREE 0x00
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|
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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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|
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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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|
|
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static inline int array_ensure_allocated(array_t* array, int index)
|
|
{
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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);
|
|
if (!array->pointer)
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return -1;
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memset(array->pointer + array->size, 0, new_size - array->size);
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array->size = new_size;
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array->next = index + 1;
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}
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|
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return 0;
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|
}
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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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|
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if (array_ensure_allocated(array, next) < 0)
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return NULL;
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|
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array->next = next + 1;
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return array_get(array, next);
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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);
|
|
if(!array->pointer)
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return NULL;
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array->size+=increment;
|
|
}
|
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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
|
|
* index_to, but the order of all other elements is preserved. */
|
|
static inline int array_roll(array_t* array,int index_to,int index_from,int count)
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|
{
|
|
char* buf;
|
|
char* from;
|
|
char* to;
|
|
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)
|
|
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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|
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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)
|
|
{
|
|
assert(index >=0);
|
|
assert(count > 0);
|
|
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)
|
|
{
|
|
return array_remove_slice(array, index, 1);
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|
}
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|
|
/* return the index for a given member */
|
|
static int array_index(array_t* array, void* pointer)
|
|
{
|
|
size_t offset = (char*)pointer - array->pointer;
|
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assert((offset % array->item_size) == 0);
|
|
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 reserved1;
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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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uint8_t fat_type[8];
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|
uint8_t ignored[0x1c0];
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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_dir;
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uint16_t info_sector;
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uint16_t backup_boot_sector;
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uint8_t reserved[12];
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uint8_t drive_number;
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uint8_t reserved1;
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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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uint8_t fat_type[8];
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uint8_t ignored[0x1a4];
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} QEMU_PACKED fat32;
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} u;
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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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|
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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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|
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/* this structure are used to transparently access the files */
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|
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typedef struct mapping_t {
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|
/* begin is the first cluster, end is the last+1 */
|
|
uint32_t begin,end;
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|
/* as s->directory is growable, no pointer may be used here */
|
|
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
|
|
* - the offset in the file (in clusters) for a file, or
|
|
* - the next cluster of the directory for a directory
|
|
*/
|
|
struct {
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|
uint32_t offset;
|
|
} file;
|
|
struct {
|
|
int parent_mapping_index;
|
|
int first_dir_index;
|
|
} dir;
|
|
} info;
|
|
/* path contains the full path, i.e. it always starts with s->path */
|
|
char* path;
|
|
|
|
enum {
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|
MODE_UNDEFINED = 0,
|
|
MODE_NORMAL = 1,
|
|
MODE_MODIFIED = 2,
|
|
MODE_DIRECTORY = 4,
|
|
MODE_DELETED = 8,
|
|
} mode;
|
|
int read_only;
|
|
} mapping_t;
|
|
|
|
#ifdef DEBUG
|
|
static void print_direntry(const struct direntry_t*);
|
|
static void print_mapping(const struct mapping_t* mapping);
|
|
#endif
|
|
|
|
/* here begins the real VVFAT driver */
|
|
|
|
typedef struct BDRVVVFATState {
|
|
CoMutex lock;
|
|
BlockDriverState* bs; /* pointer to parent */
|
|
unsigned char first_sectors[0x40*0x200];
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|
|
int fat_type; /* 16 or 32 */
|
|
array_t fat,directory,mapping;
|
|
char volume_label[11];
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|
|
uint32_t offset_to_bootsector; /* 0 for floppy, 0x3f for disk */
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|
|
unsigned int cluster_size;
|
|
unsigned int sectors_per_cluster;
|
|
unsigned int sectors_per_fat;
|
|
uint32_t last_cluster_of_root_directory;
|
|
/* how many entries are available in root directory (0 for FAT32) */
|
|
uint16_t root_entries;
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uint32_t sector_count; /* total number of sectors of the partition */
|
|
uint32_t cluster_count; /* total number of clusters of this partition */
|
|
uint32_t max_fat_value;
|
|
uint32_t offset_to_fat;
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|
uint32_t offset_to_root_dir;
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|
|
|
int current_fd;
|
|
mapping_t* current_mapping;
|
|
unsigned char* cluster; /* points to current cluster */
|
|
unsigned char* cluster_buffer; /* points to a buffer to hold temp data */
|
|
unsigned int current_cluster;
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|
|
|
/* write support */
|
|
char* qcow_filename;
|
|
BdrvChild* qcow;
|
|
void* fat2;
|
|
char* used_clusters;
|
|
array_t commits;
|
|
const char* path;
|
|
int downcase_short_names;
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|
|
|
Error *migration_blocker;
|
|
} BDRVVVFATState;
|
|
|
|
/* take the sector position spos and convert it to Cylinder/Head/Sector position
|
|
* if the position is outside the specified geometry, fill maximum value for CHS
|
|
* and return 1 to signal overflow.
|
|
*/
|
|
static int sector2CHS(mbr_chs_t *chs, int spos, int cyls, int heads, int secs)
|
|
{
|
|
int head,sector;
|
|
sector = spos % secs; spos /= secs;
|
|
head = spos % heads; spos /= heads;
|
|
if (spos >= cyls) {
|
|
/* Overflow,
|
|
it happens if 32bit sector positions are used, while CHS is only 24bit.
|
|
Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */
|
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chs->head = 0xFF;
|
|
chs->sector = 0xFF;
|
|
chs->cylinder = 0xFF;
|
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return 1;
|
|
}
|
|
chs->head = (uint8_t)head;
|
|
chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
|
|
chs->cylinder = (uint8_t)spos;
|
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return 0;
|
|
}
|
|
|
|
static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
|
|
{
|
|
/* TODO: if the files mbr.img and bootsect.img exist, use them */
|
|
mbr_t* real_mbr=(mbr_t*)s->first_sectors;
|
|
partition_t* partition = &(real_mbr->partition[0]);
|
|
int lba;
|
|
|
|
memset(s->first_sectors,0,512);
|
|
|
|
/* Win NT Disk Signature */
|
|
real_mbr->nt_id= cpu_to_le32(0xbe1afdfa);
|
|
|
|
partition->attributes=0x80; /* bootable */
|
|
|
|
/* LBA is used when partition is outside the CHS geometry */
|
|
lba = sector2CHS(&partition->start_CHS, s->offset_to_bootsector,
|
|
cyls, heads, secs);
|
|
lba |= sector2CHS(&partition->end_CHS, s->bs->total_sectors - 1,
|
|
cyls, heads, secs);
|
|
|
|
/*LBA partitions are identified only by start/length_sector_long not by CHS*/
|
|
partition->start_sector_long = cpu_to_le32(s->offset_to_bootsector);
|
|
partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
|
|
- s->offset_to_bootsector);
|
|
|
|
/* FAT12/FAT16/FAT32 */
|
|
/* DOS uses different types when partition is LBA,
|
|
probably to prevent older versions from using CHS on them */
|
|
partition->fs_type = s->fat_type == 12 ? 0x1 :
|
|
s->fat_type == 16 ? (lba ? 0xe : 0x06) :
|
|
/*s->fat_type == 32*/ (lba ? 0xc : 0x0b);
|
|
|
|
real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
|
|
}
|
|
|
|
/* direntry functions */
|
|
|
|
static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
|
|
{
|
|
int number_of_entries, i;
|
|
glong length;
|
|
direntry_t *entry;
|
|
|
|
gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
|
|
if (!longname) {
|
|
fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
|
|
return NULL;
|
|
}
|
|
|
|
number_of_entries = DIV_ROUND_UP(length * 2, 26);
|
|
|
|
for(i=0;i<number_of_entries;i++) {
|
|
entry=array_get_next(&(s->directory));
|
|
entry->attributes=0xf;
|
|
entry->reserved[0]=0;
|
|
entry->begin=0;
|
|
entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
|
|
}
|
|
for(i=0;i<26*number_of_entries;i++) {
|
|
int offset=(i%26);
|
|
if(offset<10) offset=1+offset;
|
|
else if(offset<22) offset=14+offset-10;
|
|
else offset=28+offset-22;
|
|
entry=array_get(&(s->directory),s->directory.next-1-(i/26));
|
|
if (i >= 2 * length + 2) {
|
|
entry->name[offset] = 0xff;
|
|
} else if (i % 2 == 0) {
|
|
entry->name[offset] = longname[i / 2] & 0xff;
|
|
} else {
|
|
entry->name[offset] = longname[i / 2] >> 8;
|
|
}
|
|
}
|
|
g_free(longname);
|
|
return array_get(&(s->directory),s->directory.next-number_of_entries);
|
|
}
|
|
|
|
static char is_free(const direntry_t* direntry)
|
|
{
|
|
return direntry->name[0] == DIR_DELETED || direntry->name[0] == DIR_FREE;
|
|
}
|
|
|
|
static char is_volume_label(const direntry_t* direntry)
|
|
{
|
|
return direntry->attributes == 0x28;
|
|
}
|
|
|
|
static char is_long_name(const direntry_t* direntry)
|
|
{
|
|
return direntry->attributes == 0xf;
|
|
}
|
|
|
|
static char is_short_name(const direntry_t* direntry)
|
|
{
|
|
return !is_volume_label(direntry) && !is_long_name(direntry)
|
|
&& !is_free(direntry);
|
|
}
|
|
|
|
static char is_directory(const direntry_t* direntry)
|
|
{
|
|
return direntry->attributes & 0x10 && direntry->name[0] != DIR_DELETED;
|
|
}
|
|
|
|
static inline char is_dot(const direntry_t* direntry)
|
|
{
|
|
return is_short_name(direntry) && direntry->name[0] == '.';
|
|
}
|
|
|
|
static char is_file(const direntry_t* direntry)
|
|
{
|
|
return is_short_name(direntry) && !is_directory(direntry);
|
|
}
|
|
|
|
static inline uint32_t begin_of_direntry(const direntry_t* direntry)
|
|
{
|
|
return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
|
|
}
|
|
|
|
static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
|
|
{
|
|
return le32_to_cpu(direntry->size);
|
|
}
|
|
|
|
static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
|
|
{
|
|
direntry->begin = cpu_to_le16(begin & 0xffff);
|
|
direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
|
|
}
|
|
|
|
static uint8_t to_valid_short_char(gunichar c)
|
|
{
|
|
c = g_unichar_toupper(c);
|
|
if ((c >= '0' && c <= '9') ||
|
|
(c >= 'A' && c <= 'Z') ||
|
|
strchr("$%'-_@~`!(){}^#&", c) != 0) {
|
|
return c;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static direntry_t *create_short_filename(BDRVVVFATState *s,
|
|
const char *filename,
|
|
unsigned int directory_start)
|
|
{
|
|
int i, j = 0;
|
|
direntry_t *entry = array_get_next(&(s->directory));
|
|
const gchar *p, *last_dot = NULL;
|
|
gunichar c;
|
|
bool lossy_conversion = false;
|
|
char tail[8];
|
|
|
|
if (!entry) {
|
|
return NULL;
|
|
}
|
|
memset(entry->name, 0x20, sizeof(entry->name));
|
|
|
|
/* copy filename and search last dot */
|
|
for (p = filename; ; p = g_utf8_next_char(p)) {
|
|
c = g_utf8_get_char(p);
|
|
if (c == '\0') {
|
|
break;
|
|
} else if (c == '.') {
|
|
if (j == 0) {
|
|
/* '.' at start of filename */
|
|
lossy_conversion = true;
|
|
} else {
|
|
if (last_dot) {
|
|
lossy_conversion = true;
|
|
}
|
|
last_dot = p;
|
|
}
|
|
} else if (!last_dot) {
|
|
/* first part of the name; copy it */
|
|
uint8_t v = to_valid_short_char(c);
|
|
if (j < 8 && v) {
|
|
entry->name[j++] = v;
|
|
} else {
|
|
lossy_conversion = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* copy extension (if any) */
|
|
if (last_dot) {
|
|
j = 0;
|
|
for (p = g_utf8_next_char(last_dot); ; p = g_utf8_next_char(p)) {
|
|
c = g_utf8_get_char(p);
|
|
if (c == '\0') {
|
|
break;
|
|
} else {
|
|
/* extension; copy it */
|
|
uint8_t v = to_valid_short_char(c);
|
|
if (j < 3 && v) {
|
|
entry->name[8 + (j++)] = v;
|
|
} else {
|
|
lossy_conversion = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (entry->name[0] == DIR_KANJI) {
|
|
entry->name[0] = DIR_KANJI_FAKE;
|
|
}
|
|
|
|
/* numeric-tail generation */
|
|
for (j = 0; j < 8; j++) {
|
|
if (entry->name[j] == ' ') {
|
|
break;
|
|
}
|
|
}
|
|
for (i = lossy_conversion ? 1 : 0; i < 999999; i++) {
|
|
direntry_t *entry1;
|
|
if (i > 0) {
|
|
int len = snprintf(tail, sizeof(tail), "~%u", (unsigned)i);
|
|
assert(len <= 7);
|
|
memcpy(entry->name + MIN(j, 8 - len), tail, len);
|
|
}
|
|
for (entry1 = array_get(&(s->directory), directory_start);
|
|
entry1 < entry; entry1++) {
|
|
if (!is_long_name(entry1) &&
|
|
!memcmp(entry1->name, entry->name, 11)) {
|
|
break; /* found dupe */
|
|
}
|
|
}
|
|
if (entry1 == entry) {
|
|
/* no dupe found */
|
|
return entry;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* fat functions */
|
|
|
|
static inline uint8_t fat_chksum(const direntry_t* entry)
|
|
{
|
|
uint8_t chksum=0;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(entry->name); i++) {
|
|
chksum = (((chksum & 0xfe) >> 1) |
|
|
((chksum & 0x01) ? 0x80 : 0)) + entry->name[i];
|
|
}
|
|
|
|
return chksum;
|
|
}
|
|
|
|
/* if return_time==0, this returns the fat_date, else the fat_time */
|
|
static uint16_t fat_datetime(time_t time,int return_time) {
|
|
struct tm* t;
|
|
struct tm t1;
|
|
t = &t1;
|
|
localtime_r(&time,t);
|
|
if(return_time)
|
|
return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11));
|
|
return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9));
|
|
}
|
|
|
|
static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value)
|
|
{
|
|
if(s->fat_type==32) {
|
|
uint32_t* entry=array_get(&(s->fat),cluster);
|
|
*entry=cpu_to_le32(value);
|
|
} else if(s->fat_type==16) {
|
|
uint16_t* entry=array_get(&(s->fat),cluster);
|
|
*entry=cpu_to_le16(value&0xffff);
|
|
} else {
|
|
int offset = (cluster*3/2);
|
|
unsigned char* p = array_get(&(s->fat), offset);
|
|
switch (cluster&1) {
|
|
case 0:
|
|
p[0] = value&0xff;
|
|
p[1] = (p[1]&0xf0) | ((value>>8)&0xf);
|
|
break;
|
|
case 1:
|
|
p[0] = (p[0]&0xf) | ((value&0xf)<<4);
|
|
p[1] = (value>>4);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster)
|
|
{
|
|
if(s->fat_type==32) {
|
|
uint32_t* entry=array_get(&(s->fat),cluster);
|
|
return le32_to_cpu(*entry);
|
|
} else if(s->fat_type==16) {
|
|
uint16_t* entry=array_get(&(s->fat),cluster);
|
|
return le16_to_cpu(*entry);
|
|
} else {
|
|
const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
|
|
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
|
|
}
|
|
}
|
|
|
|
static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry)
|
|
{
|
|
if(fat_entry>s->max_fat_value-8)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static inline void init_fat(BDRVVVFATState* s)
|
|
{
|
|
if (s->fat_type == 12) {
|
|
array_init(&(s->fat),1);
|
|
array_ensure_allocated(&(s->fat),
|
|
s->sectors_per_fat * 0x200 * 3 / 2 - 1);
|
|
} else {
|
|
array_init(&(s->fat),(s->fat_type==32?4:2));
|
|
array_ensure_allocated(&(s->fat),
|
|
s->sectors_per_fat * 0x200 / s->fat.item_size - 1);
|
|
}
|
|
memset(s->fat.pointer,0,s->fat.size);
|
|
|
|
switch(s->fat_type) {
|
|
case 12: s->max_fat_value=0xfff; break;
|
|
case 16: s->max_fat_value=0xffff; break;
|
|
case 32: s->max_fat_value=0x0fffffff; break;
|
|
default: s->max_fat_value=0; /* error... */
|
|
}
|
|
|
|
}
|
|
|
|
static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
|
|
unsigned int directory_start, const char* filename, int is_dot)
|
|
{
|
|
int long_index = s->directory.next;
|
|
direntry_t* entry = NULL;
|
|
direntry_t* entry_long = NULL;
|
|
|
|
if(is_dot) {
|
|
entry=array_get_next(&(s->directory));
|
|
memset(entry->name, 0x20, sizeof(entry->name));
|
|
memcpy(entry->name,filename,strlen(filename));
|
|
return entry;
|
|
}
|
|
|
|
entry_long=create_long_filename(s,filename);
|
|
entry = create_short_filename(s, filename, directory_start);
|
|
|
|
/* calculate checksum; propagate to long name */
|
|
if(entry_long) {
|
|
uint8_t chksum=fat_chksum(entry);
|
|
|
|
/* calculate anew, because realloc could have taken place */
|
|
entry_long=array_get(&(s->directory),long_index);
|
|
while(entry_long<entry && is_long_name(entry_long)) {
|
|
entry_long->reserved[1]=chksum;
|
|
entry_long++;
|
|
}
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Read a directory. (the index of the corresponding mapping must be passed).
|
|
*/
|
|
static int read_directory(BDRVVVFATState* s, int mapping_index)
|
|
{
|
|
mapping_t* mapping = array_get(&(s->mapping), mapping_index);
|
|
direntry_t* direntry;
|
|
const char* dirname = mapping->path;
|
|
int first_cluster = mapping->begin;
|
|
int parent_index = mapping->info.dir.parent_mapping_index;
|
|
mapping_t* parent_mapping = (mapping_t*)
|
|
(parent_index >= 0 ? array_get(&(s->mapping), parent_index) : NULL);
|
|
int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1;
|
|
|
|
DIR* dir=opendir(dirname);
|
|
struct dirent* entry;
|
|
int i;
|
|
|
|
assert(mapping->mode & MODE_DIRECTORY);
|
|
|
|
if(!dir) {
|
|
mapping->end = mapping->begin;
|
|
return -1;
|
|
}
|
|
|
|
i = mapping->info.dir.first_dir_index =
|
|
first_cluster == 0 ? 0 : s->directory.next;
|
|
|
|
if (first_cluster != 0) {
|
|
/* create the top entries of a subdirectory */
|
|
(void)create_short_and_long_name(s, i, ".", 1);
|
|
(void)create_short_and_long_name(s, i, "..", 1);
|
|
}
|
|
|
|
/* actually read the directory, and allocate the mappings */
|
|
while((entry=readdir(dir))) {
|
|
unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
|
|
char* buffer;
|
|
direntry_t* direntry;
|
|
struct stat st;
|
|
int is_dot=!strcmp(entry->d_name,".");
|
|
int is_dotdot=!strcmp(entry->d_name,"..");
|
|
|
|
if (first_cluster == 0 && s->directory.next >= s->root_entries - 1) {
|
|
fprintf(stderr, "Too many entries in root directory\n");
|
|
closedir(dir);
|
|
return -2;
|
|
}
|
|
|
|
if(first_cluster == 0 && (is_dotdot || is_dot))
|
|
continue;
|
|
|
|
buffer = g_malloc(length);
|
|
snprintf(buffer,length,"%s/%s",dirname,entry->d_name);
|
|
|
|
if(stat(buffer,&st)<0) {
|
|
g_free(buffer);
|
|
continue;
|
|
}
|
|
|
|
/* create directory entry for this file */
|
|
if (!is_dot && !is_dotdot) {
|
|
direntry = create_short_and_long_name(s, i, entry->d_name, 0);
|
|
} else {
|
|
direntry = array_get(&(s->directory), is_dot ? i : i + 1);
|
|
}
|
|
direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
|
|
direntry->reserved[0]=direntry->reserved[1]=0;
|
|
direntry->ctime=fat_datetime(st.st_ctime,1);
|
|
direntry->cdate=fat_datetime(st.st_ctime,0);
|
|
direntry->adate=fat_datetime(st.st_atime,0);
|
|
direntry->begin_hi=0;
|
|
direntry->mtime=fat_datetime(st.st_mtime,1);
|
|
direntry->mdate=fat_datetime(st.st_mtime,0);
|
|
if(is_dotdot)
|
|
set_begin_of_direntry(direntry, first_cluster_of_parent);
|
|
else if(is_dot)
|
|
set_begin_of_direntry(direntry, first_cluster);
|
|
else
|
|
direntry->begin=0; /* do that later */
|
|
if (st.st_size > 0x7fffffff) {
|
|
fprintf(stderr, "File %s is larger than 2GB\n", buffer);
|
|
g_free(buffer);
|
|
closedir(dir);
|
|
return -2;
|
|
}
|
|
direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size);
|
|
|
|
/* create mapping for this file */
|
|
if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) {
|
|
s->current_mapping = array_get_next(&(s->mapping));
|
|
s->current_mapping->begin=0;
|
|
s->current_mapping->end=st.st_size;
|
|
/*
|
|
* we get the direntry of the most recent direntry, which
|
|
* contains the short name and all the relevant information.
|
|
*/
|
|
s->current_mapping->dir_index=s->directory.next-1;
|
|
s->current_mapping->first_mapping_index = -1;
|
|
if (S_ISDIR(st.st_mode)) {
|
|
s->current_mapping->mode = MODE_DIRECTORY;
|
|
s->current_mapping->info.dir.parent_mapping_index =
|
|
mapping_index;
|
|
} else {
|
|
s->current_mapping->mode = MODE_UNDEFINED;
|
|
s->current_mapping->info.file.offset = 0;
|
|
}
|
|
s->current_mapping->path=buffer;
|
|
s->current_mapping->read_only =
|
|
(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
|
|
} else {
|
|
g_free(buffer);
|
|
}
|
|
}
|
|
closedir(dir);
|
|
|
|
/* fill with zeroes up to the end of the cluster */
|
|
while(s->directory.next%(0x10*s->sectors_per_cluster)) {
|
|
direntry_t* direntry=array_get_next(&(s->directory));
|
|
memset(direntry,0,sizeof(direntry_t));
|
|
}
|
|
|
|
if (s->fat_type != 32 &&
|
|
mapping_index == 0 &&
|
|
s->directory.next < s->root_entries) {
|
|
/* root directory */
|
|
int cur = s->directory.next;
|
|
array_ensure_allocated(&(s->directory), s->root_entries - 1);
|
|
s->directory.next = s->root_entries;
|
|
memset(array_get(&(s->directory), cur), 0,
|
|
(s->root_entries - cur) * sizeof(direntry_t));
|
|
}
|
|
|
|
/* re-get the mapping, since s->mapping was possibly realloc()ed */
|
|
mapping = array_get(&(s->mapping), mapping_index);
|
|
first_cluster += (s->directory.next - mapping->info.dir.first_dir_index)
|
|
* 0x20 / s->cluster_size;
|
|
mapping->end = first_cluster;
|
|
|
|
direntry = array_get(&(s->directory), mapping->dir_index);
|
|
set_begin_of_direntry(direntry, mapping->begin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
|
|
{
|
|
return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
|
|
}
|
|
|
|
static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
|
|
{
|
|
return s->offset_to_root_dir + s->sectors_per_cluster * cluster_num;
|
|
}
|
|
|
|
static int init_directories(BDRVVVFATState* s,
|
|
const char *dirname, int heads, int secs,
|
|
Error **errp)
|
|
{
|
|
bootsector_t* bootsector;
|
|
mapping_t* mapping;
|
|
unsigned int i;
|
|
unsigned int cluster;
|
|
|
|
memset(&(s->first_sectors[0]),0,0x40*0x200);
|
|
|
|
s->cluster_size=s->sectors_per_cluster*0x200;
|
|
s->cluster_buffer=g_malloc(s->cluster_size);
|
|
|
|
/*
|
|
* The formula: sc = spf+1+spf*spc*(512*8/fat_type),
|
|
* where sc is sector_count,
|
|
* spf is sectors_per_fat,
|
|
* spc is sectors_per_clusters, and
|
|
* fat_type = 12, 16 or 32.
|
|
*/
|
|
i = 1+s->sectors_per_cluster*0x200*8/s->fat_type;
|
|
s->sectors_per_fat=(s->sector_count+i)/i; /* round up */
|
|
|
|
s->offset_to_fat = s->offset_to_bootsector + 1;
|
|
s->offset_to_root_dir = s->offset_to_fat + s->sectors_per_fat * 2;
|
|
|
|
array_init(&(s->mapping),sizeof(mapping_t));
|
|
array_init(&(s->directory),sizeof(direntry_t));
|
|
|
|
/* add volume label */
|
|
{
|
|
direntry_t* entry=array_get_next(&(s->directory));
|
|
entry->attributes=0x28; /* archive | volume label */
|
|
memcpy(entry->name, s->volume_label, sizeof(entry->name));
|
|
}
|
|
|
|
/* Now build FAT, and write back information into directory */
|
|
init_fat(s);
|
|
|
|
/* TODO: if there are more entries, bootsector has to be adjusted! */
|
|
s->root_entries = 0x02 * 0x10 * s->sectors_per_cluster;
|
|
s->cluster_count=sector2cluster(s, s->sector_count);
|
|
|
|
mapping = array_get_next(&(s->mapping));
|
|
mapping->begin = 0;
|
|
mapping->dir_index = 0;
|
|
mapping->info.dir.parent_mapping_index = -1;
|
|
mapping->first_mapping_index = -1;
|
|
mapping->path = g_strdup(dirname);
|
|
i = strlen(mapping->path);
|
|
if (i > 0 && mapping->path[i - 1] == '/')
|
|
mapping->path[i - 1] = '\0';
|
|
mapping->mode = MODE_DIRECTORY;
|
|
mapping->read_only = 0;
|
|
s->path = mapping->path;
|
|
|
|
for (i = 0, cluster = 0; i < s->mapping.next; i++) {
|
|
/* MS-DOS expects the FAT to be 0 for the root directory
|
|
* (except for the media byte). */
|
|
/* LATER TODO: still true for FAT32? */
|
|
int fix_fat = (i != 0);
|
|
mapping = array_get(&(s->mapping), i);
|
|
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
mapping->begin = cluster;
|
|
if(read_directory(s, i)) {
|
|
error_setg(errp, "Could not read directory %s",
|
|
mapping->path);
|
|
return -1;
|
|
}
|
|
mapping = array_get(&(s->mapping), i);
|
|
} else {
|
|
assert(mapping->mode == MODE_UNDEFINED);
|
|
mapping->mode=MODE_NORMAL;
|
|
mapping->begin = cluster;
|
|
if (mapping->end > 0) {
|
|
direntry_t* direntry = array_get(&(s->directory),
|
|
mapping->dir_index);
|
|
|
|
mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size;
|
|
set_begin_of_direntry(direntry, mapping->begin);
|
|
} else {
|
|
mapping->end = cluster + 1;
|
|
fix_fat = 0;
|
|
}
|
|
}
|
|
|
|
assert(mapping->begin < mapping->end);
|
|
|
|
/* next free cluster */
|
|
cluster = mapping->end;
|
|
|
|
if(cluster > s->cluster_count) {
|
|
error_setg(errp,
|
|
"Directory does not fit in FAT%d (capacity %.2f MB)",
|
|
s->fat_type, s->sector_count / 2000.0);
|
|
return -1;
|
|
}
|
|
|
|
/* fix fat for entry */
|
|
if (fix_fat) {
|
|
int j;
|
|
for(j = mapping->begin; j < mapping->end - 1; j++)
|
|
fat_set(s, j, j+1);
|
|
fat_set(s, mapping->end - 1, s->max_fat_value);
|
|
}
|
|
}
|
|
|
|
mapping = array_get(&(s->mapping), 0);
|
|
s->last_cluster_of_root_directory = mapping->end;
|
|
|
|
/* the FAT signature */
|
|
fat_set(s,0,s->max_fat_value);
|
|
fat_set(s,1,s->max_fat_value);
|
|
|
|
s->current_mapping = NULL;
|
|
|
|
bootsector = (bootsector_t *)(s->first_sectors
|
|
+ s->offset_to_bootsector * 0x200);
|
|
bootsector->jump[0]=0xeb;
|
|
bootsector->jump[1]=0x3e;
|
|
bootsector->jump[2]=0x90;
|
|
memcpy(bootsector->name, BOOTSECTOR_OEM_NAME, 8);
|
|
bootsector->sector_size=cpu_to_le16(0x200);
|
|
bootsector->sectors_per_cluster=s->sectors_per_cluster;
|
|
bootsector->reserved_sectors=cpu_to_le16(1);
|
|
bootsector->number_of_fats=0x2; /* number of FATs */
|
|
bootsector->root_entries = cpu_to_le16(s->root_entries);
|
|
bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
|
|
/* media descriptor: hard disk=0xf8, floppy=0xf0 */
|
|
bootsector->media_type = (s->offset_to_bootsector > 0 ? 0xf8 : 0xf0);
|
|
s->fat.pointer[0] = bootsector->media_type;
|
|
bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat);
|
|
bootsector->sectors_per_track = cpu_to_le16(secs);
|
|
bootsector->number_of_heads = cpu_to_le16(heads);
|
|
bootsector->hidden_sectors = cpu_to_le32(s->offset_to_bootsector);
|
|
bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
|
|
|
|
/* LATER TODO: if FAT32, this is wrong */
|
|
/* drive_number: fda=0, hda=0x80 */
|
|
bootsector->u.fat16.drive_number = s->offset_to_bootsector == 0 ? 0 : 0x80;
|
|
bootsector->u.fat16.signature=0x29;
|
|
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
|
|
|
|
memcpy(bootsector->u.fat16.volume_label, s->volume_label,
|
|
sizeof(bootsector->u.fat16.volume_label));
|
|
memcpy(bootsector->u.fat16.fat_type,
|
|
s->fat_type == 12 ? "FAT12 " : "FAT16 ", 8);
|
|
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static BDRVVVFATState *vvv = NULL;
|
|
#endif
|
|
|
|
static int enable_write_target(BlockDriverState *bs, Error **errp);
|
|
static int is_consistent(BDRVVVFATState *s);
|
|
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "vvfat",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "dir",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Host directory to map to the vvfat device",
|
|
},
|
|
{
|
|
.name = "fat-type",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "FAT type (12, 16 or 32)",
|
|
},
|
|
{
|
|
.name = "floppy",
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "Create a floppy rather than a hard disk image",
|
|
},
|
|
{
|
|
.name = "label",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Use a volume label other than QEMU VVFAT",
|
|
},
|
|
{
|
|
.name = "rw",
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "Make the image writable",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static void vvfat_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
int fat_type = 0;
|
|
bool floppy = false;
|
|
bool rw = false;
|
|
int i;
|
|
|
|
if (!strstart(filename, "fat:", NULL)) {
|
|
error_setg(errp, "File name string must start with 'fat:'");
|
|
return;
|
|
}
|
|
|
|
/* Parse options */
|
|
if (strstr(filename, ":32:")) {
|
|
fat_type = 32;
|
|
} else if (strstr(filename, ":16:")) {
|
|
fat_type = 16;
|
|
} else if (strstr(filename, ":12:")) {
|
|
fat_type = 12;
|
|
}
|
|
|
|
if (strstr(filename, ":floppy:")) {
|
|
floppy = true;
|
|
}
|
|
|
|
if (strstr(filename, ":rw:")) {
|
|
rw = true;
|
|
}
|
|
|
|
/* Get the directory name without options */
|
|
i = strrchr(filename, ':') - filename;
|
|
assert(i >= 3);
|
|
if (filename[i - 2] == ':' && qemu_isalpha(filename[i - 1])) {
|
|
/* workaround for DOS drive names */
|
|
filename += i - 1;
|
|
} else {
|
|
filename += i + 1;
|
|
}
|
|
|
|
/* Fill in the options QDict */
|
|
qdict_put_str(options, "dir", filename);
|
|
qdict_put_int(options, "fat-type", fat_type);
|
|
qdict_put_bool(options, "floppy", floppy);
|
|
qdict_put_bool(options, "rw", rw);
|
|
}
|
|
|
|
static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
int cyls, heads, secs;
|
|
bool floppy;
|
|
const char *dirname, *label;
|
|
QemuOpts *opts;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
#ifdef DEBUG
|
|
vvv = s;
|
|
#endif
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
dirname = qemu_opt_get(opts, "dir");
|
|
if (!dirname) {
|
|
error_setg(errp, "vvfat block driver requires a 'dir' option");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
|
|
floppy = qemu_opt_get_bool(opts, "floppy", false);
|
|
|
|
memset(s->volume_label, ' ', sizeof(s->volume_label));
|
|
label = qemu_opt_get(opts, "label");
|
|
if (label) {
|
|
size_t label_length = strlen(label);
|
|
if (label_length > 11) {
|
|
error_setg(errp, "vvfat label cannot be longer than 11 bytes");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
memcpy(s->volume_label, label, label_length);
|
|
} else {
|
|
memcpy(s->volume_label, "QEMU VVFAT", 10);
|
|
}
|
|
|
|
if (floppy) {
|
|
/* 1.44MB or 2.88MB floppy. 2.88MB can be FAT12 (default) or FAT16. */
|
|
if (!s->fat_type) {
|
|
s->fat_type = 12;
|
|
secs = 36;
|
|
s->sectors_per_cluster = 2;
|
|
} else {
|
|
secs = s->fat_type == 12 ? 18 : 36;
|
|
s->sectors_per_cluster = 1;
|
|
}
|
|
cyls = 80;
|
|
heads = 2;
|
|
} else {
|
|
/* 32MB or 504MB disk*/
|
|
if (!s->fat_type) {
|
|
s->fat_type = 16;
|
|
}
|
|
s->offset_to_bootsector = 0x3f;
|
|
cyls = s->fat_type == 12 ? 64 : 1024;
|
|
heads = 16;
|
|
secs = 63;
|
|
}
|
|
|
|
switch (s->fat_type) {
|
|
case 32:
|
|
warn_report("FAT32 has not been tested. You are welcome to do so!");
|
|
break;
|
|
case 16:
|
|
case 12:
|
|
break;
|
|
default:
|
|
error_setg(errp, "Valid FAT types are only 12, 16 and 32");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
|
|
s->bs = bs;
|
|
|
|
/* LATER TODO: if FAT32, adjust */
|
|
s->sectors_per_cluster=0x10;
|
|
|
|
s->current_cluster=0xffffffff;
|
|
|
|
s->qcow = NULL;
|
|
s->qcow_filename = NULL;
|
|
s->fat2 = NULL;
|
|
s->downcase_short_names = 1;
|
|
|
|
fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
|
|
dirname, cyls, heads, secs);
|
|
|
|
s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
|
|
|
|
if (qemu_opt_get_bool(opts, "rw", false)) {
|
|
if (!bdrv_is_read_only(bs)) {
|
|
ret = enable_write_target(bs, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
} else {
|
|
ret = -EPERM;
|
|
error_setg(errp,
|
|
"Unable to set VVFAT to 'rw' when drive is read-only");
|
|
goto fail;
|
|
}
|
|
} else if (!bdrv_is_read_only(bs)) {
|
|
error_report("Opening non-rw vvfat images without an explicit "
|
|
"read-only=on option is deprecated. Future versions "
|
|
"will refuse to open the image instead of "
|
|
"automatically marking the image read-only.");
|
|
/* read only is the default for safety */
|
|
ret = bdrv_set_read_only(bs, true, &local_err);
|
|
if (ret < 0) {
|
|
error_propagate(errp, local_err);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
bs->total_sectors = cyls * heads * secs;
|
|
|
|
if (init_directories(s, dirname, heads, secs, errp)) {
|
|
ret = -EIO;
|
|
goto fail;
|
|
}
|
|
|
|
s->sector_count = s->offset_to_root_dir
|
|
+ s->sectors_per_cluster * s->cluster_count;
|
|
|
|
/* Disable migration when vvfat is used rw */
|
|
if (s->qcow) {
|
|
error_setg(&s->migration_blocker,
|
|
"The vvfat (rw) format used by node '%s' "
|
|
"does not support live migration",
|
|
bdrv_get_device_or_node_name(bs));
|
|
ret = migrate_add_blocker(s->migration_blocker, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
error_free(s->migration_blocker);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (s->offset_to_bootsector > 0) {
|
|
init_mbr(s, cyls, heads, secs);
|
|
}
|
|
|
|
qemu_co_mutex_init(&s->lock);
|
|
|
|
ret = 0;
|
|
fail:
|
|
qemu_opts_del(opts);
|
|
return ret;
|
|
}
|
|
|
|
static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
|
|
{
|
|
bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
|
|
}
|
|
|
|
static inline void vvfat_close_current_file(BDRVVVFATState *s)
|
|
{
|
|
if(s->current_mapping) {
|
|
s->current_mapping = NULL;
|
|
if (s->current_fd) {
|
|
qemu_close(s->current_fd);
|
|
s->current_fd = 0;
|
|
}
|
|
}
|
|
s->current_cluster = -1;
|
|
}
|
|
|
|
/* mappings between index1 and index2-1 are supposed to be ordered
|
|
* return value is the index of the last mapping for which end>cluster_num
|
|
*/
|
|
static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2)
|
|
{
|
|
while(1) {
|
|
int index3;
|
|
mapping_t* mapping;
|
|
index3=(index1+index2)/2;
|
|
mapping=array_get(&(s->mapping),index3);
|
|
assert(mapping->begin < mapping->end);
|
|
if(mapping->begin>=cluster_num) {
|
|
assert(index2!=index3 || index2==0);
|
|
if(index2==index3)
|
|
return index1;
|
|
index2=index3;
|
|
} else {
|
|
if(index1==index3)
|
|
return mapping->end<=cluster_num ? index2 : index1;
|
|
index1=index3;
|
|
}
|
|
assert(index1<=index2);
|
|
DLOG(mapping=array_get(&(s->mapping),index1);
|
|
assert(mapping->begin<=cluster_num);
|
|
assert(index2 >= s->mapping.next ||
|
|
((mapping = array_get(&(s->mapping),index2)) &&
|
|
mapping->end>cluster_num)));
|
|
}
|
|
}
|
|
|
|
static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num)
|
|
{
|
|
int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next);
|
|
mapping_t* mapping;
|
|
if(index>=s->mapping.next)
|
|
return NULL;
|
|
mapping=array_get(&(s->mapping),index);
|
|
if(mapping->begin>cluster_num)
|
|
return NULL;
|
|
assert(mapping->begin<=cluster_num && mapping->end>cluster_num);
|
|
return mapping;
|
|
}
|
|
|
|
static int open_file(BDRVVVFATState* s,mapping_t* mapping)
|
|
{
|
|
if(!mapping)
|
|
return -1;
|
|
if(!s->current_mapping ||
|
|
strcmp(s->current_mapping->path,mapping->path)) {
|
|
/* open file */
|
|
int fd = qemu_open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE);
|
|
if(fd<0)
|
|
return -1;
|
|
vvfat_close_current_file(s);
|
|
s->current_fd = fd;
|
|
s->current_mapping = mapping;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int read_cluster(BDRVVVFATState *s,int cluster_num)
|
|
{
|
|
if(s->current_cluster != cluster_num) {
|
|
int result=0;
|
|
off_t offset;
|
|
assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY));
|
|
if(!s->current_mapping
|
|
|| s->current_mapping->begin>cluster_num
|
|
|| s->current_mapping->end<=cluster_num) {
|
|
/* binary search of mappings for file */
|
|
mapping_t* mapping=find_mapping_for_cluster(s,cluster_num);
|
|
|
|
assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end));
|
|
|
|
if (mapping && mapping->mode & MODE_DIRECTORY) {
|
|
vvfat_close_current_file(s);
|
|
s->current_mapping = mapping;
|
|
read_cluster_directory:
|
|
offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
|
|
s->cluster = (unsigned char*)s->directory.pointer+offset
|
|
+ 0x20*s->current_mapping->info.dir.first_dir_index;
|
|
assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
|
|
assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);
|
|
s->current_cluster = cluster_num;
|
|
return 0;
|
|
}
|
|
|
|
if(open_file(s,mapping))
|
|
return -2;
|
|
} else if (s->current_mapping->mode & MODE_DIRECTORY)
|
|
goto read_cluster_directory;
|
|
|
|
assert(s->current_fd);
|
|
|
|
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
|
|
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
|
|
return -3;
|
|
s->cluster=s->cluster_buffer;
|
|
result=read(s->current_fd,s->cluster,s->cluster_size);
|
|
if(result<0) {
|
|
s->current_cluster = -1;
|
|
return -1;
|
|
}
|
|
s->current_cluster = cluster_num;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void print_direntry(const direntry_t* direntry)
|
|
{
|
|
int j = 0;
|
|
char buffer[1024];
|
|
|
|
fprintf(stderr, "direntry %p: ", direntry);
|
|
if(!direntry)
|
|
return;
|
|
if(is_long_name(direntry)) {
|
|
unsigned char* c=(unsigned char*)direntry;
|
|
int i;
|
|
for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2)
|
|
#define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = 0xb0; j++;}
|
|
ADD_CHAR(c[i]);
|
|
for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2)
|
|
ADD_CHAR(c[i]);
|
|
for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2)
|
|
ADD_CHAR(c[i]);
|
|
buffer[j] = 0;
|
|
fprintf(stderr, "%s\n", buffer);
|
|
} else {
|
|
int i;
|
|
for(i=0;i<11;i++)
|
|
ADD_CHAR(direntry->name[i]);
|
|
buffer[j] = 0;
|
|
fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n",
|
|
buffer,
|
|
direntry->attributes,
|
|
begin_of_direntry(direntry),le32_to_cpu(direntry->size));
|
|
}
|
|
}
|
|
|
|
static void print_mapping(const mapping_t* mapping)
|
|
{
|
|
fprintf(stderr, "mapping (%p): begin, end = %d, %d, dir_index = %d, "
|
|
"first_mapping_index = %d, name = %s, mode = 0x%x, " ,
|
|
mapping, mapping->begin, mapping->end, mapping->dir_index,
|
|
mapping->first_mapping_index, mapping->path, mapping->mode);
|
|
|
|
if (mapping->mode & MODE_DIRECTORY)
|
|
fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index);
|
|
else
|
|
fprintf(stderr, "offset = %d\n", mapping->info.file.offset);
|
|
}
|
|
#endif
|
|
|
|
static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
int i;
|
|
|
|
for(i=0;i<nb_sectors;i++,sector_num++) {
|
|
if (sector_num >= bs->total_sectors)
|
|
return -1;
|
|
if (s->qcow) {
|
|
int64_t n;
|
|
int ret;
|
|
ret = bdrv_is_allocated(s->qcow->bs, sector_num * BDRV_SECTOR_SIZE,
|
|
(nb_sectors - i) * BDRV_SECTOR_SIZE, &n);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
if (ret) {
|
|
DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
|
|
" allocated\n", sector_num,
|
|
n >> BDRV_SECTOR_BITS));
|
|
if (bdrv_read(s->qcow, sector_num, buf + i * 0x200,
|
|
n >> BDRV_SECTOR_BITS)) {
|
|
return -1;
|
|
}
|
|
i += (n >> BDRV_SECTOR_BITS) - 1;
|
|
sector_num += (n >> BDRV_SECTOR_BITS) - 1;
|
|
continue;
|
|
}
|
|
DLOG(fprintf(stderr, "sector %" PRId64 " not allocated\n",
|
|
sector_num));
|
|
}
|
|
if (sector_num < s->offset_to_root_dir) {
|
|
if (sector_num < s->offset_to_fat) {
|
|
memcpy(buf + i * 0x200,
|
|
&(s->first_sectors[sector_num * 0x200]),
|
|
0x200);
|
|
} else if (sector_num < s->offset_to_fat + s->sectors_per_fat) {
|
|
memcpy(buf + i * 0x200,
|
|
&(s->fat.pointer[(sector_num
|
|
- s->offset_to_fat) * 0x200]),
|
|
0x200);
|
|
} else if (sector_num < s->offset_to_root_dir) {
|
|
memcpy(buf + i * 0x200,
|
|
&(s->fat.pointer[(sector_num - s->offset_to_fat
|
|
- s->sectors_per_fat) * 0x200]),
|
|
0x200);
|
|
}
|
|
} else {
|
|
uint32_t sector = sector_num - s->offset_to_root_dir,
|
|
sector_offset_in_cluster=(sector%s->sectors_per_cluster),
|
|
cluster_num=sector/s->sectors_per_cluster;
|
|
if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
|
|
/* LATER TODO: strict: return -1; */
|
|
memset(buf+i*0x200,0,0x200);
|
|
continue;
|
|
}
|
|
memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
vvfat_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int flags)
|
|
{
|
|
int ret;
|
|
BDRVVVFATState *s = bs->opaque;
|
|
uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
|
|
int nb_sectors = bytes >> BDRV_SECTOR_BITS;
|
|
void *buf;
|
|
|
|
assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
|
|
buf = g_try_malloc(bytes);
|
|
if (bytes && buf == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
ret = vvfat_read(bs, sector_num, buf, nb_sectors);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
|
|
qemu_iovec_from_buf(qiov, 0, buf, bytes);
|
|
g_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* LATER TODO: statify all functions */
|
|
|
|
/*
|
|
* Idea of the write support (use snapshot):
|
|
*
|
|
* 1. check if all data is consistent, recording renames, modifications,
|
|
* new files and directories (in s->commits).
|
|
*
|
|
* 2. if the data is not consistent, stop committing
|
|
*
|
|
* 3. handle renames, and create new files and directories (do not yet
|
|
* write their contents)
|
|
*
|
|
* 4. walk the directories, fixing the mapping and direntries, and marking
|
|
* the handled mappings as not deleted
|
|
*
|
|
* 5. commit the contents of the files
|
|
*
|
|
* 6. handle deleted files and directories
|
|
*
|
|
*/
|
|
|
|
typedef struct commit_t {
|
|
char* path;
|
|
union {
|
|
struct { uint32_t cluster; } rename;
|
|
struct { int dir_index; uint32_t modified_offset; } writeout;
|
|
struct { uint32_t first_cluster; } new_file;
|
|
struct { uint32_t cluster; } mkdir;
|
|
} param;
|
|
/* DELETEs and RMDIRs are handled differently: see handle_deletes() */
|
|
enum {
|
|
ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR
|
|
} action;
|
|
} commit_t;
|
|
|
|
static void clear_commits(BDRVVVFATState* s)
|
|
{
|
|
int i;
|
|
DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next));
|
|
for (i = 0; i < s->commits.next; i++) {
|
|
commit_t* commit = array_get(&(s->commits), i);
|
|
assert(commit->path || commit->action == ACTION_WRITEOUT);
|
|
if (commit->action != ACTION_WRITEOUT) {
|
|
assert(commit->path);
|
|
g_free(commit->path);
|
|
} else
|
|
assert(commit->path == NULL);
|
|
}
|
|
s->commits.next = 0;
|
|
}
|
|
|
|
static void schedule_rename(BDRVVVFATState* s,
|
|
uint32_t cluster, char* new_path)
|
|
{
|
|
commit_t* commit = array_get_next(&(s->commits));
|
|
commit->path = new_path;
|
|
commit->param.rename.cluster = cluster;
|
|
commit->action = ACTION_RENAME;
|
|
}
|
|
|
|
static void schedule_writeout(BDRVVVFATState* s,
|
|
int dir_index, uint32_t modified_offset)
|
|
{
|
|
commit_t* commit = array_get_next(&(s->commits));
|
|
commit->path = NULL;
|
|
commit->param.writeout.dir_index = dir_index;
|
|
commit->param.writeout.modified_offset = modified_offset;
|
|
commit->action = ACTION_WRITEOUT;
|
|
}
|
|
|
|
static void schedule_new_file(BDRVVVFATState* s,
|
|
char* path, uint32_t first_cluster)
|
|
{
|
|
commit_t* commit = array_get_next(&(s->commits));
|
|
commit->path = path;
|
|
commit->param.new_file.first_cluster = first_cluster;
|
|
commit->action = ACTION_NEW_FILE;
|
|
}
|
|
|
|
static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path)
|
|
{
|
|
commit_t* commit = array_get_next(&(s->commits));
|
|
commit->path = path;
|
|
commit->param.mkdir.cluster = cluster;
|
|
commit->action = ACTION_MKDIR;
|
|
}
|
|
|
|
typedef struct {
|
|
/*
|
|
* Since the sequence number is at most 0x3f, and the filename
|
|
* length is at most 13 times the sequence number, the maximal
|
|
* filename length is 0x3f * 13 bytes.
|
|
*/
|
|
unsigned char name[0x3f * 13 + 1];
|
|
gunichar2 name2[0x3f * 13 + 1];
|
|
int checksum, len;
|
|
int sequence_number;
|
|
} long_file_name;
|
|
|
|
static void lfn_init(long_file_name* lfn)
|
|
{
|
|
lfn->sequence_number = lfn->len = 0;
|
|
lfn->checksum = 0x100;
|
|
}
|
|
|
|
/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
|
|
static int parse_long_name(long_file_name* lfn,
|
|
const direntry_t* direntry)
|
|
{
|
|
int i, j, offset;
|
|
const unsigned char* pointer = (const unsigned char*)direntry;
|
|
|
|
if (!is_long_name(direntry))
|
|
return 1;
|
|
|
|
if (pointer[0] & 0x40) {
|
|
/* first entry; do some initialization */
|
|
lfn->sequence_number = pointer[0] & 0x3f;
|
|
lfn->checksum = pointer[13];
|
|
lfn->name[0] = 0;
|
|
lfn->name[lfn->sequence_number * 13] = 0;
|
|
} else if ((pointer[0] & 0x3f) != --lfn->sequence_number) {
|
|
/* not the expected sequence number */
|
|
return -1;
|
|
} else if (pointer[13] != lfn->checksum) {
|
|
/* not the expected checksum */
|
|
return -2;
|
|
} else if (pointer[12] || pointer[26] || pointer[27]) {
|
|
/* invalid zero fields */
|
|
return -3;
|
|
}
|
|
|
|
offset = 13 * (lfn->sequence_number - 1);
|
|
for (i = 0, j = 1; i < 13; i++, j+=2) {
|
|
if (j == 11)
|
|
j = 14;
|
|
else if (j == 26)
|
|
j = 28;
|
|
|
|
if (pointer[j] == 0 && pointer[j + 1] == 0) {
|
|
/* end of long file name */
|
|
break;
|
|
}
|
|
gunichar2 c = (pointer[j + 1] << 8) + pointer[j];
|
|
lfn->name2[offset + i] = c;
|
|
}
|
|
|
|
if (pointer[0] & 0x40) {
|
|
/* first entry; set len */
|
|
lfn->len = offset + i;
|
|
}
|
|
if ((pointer[0] & 0x3f) == 0x01) {
|
|
/* last entry; finalize entry */
|
|
glong olen;
|
|
gchar *utf8 = g_utf16_to_utf8(lfn->name2, lfn->len, NULL, &olen, NULL);
|
|
if (!utf8) {
|
|
return -4;
|
|
}
|
|
lfn->len = olen;
|
|
memcpy(lfn->name, utf8, olen + 1);
|
|
g_free(utf8);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* returns 0 if successful, >0 if no short_name, and <0 on error */
|
|
static int parse_short_name(BDRVVVFATState* s,
|
|
long_file_name* lfn, direntry_t* direntry)
|
|
{
|
|
int i, j;
|
|
|
|
if (!is_short_name(direntry))
|
|
return 1;
|
|
|
|
for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
|
|
for (i = 0; i <= j; i++) {
|
|
uint8_t c = direntry->name[i];
|
|
if (c != to_valid_short_char(c)) {
|
|
return -1;
|
|
} else if (s->downcase_short_names) {
|
|
lfn->name[i] = qemu_tolower(direntry->name[i]);
|
|
} else {
|
|
lfn->name[i] = direntry->name[i];
|
|
}
|
|
}
|
|
|
|
for (j = 2; j >= 0 && direntry->name[8 + j] == ' '; j--) {
|
|
}
|
|
if (j >= 0) {
|
|
lfn->name[i++] = '.';
|
|
lfn->name[i + j + 1] = '\0';
|
|
for (;j >= 0; j--) {
|
|
uint8_t c = direntry->name[8 + j];
|
|
if (c != to_valid_short_char(c)) {
|
|
return -2;
|
|
} else if (s->downcase_short_names) {
|
|
lfn->name[i + j] = qemu_tolower(c);
|
|
} else {
|
|
lfn->name[i + j] = c;
|
|
}
|
|
}
|
|
} else
|
|
lfn->name[i + j + 1] = '\0';
|
|
|
|
if (lfn->name[0] == DIR_KANJI_FAKE) {
|
|
lfn->name[0] = DIR_KANJI;
|
|
}
|
|
lfn->len = strlen((char*)lfn->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline uint32_t modified_fat_get(BDRVVVFATState* s,
|
|
unsigned int cluster)
|
|
{
|
|
if (cluster < s->last_cluster_of_root_directory) {
|
|
if (cluster + 1 == s->last_cluster_of_root_directory)
|
|
return s->max_fat_value;
|
|
else
|
|
return cluster + 1;
|
|
}
|
|
|
|
if (s->fat_type==32) {
|
|
uint32_t* entry=((uint32_t*)s->fat2)+cluster;
|
|
return le32_to_cpu(*entry);
|
|
} else if (s->fat_type==16) {
|
|
uint16_t* entry=((uint16_t*)s->fat2)+cluster;
|
|
return le16_to_cpu(*entry);
|
|
} else {
|
|
const uint8_t* x=s->fat2+cluster*3/2;
|
|
return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
|
|
}
|
|
}
|
|
|
|
static inline bool cluster_was_modified(BDRVVVFATState *s,
|
|
uint32_t cluster_num)
|
|
{
|
|
int was_modified = 0;
|
|
int i;
|
|
|
|
if (s->qcow == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
|
|
was_modified = bdrv_is_allocated(s->qcow->bs,
|
|
(cluster2sector(s, cluster_num) +
|
|
i) * BDRV_SECTOR_SIZE,
|
|
BDRV_SECTOR_SIZE, NULL);
|
|
}
|
|
|
|
/*
|
|
* Note that this treats failures to learn allocation status the
|
|
* same as if an allocation has occurred. It's as safe as
|
|
* anything else, given that a failure to learn allocation status
|
|
* will probably result in more failures.
|
|
*/
|
|
return !!was_modified;
|
|
}
|
|
|
|
static const char* get_basename(const char* path)
|
|
{
|
|
char* basename = strrchr(path, '/');
|
|
if (basename == NULL)
|
|
return path;
|
|
else
|
|
return basename + 1; /* strip '/' */
|
|
}
|
|
|
|
/*
|
|
* The array s->used_clusters holds the states of the clusters. If it is
|
|
* part of a file, it has bit 2 set, in case of a directory, bit 1. If it
|
|
* was modified, bit 3 is set.
|
|
* If any cluster is allocated, but not part of a file or directory, this
|
|
* driver refuses to commit.
|
|
*/
|
|
typedef enum {
|
|
USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
|
|
} used_t;
|
|
|
|
/*
|
|
* get_cluster_count_for_direntry() not only determines how many clusters
|
|
* are occupied by direntry, but also if it was renamed or modified.
|
|
*
|
|
* A file is thought to be renamed *only* if there already was a file with
|
|
* exactly the same first cluster, but a different name.
|
|
*
|
|
* Further, the files/directories handled by this function are
|
|
* assumed to be *not* deleted (and *only* those).
|
|
*/
|
|
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
|
|
direntry_t* direntry, const char* path)
|
|
{
|
|
/*
|
|
* This is a little bit tricky:
|
|
* IF the guest OS just inserts a cluster into the file chain,
|
|
* and leaves the rest alone, (i.e. the original file had clusters
|
|
* 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
|
|
*
|
|
* - do_commit will write the cluster into the file at the given
|
|
* offset, but
|
|
*
|
|
* - the cluster which is overwritten should be moved to a later
|
|
* position in the file.
|
|
*
|
|
* I am not aware that any OS does something as braindead, but this
|
|
* situation could happen anyway when not committing for a long time.
|
|
* Just to be sure that this does not bite us, detect it, and copy the
|
|
* contents of the clusters to-be-overwritten into the qcow.
|
|
*/
|
|
int copy_it = 0;
|
|
int was_modified = 0;
|
|
int32_t ret = 0;
|
|
|
|
uint32_t cluster_num = begin_of_direntry(direntry);
|
|
uint32_t offset = 0;
|
|
int first_mapping_index = -1;
|
|
mapping_t* mapping = NULL;
|
|
const char* basename2 = NULL;
|
|
|
|
vvfat_close_current_file(s);
|
|
|
|
/* the root directory */
|
|
if (cluster_num == 0)
|
|
return 0;
|
|
|
|
/* write support */
|
|
if (s->qcow) {
|
|
basename2 = get_basename(path);
|
|
|
|
mapping = find_mapping_for_cluster(s, cluster_num);
|
|
|
|
if (mapping) {
|
|
const char* basename;
|
|
|
|
assert(mapping->mode & MODE_DELETED);
|
|
mapping->mode &= ~MODE_DELETED;
|
|
|
|
basename = get_basename(mapping->path);
|
|
|
|
assert(mapping->mode & MODE_NORMAL);
|
|
|
|
/* rename */
|
|
if (strcmp(basename, basename2))
|
|
schedule_rename(s, cluster_num, g_strdup(path));
|
|
} else if (is_file(direntry))
|
|
/* new file */
|
|
schedule_new_file(s, g_strdup(path), cluster_num);
|
|
else {
|
|
abort();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
while(1) {
|
|
if (s->qcow) {
|
|
if (!copy_it && cluster_was_modified(s, cluster_num)) {
|
|
if (mapping == NULL ||
|
|
mapping->begin > cluster_num ||
|
|
mapping->end <= cluster_num)
|
|
mapping = find_mapping_for_cluster(s, cluster_num);
|
|
|
|
|
|
if (mapping &&
|
|
(mapping->mode & MODE_DIRECTORY) == 0) {
|
|
|
|
/* was modified in qcow */
|
|
if (offset != mapping->info.file.offset + s->cluster_size
|
|
* (cluster_num - mapping->begin)) {
|
|
/* offset of this cluster in file chain has changed */
|
|
abort();
|
|
copy_it = 1;
|
|
} else if (offset == 0) {
|
|
const char* basename = get_basename(mapping->path);
|
|
|
|
if (strcmp(basename, basename2))
|
|
copy_it = 1;
|
|
first_mapping_index = array_index(&(s->mapping), mapping);
|
|
}
|
|
|
|
if (mapping->first_mapping_index != first_mapping_index
|
|
&& mapping->info.file.offset > 0) {
|
|
abort();
|
|
copy_it = 1;
|
|
}
|
|
|
|
/* need to write out? */
|
|
if (!was_modified && is_file(direntry)) {
|
|
was_modified = 1;
|
|
schedule_writeout(s, mapping->dir_index, offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (copy_it) {
|
|
int i;
|
|
/*
|
|
* This is horribly inefficient, but that is okay, since
|
|
* it is rarely executed, if at all.
|
|
*/
|
|
int64_t offset = cluster2sector(s, cluster_num);
|
|
|
|
vvfat_close_current_file(s);
|
|
for (i = 0; i < s->sectors_per_cluster; i++) {
|
|
int res;
|
|
|
|
res = bdrv_is_allocated(s->qcow->bs,
|
|
(offset + i) * BDRV_SECTOR_SIZE,
|
|
BDRV_SECTOR_SIZE, NULL);
|
|
if (res < 0) {
|
|
return -1;
|
|
}
|
|
if (!res) {
|
|
res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
|
|
if (res) {
|
|
return -1;
|
|
}
|
|
res = bdrv_write(s->qcow, offset, s->cluster_buffer, 1);
|
|
if (res) {
|
|
return -2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ret++;
|
|
if (s->used_clusters[cluster_num] & USED_ANY)
|
|
return 0;
|
|
s->used_clusters[cluster_num] = USED_FILE;
|
|
|
|
cluster_num = modified_fat_get(s, cluster_num);
|
|
|
|
if (fat_eof(s, cluster_num))
|
|
return ret;
|
|
else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
|
|
return -1;
|
|
|
|
offset += s->cluster_size;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function looks at the modified data (qcow).
|
|
* It returns 0 upon inconsistency or error, and the number of clusters
|
|
* used by the directory, its subdirectories and their files.
|
|
*/
|
|
static int check_directory_consistency(BDRVVVFATState *s,
|
|
int cluster_num, const char* path)
|
|
{
|
|
int ret = 0;
|
|
unsigned char* cluster = g_malloc(s->cluster_size);
|
|
direntry_t* direntries = (direntry_t*)cluster;
|
|
mapping_t* mapping = find_mapping_for_cluster(s, cluster_num);
|
|
|
|
long_file_name lfn;
|
|
int path_len = strlen(path);
|
|
char path2[PATH_MAX + 1];
|
|
|
|
assert(path_len < PATH_MAX); /* len was tested before! */
|
|
pstrcpy(path2, sizeof(path2), path);
|
|
path2[path_len] = '/';
|
|
path2[path_len + 1] = '\0';
|
|
|
|
if (mapping) {
|
|
const char* basename = get_basename(mapping->path);
|
|
const char* basename2 = get_basename(path);
|
|
|
|
assert(mapping->mode & MODE_DIRECTORY);
|
|
|
|
assert(mapping->mode & MODE_DELETED);
|
|
mapping->mode &= ~MODE_DELETED;
|
|
|
|
if (strcmp(basename, basename2))
|
|
schedule_rename(s, cluster_num, g_strdup(path));
|
|
} else
|
|
/* new directory */
|
|
schedule_mkdir(s, cluster_num, g_strdup(path));
|
|
|
|
lfn_init(&lfn);
|
|
do {
|
|
int i;
|
|
int subret = 0;
|
|
|
|
ret++;
|
|
|
|
if (s->used_clusters[cluster_num] & USED_ANY) {
|
|
fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
|
|
goto fail;
|
|
}
|
|
s->used_clusters[cluster_num] = USED_DIRECTORY;
|
|
|
|
DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num)));
|
|
subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster,
|
|
s->sectors_per_cluster);
|
|
if (subret) {
|
|
fprintf(stderr, "Error fetching direntries\n");
|
|
fail:
|
|
g_free(cluster);
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) {
|
|
int cluster_count = 0;
|
|
|
|
DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i));
|
|
if (is_volume_label(direntries + i) || is_dot(direntries + i) ||
|
|
is_free(direntries + i))
|
|
continue;
|
|
|
|
subret = parse_long_name(&lfn, direntries + i);
|
|
if (subret < 0) {
|
|
fprintf(stderr, "Error in long name\n");
|
|
goto fail;
|
|
}
|
|
if (subret == 0 || is_free(direntries + i))
|
|
continue;
|
|
|
|
if (fat_chksum(direntries+i) != lfn.checksum) {
|
|
subret = parse_short_name(s, &lfn, direntries + i);
|
|
if (subret < 0) {
|
|
fprintf(stderr, "Error in short name (%d)\n", subret);
|
|
goto fail;
|
|
}
|
|
if (subret > 0 || !strcmp((char*)lfn.name, ".")
|
|
|| !strcmp((char*)lfn.name, ".."))
|
|
continue;
|
|
}
|
|
lfn.checksum = 0x100; /* cannot use long name twice */
|
|
|
|
if (path_len + 1 + lfn.len >= PATH_MAX) {
|
|
fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
|
|
goto fail;
|
|
}
|
|
pstrcpy(path2 + path_len + 1, sizeof(path2) - path_len - 1,
|
|
(char*)lfn.name);
|
|
|
|
if (is_directory(direntries + i)) {
|
|
if (begin_of_direntry(direntries + i) == 0) {
|
|
DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i));
|
|
goto fail;
|
|
}
|
|
cluster_count = check_directory_consistency(s,
|
|
begin_of_direntry(direntries + i), path2);
|
|
if (cluster_count == 0) {
|
|
DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i));
|
|
goto fail;
|
|
}
|
|
} else if (is_file(direntries + i)) {
|
|
/* check file size with FAT */
|
|
cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2);
|
|
if (cluster_count !=
|
|
DIV_ROUND_UP(le32_to_cpu(direntries[i].size), s->cluster_size)) {
|
|
DLOG(fprintf(stderr, "Cluster count mismatch\n"));
|
|
goto fail;
|
|
}
|
|
} else
|
|
abort(); /* cluster_count = 0; */
|
|
|
|
ret += cluster_count;
|
|
}
|
|
|
|
cluster_num = modified_fat_get(s, cluster_num);
|
|
} while(!fat_eof(s, cluster_num));
|
|
|
|
g_free(cluster);
|
|
return ret;
|
|
}
|
|
|
|
/* returns 1 on success */
|
|
static int is_consistent(BDRVVVFATState* s)
|
|
{
|
|
int i, check;
|
|
int used_clusters_count = 0;
|
|
|
|
DLOG(checkpoint());
|
|
/*
|
|
* - get modified FAT
|
|
* - compare the two FATs (TODO)
|
|
* - get buffer for marking used clusters
|
|
* - recurse direntries from root (using bs->bdrv_read to make
|
|
* sure to get the new data)
|
|
* - check that the FAT agrees with the size
|
|
* - count the number of clusters occupied by this directory and
|
|
* its files
|
|
* - check that the cumulative used cluster count agrees with the
|
|
* FAT
|
|
* - if all is fine, return number of used clusters
|
|
*/
|
|
if (s->fat2 == NULL) {
|
|
int size = 0x200 * s->sectors_per_fat;
|
|
s->fat2 = g_malloc(size);
|
|
memcpy(s->fat2, s->fat.pointer, size);
|
|
}
|
|
check = vvfat_read(s->bs,
|
|
s->offset_to_fat, s->fat2, s->sectors_per_fat);
|
|
if (check) {
|
|
fprintf(stderr, "Could not copy fat\n");
|
|
return 0;
|
|
}
|
|
assert (s->used_clusters);
|
|
for (i = 0; i < sector2cluster(s, s->sector_count); i++)
|
|
s->used_clusters[i] &= ~USED_ANY;
|
|
|
|
clear_commits(s);
|
|
|
|
/* mark every mapped file/directory as deleted.
|
|
* (check_directory_consistency() will unmark those still present). */
|
|
if (s->qcow)
|
|
for (i = 0; i < s->mapping.next; i++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), i);
|
|
if (mapping->first_mapping_index < 0)
|
|
mapping->mode |= MODE_DELETED;
|
|
}
|
|
|
|
used_clusters_count = check_directory_consistency(s, 0, s->path);
|
|
if (used_clusters_count <= 0) {
|
|
DLOG(fprintf(stderr, "problem in directory\n"));
|
|
return 0;
|
|
}
|
|
|
|
check = s->last_cluster_of_root_directory;
|
|
for (i = check; i < sector2cluster(s, s->sector_count); i++) {
|
|
if (modified_fat_get(s, i)) {
|
|
if(!s->used_clusters[i]) {
|
|
DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
|
|
return 0;
|
|
}
|
|
check++;
|
|
}
|
|
|
|
if (s->used_clusters[i] == USED_ALLOCATED) {
|
|
/* allocated, but not used... */
|
|
DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (check != used_clusters_count)
|
|
return 0;
|
|
|
|
return used_clusters_count;
|
|
}
|
|
|
|
static inline void adjust_mapping_indices(BDRVVVFATState* s,
|
|
int offset, int adjust)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < s->mapping.next; i++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), i);
|
|
|
|
#define ADJUST_MAPPING_INDEX(name) \
|
|
if (mapping->name >= offset) \
|
|
mapping->name += adjust
|
|
|
|
ADJUST_MAPPING_INDEX(first_mapping_index);
|
|
if (mapping->mode & MODE_DIRECTORY)
|
|
ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
|
|
}
|
|
}
|
|
|
|
/* insert or update mapping */
|
|
static mapping_t* insert_mapping(BDRVVVFATState* s,
|
|
uint32_t begin, uint32_t end)
|
|
{
|
|
/*
|
|
* - find mapping where mapping->begin >= begin,
|
|
* - if mapping->begin > begin: insert
|
|
* - adjust all references to mappings!
|
|
* - else: adjust
|
|
* - replace name
|
|
*/
|
|
int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
|
|
mapping_t* mapping = NULL;
|
|
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
|
|
|
if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
|
|
&& mapping->begin < begin) {
|
|
mapping->end = begin;
|
|
index++;
|
|
mapping = array_get(&(s->mapping), index);
|
|
}
|
|
if (index >= s->mapping.next || mapping->begin > begin) {
|
|
mapping = array_insert(&(s->mapping), index, 1);
|
|
mapping->path = NULL;
|
|
adjust_mapping_indices(s, index, +1);
|
|
}
|
|
|
|
mapping->begin = begin;
|
|
mapping->end = end;
|
|
|
|
DLOG(mapping_t* next_mapping;
|
|
assert(index + 1 >= s->mapping.next ||
|
|
((next_mapping = array_get(&(s->mapping), index + 1)) &&
|
|
next_mapping->begin >= end)));
|
|
|
|
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
|
s->current_mapping = array_get(&(s->mapping),
|
|
s->current_mapping - first_mapping);
|
|
|
|
return mapping;
|
|
}
|
|
|
|
static int remove_mapping(BDRVVVFATState* s, int mapping_index)
|
|
{
|
|
mapping_t* mapping = array_get(&(s->mapping), mapping_index);
|
|
mapping_t* first_mapping = array_get(&(s->mapping), 0);
|
|
|
|
/* free mapping */
|
|
if (mapping->first_mapping_index < 0) {
|
|
g_free(mapping->path);
|
|
}
|
|
|
|
/* remove from s->mapping */
|
|
array_remove(&(s->mapping), mapping_index);
|
|
|
|
/* adjust all references to mappings */
|
|
adjust_mapping_indices(s, mapping_index, -1);
|
|
|
|
if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
|
|
s->current_mapping = array_get(&(s->mapping),
|
|
s->current_mapping - first_mapping);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust)
|
|
{
|
|
int i;
|
|
for (i = 0; i < s->mapping.next; i++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), i);
|
|
if (mapping->dir_index >= offset)
|
|
mapping->dir_index += adjust;
|
|
if ((mapping->mode & MODE_DIRECTORY) &&
|
|
mapping->info.dir.first_dir_index >= offset)
|
|
mapping->info.dir.first_dir_index += adjust;
|
|
}
|
|
}
|
|
|
|
static direntry_t* insert_direntries(BDRVVVFATState* s,
|
|
int dir_index, int count)
|
|
{
|
|
/*
|
|
* make room in s->directory,
|
|
* adjust_dirindices
|
|
*/
|
|
direntry_t* result = array_insert(&(s->directory), dir_index, count);
|
|
if (result == NULL)
|
|
return NULL;
|
|
adjust_dirindices(s, dir_index, count);
|
|
return result;
|
|
}
|
|
|
|
static int remove_direntries(BDRVVVFATState* s, int dir_index, int count)
|
|
{
|
|
int ret = array_remove_slice(&(s->directory), dir_index, count);
|
|
if (ret)
|
|
return ret;
|
|
adjust_dirindices(s, dir_index, -count);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Adapt the mappings of the cluster chain starting at first cluster
|
|
* (i.e. if a file starts at first_cluster, the chain is followed according
|
|
* to the modified fat, and the corresponding entries in s->mapping are
|
|
* adjusted)
|
|
*/
|
|
static int commit_mappings(BDRVVVFATState* s,
|
|
uint32_t first_cluster, int dir_index)
|
|
{
|
|
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
|
|
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
|
uint32_t cluster = first_cluster;
|
|
|
|
vvfat_close_current_file(s);
|
|
|
|
assert(mapping);
|
|
assert(mapping->begin == first_cluster);
|
|
mapping->first_mapping_index = -1;
|
|
mapping->dir_index = dir_index;
|
|
mapping->mode = (dir_index <= 0 || is_directory(direntry)) ?
|
|
MODE_DIRECTORY : MODE_NORMAL;
|
|
|
|
while (!fat_eof(s, cluster)) {
|
|
uint32_t c, c1;
|
|
|
|
for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1;
|
|
c = c1, c1 = modified_fat_get(s, c1));
|
|
|
|
c++;
|
|
if (c > mapping->end) {
|
|
int index = array_index(&(s->mapping), mapping);
|
|
int i, max_i = s->mapping.next - index;
|
|
for (i = 1; i < max_i && mapping[i].begin < c; i++);
|
|
while (--i > 0)
|
|
remove_mapping(s, index + 1);
|
|
}
|
|
assert(mapping == array_get(&(s->mapping), s->mapping.next - 1)
|
|
|| mapping[1].begin >= c);
|
|
mapping->end = c;
|
|
|
|
if (!fat_eof(s, c1)) {
|
|
int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next);
|
|
mapping_t* next_mapping = i >= s->mapping.next ? NULL :
|
|
array_get(&(s->mapping), i);
|
|
|
|
if (next_mapping == NULL || next_mapping->begin > c1) {
|
|
int i1 = array_index(&(s->mapping), mapping);
|
|
|
|
next_mapping = insert_mapping(s, c1, c1+1);
|
|
|
|
if (c1 < c)
|
|
i1++;
|
|
mapping = array_get(&(s->mapping), i1);
|
|
}
|
|
|
|
next_mapping->dir_index = mapping->dir_index;
|
|
next_mapping->first_mapping_index =
|
|
mapping->first_mapping_index < 0 ?
|
|
array_index(&(s->mapping), mapping) :
|
|
mapping->first_mapping_index;
|
|
next_mapping->path = mapping->path;
|
|
next_mapping->mode = mapping->mode;
|
|
next_mapping->read_only = mapping->read_only;
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
next_mapping->info.dir.parent_mapping_index =
|
|
mapping->info.dir.parent_mapping_index;
|
|
next_mapping->info.dir.first_dir_index =
|
|
mapping->info.dir.first_dir_index +
|
|
0x10 * s->sectors_per_cluster *
|
|
(mapping->end - mapping->begin);
|
|
} else
|
|
next_mapping->info.file.offset = mapping->info.file.offset +
|
|
mapping->end - mapping->begin;
|
|
|
|
mapping = next_mapping;
|
|
}
|
|
|
|
cluster = c1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int commit_direntries(BDRVVVFATState* s,
|
|
int dir_index, int parent_mapping_index)
|
|
{
|
|
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
|
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
|
|
mapping_t* mapping = find_mapping_for_cluster(s, first_cluster);
|
|
|
|
int factor = 0x10 * s->sectors_per_cluster;
|
|
int old_cluster_count, new_cluster_count;
|
|
int current_dir_index = mapping->info.dir.first_dir_index;
|
|
int first_dir_index = current_dir_index;
|
|
int ret, i;
|
|
uint32_t c;
|
|
|
|
DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index));
|
|
|
|
assert(direntry);
|
|
assert(mapping);
|
|
assert(mapping->begin == first_cluster);
|
|
assert(mapping->info.dir.first_dir_index < s->directory.next);
|
|
assert(mapping->mode & MODE_DIRECTORY);
|
|
assert(dir_index == 0 || is_directory(direntry));
|
|
|
|
mapping->info.dir.parent_mapping_index = parent_mapping_index;
|
|
|
|
if (first_cluster == 0) {
|
|
old_cluster_count = new_cluster_count =
|
|
s->last_cluster_of_root_directory;
|
|
} else {
|
|
for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
|
|
c = fat_get(s, c))
|
|
old_cluster_count++;
|
|
|
|
for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c);
|
|
c = modified_fat_get(s, c))
|
|
new_cluster_count++;
|
|
}
|
|
|
|
if (new_cluster_count > old_cluster_count) {
|
|
if (insert_direntries(s,
|
|
current_dir_index + factor * old_cluster_count,
|
|
factor * (new_cluster_count - old_cluster_count)) == NULL)
|
|
return -1;
|
|
} else if (new_cluster_count < old_cluster_count)
|
|
remove_direntries(s,
|
|
current_dir_index + factor * new_cluster_count,
|
|
factor * (old_cluster_count - new_cluster_count));
|
|
|
|
for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) {
|
|
direntry_t *first_direntry;
|
|
void* direntry = array_get(&(s->directory), current_dir_index);
|
|
int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry,
|
|
s->sectors_per_cluster);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* The first directory entry on the filesystem is the volume name */
|
|
first_direntry = (direntry_t*) s->directory.pointer;
|
|
assert(!memcmp(first_direntry->name, s->volume_label, 11));
|
|
|
|
current_dir_index += factor;
|
|
}
|
|
|
|
ret = commit_mappings(s, first_cluster, dir_index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* recurse */
|
|
for (i = 0; i < factor * new_cluster_count; i++) {
|
|
direntry = array_get(&(s->directory), first_dir_index + i);
|
|
if (is_directory(direntry) && !is_dot(direntry)) {
|
|
mapping = find_mapping_for_cluster(s, first_cluster);
|
|
assert(mapping->mode & MODE_DIRECTORY);
|
|
ret = commit_direntries(s, first_dir_index + i,
|
|
array_index(&(s->mapping), mapping));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* commit one file (adjust contents, adjust mapping),
|
|
return first_mapping_index */
|
|
static int commit_one_file(BDRVVVFATState* s,
|
|
int dir_index, uint32_t offset)
|
|
{
|
|
direntry_t* direntry = array_get(&(s->directory), dir_index);
|
|
uint32_t c = begin_of_direntry(direntry);
|
|
uint32_t first_cluster = c;
|
|
mapping_t* mapping = find_mapping_for_cluster(s, c);
|
|
uint32_t size = filesize_of_direntry(direntry);
|
|
char* cluster = g_malloc(s->cluster_size);
|
|
uint32_t i;
|
|
int fd = 0;
|
|
|
|
assert(offset < size);
|
|
assert((offset % s->cluster_size) == 0);
|
|
|
|
for (i = s->cluster_size; i < offset; i += s->cluster_size)
|
|
c = modified_fat_get(s, c);
|
|
|
|
fd = qemu_open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path,
|
|
strerror(errno), errno);
|
|
g_free(cluster);
|
|
return fd;
|
|
}
|
|
if (offset > 0) {
|
|
if (lseek(fd, offset, SEEK_SET) != offset) {
|
|
qemu_close(fd);
|
|
g_free(cluster);
|
|
return -3;
|
|
}
|
|
}
|
|
|
|
while (offset < size) {
|
|
uint32_t c1;
|
|
int rest_size = (size - offset > s->cluster_size ?
|
|
s->cluster_size : size - offset);
|
|
int ret;
|
|
|
|
c1 = modified_fat_get(s, c);
|
|
|
|
assert((size - offset == 0 && fat_eof(s, c)) ||
|
|
(size > offset && c >=2 && !fat_eof(s, c)));
|
|
|
|
ret = vvfat_read(s->bs, cluster2sector(s, c),
|
|
(uint8_t*)cluster, DIV_ROUND_UP(rest_size, 0x200));
|
|
|
|
if (ret < 0) {
|
|
qemu_close(fd);
|
|
g_free(cluster);
|
|
return ret;
|
|
}
|
|
|
|
if (write(fd, cluster, rest_size) < 0) {
|
|
qemu_close(fd);
|
|
g_free(cluster);
|
|
return -2;
|
|
}
|
|
|
|
offset += rest_size;
|
|
c = c1;
|
|
}
|
|
|
|
if (ftruncate(fd, size)) {
|
|
perror("ftruncate()");
|
|
qemu_close(fd);
|
|
g_free(cluster);
|
|
return -4;
|
|
}
|
|
qemu_close(fd);
|
|
g_free(cluster);
|
|
|
|
return commit_mappings(s, first_cluster, dir_index);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
/* test, if all mappings point to valid direntries */
|
|
static void check1(BDRVVVFATState* s)
|
|
{
|
|
int i;
|
|
for (i = 0; i < s->mapping.next; i++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), i);
|
|
if (mapping->mode & MODE_DELETED) {
|
|
fprintf(stderr, "deleted\n");
|
|
continue;
|
|
}
|
|
assert(mapping->dir_index < s->directory.next);
|
|
direntry_t* direntry = array_get(&(s->directory), mapping->dir_index);
|
|
assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0);
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next);
|
|
assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* test, if all direntries have mappings */
|
|
static void check2(BDRVVVFATState* s)
|
|
{
|
|
int i;
|
|
int first_mapping = -1;
|
|
|
|
for (i = 0; i < s->directory.next; i++) {
|
|
direntry_t* direntry = array_get(&(s->directory), i);
|
|
|
|
if (is_short_name(direntry) && begin_of_direntry(direntry)) {
|
|
mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry));
|
|
assert(mapping);
|
|
assert(mapping->dir_index == i || is_dot(direntry));
|
|
assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry));
|
|
}
|
|
|
|
if ((i % (0x10 * s->sectors_per_cluster)) == 0) {
|
|
/* cluster start */
|
|
int j, count = 0;
|
|
|
|
for (j = 0; j < s->mapping.next; j++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), j);
|
|
if (mapping->mode & MODE_DELETED)
|
|
continue;
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) {
|
|
assert(++count == 1);
|
|
if (mapping->first_mapping_index == -1)
|
|
first_mapping = array_index(&(s->mapping), mapping);
|
|
else
|
|
assert(first_mapping == mapping->first_mapping_index);
|
|
if (mapping->info.dir.parent_mapping_index < 0)
|
|
assert(j == 0);
|
|
else {
|
|
mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index);
|
|
assert(parent->mode & MODE_DIRECTORY);
|
|
assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (count == 0)
|
|
first_mapping = -1;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int handle_renames_and_mkdirs(BDRVVVFATState* s)
|
|
{
|
|
int i;
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "handle_renames\n");
|
|
for (i = 0; i < s->commits.next; i++) {
|
|
commit_t* commit = array_get(&(s->commits), i);
|
|
fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action);
|
|
}
|
|
#endif
|
|
|
|
for (i = 0; i < s->commits.next;) {
|
|
commit_t* commit = array_get(&(s->commits), i);
|
|
if (commit->action == ACTION_RENAME) {
|
|
mapping_t* mapping = find_mapping_for_cluster(s,
|
|
commit->param.rename.cluster);
|
|
char* old_path = mapping->path;
|
|
|
|
assert(commit->path);
|
|
mapping->path = commit->path;
|
|
if (rename(old_path, mapping->path))
|
|
return -2;
|
|
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
int l1 = strlen(mapping->path);
|
|
int l2 = strlen(old_path);
|
|
int diff = l1 - l2;
|
|
direntry_t* direntry = array_get(&(s->directory),
|
|
mapping->info.dir.first_dir_index);
|
|
uint32_t c = mapping->begin;
|
|
int i = 0;
|
|
|
|
/* recurse */
|
|
while (!fat_eof(s, c)) {
|
|
do {
|
|
direntry_t* d = direntry + i;
|
|
|
|
if (is_file(d) || (is_directory(d) && !is_dot(d))) {
|
|
mapping_t* m = find_mapping_for_cluster(s,
|
|
begin_of_direntry(d));
|
|
int l = strlen(m->path);
|
|
char* new_path = g_malloc(l + diff + 1);
|
|
|
|
assert(!strncmp(m->path, mapping->path, l2));
|
|
|
|
pstrcpy(new_path, l + diff + 1, mapping->path);
|
|
pstrcpy(new_path + l1, l + diff + 1 - l1,
|
|
m->path + l2);
|
|
|
|
schedule_rename(s, m->begin, new_path);
|
|
}
|
|
i++;
|
|
} while((i % (0x10 * s->sectors_per_cluster)) != 0);
|
|
c = fat_get(s, c);
|
|
}
|
|
}
|
|
|
|
g_free(old_path);
|
|
array_remove(&(s->commits), i);
|
|
continue;
|
|
} else if (commit->action == ACTION_MKDIR) {
|
|
mapping_t* mapping;
|
|
int j, parent_path_len;
|
|
|
|
#ifdef __MINGW32__
|
|
if (mkdir(commit->path))
|
|
return -5;
|
|
#else
|
|
if (mkdir(commit->path, 0755))
|
|
return -5;
|
|
#endif
|
|
|
|
mapping = insert_mapping(s, commit->param.mkdir.cluster,
|
|
commit->param.mkdir.cluster + 1);
|
|
if (mapping == NULL)
|
|
return -6;
|
|
|
|
mapping->mode = MODE_DIRECTORY;
|
|
mapping->read_only = 0;
|
|
mapping->path = commit->path;
|
|
j = s->directory.next;
|
|
assert(j);
|
|
insert_direntries(s, s->directory.next,
|
|
0x10 * s->sectors_per_cluster);
|
|
mapping->info.dir.first_dir_index = j;
|
|
|
|
parent_path_len = strlen(commit->path)
|
|
- strlen(get_basename(commit->path)) - 1;
|
|
for (j = 0; j < s->mapping.next; j++) {
|
|
mapping_t* m = array_get(&(s->mapping), j);
|
|
if (m->first_mapping_index < 0 && m != mapping &&
|
|
!strncmp(m->path, mapping->path, parent_path_len) &&
|
|
strlen(m->path) == parent_path_len)
|
|
break;
|
|
}
|
|
assert(j < s->mapping.next);
|
|
mapping->info.dir.parent_mapping_index = j;
|
|
|
|
array_remove(&(s->commits), i);
|
|
continue;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* TODO: make sure that the short name is not matching *another* file
|
|
*/
|
|
static int handle_commits(BDRVVVFATState* s)
|
|
{
|
|
int i, fail = 0;
|
|
|
|
vvfat_close_current_file(s);
|
|
|
|
for (i = 0; !fail && i < s->commits.next; i++) {
|
|
commit_t* commit = array_get(&(s->commits), i);
|
|
switch(commit->action) {
|
|
case ACTION_RENAME: case ACTION_MKDIR:
|
|
abort();
|
|
fail = -2;
|
|
break;
|
|
case ACTION_WRITEOUT: {
|
|
#ifndef NDEBUG
|
|
/* these variables are only used by assert() below */
|
|
direntry_t* entry = array_get(&(s->directory),
|
|
commit->param.writeout.dir_index);
|
|
uint32_t begin = begin_of_direntry(entry);
|
|
mapping_t* mapping = find_mapping_for_cluster(s, begin);
|
|
#endif
|
|
|
|
assert(mapping);
|
|
assert(mapping->begin == begin);
|
|
assert(commit->path == NULL);
|
|
|
|
if (commit_one_file(s, commit->param.writeout.dir_index,
|
|
commit->param.writeout.modified_offset))
|
|
fail = -3;
|
|
|
|
break;
|
|
}
|
|
case ACTION_NEW_FILE: {
|
|
int begin = commit->param.new_file.first_cluster;
|
|
mapping_t* mapping = find_mapping_for_cluster(s, begin);
|
|
direntry_t* entry;
|
|
int i;
|
|
|
|
/* find direntry */
|
|
for (i = 0; i < s->directory.next; i++) {
|
|
entry = array_get(&(s->directory), i);
|
|
if (is_file(entry) && begin_of_direntry(entry) == begin)
|
|
break;
|
|
}
|
|
|
|
if (i >= s->directory.next) {
|
|
fail = -6;
|
|
continue;
|
|
}
|
|
|
|
/* make sure there exists an initial mapping */
|
|
if (mapping && mapping->begin != begin) {
|
|
mapping->end = begin;
|
|
mapping = NULL;
|
|
}
|
|
if (mapping == NULL) {
|
|
mapping = insert_mapping(s, begin, begin+1);
|
|
}
|
|
/* most members will be fixed in commit_mappings() */
|
|
assert(commit->path);
|
|
mapping->path = commit->path;
|
|
mapping->read_only = 0;
|
|
mapping->mode = MODE_NORMAL;
|
|
mapping->info.file.offset = 0;
|
|
|
|
if (commit_one_file(s, i, 0))
|
|
fail = -7;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
if (i > 0 && array_remove_slice(&(s->commits), 0, i))
|
|
return -1;
|
|
return fail;
|
|
}
|
|
|
|
static int handle_deletes(BDRVVVFATState* s)
|
|
{
|
|
int i, deferred = 1, deleted = 1;
|
|
|
|
/* delete files corresponding to mappings marked as deleted */
|
|
/* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */
|
|
while (deferred && deleted) {
|
|
deferred = 0;
|
|
deleted = 0;
|
|
|
|
for (i = 1; i < s->mapping.next; i++) {
|
|
mapping_t* mapping = array_get(&(s->mapping), i);
|
|
if (mapping->mode & MODE_DELETED) {
|
|
direntry_t* entry = array_get(&(s->directory),
|
|
mapping->dir_index);
|
|
|
|
if (is_free(entry)) {
|
|
/* remove file/directory */
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
int j, next_dir_index = s->directory.next,
|
|
first_dir_index = mapping->info.dir.first_dir_index;
|
|
|
|
if (rmdir(mapping->path) < 0) {
|
|
if (errno == ENOTEMPTY) {
|
|
deferred++;
|
|
continue;
|
|
} else
|
|
return -5;
|
|
}
|
|
|
|
for (j = 1; j < s->mapping.next; j++) {
|
|
mapping_t* m = array_get(&(s->mapping), j);
|
|
if (m->mode & MODE_DIRECTORY &&
|
|
m->info.dir.first_dir_index >
|
|
first_dir_index &&
|
|
m->info.dir.first_dir_index <
|
|
next_dir_index)
|
|
next_dir_index =
|
|
m->info.dir.first_dir_index;
|
|
}
|
|
remove_direntries(s, first_dir_index,
|
|
next_dir_index - first_dir_index);
|
|
|
|
deleted++;
|
|
}
|
|
} else {
|
|
if (unlink(mapping->path))
|
|
return -4;
|
|
deleted++;
|
|
}
|
|
DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry));
|
|
remove_mapping(s, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* synchronize mapping with new state:
|
|
*
|
|
* - copy FAT (with bdrv_read)
|
|
* - mark all filenames corresponding to mappings as deleted
|
|
* - recurse direntries from root (using bs->bdrv_read)
|
|
* - delete files corresponding to mappings marked as deleted
|
|
*/
|
|
static int do_commit(BDRVVVFATState* s)
|
|
{
|
|
int ret = 0;
|
|
|
|
/* the real meat are the commits. Nothing to do? Move along! */
|
|
if (s->commits.next == 0)
|
|
return 0;
|
|
|
|
vvfat_close_current_file(s);
|
|
|
|
ret = handle_renames_and_mkdirs(s);
|
|
if (ret) {
|
|
fprintf(stderr, "Error handling renames (%d)\n", ret);
|
|
abort();
|
|
return ret;
|
|
}
|
|
|
|
/* copy FAT (with bdrv_read) */
|
|
memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat);
|
|
|
|
/* recurse direntries from root (using bs->bdrv_read) */
|
|
ret = commit_direntries(s, 0, -1);
|
|
if (ret) {
|
|
fprintf(stderr, "Fatal: error while committing (%d)\n", ret);
|
|
abort();
|
|
return ret;
|
|
}
|
|
|
|
ret = handle_commits(s);
|
|
if (ret) {
|
|
fprintf(stderr, "Error handling commits (%d)\n", ret);
|
|
abort();
|
|
return ret;
|
|
}
|
|
|
|
ret = handle_deletes(s);
|
|
if (ret) {
|
|
fprintf(stderr, "Error deleting\n");
|
|
abort();
|
|
return ret;
|
|
}
|
|
|
|
if (s->qcow->bs->drv && s->qcow->bs->drv->bdrv_make_empty) {
|
|
s->qcow->bs->drv->bdrv_make_empty(s->qcow->bs);
|
|
}
|
|
|
|
memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
|
|
|
|
DLOG(checkpoint());
|
|
return 0;
|
|
}
|
|
|
|
static int try_commit(BDRVVVFATState* s)
|
|
{
|
|
vvfat_close_current_file(s);
|
|
DLOG(checkpoint());
|
|
if(!is_consistent(s))
|
|
return -1;
|
|
return do_commit(s);
|
|
}
|
|
|
|
static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
int i, ret;
|
|
|
|
DLOG(checkpoint());
|
|
|
|
/* Check if we're operating in read-only mode */
|
|
if (s->qcow == NULL) {
|
|
return -EACCES;
|
|
}
|
|
|
|
vvfat_close_current_file(s);
|
|
|
|
/*
|
|
* Some sanity checks:
|
|
* - do not allow writing to the boot sector
|
|
*/
|
|
|
|
if (sector_num < s->offset_to_fat)
|
|
return -1;
|
|
|
|
for (i = sector2cluster(s, sector_num);
|
|
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
|
|
mapping_t* mapping = find_mapping_for_cluster(s, i);
|
|
if (mapping) {
|
|
if (mapping->read_only) {
|
|
fprintf(stderr, "Tried to write to write-protected file %s\n",
|
|
mapping->path);
|
|
return -1;
|
|
}
|
|
|
|
if (mapping->mode & MODE_DIRECTORY) {
|
|
int begin = cluster2sector(s, i);
|
|
int end = begin + s->sectors_per_cluster, k;
|
|
int dir_index;
|
|
const direntry_t* direntries;
|
|
long_file_name lfn;
|
|
|
|
lfn_init(&lfn);
|
|
|
|
if (begin < sector_num)
|
|
begin = sector_num;
|
|
if (end > sector_num + nb_sectors)
|
|
end = sector_num + nb_sectors;
|
|
dir_index = mapping->dir_index +
|
|
0x10 * (begin - mapping->begin * s->sectors_per_cluster);
|
|
direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
|
|
|
|
for (k = 0; k < (end - begin) * 0x10; k++) {
|
|
/* no access to the direntry of a read-only file */
|
|
if (is_short_name(direntries + k) &&
|
|
(direntries[k].attributes & 1)) {
|
|
if (memcmp(direntries + k,
|
|
array_get(&(s->directory), dir_index + k),
|
|
sizeof(direntry_t))) {
|
|
warn_report("tried to write to write-protected "
|
|
"file");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
i = mapping->end;
|
|
} else
|
|
i++;
|
|
}
|
|
|
|
/*
|
|
* Use qcow backend. Commit later.
|
|
*/
|
|
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
|
|
ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Error writing to qcow backend\n");
|
|
return ret;
|
|
}
|
|
|
|
for (i = sector2cluster(s, sector_num);
|
|
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
|
|
if (i >= 0)
|
|
s->used_clusters[i] |= USED_ALLOCATED;
|
|
|
|
DLOG(checkpoint());
|
|
/* TODO: add timeout */
|
|
try_commit(s);
|
|
|
|
DLOG(checkpoint());
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int flags)
|
|
{
|
|
int ret;
|
|
BDRVVVFATState *s = bs->opaque;
|
|
uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
|
|
int nb_sectors = bytes >> BDRV_SECTOR_BITS;
|
|
void *buf;
|
|
|
|
assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
|
|
buf = g_try_malloc(bytes);
|
|
if (bytes && buf == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
qemu_iovec_to_buf(qiov, 0, buf, bytes);
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
ret = vvfat_write(bs, sector_num, buf, nb_sectors);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
|
|
g_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, int *n, BlockDriverState **file)
|
|
{
|
|
*n = bs->total_sectors - sector_num;
|
|
if (*n > nb_sectors) {
|
|
*n = nb_sectors;
|
|
} else if (*n < 0) {
|
|
return 0;
|
|
}
|
|
return BDRV_BLOCK_DATA;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int flags)
|
|
{
|
|
int ret;
|
|
|
|
BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
|
|
qemu_co_mutex_lock(&s->lock);
|
|
ret = try_commit(s);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void write_target_close(BlockDriverState *bs) {
|
|
BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
|
|
bdrv_unref_child(s->bs, s->qcow);
|
|
g_free(s->qcow_filename);
|
|
}
|
|
|
|
static BlockDriver vvfat_write_target = {
|
|
.format_name = "vvfat_write_target",
|
|
.instance_size = sizeof(void*),
|
|
.bdrv_co_pwritev = write_target_commit,
|
|
.bdrv_close = write_target_close,
|
|
};
|
|
|
|
static void vvfat_qcow_options(int *child_flags, QDict *child_options,
|
|
int parent_flags, QDict *parent_options)
|
|
{
|
|
qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off");
|
|
*child_flags = BDRV_O_NO_FLUSH;
|
|
}
|
|
|
|
static const BdrvChildRole child_vvfat_qcow = {
|
|
.inherit_options = vvfat_qcow_options,
|
|
};
|
|
|
|
static int enable_write_target(BlockDriverState *bs, Error **errp)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
BlockDriver *bdrv_qcow = NULL;
|
|
BlockDriverState *backing;
|
|
QemuOpts *opts = NULL;
|
|
int ret;
|
|
int size = sector2cluster(s, s->sector_count);
|
|
QDict *options;
|
|
|
|
s->used_clusters = calloc(size, 1);
|
|
|
|
array_init(&(s->commits), sizeof(commit_t));
|
|
|
|
s->qcow_filename = g_malloc(PATH_MAX);
|
|
ret = get_tmp_filename(s->qcow_filename, PATH_MAX);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "can't create temporary file");
|
|
goto err;
|
|
}
|
|
|
|
bdrv_qcow = bdrv_find_format("qcow");
|
|
if (!bdrv_qcow) {
|
|
error_setg(errp, "Failed to locate qcow driver");
|
|
ret = -ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
|
|
qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512,
|
|
&error_abort);
|
|
qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
|
|
|
|
ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
|
|
qemu_opts_del(opts);
|
|
if (ret < 0) {
|
|
goto err;
|
|
}
|
|
|
|
options = qdict_new();
|
|
qdict_put_str(options, "write-target.driver", "qcow");
|
|
s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
|
|
&child_vvfat_qcow, false, errp);
|
|
QDECREF(options);
|
|
if (!s->qcow) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
unlink(s->qcow_filename);
|
|
#endif
|
|
|
|
backing = bdrv_new_open_driver(&vvfat_write_target, NULL, BDRV_O_ALLOW_RDWR,
|
|
&error_abort);
|
|
*(void**) backing->opaque = s;
|
|
|
|
bdrv_set_backing_hd(s->bs, backing, &error_abort);
|
|
bdrv_unref(backing);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
g_free(s->qcow_filename);
|
|
s->qcow_filename = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
|
|
const BdrvChildRole *role,
|
|
BlockReopenQueue *reopen_queue,
|
|
uint64_t perm, uint64_t shared,
|
|
uint64_t *nperm, uint64_t *nshared)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
|
|
assert(c == s->qcow || role == &child_backing);
|
|
|
|
if (c == s->qcow) {
|
|
/* This is a private node, nobody should try to attach to it */
|
|
*nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
|
|
*nshared = BLK_PERM_WRITE_UNCHANGED;
|
|
} else {
|
|
/* The backing file is there so 'commit' can use it. vvfat doesn't
|
|
* access it in any way. */
|
|
*nperm = 0;
|
|
*nshared = BLK_PERM_ALL;
|
|
}
|
|
}
|
|
|
|
static void vvfat_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVVFATState *s = bs->opaque;
|
|
|
|
vvfat_close_current_file(s);
|
|
array_free(&(s->fat));
|
|
array_free(&(s->directory));
|
|
array_free(&(s->mapping));
|
|
g_free(s->cluster_buffer);
|
|
|
|
if (s->qcow) {
|
|
migrate_del_blocker(s->migration_blocker);
|
|
error_free(s->migration_blocker);
|
|
}
|
|
}
|
|
|
|
static BlockDriver bdrv_vvfat = {
|
|
.format_name = "vvfat",
|
|
.protocol_name = "fat",
|
|
.instance_size = sizeof(BDRVVVFATState),
|
|
|
|
.bdrv_parse_filename = vvfat_parse_filename,
|
|
.bdrv_file_open = vvfat_open,
|
|
.bdrv_refresh_limits = vvfat_refresh_limits,
|
|
.bdrv_close = vvfat_close,
|
|
.bdrv_child_perm = vvfat_child_perm,
|
|
|
|
.bdrv_co_preadv = vvfat_co_preadv,
|
|
.bdrv_co_pwritev = vvfat_co_pwritev,
|
|
.bdrv_co_get_block_status = vvfat_co_get_block_status,
|
|
};
|
|
|
|
static void bdrv_vvfat_init(void)
|
|
{
|
|
bdrv_register(&bdrv_vvfat);
|
|
}
|
|
|
|
block_init(bdrv_vvfat_init);
|
|
|
|
#ifdef DEBUG
|
|
static void checkpoint(void)
|
|
{
|
|
assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2);
|
|
check1(vvv);
|
|
check2(vvv);
|
|
assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY));
|
|
}
|
|
#endif
|