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authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/block/vvfat.c
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/block/vvfat.c')
-rw-r--r--qemu/block/vvfat.c3050
1 files changed, 0 insertions, 3050 deletions
diff --git a/qemu/block/vvfat.c b/qemu/block/vvfat.c
deleted file mode 100644
index 183fc4f04..000000000
--- a/qemu/block/vvfat.c
+++ /dev/null
@@ -1,3050 +0,0 @@
-/* vim:set shiftwidth=4 ts=4: */
-/*
- * QEMU Block driver for virtual VFAT (shadows a local directory)
- *
- * Copyright (c) 2004,2005 Johannes E. Schindelin
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "qemu/osdep.h"
-#include <dirent.h>
-#include "qapi/error.h"
-#include "block/block_int.h"
-#include "qemu/module.h"
-#include "migration/migration.h"
-#include "qapi/qmp/qint.h"
-#include "qapi/qmp/qbool.h"
-#include "qapi/qmp/qstring.h"
-#include "qemu/cutils.h"
-
-#ifndef S_IWGRP
-#define S_IWGRP 0
-#endif
-#ifndef S_IWOTH
-#define S_IWOTH 0
-#endif
-
-/* TODO: add ":bootsector=blabla.img:" */
-/* LATER TODO: add automatic boot sector generation from
- BOOTEASY.ASM and Ranish Partition Manager
- Note that DOS assumes the system files to be the first files in the
- file system (test if the boot sector still relies on that fact)! */
-/* MAYBE TODO: write block-visofs.c */
-/* TODO: call try_commit() only after a timeout */
-
-/* #define DEBUG */
-
-#ifdef DEBUG
-
-#define DLOG(a) a
-
-static void checkpoint(void);
-
-#ifdef __MINGW32__
-void nonono(const char* file, int line, const char* msg) {
- fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg);
- exit(-5);
-}
-#undef assert
-#define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0)
-#endif
-
-#else
-
-#define DLOG(a)
-
-#endif
-
-/* dynamic array functions */
-typedef struct array_t {
- char* pointer;
- unsigned int size,next,item_size;
-} array_t;
-
-static inline void array_init(array_t* array,unsigned int item_size)
-{
- array->pointer = NULL;
- array->size=0;
- array->next=0;
- array->item_size=item_size;
-}
-
-static inline void array_free(array_t* array)
-{
- g_free(array->pointer);
- array->size=array->next=0;
-}
-
-/* does not automatically grow */
-static inline void* array_get(array_t* array,unsigned int index) {
- assert(index < array->next);
- return array->pointer + index * array->item_size;
-}
-
-static inline int array_ensure_allocated(array_t* array, int index)
-{
- if((index + 1) * array->item_size > array->size) {
- int new_size = (index + 32) * array->item_size;
- array->pointer = g_realloc(array->pointer, new_size);
- if (!array->pointer)
- return -1;
- array->size = new_size;
- array->next = index + 1;
- }
-
- return 0;
-}
-
-static inline void* array_get_next(array_t* array) {
- unsigned int next = array->next;
- void* result;
-
- if (array_ensure_allocated(array, next) < 0)
- return NULL;
-
- array->next = next + 1;
- result = array_get(array, next);
-
- return result;
-}
-
-static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
- if((array->next+count)*array->item_size>array->size) {
- int increment=count*array->item_size;
- array->pointer=g_realloc(array->pointer,array->size+increment);
- if(!array->pointer)
- return NULL;
- array->size+=increment;
- }
- memmove(array->pointer+(index+count)*array->item_size,
- array->pointer+index*array->item_size,
- (array->next-index)*array->item_size);
- array->next+=count;
- return array->pointer+index*array->item_size;
-}
-
-/* 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)
-{
- char* buf;
- char* from;
- char* to;
- int is;
-
- if(!array ||
- index_to<0 || index_to>=array->next ||
- index_from<0 || index_from>=array->next)
- return -1;
-
- if(index_to==index_from)
- return 0;
-
- is=array->item_size;
- from=array->pointer+index_from*is;
- to=array->pointer+index_to*is;
- buf=g_malloc(is*count);
- memcpy(buf,from,is*count);
-
- if(index_to<index_from)
- memmove(to+is*count,to,from-to);
- else
- memmove(from,from+is*count,to-from);
-
- memcpy(to,buf,is*count);
-
- g_free(buf);
-
- return 0;
-}
-
-static inline int array_remove_slice(array_t* array,int index, int count)
-{
- assert(index >=0);
- assert(count > 0);
- assert(index + count <= array->next);
- if(array_roll(array,array->next-1,index,count))
- return -1;
- array->next -= count;
- return 0;
-}
-
-static int array_remove(array_t* array,int index)
-{
- return array_remove_slice(array, index, 1);
-}
-
-/* return the index for a given member */
-static int array_index(array_t* array, void* pointer)
-{
- size_t offset = (char*)pointer - array->pointer;
- assert((offset % array->item_size) == 0);
- assert(offset/array->item_size < array->next);
- return offset/array->item_size;
-}
-
-/* These structures are used to fake a disk and the VFAT filesystem.
- * For this reason we need to use QEMU_PACKED. */
-
-typedef struct bootsector_t {
- uint8_t jump[3];
- uint8_t name[8];
- uint16_t sector_size;
- uint8_t sectors_per_cluster;
- uint16_t reserved_sectors;
- uint8_t number_of_fats;
- uint16_t root_entries;
- uint16_t total_sectors16;
- uint8_t media_type;
- uint16_t sectors_per_fat;
- uint16_t sectors_per_track;
- uint16_t number_of_heads;
- uint32_t hidden_sectors;
- uint32_t total_sectors;
- union {
- struct {
- uint8_t drive_number;
- uint8_t current_head;
- uint8_t signature;
- uint32_t id;
- uint8_t volume_label[11];
- } QEMU_PACKED fat16;
- struct {
- uint32_t sectors_per_fat;
- uint16_t flags;
- uint8_t major,minor;
- uint32_t first_cluster_of_root_directory;
- uint16_t info_sector;
- uint16_t backup_boot_sector;
- uint16_t ignored;
- } QEMU_PACKED fat32;
- } u;
- uint8_t fat_type[8];
- uint8_t ignored[0x1c0];
- uint8_t magic[2];
-} QEMU_PACKED bootsector_t;
-
-typedef struct {
- uint8_t head;
- uint8_t sector;
- uint8_t cylinder;
-} mbr_chs_t;
-
-typedef struct partition_t {
- uint8_t attributes; /* 0x80 = bootable */
- mbr_chs_t start_CHS;
- uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */
- mbr_chs_t end_CHS;
- uint32_t start_sector_long;
- uint32_t length_sector_long;
-} QEMU_PACKED partition_t;
-
-typedef struct mbr_t {
- uint8_t ignored[0x1b8];
- uint32_t nt_id;
- uint8_t ignored2[2];
- partition_t partition[4];
- uint8_t magic[2];
-} QEMU_PACKED mbr_t;
-
-typedef struct direntry_t {
- uint8_t name[8 + 3];
- uint8_t attributes;
- uint8_t reserved[2];
- uint16_t ctime;
- uint16_t cdate;
- uint16_t adate;
- uint16_t begin_hi;
- uint16_t mtime;
- uint16_t mdate;
- uint16_t begin;
- uint32_t size;
-} QEMU_PACKED direntry_t;
-
-/* this structure are used to transparently access the files */
-
-typedef struct mapping_t {
- /* begin is the first cluster, end is the last+1 */
- uint32_t begin,end;
- /* as s->directory is growable, no pointer may be used here */
- unsigned int dir_index;
- /* the clusters of a file may be in any order; this points to the first */
- int first_mapping_index;
- union {
- /* offset is
- * - the offset in the file (in clusters) for a file, or
- * - the next cluster of the directory for a directory, and
- * - the address of the buffer for a faked entry
- */
- struct {
- 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 { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2,
- MODE_DIRECTORY = 4, MODE_FAKED = 8,
- MODE_DELETED = 16, MODE_RENAMED = 32 } 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 int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */
- unsigned char first_sectors[0x40*0x200];
-
- int fat_type; /* 16 or 32 */
- array_t fat,directory,mapping;
- char volume_label[11];
-
- unsigned int cluster_size;
- unsigned int sectors_per_cluster;
- unsigned int sectors_per_fat;
- unsigned int sectors_of_root_directory;
- uint32_t last_cluster_of_root_directory;
- unsigned int faked_sectors; /* how many sectors are faked before file data */
- 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;
-
- 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;
-
- /* write support */
- BlockDriverState* write_target;
- char* qcow_filename;
- BlockDriverState* qcow;
- void* fat2;
- char* used_clusters;
- array_t commits;
- const char* path;
- int downcase_short_names;
-
- 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 */
- chs->head = 0xFF;
- chs->sector = 0xFF;
- chs->cylinder = 0xFF;
- return 1;
- }
- chs->head = (uint8_t)head;
- chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) );
- chs->cylinder = (uint8_t)spos;
- 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->first_sectors_number - 1,
- 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->first_sectors_number - 1);
- partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
- - s->first_sectors_number + 1);
-
- /* 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):
- /*fat_tyoe==32*/ (lba?0xc:0x0b);
-
- real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa;
-}
-
-/* direntry functions */
-
-/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */
-static inline int short2long_name(char* dest,const char* src)
-{
- int i;
- int len;
- for(i=0;i<129 && src[i];i++) {
- dest[2*i]=src[i];
- dest[2*i+1]=0;
- }
- len=2*i;
- dest[2*i]=dest[2*i+1]=0;
- for(i=2*i+2;(i%26);i++)
- dest[i]=0xff;
- return len;
-}
-
-static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename)
-{
- char buffer[258];
- int length=short2long_name(buffer,filename),
- number_of_entries=(length+25)/26,i;
- direntry_t* entry;
-
- for(i=0;i<number_of_entries;i++) {
- entry=array_get_next(&(s->directory));
- entry->attributes=0xf;
- entry->reserved[0]=0;
- entry->begin=0;
- entry->name[0]=(number_of_entries-i)|(i==0?0x40:0);
- }
- for(i=0;i<26*number_of_entries;i++) {
- int offset=(i%26);
- if(offset<10) offset=1+offset;
- else if(offset<22) offset=14+offset-10;
- else offset=28+offset-22;
- entry=array_get(&(s->directory),s->directory.next-1-(i/26));
- entry->name[offset]=buffer[i];
- }
- return array_get(&(s->directory),s->directory.next-number_of_entries);
-}
-
-static char is_free(const direntry_t* direntry)
-{
- return direntry->name[0]==0xe5 || direntry->name[0]==0x00;
-}
-
-static char is_volume_label(const direntry_t* direntry)
-{
- return direntry->attributes == 0x28;
-}
-
-static char is_long_name(const direntry_t* direntry)
-{
- return direntry->attributes == 0xf;
-}
-
-static char is_short_name(const direntry_t* direntry)
-{
- return !is_volume_label(direntry) && !is_long_name(direntry)
- && !is_free(direntry);
-}
-
-static char is_directory(const direntry_t* direntry)
-{
- return direntry->attributes & 0x10 && direntry->name[0] != 0xe5;
-}
-
-static inline char is_dot(const direntry_t* direntry)
-{
- return is_short_name(direntry) && direntry->name[0] == '.';
-}
-
-static char is_file(const direntry_t* direntry)
-{
- return is_short_name(direntry) && !is_directory(direntry);
-}
-
-static inline uint32_t begin_of_direntry(const direntry_t* direntry)
-{
- return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16);
-}
-
-static inline uint32_t filesize_of_direntry(const direntry_t* direntry)
-{
- return le32_to_cpu(direntry->size);
-}
-
-static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin)
-{
- direntry->begin = cpu_to_le16(begin & 0xffff);
- direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff);
-}
-
-/* fat functions */
-
-static inline uint8_t fat_chksum(const direntry_t* entry)
-{
- uint8_t chksum=0;
- int i;
-
- for (i = 0; i < 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... */
- }
-
-}
-
-/* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */
-/* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */
-static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s,
- unsigned int directory_start, const char* filename, int is_dot)
-{
- int i,j,long_index=s->directory.next;
- direntry_t* entry = 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);
-
- i = strlen(filename);
- for(j = i - 1; j>0 && filename[j]!='.';j--);
- if (j > 0)
- i = (j > 8 ? 8 : j);
- else if (i > 8)
- i = 8;
-
- entry=array_get_next(&(s->directory));
- memset(entry->name, 0x20, sizeof(entry->name));
- memcpy(entry->name, filename, i);
-
- if (j > 0) {
- for (i = 0; i < 3 && filename[j + 1 + i]; i++) {
- entry->name[8 + i] = filename[j + 1 + i];
- }
- }
-
- /* upcase & remove unwanted characters */
- for(i=10;i>=0;i--) {
- if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--);
- if(entry->name[i]<=' ' || entry->name[i]>0x7f
- || strchr(".*?<>|\":/\\[];,+='",entry->name[i]))
- entry->name[i]='_';
- else if(entry->name[i]>='a' && entry->name[i]<='z')
- entry->name[i]+='A'-'a';
- }
-
- /* mangle duplicates */
- while(1) {
- direntry_t* entry1=array_get(&(s->directory),directory_start);
- int j;
-
- for(;entry1<entry;entry1++)
- if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11))
- break; /* found dupe */
- if(entry1==entry) /* no dupe found */
- break;
-
- /* use all 8 characters of name */
- if(entry->name[7]==' ') {
- int j;
- for(j=6;j>0 && entry->name[j]==' ';j--)
- entry->name[j]='~';
- }
-
- /* increment number */
- for(j=7;j>0 && entry->name[j]=='9';j--)
- entry->name[j]='0';
- if(j>0) {
- if(entry->name[j]<'0' || entry->name[j]>'9')
- entry->name[j]='0';
- else
- entry->name[j]++;
- }
- }
-
- /* calculate checksum; propagate to long name */
- if(entry_long) {
- uint8_t chksum=fat_chksum(entry);
-
- /* calculate anew, because realloc could have taken place */
- entry_long=array_get(&(s->directory),long_index);
- while(entry_long<entry && is_long_name(entry_long)) {
- entry_long->reserved[1]=chksum;
- entry_long++;
- }
- }
-
- return entry;
-}
-
-/*
- * Read a directory. (the index of the corresponding mapping must be passed).
- */
-static int read_directory(BDRVVVFATState* s, int mapping_index)
-{
- mapping_t* mapping = array_get(&(s->mapping), mapping_index);
- direntry_t* direntry;
- const char* dirname = mapping->path;
- int first_cluster = mapping->begin;
- int parent_index = mapping->info.dir.parent_mapping_index;
- mapping_t* parent_mapping = (mapping_t*)
- (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : 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;
-
- /* actually read the directory, and allocate the mappings */
- while((entry=readdir(dir))) {
- unsigned int length=strlen(dirname)+2+strlen(entry->d_name);
- char* buffer;
- direntry_t* direntry;
- struct stat st;
- int is_dot=!strcmp(entry->d_name,".");
- int is_dotdot=!strcmp(entry->d_name,"..");
-
- if(first_cluster == 0 && (is_dotdot || is_dot))
- continue;
-
- buffer = 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 */
- direntry=create_short_and_long_name(s, i, entry->d_name,
- is_dot || is_dotdot);
- direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20);
- direntry->reserved[0]=direntry->reserved[1]=0;
- direntry->ctime=fat_datetime(st.st_ctime,1);
- direntry->cdate=fat_datetime(st.st_ctime,0);
- direntry->adate=fat_datetime(st.st_atime,0);
- direntry->begin_hi=0;
- direntry->mtime=fat_datetime(st.st_mtime,1);
- direntry->mdate=fat_datetime(st.st_mtime,0);
- if(is_dotdot)
- set_begin_of_direntry(direntry, first_cluster_of_parent);
- else if(is_dot)
- set_begin_of_direntry(direntry, first_cluster);
- else
- direntry->begin=0; /* do that later */
- if (st.st_size > 0x7fffffff) {
- fprintf(stderr, "File %s is larger than 2GB\n", buffer);
- 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));
- }
-
-/* TODO: if there are more entries, bootsector has to be adjusted! */
-#define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster)
- if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) {
- /* root directory */
- int cur = s->directory.next;
- array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1);
- s->directory.next = ROOT_ENTRIES;
- memset(array_get(&(s->directory), cur), 0,
- (ROOT_ENTRIES - cur) * sizeof(direntry_t));
- }
-
- /* reget 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->faked_sectors)/s->sectors_per_cluster;
-}
-
-static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num)
-{
- return s->faked_sectors + s->sectors_per_cluster * cluster_num;
-}
-
-static 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 */
-
- 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);
-
- s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2;
- s->cluster_count=sector2cluster(s, s->sector_count);
-
- mapping = array_get_next(&(s->mapping));
- mapping->begin = 0;
- mapping->dir_index = 0;
- mapping->info.dir.parent_mapping_index = -1;
- mapping->first_mapping_index = -1;
- mapping->path = 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->sectors_of_root_directory = mapping->end * s->sectors_per_cluster;
- s->last_cluster_of_root_directory = mapping->end;
-
- /* the FAT signature */
- fat_set(s,0,s->max_fat_value);
- fat_set(s,1,s->max_fat_value);
-
- s->current_mapping = NULL;
-
- bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200);
- bootsector->jump[0]=0xeb;
- bootsector->jump[1]=0x3e;
- bootsector->jump[2]=0x90;
- memcpy(bootsector->name,"QEMU ",8);
- bootsector->sector_size=cpu_to_le16(0x200);
- bootsector->sectors_per_cluster=s->sectors_per_cluster;
- bootsector->reserved_sectors=cpu_to_le16(1);
- bootsector->number_of_fats=0x2; /* number of FATs */
- bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10);
- bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count);
- bootsector->media_type=(s->first_sectors_number>1?0xf8:0xf0); /* media descriptor (f8=hd, f0=3.5 fd)*/
- 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->first_sectors_number==1?0:0x3f);
- bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0);
-
- /* LATER TODO: if FAT32, this is wrong */
- bootsector->u.fat16.drive_number=s->first_sectors_number==1?0:0x80; /* fda=0, hda=0x80 */
- bootsector->u.fat16.current_head=0;
- bootsector->u.fat16.signature=0x29;
- bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
-
- memcpy(bootsector->u.fat16.volume_label, s->volume_label,
- sizeof(bootsector->u.fat16.volume_label));
- memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8);
- bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
-
- return 0;
-}
-
-#ifdef DEBUG
-static BDRVVVFATState *vvv = NULL;
-#endif
-
-static int enable_write_target(BDRVVVFATState *s, 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(options, "dir", qstring_from_str(filename));
- qdict_put(options, "fat-type", qint_from_int(fat_type));
- qdict_put(options, "floppy", qbool_from_bool(floppy));
- qdict_put(options, "rw", qbool_from_bool(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;
- }
- s->first_sectors_number = 1;
- cyls = 80;
- heads = 2;
- } else {
- /* 32MB or 504MB disk*/
- if (!s->fat_type) {
- s->fat_type = 16;
- }
- s->first_sectors_number = 0x40;
- cyls = s->fat_type == 12 ? 64 : 1024;
- heads = 16;
- secs = 63;
- }
-
- switch (s->fat_type) {
- case 32:
- fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. "
- "You are welcome to do so!\n");
- 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;
-
- /* read only is the default for safety */
- bs->read_only = 1;
- s->qcow = s->write_target = NULL;
- s->qcow_filename = NULL;
- s->fat2 = NULL;
- s->downcase_short_names = 1;
-
- fprintf(stderr, "vvfat %s chs %d,%d,%d\n",
- dirname, cyls, heads, secs);
-
- s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1);
-
- if (qemu_opt_get_bool(opts, "rw", false)) {
- ret = enable_write_target(s, errp);
- if (ret < 0) {
- goto fail;
- }
- bs->read_only = 0;
- }
-
- bs->total_sectors = cyls * heads * secs;
-
- if (init_directories(s, dirname, heads, secs, errp)) {
- ret = -EIO;
- goto fail;
- }
-
- s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count;
-
- if (s->first_sectors_number == 0x40) {
- init_mbr(s, cyls, heads, secs);
- }
-
- // assert(is_consistent(s));
- qemu_co_mutex_init(&s->lock);
-
- /* 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));
- migrate_add_blocker(s->migration_blocker);
- }
-
- ret = 0;
-fail:
- qemu_opts_del(opts);
- return ret;
-}
-
-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) {
- int n;
- if (bdrv_is_allocated(s->qcow, sector_num, nb_sectors-i, &n)) {
-DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n));
- if (bdrv_read(s->qcow, sector_num, buf + i*0x200, n)) {
- return -1;
- }
- i += n - 1;
- sector_num += n - 1;
- continue;
- }
-DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num));
- }
- if(sector_num<s->faked_sectors) {
- if(sector_num<s->first_sectors_number)
- memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200);
- else if(sector_num-s->first_sectors_number<s->sectors_per_fat)
- memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200);
- else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat)
- memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200);
- } else {
- uint32_t sector=sector_num-s->faked_sectors,
- sector_offset_in_cluster=(sector%s->sectors_per_cluster),
- cluster_num=sector/s->sectors_per_cluster;
- if(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 coroutine_fn int vvfat_co_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
-{
- int ret;
- BDRVVVFATState *s = bs->opaque;
- qemu_co_mutex_lock(&s->lock);
- ret = vvfat_read(bs, sector_num, buf, nb_sectors);
- qemu_co_mutex_unlock(&s->lock);
- 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];
- int checksum, len;
- int sequence_number;
-} long_file_name;
-
-static void lfn_init(long_file_name* lfn)
-{
- lfn->sequence_number = lfn->len = 0;
- lfn->checksum = 0x100;
-}
-
-/* return 0 if parsed successfully, > 0 if no long name, < 0 if error */
-static int parse_long_name(long_file_name* lfn,
- const direntry_t* direntry)
-{
- int i, j, offset;
- const unsigned char* pointer = (const unsigned char*)direntry;
-
- if (!is_long_name(direntry))
- return 1;
-
- if (pointer[0] & 0x40) {
- lfn->sequence_number = pointer[0] & 0x3f;
- lfn->checksum = pointer[13];
- lfn->name[0] = 0;
- lfn->name[lfn->sequence_number * 13] = 0;
- } else if ((pointer[0] & 0x3f) != --lfn->sequence_number)
- return -1;
- else if (pointer[13] != lfn->checksum)
- return -2;
- else if (pointer[12] || pointer[26] || pointer[27])
- return -3;
-
- offset = 13 * (lfn->sequence_number - 1);
- for (i = 0, j = 1; i < 13; i++, j+=2) {
- if (j == 11)
- j = 14;
- else if (j == 26)
- j = 28;
-
- if (pointer[j+1] == 0)
- lfn->name[offset + i] = pointer[j];
- else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0)
- return -4;
- else
- lfn->name[offset + i] = 0;
- }
-
- if (pointer[0] & 0x40)
- lfn->len = offset + strlen((char*)lfn->name + offset);
-
- return 0;
-}
-
-/* returns 0 if successful, >0 if no short_name, and <0 on error */
-static int parse_short_name(BDRVVVFATState* s,
- long_file_name* lfn, direntry_t* direntry)
-{
- int i, j;
-
- if (!is_short_name(direntry))
- return 1;
-
- for (j = 7; j >= 0 && direntry->name[j] == ' '; j--);
- for (i = 0; i <= j; i++) {
- if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f)
- return -1;
- else if (s->downcase_short_names)
- lfn->name[i] = 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 <= ' ' || c > 0x7f) {
- 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';
-
- lfn->len = strlen((char*)lfn->name);
-
- return 0;
-}
-
-static inline uint32_t modified_fat_get(BDRVVVFATState* s,
- unsigned int cluster)
-{
- if (cluster < s->last_cluster_of_root_directory) {
- if (cluster + 1 == s->last_cluster_of_root_directory)
- return s->max_fat_value;
- else
- return cluster + 1;
- }
-
- if (s->fat_type==32) {
- uint32_t* entry=((uint32_t*)s->fat2)+cluster;
- return le32_to_cpu(*entry);
- } else if (s->fat_type==16) {
- uint16_t* entry=((uint16_t*)s->fat2)+cluster;
- return le16_to_cpu(*entry);
- } else {
- const uint8_t* x=s->fat2+cluster*3/2;
- return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
- }
-}
-
-static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num)
-{
- int was_modified = 0;
- int i, dummy;
-
- if (s->qcow == NULL)
- return 0;
-
- for (i = 0; !was_modified && i < s->sectors_per_cluster; i++)
- was_modified = bdrv_is_allocated(s->qcow,
- cluster2sector(s, cluster_num) + i, 1, &dummy);
-
- return was_modified;
-}
-
-static const char* get_basename(const char* path)
-{
- char* basename = strrchr(path, '/');
- if (basename == NULL)
- return path;
- else
- return basename + 1; /* strip '/' */
-}
-
-/*
- * The array s->used_clusters holds the states of the clusters. If it is
- * part of a file, it has bit 2 set, in case of a directory, bit 1. If it
- * was modified, bit 3 is set.
- * If any cluster is allocated, but not part of a file or directory, this
- * driver refuses to commit.
- */
-typedef enum {
- USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4
-} used_t;
-
-/*
- * get_cluster_count_for_direntry() not only determines how many clusters
- * are occupied by direntry, but also if it was renamed or modified.
- *
- * A file is thought to be renamed *only* if there already was a file with
- * exactly the same first cluster, but a different name.
- *
- * Further, the files/directories handled by this function are
- * assumed to be *not* deleted (and *only* those).
- */
-static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
- direntry_t* direntry, const char* path)
-{
- /*
- * This is a little bit tricky:
- * IF the guest OS just inserts a cluster into the file chain,
- * and leaves the rest alone, (i.e. the original file had clusters
- * 15 -> 16, but now has 15 -> 32 -> 16), then the following happens:
- *
- * - do_commit will write the cluster into the file at the given
- * offset, but
- *
- * - the cluster which is overwritten should be moved to a later
- * position in the file.
- *
- * I am not aware that any OS does something as braindead, but this
- * situation could happen anyway when not committing for a long time.
- * Just to be sure that this does not bite us, detect it, and copy the
- * contents of the clusters to-be-overwritten into the qcow.
- */
- int copy_it = 0;
- int was_modified = 0;
- int32_t ret = 0;
-
- uint32_t cluster_num = begin_of_direntry(direntry);
- uint32_t offset = 0;
- int first_mapping_index = -1;
- mapping_t* mapping = NULL;
- const char* basename2 = NULL;
-
- vvfat_close_current_file(s);
-
- /* the root directory */
- if (cluster_num == 0)
- return 0;
-
- /* write support */
- if (s->qcow) {
- basename2 = get_basename(path);
-
- mapping = find_mapping_for_cluster(s, cluster_num);
-
- if (mapping) {
- const char* basename;
-
- assert(mapping->mode & MODE_DELETED);
- mapping->mode &= ~MODE_DELETED;
-
- basename = get_basename(mapping->path);
-
- assert(mapping->mode & MODE_NORMAL);
-
- /* rename */
- if (strcmp(basename, basename2))
- schedule_rename(s, cluster_num, 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, dummy;
- /*
- * This is horribly inefficient, but that is okay, since
- * it is rarely executed, if at all.
- */
- int64_t offset = cluster2sector(s, cluster_num);
-
- vvfat_close_current_file(s);
- for (i = 0; i < s->sectors_per_cluster; i++) {
- if (!bdrv_is_allocated(s->qcow, offset + i, 1, &dummy)) {
- if (vvfat_read(s->bs, offset, s->cluster_buffer, 1)) {
- return -1;
- }
- if (bdrv_write(s->qcow, offset, s->cluster_buffer, 1)) {
- return -2;
- }
- }
- }
- }
- }
-
- ret++;
- if (s->used_clusters[cluster_num] & USED_ANY)
- return 0;
- s->used_clusters[cluster_num] = USED_FILE;
-
- cluster_num = modified_fat_get(s, cluster_num);
-
- if (fat_eof(s, cluster_num))
- return ret;
- else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16)
- return -1;
-
- offset += s->cluster_size;
- }
-}
-
-/*
- * This function looks at the modified data (qcow).
- * It returns 0 upon inconsistency or error, and the number of clusters
- * used by the directory, its subdirectories and their files.
- */
-static int check_directory_consistency(BDRVVVFATState *s,
- int cluster_num, const char* path)
-{
- int ret = 0;
- unsigned char* cluster = 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 !=
- (le32_to_cpu(direntries[i].size) + s->cluster_size
- - 1) / 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->first_sectors_number, s->fat2, s->sectors_per_fat);
- if (check) {
- fprintf(stderr, "Could not copy fat\n");
- return 0;
- }
- assert (s->used_clusters);
- for (i = 0; i < sector2cluster(s, s->sector_count); i++)
- s->used_clusters[i] &= ~USED_ANY;
-
- clear_commits(s);
-
- /* mark every mapped file/directory as deleted.
- * (check_directory_consistency() will unmark those still present). */
- if (s->qcow)
- for (i = 0; i < s->mapping.next; i++) {
- mapping_t* mapping = array_get(&(s->mapping), i);
- if (mapping->first_mapping_index < 0)
- mapping->mode |= MODE_DELETED;
- }
-
- used_clusters_count = check_directory_consistency(s, 0, s->path);
- if (used_clusters_count <= 0) {
- DLOG(fprintf(stderr, "problem in directory\n"));
- return 0;
- }
-
- check = s->last_cluster_of_root_directory;
- for (i = check; i < sector2cluster(s, s->sector_count); i++) {
- if (modified_fat_get(s, i)) {
- if(!s->used_clusters[i]) {
- DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i));
- return 0;
- }
- check++;
- }
-
- if (s->used_clusters[i] == USED_ALLOCATED) {
- /* allocated, but not used... */
- DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i));
- return 0;
- }
- }
-
- if (check != used_clusters_count)
- return 0;
-
- return used_clusters_count;
-}
-
-static inline void adjust_mapping_indices(BDRVVVFATState* s,
- int offset, int adjust)
-{
- int i;
-
- for (i = 0; i < s->mapping.next; i++) {
- mapping_t* mapping = array_get(&(s->mapping), i);
-
-#define ADJUST_MAPPING_INDEX(name) \
- if (mapping->name >= offset) \
- mapping->name += adjust
-
- ADJUST_MAPPING_INDEX(first_mapping_index);
- if (mapping->mode & MODE_DIRECTORY)
- ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index);
- }
-}
-
-/* insert or update mapping */
-static mapping_t* insert_mapping(BDRVVVFATState* s,
- uint32_t begin, uint32_t end)
-{
- /*
- * - find mapping where mapping->begin >= begin,
- * - if mapping->begin > begin: insert
- * - adjust all references to mappings!
- * - else: adjust
- * - replace name
- */
- int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next);
- mapping_t* mapping = NULL;
- mapping_t* first_mapping = array_get(&(s->mapping), 0);
-
- if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index))
- && mapping->begin < begin) {
- mapping->end = begin;
- index++;
- mapping = array_get(&(s->mapping), index);
- }
- if (index >= s->mapping.next || mapping->begin > begin) {
- mapping = array_insert(&(s->mapping), index, 1);
- mapping->path = NULL;
- adjust_mapping_indices(s, index, +1);
- }
-
- mapping->begin = begin;
- mapping->end = end;
-
-DLOG(mapping_t* next_mapping;
-assert(index + 1 >= s->mapping.next ||
-((next_mapping = array_get(&(s->mapping), index + 1)) &&
- next_mapping->begin >= end)));
-
- if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer)
- s->current_mapping = array_get(&(s->mapping),
- s->current_mapping - first_mapping);
-
- return mapping;
-}
-
-static int remove_mapping(BDRVVVFATState* s, int mapping_index)
-{
- mapping_t* mapping = array_get(&(s->mapping), mapping_index);
- mapping_t* first_mapping = array_get(&(s->mapping), 0);
-
- /* free mapping */
- if (mapping->first_mapping_index < 0) {
- 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, (rest_size + 0x1ff) / 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->drv->bdrv_make_empty) {
- s->qcow->drv->bdrv_make_empty(s->qcow);
- }
-
- memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
-
-DLOG(checkpoint());
- return 0;
-}
-
-static int try_commit(BDRVVVFATState* s)
-{
- vvfat_close_current_file(s);
-DLOG(checkpoint());
- if(!is_consistent(s))
- return -1;
- return do_commit(s);
-}
-
-static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
-{
- BDRVVVFATState *s = bs->opaque;
- int i, ret;
-
-DLOG(checkpoint());
-
- /* 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
- * - do not allow to write non-ASCII filenames
- */
-
- if (sector_num < s->first_sectors_number)
- return -1;
-
- for (i = sector2cluster(s, sector_num);
- i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
- mapping_t* mapping = find_mapping_for_cluster(s, i);
- if (mapping) {
- if (mapping->read_only) {
- fprintf(stderr, "Tried to write to write-protected file %s\n",
- mapping->path);
- return -1;
- }
-
- if (mapping->mode & MODE_DIRECTORY) {
- int begin = cluster2sector(s, i);
- int end = begin + s->sectors_per_cluster, k;
- int dir_index;
- const direntry_t* direntries;
- long_file_name lfn;
-
- lfn_init(&lfn);
-
- if (begin < sector_num)
- begin = sector_num;
- if (end > sector_num + nb_sectors)
- end = sector_num + nb_sectors;
- dir_index = mapping->dir_index +
- 0x10 * (begin - mapping->begin * s->sectors_per_cluster);
- direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num));
-
- for (k = 0; k < (end - begin) * 0x10; k++) {
- /* do not allow non-ASCII filenames */
- if (parse_long_name(&lfn, direntries + k) < 0) {
- fprintf(stderr, "Warning: non-ASCII filename\n");
- return -1;
- }
- /* no access to the direntry of a read-only file */
- else if (is_short_name(direntries+k) &&
- (direntries[k].attributes & 1)) {
- if (memcmp(direntries + k,
- array_get(&(s->directory), dir_index + k),
- sizeof(direntry_t))) {
- fprintf(stderr, "Warning: tried to write to write-protected file\n");
- return -1;
- }
- }
- }
- }
- i = mapping->end;
- } else
- i++;
- }
-
- /*
- * Use qcow backend. Commit later.
- */
-DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
- ret = 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 coroutine_fn int vvfat_co_write(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
-{
- int ret;
- BDRVVVFATState *s = bs->opaque;
- qemu_co_mutex_lock(&s->lock);
- ret = vvfat_write(bs, sector_num, buf, nb_sectors);
- qemu_co_mutex_unlock(&s->lock);
- 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)
-{
- BDRVVVFATState* s = bs->opaque;
- *n = s->sector_count - sector_num;
- if (*n > nb_sectors) {
- *n = nb_sectors;
- } else if (*n < 0) {
- return 0;
- }
- return BDRV_BLOCK_DATA;
-}
-
-static int write_target_commit(BlockDriverState *bs, int64_t sector_num,
- const uint8_t* buffer, int nb_sectors) {
- BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
- return try_commit(s);
-}
-
-static void write_target_close(BlockDriverState *bs) {
- BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
- bdrv_unref(s->qcow);
- g_free(s->qcow_filename);
-}
-
-static BlockDriver vvfat_write_target = {
- .format_name = "vvfat_write_target",
- .bdrv_write = write_target_commit,
- .bdrv_close = write_target_close,
-};
-
-static int enable_write_target(BDRVVVFATState *s, Error **errp)
-{
- 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;
- }
-
- s->qcow = NULL;
- options = qdict_new();
- qdict_put(options, "driver", qstring_from_str("qcow"));
- ret = bdrv_open(&s->qcow, s->qcow_filename, NULL, options,
- BDRV_O_RDWR | BDRV_O_NO_FLUSH, errp);
- if (ret < 0) {
- goto err;
- }
-
-#ifndef _WIN32
- unlink(s->qcow_filename);
-#endif
-
- backing = bdrv_new();
- bdrv_set_backing_hd(s->bs, backing);
- bdrv_unref(backing);
-
- s->bs->backing->bs->drv = &vvfat_write_target;
- s->bs->backing->bs->opaque = g_new(void *, 1);
- *(void**)s->bs->backing->bs->opaque = s;
-
- return 0;
-
-err:
- g_free(s->qcow_filename);
- s->qcow_filename = NULL;
- return ret;
-}
-
-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_close = vvfat_close,
-
- .bdrv_read = vvfat_co_read,
- .bdrv_write = vvfat_co_write,
- .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));
-#if 0
- if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf)
- fprintf(stderr, "Nonono!\n");
- mapping_t* mapping;
- direntry_t* direntry;
- assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next);
- assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next);
- if (vvv->mapping.next<47)
- return;
- assert((mapping = array_get(&(vvv->mapping), 47)));
- assert(mapping->dir_index < vvv->directory.next);
- direntry = array_get(&(vvv->directory), mapping->dir_index);
- assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0);
-#endif
-}
-#endif