| /* 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 <glib/gstdio.h> |
| #include "qapi/error.h" |
| #include "block/block_int.h" |
| #include "block/qdict.h" |
| #include "qemu/module.h" |
| #include "qemu/option.h" |
| #include "qemu/bswap.h" |
| #include "migration/blocker.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qstring.h" |
| #include "qemu/ctype.h" |
| #include "qemu/cutils.h" |
| #include "qemu/error-report.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); |
| |
| #else |
| |
| #define DLOG(a) |
| |
| #endif |
| |
| /* bootsector OEM name. see related compatibility problems at: |
| * https://jdebp.eu/FGA/volume-boot-block-oem-name-field.html |
| * http://seasip.info/Misc/oemid.html |
| */ |
| #define BOOTSECTOR_OEM_NAME "MSWIN4.1" |
| |
| #define DIR_DELETED 0xe5 |
| #define DIR_KANJI DIR_DELETED |
| #define DIR_KANJI_FAKE 0x05 |
| #define DIR_FREE 0x00 |
| |
| /* 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); |
| assert(array->pointer); |
| return array->pointer + index * array->item_size; |
| } |
| |
| static inline void 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); |
| assert(array->pointer); |
| memset(array->pointer + array->size, 0, new_size - array->size); |
| array->size = new_size; |
| array->next = index + 1; |
| } |
| } |
| |
| static inline void* array_get_next(array_t* array) { |
| unsigned int next = array->next; |
| |
| array_ensure_allocated(array, next); |
| array->next = next + 1; |
| return array_get(array, next); |
| } |
| |
| 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; |
| } |
| |
| static inline int array_remove_slice(array_t* array,int index, int count) |
| { |
| assert(index >=0); |
| assert(count > 0); |
| assert(index + count <= array->next); |
| |
| memmove(array->pointer + index * array->item_size, |
| array->pointer + (index + count) * array->item_size, |
| (array->next - index - count) * array->item_size); |
| |
| 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 reserved1; |
| uint8_t signature; |
| uint32_t id; |
| uint8_t volume_label[11]; |
| uint8_t fat_type[8]; |
| uint8_t ignored[0x1c0]; |
| } QEMU_PACKED fat16; |
| struct { |
| uint32_t sectors_per_fat; |
| uint16_t flags; |
| uint8_t major,minor; |
| uint32_t first_cluster_of_root_dir; |
| uint16_t info_sector; |
| uint16_t backup_boot_sector; |
| uint8_t reserved[12]; |
| uint8_t drive_number; |
| uint8_t reserved1; |
| uint8_t signature; |
| uint32_t id; |
| uint8_t volume_label[11]; |
| uint8_t fat_type[8]; |
| uint8_t ignored[0x1a4]; |
| } QEMU_PACKED fat32; |
| } u; |
| 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 |
| */ |
| 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_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]; |
| |
| int fat_type; /* 16 or 32 */ |
| array_t fat,directory,mapping; |
| char volume_label[11]; |
| |
| uint32_t offset_to_bootsector; /* 0 for floppy, 0x3f for disk */ |
| |
| 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; |
| 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; |
| uint32_t offset_to_root_dir; |
| |
| 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 */ |
| char* qcow_filename; |
| BdrvChild* 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->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 bool valid_filename(const unsigned char *name) |
| { |
| unsigned char c; |
| if (!strcmp((const char*)name, ".") || !strcmp((const char*)name, "..")) { |
| return false; |
| } |
| for (; (c = *name); name++) { |
| if (!((c >= '0' && c <= '9') || |
| (c >= 'A' && c <= 'Z') || |
| (c >= 'a' && c <= 'z') || |
| c > 127 || |
| strchr(" $%'-_@~`!(){}^#&.+,;=[]", c) != NULL)) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static uint8_t to_valid_short_char(gunichar c) |
| { |
| c = g_unichar_toupper(c); |
| if ((c >= '0' && c <= '9') || |
| (c >= 'A' && c <= 'Z') || |
| strchr("$%'-_@~`!(){}^#&", c) != NULL) { |
| 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 int32_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) { |
| char *path = mapping->path; |
| mapping->begin = cluster; |
| if(read_directory(s, i)) { |
| error_setg(errp, "Could not read directory %s", 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; |
| int ret; |
| |
| #ifdef DEBUG |
| vvv = s; |
| #endif |
| |
| opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
| if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| 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; |
| |
| DLOG(fprintf(stderr, "vvfat %s chs %d,%d,%d\n", |
| dirname, cyls, heads, secs)); |
| |
| s->sector_count = cyls * heads * secs - s->offset_to_bootsector; |
| bs->total_sectors = cyls * heads * secs; |
| |
| 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 { |
| ret = bdrv_apply_auto_read_only(bs, NULL, errp); |
| if (ret < 0) { |
| goto fail; |
| } |
| } |
| |
| 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, errp); |
| if (ret < 0) { |
| 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); |
| |
| qemu_opts_del(opts); |
| |
| return 0; |
| |
| fail: |
| g_free(s->qcow_filename); |
| s->qcow_filename = NULL; |
| g_free(s->cluster_buffer); |
| s->cluster_buffer = NULL; |
| g_free(s->used_clusters); |
| s->used_clusters = NULL; |
| |
| 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_old(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=%u size=%u\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 = %u, %u, dir_index = %u, " |
| "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 = %u\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_pread(s->qcow, sector_num * BDRV_SECTOR_SIZE, n, |
| buf + i * 0x200, 0) < 0) { |
| 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, int64_t offset, int64_t bytes, |
| QEMUIOVector *qiov, BdrvRequestFlags 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(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)); |
| assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE)); |
| |
| 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 (%u 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; |
| 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 != s->cluster_size |
| * ((cluster_num - mapping->begin) |
| + mapping->info.file.offset)) { |
| /* 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; |
| } |
| assert(mapping->first_mapping_index == -1 |
| || mapping->info.file.offset > 0); |
| |
| /* 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_pwrite(s->qcow, offset * BDRV_SECTOR_SIZE, |
| BDRV_SECTOR_SIZE, s->cluster_buffer, |
| 0); |
| if (res < 0) { |
| 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 (!valid_filename(lfn.name)) { |
| fprintf(stderr, "Invalid file name\n"); |
| goto fail; |
| } |
| 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_pread 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; |
| int first_dir_index; |
| int ret, i; |
| uint32_t c; |
| |
| 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)); |
| |
| DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", |
| mapping->path, parent_mapping_index)); |
| |
| current_dir_index = mapping->info.dir.first_dir_index; |
| first_dir_index = current_dir_index; |
| 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); |
| if (mapping == NULL) { |
| return -1; |
| } |
| 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; |
| uint32_t i; |
| int fd = 0; |
| |
| assert(offset < size); |
| assert((offset % s->cluster_size) == 0); |
| |
| if (mapping == NULL) { |
| return -1; |
| } |
| |
| for (i = 0; i < offset; i += s->cluster_size) { |
| c = modified_fat_get(s, c); |
| } |
| |
| fd = qemu_open_old(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666); |
| if (fd < 0) { |
| fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path, |
| strerror(errno), errno); |
| return fd; |
| } |
| if (offset > 0) { |
| if (lseek(fd, offset, SEEK_SET) != offset) { |
| qemu_close(fd); |
| return -3; |
| } |
| } |
| |
| cluster = g_malloc(s->cluster_size); |
| |
| 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 (%u, %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; |
| |
| if (mapping == NULL) { |
| return -1; |
| } |
| 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))) { |
| int l; |
| char *new_path; |
| mapping_t* m = find_mapping_for_cluster(s, |
| begin_of_direntry(d)); |
| if (m == NULL) { |
| return -1; |
| } |
| l = strlen(m->path); |
| 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; |
| |
| if (g_mkdir(commit->path, 0755)) { |
| return -5; |
| } |
| |
| 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_pread) |
| * - mark all filenames corresponding to mappings as deleted |
| * - recurse direntries from root (using bs->bdrv_pread) |
| * - 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_pread) */ |
| memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat); |
| |
| /* recurse direntries from root (using bs->bdrv_pread) */ |
| 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; |
| } |
| |
| bdrv_make_empty(s->qcow, NULL); |
| |
| 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; |
| int first_cluster, last_cluster; |
| |
| DLOG(checkpoint()); |
| |
| /* Check if we're operating in read-only mode */ |
| if (s->qcow == NULL) { |
| return -EACCES; |
| } |
| |
| vvfat_close_current_file(s); |
| |
| if (sector_num == s->offset_to_bootsector && nb_sectors == 1) { |
| /* |
| * Write on bootsector. Allow only changing the reserved1 field, |
| * used to mark volume dirtiness |
| */ |
| unsigned char *bootsector = s->first_sectors |
| + s->offset_to_bootsector * 0x200; |
| /* |
| * LATER TODO: if FAT32, this is wrong (see init_directories(), |
| * which always creates a FAT16 bootsector) |
| */ |
| const int reserved1_offset = offsetof(bootsector_t, u.fat16.reserved1); |
| |
| for (i = 0; i < 0x200; i++) { |
| if (i != reserved1_offset && bootsector[i] != buf[i]) { |
| fprintf(stderr, "Tried to write to protected bootsector\n"); |
| return -1; |
| } |
| } |
| |
| /* Update bootsector with the only updatable byte, and return success */ |
| bootsector[reserved1_offset] = buf[reserved1_offset]; |
| return 0; |
| } |
| |
| /* |
| * Some sanity checks: |
| * - do not allow writing to the boot sector |
| */ |
| if (sector_num < s->offset_to_fat) |
| return -1; |
| |
| /* |
| * Values will be negative for writes to the FAT, which is located before |
| * the root directory. |
| */ |
| first_cluster = sector2cluster(s, sector_num); |
| last_cluster = sector2cluster(s, sector_num + nb_sectors - 1); |
| |
| for (i = first_cluster; i <= last_cluster;) { |
| mapping_t *mapping = NULL; |
| |
| if (i >= 0) { |
| 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_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE, buf, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error writing to qcow backend\n"); |
| return ret; |
| } |
| |
| for (i = first_cluster; i <= last_cluster; 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, int64_t offset, int64_t bytes, |
| QEMUIOVector *qiov, BdrvRequestFlags 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(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)); |
| assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE)); |
| |
| 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 int coroutine_fn vvfat_co_block_status(BlockDriverState *bs, |
| bool want_zero, int64_t offset, |
| int64_t bytes, int64_t *n, |
| int64_t *map, |
| BlockDriverState **file) |
| { |
| *n = bytes; |
| return BDRV_BLOCK_DATA; |
| } |
| |
| static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format, |
| int *child_flags, QDict *child_options, |
| int parent_flags, QDict *parent_options) |
| { |
| qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off"); |
| qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
| } |
| |
| static BdrvChildClass child_vvfat_qcow; |
| |
| static int enable_write_target(BlockDriverState *bs, Error **errp) |
| { |
| BDRVVVFATState *s = bs->opaque; |
| BlockDriver *bdrv_qcow = NULL; |
| QemuOpts *opts = NULL; |
| int ret; |
| int size = sector2cluster(s, s->sector_count); |
| QDict *options; |
| |
| s->used_clusters = g_malloc0(size); |
| |
| array_init(&(s->commits), sizeof(commit_t)); |
| |
| s->qcow_filename = create_tmp_file(errp); |
| if (!s->qcow_filename) { |
| ret = -ENOENT; |
| 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, |
| bs->total_sectors * BDRV_SECTOR_SIZE, &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, |
| BDRV_CHILD_DATA | BDRV_CHILD_METADATA, |
| false, errp); |
| qobject_unref(options); |
| if (!s->qcow) { |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| #ifndef _WIN32 |
| unlink(s->qcow_filename); |
| #endif |
| |
| return 0; |
| |
| err: |
| return ret; |
| } |
| |
| static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c, |
| BdrvChildRole role, |
| BlockReopenQueue *reopen_queue, |
| uint64_t perm, uint64_t shared, |
| uint64_t *nperm, uint64_t *nshared) |
| { |
| assert(role & BDRV_CHILD_DATA); |
| /* 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; |
| } |
| |
| 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 const char *const vvfat_strong_runtime_opts[] = { |
| "dir", |
| "fat-type", |
| "floppy", |
| "label", |
| "rw", |
| |
| NULL |
| }; |
| |
| 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_block_status = vvfat_co_block_status, |
| |
| .strong_runtime_opts = vvfat_strong_runtime_opts, |
| }; |
| |
| static void bdrv_vvfat_init(void) |
| { |
| child_vvfat_qcow = child_of_bds; |
| child_vvfat_qcow.inherit_options = vvfat_qcow_options; |
| 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 |