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Annotation of qemu/block/parallels.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Block driver for Parallels disk image format
        !             3:  *
        !             4:  * Copyright (c) 2007 Alex Beregszaszi
        !             5:  *
        !             6:  * This code is based on comparing different disk images created by Parallels.
        !             7:  *
        !             8:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             9:  * of this software and associated documentation files (the "Software"), to deal
        !            10:  * in the Software without restriction, including without limitation the rights
        !            11:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            12:  * copies of the Software, and to permit persons to whom the Software is
        !            13:  * furnished to do so, subject to the following conditions:
        !            14:  *
        !            15:  * The above copyright notice and this permission notice shall be included in
        !            16:  * all copies or substantial portions of the Software.
        !            17:  *
        !            18:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            19:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            20:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            21:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            22:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            23:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            24:  * THE SOFTWARE.
        !            25:  */
        !            26: #include "qemu-common.h"
        !            27: #include "block_int.h"
        !            28: #include "module.h"
        !            29: 
        !            30: /**************************************************************/
        !            31: 
        !            32: #define HEADER_MAGIC "WithoutFreeSpace"
        !            33: #define HEADER_VERSION 2
        !            34: #define HEADER_SIZE 64
        !            35: 
        !            36: // always little-endian
        !            37: struct parallels_header {
        !            38:     char magic[16]; // "WithoutFreeSpace"
        !            39:     uint32_t version;
        !            40:     uint32_t heads;
        !            41:     uint32_t cylinders;
        !            42:     uint32_t tracks;
        !            43:     uint32_t catalog_entries;
        !            44:     uint32_t nb_sectors;
        !            45:     char padding[24];
        !            46: } __attribute__((packed));
        !            47: 
        !            48: typedef struct BDRVParallelsState {
        !            49:     int fd;
        !            50: 
        !            51:     uint32_t *catalog_bitmap;
        !            52:     int catalog_size;
        !            53: 
        !            54:     int tracks;
        !            55: } BDRVParallelsState;
        !            56: 
        !            57: static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
        !            58: {
        !            59:     const struct parallels_header *ph = (const void *)buf;
        !            60: 
        !            61:     if (buf_size < HEADER_SIZE)
        !            62:        return 0;
        !            63: 
        !            64:     if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
        !            65:        (le32_to_cpu(ph->version) == HEADER_VERSION))
        !            66:        return 100;
        !            67: 
        !            68:     return 0;
        !            69: }
        !            70: 
        !            71: static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
        !            72: {
        !            73:     BDRVParallelsState *s = bs->opaque;
        !            74:     int fd, i;
        !            75:     struct parallels_header ph;
        !            76: 
        !            77:     fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
        !            78:     if (fd < 0) {
        !            79:         fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
        !            80:         if (fd < 0)
        !            81:             return -1;
        !            82:     }
        !            83: 
        !            84:     bs->read_only = 1; // no write support yet
        !            85: 
        !            86:     s->fd = fd;
        !            87: 
        !            88:     if (read(fd, &ph, sizeof(ph)) != sizeof(ph))
        !            89:         goto fail;
        !            90: 
        !            91:     if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
        !            92:        (le32_to_cpu(ph.version) != HEADER_VERSION)) {
        !            93:         goto fail;
        !            94:     }
        !            95: 
        !            96:     bs->total_sectors = le32_to_cpu(ph.nb_sectors);
        !            97: 
        !            98:     if (lseek(s->fd, 64, SEEK_SET) != 64)
        !            99:        goto fail;
        !           100: 
        !           101:     s->tracks = le32_to_cpu(ph.tracks);
        !           102: 
        !           103:     s->catalog_size = le32_to_cpu(ph.catalog_entries);
        !           104:     s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
        !           105:     if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
        !           106:        s->catalog_size * 4)
        !           107:        goto fail;
        !           108:     for (i = 0; i < s->catalog_size; i++)
        !           109:        le32_to_cpus(&s->catalog_bitmap[i]);
        !           110: 
        !           111:     return 0;
        !           112: fail:
        !           113:     if (s->catalog_bitmap)
        !           114:        qemu_free(s->catalog_bitmap);
        !           115:     close(fd);
        !           116:     return -1;
        !           117: }
        !           118: 
        !           119: static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
        !           120: {
        !           121:     BDRVParallelsState *s = bs->opaque;
        !           122:     uint32_t index, offset, position;
        !           123: 
        !           124:     index = sector_num / s->tracks;
        !           125:     offset = sector_num % s->tracks;
        !           126: 
        !           127:     // not allocated
        !           128:     if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
        !           129:        return -1;
        !           130: 
        !           131:     position = (s->catalog_bitmap[index] + offset) * 512;
        !           132: 
        !           133: //    fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
        !           134: //     sector_num, index, offset, s->catalog_bitmap[index], position);
        !           135: 
        !           136:     if (lseek(s->fd, position, SEEK_SET) != position)
        !           137:        return -1;
        !           138: 
        !           139:     return 0;
        !           140: }
        !           141: 
        !           142: static int parallels_read(BlockDriverState *bs, int64_t sector_num,
        !           143:                     uint8_t *buf, int nb_sectors)
        !           144: {
        !           145:     BDRVParallelsState *s = bs->opaque;
        !           146: 
        !           147:     while (nb_sectors > 0) {
        !           148:        if (!seek_to_sector(bs, sector_num)) {
        !           149:            if (read(s->fd, buf, 512) != 512)
        !           150:                return -1;
        !           151:        } else
        !           152:             memset(buf, 0, 512);
        !           153:         nb_sectors--;
        !           154:         sector_num++;
        !           155:         buf += 512;
        !           156:     }
        !           157:     return 0;
        !           158: }
        !           159: 
        !           160: static void parallels_close(BlockDriverState *bs)
        !           161: {
        !           162:     BDRVParallelsState *s = bs->opaque;
        !           163:     qemu_free(s->catalog_bitmap);
        !           164:     close(s->fd);
        !           165: }
        !           166: 
        !           167: static BlockDriver bdrv_parallels = {
        !           168:     .format_name       = "parallels",
        !           169:     .instance_size     = sizeof(BDRVParallelsState),
        !           170:     .bdrv_probe                = parallels_probe,
        !           171:     .bdrv_open         = parallels_open,
        !           172:     .bdrv_read         = parallels_read,
        !           173:     .bdrv_close                = parallels_close,
        !           174: };
        !           175: 
        !           176: static void bdrv_parallels_init(void)
        !           177: {
        !           178:     bdrv_register(&bdrv_parallels);
        !           179: }
        !           180: 
        !           181: block_init(bdrv_parallels_init);

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