VMDK4 write support - fixed packing of VMDK4Header (Filip Navara)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1406 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
6d82d04a49
commit
ff1afc72f2
91
block-vmdk.c
91
block-vmdk.c
@ -2,6 +2,7 @@
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* Block driver for the VMDK format
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*
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* Copyright (c) 2004 Fabrice Bellard
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* Copyright (c) 2005 Filip Navara
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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@ -24,9 +25,6 @@
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#include "vl.h"
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#include "block_int.h"
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/* XXX: this code is untested */
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/* XXX: add write support */
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#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
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#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
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@ -56,14 +54,16 @@ typedef struct {
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int64_t grain_offset;
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char filler[1];
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char check_bytes[4];
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} VMDK4Header;
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} __attribute__((packed)) VMDK4Header;
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#define L2_CACHE_SIZE 16
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typedef struct BDRVVmdkState {
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int fd;
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int64_t l1_table_offset;
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int64_t l1_backup_table_offset;
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uint32_t *l1_table;
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uint32_t *l1_backup_table;
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unsigned int l1_size;
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uint32_t l1_entry_sectors;
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@ -96,9 +96,13 @@ static int vmdk_open(BlockDriverState *bs, const char *filename)
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uint32_t magic;
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int l1_size;
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fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (fd < 0)
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return -1;
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fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
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if (fd < 0) {
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fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (fd < 0)
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return -1;
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bs->read_only = 1;
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}
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if (read(fd, &magic, sizeof(magic)) != sizeof(magic))
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goto fail;
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magic = be32_to_cpu(magic);
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@ -111,7 +115,8 @@ static int vmdk_open(BlockDriverState *bs, const char *filename)
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s->l2_size = 1 << 9;
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s->l1_size = 1 << 6;
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bs->total_sectors = le32_to_cpu(header.disk_sectors);
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s->l1_table_offset = le32_to_cpu(header.l1dir_offset) * 512;
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s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
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s->l1_backup_table_offset = 0;
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s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
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} else if (magic == VMDK4_MAGIC) {
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VMDK4Header header;
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@ -126,7 +131,8 @@ static int vmdk_open(BlockDriverState *bs, const char *filename)
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goto fail;
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s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
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/ s->l1_entry_sectors;
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s->l1_table_offset = le64_to_cpu(header.rgd_offset) * 512;
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s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
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s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
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} else {
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goto fail;
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}
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@ -143,14 +149,26 @@ static int vmdk_open(BlockDriverState *bs, const char *filename)
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le32_to_cpus(&s->l1_table[i]);
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}
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if (s->l1_backup_table_offset) {
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s->l1_backup_table = qemu_malloc(l1_size);
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if (!s->l1_backup_table)
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goto fail;
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if (lseek(fd, s->l1_backup_table_offset, SEEK_SET) == -1)
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goto fail;
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if (read(fd, s->l1_backup_table, l1_size) != l1_size)
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goto fail;
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for(i = 0; i < s->l1_size; i++) {
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le32_to_cpus(&s->l1_backup_table[i]);
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}
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}
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s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
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if (!s->l2_cache)
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goto fail;
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s->fd = fd;
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/* XXX: currently only read only */
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bs->read_only = 1;
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return 0;
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fail:
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qemu_free(s->l1_backup_table);
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qemu_free(s->l1_table);
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qemu_free(s->l2_cache);
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close(fd);
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@ -158,12 +176,12 @@ static int vmdk_open(BlockDriverState *bs, const char *filename)
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}
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static uint64_t get_cluster_offset(BlockDriverState *bs,
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uint64_t offset)
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uint64_t offset, int allocate)
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{
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BDRVVmdkState *s = bs->opaque;
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unsigned int l1_index, l2_offset, l2_index;
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int min_index, i, j;
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uint32_t min_count, *l2_table;
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uint32_t min_count, *l2_table, tmp;
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uint64_t cluster_offset;
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l1_index = (offset >> 9) / s->l1_entry_sectors;
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@ -172,7 +190,6 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
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l2_offset = s->l1_table[l1_index];
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if (!l2_offset)
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return 0;
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for(i = 0; i < L2_CACHE_SIZE; i++) {
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if (l2_offset == s->l2_cache_offsets[i]) {
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/* increment the hit count */
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@ -204,6 +221,26 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
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found:
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l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
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cluster_offset = le32_to_cpu(l2_table[l2_index]);
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if (!cluster_offset) {
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if (!allocate)
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return 0;
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cluster_offset = lseek(s->fd, 0, SEEK_END);
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ftruncate(s->fd, cluster_offset + (s->cluster_sectors << 9));
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cluster_offset >>= 9;
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/* update L2 table */
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tmp = cpu_to_le32(cluster_offset);
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l2_table[l2_index] = tmp;
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lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET);
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if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
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return 0;
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/* update backup L2 table */
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if (s->l1_backup_table_offset != 0) {
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l2_offset = s->l1_backup_table[l1_index];
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lseek(s->fd, ((int64_t)l2_offset * 512) + (l2_index * sizeof(tmp)), SEEK_SET);
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if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
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return 0;
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}
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}
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cluster_offset <<= 9;
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return cluster_offset;
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}
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@ -215,7 +252,7 @@ static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int index_in_cluster, n;
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uint64_t cluster_offset;
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cluster_offset = get_cluster_offset(bs, sector_num << 9);
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cluster_offset = get_cluster_offset(bs, sector_num << 9, 0);
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index_in_cluster = sector_num % s->cluster_sectors;
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n = s->cluster_sectors - index_in_cluster;
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if (n > nb_sectors)
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@ -232,7 +269,7 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
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uint64_t cluster_offset;
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while (nb_sectors > 0) {
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cluster_offset = get_cluster_offset(bs, sector_num << 9);
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cluster_offset = get_cluster_offset(bs, sector_num << 9, 0);
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index_in_cluster = sector_num % s->cluster_sectors;
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n = s->cluster_sectors - index_in_cluster;
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if (n > nb_sectors)
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@ -255,7 +292,27 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
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static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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{
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return -1;
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BDRVVmdkState *s = bs->opaque;
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int ret, index_in_cluster, n;
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uint64_t cluster_offset;
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while (nb_sectors > 0) {
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index_in_cluster = sector_num & (s->cluster_sectors - 1);
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n = s->cluster_sectors - index_in_cluster;
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if (n > nb_sectors)
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n = nb_sectors;
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cluster_offset = get_cluster_offset(bs, sector_num << 9, 1);
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if (!cluster_offset)
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return -1;
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lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
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ret = write(s->fd, buf, n * 512);
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if (ret != n * 512)
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return -1;
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nb_sectors -= n;
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sector_num += n;
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buf += n * 512;
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}
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return 0;
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}
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static void vmdk_close(BlockDriverState *bs)
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