block: Remove obsolete files.
The Android emulator doesn't use the COW and QCOW block formats.
QCOW2 is required for snapshot support at the moment though, so
keep it here.
Change-Id: Ic27c7d4c45d67e8c71b3b495348ad4d843a7e9b8
diff --git a/Makefile.common b/Makefile.common
index 7101acb..69961be 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -634,7 +634,6 @@
BLOCK_SOURCES += \
block.c \
blockdev.c \
- block/qcow.c \
block/qcow2.c \
block/qcow2-refcount.c \
block/qcow2-snapshot.c \
diff --git a/block/cow.c b/block/cow.c
deleted file mode 100644
index cce970e..0000000
--- a/block/cow.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/*
- * Block driver for the COW format
- *
- * Copyright (c) 2004 Fabrice Bellard
- *
- * 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-common.h"
-#include "block/block_int.h"
-#include "qemu/module.h"
-
-/**************************************************************/
-/* COW block driver using file system holes */
-
-/* user mode linux compatible COW file */
-#define COW_MAGIC 0x4f4f4f4d /* MOOO */
-#define COW_VERSION 2
-
-struct cow_header_v2 {
- uint32_t magic;
- uint32_t version;
- char backing_file[1024];
- int32_t mtime;
- uint64_t size;
- uint32_t sectorsize;
-};
-
-typedef struct BDRVCowState {
- int64_t cow_sectors_offset;
-} BDRVCowState;
-
-static int cow_probe(const uint8_t *buf, int buf_size, const char *filename)
-{
- const struct cow_header_v2 *cow_header = (const void *)buf;
-
- if (buf_size >= sizeof(struct cow_header_v2) &&
- be32_to_cpu(cow_header->magic) == COW_MAGIC &&
- be32_to_cpu(cow_header->version) == COW_VERSION)
- return 100;
- else
- return 0;
-}
-
-static int cow_open(BlockDriverState *bs, int flags)
-{
- BDRVCowState *s = bs->opaque;
- struct cow_header_v2 cow_header;
- int bitmap_size;
- int64_t size;
-
- /* see if it is a cow image */
- if (bdrv_pread(bs->file, 0, &cow_header, sizeof(cow_header)) !=
- sizeof(cow_header)) {
- goto fail;
- }
-
- if (be32_to_cpu(cow_header.magic) != COW_MAGIC ||
- be32_to_cpu(cow_header.version) != COW_VERSION) {
- goto fail;
- }
-
- /* cow image found */
- size = be64_to_cpu(cow_header.size);
- bs->total_sectors = size / 512;
-
- pstrcpy(bs->backing_file, sizeof(bs->backing_file),
- cow_header.backing_file);
-
- bitmap_size = ((bs->total_sectors + 7) >> 3) + sizeof(cow_header);
- s->cow_sectors_offset = (bitmap_size + 511) & ~511;
- return 0;
- fail:
- return -1;
-}
-
-/*
- * XXX(hch): right now these functions are extremly ineffcient.
- * We should just read the whole bitmap we'll need in one go instead.
- */
-static inline int cow_set_bit(BlockDriverState *bs, int64_t bitnum)
-{
- uint64_t offset = sizeof(struct cow_header_v2) + bitnum / 8;
- uint8_t bitmap;
- int ret;
-
- ret = bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap));
- if (ret < 0) {
- return ret;
- }
-
- bitmap |= (1 << (bitnum % 8));
-
- ret = bdrv_pwrite_sync(bs->file, offset, &bitmap, sizeof(bitmap));
- if (ret < 0) {
- return ret;
- }
- return 0;
-}
-
-static inline int is_bit_set(BlockDriverState *bs, int64_t bitnum)
-{
- uint64_t offset = sizeof(struct cow_header_v2) + bitnum / 8;
- uint8_t bitmap;
- int ret;
-
- ret = bdrv_pread(bs->file, offset, &bitmap, sizeof(bitmap));
- if (ret < 0) {
- return ret;
- }
-
- return !!(bitmap & (1 << (bitnum % 8)));
-}
-
-/* Return true if first block has been changed (ie. current version is
- * in COW file). Set the number of continuous blocks for which that
- * is true. */
-static int cow_is_allocated(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, int *num_same)
-{
- int changed;
-
- if (nb_sectors == 0) {
- *num_same = nb_sectors;
- return 0;
- }
-
- changed = is_bit_set(bs, sector_num);
- if (changed < 0) {
- return 0; /* XXX: how to return I/O errors? */
- }
-
- for (*num_same = 1; *num_same < nb_sectors; (*num_same)++) {
- if (is_bit_set(bs, sector_num + *num_same) != changed)
- break;
- }
-
- return changed;
-}
-
-static int cow_update_bitmap(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors)
-{
- int error = 0;
- int i;
-
- for (i = 0; i < nb_sectors; i++) {
- error = cow_set_bit(bs, sector_num + i);
- if (error) {
- break;
- }
- }
-
- return error;
-}
-
-static int cow_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
-{
- BDRVCowState *s = bs->opaque;
- int ret, n;
-
- while (nb_sectors > 0) {
- if (cow_is_allocated(bs, sector_num, nb_sectors, &n)) {
- ret = bdrv_pread(bs->file,
- s->cow_sectors_offset + sector_num * 512,
- buf, n * 512);
- if (ret != n * 512)
- return -1;
- } else {
- if (bs->backing_hd) {
- /* read from the base image */
- ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
- if (ret < 0)
- return -1;
- } else {
- memset(buf, 0, n * 512);
- }
- }
- nb_sectors -= n;
- sector_num += n;
- buf += n * 512;
- }
- return 0;
-}
-
-static int cow_write(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
-{
- BDRVCowState *s = bs->opaque;
- int ret;
-
- ret = bdrv_pwrite(bs->file, s->cow_sectors_offset + sector_num * 512,
- buf, nb_sectors * 512);
- if (ret != nb_sectors * 512)
- return -1;
-
- return cow_update_bitmap(bs, sector_num, nb_sectors);
-}
-
-static void cow_close(BlockDriverState *bs)
-{
-}
-
-static int cow_create(const char *filename, QEMUOptionParameter *options)
-{
- int fd, cow_fd;
- struct cow_header_v2 cow_header;
- struct stat st;
- int64_t image_sectors = 0;
- const char *image_filename = NULL;
- int ret;
-
- /* Read out options */
- while (options && options->name) {
- if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
- image_sectors = options->value.n / 512;
- } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
- image_filename = options->value.s;
- }
- options++;
- }
-
- cow_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
- 0644);
- if (cow_fd < 0)
- return -errno;
- memset(&cow_header, 0, sizeof(cow_header));
- cow_header.magic = cpu_to_be32(COW_MAGIC);
- cow_header.version = cpu_to_be32(COW_VERSION);
- if (image_filename) {
- /* Note: if no file, we put a dummy mtime */
- cow_header.mtime = cpu_to_be32(0);
-
- fd = open(image_filename, O_RDONLY | O_BINARY);
- if (fd < 0) {
- close(cow_fd);
- goto mtime_fail;
- }
- if (fstat(fd, &st) != 0) {
- close(fd);
- goto mtime_fail;
- }
- close(fd);
- cow_header.mtime = cpu_to_be32(st.st_mtime);
- mtime_fail:
- pstrcpy(cow_header.backing_file, sizeof(cow_header.backing_file),
- image_filename);
- }
- cow_header.sectorsize = cpu_to_be32(512);
- cow_header.size = cpu_to_be64(image_sectors * 512);
- ret = qemu_write_full(cow_fd, &cow_header, sizeof(cow_header));
- if (ret != sizeof(cow_header)) {
- ret = -errno;
- goto exit;
- }
-
- /* resize to include at least all the bitmap */
- ret = ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3));
- if (ret) {
- ret = -errno;
- goto exit;
- }
-
-exit:
- close(cow_fd);
- return ret;
-}
-
-static void cow_flush(BlockDriverState *bs)
-{
- bdrv_flush(bs->file);
-}
-
-static QEMUOptionParameter cow_create_options[] = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = OPT_SIZE,
- .help = "Virtual disk size"
- },
- {
- .name = BLOCK_OPT_BACKING_FILE,
- .type = OPT_STRING,
- .help = "File name of a base image"
- },
- { NULL }
-};
-
-static BlockDriver bdrv_cow = {
- .format_name = "cow",
- .instance_size = sizeof(BDRVCowState),
- .bdrv_probe = cow_probe,
- .bdrv_open = cow_open,
- .bdrv_read = cow_read,
- .bdrv_write = cow_write,
- .bdrv_close = cow_close,
- .bdrv_create = cow_create,
- .bdrv_flush = cow_flush,
- .bdrv_is_allocated = cow_is_allocated,
-
- .create_options = cow_create_options,
-};
-
-static void bdrv_cow_init(void)
-{
- bdrv_register(&bdrv_cow);
-}
-
-block_init(bdrv_cow_init);
diff --git a/block/qcow.c b/block/qcow.c
deleted file mode 100644
index 7b22d32..0000000
--- a/block/qcow.c
+++ /dev/null
@@ -1,977 +0,0 @@
-/*
- * Block driver for the QCOW format
- *
- * Copyright (c) 2004-2006 Fabrice Bellard
- *
- * 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-common.h"
-#include "block/block_int.h"
-#include "qemu/iov.h"
-#include "qemu/module.h"
-#include <zlib.h>
-#include "qemu/aes.h"
-
-/**************************************************************/
-/* QEMU COW block driver with compression and encryption support */
-
-#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
-#define QCOW_VERSION 1
-
-#define QCOW_CRYPT_NONE 0
-#define QCOW_CRYPT_AES 1
-
-#define QCOW_OFLAG_COMPRESSED (1LL << 63)
-
-typedef struct QCowHeader {
- uint32_t magic;
- uint32_t version;
- uint64_t backing_file_offset;
- uint32_t backing_file_size;
- uint32_t mtime;
- uint64_t size; /* in bytes */
- uint8_t cluster_bits;
- uint8_t l2_bits;
- uint32_t crypt_method;
- uint64_t l1_table_offset;
-} QCowHeader;
-
-#define L2_CACHE_SIZE 16
-
-typedef struct BDRVQcowState {
- BlockDriverState *hd;
- int cluster_bits;
- int cluster_size;
- int cluster_sectors;
- int l2_bits;
- int l2_size;
- int l1_size;
- uint64_t cluster_offset_mask;
- uint64_t l1_table_offset;
- uint64_t *l1_table;
- uint64_t *l2_cache;
- uint64_t l2_cache_offsets[L2_CACHE_SIZE];
- uint32_t l2_cache_counts[L2_CACHE_SIZE];
- uint8_t *cluster_cache;
- uint8_t *cluster_data;
- uint64_t cluster_cache_offset;
- uint32_t crypt_method; /* current crypt method, 0 if no key yet */
- uint32_t crypt_method_header;
- AES_KEY aes_encrypt_key;
- AES_KEY aes_decrypt_key;
-} BDRVQcowState;
-
-static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
-
-static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
-{
- const QCowHeader *cow_header = (const void *)buf;
-
- if (buf_size >= sizeof(QCowHeader) &&
- be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
- be32_to_cpu(cow_header->version) == QCOW_VERSION)
- return 100;
- else
- return 0;
-}
-
-static int qcow_open(BlockDriverState *bs, int flags)
-{
- BDRVQcowState *s = bs->opaque;
- int len, i, shift;
- QCowHeader header;
-
- if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header))
- goto fail;
- be32_to_cpus(&header.magic);
- be32_to_cpus(&header.version);
- be64_to_cpus(&header.backing_file_offset);
- be32_to_cpus(&header.backing_file_size);
- be32_to_cpus(&header.mtime);
- be64_to_cpus(&header.size);
- be32_to_cpus(&header.crypt_method);
- be64_to_cpus(&header.l1_table_offset);
-
- if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
- goto fail;
- if (header.size <= 1 || header.cluster_bits < 9)
- goto fail;
- if (header.crypt_method > QCOW_CRYPT_AES)
- goto fail;
- s->crypt_method_header = header.crypt_method;
- if (s->crypt_method_header)
- bs->encrypted = 1;
- s->cluster_bits = header.cluster_bits;
- s->cluster_size = 1 << s->cluster_bits;
- s->cluster_sectors = 1 << (s->cluster_bits - 9);
- s->l2_bits = header.l2_bits;
- s->l2_size = 1 << s->l2_bits;
- bs->total_sectors = header.size / 512;
- s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1;
-
- /* read the level 1 table */
- shift = s->cluster_bits + s->l2_bits;
- s->l1_size = (header.size + (1LL << shift) - 1) >> shift;
-
- s->l1_table_offset = header.l1_table_offset;
- s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t));
- if (!s->l1_table)
- goto fail;
- if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
- s->l1_size * sizeof(uint64_t))
- goto fail;
- for(i = 0;i < s->l1_size; i++) {
- be64_to_cpus(&s->l1_table[i]);
- }
- /* alloc L2 cache */
- s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
- if (!s->l2_cache)
- goto fail;
- s->cluster_cache = g_malloc(s->cluster_size);
- if (!s->cluster_cache)
- goto fail;
- s->cluster_data = g_malloc(s->cluster_size);
- if (!s->cluster_data)
- goto fail;
- s->cluster_cache_offset = -1;
-
- /* read the backing file name */
- if (header.backing_file_offset != 0) {
- len = header.backing_file_size;
- if (len > 1023)
- len = 1023;
- if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
- goto fail;
- bs->backing_file[len] = '\0';
- }
- return 0;
-
- fail:
- g_free(s->l1_table);
- g_free(s->l2_cache);
- g_free(s->cluster_cache);
- g_free(s->cluster_data);
- return -1;
-}
-
-static int qcow_set_key(BlockDriverState *bs, const char *key)
-{
- BDRVQcowState *s = bs->opaque;
- uint8_t keybuf[16];
- int len, i;
-
- memset(keybuf, 0, 16);
- len = strlen(key);
- if (len > 16)
- len = 16;
- /* XXX: we could compress the chars to 7 bits to increase
- entropy */
- for(i = 0;i < len;i++) {
- keybuf[i] = key[i];
- }
- s->crypt_method = s->crypt_method_header;
-
- if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0)
- return -1;
- if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0)
- return -1;
-#if 0
- /* test */
- {
- uint8_t in[16];
- uint8_t out[16];
- uint8_t tmp[16];
- for(i=0;i<16;i++)
- in[i] = i;
- AES_encrypt(in, tmp, &s->aes_encrypt_key);
- AES_decrypt(tmp, out, &s->aes_decrypt_key);
- for(i = 0; i < 16; i++)
- printf(" %02x", tmp[i]);
- printf("\n");
- for(i = 0; i < 16; i++)
- printf(" %02x", out[i]);
- printf("\n");
- }
-#endif
- return 0;
-}
-
-/* The crypt function is compatible with the linux cryptoloop
- algorithm for < 4 GB images. NOTE: out_buf == in_buf is
- supported */
-static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
- uint8_t *out_buf, const uint8_t *in_buf,
- int nb_sectors, int enc,
- const AES_KEY *key)
-{
- union {
- uint64_t ll[2];
- uint8_t b[16];
- } ivec;
- int i;
-
- for(i = 0; i < nb_sectors; i++) {
- ivec.ll[0] = cpu_to_le64(sector_num);
- ivec.ll[1] = 0;
- AES_cbc_encrypt(in_buf, out_buf, 512, key,
- ivec.b, enc);
- sector_num++;
- in_buf += 512;
- out_buf += 512;
- }
-}
-
-/* 'allocate' is:
- *
- * 0 to not allocate.
- *
- * 1 to allocate a normal cluster (for sector indexes 'n_start' to
- * 'n_end')
- *
- * 2 to allocate a compressed cluster of size
- * 'compressed_size'. 'compressed_size' must be > 0 and <
- * cluster_size
- *
- * return 0 if not allocated.
- */
-static uint64_t get_cluster_offset(BlockDriverState *bs,
- uint64_t offset, int allocate,
- int compressed_size,
- int n_start, int n_end)
-{
- BDRVQcowState *s = bs->opaque;
- int min_index, i, j, l1_index, l2_index;
- uint64_t l2_offset, *l2_table, cluster_offset, tmp;
- uint32_t min_count;
- int new_l2_table;
-
- l1_index = offset >> (s->l2_bits + s->cluster_bits);
- l2_offset = s->l1_table[l1_index];
- new_l2_table = 0;
- if (!l2_offset) {
- if (!allocate)
- return 0;
- /* allocate a new l2 entry */
- l2_offset = bdrv_getlength(bs->file);
- /* round to cluster size */
- l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1);
- /* update the L1 entry */
- s->l1_table[l1_index] = l2_offset;
- tmp = cpu_to_be64(l2_offset);
- if (bdrv_pwrite_sync(bs->file,
- s->l1_table_offset + l1_index * sizeof(tmp),
- &tmp, sizeof(tmp)) < 0)
- return 0;
- new_l2_table = 1;
- }
- for(i = 0; i < L2_CACHE_SIZE; i++) {
- if (l2_offset == s->l2_cache_offsets[i]) {
- /* increment the hit count */
- if (++s->l2_cache_counts[i] == 0xffffffff) {
- for(j = 0; j < L2_CACHE_SIZE; j++) {
- s->l2_cache_counts[j] >>= 1;
- }
- }
- l2_table = s->l2_cache + (i << s->l2_bits);
- goto found;
- }
- }
- /* not found: load a new entry in the least used one */
- min_index = 0;
- min_count = 0xffffffff;
- for(i = 0; i < L2_CACHE_SIZE; i++) {
- if (s->l2_cache_counts[i] < min_count) {
- min_count = s->l2_cache_counts[i];
- min_index = i;
- }
- }
- l2_table = s->l2_cache + (min_index << s->l2_bits);
- if (new_l2_table) {
- memset(l2_table, 0, s->l2_size * sizeof(uint64_t));
- if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table,
- s->l2_size * sizeof(uint64_t)) < 0)
- return 0;
- } else {
- if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
- s->l2_size * sizeof(uint64_t))
- return 0;
- }
- s->l2_cache_offsets[min_index] = l2_offset;
- s->l2_cache_counts[min_index] = 1;
- found:
- l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
- cluster_offset = be64_to_cpu(l2_table[l2_index]);
- if (!cluster_offset ||
- ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
- if (!allocate)
- return 0;
- /* allocate a new cluster */
- if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
- (n_end - n_start) < s->cluster_sectors) {
- /* if the cluster is already compressed, we must
- decompress it in the case it is not completely
- overwritten */
- if (decompress_cluster(bs, cluster_offset) < 0)
- return 0;
- cluster_offset = bdrv_getlength(bs->file);
- cluster_offset = (cluster_offset + s->cluster_size - 1) &
- ~(s->cluster_size - 1);
- /* write the cluster content */
- if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) !=
- s->cluster_size)
- return -1;
- } else {
- cluster_offset = bdrv_getlength(bs->file);
- if (allocate == 1) {
- /* round to cluster size */
- cluster_offset = (cluster_offset + s->cluster_size - 1) &
- ~(s->cluster_size - 1);
- bdrv_truncate(bs->file, cluster_offset + s->cluster_size);
- /* if encrypted, we must initialize the cluster
- content which won't be written */
- if (s->crypt_method &&
- (n_end - n_start) < s->cluster_sectors) {
- uint64_t start_sect;
- start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
- memset(s->cluster_data + 512, 0x00, 512);
- for(i = 0; i < s->cluster_sectors; i++) {
- if (i < n_start || i >= n_end) {
- encrypt_sectors(s, start_sect + i,
- s->cluster_data,
- s->cluster_data + 512, 1, 1,
- &s->aes_encrypt_key);
- if (bdrv_pwrite(bs->file, cluster_offset + i * 512,
- s->cluster_data, 512) != 512)
- return -1;
- }
- }
- }
- } else if (allocate == 2) {
- cluster_offset |= QCOW_OFLAG_COMPRESSED |
- (uint64_t)compressed_size << (63 - s->cluster_bits);
- }
- }
- /* update L2 table */
- tmp = cpu_to_be64(cluster_offset);
- l2_table[l2_index] = tmp;
- if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp),
- &tmp, sizeof(tmp)) < 0)
- return 0;
- }
- return cluster_offset;
-}
-
-static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, int *pnum)
-{
- BDRVQcowState *s = bs->opaque;
- int index_in_cluster, n;
- uint64_t cluster_offset;
-
- cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0);
- index_in_cluster = sector_num & (s->cluster_sectors - 1);
- n = s->cluster_sectors - index_in_cluster;
- if (n > nb_sectors)
- n = nb_sectors;
- *pnum = n;
- return (cluster_offset != 0);
-}
-
-static int decompress_buffer(uint8_t *out_buf, int out_buf_size,
- const uint8_t *buf, int buf_size)
-{
- z_stream strm1, *strm = &strm1;
- int ret, out_len;
-
- memset(strm, 0, sizeof(*strm));
-
- strm->next_in = (uint8_t *)buf;
- strm->avail_in = buf_size;
- strm->next_out = out_buf;
- strm->avail_out = out_buf_size;
-
- ret = inflateInit2(strm, -12);
- if (ret != Z_OK)
- return -1;
- ret = inflate(strm, Z_FINISH);
- out_len = strm->next_out - out_buf;
- if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
- out_len != out_buf_size) {
- inflateEnd(strm);
- return -1;
- }
- inflateEnd(strm);
- return 0;
-}
-
-static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
-{
- BDRVQcowState *s = bs->opaque;
- int ret, csize;
- uint64_t coffset;
-
- coffset = cluster_offset & s->cluster_offset_mask;
- if (s->cluster_cache_offset != coffset) {
- csize = cluster_offset >> (63 - s->cluster_bits);
- csize &= (s->cluster_size - 1);
- ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize);
- if (ret != csize)
- return -1;
- if (decompress_buffer(s->cluster_cache, s->cluster_size,
- s->cluster_data, csize) < 0) {
- return -1;
- }
- s->cluster_cache_offset = coffset;
- }
- return 0;
-}
-
-#if 0
-
-static int qcow_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
-{
- BDRVQcowState *s = bs->opaque;
- int ret, index_in_cluster, n;
- uint64_t cluster_offset;
-
- while (nb_sectors > 0) {
- cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0);
- index_in_cluster = sector_num & (s->cluster_sectors - 1);
- n = s->cluster_sectors - index_in_cluster;
- if (n > nb_sectors)
- n = nb_sectors;
- if (!cluster_offset) {
- if (bs->backing_hd) {
- /* read from the base image */
- ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
- if (ret < 0)
- return -1;
- } else {
- memset(buf, 0, 512 * n);
- }
- } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
- if (decompress_cluster(bs, cluster_offset) < 0)
- return -1;
- memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
- } else {
- ret = bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512);
- if (ret != n * 512)
- return -1;
- if (s->crypt_method) {
- encrypt_sectors(s, sector_num, buf, buf, n, 0,
- &s->aes_decrypt_key);
- }
- }
- nb_sectors -= n;
- sector_num += n;
- buf += n * 512;
- }
- return 0;
-}
-#endif
-
-typedef struct QCowAIOCB {
- BlockDriverAIOCB common;
- int64_t sector_num;
- QEMUIOVector *qiov;
- uint8_t *buf;
- void *orig_buf;
- int nb_sectors;
- int n;
- uint64_t cluster_offset;
- uint8_t *cluster_data;
- struct iovec hd_iov;
- QEMUIOVector hd_qiov;
- BlockDriverAIOCB *hd_aiocb;
-} QCowAIOCB;
-
-static void qcow_aio_cancel(BlockDriverAIOCB *blockacb)
-{
- QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common);
- if (acb->hd_aiocb)
- bdrv_aio_cancel(acb->hd_aiocb);
- qemu_aio_release(acb);
-}
-
-static AIOPool qcow_aio_pool = {
- .aiocb_size = sizeof(QCowAIOCB),
- .cancel = qcow_aio_cancel,
-};
-
-static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque, int is_write)
-{
- QCowAIOCB *acb;
-
- acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque);
- if (!acb)
- return NULL;
- acb->hd_aiocb = NULL;
- acb->sector_num = sector_num;
- acb->qiov = qiov;
- if (qiov->niov > 1) {
- acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size);
- if (is_write)
- qemu_iovec_to_buf(qiov, 0, acb->buf, qiov->size);
- } else {
- acb->buf = (uint8_t *)qiov->iov->iov_base;
- }
- acb->nb_sectors = nb_sectors;
- acb->n = 0;
- acb->cluster_offset = 0;
- return acb;
-}
-
-static void qcow_aio_read_cb(void *opaque, int ret)
-{
- QCowAIOCB *acb = opaque;
- BlockDriverState *bs = acb->common.bs;
- BDRVQcowState *s = bs->opaque;
- int index_in_cluster;
-
- acb->hd_aiocb = NULL;
- if (ret < 0)
- goto done;
-
- redo:
- /* post process the read buffer */
- if (!acb->cluster_offset) {
- /* nothing to do */
- } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
- /* nothing to do */
- } else {
- if (s->crypt_method) {
- encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf,
- acb->n, 0,
- &s->aes_decrypt_key);
- }
- }
-
- acb->nb_sectors -= acb->n;
- acb->sector_num += acb->n;
- acb->buf += acb->n * 512;
-
- if (acb->nb_sectors == 0) {
- /* request completed */
- ret = 0;
- goto done;
- }
-
- /* prepare next AIO request */
- acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
- 0, 0, 0, 0);
- index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
- acb->n = s->cluster_sectors - index_in_cluster;
- if (acb->n > acb->nb_sectors)
- acb->n = acb->nb_sectors;
-
- if (!acb->cluster_offset) {
- if (bs->backing_hd) {
- /* read from the base image */
- acb->hd_iov.iov_base = (void *)acb->buf;
- acb->hd_iov.iov_len = acb->n * 512;
- qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
- acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
- &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
- if (acb->hd_aiocb == NULL)
- goto done;
- } else {
- /* Note: in this case, no need to wait */
- memset(acb->buf, 0, 512 * acb->n);
- goto redo;
- }
- } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
- /* add AIO support for compressed blocks ? */
- if (decompress_cluster(bs, acb->cluster_offset) < 0)
- goto done;
- memcpy(acb->buf,
- s->cluster_cache + index_in_cluster * 512, 512 * acb->n);
- goto redo;
- } else {
- if ((acb->cluster_offset & 511) != 0) {
- ret = -EIO;
- goto done;
- }
- acb->hd_iov.iov_base = (void *)acb->buf;
- acb->hd_iov.iov_len = acb->n * 512;
- qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
- acb->hd_aiocb = bdrv_aio_readv(bs->file,
- (acb->cluster_offset >> 9) + index_in_cluster,
- &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
- if (acb->hd_aiocb == NULL)
- goto done;
- }
-
- return;
-
-done:
- if (acb->qiov->niov > 1) {
- qemu_iovec_from_buf(acb->qiov, 0, acb->orig_buf, acb->qiov->size);
- qemu_vfree(acb->orig_buf);
- }
- acb->common.cb(acb->common.opaque, ret);
- qemu_aio_release(acb);
-}
-
-static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque)
-{
- QCowAIOCB *acb;
-
- acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
- if (!acb)
- return NULL;
-
- qcow_aio_read_cb(acb, 0);
- return &acb->common;
-}
-
-static void qcow_aio_write_cb(void *opaque, int ret)
-{
- QCowAIOCB *acb = opaque;
- BlockDriverState *bs = acb->common.bs;
- BDRVQcowState *s = bs->opaque;
- int index_in_cluster;
- uint64_t cluster_offset;
- const uint8_t *src_buf;
-
- acb->hd_aiocb = NULL;
-
- if (ret < 0)
- goto done;
-
- acb->nb_sectors -= acb->n;
- acb->sector_num += acb->n;
- acb->buf += acb->n * 512;
-
- if (acb->nb_sectors == 0) {
- /* request completed */
- ret = 0;
- goto done;
- }
-
- index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
- acb->n = s->cluster_sectors - index_in_cluster;
- if (acb->n > acb->nb_sectors)
- acb->n = acb->nb_sectors;
- cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, 1, 0,
- index_in_cluster,
- index_in_cluster + acb->n);
- if (!cluster_offset || (cluster_offset & 511) != 0) {
- ret = -EIO;
- goto done;
- }
- if (s->crypt_method) {
- if (!acb->cluster_data) {
- acb->cluster_data = g_malloc0(s->cluster_size);
- if (!acb->cluster_data) {
- ret = -ENOMEM;
- goto done;
- }
- }
- encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf,
- acb->n, 1, &s->aes_encrypt_key);
- src_buf = acb->cluster_data;
- } else {
- src_buf = acb->buf;
- }
-
- acb->hd_iov.iov_base = (void *)src_buf;
- acb->hd_iov.iov_len = acb->n * 512;
- qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
- acb->hd_aiocb = bdrv_aio_writev(bs->file,
- (cluster_offset >> 9) + index_in_cluster,
- &acb->hd_qiov, acb->n,
- qcow_aio_write_cb, acb);
- if (acb->hd_aiocb == NULL)
- goto done;
- return;
-
-done:
- if (acb->qiov->niov > 1)
- qemu_vfree(acb->orig_buf);
- acb->common.cb(acb->common.opaque, ret);
- qemu_aio_release(acb);
-}
-
-static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque)
-{
- BDRVQcowState *s = bs->opaque;
- QCowAIOCB *acb;
-
- s->cluster_cache_offset = -1; /* disable compressed cache */
-
- acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
- if (!acb)
- return NULL;
-
-
- qcow_aio_write_cb(acb, 0);
- return &acb->common;
-}
-
-static void qcow_close(BlockDriverState *bs)
-{
- BDRVQcowState *s = bs->opaque;
- g_free(s->l1_table);
- g_free(s->l2_cache);
- g_free(s->cluster_cache);
- g_free(s->cluster_data);
-}
-
-static int qcow_create(const char *filename, QEMUOptionParameter *options)
-{
- int fd, header_size, backing_filename_len, l1_size, i, shift;
- QCowHeader header;
- uint64_t tmp;
- int64_t total_size = 0;
- const char *backing_file = NULL;
- int flags = 0;
- int ret;
-
- /* Read out options */
- while (options && options->name) {
- if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
- total_size = options->value.n / 512;
- } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
- backing_file = options->value.s;
- } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) {
- flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
- }
- options++;
- }
-
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
- if (fd < 0)
- return -errno;
- memset(&header, 0, sizeof(header));
- header.magic = cpu_to_be32(QCOW_MAGIC);
- header.version = cpu_to_be32(QCOW_VERSION);
- header.size = cpu_to_be64(total_size * 512);
- header_size = sizeof(header);
- backing_filename_len = 0;
- if (backing_file) {
- if (strcmp(backing_file, "fat:")) {
- header.backing_file_offset = cpu_to_be64(header_size);
- backing_filename_len = strlen(backing_file);
- header.backing_file_size = cpu_to_be32(backing_filename_len);
- header_size += backing_filename_len;
- } else {
- /* special backing file for vvfat */
- backing_file = NULL;
- }
- header.cluster_bits = 9; /* 512 byte cluster to avoid copying
- unmodifyed sectors */
- header.l2_bits = 12; /* 32 KB L2 tables */
- } else {
- header.cluster_bits = 12; /* 4 KB clusters */
- header.l2_bits = 9; /* 4 KB L2 tables */
- }
- header_size = (header_size + 7) & ~7;
- shift = header.cluster_bits + header.l2_bits;
- l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift;
-
- header.l1_table_offset = cpu_to_be64(header_size);
- if (flags & BLOCK_FLAG_ENCRYPT) {
- header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
- } else {
- header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
- }
-
- /* write all the data */
- ret = qemu_write_full(fd, &header, sizeof(header));
- if (ret != sizeof(header)) {
- ret = -errno;
- goto exit;
- }
-
- if (backing_file) {
- ret = qemu_write_full(fd, backing_file, backing_filename_len);
- if (ret != backing_filename_len) {
- ret = -errno;
- goto exit;
- }
-
- }
- lseek(fd, header_size, SEEK_SET);
- tmp = 0;
- for(i = 0;i < l1_size; i++) {
- ret = qemu_write_full(fd, &tmp, sizeof(tmp));
- if (ret != sizeof(tmp)) {
- ret = -errno;
- goto exit;
- }
- }
-
- ret = 0;
-exit:
- close(fd);
- return ret;
-}
-
-static int qcow_make_empty(BlockDriverState *bs)
-{
- BDRVQcowState *s = bs->opaque;
- uint32_t l1_length = s->l1_size * sizeof(uint64_t);
- int ret;
-
- memset(s->l1_table, 0, l1_length);
- if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table,
- l1_length) < 0)
- return -1;
- ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
- if (ret < 0)
- return ret;
-
- memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
- memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t));
- memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t));
-
- return 0;
-}
-
-/* XXX: put compressed sectors first, then all the cluster aligned
- tables to avoid losing bytes in alignment */
-static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
-{
- BDRVQcowState *s = bs->opaque;
- z_stream strm;
- int ret, out_len;
- uint8_t *out_buf;
- uint64_t cluster_offset;
-
- if (nb_sectors != s->cluster_sectors)
- return -EINVAL;
-
- out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
- if (!out_buf)
- return -1;
-
- /* best compression, small window, no zlib header */
- memset(&strm, 0, sizeof(strm));
- ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
- Z_DEFLATED, -12,
- 9, Z_DEFAULT_STRATEGY);
- if (ret != 0) {
- g_free(out_buf);
- return -1;
- }
-
- strm.avail_in = s->cluster_size;
- strm.next_in = (uint8_t *)buf;
- strm.avail_out = s->cluster_size;
- strm.next_out = out_buf;
-
- ret = deflate(&strm, Z_FINISH);
- if (ret != Z_STREAM_END && ret != Z_OK) {
- g_free(out_buf);
- deflateEnd(&strm);
- return -1;
- }
- out_len = strm.next_out - out_buf;
-
- deflateEnd(&strm);
-
- if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
- /* could not compress: write normal cluster */
- bdrv_write(bs, sector_num, buf, s->cluster_sectors);
- } else {
- cluster_offset = get_cluster_offset(bs, sector_num << 9, 2,
- out_len, 0, 0);
- cluster_offset &= s->cluster_offset_mask;
- if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
- g_free(out_buf);
- return -1;
- }
- }
-
- g_free(out_buf);
- return 0;
-}
-
-static void qcow_flush(BlockDriverState *bs)
-{
- bdrv_flush(bs->file);
-}
-
-static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
- BlockDriverCompletionFunc *cb, void *opaque)
-{
- return bdrv_aio_flush(bs->file, cb, opaque);
-}
-
-static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
-{
- BDRVQcowState *s = bs->opaque;
- bdi->cluster_size = s->cluster_size;
- return 0;
-}
-
-
-static QEMUOptionParameter qcow_create_options[] = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = OPT_SIZE,
- .help = "Virtual disk size"
- },
- {
- .name = BLOCK_OPT_BACKING_FILE,
- .type = OPT_STRING,
- .help = "File name of a base image"
- },
- {
- .name = BLOCK_OPT_ENCRYPT,
- .type = OPT_FLAG,
- .help = "Encrypt the image"
- },
- { NULL }
-};
-
-static BlockDriver bdrv_qcow = {
- .format_name = "qcow",
- .instance_size = sizeof(BDRVQcowState),
- .bdrv_probe = qcow_probe,
- .bdrv_open = qcow_open,
- .bdrv_close = qcow_close,
- .bdrv_create = qcow_create,
- .bdrv_flush = qcow_flush,
- .bdrv_is_allocated = qcow_is_allocated,
- .bdrv_set_key = qcow_set_key,
- .bdrv_make_empty = qcow_make_empty,
- .bdrv_aio_readv = qcow_aio_readv,
- .bdrv_aio_writev = qcow_aio_writev,
- .bdrv_aio_flush = qcow_aio_flush,
- .bdrv_write_compressed = qcow_write_compressed,
- .bdrv_get_info = qcow_get_info,
-
- .create_options = qcow_create_options,
-};
-
-static void bdrv_qcow_init(void)
-{
- bdrv_register(&bdrv_qcow);
-}
-
-block_init(bdrv_qcow_init);
