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-rw-r--r--block/blkverify.c5
-rw-r--r--block/qcow2-cluster.c25
-rw-r--r--block/qcow2-snapshot.c33
-rw-r--r--block/qcow2.c278
-rw-r--r--block/qcow2.h3
5 files changed, 146 insertions, 198 deletions
diff --git a/block/blkverify.c b/block/blkverify.c
index 8083464751..b2a12fe7f5 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -53,7 +53,8 @@ static AIOPool blkverify_aio_pool = {
.cancel = blkverify_aio_cancel,
};
-static void blkverify_err(BlkverifyAIOCB *acb, const char *fmt, ...)
+static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyAIOCB *acb,
+ const char *fmt, ...)
{
va_list ap;
@@ -299,7 +300,7 @@ static void blkverify_verify_readv(BlkverifyAIOCB *acb)
{
ssize_t offset = blkverify_iovec_compare(acb->qiov, &acb->raw_qiov);
if (offset != -1) {
- blkverify_err(acb, "contents mismatch in sector %ld",
+ blkverify_err(acb, "contents mismatch in sector %lld",
acb->sector_num + (offset / BDRV_SECTOR_SIZE));
}
}
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index fb4224a669..4f7dc59b76 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -28,7 +28,7 @@
#include "block_int.h"
#include "block/qcow2.h"
-int qcow2_grow_l1_table(BlockDriverState *bs, int min_size)
+int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, bool exact_size)
{
BDRVQcowState *s = bs->opaque;
int new_l1_size, new_l1_size2, ret, i;
@@ -36,15 +36,22 @@ int qcow2_grow_l1_table(BlockDriverState *bs, int min_size)
int64_t new_l1_table_offset;
uint8_t data[12];
- new_l1_size = s->l1_size;
- if (min_size <= new_l1_size)
+ if (min_size <= s->l1_size)
return 0;
- if (new_l1_size == 0) {
- new_l1_size = 1;
- }
- while (min_size > new_l1_size) {
- new_l1_size = (new_l1_size * 3 + 1) / 2;
+
+ if (exact_size) {
+ new_l1_size = min_size;
+ } else {
+ /* Bump size up to reduce the number of times we have to grow */
+ new_l1_size = s->l1_size;
+ if (new_l1_size == 0) {
+ new_l1_size = 1;
+ }
+ while (min_size > new_l1_size) {
+ new_l1_size = (new_l1_size * 3 + 1) / 2;
+ }
}
+
#ifdef DEBUG_ALLOC2
printf("grow l1_table from %d to %d\n", s->l1_size, new_l1_size);
#endif
@@ -550,7 +557,7 @@ static int get_cluster_table(BlockDriverState *bs, uint64_t offset,
l1_index = offset >> (s->l2_bits + s->cluster_bits);
if (l1_index >= s->l1_size) {
- ret = qcow2_grow_l1_table(bs, l1_index + 1);
+ ret = qcow2_grow_l1_table(bs, l1_index + 1, false);
if (ret < 0) {
return ret;
}
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index bbfcaaae22..aacf357821 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -327,7 +327,7 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
if (qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, -1) < 0)
goto fail;
- if (qcow2_grow_l1_table(bs, sn->l1_size) < 0)
+ if (qcow2_grow_l1_table(bs, sn->l1_size, true) < 0)
goto fail;
s->l1_size = sn->l1_size;
@@ -418,3 +418,34 @@ int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
return s->nb_snapshots;
}
+int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name)
+{
+ int i, snapshot_index, l1_size2;
+ BDRVQcowState *s = bs->opaque;
+ QCowSnapshot *sn;
+
+ snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_name);
+ if (snapshot_index < 0) {
+ return -ENOENT;
+ }
+
+ sn = &s->snapshots[snapshot_index];
+ s->l1_size = sn->l1_size;
+ l1_size2 = s->l1_size * sizeof(uint64_t);
+ if (s->l1_table != NULL) {
+ qemu_free(s->l1_table);
+ }
+
+ s->l1_table_offset = sn->l1_table_offset;
+ s->l1_table = qemu_mallocz(align_offset(l1_size2, 512));
+
+ if (bdrv_pread(bs->file, sn->l1_table_offset,
+ s->l1_table, l1_size2) != l1_size2) {
+ return -1;
+ }
+
+ for(i = 0;i < s->l1_size; i++) {
+ be64_to_cpus(&s->l1_table[i]);
+ }
+ return 0;
+}
diff --git a/block/qcow2.c b/block/qcow2.c
index ee3481b786..b816d8733f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -27,6 +27,7 @@
#include <zlib.h>
#include "aes.h"
#include "block/qcow2.h"
+#include "qemu-error.h"
/*
Differences with QCOW:
@@ -794,28 +795,6 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
return qcow2_update_ext_header(bs, backing_file, backing_fmt);
}
-static int get_bits_from_size(size_t size)
-{
- int res = 0;
-
- if (size == 0) {
- return -1;
- }
-
- while (size != 1) {
- /* Not a power of two */
- if (size & 1) {
- return -1;
- }
-
- size >>= 1;
- res++;
- }
-
- return res;
-}
-
-
static int preallocate(BlockDriverState *bs)
{
uint64_t nb_sectors;
@@ -871,199 +850,127 @@ static int preallocate(BlockDriverState *bs)
static int qcow_create2(const char *filename, int64_t total_size,
const char *backing_file, const char *backing_format,
- int flags, size_t cluster_size, int prealloc)
+ int flags, size_t cluster_size, int prealloc,
+ QEMUOptionParameter *options)
{
+ /* Calulate cluster_bits */
+ int cluster_bits;
+ cluster_bits = ffs(cluster_size) - 1;
+ if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
+ (1 << cluster_bits) != cluster_size)
+ {
+ error_report(
+ "Cluster size must be a power of two between %d and %dk\n",
+ 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10));
+ return -EINVAL;
+ }
- int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits;
- int ref_clusters, reftable_clusters, backing_format_len = 0;
- int rounded_ext_bf_len = 0;
+ /*
+ * Open the image file and write a minimal qcow2 header.
+ *
+ * We keep things simple and start with a zero-sized image. We also
+ * do without refcount blocks or a L1 table for now. We'll fix the
+ * inconsistency later.
+ *
+ * We do need a refcount table because growing the refcount table means
+ * allocating two new refcount blocks - the seconds of which would be at
+ * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file
+ * size for any qcow2 image.
+ */
+ BlockDriverState* bs;
QCowHeader header;
- uint64_t tmp, offset;
- uint64_t old_ref_clusters;
- QCowCreateState s1, *s = &s1;
- QCowExtension ext_bf = {0, 0};
+ uint8_t* refcount_table;
int ret;
- memset(s, 0, sizeof(*s));
+ ret = bdrv_create_file(filename, options);
+ if (ret < 0) {
+ return ret;
+ }
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
- if (fd < 0)
- return -errno;
+ ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* Write the header */
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 (backing_format) {
- ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT;
- backing_format_len = strlen(backing_format);
- ext_bf.len = backing_format_len;
- rounded_ext_bf_len = (sizeof(ext_bf) + ext_bf.len + 7) & ~7;
- header_size += rounded_ext_bf_len;
- }
- 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;
- }
-
- /* Cluster size */
- s->cluster_bits = get_bits_from_size(cluster_size);
- if (s->cluster_bits < MIN_CLUSTER_BITS ||
- s->cluster_bits > MAX_CLUSTER_BITS)
- {
- fprintf(stderr, "Cluster size must be a power of two between "
- "%d and %dk\n",
- 1 << MIN_CLUSTER_BITS,
- 1 << (MAX_CLUSTER_BITS - 10));
- return -EINVAL;
- }
- s->cluster_size = 1 << s->cluster_bits;
+ header.cluster_bits = cpu_to_be32(cluster_bits);
+ header.size = cpu_to_be64(0);
+ header.l1_table_offset = cpu_to_be64(0);
+ header.l1_size = cpu_to_be32(0);
+ header.refcount_table_offset = cpu_to_be64(cluster_size);
+ header.refcount_table_clusters = cpu_to_be32(1);
- header.cluster_bits = cpu_to_be32(s->cluster_bits);
- header_size = (header_size + 7) & ~7;
if (flags & BLOCK_FLAG_ENCRYPT) {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
} else {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
}
- l2_bits = s->cluster_bits - 3;
- shift = s->cluster_bits + l2_bits;
- l1_size = (((total_size * 512) + (1LL << shift) - 1) >> shift);
- offset = align_offset(header_size, s->cluster_size);
- s->l1_table_offset = offset;
- header.l1_table_offset = cpu_to_be64(s->l1_table_offset);
- header.l1_size = cpu_to_be32(l1_size);
- offset += align_offset(l1_size * sizeof(uint64_t), s->cluster_size);
-
- /* count how many refcount blocks needed */
-
-#define NUM_CLUSTERS(bytes) \
- (((bytes) + (s->cluster_size) - 1) / (s->cluster_size))
- ref_clusters = NUM_CLUSTERS(NUM_CLUSTERS(offset) * sizeof(uint16_t));
-
- do {
- uint64_t image_clusters;
- old_ref_clusters = ref_clusters;
-
- /* Number of clusters used for the refcount table */
- reftable_clusters = NUM_CLUSTERS(ref_clusters * sizeof(uint64_t));
+ ret = bdrv_pwrite(bs, 0, &header, sizeof(header));
+ if (ret < 0) {
+ goto out;
+ }
- /* Number of clusters that the whole image will have */
- image_clusters = NUM_CLUSTERS(offset) + ref_clusters
- + reftable_clusters;
+ /* Write an empty refcount table */
+ refcount_table = qemu_mallocz(cluster_size);
+ ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size);
+ qemu_free(refcount_table);
- /* Number of refcount blocks needed for the image */
- ref_clusters = NUM_CLUSTERS(image_clusters * sizeof(uint16_t));
+ if (ret < 0) {
+ goto out;
+ }
- } while (ref_clusters != old_ref_clusters);
+ bdrv_close(bs);
- s->refcount_table = qemu_mallocz(reftable_clusters * s->cluster_size);
+ /*
+ * And now open the image and make it consistent first (i.e. increase the
+ * refcount of the cluster that is occupied by the header and the refcount
+ * table)
+ */
+ BlockDriver* drv = bdrv_find_format("qcow2");
+ assert(drv != NULL);
+ ret = bdrv_open(bs, filename, BDRV_O_RDWR | BDRV_O_NO_FLUSH, drv);
+ if (ret < 0) {
+ goto out;
+ }
- s->refcount_table_offset = offset;
- header.refcount_table_offset = cpu_to_be64(offset);
- header.refcount_table_clusters = cpu_to_be32(reftable_clusters);
- offset += (reftable_clusters * s->cluster_size);
- s->refcount_block_offset = offset;
+ ret = qcow2_alloc_clusters(bs, 2 * cluster_size);
+ if (ret < 0) {
+ goto out;
- for (i=0; i < ref_clusters; i++) {
- s->refcount_table[i] = cpu_to_be64(offset);
- offset += s->cluster_size;
+ } else if (ret != 0) {
+ error_report("Huh, first cluster in empty image is already in use?");
+ abort();
}
- s->refcount_block = qemu_mallocz(ref_clusters * s->cluster_size);
-
- /* update refcounts */
- qcow2_create_refcount_update(s, 0, header_size);
- qcow2_create_refcount_update(s, s->l1_table_offset,
- l1_size * sizeof(uint64_t));
- qcow2_create_refcount_update(s, s->refcount_table_offset,
- reftable_clusters * s->cluster_size);
- qcow2_create_refcount_update(s, s->refcount_block_offset,
- ref_clusters * s->cluster_size);
-
- /* write all the data */
- ret = qemu_write_full(fd, &header, sizeof(header));
- if (ret != sizeof(header)) {
- ret = -errno;
- goto exit;
+ /* Okay, now that we have a valid image, let's give it the right size */
+ ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE);
+ if (ret < 0) {
+ goto out;
}
+
+ /* Want a backing file? There you go.*/
if (backing_file) {
- if (backing_format_len) {
- char zero[16];
- int padding = rounded_ext_bf_len - (ext_bf.len + sizeof(ext_bf));
-
- memset(zero, 0, sizeof(zero));
- cpu_to_be32s(&ext_bf.magic);
- cpu_to_be32s(&ext_bf.len);
- ret = qemu_write_full(fd, &ext_bf, sizeof(ext_bf));
- if (ret != sizeof(ext_bf)) {
- ret = -errno;
- goto exit;
- }
- ret = qemu_write_full(fd, backing_format, backing_format_len);
- if (ret != backing_format_len) {
- ret = -errno;
- goto exit;
- }
- if (padding > 0) {
- ret = qemu_write_full(fd, zero, padding);
- if (ret != padding) {
- ret = -errno;
- goto exit;
- }
- }
- }
- ret = qemu_write_full(fd, backing_file, backing_filename_len);
- if (ret != backing_filename_len) {
- ret = -errno;
- goto exit;
- }
- }
- lseek(fd, s->l1_table_offset, 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 = bdrv_change_backing_file(bs, backing_file, backing_format);
+ if (ret < 0) {
+ goto out;
}
}
- lseek(fd, s->refcount_table_offset, SEEK_SET);
- ret = qemu_write_full(fd, s->refcount_table,
- reftable_clusters * s->cluster_size);
- if (ret != reftable_clusters * s->cluster_size) {
- ret = -errno;
- goto exit;
- }
-
- lseek(fd, s->refcount_block_offset, SEEK_SET);
- ret = qemu_write_full(fd, s->refcount_block,
- ref_clusters * s->cluster_size);
- if (ret != ref_clusters * s->cluster_size) {
- ret = -errno;
- goto exit;
- }
- ret = 0;
-exit:
- qemu_free(s->refcount_table);
- qemu_free(s->refcount_block);
- close(fd);
-
- /* Preallocate metadata */
- if (ret == 0 && prealloc) {
- BlockDriverState *bs;
- BlockDriver *drv = bdrv_find_format("qcow2");
- bs = bdrv_new("");
- bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR, drv);
+ /* And if we're supposed to preallocate metadata, do that now */
+ if (prealloc) {
ret = preallocate(bs);
- bdrv_close(bs);
+ if (ret < 0) {
+ goto out;
+ }
}
+ ret = 0;
+out:
+ bdrv_delete(bs);
return ret;
}
@@ -1111,7 +1018,7 @@ static int qcow_create(const char *filename, QEMUOptionParameter *options)
}
return qcow_create2(filename, sectors, backing_file, backing_fmt, flags,
- cluster_size, prealloc);
+ cluster_size, prealloc, options);
}
static int qcow_make_empty(BlockDriverState *bs)
@@ -1154,7 +1061,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
}
new_l1_size = size_to_l1(s, offset);
- ret = qcow2_grow_l1_table(bs, new_l1_size);
+ ret = qcow2_grow_l1_table(bs, new_l1_size, true);
if (ret < 0) {
return ret;
}
@@ -1379,6 +1286,7 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_snapshot_goto = qcow2_snapshot_goto,
.bdrv_snapshot_delete = qcow2_snapshot_delete,
.bdrv_snapshot_list = qcow2_snapshot_list,
+ .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp,
.bdrv_get_info = qcow_get_info,
.bdrv_save_vmstate = qcow_save_vmstate,
diff --git a/block/qcow2.h b/block/qcow2.h
index 356a34af43..2d22e5ec47 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -188,7 +188,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res);
/* qcow2-cluster.c functions */
-int qcow2_grow_l1_table(BlockDriverState *bs, int min_size);
+int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, bool exact_size);
void qcow2_l2_cache_reset(BlockDriverState *bs);
int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
@@ -211,6 +211,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
+int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name);
void qcow2_free_snapshots(BlockDriverState *bs);
int qcow2_read_snapshots(BlockDriverState *bs);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-18 05:56:31 +0000