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Diffstat (limited to 'block/qcow2.c')
-rw-r--r--block/qcow2.c190
1 files changed, 98 insertions, 92 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 537c479a7b..4b41190a56 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -50,10 +50,10 @@ typedef struct {
uint32_t magic;
uint32_t len;
} QCowExtension;
-#define QCOW_EXT_MAGIC_END 0
-#define QCOW_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
+#define QCOW2_EXT_MAGIC_END 0
+#define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
-static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
+static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const QCowHeader *cow_header = (const void *)buf;
@@ -73,14 +73,14 @@ static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
* unknown magic is skipped (future extension this version knows nothing about)
* return 0 upon success, non-0 otherwise
*/
-static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
- uint64_t end_offset)
+static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
+ uint64_t end_offset)
{
QCowExtension ext;
uint64_t offset;
#ifdef DEBUG_EXT
- printf("qcow_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
+ printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
#endif
offset = start_offset;
while (offset < end_offset) {
@@ -88,13 +88,13 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
#ifdef DEBUG_EXT
/* Sanity check */
if (offset > s->cluster_size)
- printf("qcow_handle_extension: suspicious offset %lu\n", offset);
+ printf("qcow2_read_extension: suspicious offset %lu\n", offset);
printf("attemting to read extended header in offset %lu\n", offset);
#endif
if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) {
- fprintf(stderr, "qcow_handle_extension: ERROR: "
+ fprintf(stderr, "qcow2_read_extension: ERROR: "
"pread fail from offset %" PRIu64 "\n",
offset);
return 1;
@@ -106,10 +106,10 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
printf("ext.magic = 0x%x\n", ext.magic);
#endif
switch (ext.magic) {
- case QCOW_EXT_MAGIC_END:
+ case QCOW2_EXT_MAGIC_END:
return 0;
- case QCOW_EXT_MAGIC_BACKING_FORMAT:
+ case QCOW2_EXT_MAGIC_BACKING_FORMAT:
if (ext.len >= sizeof(bs->backing_format)) {
fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
" (>=%zu)\n",
@@ -137,7 +137,7 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
}
-static int qcow_open(BlockDriverState *bs, int flags)
+static int qcow2_open(BlockDriverState *bs, int flags)
{
BDRVQcowState *s = bs->opaque;
int len, i;
@@ -222,7 +222,7 @@ static int qcow_open(BlockDriverState *bs, int flags)
ext_end = header.backing_file_offset;
else
ext_end = s->cluster_size;
- if (qcow_read_extensions(bs, sizeof(header), ext_end))
+ if (qcow2_read_extensions(bs, sizeof(header), ext_end))
goto fail;
/* read the backing file name */
@@ -252,7 +252,7 @@ static int qcow_open(BlockDriverState *bs, int flags)
return -1;
}
-static int qcow_set_key(BlockDriverState *bs, const char *key)
+static int qcow2_set_key(BlockDriverState *bs, const char *key)
{
BDRVQcowState *s = bs->opaque;
uint8_t keybuf[16];
@@ -294,8 +294,8 @@ static int qcow_set_key(BlockDriverState *bs, const char *key)
return 0;
}
-static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, int *pnum)
+static int qcow2_is_allocated(BlockDriverState *bs, int64_t sector_num,
+ int nb_sectors, int *pnum)
{
uint64_t cluster_offset;
int ret;
@@ -344,7 +344,7 @@ typedef struct QCowAIOCB {
QLIST_ENTRY(QCowAIOCB) next_depend;
} QCowAIOCB;
-static void qcow_aio_cancel(BlockDriverAIOCB *blockacb)
+static void qcow2_aio_cancel(BlockDriverAIOCB *blockacb)
{
QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common);
if (acb->hd_aiocb)
@@ -352,21 +352,21 @@ static void qcow_aio_cancel(BlockDriverAIOCB *blockacb)
qemu_aio_release(acb);
}
-static AIOPool qcow_aio_pool = {
+static AIOPool qcow2_aio_pool = {
.aiocb_size = sizeof(QCowAIOCB),
- .cancel = qcow_aio_cancel,
+ .cancel = qcow2_aio_cancel,
};
-static void qcow_aio_read_cb(void *opaque, int ret);
-static void qcow_aio_read_bh(void *opaque)
+static void qcow2_aio_read_cb(void *opaque, int ret);
+static void qcow2_aio_read_bh(void *opaque)
{
QCowAIOCB *acb = opaque;
qemu_bh_delete(acb->bh);
acb->bh = NULL;
- qcow_aio_read_cb(opaque, 0);
+ qcow2_aio_read_cb(opaque, 0);
}
-static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb)
+static int qcow2_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb)
{
if (acb->bh)
return -EIO;
@@ -380,7 +380,7 @@ static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb)
return 0;
}
-static void qcow_aio_read_cb(void *opaque, int ret)
+static void qcow2_aio_read_cb(void *opaque, int ret)
{
QCowAIOCB *acb = opaque;
BlockDriverState *bs = acb->common.bs;
@@ -447,18 +447,18 @@ static void qcow_aio_read_cb(void *opaque, int ret)
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
&acb->hd_qiov, acb->cur_nr_sectors,
- qcow_aio_read_cb, acb);
+ qcow2_aio_read_cb, acb);
if (acb->hd_aiocb == NULL)
goto done;
} else {
- ret = qcow_schedule_bh(qcow_aio_read_bh, acb);
+ ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb);
if (ret < 0)
goto done;
}
} else {
/* Note: in this case, no need to wait */
qemu_iovec_memset(&acb->hd_qiov, 0, 512 * acb->cur_nr_sectors);
- ret = qcow_schedule_bh(qcow_aio_read_bh, acb);
+ ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb);
if (ret < 0)
goto done;
}
@@ -471,7 +471,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
s->cluster_cache + index_in_cluster * 512,
512 * acb->cur_nr_sectors);
- ret = qcow_schedule_bh(qcow_aio_read_bh, acb);
+ ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb);
if (ret < 0)
goto done;
} else {
@@ -501,7 +501,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
acb->hd_aiocb = bdrv_aio_readv(bs->file,
(acb->cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->cur_nr_sectors,
- qcow_aio_read_cb, acb);
+ qcow2_aio_read_cb, acb);
if (acb->hd_aiocb == NULL) {
ret = -EIO;
goto done;
@@ -515,13 +515,14 @@ done:
qemu_aio_release(acb);
}
-static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque, int is_write)
+static QCowAIOCB *qcow2_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);
+ acb = qemu_aio_get(&qcow2_aio_pool, bs, cb, opaque);
if (!acb)
return NULL;
acb->hd_aiocb = NULL;
@@ -539,21 +540,23 @@ static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
return acb;
}
-static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque)
+static BlockDriverAIOCB *qcow2_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);
+ acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
if (!acb)
return NULL;
- qcow_aio_read_cb(acb, 0);
+ qcow2_aio_read_cb(acb, 0);
return &acb->common;
}
-static void qcow_aio_write_cb(void *opaque, int ret);
+static void qcow2_aio_write_cb(void *opaque, int ret);
static void run_dependent_requests(QCowL2Meta *m)
{
@@ -567,14 +570,14 @@ static void run_dependent_requests(QCowL2Meta *m)
/* Restart all dependent requests */
QLIST_FOREACH_SAFE(req, &m->dependent_requests, next_depend, next) {
- qcow_aio_write_cb(req, 0);
+ qcow2_aio_write_cb(req, 0);
}
/* Empty the list for the next part of the request */
QLIST_INIT(&m->dependent_requests);
}
-static void qcow_aio_write_cb(void *opaque, int ret)
+static void qcow2_aio_write_cb(void *opaque, int ret)
{
QCowAIOCB *acb = opaque;
BlockDriverState *bs = acb->common.bs;
@@ -651,7 +654,7 @@ static void qcow_aio_write_cb(void *opaque, int ret)
acb->hd_aiocb = bdrv_aio_writev(bs->file,
(acb->cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->cur_nr_sectors,
- qcow_aio_write_cb, acb);
+ qcow2_aio_write_cb, acb);
if (acb->hd_aiocb == NULL) {
ret = -EIO;
goto fail;
@@ -669,24 +672,26 @@ done:
qemu_aio_release(acb);
}
-static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
- int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb, void *opaque)
+static BlockDriverAIOCB *qcow2_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);
+ acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
if (!acb)
return NULL;
- qcow_aio_write_cb(acb, 0);
+ qcow2_aio_write_cb(acb, 0);
return &acb->common;
}
-static void qcow_close(BlockDriverState *bs)
+static void qcow2_close(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
qemu_free(s->l1_table);
@@ -721,7 +726,7 @@ static int qcow2_update_ext_header(BlockDriverState *bs,
/* Prepare the backing file format extension if needed */
if (backing_fmt) {
ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt));
- ext_backing_fmt.magic = cpu_to_be32(QCOW_EXT_MAGIC_BACKING_FORMAT);
+ ext_backing_fmt.magic = cpu_to_be32(QCOW2_EXT_MAGIC_BACKING_FORMAT);
backing_fmt_len = ((sizeof(ext_backing_fmt)
+ strlen(backing_fmt) + 7) & ~7);
}
@@ -848,10 +853,10 @@ static int preallocate(BlockDriverState *bs)
return 0;
}
-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,
- QEMUOptionParameter *options)
+static int qcow2_create2(const char *filename, int64_t total_size,
+ const char *backing_file, const char *backing_format,
+ int flags, size_t cluster_size, int prealloc,
+ QEMUOptionParameter *options)
{
/* Calulate cluster_bits */
int cluster_bits;
@@ -974,7 +979,7 @@ out:
return ret;
}
-static int qcow_create(const char *filename, QEMUOptionParameter *options)
+static int qcow2_create(const char *filename, QEMUOptionParameter *options)
{
const char *backing_file = NULL;
const char *backing_fmt = NULL;
@@ -1017,11 +1022,11 @@ static int qcow_create(const char *filename, QEMUOptionParameter *options)
return -EINVAL;
}
- return qcow_create2(filename, sectors, backing_file, backing_fmt, flags,
- cluster_size, prealloc, options);
+ return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
+ cluster_size, prealloc, options);
}
-static int qcow_make_empty(BlockDriverState *bs)
+static int qcow2_make_empty(BlockDriverState *bs)
{
#if 0
/* XXX: not correct */
@@ -1080,8 +1085,8 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
/* 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)
+static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
{
BDRVQcowState *s = bs->opaque;
z_stream strm;
@@ -1148,32 +1153,33 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
return 0;
}
-static int qcow_flush(BlockDriverState *bs)
+static int qcow2_flush(BlockDriverState *bs)
{
return bdrv_flush(bs->file);
}
-static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
- BlockDriverCompletionFunc *cb, void *opaque)
+static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb,
+ void *opaque)
{
return bdrv_aio_flush(bs->file, cb, opaque);
}
-static int64_t qcow_vm_state_offset(BDRVQcowState *s)
+static int64_t qcow2_vm_state_offset(BDRVQcowState *s)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
}
-static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVQcowState *s = bs->opaque;
bdi->cluster_size = s->cluster_size;
- bdi->vm_state_offset = qcow_vm_state_offset(s);
+ bdi->vm_state_offset = qcow2_vm_state_offset(s);
return 0;
}
-static int qcow_check(BlockDriverState *bs, BdrvCheckResult *result)
+static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result)
{
return qcow2_check_refcounts(bs, result);
}
@@ -1199,8 +1205,8 @@ static void dump_refcounts(BlockDriverState *bs)
}
#endif
-static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
- int64_t pos, int size)
+static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
+ int64_t pos, int size)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
@@ -1208,14 +1214,14 @@ static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE);
bs->growable = 1;
- ret = bdrv_pwrite(bs, qcow_vm_state_offset(s) + pos, buf, size);
+ ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
return ret;
}
-static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf,
- int64_t pos, int size)
+static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf,
+ int64_t pos, int size)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
@@ -1223,13 +1229,13 @@ static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf,
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD);
bs->growable = 1;
- ret = bdrv_pread(bs, qcow_vm_state_offset(s) + pos, buf, size);
+ ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
return ret;
}
-static QEMUOptionParameter qcow_create_options[] = {
+static QEMUOptionParameter qcow2_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
@@ -1264,38 +1270,38 @@ static QEMUOptionParameter qcow_create_options[] = {
};
static BlockDriver bdrv_qcow2 = {
- .format_name = "qcow2",
- .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,
+ .format_name = "qcow2",
+ .instance_size = sizeof(BDRVQcowState),
+ .bdrv_probe = qcow2_probe,
+ .bdrv_open = qcow2_open,
+ .bdrv_close = qcow2_close,
+ .bdrv_create = qcow2_create,
+ .bdrv_flush = qcow2_flush,
+ .bdrv_is_allocated = qcow2_is_allocated,
+ .bdrv_set_key = qcow2_set_key,
+ .bdrv_make_empty = qcow2_make_empty,
+
+ .bdrv_aio_readv = qcow2_aio_readv,
+ .bdrv_aio_writev = qcow2_aio_writev,
+ .bdrv_aio_flush = qcow2_aio_flush,
.bdrv_truncate = qcow2_truncate,
- .bdrv_write_compressed = qcow_write_compressed,
+ .bdrv_write_compressed = qcow2_write_compressed,
.bdrv_snapshot_create = qcow2_snapshot_create,
.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_get_info = qcow2_get_info,
- .bdrv_save_vmstate = qcow_save_vmstate,
- .bdrv_load_vmstate = qcow_load_vmstate,
+ .bdrv_save_vmstate = qcow2_save_vmstate,
+ .bdrv_load_vmstate = qcow2_load_vmstate,
.bdrv_change_backing_file = qcow2_change_backing_file,
- .create_options = qcow_create_options,
- .bdrv_check = qcow_check,
+ .create_options = qcow2_create_options,
+ .bdrv_check = qcow2_check,
};
static void bdrv_qcow2_init(void)
generated by cgit v1.2.1 (git 2.18.0) at 2024-06-29 20:37:01 +0000