/* This is different from QMP, which by default uses the deepest file in
* the backing chain (i.e., the very base); however, the traditional
* behavior of qemu-img commit is using the immediate backing file. */
- base_bs = backing_bs(bs);
+ base_bs = bdrv_backing_chain_next(bs);
if (!base_bs) {
error_setg(&local_err, "Image does not have a backing file");
goto done;
* 'pnum' is set to the number of sectors (including and immediately following
* the first one) that are known to be in the same allocated/unallocated state.
* The function will try to align the end offset to alignment boundaries so
- * that the request will at least end aligned and consequtive requests will
+ * that the request will at least end aligned and consecutive requests will
* also start at an aligned offset.
*/
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum,
*pnum = 0;
return 0;
}
- is_zero = buffer_is_zero(buf, 512);
+ is_zero = buffer_is_zero(buf, BDRV_SECTOR_SIZE);
for(i = 1; i < n; i++) {
- buf += 512;
- if (is_zero != buffer_is_zero(buf, 512)) {
+ buf += BDRV_SECTOR_SIZE;
+ if (is_zero != buffer_is_zero(buf, BDRV_SECTOR_SIZE)) {
break;
}
}
typedef struct ImgConvertState {
BlockBackend **src;
int64_t *src_sectors;
+ int *src_alignment;
int src_num;
int64_t total_sectors;
int64_t allocated_sectors;
if (s->sector_next_status <= sector_num) {
uint64_t offset = (sector_num - src_cur_offset) * BDRV_SECTOR_SIZE;
int64_t count;
+ int tail;
+ BlockDriverState *src_bs = blk_bs(s->src[src_cur]);
+ BlockDriverState *base;
+
+ if (s->target_has_backing) {
+ base = bdrv_cow_bs(bdrv_skip_filters(src_bs));
+ } else {
+ base = NULL;
+ }
do {
count = n * BDRV_SECTOR_SIZE;
- if (s->target_has_backing) {
- ret = bdrv_block_status(blk_bs(s->src[src_cur]), offset,
- count, &count, NULL, NULL);
- } else {
- ret = bdrv_block_status_above(blk_bs(s->src[src_cur]), NULL,
- offset, count, &count, NULL,
- NULL);
- }
+ ret = bdrv_block_status_above(src_bs, base, offset, count, &count,
+ NULL, NULL);
if (ret < 0) {
if (s->salvage) {
n = DIV_ROUND_UP(count, BDRV_SECTOR_SIZE);
+ /*
+ * Avoid that s->sector_next_status becomes unaligned to the source
+ * request alignment and/or cluster size to avoid unnecessary read
+ * cycles.
+ */
+ tail = (sector_num - src_cur_offset + n) % s->src_alignment[src_cur];
+ if (n > tail) {
+ n -= tail;
+ }
+
if (ret & BDRV_BLOCK_ZERO) {
s->status = post_backing_zero ? BLK_BACKING_FILE : BLK_ZERO;
} else if (ret & BDRV_BLOCK_DATA) {
s.src = g_new0(BlockBackend *, s.src_num);
s.src_sectors = g_new(int64_t, s.src_num);
+ s.src_alignment = g_new(int, s.src_num);
for (bs_i = 0; bs_i < s.src_num; bs_i++) {
+ BlockDriverState *src_bs;
s.src[bs_i] = img_open(image_opts, argv[optind + bs_i],
fmt, src_flags, src_writethrough, s.quiet,
force_share);
ret = -1;
goto out;
}
+ src_bs = blk_bs(s.src[bs_i]);
+ s.src_alignment[bs_i] = DIV_ROUND_UP(src_bs->bl.request_alignment,
+ BDRV_SECTOR_SIZE);
+ if (!bdrv_get_info(src_bs, &bdi)) {
+ s.src_alignment[bs_i] = MAX(s.src_alignment[bs_i],
+ bdi.cluster_size / BDRV_SECTOR_SIZE);
+ }
s.total_sectors += s.src_sectors[bs_i];
}
}
}
- qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s.total_sectors * 512,
- &error_abort);
+ qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
+ s.total_sectors * BDRV_SECTOR_SIZE, &error_abort);
ret = add_old_style_options(out_fmt, opts, out_baseimg, NULL);
if (ret < 0) {
goto out;
* s.target_backing_sectors has to be negative, which it will
* be automatically). The backing file length is used only
* for optimizations, so such a case is not fatal. */
- s.target_backing_sectors = bdrv_nb_sectors(out_bs->backing->bs);
+ s.target_backing_sectors =
+ bdrv_nb_sectors(bdrv_backing_chain_next(out_bs));
} else {
s.target_backing_sectors = -1;
}
g_free(s.src);
}
g_free(s.src_sectors);
+ g_free(s.src_alignment);
fail_getopt:
g_free(options);
depth = 0;
for (;;) {
+ bs = bdrv_skip_filters(bs);
ret = bdrv_block_status(bs, offset, bytes, &bytes, &map, &file);
if (ret < 0) {
return ret;
if (ret & (BDRV_BLOCK_ZERO|BDRV_BLOCK_DATA)) {
break;
}
- bs = backing_bs(bs);
+ bs = bdrv_cow_bs(bs);
if (bs == NULL) {
ret = 0;
break;
uint8_t *buf_old = NULL;
uint8_t *buf_new = NULL;
BlockDriverState *bs = NULL, *prefix_chain_bs = NULL;
+ BlockDriverState *unfiltered_bs;
char *filename;
const char *fmt, *cache, *src_cache, *out_basefmt, *out_baseimg;
int c, flags, src_flags, ret;
}
bs = blk_bs(blk);
+ unfiltered_bs = bdrv_skip_filters(bs);
+
if (out_basefmt != NULL) {
if (bdrv_find_format(out_basefmt) == NULL) {
error_report("Invalid format name: '%s'", out_basefmt);
/* For safe rebasing we need to compare old and new backing file */
if (!unsafe) {
QDict *options = NULL;
- BlockDriverState *base_bs = backing_bs(bs);
+ BlockDriverState *base_bs = bdrv_cow_bs(unfiltered_bs);
if (base_bs) {
blk_old_backing = blk_new(qemu_get_aio_context(),
n = MIN(IO_BUF_SIZE, size - offset);
/* If the cluster is allocated, we don't need to take action */
- ret = bdrv_is_allocated(bs, offset, n, &n);
+ ret = bdrv_is_allocated(unfiltered_bs, offset, n, &n);
if (ret < 0) {
error_report("error while reading image metadata: %s",
strerror(-ret));
* If cluster wasn't changed since prefix_chain, we don't need
* to take action
*/
- ret = bdrv_is_allocated_above(backing_bs(bs), prefix_chain_bs,
- false, offset, n, &n);
+ ret = bdrv_is_allocated_above(bdrv_cow_bs(unfiltered_bs),
+ prefix_chain_bs, false,
+ offset, n, &n);
if (ret < 0) {
error_report("error while reading image metadata: %s",
strerror(-ret));
* doesn't change when we switch the backing file.
*/
if (out_baseimg && *out_baseimg) {
- ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt, true);
+ ret = bdrv_change_backing_file(unfiltered_bs, out_baseimg, out_basefmt,
+ true);
} else {
- ret = bdrv_change_backing_file(bs, NULL, NULL, false);
+ ret = bdrv_change_backing_file(unfiltered_bs, NULL, NULL, false);
}
if (ret == -ENOSPC) {
filename = argv[optind];
bitmap = argv[optind + 1];
- blk = img_open(image_opts, filename, fmt, BDRV_O_RDWR, false, false,
- false);
+ /*
+ * No need to open backing chains; we will be manipulating bitmaps
+ * directly in this image without reference to image contents.
+ */
+ blk = img_open(image_opts, filename, fmt, BDRV_O_RDWR | BDRV_O_NO_BACKING,
+ false, false, false);
if (!blk) {
goto out;
}
bs = blk_bs(blk);
if (src_filename) {
- src = img_open(false, src_filename, src_fmt, 0, false, false, false);
+ src = img_open(false, src_filename, src_fmt, BDRV_O_NO_BACKING,
+ false, false, false);
if (!src) {
goto out;
}
projects / mirror_qemu.git / blobdiff