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qemu-img: Use child access functions

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This changes iotest 204's output, because blkdebug on top of a COW node
used to make qemu-img map disregard the rest of the backing chain (the
backing chain was broken by the filter).  With this patch, the
allocation in the base image is reported correctly.

Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 19:00:30 +02:00 committed by Kevin Wolf
parent ee2f94ca27
commit 4a2061e66d
2 changed files with 27 additions and 17 deletions
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43
qemu-img.c
View File

@ -1085,7 +1085,7 @@ static int img_commit(int argc, char **argv)
/* 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;
@ -1732,18 +1732,20 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
if (s->sector_next_status <= sector_num) {
uint64_t offset = (sector_num - src_cur_offset) * BDRV_SECTOR_SIZE;
int64_t count;
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) {
@ -2665,7 +2667,8 @@ static int img_convert(int argc, char **argv)
* 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;
}
@ -3035,6 +3038,7 @@ static int get_block_status(BlockDriverState *bs, int64_t offset,
depth = 0;
for (;;) {
bs = bdrv_skip_filters(bs);
ret = bdrv_block_status(bs, offset, bytes, &bytes, &map, &file);
if (ret < 0) {
return ret;
@ -3043,7 +3047,7 @@ static int get_block_status(BlockDriverState *bs, int64_t offset,
if (ret & (BDRV_BLOCK_ZERO|BDRV_BLOCK_DATA)) {
break;
}
bs = backing_bs(bs);
bs = bdrv_cow_bs(bs);
if (bs == NULL) {
ret = 0;
break;
@ -3425,6 +3429,7 @@ static int img_rebase(int argc, char **argv)
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;
@ -3559,6 +3564,8 @@ static int img_rebase(int argc, char **argv)
}
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);
@ -3570,7 +3577,7 @@ static int img_rebase(int argc, char **argv)
/* 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(),
@ -3711,7 +3718,7 @@ static int img_rebase(int argc, char **argv)
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));
@ -3726,8 +3733,9 @@ static int img_rebase(int argc, char **argv)
* 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));
@ -3805,9 +3813,10 @@ static int img_rebase(int argc, char **argv)
* 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) {

1
tests/qemu-iotests/204.out
View File

@ -59,5 +59,6 @@ Offset Length File
0x900000 0x2400000 TEST_DIR/t.IMGFMT
0x3c00000 0x1100000 TEST_DIR/t.IMGFMT
0x6a00000 0x400000 TEST_DIR/t.IMGFMT
0x6e00000 0x1200000 TEST_DIR/t.IMGFMT.base
No errors were found on the image.
*** done