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[Qemu-devel] [PATCH 17/19] block: Use bdrv_dirname() for relative filena
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH 17/19] block: Use bdrv_dirname() for relative filenames |
Date: |
Tue, 26 Apr 2016 23:32:16 +0200 |
bdrv_get_full_backing_filename_from_filename() breaks down when it comes
to JSON filenames. Using bdrv_dirname() as the basis is better because
since we have BDS, we can descend through the BDS tree to the protocol
layer, which gives us a greater probability of finding a non-JSON name;
also, bdrv_dirname() is more correct as it allows block drivers to
override the generation of that directory name in a protocol-specific
way.
We still need to keep bdrv_get_full_backing_filename_from_filename(),
though, because it has valid callers which need it during image creation
when no BDS is available yet.
This makes a test case in qemu-iotest 110, which was supposed to fail,
work. That is actually good, but we need to change the reference output
(and the comment in 110) accordingly.
Signed-off-by: Max Reitz <address@hidden>
---
block.c | 20 +++++++++++++++-----
tests/qemu-iotests/110 | 3 ++-
tests/qemu-iotests/110.out | 2 +-
3 files changed, 18 insertions(+), 7 deletions(-)
diff --git a/block.c b/block.c
index 23962ce..a909b7a 100644
--- a/block.c
+++ b/block.c
@@ -212,12 +212,22 @@ char *bdrv_get_full_backing_filename_from_filename(const
char *backed,
static char *bdrv_make_absolute_filename(BlockDriverState *relative_to,
const char *filename, Error **errp)
{
- char *bs_filename = relative_to->exact_filename[0]
- ? relative_to->exact_filename
- : relative_to->filename;
+ char *dir, *full_name;
- return bdrv_get_full_backing_filename_from_filename(bs_filename, filename,
- errp);
+ if (filename[0] == '\0' || path_has_protocol(filename) ||
+ path_is_absolute(filename))
+ {
+ return g_strdup(filename);
+ }
+
+ dir = bdrv_dirname(relative_to, errp);
+ if (!dir) {
+ return NULL;
+ }
+
+ full_name = g_strconcat(dir, filename, NULL);
+ g_free(dir);
+ return full_name;
}
char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
diff --git a/tests/qemu-iotests/110 b/tests/qemu-iotests/110
index 9de7369..ba1b3c6 100755
--- a/tests/qemu-iotests/110
+++ b/tests/qemu-iotests/110
@@ -61,7 +61,8 @@ echo '=== Non-reconstructable filename ==='
echo
# Across blkdebug without a config file, you cannot reconstruct filenames, so
-# qemu is incapable of knowing the directory of the top image
+# qemu is incapable of knowing the directory of the top image from the filename
+# alone. However, using bdrv_dirname(), it should still work.
TEST_IMG="json:{
'driver': '$IMGFMT',
'file': {
diff --git a/tests/qemu-iotests/110.out b/tests/qemu-iotests/110.out
index b3584ff..5370bc1 100644
--- a/tests/qemu-iotests/110.out
+++ b/tests/qemu-iotests/110.out
@@ -14,7 +14,7 @@ backing file: t.IMGFMT.base (actual path:
TEST_DIR/t.IMGFMT.base)
image: json:{"driver": "IMGFMT", "file": {"set-state.0.event": "read_aio",
"image": {"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, "driver":
"blkdebug", "set-state.0.new_state": 42}}
file format: IMGFMT
virtual size: 64M (67108864 bytes)
-backing file: t.IMGFMT.base (cannot determine actual path)
+backing file: t.IMGFMT.base (actual path: TEST_DIR/t.IMGFMT.base)
=== Backing name is always relative to the backed image ===
--
2.8.0
- [Qemu-devel] [PATCH 06/19] block: Make bdrv_default_refresh_format_filename public, (continued)
- [Qemu-devel] [PATCH 06/19] block: Make bdrv_default_refresh_format_filename public, Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 07/19] qcow2: Implement bdrv_refresh_filename(), Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 10/19] block: bdrv_get_full_backing_filename's ret. val., Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 12/19] block: Fix bdrv_find_backing_image(), Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 08/19] block: Make path_combine() return the path, Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 15/19] quorum: Make bdrv_dirname() return NULL, Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 11/19] block: Add bdrv_make_absolute_filename(), Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 13/19] block: Add bdrv_dirname(), Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 14/19] blkverify: Make bdrv_dirname() return NULL, Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 16/19] block/nbd: Implement bdrv_dirname(), Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 17/19] block: Use bdrv_dirname() for relative filenames,
Max Reitz <=
- [Qemu-devel] [PATCH 18/19] block: Add 'base-directory' BDS option, Max Reitz, 2016/04/26
- [Qemu-devel] [PATCH 19/19] iotests: Add quorum case to test 110, Max Reitz, 2016/04/26