Re: [Qemu-devel] [PATCH for-1.7 v2] block: Print its file name if backing file opening failed
On Fri, Nov 08, 2013 at 11:26:49AM +0800, Fam Zheng wrote: If backing file doesn't exist, the error message is confusing and misleading: $ qemu /tmp/a.qcow2 qemu: could not open disk image /tmp/a.qcow2: Could not open file: No such file or directory But... $ ls /tmp/a.qcow2 /tmp/a.qcow2 $ qemu-img info /tmp/a.qcow2 image: /tmp/a.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 196K cluster_size: 65536 backing file: /tmp/b.qcow2 Because... $ ls /tmp/b.qcow2 ls: cannot access /tmp/b.qcow2: No such file or directory This is not intuitive. It's better to have the missing file's name in the error message. With this patch: $ qemu-io -c 'read 0 512' /tmp/a.qcow2 qemu-io: can't open device /tmp/a.qcow2: Could not open backing file: Could not open '/stor/vm/arch.raw': No such file or directory no file open, try 'help open' Which is a little bit better. Signed-off-by: Fam Zheng f...@redhat.com --- v2: Don't leak local_err (Eric). Signed-off-by: Fam Zheng f...@redhat.com --- block.c| 4 +++- block/raw-posix.c | 1 - block/raw-win32.c | 1 - tests/qemu-iotests/051.out | 2 +- tests/qemu-iotests/069.out | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) Reviewed-by: Stefan Hajnoczi stefa...@redhat.com
Re: [Qemu-devel] [PATCH for-1.7 v2] block: Print its file name if backing file opening failed
Am 08.11.2013 um 04:26 hat Fam Zheng geschrieben: If backing file doesn't exist, the error message is confusing and misleading: $ qemu /tmp/a.qcow2 qemu: could not open disk image /tmp/a.qcow2: Could not open file: No such file or directory But... $ ls /tmp/a.qcow2 /tmp/a.qcow2 $ qemu-img info /tmp/a.qcow2 image: /tmp/a.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 196K cluster_size: 65536 backing file: /tmp/b.qcow2 Because... $ ls /tmp/b.qcow2 ls: cannot access /tmp/b.qcow2: No such file or directory This is not intuitive. It's better to have the missing file's name in the error message. With this patch: $ qemu-io -c 'read 0 512' /tmp/a.qcow2 qemu-io: can't open device /tmp/a.qcow2: Could not open backing file: Could not open '/stor/vm/arch.raw': No such file or directory no file open, try 'help open' Which is a little bit better. Signed-off-by: Fam Zheng f...@redhat.com Thanks, applied to the block branch. However, while this may be an improvement, it's certainly not what we'd want the error message to look like in the final state. Consider a chain with multiple backing files: qemu-system-x86_64: -drive file=/tmp/d.qcow2: could not open disk image /tmp/d.qcow2: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open '/tmp/blubber': No such file or directory Kevin
Re: [Qemu-devel] [PATCH for-1.7 v2] block: Print its file name if backing file opening failed
On 11/07/2013 08:26 PM, Fam Zheng wrote: If backing file doesn't exist, the error message is confusing and misleading: $ qemu /tmp/a.qcow2 qemu: could not open disk image /tmp/a.qcow2: Could not open file: No such file or directory This is not intuitive. It's better to have the missing file's name in the error message. With this patch: $ qemu-io -c 'read 0 512' /tmp/a.qcow2 qemu-io: can't open device /tmp/a.qcow2: Could not open backing file: Could not open '/stor/vm/arch.raw': No such file or directory no file open, try 'help open' Which is a little bit better. Signed-off-by: Fam Zheng f...@redhat.com --- v2: Don't leak local_err (Eric). Thanks. Reviewed-by: Eric Blake ebl...@redhat.com -- Eric Blake eblake redhat com+1-919-301-3266 Libvirt virtualization library http://libvirt.org signature.asc Description: OpenPGP digital signature
[Qemu-devel] [PATCH for-1.7 v2] block: Print its file name if backing file opening failed
If backing file doesn't exist, the error message is confusing and
misleading:
$ qemu /tmp/a.qcow2
qemu: could not open disk image /tmp/a.qcow2: Could not open file: No
such file or directory
But...
$ ls /tmp/a.qcow2
/tmp/a.qcow2
$ qemu-img info /tmp/a.qcow2
image: /tmp/a.qcow2
file format: qcow2
virtual size: 8.0G (8589934592 bytes)
disk size: 196K
cluster_size: 65536
backing file: /tmp/b.qcow2
Because...
$ ls /tmp/b.qcow2
ls: cannot access /tmp/b.qcow2: No such file or directory
This is not intuitive. It's better to have the missing file's name in
the error message. With this patch:
$ qemu-io -c 'read 0 512' /tmp/a.qcow2
qemu-io: can't open device /tmp/a.qcow2: Could not open backing
file: Could not open '/stor/vm/arch.raw': No such file or directory
no file open, try 'help open'
Which is a little bit better.
Signed-off-by: Fam Zheng f...@redhat.com
---
v2: Don't leak local_err (Eric).
Signed-off-by: Fam Zheng f...@redhat.com
---
block.c| 4 +++-
block/raw-posix.c | 1 -
block/raw-win32.c | 1 -
tests/qemu-iotests/051.out | 2 +-
tests/qemu-iotests/069.out | 2 +-
5 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/block.c b/block.c
index f706634..7ffb08b 100644
--- a/block.c
+++ b/block.c
@@ -1009,7 +1009,9 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*options, Error **errp)
bdrv_unref(bs-backing_hd);
bs-backing_hd = NULL;
bs-open_flags |= BDRV_O_NO_BACKING;
-error_propagate(errp, local_err);
+error_setg(errp, Could not open backing file: %s,
+ error_get_pretty(local_err));
+error_free(local_err);
return ret;
}
pstrcpy(bs-backing_file, sizeof(bs-backing_file),
diff --git a/block/raw-posix.c b/block/raw-posix.c
index f6d48bb..e1b1ba2 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -310,7 +310,6 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
if (ret == -EROFS) {
ret = -EACCES;
}
-error_setg_errno(errp, -ret, Could not open file);
goto fail;
}
s-fd = fd;
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 2741e4d..2bad5a3 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -280,7 +280,6 @@ static int raw_open(BlockDriverState *bs, QDict *options,
int flags,
} else {
ret = -EINVAL;
}
-error_setg_errno(errp, -ret, Could not open file);
goto fail;
}
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 15deef6..d351935 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -226,6 +226,6 @@ Testing: -drive file=foo:bar
QEMU_PROG: -drive file=foo:bar: could not open disk image foo:bar: Unknown
protocol
Testing: -drive file.filename=foo:bar
-QEMU_PROG: -drive file.filename=foo:bar: could not open disk image ide0-hd0:
Could not open file: No such file or directory
+QEMU_PROG: -drive file.filename=foo:bar: could not open disk image ide0-hd0:
Could not open 'foo:bar': No such file or directory
*** done
diff --git a/tests/qemu-iotests/069.out b/tests/qemu-iotests/069.out
index 3648814..b48306d 100644
--- a/tests/qemu-iotests/069.out
+++ b/tests/qemu-iotests/069.out
@@ -4,5 +4,5 @@ QA output created by 069
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=131072
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=131072
backing_file='TEST_DIR/t.IMGFMT.base'
-qemu-io: can't open device TEST_DIR/t.IMGFMT: Could not open file: No such
file or directory
+qemu-io: can't open device TEST_DIR/t.IMGFMT: Could not open backing file:
Could not open 'TEST_DIR/t.IMGFMT.base': No such file or directory
*** done
--
1.8.3.1
