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qemu: Fix variable sizing issues with 'bandwidth' argument of qemuBlockCommit

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The patch moving the code didn't faithfully represent the typecasting
of the 'bandwidth' variable needed to properly convert from the legacy
'unsigned long' argument which resulted in a build failure on 32 bit
systems:

../src/qemu/qemu_block.c: In function ‘qemuBlockCommit’:
../src/qemu/qemu_block.c:3249:23: error: comparison is always false due to limited range of data type [-Werror=type-limits]
 3249 |         if (bandwidth > LLONG_MAX >> 20) {
      |                       ^

Fix it by returning the check into qemuDomainBlockCommit as it's needed
only because of the legacy argument type in the old API and use
'unsigned long long' for qemuBlockCommit.

Fixes: f5a77198bf
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Peter Krempa 2023-01-09 14:35:52 +01:00
parent 64366c0056
commit d9193ff92b
3 changed files with 16 additions and 15 deletions
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15
src/qemu/qemu_block.c
View File

@ -3205,7 +3205,7 @@ qemuBlockExportAddNBD(virDomainObj *vm,
* @baseSource: disk source within backing chain to commit data into
* @topSource: disk source within backing chain with data we will commit
* @top_parent: disk source that has @topSource as backing disk
* @bandwidth: bandwidth limit, flags determine the unit
* @bandwidth: bandwidth limit in bytes/s
* @asyncJob: qemu async job type
* @autofinalize: virTristateBool controlling qemu block job finalization
* @flags: bitwise-OR of virDomainBlockCommitFlags
@ -3227,7 +3227,7 @@ qemuBlockCommit(virDomainObj *vm,
virStorageSource *baseSource,
virStorageSource *topSource,
virStorageSource *top_parent,
unsigned long bandwidth,
unsigned long long bandwidth,
virDomainAsyncJob asyncJob,
virTristateBool autofinalize,
unsigned int flags)
@ -3244,17 +3244,6 @@ qemuBlockCommit(virDomainObj *vm,
if (virDomainObjCheckActive(vm) < 0)
return NULL;
/* Convert bandwidth MiB to bytes, if necessary */
if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_BANDWIDTH_BYTES)) {
if (bandwidth > LLONG_MAX >> 20) {
virReportError(VIR_ERR_OVERFLOW,
_("bandwidth must be less than %llu"),
LLONG_MAX >> 20);
return NULL;
}
bandwidth <<= 20;
}
if (!qemuDomainDiskBlockJobIsSupported(disk))
return NULL;

2
src/qemu/qemu_block.h
View File

@ -283,7 +283,7 @@ qemuBlockCommit(virDomainObj *vm,
virStorageSource *baseSource,
virStorageSource *topSource,
virStorageSource *top_parent,
unsigned long bandwidth,
unsigned long long bandwidth,
virDomainAsyncJob asyncJob,
virTristateBool autofinalize,
unsigned int flags);

14
src/qemu/qemu_driver.c
View File

@ -14994,6 +14994,7 @@ qemuDomainBlockCommit(virDomainPtr dom,
virStorageSource *topSource;
virStorageSource *baseSource = NULL;
virStorageSource *top_parent = NULL;
unsigned long long speed = bandwidth;
g_autoptr(qemuBlockJobData) job = NULL;
virCheckFlags(VIR_DOMAIN_BLOCK_COMMIT_SHALLOW |
@ -15011,6 +15012,17 @@ qemuDomainBlockCommit(virDomainPtr dom,
if (virDomainObjBeginJob(vm, VIR_JOB_MODIFY) < 0)
goto cleanup;
/* Convert bandwidth MiB to bytes, if necessary */
if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_BANDWIDTH_BYTES)) {
if (speed > LLONG_MAX >> 20) {
virReportError(VIR_ERR_OVERFLOW,
_("bandwidth must be less than %llu"),
LLONG_MAX >> 20);
goto endjob;
}
speed <<= 20;
}
if (!(disk = qemuDomainDiskByName(vm->def, path)))
goto endjob;
@ -15027,7 +15039,7 @@ qemuDomainBlockCommit(virDomainPtr dom,
goto endjob;
job = qemuBlockCommit(vm, disk, baseSource, topSource, top_parent,
bandwidth, VIR_ASYNC_JOB_NONE, VIR_TRISTATE_BOOL_YES,
speed, VIR_ASYNC_JOB_NONE, VIR_TRISTATE_BOOL_YES,
flags);
if (job)
ret = 0;