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qemu: blockcopy: Refactor logic checking the target storage file

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Use virStorageSource accessors to check the file and call
virStorageFileAccess before even attempting to stat the target. This
will be helpful once we try to add network destinations for block copy,
since there will be no need to stat them.
This commit is contained in:
Peter Krempa 2017-07-11 17:45:12 +02:00
parent 5f14a0f2fb
commit 703abf1d79
1 changed files with 35 additions and 22 deletions
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57
src/qemu/qemu_driver.c
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@ -16692,36 +16692,49 @@ qemuDomainBlockCopyValidateMirror(virStorageSourcePtr mirror,
int desttype = virStorageSourceGetActualType(mirror);
struct stat st;
if (stat(mirror->path, &st) < 0) {
if (virStorageFileAccess(mirror, F_OK) < 0) {
if (errno != ENOENT) {
virReportSystemError(errno, _("unable to stat for disk %s: %s"),
dst, mirror->path);
virReportSystemError(errno, "%s",
_("unable to verify existance of "
"block copy target"));
return -1;
} else if (*reuse || desttype == VIR_STORAGE_TYPE_BLOCK) {
}
if (*reuse || desttype == VIR_STORAGE_TYPE_BLOCK) {
virReportSystemError(errno,
_("missing destination file for disk %s: %s"),
dst, mirror->path);
return -1;
}
} else if (!S_ISBLK(st.st_mode)) {
if (st.st_size && !(*reuse)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("external destination file for disk %s already "
"exists and is not a block device: %s"),
dst, mirror->path);
return -1;
}
if (desttype == VIR_STORAGE_TYPE_BLOCK) {
virReportError(VIR_ERR_INVALID_ARG,
_("blockdev flag requested for disk %s, but file "
"'%s' is not a block device"),
dst, mirror->path);
return -1;
}
} else {
/* if the target is a block device, assume that we are reusing it, so
* there are no attempts to create it */
*reuse = true;
if (virStorageFileStat(mirror, &st) < 0) {
virReportSystemError(errno,
_("unable to stat block copy target '%s'"),
mirror->path);
return -1;
}
if (S_ISBLK(st.st_mode)) {
/* if the target is a block device, assume that we are reusing it,
* so there are no attempts to create it */
*reuse = true;
} else {
if (st.st_size && !(*reuse)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("external destination file for disk %s already "
"exists and is not a block device: %s"),
dst, mirror->path);
return -1;
}
if (desttype == VIR_STORAGE_TYPE_BLOCK) {
virReportError(VIR_ERR_INVALID_ARG,
_("blockdev flag requested for disk %s, but file "
"'%s' is not a block device"),
dst, mirror->path);
return -1;
}
}
}
return 0;