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Use virFileOperation hook function in virStorageBackendFileSystemVolBuild

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There were a few operations on the storage volume file that were still
being done as root, which will fail if the file is on a root-squashed
NFS share. The result was that attempts to create a storage volume of
type "raw" on a root-squashed NFS share would fail.

This patch uses the newly introduced "hook" function in
virFileOperation to execute all those file operations in the child
process that's run under the uid that owns the file (and, presumably,
has permission to write to the NFS share)

* src/storage/storage_backend.c: use virFileOperation() in
  virStorageBackendCreateRaw, turning virStorageBackendCreateRaw()
  into a new createRawFileOpHook() hook
This commit is contained in:
Laine Stump 2010-02-19 18:12:01 +01:00 committed by Daniel Veillard
parent fbadc2b608
commit 6ef20bb7ae
1 changed files with 54 additions and 59 deletions
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113
src/storage/storage_backend.c
View File

@ -270,61 +270,33 @@ cleanup:
return ret;
}
int
virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags ATTRIBUTE_UNUSED)
{
int fd = -1;
int ret = -1;
int createstat;
struct createRawFileOpHookData {
virStorageVolDefPtr vol;
virStorageVolDefPtr inputvol;
};
static int createRawFileOpHook(int fd, void *data) {
struct createRawFileOpHookData *hdata = data;
int ret = 0;
unsigned long long remain;
char *buf = NULL;
if (vol->target.encryption != NULL) {
virStorageReportError(VIR_ERR_NO_SUPPORT,
"%s", _("storage pool does not support encrypted "
"volumes"));
return -1;
}
if ((createstat = virFileOperation(vol->target.path, O_RDWR | O_CREAT | O_EXCL,
vol->target.perms.mode,
vol->target.perms.uid, vol->target.perms.gid,
NULL, NULL,
VIR_FILE_OP_FORCE_PERMS |
(pool->def->type == VIR_STORAGE_POOL_NETFS
? VIR_FILE_OP_AS_UID : 0))) < 0) {
virReportSystemError(createstat,
_("cannot create path '%s'"),
vol->target.path);
goto cleanup;
}
if ((fd = open(vol->target.path, O_RDWR | O_EXCL | O_DSYNC)) < 0) {
virReportSystemError(errno,
_("cannot open new path '%s'"),
vol->target.path);
goto cleanup;
}
/* Seek to the final size, so the capacity is available upfront
* for progress reporting */
if (ftruncate(fd, vol->capacity) < 0) {
if (ftruncate(fd, hdata->vol->capacity) < 0) {
ret = errno;
virReportSystemError(errno,
_("cannot extend file '%s'"),
vol->target.path);
hdata->vol->target.path);
goto cleanup;
}
remain = vol->allocation;
remain = hdata->vol->allocation;
if (inputvol) {
int res = virStorageBackendCopyToFD(vol, inputvol,
if (hdata->inputvol) {
int res = virStorageBackendCopyToFD(hdata->vol, hdata->inputvol,
fd, &remain, 1);
if (res < 0)
ret = -res;
goto cleanup;
}
@ -341,11 +313,11 @@ virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
if (bytes > remain)
bytes = remain;
if ((r = safezero(fd, 0, vol->allocation - remain,
if ((r = safezero(fd, 0, hdata->vol->allocation - remain,
bytes)) != 0) {
virReportSystemError(r,
_("cannot fill file '%s'"),
vol->target.path);
ret = errno;
virReportSystemError(r, _("cannot fill file '%s'"),
hdata->vol->target.path);
goto cleanup;
}
remain -= bytes;
@ -354,28 +326,51 @@ virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
int r;
if ((r = safezero(fd, 0, 0, remain)) != 0) {
virReportSystemError(r,
_("cannot fill file '%s'"),
vol->target.path);
ret = errno;
virReportSystemError(r, _("cannot fill file '%s'"),
hdata->vol->target.path);
goto cleanup;
}
}
}
if (close(fd) < 0) {
virReportSystemError(errno,
_("cannot close file '%s'"),
vol->target.path);
cleanup:
return ret;
}
int
virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool,
virStorageVolDefPtr vol,
virStorageVolDefPtr inputvol,
unsigned int flags ATTRIBUTE_UNUSED)
{
int ret = -1;
int createstat;
struct createRawFileOpHookData hdata = { vol, inputvol };
if (vol->target.encryption != NULL) {
virStorageReportError(VIR_ERR_NO_SUPPORT,
"%s", _("storage pool does not support encrypted "
"volumes"));
goto cleanup;
}
fd = -1;
if ((createstat = virFileOperation(vol->target.path, O_RDWR | O_CREAT | O_EXCL,
vol->target.perms.mode,
vol->target.perms.uid, vol->target.perms.gid,
createRawFileOpHook, &hdata,
VIR_FILE_OP_FORCE_PERMS |
(pool->def->type == VIR_STORAGE_POOL_NETFS
? VIR_FILE_OP_AS_UID : 0))) < 0) {
virReportSystemError(createstat,
_("cannot create path '%s'"),
vol->target.path);
goto cleanup;
}
ret = 0;
cleanup:
if (fd != -1)
close(fd);
VIR_FREE(buf);
return ret;
}