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virlockspace: Allow caller to specify start and length offset in virLockSpaceAcquireResource

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So far the virLockSpaceAcquireResource() locks the first byte in
the underlying file. But caller might want to lock other range.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michal Privoznik 2018-08-14 12:25:36 +02:00
parent b916a25e8a
commit afd5a27575
4 changed files with 41 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/locking/lock_daemon_dispatch.c
View File

@ -50,6 +50,8 @@ virLockSpaceProtocolDispatchAcquireResource(virNetServerPtr server ATTRIBUTE_UNU
virNetServerClientGetPrivateData(client);
virLockSpacePtr lockspace;
unsigned int newFlags;
off_t start = 0;
off_t len = 1;
virMutexLock(&priv->lock);
@ -84,6 +86,7 @@ virLockSpaceProtocolDispatchAcquireResource(virNetServerPtr server ATTRIBUTE_UNU
if (virLockSpaceAcquireResource(lockspace,
args->name,
priv->ownerPid,
start, len,
newFlags) < 0)
goto cleanup;

15
src/util/virlockspace.c
View File

@ -115,8 +115,10 @@ static void virLockSpaceResourceFree(virLockSpaceResourcePtr res)
static virLockSpaceResourcePtr
virLockSpaceResourceNew(virLockSpacePtr lockspace,
const char *resname,
unsigned int flags,
pid_t owner)
pid_t owner,
off_t start,
off_t len,
unsigned int flags)
{
virLockSpaceResourcePtr res;
bool shared = !!(flags & VIR_LOCK_SPACE_ACQUIRE_SHARED);
@ -157,7 +159,7 @@ virLockSpaceResourceNew(virLockSpacePtr lockspace,
goto error;
}
if (virFileLock(res->fd, shared, 0, 1, false) < 0) {
if (virFileLock(res->fd, shared, start, len, false) < 0) {
if (errno == EACCES || errno == EAGAIN) {
virReportError(VIR_ERR_RESOURCE_BUSY,
_("Lockspace resource '%s' is locked"),
@ -204,7 +206,7 @@ virLockSpaceResourceNew(virLockSpacePtr lockspace,
goto error;
}
if (virFileLock(res->fd, shared, 0, 1, false) < 0) {
if (virFileLock(res->fd, shared, start, len, false) < 0) {
if (errno == EACCES || errno == EAGAIN) {
virReportError(VIR_ERR_RESOURCE_BUSY,
_("Lockspace resource '%s' is locked"),
@ -612,6 +614,8 @@ int virLockSpaceDeleteResource(virLockSpacePtr lockspace,
int virLockSpaceAcquireResource(virLockSpacePtr lockspace,
const char *resname,
pid_t owner,
off_t start,
off_t len,
unsigned int flags)
{
int ret = -1;
@ -641,7 +645,8 @@ int virLockSpaceAcquireResource(virLockSpacePtr lockspace,
goto cleanup;
}
if (!(res = virLockSpaceResourceNew(lockspace, resname, flags, owner)))
if (!(res = virLockSpaceResourceNew(lockspace, resname,
owner, start, len, flags)))
goto cleanup;
if (virHashAddEntry(lockspace->resources, resname, res) < 0) {

4
src/util/virlockspace.h
View File

@ -22,6 +22,8 @@
#ifndef __VIR_LOCK_SPACE_H__
# define __VIR_LOCK_SPACE_H__
# include <sys/types.h>
# include "internal.h"
# include "virjson.h"
@ -50,6 +52,8 @@ typedef enum {
int virLockSpaceAcquireResource(virLockSpacePtr lockspace,
const char *resname,
pid_t owner,
off_t start,
off_t len,
unsigned int flags);
int virLockSpaceReleaseResource(virLockSpacePtr lockspace,

29
tests/virlockspacetest.c
View File

@ -99,6 +99,8 @@ static int testLockSpaceResourceLockExcl(const void *args ATTRIBUTE_UNUSED)
{
virLockSpacePtr lockspace;
int ret = -1;
const off_t start = 0;
const off_t len = 1;
rmdir(LOCKSPACE_DIR);
@ -111,13 +113,13 @@ static int testLockSpaceResourceLockExcl(const void *args ATTRIBUTE_UNUSED)
if (virLockSpaceCreateResource(lockspace, "foo") < 0)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(), 0) < 0)
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(), start, len, 0) < 0)
goto cleanup;
if (!virFileExists(LOCKSPACE_DIR "/foo"))
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(), 0) == 0)
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(), start, len, 0) == 0)
goto cleanup;
if (virLockSpaceDeleteResource(lockspace, "foo") == 0)
@ -145,6 +147,8 @@ static int testLockSpaceResourceLockExclAuto(const void *args ATTRIBUTE_UNUSED)
{
virLockSpacePtr lockspace;
int ret = -1;
const off_t start = 0;
const off_t len = 1;
rmdir(LOCKSPACE_DIR);
@ -158,6 +162,7 @@ static int testLockSpaceResourceLockExclAuto(const void *args ATTRIBUTE_UNUSED)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE) < 0)
goto cleanup;
@ -183,6 +188,8 @@ static int testLockSpaceResourceLockShr(const void *args ATTRIBUTE_UNUSED)
{
virLockSpacePtr lockspace;
int ret = -1;
const off_t start = 0;
const off_t len = 1;
rmdir(LOCKSPACE_DIR);
@ -196,13 +203,16 @@ static int testLockSpaceResourceLockShr(const void *args ATTRIBUTE_UNUSED)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_SHARED) < 0)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(), 0) == 0)
if (virLockSpaceAcquireResource(lockspace, "foo",
geteuid(), start, len, 0) == 0)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_SHARED) < 0)
goto cleanup;
@ -237,6 +247,8 @@ static int testLockSpaceResourceLockShrAuto(const void *args ATTRIBUTE_UNUSED)
{
virLockSpacePtr lockspace;
int ret = -1;
const off_t start = 0;
const off_t len = 1;
rmdir(LOCKSPACE_DIR);
@ -250,6 +262,7 @@ static int testLockSpaceResourceLockShrAuto(const void *args ATTRIBUTE_UNUSED)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_SHARED |
VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE) < 0)
goto cleanup;
@ -258,6 +271,7 @@ static int testLockSpaceResourceLockShrAuto(const void *args ATTRIBUTE_UNUSED)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE) == 0)
goto cleanup;
@ -265,6 +279,7 @@ static int testLockSpaceResourceLockShrAuto(const void *args ATTRIBUTE_UNUSED)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, "foo", geteuid(),
start, len,
VIR_LOCK_SPACE_ACQUIRE_SHARED |
VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE) < 0)
goto cleanup;
@ -297,6 +312,8 @@ static int testLockSpaceResourceLockPath(const void *args ATTRIBUTE_UNUSED)
{
virLockSpacePtr lockspace;
int ret = -1;
const off_t start = 0;
const off_t len = 1;
rmdir(LOCKSPACE_DIR);
@ -309,13 +326,15 @@ static int testLockSpaceResourceLockPath(const void *args ATTRIBUTE_UNUSED)
if (virLockSpaceCreateResource(lockspace, LOCKSPACE_DIR "/foo") < 0)
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, LOCKSPACE_DIR "/foo", geteuid(), 0) < 0)
if (virLockSpaceAcquireResource(lockspace, LOCKSPACE_DIR "/foo",
geteuid(), start, len, 0) < 0)
goto cleanup;
if (!virFileExists(LOCKSPACE_DIR "/foo"))
goto cleanup;
if (virLockSpaceAcquireResource(lockspace, LOCKSPACE_DIR "/foo", geteuid(), 0) == 0)
if (virLockSpaceAcquireResource(lockspace, LOCKSPACE_DIR "/foo",
geteuid(), start, len, 0) == 0)
goto cleanup;
if (virLockSpaceDeleteResource(lockspace, LOCKSPACE_DIR "/foo") == 0)