mirror of
https://github.com/ceph/ceph-csi.git
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109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
/*
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Copyright 2024 The Ceph-CSI Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package lock
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import (
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"context"
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"fmt"
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"syscall"
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"time"
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"github.com/ceph/go-ceph/rados"
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"github.com/ceph/ceph-csi/internal/util/log"
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)
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// IOCtxLock provides methods for acquiring and releasing exclusive locks on a volume.
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// using rados IO context locks.
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type IOCtxLock interface {
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LockExclusive(ctx context.Context) error
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Unlock(ctx context.Context)
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}
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type lock struct {
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volID string
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lockName string
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lockDesc string
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lockCookie string
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timeout time.Duration
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ioctx *rados.IOContext
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}
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// NewLock returns `lock` type that implements the IOCtxLock interface.
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func NewLock(
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ioctx *rados.IOContext,
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volID string,
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lockName string,
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lockCookie string,
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lockDesc string,
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timeout time.Duration,
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) IOCtxLock {
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return &lock{
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volID: volID,
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lockName: lockName,
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lockDesc: lockDesc,
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lockCookie: lockCookie,
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timeout: timeout,
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ioctx: ioctx,
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}
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}
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// LockExclusive acquires an exclusive lock on the volume identified by
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// the name and cookie pair.
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func (lck *lock) LockExclusive(ctx context.Context) error {
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var flags byte = 0
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ret, err := lck.ioctx.LockExclusive(
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lck.volID,
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lck.lockName,
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lck.lockCookie,
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lck.lockDesc,
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lck.timeout,
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&flags)
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if ret != 0 {
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switch ret {
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case -int(syscall.EBUSY):
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return fmt.Errorf("lock is already held by another client and cookie pair for %v volume",
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lck.volID)
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case -int(syscall.EEXIST):
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return fmt.Errorf("lock is already held by the same client and cookie pair for %v volume",
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lck.volID)
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default:
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return fmt.Errorf("failed to lock volume ID %v: %w", lck.volID, err)
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}
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}
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return nil
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}
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// Unlock releases the exclusive lock on the volume.
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func (lck *lock) Unlock(ctx context.Context) {
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ret, err := lck.ioctx.Unlock(lck.volID, lck.lockName, lck.lockCookie)
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switch ret {
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case 0:
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log.DebugLog(ctx, "lock %s for vol id %s successfully released ",
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lck.lockName, lck.volID)
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case -int(syscall.ENOENT):
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log.DebugLog(ctx, "lock is not held by the specified %s, %s pair",
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lck.lockCookie, lck.lockName)
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default:
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log.ErrorLog(ctx, "failed to release lock %s: %v",
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lck.lockName, err)
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}
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}
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