mirror of
https://github.com/minio/minio.git
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9a012a53ef
This PR fixes a bug that perhaps has been long introduced, with no visible workarounds. In any deployment, if an entire erasure set is deleted, there is no way the cluster recovers.
114 lines
3.8 KiB
Go
114 lines
3.8 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"context"
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"os"
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"os/exec"
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"runtime"
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"syscall"
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xioutil "github.com/minio/minio/internal/ioutil"
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)
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// Type of service signals currently supported.
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type serviceSignal int
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const (
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serviceRestart serviceSignal = iota // Restarts the server.
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serviceStop // Stops the server.
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serviceReloadDynamic // Reload dynamic config values.
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serviceFreeze // Freeze all S3 API calls.
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serviceUnFreeze // Un-Freeze previously frozen S3 API calls.
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// Add new service requests here.
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)
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// Global service signal channel.
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var globalServiceSignalCh = make(chan serviceSignal)
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// GlobalContext context that is canceled when server is requested to shut down.
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// cancelGlobalContext can be used to indicate server shutdown.
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var GlobalContext, cancelGlobalContext = context.WithCancel(context.Background())
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// restartProcess starts a new process passing it the active fd's. It
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// doesn't fork, but starts a new process using the same environment and
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// arguments as when it was originally started. This allows for a newly
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// deployed binary to be started. It returns the pid of the newly started
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// process when successful.
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func restartProcess() error {
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if runtime.GOOS == globalWindowsOSName {
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cmd := exec.Command(os.Args[0], os.Args[1:]...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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cmd.Stdin = os.Stdin
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cmd.Env = os.Environ()
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err := cmd.Run()
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if err == nil {
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os.Exit(0)
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}
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return err
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}
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// Use the original binary location. This works with symlinks such that if
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// the file it points to has been changed we will use the updated symlink.
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argv0, err := exec.LookPath(os.Args[0])
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if err != nil {
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return err
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}
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// Invokes the execve system call.
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// Re-uses the same pid. This preserves the pid over multiple server-respawns.
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return syscall.Exec(argv0, os.Args, os.Environ())
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}
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// freezeServices will freeze all incoming S3 API calls.
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// For each call, unfreezeServices must be called once.
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func freezeServices() {
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// Use atomics for globalServiceFreeze, so we can read without locking.
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// We need a lock since we are need the 2 atomic values to remain in sync.
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globalServiceFreezeMu.Lock()
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// If multiple calls, first one creates channel.
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globalServiceFreezeCnt++
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if globalServiceFreezeCnt == 1 {
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globalServiceFreeze.Store(make(chan struct{}))
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}
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globalServiceFreezeMu.Unlock()
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}
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// unfreezeServices will unfreeze all incoming S3 API calls.
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// For each call, unfreezeServices must be called once.
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func unfreezeServices() {
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// We need a lock since we need the 2 atomic values to remain in sync.
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globalServiceFreezeMu.Lock()
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// Close when we reach 0
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globalServiceFreezeCnt--
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if globalServiceFreezeCnt <= 0 {
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// Set to a nil channel.
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var _ch chan struct{}
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if val := globalServiceFreeze.Swap(_ch); val != nil {
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if ch, ok := val.(chan struct{}); ok && ch != nil {
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// Close previous non-nil channel.
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xioutil.SafeClose(ch)
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}
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}
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globalServiceFreezeCnt = 0 // Don't risk going negative.
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}
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globalServiceFreezeMu.Unlock()
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}
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