get.pme.sh/pnats@v0.0.0-20240304004023-26bb5a137ed0/server/disk_avail.go (about)

     1  // Copyright 2020-2022 The NATS Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  //go:build !windows && !openbsd && !netbsd && !wasm
    15  // +build !windows,!openbsd,!netbsd,!wasm
    16  
    17  package server
    18  
    19  import (
    20  	"os"
    21  	"syscall"
    22  )
    23  
    24  func diskAvailable(storeDir string) int64 {
    25  	var ba int64
    26  	if _, err := os.Stat(storeDir); os.IsNotExist(err) {
    27  		os.MkdirAll(storeDir, defaultDirPerms)
    28  	}
    29  	var fs syscall.Statfs_t
    30  	if err := syscall.Statfs(storeDir, &fs); err == nil {
    31  		// Estimate 75% of available storage.
    32  		ba = int64(uint64(fs.Bavail) * uint64(fs.Bsize) / 4 * 3)
    33  	} else {
    34  		// Used 1TB default as a guess if all else fails.
    35  		ba = JetStreamMaxStoreDefault
    36  	}
    37  	return ba
    38  }