# Bucket Versioning Design Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/)

## Description of `xl.meta`

`xl.meta` is a new self describing backend format used by MinIO to support AWS S3 compatible versioning.
This file is the source of truth for each `version` at rest. `xl.meta` is a msgpack file serialized from a

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec       int64
	Usec      int32
	Pad_cgo_0 [4]byte
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int64
	Ixrss    int64
	Idrss    int64
	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64

// license that can be found in the LICENSE file.

//go:build 386 || amd64

package cpu

const CacheLinePadSize = 64

// cpuid is implemented in cpu_x86.s.
func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)

// xgetbv with ecx = 0 is implemented in cpu_x86.s.
func xgetbv() (eax, edx uint32)

// getGOAMD64level is implemented in cpu_x86.s. Returns number in [1,4].

	_C_long_long int64
)

type Timespec struct {
	Sec  int64
	Nsec int32
}

type Timeval struct {
	Sec  int64
	Usec int32
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int32
	Ixrss    int32
	Idrss    int32
	Isrss    int32
	Minflt   int32
	Majflt   int32
	Nswap    int32
	Inblock  int32
	Oublock  int32
	Msgsnd   int32
	Msgrcv   int32
	Nsignals int32

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec       int64
	Usec      int32
	Pad_cgo_0 [4]byte
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int64
	Ixrss    int64
	Idrss    int64
	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64

     * String literals include surrounding quotes and have special symbols escaped.
     * The returned string can be used to generate call to a method that accepts varargs.
     *
     * @param cmd the command line elements to be converted
     * @return a comma-separated list of string literals
     */
    static String cmdToVarargLiterals(List<String> cmd) {

	_C_long_long int64
)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int64
	Ixrss    int64
	Idrss    int64
	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64

type Timeval struct {
	Sec       int64
	Usec      int32
	Pad_cgo_0 [4]byte
}

type Timeval32 struct {
	Sec  int32
	Usec int32
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int64
	Ixrss    int64
	Idrss    int64
	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64

type Tms struct {
	Utime  int64
	Stime  int64
	Cutime int64
	Cstime int64
}

type Utimbuf struct {
	Actime  int64
	Modtime int64
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int64
	Ixrss    int64
	Idrss    int64
	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64

	Nsec      int32
	Pad_cgo_0 [4]byte
}

type Timeval struct {
	Sec       int64
	Usec      int32
	Pad_cgo_0 [4]byte
}

type Rusage struct {
	Utime    Timeval
	Stime    Timeval
	Maxrss   int32
	Ixrss    int32
	Idrss    int32
	Isrss    int32
	Minflt   int32
	Majflt   int32
	Nswap    int32
	Inblock  int32
	Oublock  int32
	Msgsnd   int32
	Msgrcv   int32
	Nsignals int32