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- // Copyright 2020 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
-
- //go:build zos && s390x
- // +build zos,s390x
-
- package unix
-
- import (
- "unsafe"
- )
-
- // This file simulates fstatfs on z/OS using fstatvfs and w_getmntent.
-
- func Fstatfs(fd int, stat *Statfs_t) (err error) {
- var stat_v Statvfs_t
- err = Fstatvfs(fd, &stat_v)
- if err == nil {
- // populate stat
- stat.Type = 0
- stat.Bsize = stat_v.Bsize
- stat.Blocks = stat_v.Blocks
- stat.Bfree = stat_v.Bfree
- stat.Bavail = stat_v.Bavail
- stat.Files = stat_v.Files
- stat.Ffree = stat_v.Ffree
- stat.Fsid = stat_v.Fsid
- stat.Namelen = stat_v.Namemax
- stat.Frsize = stat_v.Frsize
- stat.Flags = stat_v.Flag
- for passn := 0; passn < 5; passn++ {
- switch passn {
- case 0:
- err = tryGetmntent64(stat)
- break
- case 1:
- err = tryGetmntent128(stat)
- break
- case 2:
- err = tryGetmntent256(stat)
- break
- case 3:
- err = tryGetmntent512(stat)
- break
- case 4:
- err = tryGetmntent1024(stat)
- break
- default:
- break
- }
- //proceed to return if: err is nil (found), err is nonnil but not ERANGE (another error occurred)
- if err == nil || err != nil && err != ERANGE {
- break
- }
- }
- }
- return err
- }
-
- func tryGetmntent64(stat *Statfs_t) (err error) {
- var mnt_ent_buffer struct {
- header W_Mnth
- filesys_info [64]W_Mntent
- }
- var buffer_size int = int(unsafe.Sizeof(mnt_ent_buffer))
- fs_count, err := W_Getmntent((*byte)(unsafe.Pointer(&mnt_ent_buffer)), buffer_size)
- if err != nil {
- return err
- }
- err = ERANGE //return ERANGE if no match is found in this batch
- for i := 0; i < fs_count; i++ {
- if stat.Fsid == uint64(mnt_ent_buffer.filesys_info[i].Dev) {
- stat.Type = uint32(mnt_ent_buffer.filesys_info[i].Fstname[0])
- err = nil
- break
- }
- }
- return err
- }
-
- func tryGetmntent128(stat *Statfs_t) (err error) {
- var mnt_ent_buffer struct {
- header W_Mnth
- filesys_info [128]W_Mntent
- }
- var buffer_size int = int(unsafe.Sizeof(mnt_ent_buffer))
- fs_count, err := W_Getmntent((*byte)(unsafe.Pointer(&mnt_ent_buffer)), buffer_size)
- if err != nil {
- return err
- }
- err = ERANGE //return ERANGE if no match is found in this batch
- for i := 0; i < fs_count; i++ {
- if stat.Fsid == uint64(mnt_ent_buffer.filesys_info[i].Dev) {
- stat.Type = uint32(mnt_ent_buffer.filesys_info[i].Fstname[0])
- err = nil
- break
- }
- }
- return err
- }
-
- func tryGetmntent256(stat *Statfs_t) (err error) {
- var mnt_ent_buffer struct {
- header W_Mnth
- filesys_info [256]W_Mntent
- }
- var buffer_size int = int(unsafe.Sizeof(mnt_ent_buffer))
- fs_count, err := W_Getmntent((*byte)(unsafe.Pointer(&mnt_ent_buffer)), buffer_size)
- if err != nil {
- return err
- }
- err = ERANGE //return ERANGE if no match is found in this batch
- for i := 0; i < fs_count; i++ {
- if stat.Fsid == uint64(mnt_ent_buffer.filesys_info[i].Dev) {
- stat.Type = uint32(mnt_ent_buffer.filesys_info[i].Fstname[0])
- err = nil
- break
- }
- }
- return err
- }
-
- func tryGetmntent512(stat *Statfs_t) (err error) {
- var mnt_ent_buffer struct {
- header W_Mnth
- filesys_info [512]W_Mntent
- }
- var buffer_size int = int(unsafe.Sizeof(mnt_ent_buffer))
- fs_count, err := W_Getmntent((*byte)(unsafe.Pointer(&mnt_ent_buffer)), buffer_size)
- if err != nil {
- return err
- }
- err = ERANGE //return ERANGE if no match is found in this batch
- for i := 0; i < fs_count; i++ {
- if stat.Fsid == uint64(mnt_ent_buffer.filesys_info[i].Dev) {
- stat.Type = uint32(mnt_ent_buffer.filesys_info[i].Fstname[0])
- err = nil
- break
- }
- }
- return err
- }
-
- func tryGetmntent1024(stat *Statfs_t) (err error) {
- var mnt_ent_buffer struct {
- header W_Mnth
- filesys_info [1024]W_Mntent
- }
- var buffer_size int = int(unsafe.Sizeof(mnt_ent_buffer))
- fs_count, err := W_Getmntent((*byte)(unsafe.Pointer(&mnt_ent_buffer)), buffer_size)
- if err != nil {
- return err
- }
- err = ERANGE //return ERANGE if no match is found in this batch
- for i := 0; i < fs_count; i++ {
- if stat.Fsid == uint64(mnt_ent_buffer.filesys_info[i].Dev) {
- stat.Type = uint32(mnt_ent_buffer.filesys_info[i].Fstname[0])
- err = nil
- break
- }
- }
- return err
- }
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