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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"os"
"syscall"
"unsafe"
)
const (
// from /usr/include/linux/fs.h
FS_SECRM_FL = 0x00000001 /* Secure deletion */
FS_UNRM_FL = 0x00000002 /* Undelete */
FS_COMPR_FL = 0x00000004 /* Compress file */
FS_SYNC_FL = 0x00000008 /* Synchronous updates */
FS_IMMUTABLE_FL = 0x00000010 /* Immutable file */
FS_APPEND_FL = 0x00000020 /* writes to file may only append */
FS_NODUMP_FL = 0x00000040 /* do not dump file */
FS_NOATIME_FL = 0x00000080 /* do not update atime */
FS_DIRTY_FL = 0x00000100
FS_COMPRBLK_FL = 0x00000200 /* One or more compressed clusters */
FS_NOCOMP_FL = 0x00000400 /* Don't compress */
FS_ECOMPR_FL = 0x00000800 /* Compression error */
FS_BTREE_FL = 0x00001000 /* btree format dir */
FS_INDEX_FL = 0x00001000 /* hash-indexed directory */
FS_IMAGIC_FL = 0x00002000 /* AFS directory */
FS_JOURNAL_DATA_FL = 0x00004000 /* Reserved for ext3 */
FS_NOTAIL_FL = 0x00008000 /* file tail should not be merged */
FS_DIRSYNC_FL = 0x00010000 /* dirsync behaviour (directories only) */
FS_TOPDIR_FL = 0x00020000 /* Top of directory hierarchies*/
FS_EXTENT_FL = 0x00080000 /* Extents */
FS_DIRECTIO_FL = 0x00100000 /* Use direct i/o */
FS_NOCOW_FL = 0x00800000 /* Do not cow file */
FS_PROJINHERIT_FL = 0x20000000 /* Create with parents projid */
FS_RESERVED_FL = 0x80000000 /* reserved for ext2 lib */
)
func ioctl(f *os.File, request uintptr, attrp *int32) error {
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), request, uintptr(unsafe.Pointer(attrp)))
if errno != 0 {
return os.NewSyscallError("ioctl", errno)
}
return nil
}
// GetAttr retrieves the attributes of a file on a linux filesystem
func GetAttr(f *os.File) (int32, error) {
attr := int32(-1)
err := ioctl(f, _FS_IOC_GETFLAGS, &attr)
return attr, err
}
// SetAttr sets the attributes of a file on a linux filesystem to the given value
func SetAttr(f *os.File, attr int32) error {
return ioctl(f, _FS_IOC_SETFLAGS, &attr)
}
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