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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package linux
// Filesystem types used in statfs(2).
//
// See linux/magic.h.
const (
ANON_INODE_FS_MAGIC = 0x09041934
DEVPTS_SUPER_MAGIC = 0x00001cd1
EXT_SUPER_MAGIC = 0xef53
OVERLAYFS_SUPER_MAGIC = 0x794c7630
PIPEFS_MAGIC = 0x50495045
PROC_SUPER_MAGIC = 0x9fa0
RAMFS_MAGIC = 0x09041934
SOCKFS_MAGIC = 0x534F434B
SYSFS_MAGIC = 0x62656572
TMPFS_MAGIC = 0x01021994
V9FS_MAGIC = 0x01021997
FUSE_SUPER_MAGIC = 0x65735546
)
// Filesystem path limits, from uapi/linux/limits.h.
const (
NAME_MAX = 255
PATH_MAX = 4096
)
// Statfs is struct statfs, from uapi/asm-generic/statfs.h.
//
// +marshal
type Statfs struct {
// Type is one of the filesystem magic values, defined above.
Type uint64
// BlockSize is the optimal transfer block size in bytes.
BlockSize int64
// Blocks is the maximum number of data blocks the filesystem may store, in
// units of BlockSize.
Blocks uint64
// BlocksFree is the number of free data blocks, in units of BlockSize.
BlocksFree uint64
// BlocksAvailable is the number of data blocks free for use by
// unprivileged users, in units of BlockSize.
BlocksAvailable uint64
// Files is the number of used file nodes on the filesystem.
Files uint64
// FileFress is the number of free file nodes on the filesystem.
FilesFree uint64
// FSID is the filesystem ID.
FSID [2]int32
// NameLength is the maximum file name length.
NameLength uint64
// FragmentSize is equivalent to BlockSize.
FragmentSize int64
// Flags is the set of filesystem mount flags.
Flags uint64
// Spare is unused.
Spare [4]uint64
}
// Whence argument to lseek(2), from include/uapi/linux/fs.h.
const (
SEEK_SET = 0
SEEK_CUR = 1
SEEK_END = 2
SEEK_DATA = 3
SEEK_HOLE = 4
)
// Sync_file_range flags, from include/uapi/linux/fs.h
const (
SYNC_FILE_RANGE_WAIT_BEFORE = 1
SYNC_FILE_RANGE_WRITE = 2
SYNC_FILE_RANGE_WAIT_AFTER = 4
)
// Flag argument to renameat2(2), from include/uapi/linux/fs.h.
const (
RENAME_NOREPLACE = (1 << 0) // Don't overwrite target.
RENAME_EXCHANGE = (1 << 1) // Exchange src and dst.
RENAME_WHITEOUT = (1 << 2) // Whiteout src.
)
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