inet.af/netstack@v0.0.0-20220214151720-7585b01ddccf/abi/linux/fs.go (about) 1 // Copyright 2018 The gVisor Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package linux 16 17 // Filesystem types used in statfs(2). 18 // 19 // See linux/magic.h. 20 const ( 21 ANON_INODE_FS_MAGIC = 0x09041934 22 CGROUP_SUPER_MAGIC = 0x27e0eb 23 DEVPTS_SUPER_MAGIC = 0x00001cd1 24 EXT_SUPER_MAGIC = 0xef53 25 FUSE_SUPER_MAGIC = 0x65735546 26 MQUEUE_MAGIC = 0x19800202 27 OVERLAYFS_SUPER_MAGIC = 0x794c7630 28 PIPEFS_MAGIC = 0x50495045 29 PROC_SUPER_MAGIC = 0x9fa0 30 RAMFS_MAGIC = 0x09041934 31 SOCKFS_MAGIC = 0x534F434B 32 SYSFS_MAGIC = 0x62656572 33 TMPFS_MAGIC = 0x01021994 34 V9FS_MAGIC = 0x01021997 35 ) 36 37 // Filesystem path limits, from uapi/linux/limits.h. 38 const ( 39 NAME_MAX = 255 40 PATH_MAX = 4096 41 ) 42 43 // Statfs is struct statfs, from uapi/asm-generic/statfs.h. 44 // 45 // +marshal 46 type Statfs struct { 47 // Type is one of the filesystem magic values, defined above. 48 Type uint64 49 50 // BlockSize is the optimal transfer block size in bytes. 51 BlockSize int64 52 53 // Blocks is the maximum number of data blocks the filesystem may store, in 54 // units of BlockSize. 55 Blocks uint64 56 57 // BlocksFree is the number of free data blocks, in units of BlockSize. 58 BlocksFree uint64 59 60 // BlocksAvailable is the number of data blocks free for use by 61 // unprivileged users, in units of BlockSize. 62 BlocksAvailable uint64 63 64 // Files is the number of used file nodes on the filesystem. 65 Files uint64 66 67 // FileFress is the number of free file nodes on the filesystem. 68 FilesFree uint64 69 70 // FSID is the filesystem ID. 71 FSID [2]int32 72 73 // NameLength is the maximum file name length. 74 NameLength uint64 75 76 // FragmentSize is equivalent to BlockSize. 77 FragmentSize int64 78 79 // Flags is the set of filesystem mount flags. 80 Flags uint64 81 82 // Spare is unused. 83 Spare [4]uint64 84 } 85 86 // Whence argument to lseek(2), from include/uapi/linux/fs.h. 87 const ( 88 SEEK_SET = 0 89 SEEK_CUR = 1 90 SEEK_END = 2 91 SEEK_DATA = 3 92 SEEK_HOLE = 4 93 ) 94 95 // Sync_file_range flags, from include/uapi/linux/fs.h 96 const ( 97 SYNC_FILE_RANGE_WAIT_BEFORE = 1 98 SYNC_FILE_RANGE_WRITE = 2 99 SYNC_FILE_RANGE_WAIT_AFTER = 4 100 ) 101 102 // Flag argument to renameat2(2), from include/uapi/linux/fs.h. 103 const ( 104 RENAME_NOREPLACE = (1 << 0) // Don't overwrite target. 105 RENAME_EXCHANGE = (1 << 1) // Exchange src and dst. 106 RENAME_WHITEOUT = (1 << 2) // Whiteout src. 107 )