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/// This file has definitions for some important file table structures /// and constants and structures used by various generic file system /// ioctl's. Please do not make any changes in this file before /// sending patches for review to linux-fsdevel@vger.kernel.org and /// linux-api@vger.kernel.org. /// Use of MS_* flags within the kernel is restricted to core mount(2) code. /// It's silly to have NR_OPEN bigger than NR_FILE, but you can change /// the file limit at runtime and only root can increase the per-process /// nr_file rlimit, so it's safe to set up a ridiculously high absolute /// upper limit on files-per-process. /// /// Some programs (notably those using select()) may have to be /// ecompiled to take full advantage of the new limits.. /// Fixed constants first: /// Initial setting for nfile rlimits pub const INR_OPEN_CUR: i32 = 1024; /// Hard limit for nfile rlimits pub const INR_OPEN_MAX: i32 = 4096; pub const BLOCK_SIZE_BITS: i32 = 10; pub const BLOCK_SIZE: i32 = (1 << BLOCK_SIZE_BITS); /// seek relative to beginning of file pub const SEEK_SET: i32 = 0; /// seek relative to current file position pub const SEEK_CUR: i32 = 1; /// seek relative to end of file pub const SEEK_END: i32 = 2; /// seek to the next data pub const SEEK_DATA: i32 = 3; /// seek to the next hole pub const SEEK_HOLE: i32 = 4; pub const SEEK_MAX: i32 = SEEK_HOLE; /// Don't overwrite target pub const RENAME_NOREPLACE: i32 = (1 << 0); /// Exchange source and dest pub const RENAME_EXCHANGE: i32 = (1 << 1); /// Whiteout source pub const RENAME_WHITEOUT: i32 = (1 << 2); #[repr(C)] pub struct file_clone_range_t { pub src_fd: i64, pub src_offset: u64, pub src_length: u64, pub dest_offset: u64, } #[repr(C)] pub struct fstrim_range_t { pub start: u64, pub len: u64, pub minlen: u64, } /// extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions pub const FILE_DEDUPE_RANGE_SAME: i32 = 0; pub const FILE_DEDUPE_RANGE_DIFFERS: i32 = 1; /// from struct btrfs_ioctl_file_extent_same_info #[repr(C)] pub struct file_dedupe_range_info_t { /// in - destination file pub dest_fd: i64, /// in - start of extent in destination pub dest_offset: u64, /// out - total # of bytes we were able to dedupe from this file. pub bytes_deduped: u64, /// status of this dedupe operation: /// < 0 for error /// == FILE_DEDUPE_RANGE_SAME if dedupe succeeds /// == FILE_DEDUPE_RANGE_DIFFERS if data differs /// out - see above description pub status: i32, /// must be zero pub reserved: u32, } /// from struct btrfs_ioctl_file_extent_same_args #[repr(C)] pub struct file_dedupe_range_t { /// in - start of extent in source pub src_offset: u64, /// in - length of extent pub src_length: u64, /// in - total elements in info array pub dest_count: u16, /// must be zero pub reserved1: u16, /// must be zero pub reserved2: u32, pub info: *mut file_dedupe_range_info_t, } /// And dynamically-tunable limits and defaults: #[repr(C)] pub struct files_stat_struct_t { /// read only pub nr_files: usize, /// read only pub nr_free_files: usize, /// tunable pub max_files: usize, } #[repr(C)] pub struct inodes_stat_t { pub nr_inodes: isize, pub nr_unused: isize, /// padding for sysctl ABI compatibility dummy: [isize; 5], } pub const NR_FILE: i32 = 8192; /* this can well be larger on a larger system */ /// Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. #[repr(C)] pub struct fsxattr_t { /// xflags field value (get/set) pub fsx_xflags: u32, /// extsize field value (get/set) pub fsx_extsize: u32, /// nextents field value (get) pub fsx_nextents: u32, /// project identifier (get/set) pub fsx_projid: u32, /// CoW extsize field value (get/set) pub fsx_cowextsize: u32, fsx_pad: [u8; 8], } /// Flags for the fsx_xflags field /// data in realtime volume pub const FS_XFLAG_REALTIME: i32 = 0x00000001; /// preallocated file extents pub const FS_XFLAG_PREALLOC: i32 = 0x00000002; /// file cannot be modified pub const FS_XFLAG_IMMUTABLE: i32 = 0x00000008; /// all writes append pub const FS_XFLAG_APPEND: i32 = 0x00000010; /// all writes synchronous pub const FS_XFLAG_SYNC: i32 = 0x00000020; /// do not update access time pub const FS_XFLAG_NOATIME: i32 = 0x00000040; /// do not include in backups pub const FS_XFLAG_NODUMP: i32 = 0x00000080; /// create with rt bit set pub const FS_XFLAG_RTINHERIT: i32 = 0x00000100; /// create with parents projid pub const FS_XFLAG_PROJINHERIT: i32 = 0x00000200; /// disallow symlink creation pub const FS_XFLAG_NOSYMLINKS: i32 = 0x00000400; /// extent size allocator hint pub const FS_XFLAG_EXTSIZE: i32 = 0x00000800; /// inherit inode extent size pub const FS_XFLAG_EXTSZINHERIT: i32 = 0x00001000; /// do not defragment pub const FS_XFLAG_NODEFRAG: i32 = 0x00002000; /// use filestream allocator pub const FS_XFLAG_FILESTREAM: i32 = 0x00004000; /// use DAX for IO pub const FS_XFLAG_DAX: i32 = 0x00008000; /// CoW extent size allocator hint pub const FS_XFLAG_COWEXTSIZE: i32 = 0x00010000; /// no DIFLAG for this #[allow(overflowing_literals)] pub const FS_XFLAG_HASATTR: i32 = 0x80000000; /// the read-only stuff doesn't really belong here, but any other place is /// probably as bad and I don't want to create yet another include file. //pub const BLKROSET: i32 = _IO!(0x12,93) /* set device read-only (0 = read-write) */ //pub const BLKROGET: i32 = _IO!(0x12,94) /* get read-only status (0 = read_write) */ //pub const BLKRRPART: i32 = _IO!(0x12,95) /* re-read partition table */ //pub const BLKGETSIZE: i32 = _IO!(0x12,96) /* return device size /512 (long *arg) */ //pub const BLKFLSBUF: i32 = _IO!(0x12,97) /* flush buffer cache */ //pub const BLKRASET: i32 = _IO!(0x12,98) /* set read ahead for block device */ //pub const BLKRAGET: i32 = _IO!(0x12,99) /* get current read ahead setting */ //pub const BLKFRASET: i32 = _IO!(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ //pub const BLKFRAGET: i32 = _IO!(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ //pub const BLKSECTSET: i32 = _IO!(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ //pub const BLKSECTGET: i32 = _IO!(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ //pub const BLKSSZGET: i32 = _IO!(0x12,104)/* get block device sector size */ // A jump here: 108-111 have been used for various private purposes. //pub const BLKBSZGET: i32 = _IOR!(0x12,112,size_t) //pub const BLKBSZSET: i32 = _IOW!(0x12,113,size_t) //pub const BLKGETSIZE64: i32 = _IOR!(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ //pub const BLKTRACESETUP: i32 = _IOWR!(0x12,115,struct blk_user_trace_setup) //pub const BLKTRACESTART: i32 = _IO!(0x12,116) //pub const BLKTRACESTOP: i32 = _IO!(0x12,117) //pub const BLKTRACETEARDOWN: i32 = _IO!(0x12,118) //pub const BLKDISCARD: i32 = _IO!(0x12,119) //pub const BLKIOMIN: i32 = _IO!(0x12,120) //pub const BLKIOOPT: i32 = _IO!(0x12,121) //pub const BLKALIGNOFF: i32 = _IO!(0x12,122) //pub const BLKPBSZGET: i32 = _IO!(0x12,123) //pub const BLKDISCARDZEROES: i32 = _IO!(0x12,124) //pub const BLKSECDISCARD: i32 = _IO!(0x12,125) //pub const BLKROTATIONAL: i32 = _IO!(0x12,126) //pub const BLKZEROOUT: i32 = _IO!(0x12,127) // A jump here: 130-131 are reserved for zoned block devices // (see uapi/linux/blkzoned.h) //pub const BMAP_IOCTL: i32 = 1; /* obsolete - kept for compatibility */ //pub const FIBMAP: i32 = _IO!(0x00,1) /* bmap access */ //pub const FIGETBSZ: i32 = _IO!(0x00,2) /* get the block size used for bmap */ //pub const FIFREEZE: i32 = _IOWR!('X', 119, int) /* Freeze */ //pub const FITHAW: i32 = _IOWR!('X', 120, int) /* Thaw */ //pub const FITRIM: i32 = _IOWR!('X', 121, struct fstrim_range) /* Trim */ //pub const FICLONE: i32 = _IOW!(0x94, 9, int) //pub const FICLONERANGE: i32 = _IOW!(0x94, 13, struct file_clone_range) //pub const FIDEDUPERANGE: i32 = _IOWR!(0x94, 54, struct file_dedupe_range) /// Max chars for the interface; each fs may differ pub const FSLABEL_MAX: i32 = 256; //pub const FS_IOC_GETFLAGS: i32 = _IOR!('f', 1, long) //pub const FS_IOC_SETFLAGS: i32 = _IOW!('f', 2, long) //pub const FS_IOC_GETVERSION: i32 = _IOR!('v', 1, long) //pub const FS_IOC_SETVERSION: i32 = _IOW!('v', 2, long) //pub const FS_IOC_FIEMAP: i32 = _IOWR!('f', 11, struct fiemap) //pub const FS_IOC32_GETFLAGS: i32 = _IOR!('f', 1, int) //pub const FS_IOC32_SETFLAGS: i32 = _IOW!('f', 2, int) //pub const FS_IOC32_GETVERSION: i32 = _IOR!('v', 1, int) //pub const FS_IOC32_SETVERSION: i32 = _IOW!('v', 2, int) //pub const FS_IOC_FSGETXATTR: i32 = _IOR!('X', 31, struct fsxattr) //pub const FS_IOC_FSSETXATTR: i32 = _IOW!('X', 32, struct fsxattr) //pub const FS_IOC_GETFSLABEL: i32 = _IOR!(0x94, 49, char[FSLABEL_MAX]) //pub const FS_IOC_SETFSLABEL: i32 = _IOW!(0x94, 50, char[FSLABEL_MAX]) /// File system encryption support /// Policy provided via an ioctl on the topmost directory pub const FS_KEY_DESCRIPTOR_SIZE: i32 = 8; pub const FS_POLICY_FLAGS_PAD_4: i32 = 0x00; pub const FS_POLICY_FLAGS_PAD_8: i32 = 0x01; pub const FS_POLICY_FLAGS_PAD_16: i32 = 0x02; pub const FS_POLICY_FLAGS_PAD_32: i32 = 0x03; pub const FS_POLICY_FLAGS_PAD_MASK: i32 = 0x03; /// use master key directly pub const FS_POLICY_FLAGS_VALID: i32 = 0x07; /// Encryption algorithms pub const FS_ENCRYPTION_MODE_INVALID: i32 = 0; pub const FS_ENCRYPTION_MODE_AES_256_XTS: i32 = 1; pub const FS_ENCRYPTION_MODE_AES_256_GCM: i32 = 2; pub const FS_ENCRYPTION_MODE_AES_256_CBC: i32 = 3; pub const FS_ENCRYPTION_MODE_AES_256_CTS: i32 = 4; pub const FS_ENCRYPTION_MODE_AES_128_CBC: i32 = 5; pub const FS_ENCRYPTION_MODE_AES_128_CTS: i32 = 6; /// Removed, do not use. pub const FS_ENCRYPTION_MODE_SPECK128_256_XTS: i32 = 7; /// Removed, do not use. pub const FS_ENCRYPTION_MODE_SPECK128_256_CTS: i32 = 8; pub const FS_ENCRYPTION_MODE_ADIANTUM: i32 = 9; #[repr(C)] pub struct fscrypt_policy_t { pub version: u8, pub contents_encryption_mode: u8, pub filenames_encryption_mode: u8, pub flags: u8, pub master_key_descriptor: [u8; FS_KEY_DESCRIPTOR_SIZE as usize], } // TODO(Shaohua): //pub const FS_IOC_SET_ENCRYPTION_POLICY: i32 = _IOR;('f', 19, struct fscrypt_policy) //pub const FS_IOC_GET_ENCRYPTION_PWSALT: i32 = _IOW;('f', 20, __u8[16]) //pub const FS_IOC_GET_ENCRYPTION_POLICY: i32 = _IOW;('f', 21, struct fscrypt_policy) /// Parameters for passing an encryption key into the kernel keyring pub const FS_KEY_DESC_PREFIX: &'static str = "fscrypt:"; pub const FS_KEY_DESC_PREFIX_SIZE: i32 = 8; /// Structure that userspace passes to the kernel keyring pub const FS_MAX_KEY_SIZE: i32 = 64; #[repr(C)] pub struct fscrypt_key_t { pub mode: u32, pub raw: [u8; FS_MAX_KEY_SIZE as usize], pub size: u32, } /// Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) /// /// Note: for historical reasons, these flags were originally used and /// defined for use by ext2/ext3, and then other file systems started /// using these flags so they wouldn't need to write their own version /// of chattr/lsattr (which was shipped as part of e2fsprogs). You /// should think twice before trying to use these flags in new /// contexts, or trying to assign these flags, since they are used both /// as the UAPI and the on-disk encoding for ext2/3/4. Also, we are /// almost out of 32-bit flags. :-) /// /// We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from /// XFS to the generic FS level interface. This uses a structure that /// has padding and hence has more room to grow, so it may be more /// appropriate for many new use cases. /// /// Please do not change these flags or interfaces before checking with /// linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. /// Secure deletion pub const FS_SECRM_FL: i32 = 0x00000001; /// Undelete pub const FS_UNRM_FL: i32 = 0x00000002; /// Compress file pub const FS_COMPR_FL: i32 = 0x00000004; /// Synchronous updates pub const FS_SYNC_FL: i32 = 0x00000008; /// Immutable file pub const FS_IMMUTABLE_FL: i32 = 0x00000010; /// writes to file may only append pub const FS_APPEND_FL: i32 = 0x00000020; /// do not dump file pub const FS_NODUMP_FL: i32 = 0x00000040; /// do not update atime pub const FS_NOATIME_FL: i32 = 0x00000080; /// Reserved for compression usage... pub const FS_DIRTY_FL: i32 = 0x00000100; /// One or more compressed clusters pub const FS_COMPRBLK_FL: i32 = 0x00000200; /// Don't compress pub const FS_NOCOMP_FL: i32 = 0x00000400; /// End compression flags --- maybe not all used /// Encrypted file pub const FS_ENCRYPT_FL: i32 = 0x00000800; /// btree format dir pub const FS_BTREE_FL: i32 = 0x00001000; /// hash-indexed directory pub const FS_INDEX_FL: i32 = 0x00001000; /// AFS directory pub const FS_IMAGIC_FL: i32 = 0x00002000; /// Reserved for ext3 pub const FS_JOURNAL_DATA_FL: i32 = 0x00004000; /// file tail should not be merged pub const FS_NOTAIL_FL: i32 = 0x00008000; /// dirsync behaviour (directories only) pub const FS_DIRSYNC_FL: i32 = 0x00010000; /// Top of directory hierarchies pub const FS_TOPDIR_FL: i32 = 0x00020000; /// Reserved for ext4 pub const FS_HUGE_FILE_FL: i32 = 0x00040000; /// Extents pub const FS_EXTENT_FL: i32 = 0x00080000; /// Inode used for large EA pub const FS_EA_INODE_FL: i32 = 0x00200000; /// Reserved for ext4 pub const FS_EOFBLOCKS_FL: i32 = 0x00400000; /// Do not cow file pub const FS_NOCOW_FL: i32 = 0x00800000; /// Reserved for ext4 pub const FS_INLINE_DATA_FL: i32 = 0x10000000; /// Create with parents projid pub const FS_PROJINHERIT_FL: i32 = 0x20000000; /// reserved for ext2 lib #[allow(overflowing_literals)] pub const FS_RESERVED_FL: i32 = 0x80000000; /// User visible flags pub const FS_FL_USER_VISIBLE: i32 = 0x0003DFFF; /// User modifiable flags pub const FS_FL_USER_MODIFIABLE: i32 = 0x000380FF; pub const SYNC_FILE_RANGE_WAIT_BEFORE: i32 = 1; pub const SYNC_FILE_RANGE_WRITE: i32 = 2; pub const SYNC_FILE_RANGE_WAIT_AFTER: i32 = 4; /// Flags for preadv2/pwritev2: pub type rwf_t = i32; /// high priority request, poll if possible pub const RWF_HIPRI: rwf_t = 0x00000001; /// per-IO O_DSYNC pub const RWF_DSYNC: rwf_t = 0x00000002; /// per-IO O_SYNC pub const RWF_SYNC: rwf_t = 0x00000004; /// per-IO, return -EAGAIN if operation would block pub const RWF_NOWAIT: rwf_t = 0x00000008; /// per-IO O_APPEND pub const RWF_APPEND: rwf_t = 0x00000010; /// mask of flags supported by the kernel pub const RWF_SUPPORTED: rwf_t = (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT | RWF_APPEND);