#ifndef _UAPI_LINUX_FS_H#define _UAPI_LINUX_FS_H /* * 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. */ #include <linux/limits.h>#include <linux/ioctl.h>#include <linux/types.h> /* * 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  * recompiled to take full advantage of the new limits..   */ /* Fixed constants first: */#undef NR_OPEN#define INR_OPEN_CUR 1024	/* Initial setting for nfile rlimits */#define INR_OPEN_MAX 4096	/* Hard limit for nfile rlimits */ #define BLOCK_SIZE_BITS 10#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) #define SEEK_SET	0	/* seek relative to beginning of file */#define SEEK_CUR	1	/* seek relative to current file position */#define SEEK_END	2	/* seek relative to end of file */#define SEEK_DATA	3	/* seek to the next data */#define SEEK_HOLE	4	/* seek to the next hole */#define SEEK_MAX	SEEK_HOLE #define RENAME_NOREPLACE	(1 << 0)	/* Don't overwrite target */#define RENAME_EXCHANGE		(1 << 1)	/* Exchange source and dest */#define RENAME_WHITEOUT		(1 << 2)	/* Whiteout source */ struct file_clone_range {	__s64 src_fd;	__u64 src_offset;	__u64 src_length;	__u64 dest_offset;}; struct fstrim_range {	__u64 start;	__u64 len;	__u64 minlen;}; /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */#define FILE_DEDUPE_RANGE_SAME		0#define FILE_DEDUPE_RANGE_DIFFERS	1 /* from struct btrfs_ioctl_file_extent_same_info */struct file_dedupe_range_info {	__s64 dest_fd;		/* in - destination file */	__u64 dest_offset;	/* in - start of extent in destination */	__u64 bytes_deduped;	/* out - total # of bytes we were able				 * to dedupe from this file. */	/* status of this dedupe operation:	 * < 0 for error	 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds	 * == FILE_DEDUPE_RANGE_DIFFERS if data differs	 */	__s32 status;		/* out - see above description */	__u32 reserved;		/* must be zero */}; /* from struct btrfs_ioctl_file_extent_same_args */struct file_dedupe_range {	__u64 src_offset;	/* in - start of extent in source */	__u64 src_length;	/* in - length of extent */	__u16 dest_count;	/* in - total elements in info array */	__u16 reserved1;	/* must be zero */	__u32 reserved2;	/* must be zero */	struct file_dedupe_range_info info[0];}; /* And dynamically-tunable limits and defaults: */struct files_stat_struct {	unsigned long nr_files;		/* read only */	unsigned long nr_free_files;	/* read only */	unsigned long max_files;		/* tunable */}; struct inodes_stat_t {	long nr_inodes;	long nr_unused;	long dummy[5];		/* padding for sysctl ABI compatibility */};  #define NR_FILE  8192	/* this can well be larger on a larger system */  /* * These are the fs-independent mount-flags: up to 32 flags are supported */#define MS_RDONLY	 1	/* Mount read-only */#define MS_NOSUID	 2	/* Ignore suid and sgid bits */#define MS_NODEV	 4	/* Disallow access to device special files */#define MS_NOEXEC	 8	/* Disallow program execution */#define MS_SYNCHRONOUS	16	/* Writes are synced at once */#define MS_REMOUNT	32	/* Alter flags of a mounted FS */#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */#define MS_DIRSYNC	128	/* Directory modifications are synchronous */#define MS_NOATIME	1024	/* Do not update access times. */#define MS_NODIRATIME	2048	/* Do not update directory access times */#define MS_BIND		4096#define MS_MOVE		8192#define MS_REC		16384#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.				   MS_VERBOSE is deprecated. */#define MS_SILENT	32768#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */#define MS_PRIVATE	(1<<18)	/* change to private */#define MS_SLAVE	(1<<19)	/* change to slave */#define MS_SHARED	(1<<20)	/* change to shared */#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */#define MS_I_VERSION	(1<<23) /* Update inode I_version field */#define MS_STRICTATIME	(1<<24) /* Always perform atime updates */#define MS_LAZYTIME	(1<<25) /* Update the on-disk [acm]times lazily */ /* These sb flags are internal to the kernel */#define MS_NOSEC	(1<<28)#define MS_BORN		(1<<29)#define MS_ACTIVE	(1<<30)#define MS_NOUSER	(1<<31) /* * Superblock flags that can be altered by MS_REMOUNT */#define MS_RMT_MASK	(MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\			 MS_LAZYTIME) /* * Old magic mount flag and mask */#define MS_MGC_VAL 0xC0ED0000#define MS_MGC_MSK 0xffff0000 /* * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. */struct fsxattr {	__u32		fsx_xflags;	/* xflags field value (get/set) */	__u32		fsx_extsize;	/* extsize field value (get/set)*/	__u32		fsx_nextents;	/* nextents field value (get)	*/	__u32		fsx_projid;	/* project identifier (get/set) */	unsigned char	fsx_pad[12];}; /* * Flags for the fsx_xflags field */#define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */#define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */#define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */#define FS_XFLAG_APPEND		0x00000010	/* all writes append */#define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */#define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */#define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */#define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */#define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */#define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */#define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */#define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */#define FS_XFLAG_NODEFRAG	0x00002000	/* do not defragment */#define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */#define FS_XFLAG_DAX		0x00008000	/* use DAX for IO */#define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/ /* 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. */ #define BLKROSET   _IO(0x12,93)	/* set device read-only (0 = read-write) */#define BLKROGET   _IO(0x12,94)	/* get read-only status (0 = read_write) */#define BLKRRPART  _IO(0x12,95)	/* re-read partition table */#define BLKGETSIZE _IO(0x12,96)	/* return device size /512 (long *arg) */#define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */#define BLKRASET   _IO(0x12,98)	/* set read ahead for block device */#define BLKRAGET   _IO(0x12,99)	/* get current read ahead setting */#define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */#define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */#if 0#define BLKPG      _IO(0x12,105)/* See blkpg.h */ /* Some people are morons.  Do not use sizeof! */ #define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */#define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set *//* This was here just to show that the number is taken -   probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */#endif/* A jump here: 108-111 have been used for various private purposes. */#define BLKBSZGET  _IOR(0x12,112,size_t)#define BLKBSZSET  _IOW(0x12,113,size_t)#define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)#define BLKTRACESTART _IO(0x12,116)#define BLKTRACESTOP _IO(0x12,117)#define BLKTRACETEARDOWN _IO(0x12,118)#define BLKDISCARD _IO(0x12,119)#define BLKIOMIN _IO(0x12,120)#define BLKIOOPT _IO(0x12,121)#define BLKALIGNOFF _IO(0x12,122)#define BLKPBSZGET _IO(0x12,123)#define BLKDISCARDZEROES _IO(0x12,124)#define BLKSECDISCARD _IO(0x12,125)#define BLKROTATIONAL _IO(0x12,126)#define BLKZEROOUT _IO(0x12,127)#define BLKDAXGET _IO(0x12,129) #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */#define FIBMAP	   _IO(0x00,1)	/* bmap access */#define FIGETBSZ   _IO(0x00,2)	/* get the block size used for bmap */#define FIFREEZE	_IOWR('X', 119, int)	/* Freeze */#define FITHAW		_IOWR('X', 120, int)	/* Thaw */#define FITRIM		_IOWR('X', 121, struct fstrim_range)	/* Trim */#define FICLONE		_IOW(0x94, 9, int)#define FICLONERANGE	_IOW(0x94, 13, struct file_clone_range)#define FIDEDUPERANGE	_IOWR(0x94, 54, struct file_dedupe_range) #define	FS_IOC_GETFLAGS			_IOR('f', 1, long)#define	FS_IOC_SETFLAGS			_IOW('f', 2, long)#define	FS_IOC_GETVERSION		_IOR('v', 1, long)#define	FS_IOC_SETVERSION		_IOW('v', 2, long)#define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)#define FS_IOC32_GETFLAGS		_IOR('f', 1, int)#define FS_IOC32_SETFLAGS		_IOW('f', 2, int)#define FS_IOC32_GETVERSION		_IOR('v', 1, int)#define FS_IOC32_SETVERSION		_IOW('v', 2, int)#define FS_IOC_FSGETXATTR		_IOR ('X', 31, struct fsxattr)#define FS_IOC_FSSETXATTR		_IOW ('X', 32, struct fsxattr) /* * 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. */#define	FS_SECRM_FL			0x00000001 /* Secure deletion */#define	FS_UNRM_FL			0x00000002 /* Undelete */#define	FS_COMPR_FL			0x00000004 /* Compress file */#define FS_SYNC_FL			0x00000008 /* Synchronous updates */#define FS_IMMUTABLE_FL			0x00000010 /* Immutable file */#define FS_APPEND_FL			0x00000020 /* writes to file may only append */#define FS_NODUMP_FL			0x00000040 /* do not dump file */#define FS_NOATIME_FL			0x00000080 /* do not update atime *//* Reserved for compression usage... */#define FS_DIRTY_FL			0x00000100#define FS_COMPRBLK_FL			0x00000200 /* One or more compressed clusters */#define FS_NOCOMP_FL			0x00000400 /* Don't compress *//* End compression flags --- maybe not all used */#define FS_ENCRYPT_FL			0x00000800 /* Encrypted file */#define FS_BTREE_FL			0x00001000 /* btree format dir */#define FS_INDEX_FL			0x00001000 /* hash-indexed directory */#define FS_IMAGIC_FL			0x00002000 /* AFS directory */#define FS_JOURNAL_DATA_FL		0x00004000 /* Reserved for ext3 */#define FS_NOTAIL_FL			0x00008000 /* file tail should not be merged */#define FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */#define FS_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/#define FS_HUGE_FILE_FL			0x00040000 /* Reserved for ext4 */#define FS_EXTENT_FL			0x00080000 /* Extents */#define FS_EA_INODE_FL			0x00200000 /* Inode used for large EA */#define FS_EOFBLOCKS_FL			0x00400000 /* Reserved for ext4 */#define FS_NOCOW_FL			0x00800000 /* Do not cow file */#define FS_INLINE_DATA_FL		0x10000000 /* Reserved for ext4 */#define FS_PROJINHERIT_FL		0x20000000 /* Create with parents projid */#define FS_RESERVED_FL			0x80000000 /* reserved for ext2 lib */ #define FS_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */#define FS_FL_USER_MODIFIABLE		0x000380FF /* User modifiable flags */  #define SYNC_FILE_RANGE_WAIT_BEFORE	1#define SYNC_FILE_RANGE_WRITE		2#define SYNC_FILE_RANGE_WAIT_AFTER	4 #endif /* _UAPI_LINUX_FS_H */