Release 4.7 include/uapi/linux/fs.h
#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 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)
/*
* File system encryption support
*/
/* Policy provided via an ioctl on the topmost directory */
#define FS_KEY_DESCRIPTOR_SIZE 8
struct fscrypt_policy {
__u8 version;
__u8 contents_encryption_mode;
__u8 filenames_encryption_mode;
__u8 flags;
__u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
}
__packed;
#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)
#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)
/*
* 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
/* flags for preadv2/pwritev2: */
#define RWF_HIPRI 0x00000001
/* high priority request, poll if possible */
#define RWF_DSYNC 0x00000002
/* per-IO O_DSYNC */
#define RWF_SYNC 0x00000004
/* per-IO O_SYNC */
#endif /* _UAPI_LINUX_FS_H */
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