source: src/linux/universal/linux-4.9/include/uapi/linux/fs.h @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 6 weeks ago

use new squashfs in all kernels

File size: 13.2 KB
Line 
1#ifndef _UAPI_LINUX_FS_H
2#define _UAPI_LINUX_FS_H
3
4/*
5 * This file has definitions for some important file table structures
6 * and constants and structures used by various generic file system
7 * ioctl's.  Please do not make any changes in this file before
8 * sending patches for review to linux-fsdevel@vger.kernel.org and
9 * linux-api@vger.kernel.org.
10 */
11
12#include <linux/limits.h>
13#include <linux/ioctl.h>
14#include <linux/types.h>
15
16/*
17 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
18 * the file limit at runtime and only root can increase the per-process
19 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
20 * upper limit on files-per-process.
21 *
22 * Some programs (notably those using select()) may have to be
23 * recompiled to take full advantage of the new limits.. 
24 */
25
26/* Fixed constants first: */
27#undef NR_OPEN
28#define INR_OPEN_CUR 1024       /* Initial setting for nfile rlimits */
29#define INR_OPEN_MAX 4096       /* Hard limit for nfile rlimits */
30
31#define BLOCK_SIZE_BITS 10
32#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
33
34#define SEEK_SET        0       /* seek relative to beginning of file */
35#define SEEK_CUR        1       /* seek relative to current file position */
36#define SEEK_END        2       /* seek relative to end of file */
37#define SEEK_DATA       3       /* seek to the next data */
38#define SEEK_HOLE       4       /* seek to the next hole */
39#define SEEK_MAX        SEEK_HOLE
40
41#define RENAME_NOREPLACE        (1 << 0)        /* Don't overwrite target */
42#define RENAME_EXCHANGE         (1 << 1)        /* Exchange source and dest */
43#define RENAME_WHITEOUT         (1 << 2)        /* Whiteout source */
44
45struct file_clone_range {
46        __s64 src_fd;
47        __u64 src_offset;
48        __u64 src_length;
49        __u64 dest_offset;
50};
51
52struct fstrim_range {
53        __u64 start;
54        __u64 len;
55        __u64 minlen;
56};
57
58/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
59#define FILE_DEDUPE_RANGE_SAME          0
60#define FILE_DEDUPE_RANGE_DIFFERS       1
61
62/* from struct btrfs_ioctl_file_extent_same_info */
63struct file_dedupe_range_info {
64        __s64 dest_fd;          /* in - destination file */
65        __u64 dest_offset;      /* in - start of extent in destination */
66        __u64 bytes_deduped;    /* out - total # of bytes we were able
67                                 * to dedupe from this file. */
68        /* status of this dedupe operation:
69         * < 0 for error
70         * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
71         * == FILE_DEDUPE_RANGE_DIFFERS if data differs
72         */
73        __s32 status;           /* out - see above description */
74        __u32 reserved;         /* must be zero */
75};
76
77/* from struct btrfs_ioctl_file_extent_same_args */
78struct file_dedupe_range {
79        __u64 src_offset;       /* in - start of extent in source */
80        __u64 src_length;       /* in - length of extent */
81        __u16 dest_count;       /* in - total elements in info array */
82        __u16 reserved1;        /* must be zero */
83        __u32 reserved2;        /* must be zero */
84        struct file_dedupe_range_info info[0];
85};
86
87/* And dynamically-tunable limits and defaults: */
88struct files_stat_struct {
89        unsigned long nr_files;         /* read only */
90        unsigned long nr_free_files;    /* read only */
91        unsigned long max_files;                /* tunable */
92};
93
94struct inodes_stat_t {
95        long nr_inodes;
96        long nr_unused;
97        long dummy[5];          /* padding for sysctl ABI compatibility */
98};
99
100
101#define NR_FILE  8192   /* this can well be larger on a larger system */
102
103
104/*
105 * These are the fs-independent mount-flags: up to 32 flags are supported
106 */
107#define MS_RDONLY        1      /* Mount read-only */
108#define MS_NOSUID        2      /* Ignore suid and sgid bits */
109#define MS_NODEV         4      /* Disallow access to device special files */
110#define MS_NOEXEC        8      /* Disallow program execution */
111#define MS_SYNCHRONOUS  16      /* Writes are synced at once */
112#define MS_REMOUNT      32      /* Alter flags of a mounted FS */
113#define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
114#define MS_DIRSYNC      128     /* Directory modifications are synchronous */
115#define MS_NOATIME      1024    /* Do not update access times. */
116#define MS_NODIRATIME   2048    /* Do not update directory access times */
117#define MS_BIND         4096
118#define MS_MOVE         8192
119#define MS_REC          16384
120#define MS_VERBOSE      32768   /* War is peace. Verbosity is silence.
121                                   MS_VERBOSE is deprecated. */
122#define MS_SILENT       32768
123#define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
124#define MS_UNBINDABLE   (1<<17) /* change to unbindable */
125#define MS_PRIVATE      (1<<18) /* change to private */
126#define MS_SLAVE        (1<<19) /* change to slave */
127#define MS_SHARED       (1<<20) /* change to shared */
128#define MS_RELATIME     (1<<21) /* Update atime relative to mtime/ctime. */
129#define MS_KERNMOUNT    (1<<22) /* this is a kern_mount call */
130#define MS_I_VERSION    (1<<23) /* Update inode I_version field */
131#define MS_STRICTATIME  (1<<24) /* Always perform atime updates */
132#define MS_LAZYTIME     (1<<25) /* Update the on-disk [acm]times lazily */
133
134/* These sb flags are internal to the kernel */
135#define MS_SUBMOUNT     (1<<26)
136#define MS_NOREMOTELOCK (1<<27)
137#define MS_NOSEC        (1<<28)
138#define MS_BORN         (1<<29)
139#define MS_ACTIVE       (1<<30)
140#define MS_NOUSER       (1<<31)
141
142/*
143 * Superblock flags that can be altered by MS_REMOUNT
144 */
145#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
146                         MS_LAZYTIME)
147
148/*
149 * Old magic mount flag and mask
150 */
151#define MS_MGC_VAL 0xC0ED0000
152#define MS_MGC_MSK 0xffff0000
153
154/*
155 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
156 */
157struct fsxattr {
158        __u32           fsx_xflags;     /* xflags field value (get/set) */
159        __u32           fsx_extsize;    /* extsize field value (get/set)*/
160        __u32           fsx_nextents;   /* nextents field value (get)   */
161        __u32           fsx_projid;     /* project identifier (get/set) */
162        __u32           fsx_cowextsize; /* CoW extsize field value (get/set)*/
163        unsigned char   fsx_pad[8];
164};
165
166/*
167 * Flags for the fsx_xflags field
168 */
169#define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
170#define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
171#define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
172#define FS_XFLAG_APPEND         0x00000010      /* all writes append */
173#define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
174#define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
175#define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
176#define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
177#define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
178#define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
179#define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
180#define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
181#define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
182#define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
183#define FS_XFLAG_DAX            0x00008000      /* use DAX for IO */
184#define FS_XFLAG_COWEXTSIZE     0x00010000      /* CoW extent size allocator hint */
185#define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this   */
186
187/* the read-only stuff doesn't really belong here, but any other place is
188   probably as bad and I don't want to create yet another include file. */
189
190#define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
191#define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
192#define BLKRRPART  _IO(0x12,95) /* re-read partition table */
193#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
194#define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
195#define BLKRASET   _IO(0x12,98) /* set read ahead for block device */
196#define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
197#define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
198#define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
199#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
200#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
201#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
202#if 0
203#define BLKPG      _IO(0x12,105)/* See blkpg.h */
204
205/* Some people are morons.  Do not use sizeof! */
206
207#define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
208#define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
209/* This was here just to show that the number is taken -
210   probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
211#endif
212/* A jump here: 108-111 have been used for various private purposes. */
213#define BLKBSZGET  _IOR(0x12,112,size_t)
214#define BLKBSZSET  _IOW(0x12,113,size_t)
215#define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
216#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
217#define BLKTRACESTART _IO(0x12,116)
218#define BLKTRACESTOP _IO(0x12,117)
219#define BLKTRACETEARDOWN _IO(0x12,118)
220#define BLKDISCARD _IO(0x12,119)
221#define BLKIOMIN _IO(0x12,120)
222#define BLKIOOPT _IO(0x12,121)
223#define BLKALIGNOFF _IO(0x12,122)
224#define BLKPBSZGET _IO(0x12,123)
225#define BLKDISCARDZEROES _IO(0x12,124)
226#define BLKSECDISCARD _IO(0x12,125)
227#define BLKROTATIONAL _IO(0x12,126)
228#define BLKZEROOUT _IO(0x12,127)
229
230#define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
231#define FIBMAP     _IO(0x00,1)  /* bmap access */
232#define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
233#define FIFREEZE        _IOWR('X', 119, int)    /* Freeze */
234#define FITHAW          _IOWR('X', 120, int)    /* Thaw */
235#define FITRIM          _IOWR('X', 121, struct fstrim_range)    /* Trim */
236#define FICLONE         _IOW(0x94, 9, int)
237#define FICLONERANGE    _IOW(0x94, 13, struct file_clone_range)
238#define FIDEDUPERANGE   _IOWR(0x94, 54, struct file_dedupe_range)
239
240#define FS_IOC_GETFLAGS                 _IOR('f', 1, long)
241#define FS_IOC_SETFLAGS                 _IOW('f', 2, long)
242#define FS_IOC_GETVERSION               _IOR('v', 1, long)
243#define FS_IOC_SETVERSION               _IOW('v', 2, long)
244#define FS_IOC_FIEMAP                   _IOWR('f', 11, struct fiemap)
245#define FS_IOC32_GETFLAGS               _IOR('f', 1, int)
246#define FS_IOC32_SETFLAGS               _IOW('f', 2, int)
247#define FS_IOC32_GETVERSION             _IOR('v', 1, int)
248#define FS_IOC32_SETVERSION             _IOW('v', 2, int)
249#define FS_IOC_FSGETXATTR               _IOR ('X', 31, struct fsxattr)
250#define FS_IOC_FSSETXATTR               _IOW ('X', 32, struct fsxattr)
251
252/*
253 * File system encryption support
254 */
255/* Policy provided via an ioctl on the topmost directory */
256#define FS_KEY_DESCRIPTOR_SIZE  8
257
258struct fscrypt_policy {
259        __u8 version;
260        __u8 contents_encryption_mode;
261        __u8 filenames_encryption_mode;
262        __u8 flags;
263        __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
264} __packed;
265
266#define FS_IOC_SET_ENCRYPTION_POLICY    _IOR('f', 19, struct fscrypt_policy)
267#define FS_IOC_GET_ENCRYPTION_PWSALT    _IOW('f', 20, __u8[16])
268#define FS_IOC_GET_ENCRYPTION_POLICY    _IOW('f', 21, struct fscrypt_policy)
269
270/*
271 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
272 *
273 * Note: for historical reasons, these flags were originally used and
274 * defined for use by ext2/ext3, and then other file systems started
275 * using these flags so they wouldn't need to write their own version
276 * of chattr/lsattr (which was shipped as part of e2fsprogs).  You
277 * should think twice before trying to use these flags in new
278 * contexts, or trying to assign these flags, since they are used both
279 * as the UAPI and the on-disk encoding for ext2/3/4.  Also, we are
280 * almost out of 32-bit flags.  :-)
281 *
282 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from
283 * XFS to the generic FS level interface.  This uses a structure that
284 * has padding and hence has more room to grow, so it may be more
285 * appropriate for many new use cases.
286 *
287 * Please do not change these flags or interfaces before checking with
288 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.
289 */
290#define FS_SECRM_FL                     0x00000001 /* Secure deletion */
291#define FS_UNRM_FL                      0x00000002 /* Undelete */
292#define FS_COMPR_FL                     0x00000004 /* Compress file */
293#define FS_SYNC_FL                      0x00000008 /* Synchronous updates */
294#define FS_IMMUTABLE_FL                 0x00000010 /* Immutable file */
295#define FS_APPEND_FL                    0x00000020 /* writes to file may only append */
296#define FS_NODUMP_FL                    0x00000040 /* do not dump file */
297#define FS_NOATIME_FL                   0x00000080 /* do not update atime */
298/* Reserved for compression usage... */
299#define FS_DIRTY_FL                     0x00000100
300#define FS_COMPRBLK_FL                  0x00000200 /* One or more compressed clusters */
301#define FS_NOCOMP_FL                    0x00000400 /* Don't compress */
302/* End compression flags --- maybe not all used */
303#define FS_ENCRYPT_FL                   0x00000800 /* Encrypted file */
304#define FS_BTREE_FL                     0x00001000 /* btree format dir */
305#define FS_INDEX_FL                     0x00001000 /* hash-indexed directory */
306#define FS_IMAGIC_FL                    0x00002000 /* AFS directory */
307#define FS_JOURNAL_DATA_FL              0x00004000 /* Reserved for ext3 */
308#define FS_NOTAIL_FL                    0x00008000 /* file tail should not be merged */
309#define FS_DIRSYNC_FL                   0x00010000 /* dirsync behaviour (directories only) */
310#define FS_TOPDIR_FL                    0x00020000 /* Top of directory hierarchies*/
311#define FS_HUGE_FILE_FL                 0x00040000 /* Reserved for ext4 */
312#define FS_EXTENT_FL                    0x00080000 /* Extents */
313#define FS_EA_INODE_FL                  0x00200000 /* Inode used for large EA */
314#define FS_EOFBLOCKS_FL                 0x00400000 /* Reserved for ext4 */
315#define FS_NOCOW_FL                     0x00800000 /* Do not cow file */
316#define FS_INLINE_DATA_FL               0x10000000 /* Reserved for ext4 */
317#define FS_PROJINHERIT_FL               0x20000000 /* Create with parents projid */
318#define FS_RESERVED_FL                  0x80000000 /* reserved for ext2 lib */
319
320#define FS_FL_USER_VISIBLE              0x0003DFFF /* User visible flags */
321#define FS_FL_USER_MODIFIABLE           0x000380FF /* User modifiable flags */
322
323
324#define SYNC_FILE_RANGE_WAIT_BEFORE     1
325#define SYNC_FILE_RANGE_WRITE           2
326#define SYNC_FILE_RANGE_WAIT_AFTER      4
327
328/* flags for preadv2/pwritev2: */
329#define RWF_HIPRI                       0x00000001 /* high priority request, poll if possible */
330#define RWF_DSYNC                       0x00000002 /* per-IO O_DSYNC */
331#define RWF_SYNC                        0x00000004 /* per-IO O_SYNC */
332
333#endif /* _UAPI_LINUX_FS_H */
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