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fs.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_FS_H #define _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> #include <linux/fscrypt.h> /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */ #include <linux/mount.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; }; /* * We include a length field because some filesystems (vfat) have an identifier * that we do want to expose as a UUID, but doesn't have the standard length. * * We use a fixed size buffer beacuse this interface will, by fiat, never * support "UUIDs" longer than 16 bytes; we don't want to force all downstream * users to have to deal with that. */ struct fsuuid2 { __u8 len; __u8 uuid[16]; }; struct fs_sysfs_path { __u8 len; __u8 name[128]; }; /* 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 */ /* * 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) */ __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ unsigned char fsx_pad[8]; }; /* * 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_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ #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 BLKGETDISKSEQ _IOR(0x12,128,__u64) /* * A jump here: 130-136 are reserved for zoned block devices * (see uapi/linux/blkzoned.h) */ #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 FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */ #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) #define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX]) #define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX]) /* Returns the external filesystem UUID, the same one blkid returns */ #define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2) /* * Returns the path component under /sys/fs/ that refers to this filesystem; * also /sys/kernel/debug/ for filesystems with debugfs exports */ #define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path) /* * 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_VERITY_FL 0x00100000 /* Verity protected inode */ #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_DAX_FL 0x02000000 /* Inode is DAX */ #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */ #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */ #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 #define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \ SYNC_FILE_RANGE_WAIT_BEFORE | \ SYNC_FILE_RANGE_WAIT_AFTER) /* * Flags for preadv2/pwritev2: */ typedef int __bitwise __kernel_rwf_t; /* high priority request, poll if possible */ #define RWF_HIPRI ((__kernel_rwf_t)0x00000001) /* per-IO O_DSYNC */ #define RWF_DSYNC ((__kernel_rwf_t)0x00000002) /* per-IO O_SYNC */ #define RWF_SYNC ((__kernel_rwf_t)0x00000004) /* per-IO, return -EAGAIN if operation would block */ #define RWF_NOWAIT ((__kernel_rwf_t)0x00000008) /* per-IO O_APPEND */ #define RWF_APPEND ((__kernel_rwf_t)0x00000010) /* Atomic Write */ #define RWF_ATOMIC ((__kernel_rwf_t)0x00000040) /* mask of flags supported by the kernel */ #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ RWF_APPEND | RWF_ATOMIC) #endif /* _LINUX_FS_H */