| #ifndef _LINUX_FS_H |
| #define _LINUX_FS_H |
| |
| /* |
| * This file has definitions for some important file table |
| * structures etc. |
| */ |
| |
| #include <linux/limits.h> |
| #include <linux/ioctl.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 1024 /* Initial setting 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_MAX SEEK_END |
| |
| /* And dynamically-tunable limits and defaults: */ |
| struct files_stat_struct { |
| int nr_files; /* read only */ |
| int nr_free_files; /* read only */ |
| int max_files; /* tunable */ |
| }; |
| |
| struct inodes_stat_t { |
| int nr_inodes; |
| int nr_unused; |
| int dummy[5]; /* padding for sysctl ABI compatibility */ |
| }; |
| |
| |
| #define NR_FILE 8192 /* this can well be larger on a larger system */ |
| |
| #define MAY_EXEC 1 |
| #define MAY_WRITE 2 |
| #define MAY_READ 4 |
| #define MAY_APPEND 8 |
| #define MAY_ACCESS 16 |
| #define MAY_OPEN 32 |
| |
| /* |
| * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| */ |
| |
| /* file is open for reading */ |
| #define FMODE_READ ((fmode_t)1) |
| /* file is open for writing */ |
| #define FMODE_WRITE ((fmode_t)2) |
| /* file is seekable */ |
| #define FMODE_LSEEK ((fmode_t)4) |
| /* file can be accessed using pread */ |
| #define FMODE_PREAD ((fmode_t)8) |
| /* file can be accessed using pwrite */ |
| #define FMODE_PWRITE ((fmode_t)16) |
| /* File is opened for execution with sys_execve / sys_uselib */ |
| #define FMODE_EXEC ((fmode_t)32) |
| /* File is opened with O_NDELAY (only set for block devices) */ |
| #define FMODE_NDELAY ((fmode_t)64) |
| /* File is opened with O_EXCL (only set for block devices) */ |
| #define FMODE_EXCL ((fmode_t)128) |
| /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| (specialy hack for floppy.c) */ |
| #define FMODE_WRITE_IOCTL ((fmode_t)256) |
| |
| /* |
| * Don't update ctime and mtime. |
| * |
| * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| */ |
| #define FMODE_NOCMTIME ((fmode_t)2048) |
| |
| /* |
| * The below are the various read and write types that we support. Some of |
| * them include behavioral modifiers that send information down to the |
| * block layer and IO scheduler. Terminology: |
| * |
| * The block layer uses device plugging to defer IO a little bit, in |
| * the hope that we will see more IO very shortly. This increases |
| * coalescing of adjacent IO and thus reduces the number of IOs we |
| * have to send to the device. It also allows for better queuing, |
| * if the IO isn't mergeable. If the caller is going to be waiting |
| * for the IO, then he must ensure that the device is unplugged so |
| * that the IO is dispatched to the driver. |
| * |
| * All IO is handled async in Linux. This is fine for background |
| * writes, but for reads or writes that someone waits for completion |
| * on, we want to notify the block layer and IO scheduler so that they |
| * know about it. That allows them to make better scheduling |
| * decisions. So when the below references 'sync' and 'async', it |
| * is referencing this priority hint. |
| * |
| * With that in mind, the available types are: |
| * |
| * READ A normal read operation. Device will be plugged. |
| * READ_SYNC A synchronous read. Device is not plugged, caller can |
| * immediately wait on this read without caring about |
| * unplugging. |
| * READA Used for read-ahead operations. Lower priority, and the |
| * block layer could (in theory) choose to ignore this |
| * request if it runs into resource problems. |
| * WRITE A normal async write. Device will be plugged. |
| * SWRITE Like WRITE, but a special case for ll_rw_block() that |
| * tells it to lock the buffer first. Normally a buffer |
| * must be locked before doing IO. |
| * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down |
| * the hint that someone will be waiting on this IO |
| * shortly. The device must still be unplugged explicitly, |
| * WRITE_SYNC_PLUG does not do this as we could be |
| * submitting more writes before we actually wait on any |
| * of them. |
| * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device |
| * immediately after submission. The write equivalent |
| * of READ_SYNC. |
| * WRITE_ODIRECT Special case write for O_DIRECT only. |
| * SWRITE_SYNC |
| * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer. |
| * See SWRITE. |
| * WRITE_BARRIER Like WRITE, but tells the block layer that all |
| * previously submitted writes must be safely on storage |
| * before this one is started. Also guarantees that when |
| * this write is complete, it itself is also safely on |
| * storage. Prevents reordering of writes on both sides |
| * of this IO. |
| * |
| */ |
| #define RW_MASK 1 |
| #define RWA_MASK 2 |
| #define READ 0 |
| #define WRITE 1 |
| #define READA 2 /* read-ahead - don't block if no resources */ |
| #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
| #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) |
| #define READ_META (READ | (1 << BIO_RW_META)) |
| #define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) |
| #define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) |
| #define WRITE_ODIRECT (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) |
| #define SWRITE_SYNC_PLUG \ |
| (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) |
| #define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) |
| #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER)) |
| |
| /* |
| * These aren't really reads or writes, they pass down information about |
| * parts of device that are now unused by the file system. |
| */ |
| #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD) |
| #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER)) |
| |
| #define SEL_IN 1 |
| #define SEL_OUT 2 |
| #define SEL_EX 4 |
| |
| /* public flags for file_system_type */ |
| #define FS_REQUIRES_DEV 1 |
| #define FS_BINARY_MOUNTDATA 2 |
| #define FS_HAS_SUBTYPE 4 |
| #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
| #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
| * during rename() internally. |
| */ |
| |
| /* |
| * 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_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) |
| |
| /* |
| * Old magic mount flag and mask |
| */ |
| #define MS_MGC_VAL 0xC0ED0000 |
| #define MS_MGC_MSK 0xffff0000 |
| |
| /* Inode flags - they have nothing to superblock flags now */ |
| |
| #define S_SYNC 1 /* Writes are synced at once */ |
| #define S_NOATIME 2 /* Do not update access times */ |
| #define S_APPEND 4 /* Append-only file */ |
| #define S_IMMUTABLE 8 /* Immutable file */ |
| #define S_DEAD 16 /* removed, but still open directory */ |
| #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| #define S_PRIVATE 512 /* Inode is fs-internal */ |
| |
| /* |
| * Note that nosuid etc flags are inode-specific: setting some file-system |
| * flags just means all the inodes inherit those flags by default. It might be |
| * possible to override it selectively if you really wanted to with some |
| * ioctl() that is not currently implemented. |
| * |
| * Exception: MS_RDONLY is always applied to the entire file system. |
| * |
| * Unfortunately, it is possible to change a filesystems flags with it mounted |
| * with files in use. This means that all of the inodes will not have their |
| * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| */ |
| #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
| |
| #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| ((inode)->i_flags & S_SYNC)) |
| #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
| #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
| |
| #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| |
| #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| |
| /* 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 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 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) |
| |
| /* |
| * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) |
| */ |
| #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 */ |
| #define FS_ECOMPR_FL 0x00000800 /* Compression error */ |
| /* End compression flags --- maybe not all used */ |
| #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_EXTENT_FL 0x00080000 /* Extents */ |
| #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ |
| #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 /* _LINUX_FS_H */ |
