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- #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 */
-