RT-AC56 3.0.0.4.374.37 core

[tomato.git] / release / src-rt-6.x.4708 / toolchains / hndtools-arm-linux-2.6.36-uclibc-4.5.3 / arm-brcm-linux-uclibcgnueabi / sysroot / usr / include / linux / fs.h

#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>
#include <linux/blk_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 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
#define MAY_CHDIR 64

/*
 * 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)0x1)
/* file is open for writing */
#define FMODE_WRITE             ((fmode_t)0x2)
/* file is seekable */
#define FMODE_LSEEK             ((fmode_t)0x4)
/* file can be accessed using pread */
#define FMODE_PREAD             ((fmode_t)0x8)
/* file can be accessed using pwrite */
#define FMODE_PWRITE            ((fmode_t)0x10)
/* File is opened for execution with sys_execve / sys_uselib */
#define FMODE_EXEC              ((fmode_t)0x20)
/* File is opened with O_NDELAY (only set for block devices) */
#define FMODE_NDELAY            ((fmode_t)0x40)
/* File is opened with O_EXCL (only set for block devices) */
#define FMODE_EXCL              ((fmode_t)0x80)
/* File is opened using open(.., 3, ..) and is writeable only for ioctls
   (specialy hack for floppy.c) */
#define FMODE_WRITE_IOCTL       ((fmode_t)0x100)

/*
 * 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)0x800)

/* Expect random access pattern */
#define FMODE_RANDOM            ((fmode_t)0x1000)

/* File was opened by fanotify and shouldn't generate fanotify events */
#define FMODE_NONOTIFY          ((fmode_t)0x1000000)

/*
 * 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.
 * 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_PLUG   Special case write for O_DIRECT only.
 * WRITE_BARRIER        Like WRITE_SYNC, 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                 REQ_WRITE
#define RWA_MASK                REQ_RAHEAD

#define READ                    0
#define WRITE                   RW_MASK
#define READA                   RWA_MASK

#define READ_SYNC               (READ | REQ_SYNC | REQ_UNPLUG)
#define READ_META               (READ | REQ_META)
#define WRITE_SYNC_PLUG         (WRITE | REQ_SYNC | REQ_NOIDLE)
#define WRITE_SYNC              (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
#define WRITE_ODIRECT_PLUG      (WRITE | REQ_SYNC)
#define WRITE_META              (WRITE | REQ_META)
#define WRITE_BARRIER           (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
                                 REQ_HARDBARRIER)

/*
 * 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       (WRITE | REQ_DISCARD)
#define DISCARD_BARRIER         (WRITE | REQ_DISCARD | REQ_HARDBARRIER)
#define DISCARD_SECURE          (DISCARD_NOBARRIER | REQ_SECURE)

#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_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)

/*
 * 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 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 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 */