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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>

#include <linux/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_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

struct fstrim_range {

        __u64 start;

        __u64 len;

        __u64 minlen;

};

/* 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 */

/*

 * 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 */

/* These sb flags are internal to the kernel */

#define MS_NOSEC        (1<<28)

#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

/* 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 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 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_NOCOW_FL                     0x00800000 /* Do not cow file */

#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 */