include/linux/iflags.h

   1 #ifndef _LINUX_IFLAGS_H
   2 #define _LINUX_IFLAGS_H
   3
   4 /*
   5  * A universal set of inode flags.
   6  *
   7  * Originally taken from ext2/3 with additions for other filesystems.
   8  * Filesystems supporting this interface should interoperate with
   9  * the lsattr and chattr command line tools.
  10  *
  11  * This interface is supported in whole or in part by:
  12  * ext2
  13  * ext3
  14  * xfs
  15  * jfs
  16  * gfs2
  17  *
  18  */
  19
  20 #define IFLAGS_GET_IOC          _IOR('f', 1, long)
  21 #define IFLAGS_SET_IOC          _IOW('f', 2, long)
  22
  23 /*
  24  * These values are provided for use as indices of an array
  25  * for use with the iflags_cvt function below
  26  */
  27 enum {
  28         iflag_SecureRm          = 0,    /* Secure deletion */
  29         iflag_Unrm              = 1,    /* Undelete */
  30         iflag_Compress          = 2,    /* Compress file */
  31         iflag_Sync              = 3,    /* Synchronous updates */
  32         iflag_Immutable = 4,    /* Immutable */
  33         iflag_Append            = 5,    /* Append */
  34         iflag_NoDump            = 6,    /* Don't dump file */
  35         iflag_NoAtime           = 7,    /* No atime updates */
  36         /* Reserved for compression usage */
  37         iflag_Dirty             = 8,
  38         iflag_ComprBlk          = 9,    /* One or more compressed clusters */
  39         iflag_NoComp            = 10,   /* Don't compress */
  40         iflag_Ecompr            = 11,   /* Compression error */
  41         /* End of compression flags */
  42         iflag_Btree             = 12,   /* btree format dir */
  43         iflag_Index             = 12,   /* hash-indexed directory */
  44         iflag_Imagic            = 13,   /* AFS directory */
  45         iflag_JournalData       = 14,   /* file data should be journaled */
  46         iflag_NoTail            = 15,   /* file tail should not be merged */
  47         iflag_DirSync           = 16,   /* dirsync behaviour */
  48         iflag_TopDir            = 17,   /* Top of directory hierarchies */
  49         iflag_DirectIO          = 18,   /* Always use direct I/O on this file */
  50         iflag_InheritDirectIO   = 19,   /* Set DirectIO on new files in dir */
  51         iflag_InheritJdata      = 20,   /* Set JournalData on create in dir */
  52         iflag_Reserved          = 31    /* reserved for ext2/3 lib */
  53 };
  54
  55 #define __IFL(x) (1<<(iflag_##x))
  56 #define IFLAG_SECRM             __IFL(SecureRm)         /* 0x00000001 */
  57 #define IFLAG_UNRM              __IFL(Unrm)             /* 0x00000002 */
  58 #define IFLAG_COMPR             __IFL(Compr)            /* 0x00000004 */
  59 #define IFLAG_SYNC              __IFL(Sync)             /* 0x00000008 */
  60 #define IFLAG_IMMUTABLE         __IFL(Immutable)        /* 0x00000010 */
  61 #define IFLAG_APPEND            __IFL(Append)           /* 0x00000020 */
  62 #define IFLAG_NODUMP            __IFL(NoDump)           /* 0x00000040 */
  63 #define IFLAG_NOATIME           __IFL(NoAtime)          /* 0x00000080 */
  64 #define IFLAG_DIRTY             __IFL(Dirty)            /* 0x00000100 */
  65 #define IFLAG_COMPRBLK          __IFL(ComprBlk)         /* 0x00000200 */
  66 #define IFLAG_NOCOMP            __IFL(NoComp)           /* 0x00000400 */
  67 #define IFLAG_ECOMPR            __IFL(Ecompr)           /* 0x00000800 */
  68 #define IFLAG_BTREE             __IFL(Btree)            /* 0x00001000 */
  69 #define IFLAG_INDEX             __IFL(Index)            /* 0x00001000 */
  70 #define IFLAG_IMAGIC            __IFL(Imagic)           /* 0x00002000 */
  71 #define IFLAG_JOURNAL_DATA      __IFL(JournalData)      /* 0x00004000 */
  72 #define IFLAG_NOTAIL            __IFL(NoTail)           /* 0x00008000 */
  73 #define IFLAG_DIRSYNC           __IFL(DirSync)          /* 0x00010000 */
  74 #define IFLAG_TOPDIR            __IFL(TopDir)           /* 0x00020000 */
  75 #define IFLAG_DIRECTIO          __IFL(DirectIO)         /* 0x00040000 */
  76 #define IFLAG_INHERITDIRECTIO   __IFL(InheritDirectIO)  /* 0x00080000 */
  77 #define IFLAG_INHERITJDATA      __IFL(InheritJdata)     /* 0x00100000 */
  78 #define IFLAG_RESERVED          __IFL(Reserved)         /* 0x80000000 */
  79
  80 #ifdef __KERNEL__
  81 /**
  82  * iflags_cvt
  83  * @table: A table of 32 u32 flags
  84  * @val: a 32 bit value to convert
  85  *
  86  * This function can be used to convert between IFLAGS values and
  87  * the filesystem's own flags values.
  88  *
  89  * Returns: the converted flags
  90  */
  91 static inline u32 iflags_cvt(const u32 *table, u32 val)
  92 {
  93         u32 res = 0;
  94         while(val) {
  95                 if (val & 1)
  96                         res |= *table;
  97                 table++;
  98                 val >>= 1;
  99         }
 100         return res;
 101 }
 102 #endif /* __KERNEL__ */
 103
 104 #endif /* _LINUX_IFLAGS_H */