reactos/drivers/filesystems/ext2_new/inc/linux/fs.h

   1 #ifndef _LINUX_FS_INCLUDE_
   2 #define _LINUX_FS_INCLUDE_
   3
   4 #include <linux/types.h>
   5 #include <linux/atomic.h>
   6
   7 //
   8 // kdev
   9 //
  10
  11 #define NODEV           0
  12
  13 typedef struct block_device * kdev_t;
  14
  15 #define MINORBITS   8
  16 #define MINORMASK   ((1U << MINORBITS) - 1)
  17
  18 #define MAJOR(dev)   ((unsigned int)((int)(dev) >> MINORBITS))
  19 #define MINOR(dev)   ((unsigned int)((int)(dev) & MINORMASK))
  20
  21 static inline unsigned int kdev_t_to_nr(kdev_t dev) {
  22     /*return (unsigned int)(MAJOR(dev)<<8) | MINOR(dev);*/
  23     return 0;
  24 }
  25
  26 #define NODEV           0
  27 #define MKDEV(ma,mi)    (((ma) << MINORBITS) | (mi))
  28
  29 static inline kdev_t to_kdev_t(int dev)
  30 {
  31 #if 0
  32     int major, minor;
  33 #if 0
  34     major = (dev >> 16);
  35     if (!major) {
  36         major = (dev >> 8);
  37         minor = (dev & 0xff);
  38     } else
  39         minor = (dev & 0xffff);
  40 #else
  41     major = (dev >> 8);
  42     minor = (dev & 0xff);
  43 #endif
  44     return (kdev_t) MKDEV(major, minor);
  45 #endif
  46     return 0;
  47 }
  48
  49
  50 //
  51 // file system specific structures
  52 //
  53
  54 /*
  55  * Kernel pointers have redundant information, so we can use a
  56  * scheme where we can return either an error code or a dentry
  57  * pointer with the same return value.
  58  *
  59  * This should be a per-architecture thing, to allow different
  60  * error and pointer decisions.
  61  */
  62
  63 struct super_block {
  64     unsigned long       s_magic;
  65     unsigned long       s_flags;
  66     unsigned long               s_blocksize;        /* blocksize */
  67     unsigned long long  s_maxbytes;
  68     unsigned char               s_blocksize_bits;   /* bits of blocksize */
  69     unsigned char               s_dirt;             /* any thing */
  70     char                s_id[30];           /* id string */
  71     kdev_t              s_bdev;             /* block_device */
  72     void *              s_priv;             /* EXT2_VCB */
  73     struct dentry      *s_root;
  74     void               *s_fs_info;
  75 };
  76
  77 struct inode {
  78     __u32               i_ino;              /* inode number */
  79     loff_t                          i_size;             /* size */
  80     __u32               i_atime;                /* Access time */
  81     __u32               i_ctime;                /* Creation time */
  82     __u32               i_mtime;                /* Modification time */
  83     __u32               i_dtime;                /* Deletion Time */
  84     __u64               i_blocks;
  85     __u32               i_block[15];
  86     umode_t                         i_mode;             /* mode */
  87     uid_t               i_uid;
  88     gid_t               i_gid;
  89     atomic_t            i_count;            /* ref count */
  90     __u16               i_nlink;
  91     __u32               i_generation;
  92     __u32               i_version;
  93     __u32               i_flags;
  94
  95     struct super_block *i_sb;               /* super_block */
  96     void               *i_priv;             /* EXT2_MCB */
  97 };
  98
  99 //
 100 //  Inode state bits
 101 //
 102
 103 #define I_DIRTY_SYNC        1 /* Not dirty enough for O_DATASYNC */
 104 #define I_DIRTY_DATASYNC    2 /* Data-related inode changes pending */
 105 #define I_DIRTY_PAGES       4 /* Data-related inode changes pending */
 106 #define I_LOCK              8
 107 #define I_FREEING          16
 108 #define I_CLEAR            32
 109
 110 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
 111
 112
 113 struct dentry {
 114     atomic_t                d_count;
 115     struct {
 116         int             len;
 117         char           *name;
 118     } d_name;
 119     struct inode           *d_inode;
 120     struct dentry          *d_parent;
 121     void                   *d_fsdata;
 122     struct super_block     *d_sb;
 123 };
 124
 125 struct file {
 126
 127     unsigned int    f_flags;
 128     umode_t         f_mode;
 129     __u32           f_version;
 130     __int64         f_size;
 131     loff_t          f_pos;
 132     struct dentry  *f_dentry;
 133     void           *private_data;
 134 };
 135
 136 /*
 137  * File types
 138  *
 139  * NOTE! These match bits 12..15 of stat.st_mode
 140  * (ie "(i_mode >> 12) & 15").
 141  */
 142 #define DT_UNKNOWN      0
 143 #define DT_FIFO         1
 144 #define DT_CHR          2
 145 #define DT_DIR          4
 146 #define DT_BLK          6
 147 #define DT_REG          8
 148 #define DT_LNK          10
 149 #define DT_SOCK         12
 150 #define DT_WHT          14
 151
 152 void iget(struct inode *inode);
 153 void iput(struct inode *inode);
 154 ULONGLONG bmap(struct inode *i, ULONGLONG b);
 155
 156 #endif /*_LINUX_FS_INCLUDE_*/