include/linux/affs_fs_i.h

   1 #ifndef _AFFS_FS_I
   2 #define _AFFS_FS_I
   3
   4 #include <linux/a.out.h>
   5 #include <linux/fs.h>
   6 #include <asm/semaphore.h>
   7
   8 #define AFFS_CACHE_SIZE         PAGE_SIZE
   9 //#define AFFS_CACHE_SIZE               (4*4)
  10
  11 #define AFFS_MAX_PREALLOC       32
  12 #define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  13 #define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  14 #define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  15
  16 struct affs_ext_key {
  17         u32     ext;                            /* idx of the extended block */
  18         u32     key;                            /* block number */
  19 };
  20
  21 /*
  22  * affs fs inode data in memory
  23  */
  24 struct affs_inode_info {
  25         u32      i_opencnt;
  26         struct semaphore i_link_lock;           /* Protects internal inode access. */
  27         struct semaphore i_ext_lock;            /* Protects internal inode access. */
  28 #define i_hash_lock i_ext_lock
  29         u32      i_blkcnt;                      /* block count */
  30         u32      i_extcnt;                      /* extended block count */
  31         u32     *i_lc;                          /* linear cache of extended blocks */
  32         u32      i_lc_size;
  33         u32      i_lc_shift;
  34         u32      i_lc_mask;
  35         struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  36         u32      i_ext_last;                    /* last accessed extended block */
  37         struct buffer_head *i_ext_bh;           /* bh of last extended block */
  38         loff_t   mmu_private;
  39         u32      i_protect;                     /* unused attribute bits */
  40         u32      i_lastalloc;                   /* last allocated block */
  41         int      i_pa_cnt;                      /* number of preallocated blocks */
  42 #if 0
  43         s32      i_original;                    /* if != 0, this is the key of the original */
  44         u32      i_data[AFFS_MAX_PREALLOC];     /* preallocated blocks */
  45         int      i_cache_users;                 /* Cache cannot be freed while > 0 */
  46         unsigned char i_hlink;                  /* This is a fake */
  47         unsigned char i_pad;
  48         s32      i_parent;                      /* parent ino */
  49 #endif
  50         struct inode vfs_inode;
  51 };
  52
  53 /* short cut to get to the affs specific inode data */
  54 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  55 {
  56         return list_entry(inode, struct affs_inode_info, vfs_inode);
  57 }
  58
  59 #endif