fs/udf/udf_i.h

   1 #ifndef _UDF_I_H
   2 #define _UDF_I_H
   3
   4 struct extent_position {
   5         struct buffer_head *bh;
   6         uint32_t offset;
   7         struct kernel_lb_addr block;
   8 };
   9
  10 struct udf_ext_cache {
  11         /* Extent position */
  12         struct extent_position epos;
  13         /* Start logical offset in bytes */
  14         loff_t lstart;
  15 };
  16
  17 /*
  18  * The i_data_sem and i_mutex serve for protection of allocation information
  19  * of a regular files and symlinks. This includes all extents belonging to
  20  * the file/symlink, a fact whether data are in-inode or in external data
  21  * blocks, preallocation, goal block information... When extents are read,
  22  * i_mutex or i_data_sem must be held (for reading is enough in case of
  23  * i_data_sem). When extents are changed, i_data_sem must be held for writing
  24  * and also i_mutex must be held.
  25  *
  26  * For directories i_mutex is used for all the necessary protection.
  27  */
  28
  29 struct udf_inode_info {
  30         struct timespec         i_crtime;
  31         /* Physical address of inode */
  32         struct kernel_lb_addr           i_location;
  33         __u64                   i_unique;
  34         __u32                   i_lenEAttr;
  35         __u32                   i_lenAlloc;
  36         __u64                   i_lenExtents;
  37         __u32                   i_next_alloc_block;
  38         __u32                   i_next_alloc_goal;
  39         __u32                   i_checkpoint;
  40         unsigned                i_alloc_type : 3;
  41         unsigned                i_efe : 1;      /* extendedFileEntry */
  42         unsigned                i_use : 1;      /* unallocSpaceEntry */
  43         unsigned                i_strat4096 : 1;
  44         unsigned                reserved : 26;
  45         union {
  46                 struct short_ad *i_sad;
  47                 struct long_ad          *i_lad;
  48                 __u8            *i_data;
  49         } i_ext;
  50         struct rw_semaphore     i_data_sem;
  51         struct udf_ext_cache cached_extent;
  52         /* Spinlock for protecting extent cache */
  53         spinlock_t i_extent_cache_lock;
  54         struct inode vfs_inode;
  55 };
  56
  57 static inline struct udf_inode_info *UDF_I(struct inode *inode)
  58 {
  59         return list_entry(inode, struct udf_inode_info, vfs_inode);
  60 }
  61
  62 #endif /* _UDF_I_H) */