fs/udf/udf_i.h

   1 #ifndef _UDF_I_H
   2 #define _UDF_I_H
   3
   4 /*
   5  * The i_data_sem and i_mutex serve for protection of allocation information
   6  * of a regular files and symlinks. This includes all extents belonging to
   7  * the file/symlink, a fact whether data are in-inode or in external data
   8  * blocks, preallocation, goal block information... When extents are read,
   9  * i_mutex or i_data_sem must be held (for reading is enough in case of
  10  * i_data_sem). When extents are changed, i_data_sem must be held for writing
  11  * and also i_mutex must be held.
  12  *
  13  * For directories i_mutex is used for all the necessary protection.
  14  */
  15
  16 struct udf_inode_info {
  17         struct timespec         i_crtime;
  18         /* Physical address of inode */
  19         struct kernel_lb_addr           i_location;
  20         __u64                   i_unique;
  21         __u32                   i_lenEAttr;
  22         __u32                   i_lenAlloc;
  23         __u64                   i_lenExtents;
  24         __u32                   i_next_alloc_block;
  25         __u32                   i_next_alloc_goal;
  26         unsigned                i_alloc_type : 3;
  27         unsigned                i_efe : 1;      /* extendedFileEntry */
  28         unsigned                i_use : 1;      /* unallocSpaceEntry */
  29         unsigned                i_strat4096 : 1;
  30         unsigned                reserved : 26;
  31         union {
  32                 struct short_ad *i_sad;
  33                 struct long_ad          *i_lad;
  34                 __u8            *i_data;
  35         } i_ext;
  36         struct rw_semaphore     i_data_sem;
  37         struct inode vfs_inode;
  38 };
  39
  40 static inline struct udf_inode_info *UDF_I(struct inode *inode)
  41 {
  42         return list_entry(inode, struct udf_inode_info, vfs_inode);
  43 }
  44
  45 #endif /* _UDF_I_H) */