linux/fs/udf/udf_i.h
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   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
  16struct 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        __u32                   i_checkpoint;
  27        unsigned                i_alloc_type : 3;
  28        unsigned                i_efe : 1;      /* extendedFileEntry */
  29        unsigned                i_use : 1;      /* unallocSpaceEntry */
  30        unsigned                i_strat4096 : 1;
  31        unsigned                reserved : 26;
  32        union {
  33                struct short_ad *i_sad;
  34                struct long_ad          *i_lad;
  35                __u8            *i_data;
  36        } i_ext;
  37        struct rw_semaphore     i_data_sem;
  38        struct inode vfs_inode;
  39};
  40
  41static inline struct udf_inode_info *UDF_I(struct inode *inode)
  42{
  43        return list_entry(inode, struct udf_inode_info, vfs_inode);
  44}
  45
  46#endif /* _UDF_I_H) */
  47
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