linux/fs/udf/udf_i.h
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   1#ifndef _UDF_I_H
   2#define _UDF_I_H
   3
   4struct extent_position {
   5        struct buffer_head *bh;
   6        uint32_t offset;
   7        struct kernel_lb_addr block;
   8};
   9
  10struct 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
  29struct 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
  57static 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) */
  63
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