FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/udf_i.h

     #ifndef _UDF_I_H
     #define _UDF_I_H
     
     /*
      * The i_data_sem and i_mutex serve for protection of allocation information
      * of a regular files and symlinks. This includes all extents belonging to
      * the file/symlink, a fact whether data are in-inode or in external data
      * blocks, preallocation, goal block information... When extents are read,
      * i_mutex or i_data_sem must be held (for reading is enough in case of
     * i_data_sem). When extents are changed, i_data_sem must be held for writing
     * and also i_mutex must be held.
     *
     * For directories i_mutex is used for all the necessary protection.
     */
    
    struct udf_inode_info {
            struct timespec         i_crtime;
            /* Physical address of inode */
            struct kernel_lb_addr           i_location;
            __u64                   i_unique;
            __u32                   i_lenEAttr;
            __u32                   i_lenAlloc;
            __u64                   i_lenExtents;
            __u32                   i_next_alloc_block;
            __u32                   i_next_alloc_goal;
            __u32                   i_checkpoint;
            unsigned                i_alloc_type : 3;
            unsigned                i_efe : 1;      /* extendedFileEntry */
            unsigned                i_use : 1;      /* unallocSpaceEntry */
            unsigned                i_strat4096 : 1;
            unsigned                reserved : 26;
            union {
                    struct short_ad *i_sad;
                    struct long_ad          *i_lad;
                    __u8            *i_data;
            } i_ext;
            struct rw_semaphore     i_data_sem;
            struct inode vfs_inode;
    };
    
    static inline struct udf_inode_info *UDF_I(struct inode *inode)
    {
            return list_entry(inode, struct udf_inode_info, vfs_inode);
    }
    
    #endif /* _UDF_I_H) */

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