fs/udf/udf_i.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _UDF_I_H
   3 #define _UDF_I_H
   4
   5 struct extent_position {
   6         struct buffer_head *bh;
   7         uint32_t offset;
   8         struct kernel_lb_addr block;
   9 };
  10
  11 struct udf_ext_cache {
  12         /* Extent position */
  13         struct extent_position epos;
  14         /* Start logical offset in bytes */
  15         loff_t lstart;
  16 };
  17
  18 /*
  19  * The i_data_sem and i_mutex serve for protection of allocation information
  20  * of a regular files and symlinks. This includes all extents belonging to
  21  * the file/symlink, a fact whether data are in-inode or in external data
  22  * blocks, preallocation, goal block information... When extents are read,
  23  * i_mutex or i_data_sem must be held (for reading is enough in case of
  24  * i_data_sem). When extents are changed, i_data_sem must be held for writing
  25  * and also i_mutex must be held.
  26  *
  27  * For directories i_mutex is used for all the necessary protection.
  28  */
  29
  30 struct udf_inode_info {
  31         struct timespec         i_crtime;
  32         /* Physical address of inode */
  33         struct kernel_lb_addr           i_location;
  34         __u64                   i_unique;
  35         __u32                   i_lenEAttr;
  36         __u32                   i_lenAlloc;
  37         __u64                   i_lenExtents;
  38         __u32                   i_next_alloc_block;
  39         __u32                   i_next_alloc_goal;
  40         __u32                   i_checkpoint;
  41         unsigned                i_alloc_type : 3;
  42         unsigned                i_efe : 1;      /* extendedFileEntry */
  43         unsigned                i_use : 1;      /* unallocSpaceEntry */
  44         unsigned                i_strat4096 : 1;
  45         unsigned                reserved : 26;
  46         union {
  47                 struct short_ad *i_sad;
  48                 struct long_ad          *i_lad;
  49                 __u8            *i_data;
  50         } i_ext;
  51         struct rw_semaphore     i_data_sem;
  52         struct udf_ext_cache cached_extent;
  53         /* Spinlock for protecting extent cache */
  54         spinlock_t i_extent_cache_lock;
  55         struct inode vfs_inode;
  56 };
  57
  58 static inline struct udf_inode_info *UDF_I(struct inode *inode)
  59 {
  60         return container_of(inode, struct udf_inode_info, vfs_inode);
  61 }
  62
  63 #endif /* _UDF_I_H) */