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TOMOYO Linux Cross Reference
Linux/fs/udf/udf_i.h

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  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) */
 64 

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