1 #ifndef UMSDOS_FS_I_H
2 #define UMSDOS_FS_I_H
3 
4 #ifndef _LINUX_TYPES_H
5 #include <linux/types.h>
6 #endif
7 
8 #include <linux/msdos_fs_i.h>
9 #include <linux/pipe_fs_i.h>
10 
11 /* #Specification: strategy / in memory inode
12  * Here is the information specific to the inode of the UMSDOS file
13  * system. This information is added to the end of the standard struct
14  * inode. Each file system has its own extension to struct inode,
15  * so do the umsdos file system.
16  *
17  * The strategy is to have the umsdos_inode_info as a superset of
18  * the msdos_inode_info, since most of the time the job is done
19  * by the msdos fs code.
20  *
21  * So we duplicate the msdos_inode_info, and add our own info at the
22  * end.
23  *
24  * The offset in this EMD file of the entry: pos
25  *
26  * For directory, we have dir_locking_info to help synchronise
27  * file creation and file lookup. See also msdos_fs_i.h for more
28  * information about msdos_inode_info.
29  *
30  * Special file and fifo do have an inode which correspond to an
31  * empty MSDOS file.
32  *
33  * symlink are processed mostly like regular file. The content is the
34  * link.
35  *
36  * The UMSDOS specific extension is placed after the union.
37  */
38 
39 struct dir_locking_info {
40 	wait_queue_head_t p;
41 	short int looking;	/* How many process doing a lookup */
42 	short int creating;	/* Is there any creation going on here
43 				 *  Only one at a time, although one
44 				 *  may recursively lock, so it is a counter
45 				 */
46 	long pid;		/* pid of the process owning the creation
47 				 * lock */
48 };
49 
50 struct umsdos_inode_info {
51 	struct msdos_inode_info msdos_info;
52 	struct dir_locking_info dir_info;
53 	int i_patched;			/* Inode has been patched */
54 	int i_is_hlink;			/* Resolved hardlink inode? */
55 	off_t pos;			/* Entry offset in the emd_owner file */
56 };
57 
58 #endif
59