include/linux/umsdos_fs_i.h

   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