1#ifndef __SHMEM_FS_H 2#define __SHMEM_FS_H 3 4/* inode in-kernel data */ 5 6#define SHMEM_NR_DIRECT 16 7 8/* 9 * A swap entry has to fit into a "unsigned long", as 10 * the entry is hidden in the "index" field of the 11 * swapper address space. 12 * 13 * We have to move it here, since not every user of fs.h is including 14 * mm.h, but mm.h is including fs.h via sched .h :-/ 15 */ 16typedef struct { 17 unsigned long val; 18} swp_entry_t; 19 20extern atomic_t shmem_nrpages; 21 22struct shmem_inode_info { 23 spinlock_t lock; 24 struct semaphore sem; 25 unsigned long next_index; 26 swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* for the first blocks */ 27 void **i_indirect; /* indirect blocks */ 28 unsigned long swapped; 29 int locked; /* into memory */ 30 struct list_head list; 31 struct inode *inode; 32}; 33 34struct shmem_sb_info { 35 unsigned long max_blocks; /* How many blocks are allowed */ 36 unsigned long free_blocks; /* How many are left for allocation */ 37 unsigned long max_inodes; /* How many inodes are allowed */ 38 unsigned long free_inodes; /* How many are left for allocation */ 39 spinlock_t stat_lock; 40}; 41 42#define SHMEM_I(inode) (&inode->u.shmem_i) 43 44#endif 45