1#ifndef __SHMEM_FS_H 2#define __SHMEM_FS_H 3 4#include <linux/swap.h> 5#include <linux/mempolicy.h> 6#include <linux/percpu_counter.h> 7 8/* inode in-kernel data */ 9 10#define SHMEM_NR_DIRECT 16 11 12struct shmem_inode_info { 13 spinlock_t lock; 14 unsigned long flags; 15 unsigned long alloced; /* data pages alloced to file */ 16 unsigned long swapped; /* subtotal assigned to swap */ 17 unsigned long next_index; /* highest alloced index + 1 */ 18 struct shared_policy policy; /* NUMA memory alloc policy */ 19 struct page *i_indirect; /* top indirect blocks page */ 20 swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */ 21 struct list_head swaplist; /* chain of maybes on swap */ 22 struct inode vfs_inode; 23}; 24 25struct shmem_sb_info { 26 unsigned long max_blocks; /* How many blocks are allowed */ 27 struct percpu_counter used_blocks; /* How many are allocated */ 28 unsigned long max_inodes; /* How many inodes are allowed */ 29 unsigned long free_inodes; /* How many are left for allocation */ 30 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ 31 uid_t uid; /* Mount uid for root directory */ 32 gid_t gid; /* Mount gid for root directory */ 33 mode_t mode; /* Mount mode for root directory */ 34 struct mempolicy *mpol; /* default memory policy for mappings */ 35}; 36 37static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) 38{ 39 return container_of(inode, struct shmem_inode_info, vfs_inode); 40} 41 42extern int init_tmpfs(void); 43extern int shmem_fill_super(struct super_block *sb, void *data, int silent); 44 45#endif 46