1#ifndef __SHMEM_FS_H 2#define __SHMEM_FS_H 3 4#include <linux/swap.h> 5#include <linux/mempolicy.h> 6 7/* inode in-kernel data */ 8 9#define SHMEM_NR_DIRECT 16 10 11struct shmem_inode_info { 12 spinlock_t lock; 13 unsigned long flags; 14 unsigned long alloced; /* data pages alloced to file */ 15 unsigned long swapped; /* subtotal assigned to swap */ 16 unsigned long next_index; /* highest alloced index + 1 */ 17 struct shared_policy policy; /* NUMA memory alloc policy */ 18 struct page *i_indirect; /* top indirect blocks page */ 19 swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */ 20 struct list_head swaplist; /* chain of maybes on swap */ 21 struct inode vfs_inode; 22}; 23 24struct shmem_sb_info { 25 unsigned long max_blocks; /* How many blocks are allowed */ 26 unsigned long free_blocks; /* How many are left for allocation */ 27 unsigned long max_inodes; /* How many inodes are allowed */ 28 unsigned long free_inodes; /* How many are left for allocation */ 29 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ 30 uid_t uid; /* Mount uid for root directory */ 31 gid_t gid; /* Mount gid for root directory */ 32 mode_t mode; /* Mount mode for root directory */ 33 struct mempolicy *mpol; /* default memory policy for mappings */ 34}; 35 36static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) 37{ 38 return container_of(inode, struct shmem_inode_info, vfs_inode); 39} 40 41extern int init_tmpfs(void); 42extern int shmem_fill_super(struct super_block *sb, void *data, int silent); 43 44#ifdef CONFIG_TMPFS_POSIX_ACL 45int shmem_check_acl(struct inode *, int); 46int shmem_acl_init(struct inode *, struct inode *); 47 48extern struct xattr_handler shmem_xattr_acl_access_handler; 49extern struct xattr_handler shmem_xattr_acl_default_handler; 50 51extern struct generic_acl_operations shmem_acl_ops; 52 53#else 54static inline int shmem_acl_init(struct inode *inode, struct inode *dir) 55{ 56 return 0; 57} 58#endif /* CONFIG_TMPFS_POSIX_ACL */ 59 60#endif 61