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 11 struct 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 #ifdef CONFIG_TMPFS_POSIX_ACL 23 struct posix_acl *i_acl; 24 struct posix_acl *i_default_acl; 25 #endif 26 }; 27 28 struct shmem_sb_info { 29 unsigned long max_blocks; /* How many blocks are allowed */ 30 unsigned long free_blocks; /* How many are left for allocation */ 31 unsigned long max_inodes; /* How many inodes are allowed */ 32 unsigned long free_inodes; /* How many are left for allocation */ 33 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ 34 uid_t uid; /* Mount uid for root directory */ 35 gid_t gid; /* Mount gid for root directory */ 36 mode_t mode; /* Mount mode for root directory */ 37 int policy; /* Default NUMA memory alloc policy */ 38 nodemask_t policy_nodes; /* nodemask for preferred and bind */ 39 }; 40 41 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) 42 { 43 return container_of(inode, struct shmem_inode_info, vfs_inode); 44 } 45 46 #ifdef CONFIG_TMPFS_POSIX_ACL 47 int shmem_permission(struct inode *, int, struct nameidata *); 48 int shmem_acl_init(struct inode *, struct inode *); 49 void shmem_acl_destroy_inode(struct inode *); 50 51 extern struct xattr_handler shmem_xattr_acl_access_handler; 52 extern struct xattr_handler shmem_xattr_acl_default_handler; 53 54 extern struct generic_acl_operations shmem_acl_ops; 55 56 #else 57 static inline int shmem_acl_init(struct inode *inode, struct inode *dir) 58 { 59 return 0; 60 } 61 static inline void shmem_acl_destroy_inode(struct inode *inode) 62 { 63 } 64 #endif /* CONFIG_TMPFS_POSIX_ACL */ 65 66 #endif 67