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#ifdef CONFIG_TMPFS_POSIX_ACL
23	struct posix_acl	*i_acl;
24	struct posix_acl	*i_default_acl;
25#endif
26};
27
28struct 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	int policy;		    /* Default NUMA memory alloc policy */
34	nodemask_t policy_nodes;    /* nodemask for preferred and bind */
35	spinlock_t    stat_lock;
36};
37
38static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
39{
40	return container_of(inode, struct shmem_inode_info, vfs_inode);
41}
42
43#ifdef CONFIG_TMPFS_POSIX_ACL
44int shmem_permission(struct inode *, int, struct nameidata *);
45int shmem_acl_init(struct inode *, struct inode *);
46void shmem_acl_destroy_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}
58static inline void shmem_acl_destroy_inode(struct inode *inode)
59{
60}
61#endif  /* CONFIG_TMPFS_POSIX_ACL */
62
63#endif
64