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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 */
akpm@linux-foundation.org680d7942008-02-08 04:21:48 -080029 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 */
Lee Schermerhorn71fe8042008-04-28 02:13:26 -070033 struct mempolicy *mpol; /* default memory policy for mappings */
Linus Torvalds1da177e2005-04-16 15:20:36 -070034};
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
Kay Sievers2b2af542009-04-30 15:23:42 +020041extern int init_tmpfs(void);
42extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
43
Andreas Gruenbacher39f02472006-09-29 02:01:35 -070044#ifdef CONFIG_TMPFS_POSIX_ACL
Linus Torvalds6d848a42009-08-28 12:04:28 -070045int shmem_check_acl(struct inode *, int);
Andreas Gruenbacher39f02472006-09-29 02:01:35 -070046int shmem_acl_init(struct inode *, struct inode *);
Andreas Gruenbacher39f02472006-09-29 02:01:35 -070047
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}
Andreas Gruenbacher39f02472006-09-29 02:01:35 -070058#endif /* CONFIG_TMPFS_POSIX_ACL */
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#endif