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
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