]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __SHMEM_FS_H |
2 | #define __SHMEM_FS_H | |
3 | ||
4 | #include <linux/swap.h> | |
5 | #include <linux/mempolicy.h> | |
7e496299 | 6 | #include <linux/percpu_counter.h> |
1da177e4 | 7 | |
072441e2 HD |
8 | struct page; |
9 | struct file; | |
10 | struct inode; | |
11 | struct super_block; | |
12 | struct user_struct; | |
13 | struct vm_area_struct; | |
14 | ||
1da177e4 LT |
15 | /* inode in-kernel data */ |
16 | ||
17 | #define SHMEM_NR_DIRECT 16 | |
18 | ||
b09e0fa4 EP |
19 | #define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t)) |
20 | ||
1da177e4 LT |
21 | struct shmem_inode_info { |
22 | spinlock_t lock; | |
23 | unsigned long flags; | |
24 | unsigned long alloced; /* data pages alloced to file */ | |
25 | unsigned long swapped; /* subtotal assigned to swap */ | |
26 | unsigned long next_index; /* highest alloced index + 1 */ | |
27 | struct shared_policy policy; /* NUMA memory alloc policy */ | |
28 | struct page *i_indirect; /* top indirect blocks page */ | |
b09e0fa4 EP |
29 | union { |
30 | swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */ | |
31 | char inline_symlink[SHMEM_SYMLINK_INLINE_LEN]; | |
32 | }; | |
1da177e4 | 33 | struct list_head swaplist; /* chain of maybes on swap */ |
b09e0fa4 | 34 | struct list_head xattr_list; /* list of shmem_xattr */ |
1da177e4 LT |
35 | struct inode vfs_inode; |
36 | }; | |
37 | ||
38 | struct shmem_sb_info { | |
39 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 40 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
41 | unsigned long max_inodes; /* How many inodes are allowed */ |
42 | unsigned long free_inodes; /* How many are left for allocation */ | |
680d794b AM |
43 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
44 | uid_t uid; /* Mount uid for root directory */ | |
45 | gid_t gid; /* Mount gid for root directory */ | |
46 | mode_t mode; /* Mount mode for root directory */ | |
71fe804b | 47 | struct mempolicy *mpol; /* default memory policy for mappings */ |
1da177e4 LT |
48 | }; |
49 | ||
50 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) | |
51 | { | |
52 | return container_of(inode, struct shmem_inode_info, vfs_inode); | |
53 | } | |
54 | ||
072441e2 HD |
55 | /* |
56 | * Functions in mm/shmem.c called directly from elsewhere: | |
57 | */ | |
2b2af54a KS |
58 | extern int init_tmpfs(void); |
59 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); | |
072441e2 HD |
60 | extern struct file *shmem_file_setup(const char *name, |
61 | loff_t size, unsigned long flags); | |
62 | extern int shmem_zero_setup(struct vm_area_struct *); | |
63 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); | |
94c1e62d | 64 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
072441e2 HD |
65 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
66 | extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff, | |
67 | struct page **pagep, swp_entry_t *ent); | |
2b2af54a | 68 | |
1da177e4 | 69 | #endif |