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1 | #ifndef __SHMEM_FS_H |
2 | #define __SHMEM_FS_H |
3 | |
4 | #include <linux/swap.h> |
5 | #include <linux/mempolicy.h> |
6 | #include <linux/pagemap.h> |
7 | #include <linux/percpu_counter.h> |
8 | #include <linux/xattr.h> |
9 | |
10 | /* inode in-kernel data */ |
11 | |
12 | struct shmem_inode_info { |
13 | spinlock_t lock; |
14 | unsigned long flags; |
15 | unsigned long alloced; /* data pages alloced to file */ |
16 | union { |
17 | unsigned long swapped; /* subtotal assigned to swap */ |
18 | char *symlink; /* unswappable short symlink */ |
19 | }; |
20 | struct shared_policy policy; /* NUMA memory alloc policy */ |
21 | struct list_head swaplist; /* chain of maybes on swap */ |
22 | struct simple_xattrs xattrs; /* list of xattrs */ |
23 | struct inode vfs_inode; |
24 | }; |
25 | |
26 | struct shmem_sb_info { |
27 | unsigned long max_blocks; /* How many blocks are allowed */ |
28 | struct percpu_counter used_blocks; /* How many are allocated */ |
29 | unsigned long max_inodes; /* How many inodes are allowed */ |
30 | unsigned long free_inodes; /* How many are left for allocation */ |
31 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
32 | kuid_t uid; /* Mount uid for root directory */ |
33 | kgid_t gid; /* Mount gid for root directory */ |
34 | umode_t mode; /* Mount mode for root directory */ |
35 | struct mempolicy *mpol; /* default memory policy for mappings */ |
36 | }; |
37 | |
38 | static 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 | /* |
44 | * Functions in mm/shmem.c called directly from elsewhere: |
45 | */ |
46 | extern int shmem_init(void); |
47 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
48 | extern struct file *shmem_file_setup(const char *name, |
49 | loff_t size, unsigned long flags); |
50 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
51 | unsigned long flags); |
52 | extern int shmem_zero_setup(struct vm_area_struct *); |
53 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
54 | extern void shmem_unlock_mapping(struct address_space *mapping); |
55 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
56 | pgoff_t index, gfp_t gfp_mask); |
57 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
58 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
59 | |
60 | static inline struct page *shmem_read_mapping_page( |
61 | struct address_space *mapping, pgoff_t index) |
62 | { |
63 | return shmem_read_mapping_page_gfp(mapping, index, |
64 | mapping_gfp_mask(mapping)); |
65 | } |
66 | |
67 | #endif |
68 |
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