Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __SHMEM_FS_H |
2 | #define __SHMEM_FS_H | |
3 | ||
40e041a2 | 4 | #include <linux/file.h> |
1da177e4 LT |
5 | #include <linux/swap.h> |
6 | #include <linux/mempolicy.h> | |
d9d90e5e | 7 | #include <linux/pagemap.h> |
7e496299 | 8 | #include <linux/percpu_counter.h> |
38f38657 | 9 | #include <linux/xattr.h> |
1da177e4 LT |
10 | |
11 | /* inode in-kernel data */ | |
12 | ||
1da177e4 LT |
13 | struct shmem_inode_info { |
14 | spinlock_t lock; | |
40e041a2 | 15 | unsigned int seals; /* shmem seals */ |
1da177e4 LT |
16 | unsigned long flags; |
17 | unsigned long alloced; /* data pages alloced to file */ | |
b09e0fa4 | 18 | union { |
69f07ec9 HD |
19 | unsigned long swapped; /* subtotal assigned to swap */ |
20 | char *symlink; /* unswappable short symlink */ | |
b09e0fa4 | 21 | }; |
69f07ec9 | 22 | struct shared_policy policy; /* NUMA memory alloc policy */ |
1da177e4 | 23 | struct list_head swaplist; /* chain of maybes on swap */ |
38f38657 | 24 | struct simple_xattrs xattrs; /* list of xattrs */ |
1da177e4 LT |
25 | struct inode vfs_inode; |
26 | }; | |
27 | ||
28 | struct shmem_sb_info { | |
29 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 30 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
31 | unsigned long max_inodes; /* How many inodes are allowed */ |
32 | unsigned long free_inodes; /* How many are left for allocation */ | |
680d794b | 33 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
8751e039 EB |
34 | kuid_t uid; /* Mount uid for root directory */ |
35 | kgid_t gid; /* Mount gid for root directory */ | |
09208d15 | 36 | umode_t mode; /* Mount mode for root directory */ |
71fe804b | 37 | struct mempolicy *mpol; /* default memory policy for mappings */ |
1da177e4 LT |
38 | }; |
39 | ||
40 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) | |
41 | { | |
42 | return container_of(inode, struct shmem_inode_info, vfs_inode); | |
43 | } | |
44 | ||
072441e2 HD |
45 | /* |
46 | * Functions in mm/shmem.c called directly from elsewhere: | |
47 | */ | |
41ffe5d5 | 48 | extern int shmem_init(void); |
2b2af54a | 49 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
072441e2 HD |
50 | extern struct file *shmem_file_setup(const char *name, |
51 | loff_t size, unsigned long flags); | |
c7277090 EP |
52 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
53 | unsigned long flags); | |
072441e2 HD |
54 | extern int shmem_zero_setup(struct vm_area_struct *); |
55 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); | |
0cd6144a | 56 | extern bool shmem_mapping(struct address_space *mapping); |
24513264 | 57 | extern void shmem_unlock_mapping(struct address_space *mapping); |
d9d90e5e HD |
58 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
59 | pgoff_t index, gfp_t gfp_mask); | |
94c1e62d | 60 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
072441e2 | 61 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
2b2af54a | 62 | |
d9d90e5e HD |
63 | static inline struct page *shmem_read_mapping_page( |
64 | struct address_space *mapping, pgoff_t index) | |
65 | { | |
66 | return shmem_read_mapping_page_gfp(mapping, index, | |
67 | mapping_gfp_mask(mapping)); | |
68 | } | |
69 | ||
40e041a2 DH |
70 | #ifdef CONFIG_TMPFS |
71 | ||
72 | extern int shmem_add_seals(struct file *file, unsigned int seals); | |
73 | extern int shmem_get_seals(struct file *file); | |
74 | extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg); | |
75 | ||
76 | #else | |
77 | ||
78 | static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a) | |
79 | { | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | #endif | |
84 | ||
1da177e4 | 85 | #endif |