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Commit | Line | Data |
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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 */ | |
3ed47db3 | 18 | unsigned long swapped; /* subtotal assigned to swap */ |
69f07ec9 | 19 | struct shared_policy policy; /* NUMA memory alloc policy */ |
1da177e4 | 20 | struct list_head swaplist; /* chain of maybes on swap */ |
38f38657 | 21 | struct simple_xattrs xattrs; /* list of xattrs */ |
1da177e4 LT |
22 | struct inode vfs_inode; |
23 | }; | |
24 | ||
25 | struct shmem_sb_info { | |
26 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 27 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
28 | unsigned long max_inodes; /* How many inodes are allowed */ |
29 | unsigned long free_inodes; /* How many are left for allocation */ | |
680d794b | 30 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
5a6e75f8 KS |
31 | umode_t mode; /* Mount mode for root directory */ |
32 | unsigned char huge; /* Whether to try for hugepages */ | |
8751e039 EB |
33 | kuid_t uid; /* Mount uid for root directory */ |
34 | kgid_t gid; /* Mount gid for root directory */ | |
71fe804b | 35 | struct mempolicy *mpol; /* default memory policy for mappings */ |
1da177e4 LT |
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 | ||
072441e2 HD |
43 | /* |
44 | * Functions in mm/shmem.c called directly from elsewhere: | |
45 | */ | |
41ffe5d5 | 46 | extern int shmem_init(void); |
2b2af54a | 47 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
072441e2 HD |
48 | extern struct file *shmem_file_setup(const char *name, |
49 | loff_t size, unsigned long flags); | |
c7277090 EP |
50 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
51 | unsigned long flags); | |
072441e2 | 52 | extern int shmem_zero_setup(struct vm_area_struct *); |
c01d5b30 HD |
53 | extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr, |
54 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
072441e2 | 55 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
0cd6144a | 56 | extern bool shmem_mapping(struct address_space *mapping); |
f3f0e1d2 | 57 | extern bool shmem_huge_enabled(struct vm_area_struct *vma); |
24513264 | 58 | extern void shmem_unlock_mapping(struct address_space *mapping); |
d9d90e5e HD |
59 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
60 | pgoff_t index, gfp_t gfp_mask); | |
94c1e62d | 61 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
072441e2 | 62 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
2b2af54a | 63 | |
6a15a370 | 64 | extern unsigned long shmem_swap_usage(struct vm_area_struct *vma); |
48131e03 VB |
65 | extern unsigned long shmem_partial_swap_usage(struct address_space *mapping, |
66 | pgoff_t start, pgoff_t end); | |
6a15a370 | 67 | |
f3f0e1d2 KS |
68 | /* Flag allocation requirements to shmem_getpage */ |
69 | enum sgp_type { | |
70 | SGP_READ, /* don't exceed i_size, don't allocate page */ | |
71 | SGP_CACHE, /* don't exceed i_size, may allocate page */ | |
72 | SGP_NOHUGE, /* like SGP_CACHE, but no huge pages */ | |
73 | SGP_HUGE, /* like SGP_CACHE, huge pages preferred */ | |
74 | SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */ | |
75 | SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */ | |
76 | }; | |
77 | ||
78 | extern int shmem_getpage(struct inode *inode, pgoff_t index, | |
79 | struct page **pagep, enum sgp_type sgp); | |
80 | ||
d9d90e5e HD |
81 | static inline struct page *shmem_read_mapping_page( |
82 | struct address_space *mapping, pgoff_t index) | |
83 | { | |
84 | return shmem_read_mapping_page_gfp(mapping, index, | |
85 | mapping_gfp_mask(mapping)); | |
86 | } | |
87 | ||
f3f0e1d2 KS |
88 | static inline bool shmem_file(struct file *file) |
89 | { | |
90 | if (!IS_ENABLED(CONFIG_SHMEM)) | |
91 | return false; | |
92 | if (!file || !file->f_mapping) | |
93 | return false; | |
94 | return shmem_mapping(file->f_mapping); | |
95 | } | |
96 | ||
800d8c63 KS |
97 | extern bool shmem_charge(struct inode *inode, long pages); |
98 | extern void shmem_uncharge(struct inode *inode, long pages); | |
99 | ||
40e041a2 DH |
100 | #ifdef CONFIG_TMPFS |
101 | ||
102 | extern int shmem_add_seals(struct file *file, unsigned int seals); | |
103 | extern int shmem_get_seals(struct file *file); | |
104 | extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg); | |
105 | ||
106 | #else | |
107 | ||
108 | static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a) | |
109 | { | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | #endif | |
114 | ||
1da177e4 | 115 | #endif |