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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __SHMEM_FS_H |
3 | #define __SHMEM_FS_H | |
4 | ||
40e041a2 | 5 | #include <linux/file.h> |
1da177e4 LT |
6 | #include <linux/swap.h> |
7 | #include <linux/mempolicy.h> | |
d9d90e5e | 8 | #include <linux/pagemap.h> |
7e496299 | 9 | #include <linux/percpu_counter.h> |
38f38657 | 10 | #include <linux/xattr.h> |
1da177e4 LT |
11 | |
12 | /* inode in-kernel data */ | |
13 | ||
1da177e4 LT |
14 | struct shmem_inode_info { |
15 | spinlock_t lock; | |
40e041a2 | 16 | unsigned int seals; /* shmem seals */ |
1da177e4 LT |
17 | unsigned long flags; |
18 | unsigned long alloced; /* data pages alloced to file */ | |
3ed47db3 | 19 | unsigned long swapped; /* subtotal assigned to swap */ |
779750d2 | 20 | struct list_head shrinklist; /* shrinkable hpage inodes */ |
1da177e4 | 21 | struct list_head swaplist; /* chain of maybes on swap */ |
779750d2 | 22 | struct shared_policy policy; /* NUMA memory alloc policy */ |
38f38657 | 23 | struct simple_xattrs xattrs; /* list of xattrs */ |
1da177e4 LT |
24 | struct inode vfs_inode; |
25 | }; | |
26 | ||
27 | struct shmem_sb_info { | |
28 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 29 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
30 | unsigned long max_inodes; /* How many inodes are allowed */ |
31 | unsigned long free_inodes; /* How many are left for allocation */ | |
680d794b | 32 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
5a6e75f8 KS |
33 | umode_t mode; /* Mount mode for root directory */ |
34 | unsigned char huge; /* Whether to try for hugepages */ | |
8751e039 EB |
35 | kuid_t uid; /* Mount uid for root directory */ |
36 | kgid_t gid; /* Mount gid for root directory */ | |
71fe804b | 37 | struct mempolicy *mpol; /* default memory policy for mappings */ |
779750d2 KS |
38 | spinlock_t shrinklist_lock; /* Protects shrinklist */ |
39 | struct list_head shrinklist; /* List of shinkable inodes */ | |
40 | unsigned long shrinklist_len; /* Length of shrinklist */ | |
1da177e4 LT |
41 | }; |
42 | ||
43 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) | |
44 | { | |
45 | return container_of(inode, struct shmem_inode_info, vfs_inode); | |
46 | } | |
47 | ||
072441e2 HD |
48 | /* |
49 | * Functions in mm/shmem.c called directly from elsewhere: | |
50 | */ | |
41ffe5d5 | 51 | extern int shmem_init(void); |
2b2af54a | 52 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
072441e2 HD |
53 | extern struct file *shmem_file_setup(const char *name, |
54 | loff_t size, unsigned long flags); | |
c7277090 EP |
55 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
56 | unsigned long flags); | |
072441e2 | 57 | extern int shmem_zero_setup(struct vm_area_struct *); |
c01d5b30 HD |
58 | extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr, |
59 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
072441e2 | 60 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
3a4f8a0b | 61 | #ifdef CONFIG_SHMEM |
0cd6144a | 62 | extern bool shmem_mapping(struct address_space *mapping); |
3a4f8a0b HD |
63 | #else |
64 | static inline bool shmem_mapping(struct address_space *mapping) | |
65 | { | |
66 | return false; | |
67 | } | |
68 | #endif /* CONFIG_SHMEM */ | |
24513264 | 69 | extern void shmem_unlock_mapping(struct address_space *mapping); |
d9d90e5e HD |
70 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
71 | pgoff_t index, gfp_t gfp_mask); | |
94c1e62d | 72 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
072441e2 | 73 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
2b2af54a | 74 | |
6a15a370 | 75 | extern unsigned long shmem_swap_usage(struct vm_area_struct *vma); |
48131e03 VB |
76 | extern unsigned long shmem_partial_swap_usage(struct address_space *mapping, |
77 | pgoff_t start, pgoff_t end); | |
6a15a370 | 78 | |
f3f0e1d2 KS |
79 | /* Flag allocation requirements to shmem_getpage */ |
80 | enum sgp_type { | |
81 | SGP_READ, /* don't exceed i_size, don't allocate page */ | |
82 | SGP_CACHE, /* don't exceed i_size, may allocate page */ | |
83 | SGP_NOHUGE, /* like SGP_CACHE, but no huge pages */ | |
84 | SGP_HUGE, /* like SGP_CACHE, huge pages preferred */ | |
85 | SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */ | |
86 | SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */ | |
87 | }; | |
88 | ||
89 | extern int shmem_getpage(struct inode *inode, pgoff_t index, | |
90 | struct page **pagep, enum sgp_type sgp); | |
91 | ||
d9d90e5e HD |
92 | static inline struct page *shmem_read_mapping_page( |
93 | struct address_space *mapping, pgoff_t index) | |
94 | { | |
95 | return shmem_read_mapping_page_gfp(mapping, index, | |
96 | mapping_gfp_mask(mapping)); | |
97 | } | |
98 | ||
f3f0e1d2 KS |
99 | static inline bool shmem_file(struct file *file) |
100 | { | |
101 | if (!IS_ENABLED(CONFIG_SHMEM)) | |
102 | return false; | |
103 | if (!file || !file->f_mapping) | |
104 | return false; | |
105 | return shmem_mapping(file->f_mapping); | |
106 | } | |
107 | ||
800d8c63 KS |
108 | extern bool shmem_charge(struct inode *inode, long pages); |
109 | extern void shmem_uncharge(struct inode *inode, long pages); | |
110 | ||
40e041a2 DH |
111 | #ifdef CONFIG_TMPFS |
112 | ||
113 | extern int shmem_add_seals(struct file *file, unsigned int seals); | |
114 | extern int shmem_get_seals(struct file *file); | |
115 | extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg); | |
116 | ||
117 | #else | |
118 | ||
119 | static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a) | |
120 | { | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | #endif | |
125 | ||
e496cf3d KS |
126 | #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE |
127 | extern bool shmem_huge_enabled(struct vm_area_struct *vma); | |
128 | #else | |
129 | static inline bool shmem_huge_enabled(struct vm_area_struct *vma) | |
130 | { | |
131 | return false; | |
132 | } | |
133 | #endif | |
134 | ||
4c27fe4c MR |
135 | #ifdef CONFIG_SHMEM |
136 | extern int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, | |
137 | struct vm_area_struct *dst_vma, | |
138 | unsigned long dst_addr, | |
139 | unsigned long src_addr, | |
140 | struct page **pagep); | |
8d103963 MR |
141 | extern int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm, |
142 | pmd_t *dst_pmd, | |
143 | struct vm_area_struct *dst_vma, | |
144 | unsigned long dst_addr); | |
4c27fe4c MR |
145 | #else |
146 | #define shmem_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \ | |
147 | src_addr, pagep) ({ BUG(); 0; }) | |
8d103963 MR |
148 | #define shmem_mfill_zeropage_pte(dst_mm, dst_pmd, dst_vma, \ |
149 | dst_addr) ({ BUG(); 0; }) | |
4c27fe4c MR |
150 | #endif |
151 | ||
1da177e4 | 152 | #endif |