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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> |
d7167b14 | 11 | #include <linux/fs_parser.h> |
1da177e4 LT |
12 | |
13 | /* inode in-kernel data */ | |
14 | ||
1da177e4 LT |
15 | struct shmem_inode_info { |
16 | spinlock_t lock; | |
40e041a2 | 17 | unsigned int seals; /* shmem seals */ |
1da177e4 LT |
18 | unsigned long flags; |
19 | unsigned long alloced; /* data pages alloced to file */ | |
3ed47db3 | 20 | unsigned long swapped; /* subtotal assigned to swap */ |
779750d2 | 21 | struct list_head shrinklist; /* shrinkable hpage inodes */ |
1da177e4 | 22 | struct list_head swaplist; /* chain of maybes on swap */ |
779750d2 | 23 | struct shared_policy policy; /* NUMA memory alloc policy */ |
38f38657 | 24 | struct simple_xattrs xattrs; /* list of xattrs */ |
af53d3e9 | 25 | atomic_t stop_eviction; /* hold when working on inode */ |
1da177e4 LT |
26 | struct inode vfs_inode; |
27 | }; | |
28 | ||
29 | struct shmem_sb_info { | |
30 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 31 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
32 | unsigned long max_inodes; /* How many inodes are allowed */ |
33 | unsigned long free_inodes; /* How many are left for allocation */ | |
680d794b | 34 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
5a6e75f8 KS |
35 | umode_t mode; /* Mount mode for root directory */ |
36 | unsigned char huge; /* Whether to try for hugepages */ | |
8751e039 EB |
37 | kuid_t uid; /* Mount uid for root directory */ |
38 | kgid_t gid; /* Mount gid for root directory */ | |
71fe804b | 39 | struct mempolicy *mpol; /* default memory policy for mappings */ |
779750d2 KS |
40 | spinlock_t shrinklist_lock; /* Protects shrinklist */ |
41 | struct list_head shrinklist; /* List of shinkable inodes */ | |
42 | unsigned long shrinklist_len; /* Length of shrinklist */ | |
1da177e4 LT |
43 | }; |
44 | ||
45 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) | |
46 | { | |
47 | return container_of(inode, struct shmem_inode_info, vfs_inode); | |
48 | } | |
49 | ||
072441e2 HD |
50 | /* |
51 | * Functions in mm/shmem.c called directly from elsewhere: | |
52 | */ | |
d7167b14 | 53 | extern const struct fs_parameter_spec shmem_fs_parameters[]; |
41ffe5d5 | 54 | extern int shmem_init(void); |
f3235626 | 55 | extern int shmem_init_fs_context(struct fs_context *fc); |
072441e2 HD |
56 | extern struct file *shmem_file_setup(const char *name, |
57 | loff_t size, unsigned long flags); | |
c7277090 EP |
58 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
59 | unsigned long flags); | |
703321b6 MA |
60 | extern struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt, |
61 | const char *name, loff_t size, unsigned long flags); | |
072441e2 | 62 | extern int shmem_zero_setup(struct vm_area_struct *); |
c01d5b30 HD |
63 | extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr, |
64 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
072441e2 | 65 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
3a4f8a0b | 66 | #ifdef CONFIG_SHMEM |
0cd6144a | 67 | extern bool shmem_mapping(struct address_space *mapping); |
3a4f8a0b HD |
68 | #else |
69 | static inline bool shmem_mapping(struct address_space *mapping) | |
70 | { | |
71 | return false; | |
72 | } | |
73 | #endif /* CONFIG_SHMEM */ | |
24513264 | 74 | extern void shmem_unlock_mapping(struct address_space *mapping); |
d9d90e5e HD |
75 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
76 | pgoff_t index, gfp_t gfp_mask); | |
94c1e62d | 77 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
b56a2d8a VRP |
78 | extern int shmem_unuse(unsigned int type, bool frontswap, |
79 | unsigned long *fs_pages_to_unuse); | |
2b2af54a | 80 | |
396bcc52 | 81 | extern bool shmem_huge_enabled(struct vm_area_struct *vma); |
6a15a370 | 82 | extern unsigned long shmem_swap_usage(struct vm_area_struct *vma); |
48131e03 VB |
83 | extern unsigned long shmem_partial_swap_usage(struct address_space *mapping, |
84 | pgoff_t start, pgoff_t end); | |
6a15a370 | 85 | |
f3f0e1d2 KS |
86 | /* Flag allocation requirements to shmem_getpage */ |
87 | enum sgp_type { | |
88 | SGP_READ, /* don't exceed i_size, don't allocate page */ | |
89 | SGP_CACHE, /* don't exceed i_size, may allocate page */ | |
90 | SGP_NOHUGE, /* like SGP_CACHE, but no huge pages */ | |
91 | SGP_HUGE, /* like SGP_CACHE, huge pages preferred */ | |
92 | SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */ | |
93 | SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */ | |
94 | }; | |
95 | ||
96 | extern int shmem_getpage(struct inode *inode, pgoff_t index, | |
97 | struct page **pagep, enum sgp_type sgp); | |
98 | ||
d9d90e5e HD |
99 | static inline struct page *shmem_read_mapping_page( |
100 | struct address_space *mapping, pgoff_t index) | |
101 | { | |
102 | return shmem_read_mapping_page_gfp(mapping, index, | |
103 | mapping_gfp_mask(mapping)); | |
104 | } | |
105 | ||
f3f0e1d2 KS |
106 | static inline bool shmem_file(struct file *file) |
107 | { | |
108 | if (!IS_ENABLED(CONFIG_SHMEM)) | |
109 | return false; | |
110 | if (!file || !file->f_mapping) | |
111 | return false; | |
112 | return shmem_mapping(file->f_mapping); | |
113 | } | |
114 | ||
800d8c63 KS |
115 | extern bool shmem_charge(struct inode *inode, long pages); |
116 | extern void shmem_uncharge(struct inode *inode, long pages); | |
117 | ||
4c27fe4c MR |
118 | #ifdef CONFIG_SHMEM |
119 | extern int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, | |
120 | struct vm_area_struct *dst_vma, | |
121 | unsigned long dst_addr, | |
122 | unsigned long src_addr, | |
123 | struct page **pagep); | |
8d103963 MR |
124 | extern int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm, |
125 | pmd_t *dst_pmd, | |
126 | struct vm_area_struct *dst_vma, | |
127 | unsigned long dst_addr); | |
4c27fe4c MR |
128 | #else |
129 | #define shmem_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \ | |
130 | src_addr, pagep) ({ BUG(); 0; }) | |
8d103963 MR |
131 | #define shmem_mfill_zeropage_pte(dst_mm, dst_pmd, dst_vma, \ |
132 | dst_addr) ({ BUG(); 0; }) | |
4c27fe4c MR |
133 | #endif |
134 | ||
1da177e4 | 135 | #endif |