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> |
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 */ |
d144bf62 | 21 | pgoff_t fallocend; /* highest fallocate endindex */ |
779750d2 | 22 | struct list_head shrinklist; /* shrinkable hpage inodes */ |
1da177e4 | 23 | struct list_head swaplist; /* chain of maybes on swap */ |
779750d2 | 24 | struct shared_policy policy; /* NUMA memory alloc policy */ |
38f38657 | 25 | struct simple_xattrs xattrs; /* list of xattrs */ |
af53d3e9 | 26 | atomic_t stop_eviction; /* hold when working on inode */ |
f7cd16a5 | 27 | struct timespec64 i_crtime; /* file creation time */ |
e408e695 | 28 | unsigned int fsflags; /* flags for FS_IOC_[SG]ETFLAGS */ |
1da177e4 LT |
29 | struct inode vfs_inode; |
30 | }; | |
31 | ||
cb241339 HD |
32 | #define SHMEM_FL_USER_VISIBLE FS_FL_USER_VISIBLE |
33 | #define SHMEM_FL_USER_MODIFIABLE \ | |
34 | (FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL) | |
35 | #define SHMEM_FL_INHERITED (FS_NODUMP_FL | FS_NOATIME_FL) | |
e408e695 | 36 | |
1da177e4 LT |
37 | struct shmem_sb_info { |
38 | unsigned long max_blocks; /* How many blocks are allowed */ | |
7e496299 | 39 | struct percpu_counter used_blocks; /* How many are allocated */ |
1da177e4 LT |
40 | unsigned long max_inodes; /* How many inodes are allowed */ |
41 | unsigned long free_inodes; /* How many are left for allocation */ | |
bf11b9a8 | 42 | raw_spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
5a6e75f8 KS |
43 | umode_t mode; /* Mount mode for root directory */ |
44 | unsigned char huge; /* Whether to try for hugepages */ | |
8751e039 EB |
45 | kuid_t uid; /* Mount uid for root directory */ |
46 | kgid_t gid; /* Mount gid for root directory */ | |
ea3271f7 | 47 | bool full_inums; /* If i_ino should be uint or ino_t */ |
e809d5f0 CD |
48 | ino_t next_ino; /* The next per-sb inode number to use */ |
49 | ino_t __percpu *ino_batch; /* The next per-cpu inode number to use */ | |
71fe804b | 50 | struct mempolicy *mpol; /* default memory policy for mappings */ |
779750d2 KS |
51 | spinlock_t shrinklist_lock; /* Protects shrinklist */ |
52 | struct list_head shrinklist; /* List of shinkable inodes */ | |
53 | unsigned long shrinklist_len; /* Length of shrinklist */ | |
1da177e4 LT |
54 | }; |
55 | ||
56 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) | |
57 | { | |
58 | return container_of(inode, struct shmem_inode_info, vfs_inode); | |
59 | } | |
60 | ||
072441e2 HD |
61 | /* |
62 | * Functions in mm/shmem.c called directly from elsewhere: | |
63 | */ | |
d7167b14 | 64 | extern const struct fs_parameter_spec shmem_fs_parameters[]; |
9096bbe9 | 65 | extern void shmem_init(void); |
f3235626 | 66 | extern int shmem_init_fs_context(struct fs_context *fc); |
072441e2 HD |
67 | extern struct file *shmem_file_setup(const char *name, |
68 | loff_t size, unsigned long flags); | |
c7277090 EP |
69 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
70 | unsigned long flags); | |
703321b6 MA |
71 | extern struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt, |
72 | const char *name, loff_t size, unsigned long flags); | |
072441e2 | 73 | extern int shmem_zero_setup(struct vm_area_struct *); |
c01d5b30 HD |
74 | extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr, |
75 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
d7c9e99a | 76 | extern int shmem_lock(struct file *file, int lock, struct ucounts *ucounts); |
3a4f8a0b | 77 | #ifdef CONFIG_SHMEM |
30e6a51d HS |
78 | extern const struct address_space_operations shmem_aops; |
79 | static inline bool shmem_mapping(struct address_space *mapping) | |
80 | { | |
81 | return mapping->a_ops == &shmem_aops; | |
82 | } | |
3a4f8a0b HD |
83 | #else |
84 | static inline bool shmem_mapping(struct address_space *mapping) | |
85 | { | |
86 | return false; | |
87 | } | |
88 | #endif /* CONFIG_SHMEM */ | |
24513264 | 89 | extern void shmem_unlock_mapping(struct address_space *mapping); |
d9d90e5e HD |
90 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
91 | pgoff_t index, gfp_t gfp_mask); | |
94c1e62d | 92 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
10a9c496 | 93 | int shmem_unuse(unsigned int type); |
2b2af54a | 94 | |
7c6c6cc4 ZK |
95 | extern bool shmem_is_huge(struct vm_area_struct *vma, struct inode *inode, |
96 | pgoff_t index, bool shmem_huge_force); | |
97 | static inline bool shmem_huge_enabled(struct vm_area_struct *vma, | |
98 | bool shmem_huge_force) | |
5e6e5a12 | 99 | { |
7c6c6cc4 ZK |
100 | return shmem_is_huge(vma, file_inode(vma->vm_file), vma->vm_pgoff, |
101 | shmem_huge_force); | |
5e6e5a12 | 102 | } |
6a15a370 | 103 | extern unsigned long shmem_swap_usage(struct vm_area_struct *vma); |
48131e03 VB |
104 | extern unsigned long shmem_partial_swap_usage(struct address_space *mapping, |
105 | pgoff_t start, pgoff_t end); | |
6a15a370 | 106 | |
923e2f0e | 107 | /* Flag allocation requirements to shmem_get_folio */ |
f3f0e1d2 KS |
108 | enum sgp_type { |
109 | SGP_READ, /* don't exceed i_size, don't allocate page */ | |
acdd9f8e | 110 | SGP_NOALLOC, /* similar, but fail on hole or use fallocated page */ |
f3f0e1d2 | 111 | SGP_CACHE, /* don't exceed i_size, may allocate page */ |
f3f0e1d2 KS |
112 | SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */ |
113 | SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */ | |
114 | }; | |
115 | ||
4e1fc793 MWO |
116 | int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop, |
117 | enum sgp_type sgp); | |
f3f0e1d2 | 118 | |
d9d90e5e HD |
119 | static inline struct page *shmem_read_mapping_page( |
120 | struct address_space *mapping, pgoff_t index) | |
121 | { | |
122 | return shmem_read_mapping_page_gfp(mapping, index, | |
123 | mapping_gfp_mask(mapping)); | |
124 | } | |
125 | ||
f3f0e1d2 KS |
126 | static inline bool shmem_file(struct file *file) |
127 | { | |
128 | if (!IS_ENABLED(CONFIG_SHMEM)) | |
129 | return false; | |
130 | if (!file || !file->f_mapping) | |
131 | return false; | |
132 | return shmem_mapping(file->f_mapping); | |
133 | } | |
134 | ||
d144bf62 HD |
135 | /* |
136 | * If fallocate(FALLOC_FL_KEEP_SIZE) has been used, there may be pages | |
137 | * beyond i_size's notion of EOF, which fallocate has committed to reserving: | |
138 | * which split_huge_page() must therefore not delete. This use of a single | |
139 | * "fallocend" per inode errs on the side of not deleting a reservation when | |
140 | * in doubt: there are plenty of cases when it preserves unreserved pages. | |
141 | */ | |
142 | static inline pgoff_t shmem_fallocend(struct inode *inode, pgoff_t eof) | |
143 | { | |
144 | return max(eof, SHMEM_I(inode)->fallocend); | |
145 | } | |
146 | ||
800d8c63 KS |
147 | extern bool shmem_charge(struct inode *inode, long pages); |
148 | extern void shmem_uncharge(struct inode *inode, long pages); | |
149 | ||
3460f6e5 | 150 | #ifdef CONFIG_USERFAULTFD |
4c27fe4c | 151 | #ifdef CONFIG_SHMEM |
3460f6e5 | 152 | extern int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, |
4c27fe4c MR |
153 | struct vm_area_struct *dst_vma, |
154 | unsigned long dst_addr, | |
155 | unsigned long src_addr, | |
8ee79edf | 156 | bool zeropage, bool wp_copy, |
4c27fe4c | 157 | struct page **pagep); |
3460f6e5 AR |
158 | #else /* !CONFIG_SHMEM */ |
159 | #define shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, \ | |
8ee79edf | 160 | src_addr, zeropage, wp_copy, pagep) ({ BUG(); 0; }) |
3460f6e5 AR |
161 | #endif /* CONFIG_SHMEM */ |
162 | #endif /* CONFIG_USERFAULTFD */ | |
4c27fe4c | 163 | |
1da177e4 | 164 | #endif |