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