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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __SHMEM_FS_H
2#define __SHMEM_FS_H
3
David Herrmann40e041a2014-08-08 14:25:27 -07004#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/swap.h>
6#include <linux/mempolicy.h>
Hugh Dickinsd9d90e52011-06-27 16:18:04 -07007#include <linux/pagemap.h>
Tim Chen7e496292010-08-09 17:19:05 -07008#include <linux/percpu_counter.h>
Aristeu Rozanski38f38652012-08-23 16:53:28 -04009#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11/* inode in-kernel data */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013struct shmem_inode_info {
14 spinlock_t lock;
David Herrmann40e041a2014-08-08 14:25:27 -070015 unsigned int seals; /* shmem seals */
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 unsigned long flags;
17 unsigned long alloced; /* data pages alloced to file */
Al Viro3ed47db2016-01-22 18:08:52 -050018 unsigned long swapped; /* subtotal assigned to swap */
Hugh Dickins69f07ec2011-08-03 16:21:26 -070019 struct shared_policy policy; /* NUMA memory alloc policy */
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 struct list_head swaplist; /* chain of maybes on swap */
Aristeu Rozanski38f38652012-08-23 16:53:28 -040021 struct simple_xattrs xattrs; /* list of xattrs */
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 struct inode vfs_inode;
23};
24
25struct shmem_sb_info {
26 unsigned long max_blocks; /* How many blocks are allowed */
Tim Chen7e496292010-08-09 17:19:05 -070027 struct percpu_counter used_blocks; /* How many are allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 unsigned long max_inodes; /* How many inodes are allowed */
29 unsigned long free_inodes; /* How many are left for allocation */
akpm@linux-foundation.org680d7942008-02-08 04:21:48 -080030 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
Eric W. Biederman8751e032012-02-07 16:46:12 -080031 kuid_t uid; /* Mount uid for root directory */
32 kgid_t gid; /* Mount gid for root directory */
Al Viro09208d12011-07-26 03:15:03 -040033 umode_t mode; /* Mount mode for root directory */
Lee Schermerhorn71fe8042008-04-28 02:13:26 -070034 struct mempolicy *mpol; /* default memory policy for mappings */
Linus Torvalds1da177e2005-04-16 15:20:36 -070035};
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
Hugh Dickins072441e2011-06-27 16:18:02 -070042/*
43 * Functions in mm/shmem.c called directly from elsewhere:
44 */
Hugh Dickins41ffe5d2011-08-03 16:21:21 -070045extern int shmem_init(void);
Kay Sievers2b2af542009-04-30 15:23:42 +020046extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
Hugh Dickins072441e2011-06-27 16:18:02 -070047extern struct file *shmem_file_setup(const char *name,
48 loff_t size, unsigned long flags);
Eric Parisc7277092013-12-02 11:24:19 +000049extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
50 unsigned long flags);
Hugh Dickins072441e2011-06-27 16:18:02 -070051extern int shmem_zero_setup(struct vm_area_struct *);
52extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
Johannes Weiner0cd61442014-04-03 14:47:46 -070053extern bool shmem_mapping(struct address_space *mapping);
Hugh Dickins24513262012-01-20 14:34:21 -080054extern void shmem_unlock_mapping(struct address_space *mapping);
Hugh Dickinsd9d90e52011-06-27 16:18:04 -070055extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
56 pgoff_t index, gfp_t gfp_mask);
Hugh Dickins94c1e622011-06-27 16:18:03 -070057extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
Hugh Dickins072441e2011-06-27 16:18:02 -070058extern int shmem_unuse(swp_entry_t entry, struct page *page);
Kay Sievers2b2af542009-04-30 15:23:42 +020059
Vlastimil Babka6a15a372016-01-14 15:19:20 -080060extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
Vlastimil Babka48131e02016-01-14 15:19:23 -080061extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
62 pgoff_t start, pgoff_t end);
Vlastimil Babka6a15a372016-01-14 15:19:20 -080063
Hugh Dickinsd9d90e52011-06-27 16:18:04 -070064static 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
David Herrmann40e041a2014-08-08 14:25:27 -070071#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#endif