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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __SHMEM_FS_H
2#define __SHMEM_FS_H
3
4#include <linux/swap.h>
5#include <linux/mempolicy.h>
Hugh Dickinsd9d90e52011-06-27 16:18:04 -07006#include <linux/pagemap.h>
Tim Chen7e496292010-08-09 17:19:05 -07007#include <linux/percpu_counter.h>
Aristeu Rozanski38f38652012-08-23 16:53:28 -04008#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10/* inode in-kernel data */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012struct shmem_inode_info {
13 spinlock_t lock;
14 unsigned long flags;
15 unsigned long alloced; /* data pages alloced to file */
Eric Parisb09e0fa2011-05-24 17:12:39 -070016 union {
Hugh Dickins69f07ec2011-08-03 16:21:26 -070017 unsigned long swapped; /* subtotal assigned to swap */
18 char *symlink; /* unswappable short symlink */
Eric Parisb09e0fa2011-05-24 17:12:39 -070019 };
Hugh Dickins69f07ec2011-08-03 16:21:26 -070020 struct shared_policy policy; /* NUMA memory alloc policy */
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 struct list_head swaplist; /* chain of maybes on swap */
Aristeu Rozanski38f38652012-08-23 16:53:28 -040022 struct simple_xattrs xattrs; /* list of xattrs */
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 struct inode vfs_inode;
24};
25
26struct shmem_sb_info {
27 unsigned long max_blocks; /* How many blocks are allowed */
Tim Chen7e496292010-08-09 17:19:05 -070028 struct percpu_counter used_blocks; /* How many are allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 unsigned long max_inodes; /* How many inodes are allowed */
30 unsigned long free_inodes; /* How many are left for allocation */
akpm@linux-foundation.org680d7942008-02-08 04:21:48 -080031 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
Eric W. Biederman8751e032012-02-07 16:46:12 -080032 kuid_t uid; /* Mount uid for root directory */
33 kgid_t gid; /* Mount gid for root directory */
Al Viro09208d12011-07-26 03:15:03 -040034 umode_t mode; /* Mount mode for root directory */
Lee Schermerhorn71fe8042008-04-28 02:13:26 -070035 struct mempolicy *mpol; /* default memory policy for mappings */
Linus Torvalds1da177e2005-04-16 15:20:36 -070036};
37
38static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
39{
40 return container_of(inode, struct shmem_inode_info, vfs_inode);
41}
42
Hugh Dickins072441e2011-06-27 16:18:02 -070043/*
44 * Functions in mm/shmem.c called directly from elsewhere:
45 */
Hugh Dickins41ffe5d2011-08-03 16:21:21 -070046extern int shmem_init(void);
Kay Sievers2b2af542009-04-30 15:23:42 +020047extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
Hugh Dickins072441e2011-06-27 16:18:02 -070048extern struct file *shmem_file_setup(const char *name,
49 loff_t size, unsigned long flags);
Eric Parisc7277092013-12-02 11:24:19 +000050extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
51 unsigned long flags);
Hugh Dickins072441e2011-06-27 16:18:02 -070052extern int shmem_zero_setup(struct vm_area_struct *);
53extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
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
Hugh Dickinsd9d90e52011-06-27 16:18:04 -070060static inline struct page *shmem_read_mapping_page(
61 struct address_space *mapping, pgoff_t index)
62{
63 return shmem_read_mapping_page_gfp(mapping, index,
64 mapping_gfp_mask(mapping));
65}
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#endif