4 #include <linux/swap.h>
5 #include <linux/mempolicy.h>
6 #include <linux/percpu_counter.h>
13 struct vm_area_struct;
15 /* inode in-kernel data */
17 #define SHMEM_NR_DIRECT 16
19 #define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t))
21 struct shmem_inode_info {
24 unsigned long alloced; /* data pages alloced to file */
25 unsigned long swapped; /* subtotal assigned to swap */
26 unsigned long next_index; /* highest alloced index + 1 */
27 struct shared_policy policy; /* NUMA memory alloc policy */
28 struct page *i_indirect; /* top indirect blocks page */
30 swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
31 char inline_symlink[SHMEM_SYMLINK_INLINE_LEN];
33 struct list_head swaplist; /* chain of maybes on swap */
34 struct list_head xattr_list; /* list of shmem_xattr */
35 struct inode vfs_inode;
38 struct shmem_sb_info {
39 unsigned long max_blocks; /* How many blocks are allowed */
40 struct percpu_counter used_blocks; /* How many are allocated */
41 unsigned long max_inodes; /* How many inodes are allowed */
42 unsigned long free_inodes; /* How many are left for allocation */
43 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
44 uid_t uid; /* Mount uid for root directory */
45 gid_t gid; /* Mount gid for root directory */
46 mode_t mode; /* Mount mode for root directory */
47 struct mempolicy *mpol; /* default memory policy for mappings */
50 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
52 return container_of(inode, struct shmem_inode_info, vfs_inode);
56 * Functions in mm/shmem.c called directly from elsewhere:
58 extern int init_tmpfs(void);
59 extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
60 extern struct file *shmem_file_setup(const char *name,
61 loff_t size, unsigned long flags);
62 extern int shmem_zero_setup(struct vm_area_struct *);
63 extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
64 extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
65 extern int shmem_unuse(swp_entry_t entry, struct page *page);
66 extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
67 struct page **pagep, swp_entry_t *ent);