[mirror_ubuntu-artful-kernel.git] / include / linux / shmem_fs.h

#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H

#include <linux/swap.h>
#include <linux/mempolicy.h>
#include <linux/percpu_counter.h>

struct page;
struct file;
struct inode;
struct super_block;
struct user_struct;
struct vm_area_struct;

/* inode in-kernel data */

#define SHMEM_NR_DIRECT 16

#define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t))

struct shmem_inode_info {
	spinlock_t		lock;
	unsigned long		flags;
	unsigned long		alloced;	/* data pages alloced to file */
	unsigned long		swapped;	/* subtotal assigned to swap */
	unsigned long		next_index;	/* highest alloced index + 1 */
	struct shared_policy	policy;		/* NUMA memory alloc policy */
	struct page		*i_indirect;	/* top indirect blocks page */
	union {
		swp_entry_t	i_direct[SHMEM_NR_DIRECT]; /* first blocks */
		char		inline_symlink[SHMEM_SYMLINK_INLINE_LEN];
	};
	struct list_head	swaplist;	/* chain of maybes on swap */
	struct list_head	xattr_list;	/* list of shmem_xattr */
	struct inode		vfs_inode;
};

struct shmem_sb_info {
	unsigned long max_blocks;   /* How many blocks are allowed */
	struct percpu_counter used_blocks;  /* How many are allocated */
	unsigned long max_inodes;   /* How many inodes are allowed */
	unsigned long free_inodes;  /* How many are left for allocation */
	spinlock_t stat_lock;	    /* Serialize shmem_sb_info changes */
	uid_t uid;		    /* Mount uid for root directory */
	gid_t gid;		    /* Mount gid for root directory */
	mode_t mode;		    /* Mount mode for root directory */
	struct mempolicy *mpol;     /* default memory policy for mappings */
};

static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
{
	return container_of(inode, struct shmem_inode_info, vfs_inode);
}

/*
 * Functions in mm/shmem.c called directly from elsewhere:
 */
extern int init_tmpfs(void);
extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
extern struct file *shmem_file_setup(const char *name,
					loff_t size, unsigned long flags);
extern int shmem_zero_setup(struct vm_area_struct *);
extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
extern int shmem_unuse(swp_entry_t entry, struct page *page);
extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
					struct page **pagep, swp_entry_t *ent);

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __SHMEM_FS_H
	2	#define __SHMEM_FS_H
	3
	4	#include <linux/swap.h>
	5	#include <linux/mempolicy.h>
7e496299	6	#include <linux/percpu_counter.h>
1da177e4	7
072441e2 HD	8	struct page;
	9	struct file;
	10	struct inode;
	11	struct super_block;
	12	struct user_struct;
	13	struct vm_area_struct;
	14
1da177e4 LT	15	/* inode in-kernel data */
	16
	17	#define SHMEM_NR_DIRECT 16
	18
b09e0fa4 EP	19	#define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t))
b09e0fa4 EP	20
1da177e4 LT	21	struct shmem_inode_info {
	22	spinlock_t lock;
	23	unsigned long flags;
	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 */
b09e0fa4 EP	29	union {
	30	swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
	31	char inline_symlink[SHMEM_SYMLINK_INLINE_LEN];
	32	};
1da177e4	33	struct list_head swaplist; /* chain of maybes on swap */
b09e0fa4	34	struct list_head xattr_list; /* list of shmem_xattr */
1da177e4 LT	35	struct inode vfs_inode;
	36	};
	37
	38	struct shmem_sb_info {
	39	unsigned long max_blocks; /* How many blocks are allowed */
7e496299	40	struct percpu_counter used_blocks; /* How many are allocated */
1da177e4 LT	41	unsigned long max_inodes; /* How many inodes are allowed */
1da177e4 LT	42	unsigned long free_inodes; /* How many are left for allocation */
680d794b AM	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 */
71fe804b	47	struct mempolicy mpol; / default memory policy for mappings */
1da177e4 LT	48	};
	49
	50	static inline struct shmem_inode_info SHMEM_I(struct inode inode)
	51	{
	52	return container_of(inode, struct shmem_inode_info, vfs_inode);
	53	}
	54
072441e2 HD	55	/*
	56	* Functions in mm/shmem.c called directly from elsewhere:
	57	*/
2b2af54a KS	58	extern int init_tmpfs(void);
2b2af54a KS	59	extern int shmem_fill_super(struct super_block sb, void data, int silent);
072441e2 HD	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 int shmem_unuse(swp_entry_t entry, struct page *page);
	65	extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
	66	struct page *pagep, swp_entry_t ent);
2b2af54a	67
1da177e4	68	#endif