1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
new file mode 100644
index 00000000..aa08fa8f
--- /dev/null
+++ b/include/linux/shmem_fs.h
@@ -0,0 +1,72 @@
+#ifndef __SHMEM_FS_H
+#define __SHMEM_FS_H
+
+#include <linux/swap.h>
+#include <linux/mempolicy.h>
+#include <linux/pagemap.h>
+#include <linux/percpu_counter.h>
+
+/* 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 struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
+					pgoff_t index, gfp_t gfp_mask);
+extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
+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);
+
+static inline struct page *shmem_read_mapping_page(
+				struct address_space *mapping, pgoff_t index)
+{
+	return shmem_read_mapping_page_gfp(mapping, index,
+					mapping_gfp_mask(mapping));
+}
+
+#endif