1 files changed, 89 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
new file mode 100644
index 000000000..3ab7d1805
--- /dev/null
+++ b/include/linux/shmem_fs.h
@@ -0,0 +1,89 @@
+#ifndef __SHMEM_FS_H
+#define __SHMEM_FS_H
+
+#include <linux/file.h>
+#include <linux/swap.h>
+#include <linux/mempolicy.h>
+#include <linux/pagemap.h>
+#include <linux/percpu_counter.h>
+#include <linux/xattr.h>
+
+/* inode in-kernel data */
+
+struct shmem_inode_info {
+	spinlock_t		lock;
+	unsigned int		seals;		/* shmem seals */
+	unsigned long		flags;
+	unsigned long		alloced;	/* data pages alloced to file */
+	union {
+		unsigned long	swapped;	/* subtotal assigned to swap */
+		char		*symlink;	/* unswappable short symlink */
+	};
+	struct shared_policy	policy;		/* NUMA memory alloc policy */
+	struct list_head	swaplist;	/* chain of maybes on swap */
+	struct simple_xattrs	xattrs;		/* list of xattrs */
+	struct inode		vfs_inode;
+};
+
+struct shmem_sb_info {
+	struct mutex idr_lock;
+	bool idr_nouse;
+	struct idr idr;		    /* manages inode-number */
+	unsigned long max_blocks;   /* How many blocks are allowed */
+	struct percpu_counter used_blocks;  /* How many are allocated */
+	int max_inodes;		    /* How many inodes are allowed */
+	int free_inodes;	    /* How many are left for allocation */
+	spinlock_t stat_lock;	    /* Serialize shmem_sb_info changes */
+	kuid_t uid;		    /* Mount uid for root directory */
+	kgid_t gid;		    /* Mount gid for root directory */
+	umode_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 shmem_init(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,
+					int atomic_copy);
+extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
+					    unsigned long flags, int atomic_copy);
+extern int shmem_zero_setup(struct vm_area_struct *);
+extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
+extern bool shmem_mapping(struct address_space *mapping);
+extern void shmem_unlock_mapping(struct address_space *mapping);
+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);
+
+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));
+}
+
+#ifdef CONFIG_TMPFS
+
+extern int shmem_add_seals(struct file *file, unsigned int seals);
+extern int shmem_get_seals(struct file *file);
+extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg);
+
+#else
+
+static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a)
+{
+	return -EINVAL;
+}
+
+#endif
+
+#endif