shmem_fs.h 3.23 KB
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#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H

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#include <linux/file.h>
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#include <linux/swap.h>
#include <linux/mempolicy.h>
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#include <linux/pagemap.h>
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#include <linux/percpu_counter.h>
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#include <linux/xattr.h>
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/* inode in-kernel data */

struct shmem_inode_info {
	spinlock_t		lock;
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	unsigned int		seals;		/* shmem seals */
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	unsigned long		flags;
	unsigned long		alloced;	/* data pages alloced to file */
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	unsigned long		swapped;	/* subtotal assigned to swap */
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	struct shared_policy	policy;		/* NUMA memory alloc policy */
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	struct list_head	swaplist;	/* chain of maybes on swap */
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	struct simple_xattrs	xattrs;		/* list of xattrs */
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	struct inode		vfs_inode;
};

struct shmem_sb_info {
	unsigned long max_blocks;   /* How many blocks are allowed */
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	struct percpu_counter used_blocks;  /* How many are allocated */
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	unsigned long max_inodes;   /* How many inodes are allowed */
	unsigned long free_inodes;  /* How many are left for allocation */
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	spinlock_t stat_lock;	    /* Serialize shmem_sb_info changes */
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	umode_t mode;		    /* Mount mode for root directory */
	unsigned char huge;	    /* Whether to try for hugepages */
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	kuid_t uid;		    /* Mount uid for root directory */
	kgid_t gid;		    /* Mount gid for root directory */
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	struct mempolicy *mpol;     /* default memory policy for mappings */
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};

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

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/*
 * Functions in mm/shmem.c called directly from elsewhere:
 */
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extern int shmem_init(void);
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extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
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extern struct file *shmem_file_setup(const char *name,
					loff_t size, unsigned long flags);
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extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
					    unsigned long flags);
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extern int shmem_zero_setup(struct vm_area_struct *);
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extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
		unsigned long len, unsigned long pgoff, unsigned long flags);
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extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
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extern bool shmem_mapping(struct address_space *mapping);
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extern void shmem_unlock_mapping(struct address_space *mapping);
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extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
					pgoff_t index, gfp_t gfp_mask);
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extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
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extern int shmem_unuse(swp_entry_t entry, struct page *page);
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extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
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extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
						pgoff_t start, pgoff_t end);
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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));
}

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extern bool shmem_charge(struct inode *inode, long pages);
extern void shmem_uncharge(struct inode *inode, long pages);

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#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

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#endif