[deliverable/linux.git] / include / linux / shmem_fs.h

#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H

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

/* inode in-kernel data */

#define SHMEM_NR_DIRECT 16

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 */
	swp_entry_t		i_direct[SHMEM_NR_DIRECT]; /* first blocks */
	struct list_head	swaplist;	/* chain of maybes on swap */
	struct inode		vfs_inode;
};

struct shmem_sb_info {
	unsigned long max_blocks;   /* How many blocks are allowed */
	unsigned long free_blocks;  /* How many are left for allocation */
	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);
}

extern int init_tmpfs(void);
extern int shmem_fill_super(struct super_block *sb, void *data, int silent);

#ifdef CONFIG_TMPFS_POSIX_ACL
int shmem_check_acl(struct inode *, int);
int shmem_acl_init(struct inode *, struct inode *);

extern struct xattr_handler shmem_xattr_acl_access_handler;
extern struct xattr_handler shmem_xattr_acl_default_handler;

extern struct generic_acl_operations shmem_acl_ops;

#else
static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
{
	return 0;
}
#endif  /* CONFIG_TMPFS_POSIX_ACL */

#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>
	6
	7	/* inode in-kernel data */
	8
	9	#define SHMEM_NR_DIRECT 16
	10
	11	struct shmem_inode_info {
	12	spinlock_t lock;
	13	unsigned long flags;
	14	unsigned long alloced; /* data pages alloced to file */
	15	unsigned long swapped; /* subtotal assigned to swap */
	16	unsigned long next_index; /* highest alloced index + 1 */
	17	struct shared_policy policy; /* NUMA memory alloc policy */
	18	struct page i_indirect; / top indirect blocks page */
	19	swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
	20	struct list_head swaplist; /* chain of maybes on swap */
	21	struct inode vfs_inode;
	22	};
	23
	24	struct shmem_sb_info {
	25	unsigned long max_blocks; /* How many blocks are allowed */
	26	unsigned long free_blocks; /* How many are left for allocation */
	27	unsigned long max_inodes; /* How many inodes are allowed */
	28	unsigned long free_inodes; /* How many are left for allocation */
680d794b	29	spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
	30	uid_t uid; /* Mount uid for root directory */
	31	gid_t gid; /* Mount gid for root directory */
	32	mode_t mode; /* Mount mode for root directory */
71fe804b	33	struct mempolicy mpol; / default memory policy for mappings */
1da177e4 LT	34	};
	35
	36	static inline struct shmem_inode_info SHMEM_I(struct inode inode)
	37	{
	38	return container_of(inode, struct shmem_inode_info, vfs_inode);
	39	}
	40
2b2af54a KS	41	extern int init_tmpfs(void);
	42	extern int shmem_fill_super(struct super_block sb, void data, int silent);
	43
39f0247d	44	#ifdef CONFIG_TMPFS_POSIX_ACL
6d848a48	45	int shmem_check_acl(struct inode *, int);
39f0247d	46	int shmem_acl_init(struct inode , struct inode );
39f0247d AG	47
	48	extern struct xattr_handler shmem_xattr_acl_access_handler;
	49	extern struct xattr_handler shmem_xattr_acl_default_handler;
	50
	51	extern struct generic_acl_operations shmem_acl_ops;
	52
	53	#else
	54	static inline int shmem_acl_init(struct inode inode, struct inode dir)
	55	{
	56	return 0;
	57	}
39f0247d AG	58	#endif /* CONFIG_TMPFS_POSIX_ACL */
39f0247d AG	59
1da177e4	60	#endif