에프에이리눅스 / 1611_0007_prime_oven

Blame view

kernel/linux-imx6_3.14.28/include/linux/shmem_fs.h 2.41 KB
edit raw normal view history
6b13f685e   김민수   BSP 최초 추가 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
  #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>
  #include <linux/xattr.h>
  
  /* inode in-kernel data */
  
  struct shmem_inode_info {
  	spinlock_t		lock;
  	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 {
  	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 */
  	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);
  extern struct file *shmem_kernel_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 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));
  }
  
  #endif