4 #include <linux/file.h>
5 #include <linux/swap.h>
6 #include <linux/mempolicy.h>
7 #include <linux/pagemap.h>
8 #include <linux/percpu_counter.h>
9 #include <linux/xattr.h>
11 /* inode in-kernel data */
13 struct shmem_inode_info
{
15 unsigned int seals
; /* shmem seals */
17 unsigned long alloced
; /* data pages alloced to file */
19 unsigned long swapped
; /* subtotal assigned to swap */
20 char *symlink
; /* unswappable short symlink */
22 struct shared_policy policy
; /* NUMA memory alloc policy */
23 struct list_head swaplist
; /* chain of maybes on swap */
24 struct simple_xattrs xattrs
; /* list of xattrs */
25 struct inode vfs_inode
;
28 struct shmem_sb_info
{
29 unsigned long max_blocks
; /* How many blocks are allowed */
30 struct percpu_counter used_blocks
; /* How many are allocated */
31 unsigned long max_inodes
; /* How many inodes are allowed */
32 unsigned long free_inodes
; /* How many are left for allocation */
33 spinlock_t stat_lock
; /* Serialize shmem_sb_info changes */
34 kuid_t uid
; /* Mount uid for root directory */
35 kgid_t gid
; /* Mount gid for root directory */
36 umode_t mode
; /* Mount mode for root directory */
37 struct mempolicy
*mpol
; /* default memory policy for mappings */
40 static inline struct shmem_inode_info
*SHMEM_I(struct inode
*inode
)
42 return container_of(inode
, struct shmem_inode_info
, vfs_inode
);
46 * Functions in mm/shmem.c called directly from elsewhere:
48 extern int shmem_init(void);
49 extern int shmem_fill_super(struct super_block
*sb
, void *data
, int silent
);
50 extern struct file
*shmem_file_setup(const char *name
,
51 loff_t size
, unsigned long flags
);
52 extern struct file
*shmem_kernel_file_setup(const char *name
, loff_t size
,
54 extern int shmem_zero_setup(struct vm_area_struct
*);
55 extern int shmem_lock(struct file
*file
, int lock
, struct user_struct
*user
);
56 extern bool shmem_mapping(struct address_space
*mapping
);
57 extern void shmem_unlock_mapping(struct address_space
*mapping
);
58 extern struct page
*shmem_read_mapping_page_gfp(struct address_space
*mapping
,
59 pgoff_t index
, gfp_t gfp_mask
);
60 extern void shmem_truncate_range(struct inode
*inode
, loff_t start
, loff_t end
);
61 extern int shmem_unuse(swp_entry_t entry
, struct page
*page
);
63 static inline struct page
*shmem_read_mapping_page(
64 struct address_space
*mapping
, pgoff_t index
)
66 return shmem_read_mapping_page_gfp(mapping
, index
,
67 mapping_gfp_mask(mapping
));
72 extern int shmem_add_seals(struct file
*file
, unsigned int seals
);
73 extern int shmem_get_seals(struct file
*file
);
74 extern long shmem_fcntl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
78 static inline long shmem_fcntl(struct file
*f
, unsigned int c
, unsigned long a
)