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- #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>
- struct shmem_inode_info {
- spinlock_t lock;
- unsigned int seals;
- unsigned long flags;
- unsigned long alloced;
- unsigned long swapped;
- struct list_head shrinklist;
- struct list_head swaplist;
- struct shared_policy policy;
- struct simple_xattrs xattrs;
- struct inode vfs_inode;
- };
- struct shmem_sb_info {
- unsigned long max_blocks;
- struct percpu_counter used_blocks;
- unsigned long max_inodes;
- unsigned long free_inodes;
- spinlock_t stat_lock;
- umode_t mode;
- unsigned char huge;
- kuid_t uid;
- kgid_t gid;
- struct mempolicy *mpol;
- spinlock_t shrinklist_lock;
- struct list_head shrinklist;
- unsigned long shrinklist_len;
- };
- static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
- {
- return container_of(inode, struct shmem_inode_info, vfs_inode);
- }
- 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 unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags);
- 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);
- extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
- extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
- pgoff_t start, pgoff_t end);
- enum sgp_type {
- SGP_READ,
- SGP_CACHE,
- SGP_NOHUGE,
- SGP_HUGE,
- SGP_WRITE,
- SGP_FALLOC,
- };
- extern int shmem_getpage(struct inode *inode, pgoff_t index,
- struct page **pagep, enum sgp_type sgp);
- 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));
- }
- static inline bool shmem_file(struct file *file)
- {
- if (!IS_ENABLED(CONFIG_SHMEM))
- return false;
- if (!file || !file->f_mapping)
- return false;
- return shmem_mapping(file->f_mapping);
- }
- extern bool shmem_charge(struct inode *inode, long pages);
- extern void shmem_uncharge(struct inode *inode, long pages);
- #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
- #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
- extern bool shmem_huge_enabled(struct vm_area_struct *vma);
- #else
- static inline bool shmem_huge_enabled(struct vm_area_struct *vma)
- {
- return false;
- }
- #endif
- #endif
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