| 1 | #ifndef __SHMEM_FS_H |
| 2 | #define __SHMEM_FS_H |
| 3 | |
| 4 | #include <linux/swap.h> |
| 5 | #include <linux/mempolicy.h> |
| 6 | #include <linux/pagemap.h> |
| 7 | #include <linux/percpu_counter.h> |
| 8 | #include <linux/xattr.h> |
| 9 | |
| 10 | /* inode in-kernel data */ |
| 11 | |
| 12 | struct shmem_inode_info { |
| 13 | spinlock_t lock; |
| 14 | unsigned long flags; |
| 15 | unsigned long alloced; /* data pages alloced to file */ |
| 16 | union { |
| 17 | unsigned long swapped; /* subtotal assigned to swap */ |
| 18 | char *symlink; /* unswappable short symlink */ |
| 19 | }; |
| 20 | struct shared_policy policy; /* NUMA memory alloc policy */ |
| 21 | struct list_head swaplist; /* chain of maybes on swap */ |
| 22 | struct simple_xattrs xattrs; /* list of xattrs */ |
| 23 | struct inode vfs_inode; |
| 24 | }; |
| 25 | |
| 26 | struct shmem_sb_info { |
| 27 | unsigned long max_blocks; /* How many blocks are allowed */ |
| 28 | struct percpu_counter used_blocks; /* How many are allocated */ |
| 29 | unsigned long max_inodes; /* How many inodes are allowed */ |
| 30 | unsigned long free_inodes; /* How many are left for allocation */ |
| 31 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
| 32 | kuid_t uid; /* Mount uid for root directory */ |
| 33 | kgid_t gid; /* Mount gid for root directory */ |
| 34 | umode_t mode; /* Mount mode for root directory */ |
| 35 | struct mempolicy *mpol; /* default memory policy for mappings */ |
| 36 | }; |
| 37 | |
| 38 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) |
| 39 | { |
| 40 | return container_of(inode, struct shmem_inode_info, vfs_inode); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Functions in mm/shmem.c called directly from elsewhere: |
| 45 | */ |
| 46 | extern int shmem_init(void); |
| 47 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
| 48 | extern struct file *shmem_file_setup(const char *name, |
| 49 | loff_t size, unsigned long flags); |
| 50 | extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, |
| 51 | unsigned long flags); |
| 52 | extern int shmem_zero_setup(struct vm_area_struct *); |
| 53 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
| 54 | extern void shmem_unlock_mapping(struct address_space *mapping); |
| 55 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
| 56 | pgoff_t index, gfp_t gfp_mask); |
| 57 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
| 58 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
| 59 | |
| 60 | static inline struct page *shmem_read_mapping_page( |
| 61 | struct address_space *mapping, pgoff_t index) |
| 62 | { |
| 63 | return shmem_read_mapping_page_gfp(mapping, index, |
| 64 | mapping_gfp_mask(mapping)); |
| 65 | } |
| 66 | |
| 67 | #endif |