Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __SHMEM_FS_H |
| 2 | #define __SHMEM_FS_H |
| 3 | |
| 4 | #include <linux/swap.h> |
| 5 | #include <linux/mempolicy.h> |
Hugh Dickins | d9d90e5 | 2011-06-27 16:18:04 -0700 | [diff] [blame] | 6 | #include <linux/pagemap.h> |
Tim Chen | 7e49629 | 2010-08-09 17:19:05 -0700 | [diff] [blame] | 7 | #include <linux/percpu_counter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
| 9 | /* inode in-kernel data */ |
| 10 | |
| 11 | #define SHMEM_NR_DIRECT 16 |
| 12 | |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 13 | #define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t)) |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | struct shmem_inode_info { |
| 16 | spinlock_t lock; |
| 17 | unsigned long flags; |
| 18 | unsigned long alloced; /* data pages alloced to file */ |
| 19 | unsigned long swapped; /* subtotal assigned to swap */ |
| 20 | unsigned long next_index; /* highest alloced index + 1 */ |
| 21 | struct shared_policy policy; /* NUMA memory alloc policy */ |
| 22 | struct page *i_indirect; /* top indirect blocks page */ |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 23 | union { |
| 24 | swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */ |
| 25 | char inline_symlink[SHMEM_SYMLINK_INLINE_LEN]; |
| 26 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | struct list_head swaplist; /* chain of maybes on swap */ |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 28 | struct list_head xattr_list; /* list of shmem_xattr */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | struct inode vfs_inode; |
| 30 | }; |
| 31 | |
| 32 | struct shmem_sb_info { |
| 33 | unsigned long max_blocks; /* How many blocks are allowed */ |
Tim Chen | 7e49629 | 2010-08-09 17:19:05 -0700 | [diff] [blame] | 34 | struct percpu_counter used_blocks; /* How many are allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | unsigned long max_inodes; /* How many inodes are allowed */ |
| 36 | unsigned long free_inodes; /* How many are left for allocation */ |
akpm@linux-foundation.org | 680d794 | 2008-02-08 04:21:48 -0800 | [diff] [blame] | 37 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
| 38 | uid_t uid; /* Mount uid for root directory */ |
| 39 | gid_t gid; /* Mount gid for root directory */ |
| 40 | mode_t mode; /* Mount mode for root directory */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 41 | struct mempolicy *mpol; /* default memory policy for mappings */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | }; |
| 43 | |
| 44 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) |
| 45 | { |
| 46 | return container_of(inode, struct shmem_inode_info, vfs_inode); |
| 47 | } |
| 48 | |
Hugh Dickins | 072441e | 2011-06-27 16:18:02 -0700 | [diff] [blame] | 49 | /* |
| 50 | * Functions in mm/shmem.c called directly from elsewhere: |
| 51 | */ |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 52 | extern int init_tmpfs(void); |
| 53 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
Hugh Dickins | 072441e | 2011-06-27 16:18:02 -0700 | [diff] [blame] | 54 | extern struct file *shmem_file_setup(const char *name, |
| 55 | loff_t size, unsigned long flags); |
| 56 | extern int shmem_zero_setup(struct vm_area_struct *); |
| 57 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
Hugh Dickins | d9d90e5 | 2011-06-27 16:18:04 -0700 | [diff] [blame] | 58 | extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, |
| 59 | pgoff_t index, gfp_t gfp_mask); |
Hugh Dickins | 94c1e62 | 2011-06-27 16:18:03 -0700 | [diff] [blame] | 60 | extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end); |
Hugh Dickins | 072441e | 2011-06-27 16:18:02 -0700 | [diff] [blame] | 61 | extern int shmem_unuse(swp_entry_t entry, struct page *page); |
| 62 | extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff, |
| 63 | struct page **pagep, swp_entry_t *ent); |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 64 | |
Hugh Dickins | d9d90e5 | 2011-06-27 16:18:04 -0700 | [diff] [blame] | 65 | static inline struct page *shmem_read_mapping_page( |
| 66 | struct address_space *mapping, pgoff_t index) |
| 67 | { |
| 68 | return shmem_read_mapping_page_gfp(mapping, index, |
| 69 | mapping_gfp_mask(mapping)); |
| 70 | } |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #endif |