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> |
Tim Chen | 7e49629 | 2010-08-09 17:19:05 -0700 | [diff] [blame] | 6 | #include <linux/percpu_counter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | |
| 8 | /* inode in-kernel data */ |
| 9 | |
| 10 | #define SHMEM_NR_DIRECT 16 |
| 11 | |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 12 | #define SHMEM_SYMLINK_INLINE_LEN (SHMEM_NR_DIRECT * sizeof(swp_entry_t)) |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | struct shmem_inode_info { |
| 15 | spinlock_t lock; |
| 16 | unsigned long flags; |
| 17 | unsigned long alloced; /* data pages alloced to file */ |
| 18 | unsigned long swapped; /* subtotal assigned to swap */ |
| 19 | unsigned long next_index; /* highest alloced index + 1 */ |
| 20 | struct shared_policy policy; /* NUMA memory alloc policy */ |
| 21 | struct page *i_indirect; /* top indirect blocks page */ |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 22 | union { |
| 23 | swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */ |
| 24 | char inline_symlink[SHMEM_SYMLINK_INLINE_LEN]; |
| 25 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | struct list_head swaplist; /* chain of maybes on swap */ |
Eric Paris | b09e0fa | 2011-05-24 17:12:39 -0700 | [diff] [blame] | 27 | struct list_head xattr_list; /* list of shmem_xattr */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | struct inode vfs_inode; |
| 29 | }; |
| 30 | |
| 31 | struct shmem_sb_info { |
| 32 | unsigned long max_blocks; /* How many blocks are allowed */ |
Tim Chen | 7e49629 | 2010-08-09 17:19:05 -0700 | [diff] [blame] | 33 | struct percpu_counter used_blocks; /* How many are allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | unsigned long max_inodes; /* How many inodes are allowed */ |
| 35 | unsigned long free_inodes; /* How many are left for allocation */ |
akpm@linux-foundation.org | 680d794 | 2008-02-08 04:21:48 -0800 | [diff] [blame] | 36 | spinlock_t stat_lock; /* Serialize shmem_sb_info changes */ |
| 37 | uid_t uid; /* Mount uid for root directory */ |
| 38 | gid_t gid; /* Mount gid for root directory */ |
| 39 | mode_t mode; /* Mount mode for root directory */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 40 | struct mempolicy *mpol; /* default memory policy for mappings */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) |
| 44 | { |
| 45 | return container_of(inode, struct shmem_inode_info, vfs_inode); |
| 46 | } |
| 47 | |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 48 | extern int init_tmpfs(void); |
| 49 | extern int shmem_fill_super(struct super_block *sb, void *data, int silent); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #endif |