tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __SHMEM_FS_H
2#define __SHMEM_FS_H
3
4#include <linux/swap.h>
5#include <linux/mempolicy.h>
6
7/* inode in-kernel data */
8
9#define SHMEM_NR_DIRECT 16
10
11struct shmem_inode_info {
12 spinlock_t lock;
13 unsigned long flags;
14 unsigned long alloced; /* data pages alloced to file */
15 unsigned long swapped; /* subtotal assigned to swap */
16 unsigned long next_index; /* highest alloced index + 1 */
17 struct shared_policy policy; /* NUMA memory alloc policy */
18 struct page *i_indirect; /* top indirect blocks page */
19 swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
20 struct list_head swaplist; /* chain of maybes on swap */
21 struct inode vfs_inode;
22};
23
24struct shmem_sb_info {
25 unsigned long max_blocks; /* How many blocks are allowed */
26 unsigned long free_blocks; /* How many are left for allocation */
27 unsigned long max_inodes; /* How many inodes are allowed */
28 unsigned long free_inodes; /* How many are left for allocation */
29 spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
30 uid_t uid; /* Mount uid for root directory */
31 gid_t gid; /* Mount gid for root directory */
32 mode_t mode; /* Mount mode for root directory */
33 struct mempolicy *mpol; /* default memory policy for mappings */
34};
35
36static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
37{
38 return container_of(inode, struct shmem_inode_info, vfs_inode);
39}
40
41#ifdef CONFIG_TMPFS_POSIX_ACL
42int shmem_permission(struct inode *, int);
43int shmem_acl_init(struct inode *, struct inode *);
44
45extern struct xattr_handler shmem_xattr_acl_access_handler;
46extern struct xattr_handler shmem_xattr_acl_default_handler;
47
48extern struct generic_acl_operations shmem_acl_ops;
49
50#else
51static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
52{
53 return 0;
54}
55#endif /* CONFIG_TMPFS_POSIX_ACL */
56
57#endif