include/linux/shmem_fs.h

   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
  11 struct 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 #ifdef CONFIG_TMPFS_POSIX_ACL
  23         struct posix_acl        *i_acl;
  24         struct posix_acl        *i_default_acl;
  25 #endif
  26 };
  27
  28 struct shmem_sb_info {
  29         unsigned long max_blocks;   /* How many blocks are allowed */
  30         unsigned long free_blocks;  /* How many are left for allocation */
  31         unsigned long max_inodes;   /* How many inodes are allowed */
  32         unsigned long free_inodes;  /* How many are left for allocation */
  33         spinlock_t stat_lock;       /* Serialize shmem_sb_info changes */
  34         uid_t uid;                  /* Mount uid for root directory */
  35         gid_t gid;                  /* Mount gid for root directory */
  36         mode_t mode;                /* Mount mode for root directory */
  37         struct mempolicy *mpol;     /* default memory policy for mappings */
  38 };
  39
  40 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
  41 {
  42         return container_of(inode, struct shmem_inode_info, vfs_inode);
  43 }
  44
  45 #ifdef CONFIG_TMPFS_POSIX_ACL
  46 int shmem_permission(struct inode *, int);
  47 int shmem_acl_init(struct inode *, struct inode *);
  48 void shmem_acl_destroy_inode(struct inode *);
  49
  50 extern struct xattr_handler shmem_xattr_acl_access_handler;
  51 extern struct xattr_handler shmem_xattr_acl_default_handler;
  52
  53 extern struct generic_acl_operations shmem_acl_ops;
  54
  55 #else
  56 static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
  57 {
  58         return 0;
  59 }
  60 static inline void shmem_acl_destroy_inode(struct inode *inode)
  61 {
  62 }
  63 #endif  /* CONFIG_TMPFS_POSIX_ACL */
  64
  65 #endif