66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
#ifndef __SHMEM_FS_H
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#define __SHMEM_FS_H
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#include <linux/swap.h>
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#include <linux/mempolicy.h>
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/* inode in-kernel data */
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#define SHMEM_NR_DIRECT 16
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struct shmem_inode_info {
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spinlock_t lock;
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unsigned long flags;
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unsigned long alloced; /* data pages alloced to file */
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unsigned long swapped; /* subtotal assigned to swap */
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unsigned long next_index; /* highest alloced index + 1 */
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struct shared_policy policy; /* NUMA memory alloc policy */
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struct page *i_indirect; /* top indirect blocks page */
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swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
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struct list_head swaplist; /* chain of maybes on swap */
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struct inode vfs_inode;
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#ifdef CONFIG_TMPFS_POSIX_ACL
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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#endif
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};
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struct shmem_sb_info {
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unsigned long max_blocks; /* How many blocks are allowed */
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unsigned long free_blocks; /* How many are left for allocation */
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unsigned long max_inodes; /* How many inodes are allowed */
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unsigned long free_inodes; /* How many are left for allocation */
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spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
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uid_t uid; /* Mount uid for root directory */
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gid_t gid; /* Mount gid for root directory */
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mode_t mode; /* Mount mode for root directory */
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struct mempolicy *mpol; /* default memory policy for mappings */
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};
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static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
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{
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return container_of(inode, struct shmem_inode_info, vfs_inode);
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}
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#ifdef CONFIG_TMPFS_POSIX_ACL
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int shmem_permission(struct inode *, int);
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int shmem_acl_init(struct inode *, struct inode *);
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void shmem_acl_destroy_inode(struct inode *);
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extern struct xattr_handler shmem_xattr_acl_access_handler;
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extern struct xattr_handler shmem_xattr_acl_default_handler;
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extern struct generic_acl_operations shmem_acl_ops;
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#else
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static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
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{
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return 0;
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}
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static inline void shmem_acl_destroy_inode(struct inode *inode)
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{
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}
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#endif /* CONFIG_TMPFS_POSIX_ACL */
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#endif
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