46 lines
1.5 KiB
C
46 lines
1.5 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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#include <linux/percpu_counter.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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};
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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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struct percpu_counter used_blocks; /* How many are allocated */
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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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extern int init_tmpfs(void);
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extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
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#endif
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