60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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#ifndef __KERN_FS_FS_H__
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#define __KERN_FS_FS_H__
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#include <defs.h>
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#include <mmu.h>
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#include <sem.h>
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#include <atomic.h>
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#define SECTSIZE 512
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#define PAGE_NSECT (PGSIZE / SECTSIZE)
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#define SWAP_DEV_NO 1
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#define DISK0_DEV_NO 2
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#define DISK1_DEV_NO 3
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void fs_init(void);
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void fs_cleanup(void);
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struct inode;
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struct file;
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/*
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* process's file related informaction
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*/
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struct files_struct {
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struct inode *pwd; // inode of present working directory
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struct file *fd_array; // opened files array
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atomic_t files_count; // the number of opened files
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semaphore_t files_sem; // lock protect sem
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};
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#define FILES_STRUCT_BUFSIZE (PGSIZE - sizeof(struct files_struct))
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#define FILES_STRUCT_NENTRY (FILES_STRUCT_BUFSIZE / sizeof(struct file))
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void lock_files(struct files_struct *filesp);
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void unlock_files(struct files_struct *filesp);
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struct files_struct *files_create(void);
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void files_destroy(struct files_struct *filesp);
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void files_closeall(struct files_struct *filesp);
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int dup_files(struct files_struct *to, struct files_struct *from);
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static inline int
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files_count(struct files_struct *filesp) {
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return atomic_read(&(filesp->files_count));
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}
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static inline int
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files_count_inc(struct files_struct *filesp) {
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return atomic_add_return(&(filesp->files_count), 1);
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}
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static inline int
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files_count_dec(struct files_struct *filesp) {
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return atomic_sub_return(&(filesp->files_count), 1);
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}
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#endif /* !__KERN_FS_FS_H__ */
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