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99 lines
2.5 KiB
99 lines
2.5 KiB
#include <defs.h>
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#include <kmalloc.h>
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#include <sem.h>
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#include <vfs.h>
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#include <dev.h>
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#include <file.h>
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#include <sfs.h>
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#include <inode.h>
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#include <assert.h>
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//called when init_main proc start
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void
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fs_init(void) {
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vfs_init();
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dev_init();
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sfs_init();
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}
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void
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fs_cleanup(void) {
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vfs_cleanup();
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}
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void
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lock_files(struct files_struct *filesp) {
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down(&(filesp->files_sem));
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}
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void
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unlock_files(struct files_struct *filesp) {
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up(&(filesp->files_sem));
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}
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//Called when a new proc init
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struct files_struct *
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files_create(void) {
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//cprintf("[files_create]\n");
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static_assert((int)FILES_STRUCT_NENTRY > 128);
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struct files_struct *filesp;
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if ((filesp = kmalloc(sizeof(struct files_struct) + FILES_STRUCT_BUFSIZE)) != NULL) {
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filesp->pwd = NULL;
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filesp->fd_array = (void *)(filesp + 1);
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atomic_set(&(filesp->files_count), 0);
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sem_init(&(filesp->files_sem), 1);
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fd_array_init(filesp->fd_array);
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}
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return filesp;
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}
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//Called when a proc exit
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void
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files_destroy(struct files_struct *filesp) {
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// cprintf("[files_destroy]\n");
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assert(filesp != NULL && files_count(filesp) == 0);
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if (filesp->pwd != NULL) {
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vop_ref_dec(filesp->pwd);
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}
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int i;
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struct file *file = filesp->fd_array;
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for (i = 0; i < FILES_STRUCT_NENTRY; i ++, file ++) {
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if (file->status == FD_OPENED) {
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fd_array_close(file);
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}
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assert(file->status == FD_NONE);
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}
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kfree(filesp);
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}
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void
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files_closeall(struct files_struct *filesp) {
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// cprintf("[files_closeall]\n");
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assert(filesp != NULL && files_count(filesp) > 0);
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int i;
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struct file *file = filesp->fd_array;
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//skip the stdin & stdout
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for (i = 2, file += 2; i < FILES_STRUCT_NENTRY; i ++, file ++) {
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if (file->status == FD_OPENED) {
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fd_array_close(file);
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}
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}
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}
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int
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dup_files(struct files_struct *to, struct files_struct *from) {
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// cprintf("[dup_fs]\n");
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assert(to != NULL && from != NULL);
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assert(files_count(to) == 0 && files_count(from) > 0);
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if ((to->pwd = from->pwd) != NULL) {
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vop_ref_inc(to->pwd);
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}
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int i;
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struct file *to_file = to->fd_array, *from_file = from->fd_array;
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for (i = 0; i < FILES_STRUCT_NENTRY; i ++, to_file ++, from_file ++) {
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if (from_file->status == FD_OPENED) {
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/* alloc_fd first */
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to_file->status = FD_INIT;
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fd_array_dup(to_file, from_file);
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}
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}
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return 0;
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}
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