98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
#include <defs.h>
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#include <stdio.h>
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#include <string.h>
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#include <vfs.h>
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#include <inode.h>
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#include <sem.h>
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#include <kmalloc.h>
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#include <error.h>
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static semaphore_t bootfs_sem;
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static struct inode *bootfs_node = NULL;
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extern void vfs_devlist_init(void);
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// __alloc_fs - allocate memory for fs, and set fs type
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struct fs *
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__alloc_fs(int type) {
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struct fs *fs;
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if ((fs = kmalloc(sizeof(struct fs))) != NULL) {
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fs->fs_type = type;
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}
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return fs;
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}
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// vfs_init - vfs initialize
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void
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vfs_init(void) {
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sem_init(&bootfs_sem, 1);
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vfs_devlist_init();
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}
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// lock_bootfs - lock for bootfs
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static void
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lock_bootfs(void) {
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down(&bootfs_sem);
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}
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// ulock_bootfs - ulock for bootfs
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static void
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unlock_bootfs(void) {
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up(&bootfs_sem);
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}
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// change_bootfs - set the new fs inode
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static void
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change_bootfs(struct inode *node) {
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struct inode *old;
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lock_bootfs();
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{
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old = bootfs_node, bootfs_node = node;
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}
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unlock_bootfs();
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if (old != NULL) {
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vop_ref_dec(old);
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}
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}
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// vfs_set_bootfs - change the dir of file system
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int
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vfs_set_bootfs(char *fsname) {
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struct inode *node = NULL;
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if (fsname != NULL) {
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char *s;
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if ((s = strchr(fsname, ':')) == NULL || s[1] != '\0') {
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return -E_INVAL;
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}
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int ret;
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if ((ret = vfs_chdir(fsname)) != 0) {
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return ret;
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}
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if ((ret = vfs_get_curdir(&node)) != 0) {
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return ret;
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}
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}
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change_bootfs(node);
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return 0;
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}
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// vfs_get_bootfs - get the inode of bootfs
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int
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vfs_get_bootfs(struct inode **node_store) {
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struct inode *node = NULL;
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if (bootfs_node != NULL) {
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lock_bootfs();
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{
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if ((node = bootfs_node) != NULL) {
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vop_ref_inc(bootfs_node);
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}
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}
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unlock_bootfs();
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}
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if (node == NULL) {
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return -E_NOENT;
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}
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*node_store = node;
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return 0;
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}
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