nuclear@93: /* implementation of the filesystem-related syscalls */
nuclear@93: 
nuclear@93: #include <stdio.h>
nuclear@93: #include <stdlib.h>
nuclear@93: #include <string.h>
nuclear@93: #include <assert.h>
nuclear@93: #include <errno.h>
nuclear@93: #include "fs.h"
nuclear@93: #include "part.h"
nuclear@93: #include "panic.h"
nuclear@93: #include "bdev.h"
nuclear@93: 
nuclear@93: static dev_t find_rootfs(void);
nuclear@93: 
nuclear@93: /* list of mounted filesystems
nuclear@93:  * XXX currently only one, the root filesystem
nuclear@93:  */
nuclear@93: static struct filesys *fslist;
nuclear@93: 
nuclear@93: 
nuclear@93: int sys_mount(char *mtpt, char *devname, unsigned int flags)
nuclear@93: {
nuclear@93: 	dev_t dev;
nuclear@93: 	int err;
nuclear@93: 	struct filesys *fs;
nuclear@93: 
nuclear@93: 	if(strcmp(mtpt, "/") != 0) {
nuclear@93: 		printf("only root can be mounted at the moment\n");
nuclear@93: 		return -EBUG;
nuclear@93: 	}
nuclear@93: 
nuclear@93: 	/* mounting root filesystem */
nuclear@93: 	if(fslist) {
nuclear@93: 		printf("root already mounted\n");
nuclear@93: 		return -EBUSY;
nuclear@93: 	}
nuclear@93: 
nuclear@93: 	if(devname) {
nuclear@93: 		dev = bdev_by_name(devname);
nuclear@93: 	} else {
nuclear@93: 		/* try to autodetect it */
nuclear@93: 		dev = find_rootfs();
nuclear@93: 	}
nuclear@93: 	if(!dev) {
nuclear@93: 		err = -ENOENT;
nuclear@93: 		goto rootfail;
nuclear@93: 	}
nuclear@93: 
nuclear@93: 	if(!(fs = malloc(sizeof *fslist))) {
nuclear@93: 		err = -ENOMEM;
nuclear@93: 		goto rootfail;
nuclear@93: 	}
nuclear@93: 	if((err = openfs(fs, dev)) != 0) {
nuclear@93: 		free(fs);
nuclear@93: 		goto rootfail;
nuclear@93: 	}
nuclear@93: 
nuclear@93: 	fslist = fs;
nuclear@93: 	return 0;
nuclear@93: 
nuclear@93: rootfail:
nuclear@93: 	panic("failed to mount root filesystem: %d\n", -err);
nuclear@93: 	return err;	/* unreachable */
nuclear@93: }
nuclear@93: 
nuclear@93: #define PART_TYPE	0xcc
nuclear@93: static dev_t find_rootfs(void)
nuclear@93: {
nuclear@93: 	dev_t dev = 0;
nuclear@93: 	int i, num_dev, partid;
nuclear@93: 	struct partition *plist, *p;
nuclear@93: 	struct superblock *sb = malloc(BLKSZ);
nuclear@93: 	char name[16];
nuclear@93: 
nuclear@93: 	assert(sb);
nuclear@93: 
nuclear@93: 	num_dev = ata_num_devices();
nuclear@93: 	for(i=0; i<num_dev; i++) {
nuclear@93: 		plist = p = get_part_list(i);
nuclear@93: 
nuclear@93: 		partid = 0;
nuclear@93: 		while(p) {
nuclear@93: 			if(get_part_type(p) == PART_TYPE) {
nuclear@93: 				/* found the correct partition, now read the superblock
nuclear@93: 				 * and make sure it's got the correct magic id
nuclear@93: 				 */
nuclear@93: 				blk_read(i, p->start_sect / 2 + 1, BLKSZ, sb);
nuclear@93: 
nuclear@93: 				if(sb->magic == MAGIC) {
nuclear@93: 					sprintf(name, "ata%dp%d", i, partid);
nuclear@93: 					printf("found root: %s\n", name);
nuclear@93: 					dev = bdev_by_name(name);
nuclear@93: 					break;
nuclear@93: 				}
nuclear@93: 			}
nuclear@93: 			p = p->next;
nuclear@93: 			partid++;
nuclear@93: 		}
nuclear@93: 		free_part_list(plist);
nuclear@93: 		if(dev) break;
nuclear@93: 	}
nuclear@93: 
nuclear@93: 	free(sb);
nuclear@93: 	return dev;
nuclear@93: }