0314acfb2d
Mostly removal of unused parameters from calls. Change-Id: I0eb7b568265d1669492d958e78b9e69d7cf6fc05
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
|
|
* Functions to manage the superblock of the filesystem. These functions are
|
|
* are called at the beginning and at the end of the server.
|
|
*/
|
|
|
|
#include "inc.h"
|
|
#include <string.h>
|
|
#include <minix/com.h>
|
|
#include <minix/u64.h>
|
|
#include <minix/bdev.h>
|
|
|
|
int release_vol_pri_desc(struct iso9660_vol_pri_desc *vol_pri)
|
|
{
|
|
/* Release the root dir root. */
|
|
if (vol_pri->i_count > 0) {
|
|
put_inode(vol_pri->inode_root);
|
|
vol_pri->inode_root = NULL;
|
|
vol_pri->i_count = 0;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
static int create_vol_pri_desc(struct iso9660_vol_pri_desc *vol_pri, char *buf,
|
|
size_t __unused address)
|
|
{
|
|
/*
|
|
* This function fullfill the super block data structure using the
|
|
* information contained in the buffer.
|
|
*/
|
|
struct iso9660_dir_record *root_record;
|
|
struct inode *root;
|
|
struct dir_extent *extent;
|
|
|
|
if (vol_pri->i_count > 0)
|
|
release_vol_pri_desc(vol_pri);
|
|
|
|
memcpy(vol_pri, buf, 2048);
|
|
|
|
/* Check various fields for consistency. */
|
|
if ((memcmp(vol_pri->standard_id, "CD001",
|
|
ISO9660_SIZE_STANDARD_ID) != 0) ||
|
|
(vol_pri->vd_version != 1) ||
|
|
(vol_pri->logical_block_size_l < 2048) ||
|
|
(vol_pri->file_struct_ver != 1))
|
|
return EINVAL;
|
|
|
|
lmfs_set_blocksize(vol_pri->logical_block_size_l);
|
|
|
|
/* Read root directory record. */
|
|
root_record = (struct iso9660_dir_record *)vol_pri->root_directory;
|
|
root = alloc_inode();
|
|
extent = alloc_extent();
|
|
|
|
extent->location =
|
|
root_record->loc_extent_l + root_record->ext_attr_rec_length;
|
|
extent->length =
|
|
root_record->data_length_l / vol_pri->logical_block_size_l;
|
|
if (root_record->data_length_l % vol_pri->logical_block_size_l)
|
|
extent->length++;
|
|
|
|
if (read_inode(root, extent, 0, NULL) != OK) {
|
|
free_extent(extent);
|
|
put_inode(root);
|
|
return EINVAL;
|
|
}
|
|
|
|
free_extent(extent);
|
|
vol_pri->inode_root = root;
|
|
vol_pri->i_count = 1;
|
|
|
|
return OK;
|
|
}
|
|
|
|
int read_vds(struct iso9660_vol_pri_desc *vol_pri, dev_t dev)
|
|
{
|
|
/*
|
|
* This function reads from a ISO9660 filesystem (in the device dev)
|
|
* the super block and saves it in vol_pri.
|
|
*/
|
|
size_t offset;
|
|
int vol_ok = FALSE, vol_pri_flag = FALSE;
|
|
int r;
|
|
static char sbbuf[ISO9660_MIN_BLOCK_SIZE];
|
|
int i = 0;
|
|
|
|
for(offset = ISO9660_SUPER_BLOCK_POSITION;
|
|
!vol_ok && i++ < MAX_ATTEMPTS;
|
|
offset += ISO9660_MIN_BLOCK_SIZE) {
|
|
/* Read the sector of the super block. */
|
|
r = bdev_read(dev, offset, sbbuf, ISO9660_MIN_BLOCK_SIZE,
|
|
BDEV_NOFLAGS);
|
|
|
|
if (r != ISO9660_MIN_BLOCK_SIZE) {
|
|
/* Damaged sector or what? */
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((sbbuf[0] & BYTE) == VD_PRIMARY) {
|
|
/* Copy the buffer in the data structure. */
|
|
if (create_vol_pri_desc(vol_pri, sbbuf, offset) == OK) {
|
|
vol_pri_flag = TRUE;
|
|
}
|
|
}
|
|
|
|
if ((sbbuf[0] & BYTE) == VD_SET_TERM) {
|
|
/* I dont need to save anything about it */
|
|
vol_ok = TRUE;
|
|
}
|
|
}
|
|
|
|
if (vol_ok == FALSE || vol_pri_flag == FALSE)
|
|
return EINVAL; /* If no superblock was found... */
|
|
else
|
|
return OK; /* otherwise. */
|
|
}
|