151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
#include "inc.h"
|
|
#include <string.h>
|
|
#include <minix/com.h>
|
|
#include <minix/vfsif.h>
|
|
#include <minix/ds.h>
|
|
|
|
#include "const.h"
|
|
#include "glo.h"
|
|
|
|
/* Function of mounting and unmounting for ISO9660 */
|
|
|
|
/* Reads the super inode. This function is requested at the mounting of the
|
|
* filesystem. */
|
|
/*===========================================================================*
|
|
* fs_readsuper *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_readsuper() {
|
|
|
|
int r = OK;
|
|
|
|
fs_dev = fs_m_in.REQ_DEV;
|
|
|
|
driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e = fs_m_in.REQ_DRIVER_E;
|
|
vfs_slink_storage = fs_m_in.REQ_SLINK_STORAGE;
|
|
|
|
r = read_vds(&v_pri, fs_dev); /* This function reads the super block on the
|
|
* device and save it in v_pri */
|
|
|
|
if (r != OK) return(r);
|
|
|
|
/* Return some root inode properties */
|
|
fs_m_out.RES_INODE_NR = ID_DIR_RECORD(v_pri.dir_rec_root);
|
|
fs_m_out.RES_MODE = I_DIRECTORY;
|
|
fs_m_out.RES_FILE_SIZE = v_pri.dir_rec_root->d_file_size;
|
|
|
|
/* and some partition properties */
|
|
fs_m_out.RES_MAXSIZE = v_pri.volume_space_size_l; /* Volume space */
|
|
fs_m_out.RES_BLOCKSIZE = v_pri.logical_block_size_l; /* block size */
|
|
|
|
return r;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* fs_readsuper_s *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_readsuper_s() {
|
|
|
|
cp_grant_id_t label_gid;
|
|
size_t label_len;
|
|
int r = OK;
|
|
unsigned long tasknr;
|
|
endpoint_t driver_e;
|
|
|
|
fs_dev = fs_m_in.REQ_DEV;
|
|
|
|
label_gid= fs_m_in.REQ_GRANT2;
|
|
label_len= fs_m_in.REQ_PATH_LEN;
|
|
|
|
if (label_len > sizeof(fs_dev_label)) {
|
|
printf("iso9660fs:fs_readsuper: label too long\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
r= sys_safecopyfrom(fs_m_in.m_source, label_gid, 0, (vir_bytes)fs_dev_label,
|
|
label_len, D);
|
|
if (r != OK) {
|
|
printf("iso9660fs: fs_readsuper: safecopyfrom failed: %d\n", r);
|
|
return EINVAL;
|
|
}
|
|
|
|
r= ds_retrieve_u32(fs_dev_label, &tasknr);
|
|
if (r != OK) {
|
|
printf("mfs:fs_readsuper: ds_retrieve_u32 failed for '%s': %d\n",
|
|
fs_dev_label, r);
|
|
return EINVAL;
|
|
}
|
|
|
|
driver_e= tasknr;
|
|
|
|
/* Map the driver endpoint for this major */
|
|
driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e = driver_e;
|
|
|
|
if (dev_open(driver_e, fs_dev, driver_e,
|
|
fs_m_in.REQ_READONLY ? R_BIT : (R_BIT|W_BIT)) != OK) {
|
|
return(EINVAL);
|
|
}
|
|
|
|
r = read_vds(&v_pri, fs_dev); /* This function reads the super block on the
|
|
* device and save it in v_pri */
|
|
|
|
if (r != OK)
|
|
return(r);
|
|
|
|
/* Return some root inode properties */
|
|
fs_m_out.RES_INODE_NR = ID_DIR_RECORD(v_pri.dir_rec_root);
|
|
fs_m_out.RES_MODE = v_pri.dir_rec_root->d_mode;
|
|
fs_m_out.RES_FILE_SIZE = v_pri.dir_rec_root->d_file_size;
|
|
fs_m_out.RES_UID = 0; /* root */
|
|
fs_m_out.RES_GID = 0; /* operator */
|
|
|
|
/* and some partition properties */
|
|
fs_m_out.RES_MAXSIZE = v_pri.volume_space_size_l; /* Volume space */
|
|
fs_m_out.RES_BLOCKSIZE = v_pri.logical_block_size_l; /* block size */
|
|
|
|
return r;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* fs_mountpoint_s *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_mountpoint_s() {
|
|
/* This function looks up the mount point, it checks the condition whether
|
|
* the partition can be mounted on the inode or not.
|
|
*/
|
|
|
|
register struct dir_record *rip;
|
|
int r = OK;
|
|
mode_t bits;
|
|
|
|
/* Temporarily open the file. */
|
|
if ((rip = get_dir_record(fs_m_in.REQ_INODE_NR)) == NULL) {
|
|
printf("ISO9660FS(%d) get_inode by fs_mountpoint() failed\n", SELF_E);
|
|
return(EINVAL);
|
|
}
|
|
|
|
if (rip->d_mountpoint)
|
|
r= EBUSY;
|
|
|
|
/* If the inode is not a dir returns error */
|
|
if ((rip->d_mode & I_TYPE) != I_DIRECTORY)
|
|
r = ENOTDIR;
|
|
|
|
release_dir_record(rip);
|
|
|
|
if (r == OK)
|
|
rip->d_mountpoint = TRUE;
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Unmount the filesystem */
|
|
/*===========================================================================*
|
|
* fs_unmount *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_unmount(void) {
|
|
release_v_pri(&v_pri); /* Release the super block */
|
|
|
|
dev_close(driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e, fs_dev);
|
|
|
|
return OK;
|
|
}
|