minix/servers/iso9660fs/mount.c
2009-10-01 14:00:27 +00:00

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;
}