minix3/fs/iso9660fs/mount.c

102 lines
2.7 KiB
C

#include "inc.h"
#include <minix/vfsif.h>
#include <minix/bdev.h>
#include "const.h"
#include "glo.h"
/*===========================================================================*
* fs_readsuper *
*===========================================================================*/
int fs_readsuper() {
cp_grant_id_t label_gid;
size_t label_len;
int r = OK;
fs_dev = fs_m_in.m_vfs_fs_readsuper.device;
label_gid = fs_m_in.m_vfs_fs_readsuper.grant;
label_len = fs_m_in.m_vfs_fs_readsuper.path_len;
if (label_len > sizeof(fs_dev_label))
return(EINVAL);
r = sys_safecopyfrom(fs_m_in.m_source, label_gid, 0, (vir_bytes)fs_dev_label,
label_len);
if (r != OK) {
printf("ISOFS %s:%d safecopyfrom failed: %d\n", __FILE__, __LINE__, r);
return(EINVAL);
}
/* Map the driver label for this major */
bdev_driver(fs_dev, fs_dev_label);
/* Open the device the file system lives on in read only mode */
if (bdev_open(fs_dev, BDEV_R_BIT) != OK) {
return(EINVAL);
}
/* Read the superblock */
r = read_vds(&v_pri, fs_dev);
if (r != OK) {
bdev_close(fs_dev);
return(r);
}
lmfs_set_blocksize(v_pri.logical_block_size_l, major(fs_dev));
/* Return some root inode properties */
fs_m_out.m_fs_vfs_readsuper.inode = ID_DIR_RECORD(v_pri.dir_rec_root);
fs_m_out.m_fs_vfs_readsuper.mode = v_pri.dir_rec_root->d_mode;
fs_m_out.m_fs_vfs_readsuper.file_size = v_pri.dir_rec_root->d_file_size;
fs_m_out.m_fs_vfs_readsuper.uid = SYS_UID; /* Always root */
fs_m_out.m_fs_vfs_readsuper.gid = SYS_GID; /* operator */
fs_m_out.m_fs_vfs_readsuper.flags = RES_NOFLAGS;
return(r);
}
/*===========================================================================*
* fs_mountpoint *
*===========================================================================*/
int fs_mountpoint()
{
/* 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;
/* Temporarily open the file. */
if ((rip = get_dir_record(fs_m_in.m_vfs_fs_mountpoint.inode)) == NULL)
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);
}
/*===========================================================================*
* fs_unmount *
*===========================================================================*/
int fs_unmount(void) {
release_v_pri(&v_pri); /* Release the super block */
bdev_close(fs_dev);
unmountdone = TRUE;
return(OK);
}