minix/servers/iso9660fs/mount.c

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#include "inc.h"
#include <string.h>
#include <minix/com.h>
#include <minix/vfsif.h>
#include <minix/ds.h>
#include "const.h"
#include "glo.h"
/*===========================================================================*
* fs_readsuper *
*===========================================================================*/
PUBLIC int fs_readsuper() {
cp_grant_id_t label_gid;
size_t label_len;
int r = OK;
unsigned long tasknr;
endpoint_t driver_e;
int readonly, isroot;
fs_dev = fs_m_in.REQ_DEV;
label_gid = fs_m_in.REQ_GRANT;
label_len = fs_m_in.REQ_PATH_LEN;
readonly = 1; /* Always mount devices read only. */
isroot = (fs_m_in.REQ_FLAGS & REQ_ISROOT) ? 1 : 0;
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, D);
if (r != OK) {
printf("ISOFS %s:%d safecopyfrom failed: %d\n", __FILE__, __LINE__, r);
return(EINVAL);
}
r = ds_retrieve_u32(fs_dev_label, &tasknr);
if (r != OK) {
printf("ISOFS %s:%d ds_retrieve_u32 failed for '%s': %d\n",
__FILE__, __LINE__, 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;
/* Open the device the file system lives on */
if (dev_open(driver_e, fs_dev, driver_e,
readonly ? R_BIT : (R_BIT|W_BIT)) != OK) {
return(EINVAL);
}
/* Read the superblock */
r = read_vds(&v_pri, fs_dev);
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_LO = v_pri.dir_rec_root->d_file_size;
fs_m_out.RES_UID = SYS_UID; /* Always root */
fs_m_out.RES_GID = SYS_GID; /* operator */
return(r);
}
/*===========================================================================*
* fs_mountpoint *
*===========================================================================*/
PUBLIC 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;
mode_t bits;
/* Temporarily open the file. */
if ((rip = get_dir_record(fs_m_in.REQ_INODE_NR)) == 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 *
*===========================================================================*/
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);
}