minix/servers/hgfs/mount.c

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/* This file contains mount and unmount functionality.
*
* The entry points into this file are:
* do_readsuper perform the READSUPER file system call
* do_unmount perform the UNMOUNT file system call
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
/*===========================================================================*
* do_readsuper *
*===========================================================================*/
PUBLIC int do_readsuper()
{
/* Mount the file system.
*/
char path[PATH_MAX];
struct inode *ino;
struct hgfs_attr attr;
int r;
dprintf(("HGFS: readsuper (dev %x, flags %x)\n",
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(dev_t) m_in.REQ_DEV, m_in.REQ_FLAGS));
if (m_in.REQ_FLAGS & REQ_ISROOT) {
printf("HGFS: attempt to mount as root device\n");
return EINVAL;
}
state.read_only = !!(m_in.REQ_FLAGS & REQ_RDONLY);
state.dev = m_in.REQ_DEV;
init_dentry();
ino = init_inode();
attr.a_mask = HGFS_ATTR_MODE | HGFS_ATTR_SIZE;
/* We cannot continue if we fail to get the properties of the root inode at
* all, because we cannot guess the details of the root node to return to
* VFS. Print a (hopefully) helpful error message, and abort the mount.
*/
if ((r = verify_inode(ino, path, &attr)) != OK) {
if (r == EAGAIN)
printf("HGFS: shared folders disabled\n");
else if (opt.prefix[0] && (r == ENOENT || r == EACCES))
printf("HGFS: unable to access the given prefix directory\n");
else
printf("HGFS: unable to access shared folders\n");
return r;
}
m_out.RES_INODE_NR = INODE_NR(ino);
m_out.RES_MODE = get_mode(ino, attr.a_mode);
m_out.RES_FILE_SIZE_HI = ex64hi(attr.a_size);
m_out.RES_FILE_SIZE_LO = ex64lo(attr.a_size);
m_out.RES_UID = opt.uid;
m_out.RES_GID = opt.gid;
m_out.RES_DEV = NO_DEV;
m_out.RES_CONREQS = 1; /* We can handle only 1 request at a time */
state.mounted = TRUE;
return OK;
}
/*===========================================================================*
* do_unmount *
*===========================================================================*/
PUBLIC int do_unmount()
{
/* Unmount the file system.
*/
struct inode *ino;
dprintf(("HGFS: do_unmount\n"));
/* Decrease the reference count of the root inode. */
if ((ino = find_inode(ROOT_INODE_NR)) == NULL)
return EINVAL;
put_inode(ino);
/* There should not be any referenced inodes anymore now. */
if (have_used_inode())
printf("HGFS: in-use inodes left at unmount time!\n");
state.mounted = FALSE;
return OK;
}