96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
|
/* 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 *
|
||
|
|
*===========================================================================*/
|
||
|
|
int do_readsuper(void)
|
||
|
|
{
|
||
|
|
/* Mount the file system.
|
||
|
|
*/
|
||
|
|
char path[PATH_MAX];
|
||
|
|
struct inode *ino;
|
||
|
|
struct sffs_attr attr;
|
||
|
|
int r;
|
||
|
|
|
||
|
|
dprintf(("%s: readsuper (dev %x, flags %x)\n",
|
||
|
|
sffs_name, m_in.m_vfs_fs_readsuper.device, m_in.vfs_fs_readsuper.flags));
|
||
|
|
|
||
|
|
if (m_in.m_vfs_fs_readsuper.flags & REQ_ISROOT) {
|
||
|
|
printf("%s: attempt to mount as root device\n", sffs_name);
|
||
|
|
|
||
|
|
return EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
state.s_read_only = !!(m_in.m_vfs_fs_readsuper.flags & REQ_RDONLY);
|
||
|
|
state.s_dev = m_in.m_vfs_fs_readsuper.device;
|
||
|
|
|
||
|
|
init_dentry();
|
||
|
|
ino = init_inode();
|
||
|
|
|
||
|
|
attr.a_mask = SFFS_ATTR_MODE | SFFS_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("%s: shared folders disabled\n", sffs_name);
|
||
|
|
else if (sffs_params->p_prefix[0] && (r == ENOENT || r == EACCES))
|
||
|
|
printf("%s: unable to access the given prefix directory\n",
|
||
|
|
sffs_name);
|
||
|
|
else
|
||
|
|
printf("%s: unable to access shared folders\n", sffs_name);
|
||
|
|
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
m_out.m_fs_vfs_readsuper.inode = INODE_NR(ino);
|
||
|
|
m_out.m_fs_vfs_readsuper.mode = get_mode(ino, attr.a_mode);
|
||
|
|
m_out.m_fs_vfs_readsuper.file_size = attr.a_size;
|
||
|
|
m_out.m_fs_vfs_readsuper.uid = sffs_params->p_uid;
|
||
|
|
m_out.m_fs_vfs_readsuper.gid = sffs_params->p_gid;
|
||
|
|
m_out.m_fs_vfs_readsuper.device = NO_DEV;
|
||
|
|
m_out.m_fs_vfs_readsuper.flags = RES_64BIT;
|
||
|
|
|
||
|
|
state.s_mounted = TRUE;
|
||
|
|
|
||
|
|
return OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*===========================================================================*
|
||
|
|
* do_unmount *
|
||
|
|
*===========================================================================*/
|
||
|
|
int do_unmount(void)
|
||
|
|
{
|
||
|
|
/* Unmount the file system.
|
||
|
|
*/
|
||
|
|
struct inode *ino;
|
||
|
|
|
||
|
|
dprintf(("%s: do_unmount\n", sffs_name));
|
||
|
|
|
||
|
|
/* 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("%s: in-use inodes left at unmount time!\n", sffs_name);
|
||
|
|
|
||
|
|
state.s_mounted = FALSE;
|
||
|
|
|
||
|
|
return OK;
|
||
|
|
}
|