minix/lib/libsffs/mount.c
David van Moolenbroek ef7b484e5c Create SFFS library out of HGFS
This Shared Folders File System library (libsffs) now contains all the
file system logic originally in HGFS. The actual HGFS server code is
now a stub that passes on all the work to libsffs. The libhgfs library
is changed accordingly.
2012-04-09 18:08:26 +02:00

96 lines
2.6 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()
{
/* 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, (dev_t) m_in.REQ_DEV, m_in.REQ_FLAGS));
if (m_in.REQ_FLAGS & REQ_ISROOT) {
printf("%s: attempt to mount as root device\n", sffs_name);
return EINVAL;
}
state.s_read_only = !!(m_in.REQ_FLAGS & REQ_RDONLY);
state.s_dev = m_in.REQ_DEV;
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.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 = sffs_params->p_uid;
m_out.RES_GID = sffs_params->p_gid;
m_out.RES_DEV = NO_DEV;
m_out.RES_CONREQS = 1; /* We can handle only 1 request at a time */
state.s_mounted = TRUE;
return OK;
}
/*===========================================================================*
* do_unmount *
*===========================================================================*/
int do_unmount()
{
/* 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;
}