minix3/lib/libvtreefs/mount.c

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2020-02-21 00:59:27 +05:30
/* VTreeFS - mount.c - by Alen Stojanov and David van Moolenbroek */
#include "inc.h"
/*===========================================================================*
* fs_readsuper *
*===========================================================================*/
int fs_readsuper(void)
{
/* This function gets the root inode and sends back its details.
*/
struct inode *root;
/* Get the device number, for stat requests. */
fs_dev = fs_m_in.m_vfs_fs_readsuper.device;
/* The VTreeFS must not be mounted as a root file system. */
if (fs_m_in.m_vfs_fs_readsuper.flags & REQ_ISROOT)
return EINVAL;
/* Get the root inode and increase its reference count. */
root = get_root_inode();
ref_inode(root);
/* The system is now mounted. Call the initialization hook. */
if (vtreefs_hooks->init_hook != NULL)
vtreefs_hooks->init_hook();
/* Return the root inode's properties. */
fs_m_out.m_fs_vfs_readsuper.inode = get_inode_number(root);
fs_m_out.m_fs_vfs_readsuper.mode = root->i_stat.mode;
fs_m_out.m_fs_vfs_readsuper.file_size = root->i_stat.size;
fs_m_out.m_fs_vfs_readsuper.uid = root->i_stat.uid;
fs_m_out.m_fs_vfs_readsuper.gid = root->i_stat.gid;
fs_m_out.m_fs_vfs_readsuper.device = NO_DEV;
fs_m_out.m_fs_vfs_readsuper.flags = RES_NOFLAGS;
fs_mounted = TRUE;
return OK;
}
/*===========================================================================*
* fs_unmount *
*===========================================================================*/
int fs_unmount(void)
{
/* Unmount the file system.
*/
struct inode *root;
/* Decrease the count of the root inode. */
root = get_root_inode();
put_inode(root);
/* The system is unmounted. Call the cleanup hook. */
if (vtreefs_hooks->cleanup_hook != NULL)
vtreefs_hooks->cleanup_hook();
/* We can now be shut down safely. */
fs_mounted = FALSE;
return OK;
}