minix/lib/libpuffs/mount.c

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/* Created (MFS based):
* June 2011 (Evgeniy Ivanov)
*/
#include "fs.h"
#include <fcntl.h>
#include <string.h>
#include <minix/com.h>
#include <sys/stat.h>
#include <minix/ds.h>
#include <minix/vfsif.h>
#include "puffs_priv.h"
/*===========================================================================*
* fs_readsuper *
*===========================================================================*/
int fs_readsuper(void)
{
struct vattr *root_va;
fs_dev = fs_m_in.m_vfs_fs_readsuper.device;
is_readonly_fs = (fs_m_in.m_vfs_fs_readsuper.flags & REQ_RDONLY) ? 1 : 0;
is_root_fs = (fs_m_in.m_vfs_fs_readsuper.flags & REQ_ISROOT) ? 1 : 0;
/* Open root pnode */
global_pu->pu_pn_root->pn_count = 1;
/* Root pnode properties */
root_va = &global_pu->pu_pn_root->pn_va;
fs_m_out.m_fs_vfs_readsuper.inode = root_va->va_fileid;
fs_m_out.m_fs_vfs_readsuper.mode = root_va->va_mode;
fs_m_out.m_fs_vfs_readsuper.file_size = root_va->va_size;
fs_m_out.m_fs_vfs_readsuper.uid = root_va->va_uid;
fs_m_out.m_fs_vfs_readsuper.gid = root_va->va_gid;
fs_m_out.m_fs_vfs_readsuper.flags = RES_NOFLAGS;
return(OK);
}
/*===========================================================================*
* fs_mountpoint *
*===========================================================================*/
int fs_mountpoint(void)
{
/* This function looks up the mount point, it checks the condition whether
* the partition can be mounted on the pnode or not.
*/
int r = OK;
struct puffs_node *pn;
mode_t bits;
/*
* XXX: we assume that lookup was done first, so pnode can be found with
* puffs_pn_nodewalk.
*/
if ((pn = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.m_vfs_fs_mountpoint.inode))
== NULL)
return(EINVAL);
if (pn->pn_mountpoint) r = EBUSY;
/* It may not be special. */
bits = pn->pn_va.va_mode & I_TYPE;
if(bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
if (r == OK)
pn->pn_mountpoint = TRUE;
return(r);
}
/*===========================================================================*
* fs_unmount *
*===========================================================================*/
int fs_unmount(void)
{
int error;
/* XXX there is no information about flags, 0 should be safe enough */
error = global_pu->pu_ops.puffs_fs_unmount(global_pu, 0);
if (error) {
/* XXX we can't return any error to VFS */
lpuffs_debug("user handler failed to unmount filesystem!\
Force unmount!\n");
}
fs_sync();
/* Finish off the unmount. */
PU_SETSTATE(global_pu, PUFFS_STATE_UNMOUNTED);
unmountdone = TRUE;
global_pu->pu_pn_root->pn_count--;
return(OK);
}