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sortix--sortix/kernel/mtable.cpp
2014-12-26 21:45:29 +01:00

92 lines
2.4 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
mtable.cpp
Class to keep track of mount points.
*******************************************************************************/
#include <string.h>
#include <sortix/kernel/inode.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/kthread.h>
#include <sortix/kernel/mtable.h>
#include <sortix/kernel/refcount.h>
namespace Sortix {
MountTable::MountTable()
{
mtablelock = KTHREAD_MUTEX_INITIALIZER;
mounts = NULL;
nummounts = 0;
mountsalloced = 0;
}
MountTable::~MountTable()
{
delete[] mounts;
}
Ref<MountTable> MountTable::Fork()
{
ScopedLock lock(&mtablelock);
Ref<MountTable> clone(new MountTable);
if ( !clone )
return Ref<MountTable>(NULL);
clone->mounts = new mountpoint_t[nummounts];
if ( !clone->mounts )
return Ref<MountTable>(NULL);
clone->nummounts = nummounts;
clone->mountsalloced = nummounts;
for ( size_t i = 0; i < nummounts; i++ )
clone->mounts[i] = mounts[i];
return clone;
}
bool MountTable::AddMount(ino_t ino, dev_t dev, Ref<Inode> inode, bool fsbind)
{
ScopedLock lock(&mtablelock);
return AddMountUnlocked(ino, dev, inode, fsbind);
}
bool MountTable::AddMountUnlocked(ino_t ino, dev_t dev, Ref<Inode> inode, bool fsbind)
{
if ( nummounts == mountsalloced )
{
size_t newalloced = mountsalloced ? 2UL * mountsalloced : 4UL;
mountpoint_t* newmounts = new mountpoint_t[newalloced];
if ( !newmounts )
return false;
for ( size_t i = 0; i < nummounts; i++ )
newmounts[i] = mounts[i];
delete[] mounts;
mounts = newmounts;
mountsalloced = newalloced;
}
mountpoint_t* mp = mounts + nummounts++;
mp->ino = ino;
mp->dev = dev;
mp->inode = inode;
mp->fsbind = fsbind;
return true;
}
} // namespace Sortix