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