88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
/*
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* Copyright (c) 2012, 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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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