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91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* Copyright (c) Mark Harmstone 2016-17
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*
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* This file is part of WinBtrfs.
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*
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* WinBtrfs is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public Licence as published by
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* the Free Software Foundation, either version 3 of the Licence, or
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* (at your option) any later version.
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*
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* WinBtrfs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public Licence for more details.
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*
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* You should have received a copy of the GNU Lesser General Public Licence
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* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
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#include "btrfs_drv.h"
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CACHE_MANAGER_CALLBACKS cache_callbacks;
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static BOOLEAN __stdcall acquire_for_lazy_write(PVOID Context, BOOLEAN Wait) {
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PFILE_OBJECT FileObject = Context;
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fcb* fcb = FileObject->FsContext;
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TRACE("(%p, %u)\n", Context, Wait);
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if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, Wait))
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return false;
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if (!ExAcquireResourceExclusiveLite(fcb->Header.Resource, Wait)) {
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ExReleaseResourceLite(&fcb->Vcb->tree_lock);
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return false;
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}
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fcb->lazy_writer_thread = KeGetCurrentThread();
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IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
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return true;
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}
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static void __stdcall release_from_lazy_write(PVOID Context) {
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PFILE_OBJECT FileObject = Context;
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fcb* fcb = FileObject->FsContext;
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TRACE("(%p)\n", Context);
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fcb->lazy_writer_thread = NULL;
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ExReleaseResourceLite(fcb->Header.Resource);
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ExReleaseResourceLite(&fcb->Vcb->tree_lock);
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if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
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IoSetTopLevelIrp(NULL);
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}
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static BOOLEAN __stdcall acquire_for_read_ahead(PVOID Context, BOOLEAN Wait) {
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PFILE_OBJECT FileObject = Context;
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fcb* fcb = FileObject->FsContext;
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TRACE("(%p, %u)\n", Context, Wait);
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if (!ExAcquireResourceSharedLite(fcb->Header.Resource, Wait))
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return false;
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IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
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return true;
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}
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static void __stdcall release_from_read_ahead(PVOID Context) {
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PFILE_OBJECT FileObject = Context;
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fcb* fcb = FileObject->FsContext;
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TRACE("(%p)\n", Context);
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ExReleaseResourceLite(fcb->Header.Resource);
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if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
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IoSetTopLevelIrp(NULL);
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}
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void init_cache() {
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cache_callbacks.AcquireForLazyWrite = acquire_for_lazy_write;
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cache_callbacks.ReleaseFromLazyWrite = release_from_lazy_write;
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cache_callbacks.AcquireForReadAhead = acquire_for_read_ahead;
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cache_callbacks.ReleaseFromReadAhead = release_from_read_ahead;
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}
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