reactos/drivers/filesystems/btrfs/worker-thread.c

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/* Copyright (c) Mark Harmstone 2016-17
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs 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 Lesser General Public Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
#include "btrfs_drv.h"
typedef struct {
device_extension* Vcb;
PIRP Irp;
WORK_QUEUE_ITEM item;
} job_info;
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NTSTATUS do_read_job(PIRP Irp) {
NTSTATUS Status;
ULONG bytes_read;
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bool top_level = is_top_level(Irp);
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT FileObject = IrpSp->FileObject;
fcb* fcb = FileObject->FsContext;
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bool acquired_fcb_lock = false;
Irp->IoStatus.Information = 0;
if (!ExIsResourceAcquiredSharedLite(fcb->Header.Resource)) {
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ExAcquireResourceSharedLite(fcb->Header.Resource, true);
acquired_fcb_lock = true;
}
_SEH2_TRY {
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Status = do_read(Irp, true, &bytes_read);
} _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
Status = _SEH2_GetExceptionCode();
} _SEH2_END;
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if (acquired_fcb_lock)
ExReleaseResourceLite(fcb->Header.Resource);
if (!NT_SUCCESS(Status))
ERR("do_read returned %08lx\n", Status);
Irp->IoStatus.Status = Status;
TRACE("read %Iu bytes\n", Irp->IoStatus.Information);
IoCompleteRequest(Irp, IO_NO_INCREMENT);
if (top_level)
IoSetTopLevelIrp(NULL);
TRACE("returning %08lx\n", Status);
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return Status;
}
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NTSTATUS do_write_job(device_extension* Vcb, PIRP Irp) {
bool top_level = is_top_level(Irp);
NTSTATUS Status;
_SEH2_TRY {
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Status = write_file(Vcb, Irp, true, true);
} _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
Status = _SEH2_GetExceptionCode();
} _SEH2_END;
if (!NT_SUCCESS(Status))
ERR("write_file returned %08lx\n", Status);
Irp->IoStatus.Status = Status;
TRACE("wrote %Iu bytes\n", Irp->IoStatus.Information);
IoCompleteRequest(Irp, IO_NO_INCREMENT);
if (top_level)
IoSetTopLevelIrp(NULL);
TRACE("returning %08lx\n", Status);
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return Status;
}
_Function_class_(WORKER_THREAD_ROUTINE)
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static void __stdcall do_job(void* context) {
job_info* ji = context;
PIO_STACK_LOCATION IrpSp = ji->Irp ? IoGetCurrentIrpStackLocation(ji->Irp) : NULL;
if (IrpSp->MajorFunction == IRP_MJ_READ) {
do_read_job(ji->Irp);
} else if (IrpSp->MajorFunction == IRP_MJ_WRITE) {
do_write_job(ji->Vcb, ji->Irp);
}
ExFreePool(ji);
}
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bool add_thread_job(device_extension* Vcb, PIRP Irp) {
job_info* ji;
ji = ExAllocatePoolWithTag(NonPagedPool, sizeof(job_info), ALLOC_TAG);
if (!ji) {
ERR("out of memory\n");
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return false;
}
ji->Vcb = Vcb;
ji->Irp = Irp;
if (!Irp->MdlAddress) {
PMDL Mdl;
LOCK_OPERATION op;
ULONG len;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
if (IrpSp->MajorFunction == IRP_MJ_READ) {
op = IoWriteAccess;
len = IrpSp->Parameters.Read.Length;
} else if (IrpSp->MajorFunction == IRP_MJ_WRITE) {
op = IoReadAccess;
len = IrpSp->Parameters.Write.Length;
} else {
ERR("unexpected major function %u\n", IrpSp->MajorFunction);
ExFreePool(ji);
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return false;
}
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Mdl = IoAllocateMdl(Irp->UserBuffer, len, false, false, Irp);
if (!Mdl) {
ERR("out of memory\n");
ExFreePool(ji);
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return false;
}
_SEH2_TRY {
MmProbeAndLockPages(Mdl, Irp->RequestorMode, op);
} _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
ERR("MmProbeAndLockPages raised status %08lx\n", _SEH2_GetExceptionCode());
IoFreeMdl(Mdl);
Irp->MdlAddress = NULL;
ExFreePool(ji);
_SEH2_YIELD(return FALSE);
} _SEH2_END;
}
ExInitializeWorkItem(&ji->item, do_job, ji);
ExQueueWorkItem(&ji->item, DelayedWorkQueue);
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return true;
}