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[driver] storing volinfo in devext

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instaed of assembling FILE_FS_VOLUME_INFORMATION on every volume
query, story it in device extensions and just copy bytes.
This commit is contained in:
Olga Kornievskaia 2011-12-22 14:50:53 -05:00
parent ab8a958e35
commit a132b8b79c
1 changed files with 31 additions and 28 deletions
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59
sys/nfs41_driver.c
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@ -334,6 +334,11 @@ typedef struct _NFS41_NETROOT_EXTENSION {
#define FS_NAME_LEN (sizeof(FS_NAME) - sizeof(WCHAR))
#define FS_ATTR_LEN (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + FS_NAME_LEN)
/* FileSystemName as reported by FileFsAttributeInfo query */
#define VOL_NAME L"PnfsVolume"
#define VOL_NAME_LEN (sizeof(VOL_NAME) - sizeof(WCHAR))
#define VOL_ATTR_LEN (sizeof(FILE_FS_VOLUME_INFORMATION) + VOL_NAME_LEN)
typedef struct _NFS41_V_NET_ROOT_EXTENSION {
NODE_TYPE_CODE NodeTypeCode;
NODE_BYTE_SIZE NodeByteSize;
@ -392,6 +397,8 @@ typedef struct _NFS41_DEVICE_EXTENSION {
ULONG ActiveNodes;
HANDLE SharedMemorySection;
DWORD nfs41d_version;
BYTE VolAttrs[VOL_ATTR_LEN];
DWORD VolAttrsLen;
} NFS41_DEVICE_EXTENSION, *PNFS41_DEVICE_EXTENSION;
#define NFS41GetDeviceExtension(RxContext,pExt) \
@ -3794,6 +3801,18 @@ NTSTATUS map_volume_errors(
}
}
void nfs41_create_volume_info(PFILE_FS_VOLUME_INFORMATION pVolInfo, DWORD *len)
{
DECLARE_CONST_UNICODE_STRING(VolName, VOL_NAME);
RtlZeroMemory(pVolInfo, sizeof(FILE_FS_VOLUME_INFORMATION));
pVolInfo->VolumeSerialNumber = 0xBABAFACE;
pVolInfo->VolumeLabelLength = VolName.Length;
RtlCopyMemory(&pVolInfo->VolumeLabel[0], (PVOID)VolName.Buffer,
VolName.MaximumLength);
*len = sizeof(FILE_FS_VOLUME_INFORMATION) + VolName.Length;
}
NTSTATUS nfs41_QueryVolumeInformation(
IN OUT PRX_CONTEXT RxContext)
{
@ -3807,6 +3826,8 @@ NTSTATUS nfs41_QueryVolumeInformation(
__notnull PNFS41_NETROOT_EXTENSION pNetRootContext =
NFS41GetNetRootExtension(SrvOpen->pVNetRoot->pNetRoot);
__notnull PNFS41_FOBX nfs41_fobx = NFS41GetFobxExtension(RxContext->pFobx);
NFS41GetDeviceExtension(RxContext, DevExt);
#ifdef ENABLE_TIMINGS
LARGE_INTEGER t1, t2;
t1 = KeQueryPerformanceCounter(NULL);
@ -3817,35 +3838,16 @@ NTSTATUS nfs41_QueryVolumeInformation(
switch (InfoClass) {
case FileFsVolumeInformation:
{
PFILE_FS_VOLUME_INFORMATION pVolInfo = RxContext->Info.Buffer;
DECLARE_CONST_UNICODE_STRING(Label, L"PnfsVolume");
if (RxContext->Info.LengthRemaining >= sizeof(FILE_FS_VOLUME_INFORMATION)) {
RtlZeroMemory(pVolInfo, sizeof(FILE_FS_VOLUME_INFORMATION));
pVolInfo->VolumeCreationTime.QuadPart = 0;
pVolInfo->VolumeSerialNumber = 0xBABAFACE;
pVolInfo->SupportsObjects = FALSE;
RxContext->Info.LengthRemaining -= sizeof(FILE_FS_VOLUME_INFORMATION);
} else {
status = STATUS_BUFFER_TOO_SMALL;
RxContext->InformationToReturn =
sizeof(FILE_FS_VOLUME_INFORMATION) + Label.Length;
goto out;
}
if (RxContext->Info.LengthRemaining < Label.Length) {
status = STATUS_BUFFER_OVERFLOW;
goto out;
} else {
pVolInfo->VolumeLabelLength = Label.Length;
RtlCopyMemory(&pVolInfo->VolumeLabel[0], (PVOID)Label.Buffer,
Label.Length);
RxContext->Info.LengthRemaining -= Label.Length;
if ((ULONG)RxContext->Info.LengthRemaining >= DevExt->VolAttrsLen) {
RtlCopyMemory(RxContext->Info.Buffer, DevExt->VolAttrs,
DevExt->VolAttrsLen);
RxContext->Info.LengthRemaining -= DevExt->VolAttrsLen;
status = STATUS_SUCCESS;
} else {
RxContext->InformationToReturn = DevExt->VolAttrsLen;
status = STATUS_BUFFER_TOO_SMALL;
}
goto out;
}
}
case FileFsDeviceInformation:
{
PFILE_FS_DEVICE_INFORMATION pDevInfo = RxContext->Info.Buffer;
@ -3856,7 +3858,6 @@ NTSTATUS nfs41_QueryVolumeInformation(
RxContext->InformationToReturn = SizeUsed;
goto out;
}
RtlZeroMemory(pDevInfo, SizeUsed);
pDevInfo->DeviceType = RxContext->pFcb->pNetRoot->DeviceType;
pDevInfo->Characteristics = FILE_REMOTE_DEVICE | FILE_DEVICE_IS_MOUNTED;
RxContext->Info.LengthRemaining -= SizeUsed;
@ -5712,6 +5713,8 @@ NTSTATUS DriverEntry(
RxDefineNode(dev_exts, NFS41_DEVICE_EXTENSION);
dev_exts->DeviceObject = nfs41_dev;
nfs41_create_volume_info((PFILE_FS_VOLUME_INFORMATION)dev_exts->VolAttrs,
&dev_exts->VolAttrsLen);
RtlInitUnicodeString(&user_dev_name, NFS41_SHADOW_DEVICE_NAME);
DbgP("calling IoCreateSymbolicLink %wZ %wZ\n", &user_dev_name, &dev_name);