reactos/drivers/filesystems/btrfs/fastio.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"
FAST_IO_DISPATCH FastIoDispatch;
_Function_class_(FAST_IO_QUERY_BASIC_INFO)
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static BOOLEAN __stdcall fast_query_basic_info(PFILE_OBJECT FileObject, BOOLEAN wait, PFILE_BASIC_INFORMATION fbi,
PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb;
ccb* ccb;
UNUSED(DeviceObject);
FsRtlEnterFileSystem();
TRACE("(%p, %u, %p, %p, %p)\n", FileObject, wait, fbi, IoStatus, DeviceObject);
if (!FileObject) {
FsRtlExitFileSystem();
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return false;
}
fcb = FileObject->FsContext;
if (!fcb) {
FsRtlExitFileSystem();
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return false;
}
ccb = FileObject->FsContext2;
if (!ccb) {
FsRtlExitFileSystem();
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return false;
}
if (!(ccb->access & (FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES))) {
FsRtlExitFileSystem();
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return false;
}
if (fcb->ads) {
if (!ccb->fileref || !ccb->fileref->parent || !ccb->fileref->parent->fcb) {
FsRtlExitFileSystem();
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return false;
}
fcb = ccb->fileref->parent->fcb;
}
if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
FsRtlExitFileSystem();
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return false;
}
if (fcb == fcb->Vcb->dummy_fcb) {
LARGE_INTEGER time;
KeQuerySystemTime(&time);
fbi->CreationTime = fbi->LastAccessTime = fbi->LastWriteTime = fbi->ChangeTime = time;
} else {
fbi->CreationTime.QuadPart = unix_time_to_win(&fcb->inode_item.otime);
fbi->LastAccessTime.QuadPart = unix_time_to_win(&fcb->inode_item.st_atime);
fbi->LastWriteTime.QuadPart = unix_time_to_win(&fcb->inode_item.st_mtime);
fbi->ChangeTime.QuadPart = unix_time_to_win(&fcb->inode_item.st_ctime);
}
fbi->FileAttributes = fcb->atts == 0 ? FILE_ATTRIBUTE_NORMAL : fcb->atts;
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = sizeof(FILE_BASIC_INFORMATION);
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
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return true;
}
_Function_class_(FAST_IO_QUERY_STANDARD_INFO)
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static BOOLEAN __stdcall fast_query_standard_info(PFILE_OBJECT FileObject, BOOLEAN wait, PFILE_STANDARD_INFORMATION fsi,
PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb;
ccb* ccb;
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bool ads;
ULONG adssize;
UNUSED(DeviceObject);
FsRtlEnterFileSystem();
TRACE("(%p, %u, %p, %p, %p)\n", FileObject, wait, fsi, IoStatus, DeviceObject);
if (!FileObject) {
FsRtlExitFileSystem();
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return false;
}
fcb = FileObject->FsContext;
ccb = FileObject->FsContext2;
if (!fcb) {
FsRtlExitFileSystem();
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return false;
}
if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
FsRtlExitFileSystem();
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return false;
}
ads = fcb->ads;
if (ads) {
struct _fcb* fcb2;
if (!ccb || !ccb->fileref || !ccb->fileref->parent || !ccb->fileref->parent->fcb) {
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
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return false;
}
adssize = fcb->adsdata.Length;
fcb2 = ccb->fileref->parent->fcb;
ExReleaseResourceLite(fcb->Header.Resource);
fcb = fcb2;
if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
FsRtlExitFileSystem();
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return false;
}
fsi->AllocationSize.QuadPart = fsi->EndOfFile.QuadPart = adssize;
fsi->NumberOfLinks = fcb->inode_item.st_nlink;
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fsi->Directory = false;
} else {
fsi->AllocationSize.QuadPart = fcb_alloc_size(fcb);
fsi->EndOfFile.QuadPart = S_ISDIR(fcb->inode_item.st_mode) ? 0 : fcb->inode_item.st_size;
fsi->NumberOfLinks = fcb->inode_item.st_nlink;
fsi->Directory = S_ISDIR(fcb->inode_item.st_mode);
}
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fsi->DeletePending = ccb->fileref ? ccb->fileref->delete_on_close : false;
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = sizeof(FILE_STANDARD_INFORMATION);
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
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return true;
}
_Function_class_(FAST_IO_CHECK_IF_POSSIBLE)
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static BOOLEAN __stdcall fast_io_check_if_possible(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length, BOOLEAN Wait,
ULONG LockKey, BOOLEAN CheckForReadOperation, PIO_STATUS_BLOCK IoStatus,
PDEVICE_OBJECT DeviceObject) {
fcb* fcb = FileObject->FsContext;
LARGE_INTEGER len2;
UNUSED(Wait);
UNUSED(IoStatus);
UNUSED(DeviceObject);
len2.QuadPart = Length;
if (CheckForReadOperation) {
if (FsRtlFastCheckLockForRead(&fcb->lock, FileOffset, &len2, LockKey, FileObject, PsGetCurrentProcess()))
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return true;
} else {
if (!fcb->Vcb->readonly && !is_subvol_readonly(fcb->subvol, NULL) && FsRtlFastCheckLockForWrite(&fcb->lock, FileOffset, &len2, LockKey, FileObject, PsGetCurrentProcess()))
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return true;
}
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return false;
}
_Function_class_(FAST_IO_QUERY_NETWORK_OPEN_INFO)
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static BOOLEAN __stdcall fast_io_query_network_open_info(PFILE_OBJECT FileObject, BOOLEAN Wait, FILE_NETWORK_OPEN_INFORMATION* fnoi,
PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb;
ccb* ccb;
file_ref* fileref;
UNUSED(Wait);
UNUSED(IoStatus); // FIXME - really? What about IoStatus->Information?
UNUSED(DeviceObject);
FsRtlEnterFileSystem();
TRACE("(%p, %u, %p, %p, %p)\n", FileObject, Wait, fnoi, IoStatus, DeviceObject);
RtlZeroMemory(fnoi, sizeof(FILE_NETWORK_OPEN_INFORMATION));
fcb = FileObject->FsContext;
if (!fcb || fcb == fcb->Vcb->volume_fcb) {
FsRtlExitFileSystem();
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return false;
}
ccb = FileObject->FsContext2;
if (!ccb) {
FsRtlExitFileSystem();
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return false;
}
fileref = ccb->fileref;
if (fcb == fcb->Vcb->dummy_fcb) {
LARGE_INTEGER time;
KeQuerySystemTime(&time);
fnoi->CreationTime = fnoi->LastAccessTime = fnoi->LastWriteTime = fnoi->ChangeTime = time;
} else {
INODE_ITEM* ii;
if (fcb->ads) {
if (!fileref || !fileref->parent) {
ERR("no fileref for stream\n");
FsRtlExitFileSystem();
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return false;
}
ii = &fileref->parent->fcb->inode_item;
} else
ii = &fcb->inode_item;
fnoi->CreationTime.QuadPart = unix_time_to_win(&ii->otime);
fnoi->LastAccessTime.QuadPart = unix_time_to_win(&ii->st_atime);
fnoi->LastWriteTime.QuadPart = unix_time_to_win(&ii->st_mtime);
fnoi->ChangeTime.QuadPart = unix_time_to_win(&ii->st_ctime);
}
if (fcb->ads) {
fnoi->AllocationSize.QuadPart = fnoi->EndOfFile.QuadPart = fcb->adsdata.Length;
fnoi->FileAttributes = fileref->parent->fcb->atts == 0 ? FILE_ATTRIBUTE_NORMAL : fileref->parent->fcb->atts;
} else {
fnoi->AllocationSize.QuadPart = fcb_alloc_size(fcb);
fnoi->EndOfFile.QuadPart = S_ISDIR(fcb->inode_item.st_mode) ? 0 : fcb->inode_item.st_size;
fnoi->FileAttributes = fcb->atts == 0 ? FILE_ATTRIBUTE_NORMAL : fcb->atts;
}
FsRtlExitFileSystem();
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return true;
}
_Function_class_(FAST_IO_ACQUIRE_FOR_MOD_WRITE)
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static NTSTATUS __stdcall fast_io_acquire_for_mod_write(PFILE_OBJECT FileObject, PLARGE_INTEGER EndingOffset,
struct _ERESOURCE **ResourceToRelease, PDEVICE_OBJECT DeviceObject) {
fcb* fcb;
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TRACE("(%p, %I64x, %p, %p)\n", FileObject, EndingOffset ? EndingOffset->QuadPart : 0, ResourceToRelease, DeviceObject);
UNUSED(EndingOffset);
UNUSED(DeviceObject);
fcb = FileObject->FsContext;
if (!fcb)
return STATUS_INVALID_PARAMETER;
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// Make sure we don't get interrupted by the flush thread, which can cause a deadlock
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if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, false))
return STATUS_CANT_WAIT;
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if (!ExAcquireResourceExclusiveLite(fcb->Header.Resource, false)) {
ExReleaseResourceLite(&fcb->Vcb->tree_lock);
TRACE("returning STATUS_CANT_WAIT\n");
return STATUS_CANT_WAIT;
}
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// Ideally this would be PagingIoResource, but that doesn't play well with copy-on-write,
// as we can't guarantee that we won't need to do any reallocations.
*ResourceToRelease = fcb->Header.Resource;
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TRACE("returning STATUS_SUCCESS\n");
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return STATUS_SUCCESS;
}
_Function_class_(FAST_IO_RELEASE_FOR_MOD_WRITE)
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static NTSTATUS __stdcall fast_io_release_for_mod_write(PFILE_OBJECT FileObject, struct _ERESOURCE *ResourceToRelease,
PDEVICE_OBJECT DeviceObject) {
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fcb* fcb;
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TRACE("(%p, %p, %p)\n", FileObject, ResourceToRelease, DeviceObject);
UNUSED(DeviceObject);
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fcb = FileObject->FsContext;
ExReleaseResourceLite(ResourceToRelease);
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ExReleaseResourceLite(&fcb->Vcb->tree_lock);
return STATUS_SUCCESS;
}
_Function_class_(FAST_IO_ACQUIRE_FOR_CCFLUSH)
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static NTSTATUS __stdcall fast_io_acquire_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
UNUSED(FileObject);
UNUSED(DeviceObject);
IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
return STATUS_SUCCESS;
}
_Function_class_(FAST_IO_RELEASE_FOR_CCFLUSH)
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static NTSTATUS __stdcall fast_io_release_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
UNUSED(FileObject);
UNUSED(DeviceObject);
if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
IoSetTopLevelIrp(NULL);
return STATUS_SUCCESS;
}
_Function_class_(FAST_IO_WRITE)
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static BOOLEAN __stdcall fast_io_write(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length, BOOLEAN Wait, ULONG LockKey, PVOID Buffer, PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
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fcb* fcb = FileObject->FsContext;
bool ret;
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FsRtlEnterFileSystem();
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if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, Wait)) {
FsRtlExitFileSystem();
return false;
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}
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ret = FsRtlCopyWrite(FileObject, FileOffset, Length, Wait, LockKey, Buffer, IoStatus, DeviceObject);
if (ret)
fcb->inode_item.st_size = fcb->Header.FileSize.QuadPart;
ExReleaseResourceLite(&fcb->Vcb->tree_lock);
FsRtlExitFileSystem();
return ret;
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}
_Function_class_(FAST_IO_LOCK)
static BOOLEAN __stdcall fast_io_lock(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, PLARGE_INTEGER Length, PEPROCESS ProcessId,
ULONG Key, BOOLEAN FailImmediately, BOOLEAN ExclusiveLock, PIO_STATUS_BLOCK IoStatus,
PDEVICE_OBJECT DeviceObject) {
BOOLEAN ret;
fcb* fcb = FileObject->FsContext;
UNUSED(DeviceObject);
TRACE("(%p, %I64x, %I64x, %p, %lx, %u, %u, %p, %p)\n", FileObject, FileOffset ? FileOffset->QuadPart : 0, Length ? Length->QuadPart : 0,
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ProcessId, Key, FailImmediately, ExclusiveLock, IoStatus, DeviceObject);
if (fcb->type != BTRFS_TYPE_FILE) {
WARN("can only lock files\n");
IoStatus->Status = STATUS_INVALID_PARAMETER;
IoStatus->Information = 0;
return true;
}
FsRtlEnterFileSystem();
ExAcquireResourceSharedLite(fcb->Header.Resource, true);
ret = FsRtlFastLock(&fcb->lock, FileObject, FileOffset, Length, ProcessId, Key, FailImmediately,
ExclusiveLock, IoStatus, NULL, false);
if (ret)
fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
return ret;
}
_Function_class_(FAST_IO_UNLOCK_SINGLE)
static BOOLEAN __stdcall fast_io_unlock_single(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, PLARGE_INTEGER Length, PEPROCESS ProcessId,
ULONG Key, PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb = FileObject->FsContext;
UNUSED(DeviceObject);
TRACE("(%p, %I64x, %I64x, %p, %lx, %p, %p)\n", FileObject, FileOffset ? FileOffset->QuadPart : 0, Length ? Length->QuadPart : 0,
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ProcessId, Key, IoStatus, DeviceObject);
IoStatus->Information = 0;
if (fcb->type != BTRFS_TYPE_FILE) {
WARN("can only lock files\n");
IoStatus->Status = STATUS_INVALID_PARAMETER;
return true;
}
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FsRtlEnterFileSystem();
IoStatus->Status = FsRtlFastUnlockSingle(&fcb->lock, FileObject, FileOffset, Length, ProcessId, Key, NULL, false);
fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
FsRtlExitFileSystem();
return true;
}
_Function_class_(FAST_IO_UNLOCK_ALL)
static BOOLEAN __stdcall fast_io_unlock_all(PFILE_OBJECT FileObject, PEPROCESS ProcessId, PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb = FileObject->FsContext;
UNUSED(DeviceObject);
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TRACE("(%p, %p, %p, %p)\n", FileObject, ProcessId, IoStatus, DeviceObject);
IoStatus->Information = 0;
if (fcb->type != BTRFS_TYPE_FILE) {
WARN("can only lock files\n");
IoStatus->Status = STATUS_INVALID_PARAMETER;
return true;
}
FsRtlEnterFileSystem();
ExAcquireResourceSharedLite(fcb->Header.Resource, true);
IoStatus->Status = FsRtlFastUnlockAll(&fcb->lock, FileObject, ProcessId, NULL);
fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
return true;
}
_Function_class_(FAST_IO_UNLOCK_ALL_BY_KEY)
static BOOLEAN __stdcall fast_io_unlock_all_by_key(PFILE_OBJECT FileObject, PVOID ProcessId, ULONG Key,
PIO_STATUS_BLOCK IoStatus, PDEVICE_OBJECT DeviceObject) {
fcb* fcb = FileObject->FsContext;
UNUSED(DeviceObject);
TRACE("(%p, %p, %lx, %p, %p)\n", FileObject, ProcessId, Key, IoStatus, DeviceObject);
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IoStatus->Information = 0;
if (fcb->type != BTRFS_TYPE_FILE) {
WARN("can only lock files\n");
IoStatus->Status = STATUS_INVALID_PARAMETER;
return true;
}
FsRtlEnterFileSystem();
ExAcquireResourceSharedLite(fcb->Header.Resource, true);
IoStatus->Status = FsRtlFastUnlockAllByKey(&fcb->lock, FileObject, ProcessId, Key, NULL);
fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
ExReleaseResourceLite(fcb->Header.Resource);
FsRtlExitFileSystem();
return true;
}
#ifdef __REACTOS__
_Function_class_(FAST_IO_ACQUIRE_FILE)
#endif /* __REACTOS__ */
static void __stdcall fast_io_acquire_for_create_section(_In_ PFILE_OBJECT FileObject) {
fcb* fcb;
TRACE("(%p)\n", FileObject);
if (!FileObject)
return;
fcb = FileObject->FsContext;
if (!fcb)
return;
ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, true);
ExAcquireResourceExclusiveLite(fcb->Header.Resource, true);
}
#ifdef __REACTOS__
_Function_class_(FAST_IO_RELEASE_FILE)
#endif /* __REACTOS__ */
static void __stdcall fast_io_release_for_create_section(_In_ PFILE_OBJECT FileObject) {
fcb* fcb;
TRACE("(%p)\n", FileObject);
if (!FileObject)
return;
fcb = FileObject->FsContext;
if (!fcb)
return;
ExReleaseResourceLite(fcb->Header.Resource);
ExReleaseResourceLite(&fcb->Vcb->tree_lock);
}
void init_fast_io_dispatch(FAST_IO_DISPATCH** fiod) {
RtlZeroMemory(&FastIoDispatch, sizeof(FastIoDispatch));
FastIoDispatch.SizeOfFastIoDispatch = sizeof(FAST_IO_DISPATCH);
FastIoDispatch.FastIoCheckIfPossible = fast_io_check_if_possible;
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FastIoDispatch.FastIoRead = FsRtlCopyRead;
FastIoDispatch.FastIoWrite = fast_io_write;
FastIoDispatch.FastIoQueryBasicInfo = fast_query_basic_info;
FastIoDispatch.FastIoQueryStandardInfo = fast_query_standard_info;
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FastIoDispatch.FastIoLock = fast_io_lock;
FastIoDispatch.FastIoUnlockSingle = fast_io_unlock_single;
FastIoDispatch.FastIoUnlockAll = fast_io_unlock_all;
FastIoDispatch.FastIoUnlockAllByKey = fast_io_unlock_all_by_key;
FastIoDispatch.AcquireFileForNtCreateSection = fast_io_acquire_for_create_section;
FastIoDispatch.ReleaseFileForNtCreateSection = fast_io_release_for_create_section;
FastIoDispatch.FastIoQueryNetworkOpenInfo = fast_io_query_network_open_info;
FastIoDispatch.AcquireForModWrite = fast_io_acquire_for_mod_write;
FastIoDispatch.MdlRead = FsRtlMdlReadDev;
FastIoDispatch.MdlReadComplete = FsRtlMdlReadCompleteDev;
FastIoDispatch.PrepareMdlWrite = FsRtlPrepareMdlWriteDev;
FastIoDispatch.MdlWriteComplete = FsRtlMdlWriteCompleteDev;
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FastIoDispatch.ReleaseForModWrite = fast_io_release_for_mod_write;
FastIoDispatch.AcquireForCcFlush = fast_io_acquire_for_ccflush;
FastIoDispatch.ReleaseForCcFlush = fast_io_release_for_ccflush;
*fiod = &FastIoDispatch;
}