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