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reactos/drivers/filesystems/btrfs/dirctrl.c
Pierre Schweitzer 4672b2ba5e [BTRFS] Upgrade to BtrFS 1.0.1 
CID 1419459, 1419378

CORE-13896
2017-10-16 20:29:55 +02:00

1062 lines
35 KiB
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"
enum DirEntryType {
DirEntryType_File,
DirEntryType_Self,
DirEntryType_Parent
};
typedef struct {
KEY key;
UNICODE_STRING name;
UINT8 type;
enum DirEntryType dir_entry_type;
dir_child* dc;
} dir_entry;
ULONG get_reparse_tag(device_extension* Vcb, root* subvol, UINT64 inode, UINT8 type, ULONG atts, BOOL lxss, PIRP Irp) {
fcb* fcb;
ULONG tag = 0, br;
NTSTATUS Status;
if (type == BTRFS_TYPE_SYMLINK) {
if (lxss)
return IO_REPARSE_TAG_LXSS_SYMLINK;
else
return IO_REPARSE_TAG_SYMLINK;
}
if (type != BTRFS_TYPE_FILE && type != BTRFS_TYPE_DIRECTORY)
return 0;
if (!(atts & FILE_ATTRIBUTE_REPARSE_POINT))
return 0;
Status = open_fcb(Vcb, subvol, inode, type, NULL, NULL, &fcb, PagedPool, Irp);
if (!NT_SUCCESS(Status)) {
ERR("open_fcb returned %08x\n", Status);
return 0;
}
ExAcquireResourceSharedLite(fcb->Header.Resource, TRUE);
if (type == BTRFS_TYPE_DIRECTORY) {
if (!fcb->reparse_xattr.Buffer || fcb->reparse_xattr.Length < sizeof(ULONG))
goto end;
RtlCopyMemory(&tag, fcb->reparse_xattr.Buffer, sizeof(ULONG));
} else {
Status = read_file(fcb, (UINT8*)&tag, 0, sizeof(ULONG), &br, NULL);
if (!NT_SUCCESS(Status)) {
ERR("read_file returned %08x\n", Status);
goto end;
}
if (br < sizeof(ULONG))
goto end;
}
end:
ExReleaseResourceLite(fcb->Header.Resource);
free_fcb(Vcb, fcb);
return tag;
}
static ULONG get_ea_len(device_extension* Vcb, root* subvol, UINT64 inode, PIRP Irp) {
UINT8* eadata;
UINT16 len;
if (get_xattr(Vcb, subvol, inode, EA_EA, EA_EA_HASH, &eadata, &len, Irp)) {
ULONG offset;
NTSTATUS Status;
Status = IoCheckEaBufferValidity((FILE_FULL_EA_INFORMATION*)eadata, len, &offset);
if (!NT_SUCCESS(Status)) {
WARN("IoCheckEaBufferValidity returned %08x (error at offset %u)\n", Status, offset);
ExFreePool(eadata);
return 0;
} else {
FILE_FULL_EA_INFORMATION* eainfo;
ULONG ealen;
ealen = 4;
eainfo = (FILE_FULL_EA_INFORMATION*)eadata;
do {
ealen += 5 + eainfo->EaNameLength + eainfo->EaValueLength;
if (eainfo->NextEntryOffset == 0)
break;
eainfo = (FILE_FULL_EA_INFORMATION*)(((UINT8*)eainfo) + eainfo->NextEntryOffset);
} while (TRUE);
ExFreePool(eadata);
return ealen;
}
} else
return 0;
}
static NTSTATUS query_dir_item(fcb* fcb, ccb* ccb, void* buf, LONG* len, PIRP Irp, dir_entry* de, root* r) {
PIO_STACK_LOCATION IrpSp;
LONG needed;
UINT64 inode;
INODE_ITEM ii;
NTSTATUS Status;
ULONG atts = 0, ealen = 0;
file_ref* fileref = ccb->fileref;
IrpSp = IoGetCurrentIrpStackLocation(Irp);
if (de->key.obj_type == TYPE_ROOT_ITEM) { // subvol
LIST_ENTRY* le;
r = NULL;
le = fcb->Vcb->roots.Flink;
while (le != &fcb->Vcb->roots) {
root* subvol = CONTAINING_RECORD(le, root, list_entry);
if (subvol->id == de->key.obj_id) {
r = subvol;
break;
}
le = le->Flink;
}
if (r && r->parent != fcb->subvol->id)
r = NULL;
inode = SUBVOL_ROOT_INODE;
} else {
inode = de->key.obj_id;
}
if (IrpSp->Parameters.QueryDirectory.FileInformationClass != FileNamesInformation) { // FIXME - object ID and reparse point classes too?
switch (de->dir_entry_type) {
case DirEntryType_File:
{
if (!r) {
LARGE_INTEGER time;
ii = fcb->Vcb->dummy_fcb->inode_item;
atts = fcb->Vcb->dummy_fcb->atts;
ealen = fcb->Vcb->dummy_fcb->ealen;
KeQuerySystemTime(&time);
win_time_to_unix(time, &ii.otime);
ii.st_atime = ii.st_mtime = ii.st_ctime = ii.otime;
} else {
BOOL found = FALSE;
if (de->dc && de->dc->fileref && de->dc->fileref->fcb) {
ii = de->dc->fileref->fcb->inode_item;
atts = de->dc->fileref->fcb->atts;
ealen = de->dc->fileref->fcb->ealen;
found = TRUE;
}
if (!found) {
KEY searchkey;
traverse_ptr tp;
searchkey.obj_id = inode;
searchkey.obj_type = TYPE_INODE_ITEM;
searchkey.offset = 0xffffffffffffffff;
Status = find_item(fcb->Vcb, r, &tp, &searchkey, FALSE, Irp);
if (!NT_SUCCESS(Status)) {
ERR("error - find_item returned %08x\n", Status);
return Status;
}
if (tp.item->key.obj_id != searchkey.obj_id || tp.item->key.obj_type != searchkey.obj_type) {
ERR("could not find inode item for inode %llx in root %llx\n", inode, r->id);
return STATUS_INTERNAL_ERROR;
}
RtlZeroMemory(&ii, sizeof(INODE_ITEM));
if (tp.item->size > 0)
RtlCopyMemory(&ii, tp.item->data, min(sizeof(INODE_ITEM), tp.item->size));
if (IrpSp->Parameters.QueryDirectory.FileInformationClass == FileBothDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileFullDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileIdBothDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileIdFullDirectoryInformation) {
BOOL dotfile = de->name.Length > sizeof(WCHAR) && de->name.Buffer[0] == '.';
atts = get_file_attributes(fcb->Vcb, r, inode, de->type, dotfile, FALSE, Irp);
}
if (IrpSp->Parameters.QueryDirectory.FileInformationClass == FileBothDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileFullDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileIdBothDirectoryInformation ||
IrpSp->Parameters.QueryDirectory.FileInformationClass == FileIdFullDirectoryInformation) {
ealen = get_ea_len(fcb->Vcb, r, inode, Irp);
}
}
}
break;
}
case DirEntryType_Self:
ii = fcb->inode_item;
r = fcb->subvol;
inode = fcb->inode;
atts = fcb->atts;
ealen = fcb->ealen;
break;
case DirEntryType_Parent:
if (fileref && fileref->parent) {
ii = fileref->parent->fcb->inode_item;
r = fileref->parent->fcb->subvol;
inode = fileref->parent->fcb->inode;
atts = fileref->parent->fcb->atts;
ealen = fileref->parent->fcb->ealen;
} else {
ERR("no fileref\n");
return STATUS_INTERNAL_ERROR;
}
break;
}
if (atts == 0)
atts = FILE_ATTRIBUTE_NORMAL;
}
switch (IrpSp->Parameters.QueryDirectory.FileInformationClass) {
case FileBothDirectoryInformation:
{
FILE_BOTH_DIR_INFORMATION* fbdi = buf;
TRACE("FileBothDirectoryInformation\n");
needed = sizeof(FILE_BOTH_DIR_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
fbdi->NextEntryOffset = 0;
fbdi->FileIndex = 0;
fbdi->CreationTime.QuadPart = unix_time_to_win(&ii.otime);
fbdi->LastAccessTime.QuadPart = unix_time_to_win(&ii.st_atime);
fbdi->LastWriteTime.QuadPart = unix_time_to_win(&ii.st_mtime);
fbdi->ChangeTime.QuadPart = unix_time_to_win(&ii.st_ctime);
fbdi->EndOfFile.QuadPart = de->type == BTRFS_TYPE_SYMLINK ? 0 : ii.st_size;
if (de->type == BTRFS_TYPE_SYMLINK)
fbdi->AllocationSize.QuadPart = 0;
else if (atts & FILE_ATTRIBUTE_SPARSE_FILE)
fbdi->AllocationSize.QuadPart = ii.st_blocks;
else
fbdi->AllocationSize.QuadPart = sector_align(ii.st_size, fcb->Vcb->superblock.sector_size);
fbdi->FileAttributes = atts;
fbdi->FileNameLength = de->name.Length;
fbdi->EaSize = (r && atts & FILE_ATTRIBUTE_REPARSE_POINT) ? get_reparse_tag(fcb->Vcb, r, inode, de->type, atts, ccb->lxss, Irp) : ealen;
fbdi->ShortNameLength = 0;
RtlCopyMemory(fbdi->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileDirectoryInformation:
{
FILE_DIRECTORY_INFORMATION* fdi = buf;
TRACE("FileDirectoryInformation\n");
needed = sizeof(FILE_DIRECTORY_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
fdi->NextEntryOffset = 0;
fdi->FileIndex = 0;
fdi->CreationTime.QuadPart = unix_time_to_win(&ii.otime);
fdi->LastAccessTime.QuadPart = unix_time_to_win(&ii.st_atime);
fdi->LastWriteTime.QuadPart = unix_time_to_win(&ii.st_mtime);
fdi->ChangeTime.QuadPart = unix_time_to_win(&ii.st_ctime);
fdi->EndOfFile.QuadPart = de->type == BTRFS_TYPE_SYMLINK ? 0 : ii.st_size;
if (de->type == BTRFS_TYPE_SYMLINK)
fdi->AllocationSize.QuadPart = 0;
else if (atts & FILE_ATTRIBUTE_SPARSE_FILE)
fdi->AllocationSize.QuadPart = ii.st_blocks;
else
fdi->AllocationSize.QuadPart = sector_align(ii.st_size, fcb->Vcb->superblock.sector_size);
fdi->FileAttributes = atts;
fdi->FileNameLength = de->name.Length;
RtlCopyMemory(fdi->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileFullDirectoryInformation:
{
FILE_FULL_DIR_INFORMATION* ffdi = buf;
TRACE("FileFullDirectoryInformation\n");
needed = sizeof(FILE_FULL_DIR_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
ffdi->NextEntryOffset = 0;
ffdi->FileIndex = 0;
ffdi->CreationTime.QuadPart = unix_time_to_win(&ii.otime);
ffdi->LastAccessTime.QuadPart = unix_time_to_win(&ii.st_atime);
ffdi->LastWriteTime.QuadPart = unix_time_to_win(&ii.st_mtime);
ffdi->ChangeTime.QuadPart = unix_time_to_win(&ii.st_ctime);
ffdi->EndOfFile.QuadPart = de->type == BTRFS_TYPE_SYMLINK ? 0 : ii.st_size;
if (de->type == BTRFS_TYPE_SYMLINK)
ffdi->AllocationSize.QuadPart = 0;
else if (atts & FILE_ATTRIBUTE_SPARSE_FILE)
ffdi->AllocationSize.QuadPart = ii.st_blocks;
else
ffdi->AllocationSize.QuadPart = sector_align(ii.st_size, fcb->Vcb->superblock.sector_size);
ffdi->FileAttributes = atts;
ffdi->FileNameLength = de->name.Length;
ffdi->EaSize = (r && atts & FILE_ATTRIBUTE_REPARSE_POINT) ? get_reparse_tag(fcb->Vcb, r, inode, de->type, atts, ccb->lxss, Irp) : ealen;
RtlCopyMemory(ffdi->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileIdBothDirectoryInformation:
{
FILE_ID_BOTH_DIR_INFORMATION* fibdi = buf;
TRACE("FileIdBothDirectoryInformation\n");
needed = sizeof(FILE_ID_BOTH_DIR_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
fibdi->NextEntryOffset = 0;
fibdi->FileIndex = 0;
fibdi->CreationTime.QuadPart = unix_time_to_win(&ii.otime);
fibdi->LastAccessTime.QuadPart = unix_time_to_win(&ii.st_atime);
fibdi->LastWriteTime.QuadPart = unix_time_to_win(&ii.st_mtime);
fibdi->ChangeTime.QuadPart = unix_time_to_win(&ii.st_ctime);
fibdi->EndOfFile.QuadPart = de->type == BTRFS_TYPE_SYMLINK ? 0 : ii.st_size;
if (de->type == BTRFS_TYPE_SYMLINK)
fibdi->AllocationSize.QuadPart = 0;
else if (atts & FILE_ATTRIBUTE_SPARSE_FILE)
fibdi->AllocationSize.QuadPart = ii.st_blocks;
else
fibdi->AllocationSize.QuadPart = sector_align(ii.st_size, fcb->Vcb->superblock.sector_size);
fibdi->FileAttributes = atts;
fibdi->FileNameLength = de->name.Length;
fibdi->EaSize = (r && atts & FILE_ATTRIBUTE_REPARSE_POINT) ? get_reparse_tag(fcb->Vcb, r, inode, de->type, atts, ccb->lxss, Irp) : ealen;
fibdi->ShortNameLength = 0;
fibdi->FileId.QuadPart = r ? make_file_id(r, inode) : make_file_id(fcb->Vcb->dummy_fcb->subvol, fcb->Vcb->dummy_fcb->inode);
RtlCopyMemory(fibdi->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileIdFullDirectoryInformation:
{
FILE_ID_FULL_DIR_INFORMATION* fifdi = buf;
TRACE("FileIdFullDirectoryInformation\n");
needed = sizeof(FILE_ID_FULL_DIR_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
fifdi->NextEntryOffset = 0;
fifdi->FileIndex = 0;
fifdi->CreationTime.QuadPart = unix_time_to_win(&ii.otime);
fifdi->LastAccessTime.QuadPart = unix_time_to_win(&ii.st_atime);
fifdi->LastWriteTime.QuadPart = unix_time_to_win(&ii.st_mtime);
fifdi->ChangeTime.QuadPart = unix_time_to_win(&ii.st_ctime);
fifdi->EndOfFile.QuadPart = de->type == BTRFS_TYPE_SYMLINK ? 0 : ii.st_size;
if (de->type == BTRFS_TYPE_SYMLINK)
fifdi->AllocationSize.QuadPart = 0;
else if (atts & FILE_ATTRIBUTE_SPARSE_FILE)
fifdi->AllocationSize.QuadPart = ii.st_blocks;
else
fifdi->AllocationSize.QuadPart = sector_align(ii.st_size, fcb->Vcb->superblock.sector_size);
fifdi->FileAttributes = atts;
fifdi->FileNameLength = de->name.Length;
fifdi->EaSize = (r && atts & FILE_ATTRIBUTE_REPARSE_POINT) ? get_reparse_tag(fcb->Vcb, r, inode, de->type, atts, ccb->lxss, Irp) : ealen;
fifdi->FileId.QuadPart = r ? make_file_id(r, inode) : make_file_id(fcb->Vcb->dummy_fcb->subvol, fcb->Vcb->dummy_fcb->inode);
RtlCopyMemory(fifdi->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileNamesInformation:
{
FILE_NAMES_INFORMATION* fni = buf;
TRACE("FileNamesInformation\n");
needed = sizeof(FILE_NAMES_INFORMATION) - sizeof(WCHAR) + de->name.Length;
if (needed > *len) {
TRACE("buffer overflow - %u > %u\n", needed, *len);
return STATUS_BUFFER_OVERFLOW;
}
fni->NextEntryOffset = 0;
fni->FileIndex = 0;
fni->FileNameLength = de->name.Length;
RtlCopyMemory(fni->FileName, de->name.Buffer, de->name.Length);
*len -= needed;
return STATUS_SUCCESS;
}
case FileObjectIdInformation:
FIXME("STUB: FileObjectIdInformation\n");
return STATUS_NOT_IMPLEMENTED;
case FileQuotaInformation:
FIXME("STUB: FileQuotaInformation\n");
return STATUS_NOT_IMPLEMENTED;
case FileReparsePointInformation:
FIXME("STUB: FileReparsePointInformation\n");
return STATUS_NOT_IMPLEMENTED;
default:
WARN("Unknown FileInformationClass %u\n", IrpSp->Parameters.QueryDirectory.FileInformationClass);
return STATUS_NOT_IMPLEMENTED;
}
return STATUS_NO_MORE_FILES;
}
static NTSTATUS next_dir_entry(file_ref* fileref, UINT64* offset, dir_entry* de, dir_child** pdc) {
LIST_ENTRY* le;
dir_child* dc;
if (*pdc) {
dir_child* dc2 = *pdc;
if (dc2->list_entry_index.Flink != &fileref->fcb->dir_children_index)
dc = CONTAINING_RECORD(dc2->list_entry_index.Flink, dir_child, list_entry_index);
else
dc = NULL;
goto next;
}
if (fileref->parent) { // don't return . and .. if root directory
if (*offset == 0) {
de->key.obj_id = fileref->fcb->inode;
de->key.obj_type = TYPE_INODE_ITEM;
de->key.offset = 0;
de->dir_entry_type = DirEntryType_Self;
de->name.Buffer = L".";
de->name.Length = de->name.MaximumLength = sizeof(WCHAR);
de->type = BTRFS_TYPE_DIRECTORY;
*offset = 1;
*pdc = NULL;
return STATUS_SUCCESS;
} else if (*offset == 1) {
de->key.obj_id = fileref->parent->fcb->inode;
de->key.obj_type = TYPE_INODE_ITEM;
de->key.offset = 0;
de->dir_entry_type = DirEntryType_Parent;
de->name.Buffer = L"..";
de->name.Length = de->name.MaximumLength = sizeof(WCHAR) * 2;
de->type = BTRFS_TYPE_DIRECTORY;
*offset = 2;
*pdc = NULL;
return STATUS_SUCCESS;
}
}
if (*offset < 2)
*offset = 2;
dc = NULL;
le = fileref->fcb->dir_children_index.Flink;
// skip entries before offset
while (le != &fileref->fcb->dir_children_index) {
dir_child* dc2 = CONTAINING_RECORD(le, dir_child, list_entry_index);
if (dc2->index >= *offset) {
dc = dc2;
break;
}
le = le->Flink;
}
next:
if (!dc)
return STATUS_NO_MORE_FILES;
de->key = dc->key;
de->name = dc->name;
de->type = dc->type;
de->dir_entry_type = DirEntryType_File;
de->dc = dc;
*offset = dc->index + 1;
*pdc = dc;
return STATUS_SUCCESS;
}
static NTSTATUS query_directory(PIRP Irp) {
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status, status2;
fcb* fcb;
ccb* ccb;
file_ref* fileref;
device_extension* Vcb;
void* buf;
UINT8 *curitem, *lastitem;
LONG length;
ULONG count;
BOOL has_wildcard = FALSE, specific_file = FALSE, initial;
dir_entry de;
UINT64 newoffset;
ANSI_STRING utf8;
dir_child* dc = NULL;
TRACE("query directory\n");
IrpSp = IoGetCurrentIrpStackLocation(Irp);
fcb = IrpSp->FileObject->FsContext;
ccb = IrpSp->FileObject->FsContext2;
fileref = ccb ? ccb->fileref : NULL;
utf8.Buffer = NULL;
if (!fileref)
return STATUS_INVALID_PARAMETER;
if (!ccb) {
ERR("ccb was NULL\n");
return STATUS_INVALID_PARAMETER;
}
if (!fcb) {
ERR("fcb was NULL\n");
return STATUS_INVALID_PARAMETER;
}
if (Irp->RequestorMode == UserMode && !(ccb->access & FILE_LIST_DIRECTORY)) {
WARN("insufficient privileges\n");
return STATUS_ACCESS_DENIED;
}
Vcb = fcb->Vcb;
if (!Vcb) {
ERR("Vcb was NULL\n");
return STATUS_INVALID_PARAMETER;
}
if (fileref->fcb == Vcb->dummy_fcb)
return STATUS_NO_MORE_FILES;
ExAcquireResourceSharedLite(&Vcb->tree_lock, TRUE);
acquire_fcb_lock_shared(Vcb);
TRACE("%S\n", file_desc(IrpSp->FileObject));
if (IrpSp->Flags == 0) {
TRACE("QD flags: (none)\n");
} else {
ULONG flags = IrpSp->Flags;
TRACE("QD flags:\n");
if (flags & SL_INDEX_SPECIFIED) {
TRACE(" SL_INDEX_SPECIFIED\n");
flags &= ~SL_INDEX_SPECIFIED;
}
if (flags & SL_RESTART_SCAN) {
TRACE(" SL_RESTART_SCAN\n");
flags &= ~SL_RESTART_SCAN;
}
if (flags & SL_RETURN_SINGLE_ENTRY) {
TRACE(" SL_RETURN_SINGLE_ENTRY\n");
flags &= ~SL_RETURN_SINGLE_ENTRY;
}
if (flags != 0)
TRACE(" unknown flags: %u\n", flags);
}
if (IrpSp->Flags & SL_RESTART_SCAN) {
ccb->query_dir_offset = 0;
if (ccb->query_string.Buffer) {
RtlFreeUnicodeString(&ccb->query_string);
ccb->query_string.Buffer = NULL;
}
ccb->has_wildcard = FALSE;
ccb->specific_file = FALSE;
}
initial = !ccb->query_string.Buffer;
if (IrpSp->Parameters.QueryDirectory.FileName && IrpSp->Parameters.QueryDirectory.FileName->Length > 1) {
TRACE("QD filename: %.*S\n", IrpSp->Parameters.QueryDirectory.FileName->Length / sizeof(WCHAR), IrpSp->Parameters.QueryDirectory.FileName->Buffer);
if (IrpSp->Parameters.QueryDirectory.FileName->Buffer[0] != '*') {
specific_file = TRUE;
if (FsRtlDoesNameContainWildCards(IrpSp->Parameters.QueryDirectory.FileName)) {
has_wildcard = TRUE;
specific_file = FALSE;
}
}
if (ccb->query_string.Buffer)
RtlFreeUnicodeString(&ccb->query_string);
if (has_wildcard)
RtlUpcaseUnicodeString(&ccb->query_string, IrpSp->Parameters.QueryDirectory.FileName, TRUE);
else {
ccb->query_string.Buffer = ExAllocatePoolWithTag(PagedPool, IrpSp->Parameters.QueryDirectory.FileName->Length, ALLOC_TAG);
if (!ccb->query_string.Buffer) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end2;
}
ccb->query_string.Length = ccb->query_string.MaximumLength = IrpSp->Parameters.QueryDirectory.FileName->Length;
RtlCopyMemory(ccb->query_string.Buffer, IrpSp->Parameters.QueryDirectory.FileName->Buffer, IrpSp->Parameters.QueryDirectory.FileName->Length);
}
ccb->has_wildcard = has_wildcard;
ccb->specific_file = specific_file;
} else {
has_wildcard = ccb->has_wildcard;
specific_file = ccb->specific_file;
if (!(IrpSp->Flags & SL_RESTART_SCAN)) {
initial = FALSE;
if (specific_file) {
Status = STATUS_NO_MORE_FILES;
goto end2;
}
}
}
if (ccb->query_string.Buffer) {
TRACE("query string = %.*S\n", ccb->query_string.Length / sizeof(WCHAR), ccb->query_string.Buffer);
}
newoffset = ccb->query_dir_offset;
ExAcquireResourceSharedLite(&fileref->fcb->nonpaged->dir_children_lock, TRUE);
Status = next_dir_entry(fileref, &newoffset, &de, &dc);
if (!NT_SUCCESS(Status)) {
if (Status == STATUS_NO_MORE_FILES && initial)
Status = STATUS_NO_SUCH_FILE;
goto end;
}
ccb->query_dir_offset = newoffset;
buf = map_user_buffer(Irp, NormalPagePriority);
if (Irp->MdlAddress && !buf) {
ERR("MmGetSystemAddressForMdlSafe returned NULL\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
length = IrpSp->Parameters.QueryDirectory.Length;
if (specific_file) {
BOOL found = FALSE;
UNICODE_STRING us;
LIST_ENTRY* le;
UINT32 hash;
UINT8 c;
us.Buffer = NULL;
if (!ccb->case_sensitive) {
Status = RtlUpcaseUnicodeString(&us, &ccb->query_string, TRUE);
if (!NT_SUCCESS(Status)) {
ERR("RtlUpcaseUnicodeString returned %08x\n", Status);
goto end;
}
hash = calc_crc32c(0xffffffff, (UINT8*)us.Buffer, us.Length);
} else
hash = calc_crc32c(0xffffffff, (UINT8*)ccb->query_string.Buffer, ccb->query_string.Length);
c = hash >> 24;
if (ccb->case_sensitive) {
if (fileref->fcb->hash_ptrs[c]) {
le = fileref->fcb->hash_ptrs[c];
while (le != &fileref->fcb->dir_children_hash) {
dir_child* dc2 = CONTAINING_RECORD(le, dir_child, list_entry_hash);
if (dc2->hash == hash) {
if (dc2->name.Length == ccb->query_string.Length && RtlCompareMemory(dc2->name.Buffer, ccb->query_string.Buffer, ccb->query_string.Length) == ccb->query_string.Length) {
found = TRUE;
de.key = dc2->key;
de.name = dc2->name;
de.type = dc2->type;
de.dir_entry_type = DirEntryType_File;
de.dc = dc2;
break;
}
} else if (dc2->hash > hash)
break;
le = le->Flink;
}
}
} else {
if (fileref->fcb->hash_ptrs_uc[c]) {
le = fileref->fcb->hash_ptrs_uc[c];
while (le != &fileref->fcb->dir_children_hash_uc) {
dir_child* dc2 = CONTAINING_RECORD(le, dir_child, list_entry_hash_uc);
if (dc2->hash_uc == hash) {
if (dc2->name_uc.Length == us.Length && RtlCompareMemory(dc2->name_uc.Buffer, us.Buffer, us.Length) == us.Length) {
found = TRUE;
de.key = dc2->key;
de.name = dc2->name;
de.type = dc2->type;
de.dir_entry_type = DirEntryType_File;
de.dc = dc2;
break;
}
} else if (dc2->hash_uc > hash)
break;
le = le->Flink;
}
}
}
if (us.Buffer)
ExFreePool(us.Buffer);
if (!found) {
Status = STATUS_NO_SUCH_FILE;
goto end;
}
} else if (has_wildcard) {
while (!FsRtlIsNameInExpression(&ccb->query_string, &de.name, !ccb->case_sensitive, NULL)) {
newoffset = ccb->query_dir_offset;
Status = next_dir_entry(fileref, &newoffset, &de, &dc);
if (NT_SUCCESS(Status))
ccb->query_dir_offset = newoffset;
else {
if (Status == STATUS_NO_MORE_FILES && initial)
Status = STATUS_NO_SUCH_FILE;
goto end;
}
}
}
TRACE("file(0) = %.*S\n", de.name.Length / sizeof(WCHAR), de.name.Buffer);
TRACE("offset = %u\n", ccb->query_dir_offset - 1);
Status = query_dir_item(fcb, ccb, buf, &length, Irp, &de, fcb->subvol);
count = 0;
if (NT_SUCCESS(Status) && !(IrpSp->Flags & SL_RETURN_SINGLE_ENTRY) && !specific_file) {
lastitem = (UINT8*)buf;
while (length > 0) {
switch (IrpSp->Parameters.QueryDirectory.FileInformationClass) {
case FileBothDirectoryInformation:
case FileDirectoryInformation:
case FileIdBothDirectoryInformation:
case FileFullDirectoryInformation:
case FileIdFullDirectoryInformation:
length -= length % 8;
break;
case FileNamesInformation:
length -= length % 4;
break;
default:
WARN("unhandled file information class %u\n", IrpSp->Parameters.QueryDirectory.FileInformationClass);
break;
}
if (length > 0) {
newoffset = ccb->query_dir_offset;
Status = next_dir_entry(fileref, &newoffset, &de, &dc);
if (NT_SUCCESS(Status)) {
if (!has_wildcard || FsRtlIsNameInExpression(&ccb->query_string, &de.name, !ccb->case_sensitive, NULL)) {
curitem = (UINT8*)buf + IrpSp->Parameters.QueryDirectory.Length - length;
count++;
TRACE("file(%u) %u = %.*S\n", count, curitem - (UINT8*)buf, de.name.Length / sizeof(WCHAR), de.name.Buffer);
TRACE("offset = %u\n", ccb->query_dir_offset - 1);
status2 = query_dir_item(fcb, ccb, curitem, &length, Irp, &de, fcb->subvol);
if (NT_SUCCESS(status2)) {
ULONG* lastoffset = (ULONG*)lastitem;
*lastoffset = (ULONG)(curitem - lastitem);
ccb->query_dir_offset = newoffset;
lastitem = curitem;
} else
break;
} else
ccb->query_dir_offset = newoffset;
} else {
if (Status == STATUS_NO_MORE_FILES)
Status = STATUS_SUCCESS;
break;
}
} else
break;
}
}
Irp->IoStatus.Information = IrpSp->Parameters.QueryDirectory.Length - length;
end:
ExReleaseResourceLite(&fileref->fcb->nonpaged->dir_children_lock);
end2:
release_fcb_lock(Vcb);
ExReleaseResourceLite(&Vcb->tree_lock);
TRACE("returning %08x\n", Status);
if (utf8.Buffer)
ExFreePool(utf8.Buffer);
return Status;
}
static NTSTATUS notify_change_directory(device_extension* Vcb, PIRP Irp) {
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT FileObject = IrpSp->FileObject;
fcb* fcb = FileObject->FsContext;
ccb* ccb = FileObject->FsContext2;
file_ref* fileref = ccb ? ccb->fileref : NULL;
NTSTATUS Status;
TRACE("IRP_MN_NOTIFY_CHANGE_DIRECTORY\n");
if (!ccb) {
ERR("ccb was NULL\n");
return STATUS_INVALID_PARAMETER;
}
if (!fileref) {
ERR("no fileref\n");
return STATUS_INVALID_PARAMETER;
}
if (Irp->RequestorMode == UserMode && !(ccb->access & FILE_LIST_DIRECTORY)) {
WARN("insufficient privileges\n");
return STATUS_ACCESS_DENIED;
}
ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, TRUE);
ExAcquireResourceExclusiveLite(fcb->Header.Resource, TRUE);
if (fcb->type != BTRFS_TYPE_DIRECTORY) {
Status = STATUS_INVALID_PARAMETER;
goto end;
}
// FIXME - raise exception if FCB marked for deletion?
TRACE("%S\n", file_desc(FileObject));
if (ccb->filename.Length == 0) {
ULONG reqlen;
ccb->filename.MaximumLength = ccb->filename.Length = 0;
Status = fileref_get_filename(fileref, &ccb->filename, NULL, &reqlen);
if (Status == STATUS_BUFFER_OVERFLOW) {
ccb->filename.Buffer = ExAllocatePoolWithTag(PagedPool, reqlen, ALLOC_TAG);
if (!ccb->filename.Buffer) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
ccb->filename.MaximumLength = (UINT16)reqlen;
Status = fileref_get_filename(fileref, &ccb->filename, NULL, &reqlen);
if (!NT_SUCCESS(Status)) {
ERR("fileref_get_filename returned %08x\n", Status);
goto end;
}
} else {
ERR("fileref_get_filename returned %08x\n", Status);
goto end;
}
}
FsRtlNotifyFilterChangeDirectory(Vcb->NotifySync, &Vcb->DirNotifyList, FileObject->FsContext2, (PSTRING)&ccb->filename,
IrpSp->Flags & SL_WATCH_TREE, FALSE, IrpSp->Parameters.NotifyDirectory.CompletionFilter, Irp,
NULL, NULL, NULL);
Status = STATUS_PENDING;
end:
ExReleaseResourceLite(fcb->Header.Resource);
ExReleaseResourceLite(&fcb->Vcb->tree_lock);
return Status;
}
_Dispatch_type_(IRP_MJ_DIRECTORY_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status;
ULONG func;
BOOL top_level;
device_extension* Vcb = DeviceObject->DeviceExtension;
FsRtlEnterFileSystem();
TRACE("directory control\n");
top_level = is_top_level(Irp);
if (Vcb && Vcb->type == VCB_TYPE_VOLUME) {
Status = vol_directory_control(DeviceObject, Irp);
goto end;
} else if (!Vcb || Vcb->type != VCB_TYPE_FS) {
Status = STATUS_INVALID_PARAMETER;
goto end;
}
IrpSp = IoGetCurrentIrpStackLocation(Irp);
Irp->IoStatus.Information = 0;
func = IrpSp->MinorFunction;
switch (func) {
case IRP_MN_NOTIFY_CHANGE_DIRECTORY:
Status = notify_change_directory(Vcb, Irp);
break;
case IRP_MN_QUERY_DIRECTORY:
Status = query_directory(Irp);
break;
default:
WARN("unknown minor %u\n", func);
Status = STATUS_NOT_IMPLEMENTED;
Irp->IoStatus.Status = Status;
break;
}
if (Status == STATUS_PENDING)
goto exit;
end:
Irp->IoStatus.Status = Status;
IoCompleteRequest(Irp, IO_DISK_INCREMENT);
exit:
TRACE("returning %08x\n", Status);
if (top_level)
IoSetTopLevelIrp(NULL);
FsRtlExitFileSystem();
return Status;
}
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