fsctl.c File Reference

#include "btrfs_drv.h"
#include "btrfsioctl.h"
#include <ntddstor.h>
#include <ntdddisk.h>
#include <sys/stat.h>

Include dependency graph for fsctl.c:

Go to the source code of this file.

Macros
#define	FSCTL_CSV_CONTROL   CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 181, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define	FSCTL_QUERY_VOLUME_CONTAINER_STATE   CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 228, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define	DOTDOT   ".."
#define	SEF_AVOID_PRIVILEGE_CHECK   0x08
#define	DEVICE_DSM_FLAG_TRIM_NOT_FS_ALLOCATED   0x80000000
#define	SEF_SACL_AUTO_INHERIT   0x02

Functions
static void	mark_subvol_dirty (device_extension *Vcb, root *r)
static NTSTATUS	get_file_ids (PFILE_OBJECT FileObject, void *data, ULONG length)
static void	get_uuid (BTRFS_UUID *uuid)
static NTSTATUS	snapshot_tree_copy (device_extension *Vcb, uint64_t addr, root *subvol, uint64_t *newaddr, PIRP Irp, LIST_ENTRY *rollback)
void	flush_subvol_fcbs (root *subvol)
static NTSTATUS	do_create_snapshot (device_extension *Vcb, PFILE_OBJECT parent, fcb *subvol_fcb, PANSI_STRING utf8, PUNICODE_STRING name, bool readonly, PIRP Irp)
static NTSTATUS	create_snapshot (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG length, PIRP Irp)
static NTSTATUS	create_subvol (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, PIRP Irp)
static NTSTATUS	get_inode_info (PFILE_OBJECT FileObject, void *data, ULONG length)
static NTSTATUS	set_inode_info (PFILE_OBJECT FileObject, void *data, ULONG length, PIRP Irp)
static NTSTATUS	get_devices (device_extension *Vcb, void *data, ULONG length)
static NTSTATUS	get_usage (device_extension *Vcb, void *data, ULONG length, PIRP Irp)
static NTSTATUS	is_volume_mounted (device_extension *Vcb, PIRP Irp)
static NTSTATUS	fs_get_statistics (void *buffer, DWORD buflen, ULONG_PTR *retlen)
static NTSTATUS	set_sparse (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG length, PIRP Irp)
static NTSTATUS	zero_data (device_extension *Vcb, fcb *fcb, uint64_t start, uint64_t length, PIRP Irp, LIST_ENTRY *rollback)
static NTSTATUS	set_zero_data (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG length, PIRP Irp)
static NTSTATUS	query_ranges (PFILE_OBJECT FileObject, FILE_ALLOCATED_RANGE_BUFFER *inbuf, ULONG inbuflen, void *outbuf, ULONG outbuflen, ULONG_PTR *retlen)
static NTSTATUS	get_object_id (device_extension *Vcb, PFILE_OBJECT FileObject, FILE_OBJECTID_BUFFER *buf, ULONG buflen, ULONG_PTR *retlen)
static void	flush_fcb_caches (device_extension *Vcb)
static NTSTATUS	lock_volume (device_extension *Vcb, PIRP Irp)
void	do_unlock_volume (device_extension *Vcb)
static NTSTATUS	unlock_volume (device_extension *Vcb, PIRP Irp)
static NTSTATUS	invalidate_volumes (PIRP Irp)
static NTSTATUS	is_volume_dirty (device_extension *Vcb, PIRP Irp)
static NTSTATUS	get_compression (PIRP Irp)
static NTSTATUS	set_compression (PIRP Irp)
static void	update_volumes (device_extension *Vcb)
NTSTATUS	dismount_volume (device_extension *Vcb, bool shutdown, PIRP Irp)
static NTSTATUS	is_device_part_of_mounted_btrfs_raid (PDEVICE_OBJECT devobj, PFILE_OBJECT fileobj)
void	trim_whole_device (device *dev)
static NTSTATUS	add_device (device_extension *Vcb, PIRP Irp, KPROCESSOR_MODE processor_mode)
static NTSTATUS	allow_extended_dasd_io (device_extension *Vcb, PFILE_OBJECT FileObject)
static NTSTATUS	query_uuid (device_extension *Vcb, void *data, ULONG length)
static NTSTATUS	reset_stats (device_extension *Vcb, void *data, ULONG length, KPROCESSOR_MODE processor_mode)
static NTSTATUS	get_integrity_information (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen)
static NTSTATUS	set_integrity_information (PFILE_OBJECT FileObject, void *data, ULONG datalen)
bool	fcb_is_inline (fcb *fcb)
static NTSTATUS	duplicate_extents (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, PIRP Irp)
static NTSTATUS	mknod (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, PIRP Irp)
static NTSTATUS	recvd_subvol (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, KPROCESSOR_MODE processor_mode)
static NTSTATUS	fsctl_get_xattrs (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, KPROCESSOR_MODE processor_mode)
static NTSTATUS	fsctl_set_xattr (device_extension *Vcb, PFILE_OBJECT FileObject, void *data, ULONG datalen, PIRP Irp)
static NTSTATUS	reserve_subvol (device_extension *Vcb, PFILE_OBJECT FileObject, PIRP Irp)
static NTSTATUS	get_subvol_path (device_extension *Vcb, uint64_t id, WCHAR *out, ULONG outlen, PIRP Irp)
static NTSTATUS	find_subvol (device_extension *Vcb, void *in, ULONG inlen, void *out, ULONG outlen, PIRP Irp)
static NTSTATUS	resize_device (device_extension *Vcb, void *data, ULONG len, PIRP Irp)
static NTSTATUS	fsctl_oplock (device_extension *Vcb, PIRP *Pirp)
NTSTATUS	fsctl_request (PDEVICE_OBJECT DeviceObject, PIRP *Pirp, uint32_t type)

Variables
LIST_ENTRY	VcbList
ERESOURCE	global_loading_lock
PDRIVER_OBJECT	drvobj
tFsRtlCheckLockForOplockRequest	fFsRtlCheckLockForOplockRequest
tFsRtlAreThereCurrentOrInProgressFileLocks	fFsRtlAreThereCurrentOrInProgressFileLocks

Macro Definition Documentation

DEVICE_DSM_FLAG_TRIM_NOT_FS_ALLOCATED

#define DEVICE_DSM_FLAG_TRIM_NOT_FS_ALLOCATED   0x80000000

Definition at line 39 of file fsctl.c.

DOTDOT

#define DOTDOT   ".."

Definition at line 34 of file fsctl.c.

FSCTL_CSV_CONTROL

#define FSCTL_CSV_CONTROL   CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 181, METHOD_BUFFERED, FILE_ANY_ACCESS)

Definition at line 27 of file fsctl.c.

FSCTL_QUERY_VOLUME_CONTAINER_STATE

#define FSCTL_QUERY_VOLUME_CONTAINER_STATE   CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 228, METHOD_BUFFERED, FILE_ANY_ACCESS)

Definition at line 31 of file fsctl.c.

SEF_AVOID_PRIVILEGE_CHECK

#define SEF_AVOID_PRIVILEGE_CHECK   0x08

Definition at line 36 of file fsctl.c.

SEF_SACL_AUTO_INHERIT

#define SEF_SACL_AUTO_INHERIT   0x02

Definition at line 42 of file fsctl.c.

Function Documentation

add_device()

static NTSTATUS add_device ( device_extension *  Vcb, PIRP  Irp, KPROCESSOR_MODE  processor_mode  )

static

Definition at line 2729 of file fsctl.c.

                                                                                            {
    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS Status;
    PFILE_OBJECT fileobj, mountmgrfo;
    PDEVICE_OBJECT DeviceObject;
    HANDLE h;
    LIST_ENTRY* le;
    device* dev;
    DEV_ITEM* di;
    uint64_t dev_id, size;
    uint8_t* mb;
    uint64_t* stats;
    UNICODE_STRING mmdevpath, pnp_name, pnp_name2;
    volume_child* vc;
    PDEVICE_OBJECT mountmgr;
    KEY searchkey;
    traverse_ptr tp;
    STORAGE_DEVICE_NUMBER sdn;
    volume_device_extension* vde;
    pdo_device_extension* pdode;
    const GUID* pnp_guid;
    GET_LENGTH_INFORMATION gli;

    pnp_name.Buffer = NULL;

    if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
        return STATUS_PRIVILEGE_NOT_HELD;

    if (!Vcb->vde) {
        WARN("not allowing second device to be added to non-PNP device\n");
        return STATUS_NOT_SUPPORTED;
    }

    if (Vcb->readonly) // FIXME - handle adding R/W device to seeding device
        return STATUS_MEDIA_WRITE_PROTECTED;

#if defined(_WIN64)
    if (IoIs32bitProcess(Irp)) {
        if (IrpSp->Parameters.FileSystemControl.InputBufferLength != sizeof(uint32_t))
            return STATUS_INVALID_PARAMETER;

        h = (HANDLE)LongToHandle((*(uint32_t*)Irp->AssociatedIrp.SystemBuffer));
    } else {
#endif
        if (IrpSp->Parameters.FileSystemControl.InputBufferLength != sizeof(HANDLE))
            return STATUS_INVALID_PARAMETER;

        h = *(PHANDLE)Irp->AssociatedIrp.SystemBuffer;
#if defined(_WIN64)
    }
#endif

    Status = ObReferenceObjectByHandle(h, 0, *IoFileObjectType, Irp->RequestorMode, (void**)&fileobj, NULL);

    if (!NT_SUCCESS(Status)) {
        ERR("ObReferenceObjectByHandle returned %08lx\n", Status);
        return Status;
    }

    DeviceObject = fileobj->DeviceObject;

    Status = get_device_pnp_name(DeviceObject, &pnp_name, &pnp_guid);
    if (!NT_SUCCESS(Status)) {
        ERR("get_device_pnp_name returned %08lx\n", Status);
        ObDereferenceObject(fileobj);
        return Status;
    }

    // If this is a disk, we have been handed the PDO, so need to go up to find something we can use
    if (RtlCompareMemory(pnp_guid, &GUID_DEVINTERFACE_DISK, sizeof(GUID)) == sizeof(GUID) && DeviceObject->AttachedDevice)
        DeviceObject = DeviceObject->AttachedDevice;

    Status = dev_ioctl(DeviceObject, IOCTL_DISK_IS_WRITABLE, NULL, 0, NULL, 0, true, NULL);
    if (!NT_SUCCESS(Status)) {
        ERR("IOCTL_DISK_IS_WRITABLE returned %08lx\n", Status);
        ObDereferenceObject(fileobj);
        return Status;
    }

    Status = is_device_part_of_mounted_btrfs_raid(DeviceObject, fileobj);
    if (!NT_SUCCESS(Status)) {
        ERR("is_device_part_of_mounted_btrfs_raid returned %08lx\n", Status);
        ObDereferenceObject(fileobj);
        return Status;
    }

    // if disk, check it has no partitions
    if (RtlCompareMemory(pnp_guid, &GUID_DEVINTERFACE_DISK, sizeof(GUID)) == sizeof(GUID)) {
        ULONG dlisize;
        DRIVE_LAYOUT_INFORMATION_EX* dli = NULL;

        dlisize = 0;

        do {
            dlisize += 1024;

            if (dli)
                ExFreePool(dli);

            dli = ExAllocatePoolWithTag(PagedPool, dlisize, ALLOC_TAG);
            if (!dli) {
                ERR("out of memory\n");
                Status = STATUS_INSUFFICIENT_RESOURCES;
                goto end2;
            }

            Status = dev_ioctl(DeviceObject, IOCTL_DISK_GET_DRIVE_LAYOUT_EX, NULL, 0, dli, dlisize, true, NULL);
        } while (Status == STATUS_BUFFER_TOO_SMALL);

        if (NT_SUCCESS(Status) && dli->PartitionCount > 0) {
            ExFreePool(dli);
            ERR("not adding disk which has partitions\n");
            Status = STATUS_DEVICE_NOT_READY;
            goto end2;
        }

        ExFreePool(dli);
    }

    Status = dev_ioctl(DeviceObject, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL, 0,
                       &sdn, sizeof(STORAGE_DEVICE_NUMBER), true, NULL);
    if (NT_SUCCESS(Status)) {
        if (sdn.DeviceType != FILE_DEVICE_DISK) { // FIXME - accept floppies and CDs?
            WARN("device was not disk\n");
            ObDereferenceObject(fileobj);
            return STATUS_INVALID_PARAMETER;
        }
    } else {
        sdn.DeviceNumber = 0xffffffff;
        sdn.PartitionNumber = 0xffffffff;
    }

    Status = dev_ioctl(DeviceObject, IOCTL_DISK_GET_LENGTH_INFO, NULL, 0,
                        &gli, sizeof(gli), true, NULL);
    if (!NT_SUCCESS(Status)) {
        ERR("error reading length information: %08lx\n", Status);
        ObDereferenceObject(fileobj);
        return Status;
    }

    size = gli.Length.QuadPart;

    if (size < 0x100000) {
        ERR("device was not large enough to hold FS (%I64x bytes, need at least 1 MB)\n", size);
        ObDereferenceObject(fileobj);
        return STATUS_INTERNAL_ERROR;
    }

    volume_removal(drvobj, &pnp_name);

    ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);

    if (Vcb->need_write)
        Status = do_write(Vcb, Irp);
    else
        Status = STATUS_SUCCESS;

    free_trees(Vcb);

    if (!NT_SUCCESS(Status)) {
        ERR("do_write returned %08lx\n", Status);
        goto end;
    }

    dev = ExAllocatePoolWithTag(NonPagedPool, sizeof(device), ALLOC_TAG);
    if (!dev) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    RtlZeroMemory(dev, sizeof(device));

    dev->devobj = DeviceObject;
    dev->fileobj = fileobj;
    dev->seeding = false;
    init_device(Vcb, dev, true);

    InitializeListHead(&dev->space);

    if (size > 0x100000) { // add disk hole - the first MB is marked as used
        Status = add_space_entry(&dev->space, NULL, 0x100000, size - 0x100000);
        if (!NT_SUCCESS(Status)) {
            ERR("add_space_entry returned %08lx\n", Status);
            goto end;
        }
    }

    dev_id = 0;

    le = Vcb->devices.Flink;
    while (le != &Vcb->devices) {
        device* dev2 = CONTAINING_RECORD(le, device, list_entry);

        if (dev2->devitem.dev_id > dev_id)
            dev_id = dev2->devitem.dev_id;

        le = le->Flink;
    }

    dev_id++;

    dev->devitem.dev_id = dev_id;
    dev->devitem.num_bytes = size;
    dev->devitem.bytes_used = 0;
    dev->devitem.optimal_io_align = Vcb->superblock.sector_size;
    dev->devitem.optimal_io_width = Vcb->superblock.sector_size;
    dev->devitem.minimal_io_size = Vcb->superblock.sector_size;
    dev->devitem.type = 0;
    dev->devitem.generation = 0;
    dev->devitem.start_offset = 0;
    dev->devitem.dev_group = 0;
    dev->devitem.seek_speed = 0;
    dev->devitem.bandwidth = 0;
    get_uuid(&dev->devitem.device_uuid);
    dev->devitem.fs_uuid = Vcb->superblock.uuid;

    di = ExAllocatePoolWithTag(PagedPool, sizeof(DEV_ITEM), ALLOC_TAG);
    if (!di) {
        ERR("out of memory\n");
        goto end;
    }

    RtlCopyMemory(di, &dev->devitem, sizeof(DEV_ITEM));

    Status = insert_tree_item(Vcb, Vcb->chunk_root, 1, TYPE_DEV_ITEM, di->dev_id, di, sizeof(DEV_ITEM), NULL, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("insert_tree_item returned %08lx\n", Status);
        ExFreePool(di);
        goto end;
    }

    // add stats entry to dev tree
    stats = ExAllocatePoolWithTag(PagedPool, sizeof(uint64_t) * 5, ALLOC_TAG);
    if (!stats) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    RtlZeroMemory(stats, sizeof(uint64_t) * 5);

    searchkey.obj_id = 0;
    searchkey.obj_type = TYPE_DEV_STATS;
    searchkey.offset = di->dev_id;

    Status = find_item(Vcb, Vcb->dev_root, &tp, &searchkey, false, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("error - find_item returned %08lx\n", Status);
        ExFreePool(stats);
        goto end;
    }

    if (!keycmp(tp.item->key, searchkey)) {
        Status = delete_tree_item(Vcb, &tp);
        if (!NT_SUCCESS(Status)) {
            ERR("delete_tree_item returned %08lx\n", Status);
            ExFreePool(stats);
            goto end;
        }
    }

    Status = insert_tree_item(Vcb, Vcb->dev_root, 0, TYPE_DEV_STATS, di->dev_id, stats, sizeof(uint64_t) * 5, NULL, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("insert_tree_item returned %08lx\n", Status);
        ExFreePool(stats);
        goto end;
    }

    if (dev->trim && !dev->readonly && !Vcb->options.no_trim)
        trim_whole_device(dev);

    // We clear the first megabyte of the device, so Windows doesn't identify it as another FS
    mb = ExAllocatePoolWithTag(PagedPool, 0x100000, ALLOC_TAG);
    if (!mb) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    RtlZeroMemory(mb, 0x100000);

    Status = write_data_phys(DeviceObject, fileobj, 0, mb, 0x100000);
    if (!NT_SUCCESS(Status)) {
        ERR("write_data_phys returned %08lx\n", Status);
        ExFreePool(mb);
        goto end;
    }

    ExFreePool(mb);

    vde = Vcb->vde;
    pdode = vde->pdode;

    vc = ExAllocatePoolWithTag(NonPagedPool, sizeof(volume_child), ALLOC_TAG);
    if (!vc) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    vc->uuid = dev->devitem.device_uuid;
    vc->devid = dev_id;
    vc->generation = Vcb->superblock.generation;
    vc->devobj = DeviceObject;
    vc->fileobj = fileobj;
    vc->notification_entry = NULL;
    vc->boot_volume = false;

    Status = IoRegisterPlugPlayNotification(EventCategoryTargetDeviceChange, 0, fileobj,
                                            drvobj, pnp_removal, vde->pdode, &vc->notification_entry);
    if (!NT_SUCCESS(Status))
        WARN("IoRegisterPlugPlayNotification returned %08lx\n", Status);

    pnp_name2 = pnp_name;

    if (pnp_name.Length > 4 * sizeof(WCHAR) && pnp_name.Buffer[0] == '\\' && (pnp_name.Buffer[1] == '\\' || pnp_name.Buffer[1] == '?') &&
        pnp_name.Buffer[2] == '?' && pnp_name.Buffer[3] == '\\') {
        pnp_name2.Buffer = &pnp_name2.Buffer[3];
        pnp_name2.Length -= 3 * sizeof(WCHAR);
        pnp_name2.MaximumLength -= 3 * sizeof(WCHAR);
    }

    vc->pnp_name.Length = vc->pnp_name.MaximumLength = pnp_name2.Length;

    if (pnp_name2.Length == 0)
        vc->pnp_name.Buffer = NULL;
    else {
        vc->pnp_name.Buffer = ExAllocatePoolWithTag(PagedPool, pnp_name2.Length, ALLOC_TAG);
        if (!vc->pnp_name.Buffer) {
            ERR("out of memory\n");
            Status = STATUS_INSUFFICIENT_RESOURCES;
            goto end;
        }

        RtlCopyMemory(vc->pnp_name.Buffer, pnp_name2.Buffer, pnp_name2.Length);
    }

    vc->size = size;
    vc->seeding = false;
    vc->disk_num = sdn.DeviceNumber;
    vc->part_num = sdn.PartitionNumber;
    vc->had_drive_letter = false;

    ExAcquireResourceExclusiveLite(&pdode->child_lock, true);
    InsertTailList(&pdode->children, &vc->list_entry);
    pdode->num_children++;
    pdode->children_loaded++;
    ExReleaseResourceLite(&pdode->child_lock);

    RtlInitUnicodeString(&mmdevpath, MOUNTMGR_DEVICE_NAME);
    Status = IoGetDeviceObjectPointer(&mmdevpath, FILE_READ_ATTRIBUTES, &mountmgrfo, &mountmgr);
    if (!NT_SUCCESS(Status))
        ERR("IoGetDeviceObjectPointer returned %08lx\n", Status);
    else {
        Status = remove_drive_letter(mountmgr, &pnp_name);
        if (!NT_SUCCESS(Status) && Status != STATUS_NOT_FOUND)
            WARN("remove_drive_letter returned %08lx\n", Status);

        vc->had_drive_letter = NT_SUCCESS(Status);

        ObDereferenceObject(mountmgrfo);
    }

    Vcb->superblock.num_devices++;
    Vcb->superblock.total_bytes += size;
    Vcb->devices_loaded++;
    InsertTailList(&Vcb->devices, &dev->list_entry);

    // FIXME - send notification that volume size has increased

    ObReferenceObject(DeviceObject); // for Vcb

    Status = do_write(Vcb, Irp);
    if (!NT_SUCCESS(Status))
        ERR("do_write returned %08lx\n", Status);

    ObReferenceObject(fileobj);

end:
    free_trees(Vcb);

    ExReleaseResourceLite(&Vcb->tree_lock);

end2:
    ObDereferenceObject(fileobj);

    if (pnp_name.Buffer)
        ExFreePool(pnp_name.Buffer);

    if (NT_SUCCESS(Status))
        FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_CHANGE_SIZE);

    return Status;
}

Referenced by fsctl_request().

allow_extended_dasd_io()

static NTSTATUS allow_extended_dasd_io ( device_extension *  Vcb, PFILE_OBJECT  FileObject  )

static

Definition at line 3125 of file fsctl.c.

                                                                                       {
    fcb* fcb;
    ccb* ccb;

    TRACE("FSCTL_ALLOW_EXTENDED_DASD_IO\n");

    if (!FileObject)
        return STATUS_INVALID_PARAMETER;

    fcb = FileObject->FsContext;
    ccb = FileObject->FsContext2;

    if (!fcb)
        return STATUS_INVALID_PARAMETER;

    if (fcb != Vcb->volume_fcb)
        return STATUS_INVALID_PARAMETER;

    if (!ccb)
        return STATUS_INVALID_PARAMETER;

    ccb->allow_extended_dasd_io = true;

    return STATUS_SUCCESS;
}

Referenced by fsctl_request().

create_snapshot()

static NTSTATUS create_snapshot ( device_extension *  Vcb, PFILE_OBJECT  FileObject, void *  data, ULONG  length, PIRP  Irp  )

static

Definition at line 523 of file fsctl.c.

                                                                                                                    {
    PFILE_OBJECT subvol_obj;
    NTSTATUS Status;
    btrfs_create_snapshot* bcs = data;
    fcb* subvol_fcb;
    HANDLE subvolh;
    bool readonly, posix;
    ANSI_STRING utf8;
    UNICODE_STRING nameus;
    ULONG len;
    fcb* fcb;
    ccb* ccb;
    file_ref *fileref, *fr2;

#if defined(_WIN64)
    if (IoIs32bitProcess(Irp)) {
        btrfs_create_snapshot32* bcs32 = data;

        if (length < offsetof(btrfs_create_snapshot32, name))
            return STATUS_INVALID_PARAMETER;

        if (length < offsetof(btrfs_create_snapshot32, name) + bcs32->namelen)
            return STATUS_INVALID_PARAMETER;

        subvolh = Handle32ToHandle(bcs32->subvol);

        nameus.Buffer = bcs32->name;
        nameus.Length = nameus.MaximumLength = bcs32->namelen;

        readonly = bcs32->readonly;
        posix = bcs32->posix;
    } else {
#endif
        if (length < offsetof(btrfs_create_snapshot, name))
            return STATUS_INVALID_PARAMETER;

        if (length < offsetof(btrfs_create_snapshot, name) + bcs->namelen)
            return STATUS_INVALID_PARAMETER;

        subvolh = bcs->subvol;

        nameus.Buffer = bcs->name;
        nameus.Length = nameus.MaximumLength = bcs->namelen;

        readonly = bcs->readonly;
        posix = bcs->posix;
#if defined(_WIN64)
    }
#endif

    if (!subvolh)
        return STATUS_INVALID_PARAMETER;

    if (!FileObject || !FileObject->FsContext)
        return STATUS_INVALID_PARAMETER;

    fcb = FileObject->FsContext;
    ccb = FileObject->FsContext2;

    if (!fcb || !ccb || fcb->type != BTRFS_TYPE_DIRECTORY)
        return STATUS_INVALID_PARAMETER;

    fileref = ccb->fileref;

    if (!fileref) {
        ERR("fileref was NULL\n");
        return STATUS_INVALID_PARAMETER;
    }

    if (!(ccb->access & FILE_ADD_SUBDIRECTORY)) {
        WARN("insufficient privileges\n");
        return STATUS_ACCESS_DENIED;
    }

    if (Vcb->readonly)
        return STATUS_MEDIA_WRITE_PROTECTED;

    if (is_subvol_readonly(fcb->subvol, Irp))
        return STATUS_ACCESS_DENIED;

    if (!is_file_name_valid(&nameus, posix, false))
        return STATUS_OBJECT_NAME_INVALID;

    utf8.Buffer = NULL;

    Status = utf16_to_utf8(NULL, 0, &len, nameus.Buffer, nameus.Length);
    if (!NT_SUCCESS(Status)) {
        ERR("utf16_to_utf8 failed with error %08lx\n", Status);
        return Status;
    }

    if (len == 0) {
        ERR("utf16_to_utf8 returned a length of 0\n");
        return STATUS_INTERNAL_ERROR;
    }

    if (len > 0xffff) {
        ERR("len was too long\n");
        return STATUS_INVALID_PARAMETER;
    }

    utf8.MaximumLength = utf8.Length = (USHORT)len;
    utf8.Buffer = ExAllocatePoolWithTag(PagedPool, utf8.Length, ALLOC_TAG);

    if (!utf8.Buffer) {
        ERR("out of memory\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    Status = utf16_to_utf8(utf8.Buffer, len, &len, nameus.Buffer, nameus.Length);
    if (!NT_SUCCESS(Status)) {
        ERR("utf16_to_utf8 failed with error %08lx\n", Status);
        goto end2;
    }

    ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);

    // no need for fcb_lock as we have tree_lock exclusively
    Status = open_fileref(fcb->Vcb, &fr2, &nameus, fileref, false, NULL, NULL, PagedPool, ccb->case_sensitive || posix, Irp);

    if (NT_SUCCESS(Status)) {
        if (!fr2->deleted) {
            WARN("file already exists\n");
            free_fileref(fr2);
            Status = STATUS_OBJECT_NAME_COLLISION;
            goto end3;
        } else
            free_fileref(fr2);
    } else if (!NT_SUCCESS(Status) && Status != STATUS_OBJECT_NAME_NOT_FOUND) {
        ERR("open_fileref returned %08lx\n", Status);
        goto end3;
    }

    Status = ObReferenceObjectByHandle(subvolh, 0, *IoFileObjectType, Irp->RequestorMode, (void**)&subvol_obj, NULL);
    if (!NT_SUCCESS(Status)) {
        ERR("ObReferenceObjectByHandle returned %08lx\n", Status);
        goto end3;
    }

    if (subvol_obj->DeviceObject != FileObject->DeviceObject) {
        Status = STATUS_INVALID_PARAMETER;
        goto end;
    }

    subvol_fcb = subvol_obj->FsContext;
    if (!subvol_fcb) {
        Status = STATUS_INVALID_PARAMETER;
        goto end;
    }

    if (subvol_fcb->inode != subvol_fcb->subvol->root_item.objid) {
        WARN("handle inode was %I64x, expected %I64x\n", subvol_fcb->inode, subvol_fcb->subvol->root_item.objid);
        Status = STATUS_INVALID_PARAMETER;
        goto end;
    }

    ccb = subvol_obj->FsContext2;

    if (!ccb) {
        Status = STATUS_INVALID_PARAMETER;
        goto end;
    }

    if (!(ccb->access & FILE_TRAVERSE)) {
        WARN("insufficient privileges\n");
        Status = STATUS_ACCESS_DENIED;
        goto end;
    }

    if (fcb == Vcb->dummy_fcb) {
        Status = STATUS_ACCESS_DENIED;
        goto end;
    }

    // clear unique flag on extents of open files in subvol
    if (!IsListEmpty(&subvol_fcb->subvol->fcbs)) {
        LIST_ENTRY* le = subvol_fcb->subvol->fcbs.Flink;

        while (le != &subvol_fcb->subvol->fcbs) {
            struct _fcb* openfcb = CONTAINING_RECORD(le, struct _fcb, list_entry);
            LIST_ENTRY* le2;

            le2 = openfcb->extents.Flink;

            while (le2 != &openfcb->extents) {
                extent* ext = CONTAINING_RECORD(le2, extent, list_entry);

                ext->unique = false;

                le2 = le2->Flink;
            }

            le = le->Flink;
        }
    }

    Status = do_create_snapshot(Vcb, FileObject, subvol_fcb, &utf8, &nameus, readonly, Irp);

    if (NT_SUCCESS(Status)) {
        file_ref* fr;

        Status = open_fileref(Vcb, &fr, &nameus, fileref, false, NULL, NULL, PagedPool, false, Irp);

        if (!NT_SUCCESS(Status)) {
            ERR("open_fileref returned %08lx\n", Status);
            Status = STATUS_SUCCESS;
        } else {
            send_notification_fileref(fr, FILE_NOTIFY_CHANGE_DIR_NAME, FILE_ACTION_ADDED, NULL);
            free_fileref(fr);
        }
    }

end:
    ObDereferenceObject(subvol_obj);

end3:
    ExReleaseResourceLite(&Vcb->tree_lock);

end2:
    ExFreePool(utf8.Buffer);

    return Status;
}

Referenced by fsctl_request().

create_subvol()

static NTSTATUS create_subvol ( device_extension *  Vcb, PFILE_OBJECT  FileObject, void *  data, ULONG  datalen, PIRP  Irp  )

static

Definition at line 747 of file fsctl.c.

                                                                                                                   {
    btrfs_create_subvol* bcs;
    fcb *fcb, *rootfcb = NULL;
    ccb* ccb;
    file_ref* fileref;
    NTSTATUS Status;
    uint64_t id;
    root* r = NULL;
    LARGE_INTEGER time;
    BTRFS_TIME now;
    ULONG len;
    uint16_t irsize;
    UNICODE_STRING nameus;
    ANSI_STRING utf8;
    INODE_REF* ir;
    KEY searchkey;
    traverse_ptr tp;
    SECURITY_SUBJECT_CONTEXT subjcont;
    PSID owner;
    BOOLEAN defaulted;
    uint64_t* root_num;
    file_ref *fr = NULL, *fr2;
    dir_child* dc = NULL;

    fcb = FileObject->FsContext;
    if (!fcb) {
        ERR("error - fcb was NULL\n");
        return STATUS_INTERNAL_ERROR;
    }

    ccb = FileObject->FsContext2;
    if (!ccb) {
        ERR("error - ccb was NULL\n");
        return STATUS_INTERNAL_ERROR;
    }

    fileref = ccb->fileref;

    if (fcb->type != BTRFS_TYPE_DIRECTORY) {
        ERR("parent FCB was not a directory\n");
        return STATUS_NOT_A_DIRECTORY;
    }

    if (!fileref) {
        ERR("fileref was NULL\n");
        return STATUS_INVALID_PARAMETER;
    }

    if (fileref->deleted || fcb->deleted) {
        ERR("parent has been deleted\n");
        return STATUS_FILE_DELETED;
    }

    if (!(ccb->access & FILE_ADD_SUBDIRECTORY)) {
        WARN("insufficient privileges\n");
        return STATUS_ACCESS_DENIED;
    }

    if (Vcb->readonly)
        return STATUS_MEDIA_WRITE_PROTECTED;

    if (is_subvol_readonly(fcb->subvol, Irp))
        return STATUS_ACCESS_DENIED;

    if (fcb == Vcb->dummy_fcb)
        return STATUS_ACCESS_DENIED;

    if (!data || datalen < sizeof(btrfs_create_subvol))
        return STATUS_INVALID_PARAMETER;

    bcs = (btrfs_create_subvol*)data;

    if (offsetof(btrfs_create_subvol, name[0]) + bcs->namelen > datalen)
        return STATUS_INVALID_PARAMETER;

    nameus.Length = nameus.MaximumLength = bcs->namelen;
    nameus.Buffer = bcs->name;

    if (!is_file_name_valid(&nameus, bcs->posix, false))
        return STATUS_OBJECT_NAME_INVALID;

    utf8.Buffer = NULL;

    Status = utf16_to_utf8(NULL, 0, &len, nameus.Buffer, nameus.Length);
    if (!NT_SUCCESS(Status)) {
        ERR("utf16_to_utf8 failed with error %08lx\n", Status);
        return Status;
    }

    if (len == 0) {
        ERR("utf16_to_utf8 returned a length of 0\n");
        return STATUS_INTERNAL_ERROR;
    }

    if (len > 0xffff) {
        ERR("len was too long\n");
        return STATUS_INVALID_PARAMETER;
    }

    utf8.MaximumLength = utf8.Length = (USHORT)len;
    utf8.Buffer = ExAllocatePoolWithTag(PagedPool, utf8.Length, ALLOC_TAG);

    if (!utf8.Buffer) {
        ERR("out of memory\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    Status = utf16_to_utf8(utf8.Buffer, len, &len, nameus.Buffer, nameus.Length);
    if (!NT_SUCCESS(Status)) {
        ERR("utf16_to_utf8 failed with error %08lx\n", Status);
        goto end2;
    }

    ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);

    KeQuerySystemTime(&time);
    win_time_to_unix(time, &now);

    // no need for fcb_lock as we have tree_lock exclusively
    Status = open_fileref(fcb->Vcb, &fr2, &nameus, fileref, false, NULL, NULL, PagedPool, ccb->case_sensitive || bcs->posix, Irp);

    if (NT_SUCCESS(Status)) {
        if (!fr2->deleted) {
            WARN("file already exists\n");
            free_fileref(fr2);
            Status = STATUS_OBJECT_NAME_COLLISION;
            goto end;
        } else
            free_fileref(fr2);
    } else if (!NT_SUCCESS(Status) && Status != STATUS_OBJECT_NAME_NOT_FOUND) {
        ERR("open_fileref returned %08lx\n", Status);
        goto end;
    }

    id = InterlockedIncrement64(&Vcb->root_root->lastinode);
    Status = create_root(Vcb, id, &r, false, 0, Irp);

    if (!NT_SUCCESS(Status)) {
        ERR("create_root returned %08lx\n", Status);
        goto end;
    }

    TRACE("created root %I64x\n", id);

    if (!Vcb->uuid_root) {
        root* uuid_root;

        TRACE("uuid root doesn't exist, creating it\n");

        Status = create_root(Vcb, BTRFS_ROOT_UUID, &uuid_root, false, 0, Irp);

        if (!NT_SUCCESS(Status)) {
            ERR("create_root returned %08lx\n", Status);
            goto end;
        }

        Vcb->uuid_root = uuid_root;
    }

    root_num = ExAllocatePoolWithTag(PagedPool, sizeof(uint64_t), ALLOC_TAG);
    if (!root_num) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    tp.tree = NULL;

    do {
        get_uuid(&r->root_item.uuid);

        RtlCopyMemory(&searchkey.obj_id, &r->root_item.uuid, sizeof(uint64_t));
        searchkey.obj_type = TYPE_SUBVOL_UUID;
        RtlCopyMemory(&searchkey.offset, &r->root_item.uuid.uuid[sizeof(uint64_t)], sizeof(uint64_t));

        Status = find_item(Vcb, Vcb->uuid_root, &tp, &searchkey, false, Irp);
    } while (NT_SUCCESS(Status) && !keycmp(searchkey, tp.item->key));

    *root_num = r->id;

    Status = insert_tree_item(Vcb, Vcb->uuid_root, searchkey.obj_id, searchkey.obj_type, searchkey.offset, root_num, sizeof(uint64_t), NULL, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("insert_tree_item returned %08lx\n", Status);
        ExFreePool(root_num);
        goto end;
    }

    r->root_item.inode.generation = 1;
    r->root_item.inode.st_size = 3;
    r->root_item.inode.st_blocks = Vcb->superblock.node_size;
    r->root_item.inode.st_nlink = 1;
    r->root_item.inode.st_mode = __S_IFDIR | S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; // 40755
    r->root_item.inode.flags = 0xffffffff80000000; // FIXME - find out what these mean

    if (bcs->readonly)
        r->root_item.flags |= BTRFS_SUBVOL_READONLY;

    r->root_item.objid = SUBVOL_ROOT_INODE;
    r->root_item.bytes_used = Vcb->superblock.node_size;
    r->root_item.ctransid = Vcb->superblock.generation;
    r->root_item.otransid = Vcb->superblock.generation;
    r->root_item.ctime = now;
    r->root_item.otime = now;

    // add .. inode to new subvol

    rootfcb = create_fcb(Vcb, PagedPool);
    if (!rootfcb) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    rootfcb->Vcb = Vcb;

    rootfcb->subvol = r;
    rootfcb->inode = SUBVOL_ROOT_INODE;
    rootfcb->type = BTRFS_TYPE_DIRECTORY;

    rootfcb->inode_item.generation = Vcb->superblock.generation;
    rootfcb->inode_item.transid = Vcb->superblock.generation;
    rootfcb->inode_item.st_nlink = 1;
    rootfcb->inode_item.st_mode = __S_IFDIR | inherit_mode(fileref->fcb, true);
    rootfcb->inode_item.st_atime = rootfcb->inode_item.st_ctime = rootfcb->inode_item.st_mtime = rootfcb->inode_item.otime = now;
    rootfcb->inode_item.st_gid = GID_NOBODY;

    rootfcb->atts = get_file_attributes(Vcb, rootfcb->subvol, rootfcb->inode, rootfcb->type, false, true, Irp);

    if (r->root_item.flags & BTRFS_SUBVOL_READONLY)
        rootfcb->atts |= FILE_ATTRIBUTE_READONLY;

    SeCaptureSubjectContext(&subjcont);

    Status = SeAssignSecurity(fcb->sd, NULL, (void**)&rootfcb->sd, true, &subjcont, IoGetFileObjectGenericMapping(), PagedPool);

    if (!NT_SUCCESS(Status)) {
        ERR("SeAssignSecurity returned %08lx\n", Status);
        goto end;
    }

    if (!rootfcb->sd) {
        ERR("SeAssignSecurity returned NULL security descriptor\n");
        Status = STATUS_INTERNAL_ERROR;
        goto end;
    }

    Status = RtlGetOwnerSecurityDescriptor(rootfcb->sd, &owner, &defaulted);
    if (!NT_SUCCESS(Status)) {
        ERR("RtlGetOwnerSecurityDescriptor returned %08lx\n", Status);
        rootfcb->inode_item.st_uid = UID_NOBODY;
        rootfcb->sd_dirty = true;
    } else {
        rootfcb->inode_item.st_uid = sid_to_uid(owner);
        rootfcb->sd_dirty = rootfcb->inode_item.st_uid == UID_NOBODY;
    }

    find_gid(rootfcb, fileref->fcb, &subjcont);

    rootfcb->inode_item_changed = true;

    acquire_fcb_lock_exclusive(Vcb);
    InsertTailList(&r->fcbs, &rootfcb->list_entry);
    InsertTailList(&Vcb->all_fcbs, &rootfcb->list_entry_all);
    r->fcbs_version++;
    release_fcb_lock(Vcb);

    rootfcb->Header.IsFastIoPossible = fast_io_possible(rootfcb);
    rootfcb->Header.AllocationSize.QuadPart = 0;
    rootfcb->Header.FileSize.QuadPart = 0;
    rootfcb->Header.ValidDataLength.QuadPart = 0;

    rootfcb->created = true;

    if (fileref->fcb->inode_item.flags & BTRFS_INODE_COMPRESS)
        rootfcb->inode_item.flags |= BTRFS_INODE_COMPRESS;

    rootfcb->prop_compression = fileref->fcb->prop_compression;
    rootfcb->prop_compression_changed = rootfcb->prop_compression != PropCompression_None;

    r->lastinode = rootfcb->inode;

    // add INODE_REF

    irsize = (uint16_t)(offsetof(INODE_REF, name[0]) + sizeof(DOTDOT) - 1);
    ir = ExAllocatePoolWithTag(PagedPool, irsize, ALLOC_TAG);
    if (!ir) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    ir->index = 0;
    ir->n = sizeof(DOTDOT) - 1;
    RtlCopyMemory(ir->name, DOTDOT, ir->n);

    Status = insert_tree_item(Vcb, r, r->root_item.objid, TYPE_INODE_REF, r->root_item.objid, ir, irsize, NULL, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("insert_tree_item returned %08lx\n", Status);
        ExFreePool(ir);
        goto end;
    }

    // create fileref for entry in other subvolume

    fr = create_fileref(Vcb);
    if (!fr) {
        ERR("out of memory\n");

        reap_fcb(rootfcb);

        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    fr->fcb = rootfcb;

    mark_fcb_dirty(rootfcb);

    fr->parent = fileref;

    Status = add_dir_child(fileref->fcb, r->id, true, &utf8, &nameus, BTRFS_TYPE_DIRECTORY, &dc);
    if (!NT_SUCCESS(Status))
        WARN("add_dir_child returned %08lx\n", Status);

    fr->dc = dc;
    dc->fileref = fr;

    fr->fcb->hash_ptrs = ExAllocatePoolWithTag(PagedPool, sizeof(LIST_ENTRY*) * 256, ALLOC_TAG);
    if (!fr->fcb->hash_ptrs) {
        ERR("out of memory\n");
        free_fileref(fr);
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    RtlZeroMemory(fr->fcb->hash_ptrs, sizeof(LIST_ENTRY*) * 256);

    fr->fcb->hash_ptrs_uc = ExAllocatePoolWithTag(PagedPool, sizeof(LIST_ENTRY*) * 256, ALLOC_TAG);
    if (!fr->fcb->hash_ptrs_uc) {
        ERR("out of memory\n");
        free_fileref(fr);
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    RtlZeroMemory(fr->fcb->hash_ptrs_uc, sizeof(LIST_ENTRY*) * 256);

    ExAcquireResourceExclusiveLite(&fileref->fcb->nonpaged->dir_children_lock, true);
    InsertTailList(&fileref->children, &fr->list_entry);
    ExReleaseResourceLite(&fileref->fcb->nonpaged->dir_children_lock);

    increase_fileref_refcount(fileref);

    if (fr->fcb->type == BTRFS_TYPE_DIRECTORY)
        fr->fcb->fileref = fr;

    fr->created = true;
    mark_fileref_dirty(fr);

    // change fcb->subvol's ROOT_ITEM

    fcb->subvol->root_item.ctransid = Vcb->superblock.generation;
    fcb->subvol->root_item.ctime = now;

    // change fcb's INODE_ITEM

    fcb->inode_item.transid = Vcb->superblock.generation;
    fcb->inode_item.st_size += utf8.Length * 2;
    fcb->inode_item.sequence++;

    if (!ccb->user_set_change_time)
        fcb->inode_item.st_ctime = now;

    if (!ccb->user_set_write_time)
        fcb->inode_item.st_mtime = now;

    fcb->inode_item_changed = true;
    mark_fcb_dirty(fcb);

    fr->fcb->subvol->parent = fcb->subvol->id;

    Status = STATUS_SUCCESS;

end:
    if (!NT_SUCCESS(Status)) {
        if (fr) {
            fr->deleted = true;
            mark_fileref_dirty(fr);
        } else if (rootfcb) {
            rootfcb->deleted = true;
            mark_fcb_dirty(rootfcb);
        }

        if (r) {
            RemoveEntryList(&r->list_entry);
            InsertTailList(&Vcb->drop_roots, &r->list_entry);
        }
    }

    ExReleaseResourceLite(&Vcb->tree_lock);

    if (NT_SUCCESS(Status)) {
        send_notification_fileref(fr, FILE_NOTIFY_CHANGE_DIR_NAME, FILE_ACTION_ADDED, NULL);
        send_notification_fileref(fr->parent, FILE_NOTIFY_CHANGE_LAST_WRITE, FILE_ACTION_MODIFIED, NULL);
    }

end2:
    if (fr)
        free_fileref(fr);

    return Status;
}

Referenced by fsctl_request().

dismount_volume()

NTSTATUS dismount_volume	(	device_extension *	Vcb,
		bool	shutdown,
		PIRP	Irp
	)

Definition at line 2578 of file fsctl.c.

                                                                         {
    NTSTATUS Status;
    bool open_files;

    TRACE("FSCTL_DISMOUNT_VOLUME\n");

    if (!(Vcb->Vpb->Flags & VPB_MOUNTED))
        return STATUS_SUCCESS;

    if (!shutdown) {
        if (Vcb->disallow_dismount || Vcb->page_file_count != 0) {
            WARN("attempting to dismount boot volume or one containing a pagefile\n");
            return STATUS_ACCESS_DENIED;
        }

        Status = FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_DISMOUNT);
        if (!NT_SUCCESS(Status)) {
            WARN("FsRtlNotifyVolumeEvent returned %08lx\n", Status);
        }
    }

    ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);

    if (!Vcb->locked) {
        flush_fcb_caches(Vcb);

        if (Vcb->need_write && !Vcb->readonly) {
            Status = do_write(Vcb, Irp);

            if (!NT_SUCCESS(Status))
                ERR("do_write returned %08lx\n", Status);
        }
    }

    free_trees(Vcb);

    Vcb->removing = true;

    open_files = Vcb->open_files > 0;

    if (Vcb->vde) {
        update_volumes(Vcb);
        Vcb->vde->mounted_device = NULL;
    }

    ExReleaseResourceLite(&Vcb->tree_lock);

    if (!open_files)
        uninit(Vcb);

    return STATUS_SUCCESS;
}

Referenced by do_shutdown(), and fsctl_request().

do_create_snapshot()

static NTSTATUS do_create_snapshot ( device_extension *  Vcb, PFILE_OBJECT  parent, fcb *  subvol_fcb, PANSI_STRING  utf8, PUNICODE_STRING  name, bool  readonly, PIRP  Irp  )

static

Definition at line 263 of file fsctl.c.

                                                                                                                                                                  {
    LIST_ENTRY rollback;
    uint64_t id;
    NTSTATUS Status;
    root *r, *subvol = subvol_fcb->subvol;
    KEY searchkey;
    traverse_ptr tp;
    uint64_t address, *root_num;
    LARGE_INTEGER time;
    BTRFS_TIME now;
    fcb* fcb = parent->FsContext;
    ccb* ccb = parent->FsContext2;
    LIST_ENTRY* le;
    file_ref *fileref, *fr;
    dir_child* dc = NULL;

    if (!ccb) {
        ERR("error - ccb was NULL\n");
        return STATUS_INTERNAL_ERROR;
    }

    if (!(ccb->access & FILE_ADD_SUBDIRECTORY)) {
        WARN("insufficient privileges\n");
        return STATUS_ACCESS_DENIED;
    }

    fileref = ccb->fileref;

    if (fileref->fcb == Vcb->dummy_fcb)
        return STATUS_ACCESS_DENIED;

    // flush open files on this subvol

    flush_subvol_fcbs(subvol);

    // flush metadata

    if (Vcb->need_write)
        Status = do_write(Vcb, Irp);
    else
        Status = STATUS_SUCCESS;

    free_trees(Vcb);

    if (!NT_SUCCESS(Status)) {
        ERR("do_write returned %08lx\n", Status);
        return Status;
    }

    InitializeListHead(&rollback);

    // create new root

    id = InterlockedIncrement64(&Vcb->root_root->lastinode);
    Status = create_root(Vcb, id, &r, true, Vcb->superblock.generation, Irp);

    if (!NT_SUCCESS(Status)) {
        ERR("create_root returned %08lx\n", Status);
        goto end;
    }

    r->lastinode = subvol->lastinode;

    if (!Vcb->uuid_root) {
        root* uuid_root;

        TRACE("uuid root doesn't exist, creating it\n");

        Status = create_root(Vcb, BTRFS_ROOT_UUID, &uuid_root, false, 0, Irp);

        if (!NT_SUCCESS(Status)) {
            ERR("create_root returned %08lx\n", Status);
            goto end;
        }

        Vcb->uuid_root = uuid_root;
    }

    root_num = ExAllocatePoolWithTag(PagedPool, sizeof(uint64_t), ALLOC_TAG);
    if (!root_num) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    tp.tree = NULL;

    do {
        get_uuid(&r->root_item.uuid);

        RtlCopyMemory(&searchkey.obj_id, &r->root_item.uuid, sizeof(uint64_t));
        searchkey.obj_type = TYPE_SUBVOL_UUID;
        RtlCopyMemory(&searchkey.offset, &r->root_item.uuid.uuid[sizeof(uint64_t)], sizeof(uint64_t));

        Status = find_item(Vcb, Vcb->uuid_root, &tp, &searchkey, false, Irp);
    } while (NT_SUCCESS(Status) && !keycmp(searchkey, tp.item->key));

    *root_num = r->id;

    Status = insert_tree_item(Vcb, Vcb->uuid_root, searchkey.obj_id, searchkey.obj_type, searchkey.offset, root_num, sizeof(uint64_t), NULL, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("insert_tree_item returned %08lx\n", Status);
        ExFreePool(root_num);
        goto end;
    }

    searchkey.obj_id = r->id;
    searchkey.obj_type = TYPE_ROOT_ITEM;
    searchkey.offset = 0xffffffffffffffff;

    Status = find_item(Vcb, Vcb->root_root, &tp, &searchkey, false, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("error - find_item returned %08lx\n", Status);
        goto end;
    }

    Status = snapshot_tree_copy(Vcb, subvol->root_item.block_number, r, &address, Irp, &rollback);
    if (!NT_SUCCESS(Status)) {
        ERR("snapshot_tree_copy returned %08lx\n", Status);
        goto end;
    }

    KeQuerySystemTime(&time);
    win_time_to_unix(time, &now);

    r->root_item.inode.generation = 1;
    r->root_item.inode.st_size = 3;
    r->root_item.inode.st_blocks = subvol->root_item.inode.st_blocks;
    r->root_item.inode.st_nlink = 1;
    r->root_item.inode.st_mode = __S_IFDIR | S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; // 40755
    r->root_item.inode.flags = 0xffffffff80000000; // FIXME - find out what these mean
    r->root_item.generation = Vcb->superblock.generation;
    r->root_item.objid = subvol->root_item.objid;
    r->root_item.block_number = address;
    r->root_item.bytes_used = subvol->root_item.bytes_used;
    r->root_item.last_snapshot_generation = Vcb->superblock.generation;
    r->root_item.root_level = subvol->root_item.root_level;
    r->root_item.generation2 = Vcb->superblock.generation;
    r->root_item.parent_uuid = subvol->root_item.uuid;
    r->root_item.ctransid = subvol->root_item.ctransid;
    r->root_item.otransid = Vcb->superblock.generation;
    r->root_item.ctime = subvol->root_item.ctime;
    r->root_item.otime = now;

    if (readonly)
        r->root_item.flags |= BTRFS_SUBVOL_READONLY;

    r->treeholder.address = address;

    // FIXME - do we need to copy over the send and receive fields too?

    if (tp.item->key.obj_id != searchkey.obj_id || tp.item->key.obj_type != searchkey.obj_type) {
        ERR("error - could not find ROOT_ITEM for subvol %I64x\n", r->id);
        Status = STATUS_INTERNAL_ERROR;
        goto end;
    }

    RtlCopyMemory(tp.item->data, &r->root_item, sizeof(ROOT_ITEM));

    // update ROOT_ITEM of original subvol

    subvol->root_item.last_snapshot_generation = Vcb->superblock.generation;

    mark_subvol_dirty(Vcb, subvol);

    // create fileref for entry in other subvolume

    fr = create_fileref(Vcb);
    if (!fr) {
        ERR("out of memory\n");
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto end;
    }

    Status = open_fcb(Vcb, r, r->root_item.objid, BTRFS_TYPE_DIRECTORY, utf8, false, fcb, &fr->fcb, PagedPool, Irp);
    if (!NT_SUCCESS(Status)) {
        ERR("open_fcb returned %08lx\n", Status);
        free_fileref(fr);
        goto end;
    }

    fr->parent = fileref;

    Status = add_dir_child(fileref->fcb, r->id, true, utf8, name, BTRFS_TYPE_DIRECTORY, &dc);
    if (!NT_SUCCESS(Status))
        WARN("add_dir_child returned %08lx\n", Status);

    fr->dc = dc;
    dc->fileref = fr;

    ExAcquireResourceExclusiveLite(&fileref->fcb->nonpaged->dir_children_lock, true);
    InsertTailList(&fileref->children, &fr->list_entry);
    ExReleaseResourceLite(&fileref->fcb->nonpaged->dir_children_lock);

    increase_fileref_refcount(fileref);

    fr->created = true;
    mark_fileref_dirty(fr);

    if (fr->fcb->type == BTRFS_TYPE_DIRECTORY)
        fr->fcb->fileref = fr;

    fr->fcb->subvol->parent = fileref->fcb->subvol->id;

    free_fileref(fr);

    // change fcb's INODE_ITEM

    fcb->inode_item.transid = Vcb->superblock.generation;
    fcb->inode_item.sequence++;
    fcb->inode_item.st_size += utf8->Length * 2;

    if (!ccb->user_set_change_time)
        fcb->inode_item.st_ctime = now;

    if (!ccb->user_set_write_time)
        fcb->inode_item.st_mtime = now;

    fcb->inode_item_changed = true;
    mark_fcb_dirty(fcb);

    fcb->subvol->root_item.ctime = now;
    fcb->subvol->root_item.ctransid = Vcb->superblock.generation;

    send_notification_fileref(fr, FILE_NOTIFY_CHANGE_DIR_NAME, FILE_ACTION_ADDED, NULL);
    send_notification_fileref(fr->parent, FILE_NOTIFY_CHANGE_LAST_WRITE, FILE_ACTION_MODIFIED, NULL);

    le = subvol->fcbs.Flink;
    while (le != &subvol->fcbs) {
        struct _fcb* fcb2 = CONTAINING_RECORD(le, struct _fcb, list_entry);
        LIST_ENTRY* le2 = fcb2->extents.Flink;

        while (le2 != &fcb2->extents) {
            extent* ext = CONTAINING_RECORD(le2, extent, list_entry);

            if (!ext->ignore)
                ext->unique = false;

            le2 = le2->Flink;
        }

        le = le->Flink;
    }

    Status = do_write(Vcb, Irp);

    free_trees(Vcb);

    if (!NT_SUCCESS(Status))
        ERR("do_write returned %08lx\n", Status);

end:
    if (NT_SUCCESS(Status))
        clear_rollback(&rollback);
    else
        do_rollback(Vcb, &rollback);

    return Status;
}

Referenced by create_snapshot().

do_unlock_volume()

void do_unlock_volume

(

device_extension *

Vcb

)

Definition at line 2320 of file fsctl.c.

                                             {
    KIRQL irql;

    IoAcquireVpbSpinLock(&irql);

    Vcb->locked = false;
    Vcb->Vpb->Flags &= ~VPB_LOCKED;
    Vcb->locked_fileobj = NULL;

    IoReleaseVpbSpinLock(irql);

    if (Vcb->lock_paused_balance)
        KeSetEvent(&Vcb->balance.event, 0, false);
}

Referenced by _Dispatch_type_(), and unlock_volume().

duplicate_extents()

static NTSTATUS duplicate_extents ( device_extension *  Vcb, PFILE_OBJECT  FileObject, void *  data, ULONG  datalen, PIRP  Irp  )

static

Definition at line 3256 of file fsctl.c.

                                                                                                                       {
    DUPLICATE_EXTENTS_DATA* ded = (DUPLICATE_EXTENTS_DATA*)data;
    fcb *fcb = FileObject ? FileObject->FsContext : NULL, *sourcefcb;
    ccb *ccb = FileObject ? FileObject->FsContext2 : NULL, *sourceccb;
    NTSTATUS Status;
    PFILE_OBJECT sourcefo;
    uint64_t sourcelen, nbytes = 0;
    LIST_ENTRY rollback, *le, newexts;
    LARGE_INTEGER time;
    BTRFS_TIME now;
    bool make_inline;

    if (!ded || datalen < sizeof(DUPLICATE_EXTENTS_DATA))
        return STATUS_BUFFER_TOO_SMALL;

    if (Vcb->readonly)
        return STATUS_MEDIA_WRITE_PROTECTED;

    if (ded->ByteCount.QuadPart == 0)
        return STATUS_SUCCESS;

    if (!fcb || !ccb || fcb == Vcb->volume_fcb)
        return STATUS_INVALID_PARAMETER;

    if (is_subvol_readonly(fcb->subvol, Irp))
        return STATUS_ACCESS_DENIED;

    if (Irp->RequestorMode == UserMode && !(ccb->access & FILE_WRITE_DATA)) {
        WARN("insufficient privileges\n");
        return STATUS_ACCESS_DENIED;
    }

    if (!fcb->ads && fcb->type != BTRFS_TYPE_FILE && fcb->type != BTRFS_TYPE_SYMLINK)
        return STATUS_INVALID_PARAMETER;

    Status = ObReferenceObjectByHandle(ded->FileHandle, 0, *IoFileObjectType, Irp->RequestorMode, (void**)&sourcefo, NULL);
    if (!NT_SUCCESS(Status)) {
        ERR("ObReferenceObjectByHandle returned %08lx\n", Status);
        return Status;
    }

    if (sourcefo->DeviceObject != FileObject->DeviceObject) {
        WARN("source and destination are on different volumes\n");
        ObDereferenceObject(sourcefo);
        return STATUS_INVALID_PARAMETER;
    }

    sourcefcb = sourcefo->FsContext;
    sourceccb = sourcefo->FsContext2;

    if (!sourcefcb || !sourceccb || sourcefcb == Vcb->volume_fcb) {
        ObDereferenceObject(sourcefo);
        return STATUS_INVALID_PARAMETER;
    }

    if (!sourcefcb->ads && !fcb->ads) {
        if ((ded->SourceFileOffset.QuadPart & (Vcb->superblock.sector_size - 1)) || (ded->TargetFileOffset.QuadPart & (Vcb->superblock.sector_size - 1))) {
            ObDereferenceObject(sourcefo);
            return STATUS_INVALID_PARAMETER;
        }

        if (ded->ByteCount.QuadPart & (Vcb->superblock.sector_size - 1)) {
            ObDereferenceObject(sourcefo);
            return STATUS_INVALID_PARAMETER;
        }
    }

    if (Irp->RequestorMode == UserMode && (!(sourceccb->access & FILE_READ_DATA) || !(sourceccb->access & FILE_READ_ATTRIBUTES))) {
        WARN("insufficient privileges\n");
        ObDereferenceObject(sourcefo);
        return STATUS_ACCESS_DENIED;
    }

    if (!sourcefcb->ads && sourcefcb->type != BTRFS_TYPE_FILE && sourcefcb->type != BTRFS_TYPE_SYMLINK) {
        ObDereferenceObject(sourcefo);
        return STATUS_INVALID_PARAMETER;
    }

    sourcelen = sourcefcb->ads ? sourcefcb->adsdata.Length : sourcefcb->inode_item.st_size;

    if (sector_align(sourcelen, Vcb->superblock.sector_size) < (uint64_t)ded->SourceFileOffset.QuadPart + (uint64_t)ded->ByteCount.QuadPart) {
        ObDereferenceObject(sourcefo);
        return STATUS_NOT_SUPPORTED;
    }

    if (fcb == sourcefcb &&
        ((ded->SourceFileOffset.QuadPart >= ded->TargetFileOffset.QuadPart && ded->SourceFileOffset.QuadPart < ded->TargetFileOffset.QuadPart + ded->ByteCount.QuadPart) ||
        (ded->TargetFileOffset.QuadPart >= ded->SourceFileOffset.QuadPart && ded->TargetFileOffset.QuadPart < ded->SourceFileOffset.QuadPart + ded->ByteCount.QuadPart))) {
        WARN("source and destination are the same, and the ranges overlap\n");
        ObDereferenceObject(sourcefo);
        return STATUS_INVALID_PARAMETER;
    }

    // fail if nocsum flag set on one file but not the other
    if (!fcb->ads && !sourcefcb->ads && (fcb->inode_item.flags & BTRFS_INODE_NODATASUM) != (sourcefcb->inode_item.flags & BTRFS_INODE_NODATASUM)) {
        ObDereferenceObject(sourcefo);
        return STATUS_INVALID_PARAMETER;
    }

    InitializeListHead(&rollback);
    InitializeListHead(&newexts);

    ExAcquireResourceSharedLite(&Vcb->tree_lock, true);

    ExAcquireResourceExclusiveLite(fcb->Header.Resource, true);

    if (fcb != sourcefcb)
        ExAcquireResourceSharedLite(sourcefcb->Header.Resource, true);

    if (!FsRtlFastCheckLockForWrite(&fcb->lock, &ded->TargetFileOffset, &ded->ByteCount, 0, FileObject, PsGetCurrentProcess())) {
        Status = STATUS_FILE_LOCK_CONFLICT;
        goto end;
    }

    if (!FsRtlFastCheckLockForRead(&sourcefcb->lock, &ded->SourceFileOffset, &ded->ByteCount, 0, FileObject, PsGetCurrentProcess())) {
        Status = STATUS_FILE_LOCK_CONFLICT;
        goto end;
    }

    make_inline = fcb->ads ? false : (fcb->inode_item.st_size <= Vcb->options.max_inline || fcb_is_inline(fcb));

    if (fcb->ads || sourcefcb->ads || make_inline || fcb_is_inline(sourcefcb)) {
        uint8_t* data2;
        ULONG bytes_read, dataoff, datalen2;

        if (make_inline) {
            dataoff = (ULONG)ded->TargetFileOffset.QuadPart;
            datalen2 = (ULONG)fcb->inode_item.st_size;
        } else if (fcb->ads) {
            dataoff = 0;
            datalen2 = (ULONG)ded->ByteCount.QuadPart;
        } else {
            dataoff = ded->TargetFileOffset.QuadPart % Vcb->superblock.sector_size;
            datalen2 = (ULONG)sector_align(ded->ByteCount.QuadPart + dataoff, Vcb->superblock.sector_size);
        }

        data2 = ExAllocatePoolWithTag(PagedPool, datalen2, ALLOC_TAG);
        if (!data2) {
            ERR("out of memory\n");
            Status = STATUS_INSUFFICIENT_RESOURCES;
            goto end;
        }

        if (dataoff > 0) {
            if (make_inline)
                Status = read_file(fcb, data2, 0, datalen2, NULL, Irp);
            else
                Status = read_file(fcb, data2, ded->TargetFileOffset.QuadPart - dataoff, dataoff, NULL, Irp);

            if (!NT_SUCCESS(Status)) {
                ERR("read_file returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }
        }

        if (sourcefcb->ads) {
            Status = read_stream(sourcefcb, data2 + dataoff, ded->SourceFileOffset.QuadPart, (ULONG)ded->ByteCount.QuadPart, &bytes_read);
            if (!NT_SUCCESS(Status)) {
                ERR("read_stream returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }
        } else {
            Status = read_file(sourcefcb, data2 + dataoff, ded->SourceFileOffset.QuadPart, ded->ByteCount.QuadPart, &bytes_read, Irp);
            if (!NT_SUCCESS(Status)) {
                ERR("read_file returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }
        }

        if (dataoff + bytes_read < datalen2)
            RtlZeroMemory(data2 + dataoff + bytes_read, datalen2 - bytes_read);

        if (fcb->ads)
            RtlCopyMemory(&fcb->adsdata.Buffer[ded->TargetFileOffset.QuadPart], data2, (USHORT)min(ded->ByteCount.QuadPart, fcb->adsdata.Length - ded->TargetFileOffset.QuadPart));
        else if (make_inline) {
            uint16_t edsize;
            EXTENT_DATA* ed;

            Status = excise_extents(Vcb, fcb, 0, sector_align(fcb->inode_item.st_size, Vcb->superblock.sector_size), Irp, &rollback);
            if (!NT_SUCCESS(Status)) {
                ERR("excise_extents returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }

            edsize = (uint16_t)(offsetof(EXTENT_DATA, data[0]) + datalen2);

            ed = ExAllocatePoolWithTag(PagedPool, edsize, ALLOC_TAG);
            if (!ed) {
                ERR("out of memory\n");
                ExFreePool(data2);
                Status = STATUS_INSUFFICIENT_RESOURCES;
                goto end;
            }

            ed->generation = Vcb->superblock.generation;
            ed->decoded_size = fcb->inode_item.st_size;
            ed->compression = BTRFS_COMPRESSION_NONE;
            ed->encryption = BTRFS_ENCRYPTION_NONE;
            ed->encoding = BTRFS_ENCODING_NONE;
            ed->type = EXTENT_TYPE_INLINE;

            RtlCopyMemory(ed->data, data2, datalen2);

            Status = add_extent_to_fcb(fcb, 0, ed, edsize, false, NULL, &rollback);
            if (!NT_SUCCESS(Status)) {
                ERR("add_extent_to_fcb returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }

            fcb->inode_item.st_blocks += datalen2;
        } else {
            uint64_t start = ded->TargetFileOffset.QuadPart - (ded->TargetFileOffset.QuadPart % Vcb->superblock.sector_size);

            Status = do_write_file(fcb, start, start + datalen2, data2, Irp, false, 0, &rollback);
            if (!NT_SUCCESS(Status)) {
                ERR("do_write_file returned %08lx\n", Status);
                ExFreePool(data2);
                goto end;
            }
        }

        ExFreePool(data2);
    } else {
        LIST_ENTRY* lastextle;

        le = sourcefcb->extents.Flink;
        while (le != &sourcefcb->extents) {
            extent* ext = CONTAINING_RECORD(le, extent, list_entry);

            if (!ext->ignore) {
                if (ext->offset >= (uint64_t)ded->SourceFileOffset.QuadPart + (uint64_t)ded->ByteCount.QuadPart)
                    break;

                if (ext->extent_data.type != EXTENT_TYPE_INLINE) {
                    ULONG extlen = offsetof(extent, extent_data) + sizeof(EXTENT_DATA) - 1 + sizeof(EXTENT_DATA2);
                    extent* ext2;
                    EXTENT_DATA2 *ed2s, *ed2d;
                    chunk* c;

                    ed2s = (EXTENT_DATA2*)ext->extent_data.data;

                    if (ext->offset + ed2s->num_bytes <= (uint64_t)ded->SourceFileOffset.QuadPart) {
                        le = le->Flink;
                        continue;
                    }

                    ext2 = ExAllocatePoolWithTag(PagedPool, extlen, ALLOC_TAG);
                    if (!ext2) {
                        ERR("out of memory\n");
                        Status = STATUS_INSUFFICIENT_RESOURCES;
                        goto end;
                    }

                    if (ext->offset < (uint64_t)ded->SourceFileOffset.QuadPart)
                        ext2->offset = ded->TargetFileOffset.QuadPart;
                    else
                        ext2->offset = ext->offset - ded->SourceFileOffset.QuadPart + ded->TargetFileOffset.QuadPart;

                    ext2->datalen = sizeof(EXTENT_DATA) - 1 + sizeof(EXTENT_DATA2);
                    ext2->unique = false;
                    ext2->ignore = false;
                    ext2->inserted = true;

                    ext2->extent_data.generation = Vcb->superblock.generation;
                    ext2->extent_data.decoded_size = ext->extent_data.decoded_size;
                    ext2->extent_data.compression = ext->extent_data.compression;
                    ext2->extent_data.encryption = ext->extent_data.encryption;
                    ext2->extent_data.encoding = ext->extent_data.encoding;
                    ext2->extent_data.type = ext->extent_data.type;

                    ed2d = (EXTENT_DATA2*)ext2->extent_data.data;

                    ed2d->address = ed2s->address;
                    ed2d->size = ed2s->size;

                    if (ext->offset < (uint64_t)ded->SourceFileOffset.QuadPart) {
                        ed2d->offset = ed2s->offset + ded->SourceFileOffset.QuadPart - ext->offset;
                        ed2d->num_bytes = min((uint64_t)ded->ByteCount.QuadPart, ed2s->num_bytes + ext->offset - ded->SourceFileOffset.QuadPart);
                    } else {
                        ed2d->offset = ed2s->offset;
                        ed2d->num_bytes = min(ded->SourceFileOffset.QuadPart + ded->ByteCount.QuadPart - ext->offset, ed2s->num_bytes);
                    }

                    if (ext->csum) {
                        if (ext->extent_data.compression == BTRFS_COMPRESSION_NONE) {
                            ext2->csum = ExAllocatePoolWithTag(PagedPool, (ULONG)(ed2d->num_bytes * Vcb->csum_size / Vcb->superblock.sector_size), ALLOC_TAG);
                            if (!ext2->csum) {
                                ERR("out of memory\n");
                                Status = STATUS_INSUFFICIENT_RESOURCES;
                                ExFreePool(ext2);
                                goto end;
                            }

                            RtlCopyMemory(ext2->csum, (uint8_t*)ext->csum + ((ed2d->offset - ed2s->offset) * Vcb->csum_size / Vcb->superblock.sector_size),
                                          (ULONG)(ed2d->num_bytes * Vcb->csum_size / Vcb->superblock.sector_size));
                        } else {
                            ext2->csum = ExAllocatePoolWithTag(PagedPool, (ULONG)(ed2d->size * Vcb->csum_size / Vcb->superblock.sector_size), ALLOC_TAG);
                            if (!ext2->csum) {
                                ERR("out of memory\n");
                                Status = STATUS_INSUFFICIENT_RESOURCES;
                                ExFreePool(ext2);
                                goto end;
                            }

                            RtlCopyMemory(ext2->csum, ext->csum, (ULONG)(ed2s->size * Vcb->csum_size / Vcb->superblock.sector_size));
                        }
                    } else
                        ext2->csum = NULL;

                    InsertTailList(&newexts, &ext2->list_entry);

                    c = get_chunk_from_address(Vcb, ed2s->address);
                    if (!c) {
                        ERR("get_chunk_from_address(%I64x) failed\n", ed2s->address);
                        Status = STATUS_INTERNAL_ERROR;
                        goto end;
                    }

                    Status = update_changed_extent_ref(Vcb, c, ed2s->address, ed2s->size, fcb->subvol->id, fcb->inode, ext2->offset - ed2d->offset,
                                                    1, fcb->inode_item.flags & BTRFS_INODE_NODATASUM, false, Irp);
                    if (!NT_SUCCESS(Status)) {
                        ERR("update_changed_extent_ref returned %08lx\n", Status);
                        goto end;
                    }

                    nbytes += ed2d->num_bytes;
                }
            }

            le = le->Flink;
        }

        Status = excise_extents(Vcb, fcb, ded->TargetFileOffset.QuadPart, ded->TargetFileOffset.QuadPart + ded->ByteCount.QuadPart, Irp, &rollback);
        if (!NT_SUCCESS(Status)) {
            ERR("excise_extents returned %08lx\n", Status);

            while (!IsListEmpty(&newexts)) {
                extent* ext = CONTAINING_RECORD(RemoveHeadList(&newexts), extent, list_entry);
                ExFreePool(ext);
            }

            goto end;
        }

        // clear unique flags in source fcb
        le = sourcefcb->extents.Flink;
        while (le != &sourcefcb->extents) {
            extent* ext = CONTAINING_RECORD(le, extent, list_entry);

            if (!ext->ignore && ext->unique && (ext->extent_data.type == EXTENT_TYPE_REGULAR || ext->extent_data.type == EXTENT_TYPE_PREALLOC)) {
                EXTENT_DATA2* ed2s = (EXTENT_DATA2*)ext->extent_data.data;
                LIST_ENTRY* le2;

                le2 = newexts.Flink;
                while (le2 != &newexts) {
                    extent* ext2 = CONTAINING_RECORD(le2, extent, list_entry);

                    if (ext2->extent_data.type == EXTENT_TYPE_REGULAR || ext2->extent_data.type == EXTENT_TYPE_PREALLOC) {
                        EXTENT_DATA2* ed2d = (EXTENT_DATA2*)ext2->extent_data.data;

                        if (ed2d->address == ed2s->address && ed2d->size == ed2s->size) {
                            ext->unique = false;
                            break;
                        }
                    }

                    le2 = le2->Flink;
                }
            }

            le = le->Flink;
        }

        lastextle = &fcb->extents;
        while (!IsListEmpty(&newexts)) {
            extent* ext = CONTAINING_RECORD(RemoveHeadList(&newexts), extent, list_entry);

            add_extent(fcb, lastextle, ext);
            lastextle = &ext->list_entry;
        }
    }

    KeQuerySystemTime(&time);
    win_time_to_unix(time, &now);

    if (fcb->ads) {
        ccb->fileref->parent->fcb->inode_item.sequence++;

        if (!ccb->user_set_change_time)
            ccb->fileref->parent->fcb->inode_item.st_ctime = now;

        ccb->fileref->parent->fcb->inode_item_changed = true;
        mark_fcb_dirty(ccb->fileref->parent->fcb);
    } else {
        fcb->inode_item.st_blocks += nbytes;
        fcb->inode_item.sequence++;

        if (!ccb->user_set_change_time)
            fcb->inode_item.st_ctime = now;

        if (!ccb->user_set_write_time) {
            fcb->inode_item.st_mtime = now;
            queue_notification_fcb(ccb->fileref, FILE_NOTIFY_CHANGE_LAST_WRITE, FILE_ACTION_MODIFIED, NULL);
        }

        fcb->inode_item_changed = true;
        fcb->extents_changed = true;
    }

    mark_fcb_dirty(fcb);

    if (FileObject->SectionObjectPointer->DataSectionObject)
        CcPurgeCacheSection(FileObject->SectionObjectPointer, &ded->TargetFileOffset, (ULONG)ded->ByteCount.QuadPart, false);

    Status = STATUS_SUCCESS;

end:
    ObDereferenceObject(sourcefo);

    if (NT_SUCCESS(Status))
        clear_rollback(&rollback);
    else
        do_rollback(Vcb, &rollback);

    if (fcb != sourcefcb)
        ExReleaseResourceLite(sourcefcb->Header.Resource);

    ExReleaseResourceLite(fcb->Header.Resource);

    ExReleaseResourceLite(&Vcb->tree_lock);

    return Status;
}

Referenced by fsctl_request().

fcb_is_inline()

bool fcb_is_inline

(

fcb *

fcb

)

Definition at line 3240 of file fsctl.c.

                             {
    LIST_ENTRY* le;

    le = fcb->extents.Flink;
    while (le != &fcb->extents) {
        extent* ext = CONTAINING_RECORD(le, extent, list_entry);

        if (!ext->ignore)
            return ext->extent_data.type == EXTENT_TYPE_INLINE;

        le = le->Flink;
    }

    return false;
}

Referenced by duplicate_extents(), truncate_file(), write_file2(), and zero_data().

find_subvol()

static NTSTATUS find_subvol ( device_extension *  Vcb, void *  in, ULONG  inlen, void *  out, ULONG  outlen, PIRP  Irp  )

static

Definition at line 4545 of file fsctl.c.

                                                                                                             {
    btrfs_find_subvol* bfs;
    NTSTATUS Status;
    traverse_ptr tp;
    KEY searchkey;

    if (!in || inlen < sizeof(btrfs_find_subvol))
        return STATUS_INVALID_PARAMETER;

    if (!out || outlen < sizeof(WCHAR))
        return STATUS_INVALID_PARAMETER;

    if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), Irp->RequestorMode))
        return STATUS_PRIVILEGE_NOT_HELD;

    bfs = (btrfs_find_subvol*)in;

    ExAcquireResourceSharedLite(&Vcb->tree_lock, true);

    if (!Vcb->uuid_root) {
        ERR("couldn't find uuid root\n");
        Status = STATUS_NOT_FOUND;
        goto end;
    }

    RtlCopyMemory(&searchkey.obj_id, &bfs->uuid, sizeof(uint64_t));
    searchkey.obj_type = TYPE_SUBVOL_UUID;
    RtlCopyMemory(&searchkey.offset, &bfs->uuid.uuid[sizeof(uint64_t)], sizeof(uint64_t));

    Status = find_item(Vcb, Vcb->uuid_root, &tp, &searchkey, false, Irp);

    if (!NT_SUCCESS(Status)) {
        ERR("find_item returned %08lx\n", Status);
        goto end;
    }

    if (!keycmp(searchkey, tp.item->key) && tp.item->size >= sizeof(uint64_t)) {
        uint64_t* id = (uint64_t*)tp.item->data;

        if (bfs->ctransid != 0) {
            KEY searchkey2;
            traverse_ptr tp2;

            searchkey2.obj_id = *id;
            searchkey2.obj_type = TYPE_ROOT_ITEM;
            searchkey2.offset = 0xffffffffffffffff;

            Status = find_item(Vcb, Vcb->root_root, &tp2, &searchkey2, false, Irp);
            if (!NT_SUCCESS(Status)) {
                ERR("find_item returned %08lx\n", Status);
                goto end;
            }

            if (tp2.item->key.obj_id == searchkey2.obj_id && tp2.item->key.obj_type == searchkey2.obj_type &&
                tp2.item->size >= offsetof(ROOT_ITEM, otransid)) {
                ROOT_ITEM* ri = (ROOT_ITEM*)tp2.item->data;

                if (ri->ctransid == bfs->ctransid) {
                    TRACE("found subvol %I64x\n", *id);
                    Status = get_subvol_path(Vcb, *id, out, outlen, Irp);
                    goto end;
                }
            }
        } else {
            TRACE("found subvol %I64x\n", *id);
            Status = get_subvol_path(Vcb, *id, out, outlen, Irp);
            goto end;
        }
    }

    searchkey.obj_type = TYPE_SUBVOL_REC_UUID;

    Status = find_item(Vcb, Vcb->uuid_root, &tp, &searchkey, false, Irp);

    if (!NT_SUCCESS(Status)) {
        ERR("find_item returned %08lx\n", Status);
        goto end;
    }

    if (!keycmp(searchkey, tp.item->key) && tp.item->size >= sizeof(uint64_t)) {
        uint64_t* ids = (uint64_t*)tp.item->data;
        ULONG i;

        for (i = 0; i < tp.item->size / sizeof(uint64_t); i++) {
            if (bfs->ctransid != 0) {
                KEY searchkey2;
                traverse_ptr tp2;

                searchkey2.obj_id = ids[i];
                searchkey2.obj_type = TYPE_ROOT_ITEM;
                searchkey2.offset = 0xffffffffffffffff;

                Status = find_item(Vcb, Vcb->root_root, &tp2, &searchkey2, false, Irp);
                if (!NT_SUCCESS(Status)) {
                    ERR("find_item returned %08lx\n", Status);
                    goto end;
                }

                if (tp2.item->key.obj_id == searchkey2.obj_id && tp2.item->key.obj_type == searchkey2.obj_type &&
                    tp2.item->size >= offsetof(ROOT_ITEM, otransid)) {
                    ROOT_ITEM* ri = (ROOT_ITEM*)tp2.item->data;

                    if (ri->ctransid == bfs->ctransid) {
                        TRACE("found subvol %I64x\n", ids[i]);
                        Status = get_subvol_path(Vcb, ids[i], out, outlen, Irp);
                        goto end;
                    }
                }
            } else {
                TRACE("found subvol %I64x\n", ids[i]);
                Status = get_subvol_path(Vcb, ids[i], out, outlen, Irp);
                goto end;
            }
        }
    }

    Status = STATUS_NOT_FOUND;

end:
    ExReleaseResourceLite(&Vcb->tree_lock);

    return Status;
}

Referenced by fsctl_request().

flush_fcb_caches()

static void flush_fcb_caches ( device_extension *  Vcb )

static

Definition at line 2216 of file fsctl.c.

                                                    {
    LIST_ENTRY* le;

    le = Vcb->all_fcbs.Flink;
    while (le != &Vcb->all_fcbs) {
        struct _fcb* fcb = CONTAINING_RECORD(le, struct _fcb, list_entry_all);
        IO_STATUS_BLOCK iosb;

        if (fcb->type != BTRFS_TYPE_DIRECTORY && !fcb->deleted)
            CcFlushCache(&fcb->nonpaged->segment_object, NULL, 0, &iosb);

        le = le->Flink;
    }
}

Referenced by dismount_volume(), invalidate_volumes(), and lock_volume().

flush_subvol_fcbs()

void flush_subvol_fcbs

(

root *

subvol

)

Definition at line 246 of file fsctl.c.

                                     {
    LIST_ENTRY* le = subvol->fcbs.Flink;

    if (IsListEmpty(&subvol->fcbs))
        return;

    while (le != &subvol->fcbs) {
        struct _fcb* fcb = CONTAINING_RECORD(le, struct _fcb, list_entry);
        IO_STATUS_BLOCK iosb;

        if (fcb->type != BTRFS_TYPE_DIRECTORY && !fcb->deleted)
            CcFlushCache(&fcb->nonpaged->segment_object, NULL, 0, &iosb);

        le = le->Flink;
    }
}

Referenced by _Function_class_(), and do_create_snapshot().

fs_get_statistics()

static NTSTATUS fs_get_statistics ( void *  buffer, DWORD  buflen, ULONG_PTR *  retlen  )

static

Definition at line 1699 of file fsctl.c.

                                                                                 {
    FILESYSTEM_STATISTICS* fss;

    WARN("STUB: FSCTL_FILESYSTEM_GET_STATISTICS\n");

    // This is hideously wrong, but at least it stops SMB from breaking

    if (buflen < sizeof(FILESYSTEM_STATISTICS))
        return STATUS_BUFFER_TOO_SMALL;

    fss = buffer;
    RtlZeroMemory(fss, sizeof(FILESYSTEM_STATISTICS));

    fss->Version = 1;
    fss->FileSystemType = FILESYSTEM_STATISTICS_TYPE_NTFS;
    fss->SizeOfCompleteStructure = sizeof(FILESYSTEM_STATISTICS);

    *retlen = sizeof(FILESYSTEM_STATISTICS);

    return STATUS_SUCCESS;
}

Referenced by fsctl_request().

fsctl_get_xattrs()

static NTSTATUS fsctl_get_xattrs ( device_extension *  Vcb, PFILE_OBJECT  FileObject, void *  data, ULONG  datalen, KPROCESSOR_MODE  processor_mode  )

static

Definition at line 4129 of file fsctl.c.

                                                                                                                                            {
    LIST_ENTRY* le;
    btrfs_set_xattr* bsxa;
    ULONG reqlen = (ULONG)offsetof(btrfs_set_xattr, data[0]);
    fcb* fcb;
    ccb* ccb;

    if (!data || datalen < reqlen)
        return STATUS_INVALID_PARAMETER;

    if (!FileObject || !FileObject->FsContext || !FileObject->FsContext2 || FileObject->FsContext == Vcb->volume_fcb)
        return STATUS_INVALID_PARAMETER;

    fcb = FileObject->FsContext;
    ccb = FileObject->FsContext2;

    if (!(ccb->access & (FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES)) && processor_mode == UserMode) {
        WARN("insufficient privileges\n");
        return STATUS_ACCESS_DENIED;
    }

    ExAcquireResourceSharedLite(fcb->Header.Resource, true);

    le = fcb->xattrs.Flink;
    while (le != &fcb->xattrs) {
        xattr* xa = CONTAINING_RECORD(le, xattr, list_entry);

        if (xa->valuelen > 0)
            reqlen += (ULONG)offsetof(btrfs_set_xattr, data[0]) + xa->namelen + xa->valuelen;

        le = le->Flink;
    }

    if (datalen < reqlen) {
        ExReleaseResourceLite(fcb->Header.Resource);
        return STATUS_BUFFER_OVERFLOW;
    }

    bsxa = (btrfs_set_xattr*)data;

    if (reqlen > 0) {
        le = fcb->xattrs.Flink;
        while (le != &fcb->xattrs) {
            xattr* xa = CONTAINING_RECORD(le, xattr, list_entry);

            if (xa->valuelen > 0) {
                bsxa->namelen = xa->namelen;
                bsxa->valuelen = xa->valuelen;
                memcpy(bsxa->data, xa->data, xa->namelen + xa->valuelen);

                bsxa = (btrfs_set_xattr*)&bsxa->data[xa->namelen + xa->valuelen];
            }

            le = le->Flink;
        }
    }

    bsxa->namelen = 0;
    bsxa->valuelen = 0;

    ExReleaseResourceLite(fcb->Header.Resource);

    return STATUS_SUCCESS;
}

Referenced by fsctl_request().

fsctl_oplock()

static NTSTATUS fsctl_oplock ( device_extension *  Vcb, PIRP *  Pirp  )

static

Definition at line 4854 of file fsctl.c.

                                                                {
    NTSTATUS Status;
    PIRP Irp = *Pirp;
    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
    uint32_t fsctl = IrpSp->Parameters.FileSystemControl.FsControlCode;
    PFILE_OBJECT FileObject = IrpSp->FileObject;
    fcb* fcb = FileObject ? FileObject->FsContext : NULL;
    ccb* ccb = FileObject ? FileObject->FsContext2 : NULL;
    file_ref* fileref = ccb ? ccb->fileref : NULL;
#if (NTDDI_VERSION >= NTDDI_WIN7)
    PREQUEST_OPLOCK_INPUT_BUFFER buf = NULL;
    bool oplock_request = false, oplock_ack = false;
#else
    bool oplock_request = false;
#endif
    ULONG oplock_count = 0;
#ifdef __REACTOS__
    bool shared_request;
#endif

    if (!fcb) {
        ERR("fcb was NULL\n");
        return STATUS_INVALID_PARAMETER;
    }

    if (!fileref) {
        ERR("fileref was NULL\n");
        return STATUS_INVALID_PARAMETER;
    }

    if (fcb->type != BTRFS_TYPE_FILE && fcb->type != BTRFS_TYPE_DIRECTORY)
        return STATUS_INVALID_PARAMETER;

#if (NTDDI_VERSION >= NTDDI_WIN7)
    if (fsctl == FSCTL_REQUEST_OPLOCK) {
        if (IrpSp->Parameters.FileSystemControl.InputBufferLength < sizeof(REQUEST_OPLOCK_INPUT_BUFFER))
            return STATUS_BUFFER_TOO_SMALL;

        if (IrpSp->Parameters.FileSystemControl.OutputBufferLength < sizeof(REQUEST_OPLOCK_OUTPUT_BUFFER))
            return STATUS_BUFFER_TOO_SMALL;

        buf = Irp->AssociatedIrp.SystemBuffer;

        // flags are mutually exclusive
        if (buf->Flags & REQUEST_OPLOCK_INPUT_FLAG_REQUEST && buf->Flags & REQUEST_OPLOCK_INPUT_FLAG_ACK)
            return STATUS_INVALID_PARAMETER;

        oplock_request = buf->Flags & REQUEST_OPLOCK_INPUT_FLAG_REQUEST;
        oplock_ack = buf->Flags & REQUEST_OPLOCK_INPUT_FLAG_ACK;

        if (!oplock_request && !oplock_ack)
            return STATUS_INVALID_PARAMETER;
    }
#endif

#if (NTDDI_VERSION >= NTDDI_WIN7)
    bool shared_request = (fsctl == FSCTL_REQUEST_OPLOCK_LEVEL_2) || (fsctl == FSCTL_REQUEST_OPLOCK && !(buf->RequestedOplockLevel & OPLOCK_LEVEL_CACHE_WRITE));
#else
    shared_request = (fsctl == FSCTL_REQUEST_OPLOCK_LEVEL_2);
#endif

#if (NTDDI_VERSION >= NTDDI_WIN7)
    if (fcb->type == BTRFS_TYPE_DIRECTORY && (fsctl != FSCTL_REQUEST_OPLOCK || !shared_request)) {
#else
    if (fcb->type == BTRFS_TYPE_DIRECTORY && !shared_request) {
#endif
        WARN("oplock requests on directories can only be for read or read-handle oplocks\n");
        return STATUS_INVALID_PARAMETER;
    }

    ExAcquireResourceSharedLite(&Vcb->tree_lock, true);

    if (fsctl == FSCTL_REQUEST_OPLOCK_LEVEL_1 || fsctl == FSCTL_REQUEST_BATCH_OPLOCK || fsctl == FSCTL_REQUEST_FILTER_OPLOCK ||
        fsctl == FSCTL_REQUEST_OPLOCK_LEVEL_2 || oplock_request) {
        ExAcquireResourceExclusiveLite(fcb->Header.Resource, true);

        if (shared_request) {
            if (fcb->type == BTRFS_TYPE_FILE) {
                if (fFsRtlCheckLockForOplockRequest)
                    oplock_count = !fFsRtlCheckLockForOplockRequest(&fcb->lock, &fcb->Header.AllocationSize);
                else if (fFsRtlAreThereCurrentOrInProgressFileLocks)
                    oplock_count = fFsRtlAreThereCurrentOrInProgressFileLocks(&fcb->lock);
                else
                    oplock_count = FsRtlAreThereCurrentFileLocks(&fcb->lock);
            }
        } else
            oplock_count = fileref->open_count;
    } else
        ExAcquireResourceSharedLite(fcb->Header.Resource, true);

#if (NTDDI_VERSION >= NTDDI_WIN7)
    if ((fsctl == FSCTL_REQUEST_FILTER_OPLOCK || fsctl == FSCTL_REQUEST_BATCH_OPLOCK ||
        (fsctl == FSCTL_REQUEST_OPLOCK && buf->RequestedOplockLevel & OPLOCK_LEVEL_CACHE_HANDLE)) &&
#else
    if ((fsctl == FSCTL_REQUEST_FILTER_OPLOCK || fsctl == FSCTL_REQUEST_BATCH_OPLOCK) &&
#endif
        fileref->delete_on_close) {
        ExReleaseResourceLite(fcb->Header.Resource);
        ExReleaseResourceLite(&Vcb->tree_lock);
        return STATUS_DELETE_PENDING;
    }

    Status = FsRtlOplockFsctrl(fcb_oplock(fcb), Irp, oplock_count);

    *Pirp = NULL;

    fcb->Header.IsFastIoPossible = fast_io_possible(fcb);

    ExReleaseResourceLite(fcb->Header.Resource);
    ExReleaseResourceLite(&Vcb->tree_lock);

    return Status;
}

Referenced by fsctl_request().

fsctl_request()

NTSTATUS fsctl_request	(	PDEVICE_OBJECT	DeviceObject,
		PIRP *	Pirp,
		uint32_t	type
	)

Definition at line 4968 of file fsctl.c.

                                                                               {
    PIRP Irp = *Pirp;
    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS Status;

    if (IrpSp->FileObject && IrpSp->FileObject->FsContext) {
        device_extension* Vcb = DeviceObject->DeviceExtension;

        if (Vcb->type == VCB_TYPE_FS)
            FsRtlCheckOplock(fcb_oplock(IrpSp->FileObject->FsContext), Irp, NULL, NULL, NULL);
    }

    switch (type) {
        case FSCTL_REQUEST_OPLOCK_LEVEL_1:
        case FSCTL_REQUEST_OPLOCK_LEVEL_2:
        case FSCTL_REQUEST_BATCH_OPLOCK:
        case FSCTL_OPLOCK_BREAK_ACKNOWLEDGE:
        case FSCTL_OPBATCH_ACK_CLOSE_PENDING:
        case FSCTL_OPLOCK_BREAK_NOTIFY:
        case FSCTL_OPLOCK_BREAK_ACK_NO_2:
        case FSCTL_REQUEST_FILTER_OPLOCK:
#if (NTDDI_VERSION >= NTDDI_WIN7)
        case FSCTL_REQUEST_OPLOCK:
#endif
            Status = fsctl_oplock(DeviceObject->DeviceExtension, Pirp);
            break;

        case FSCTL_LOCK_VOLUME:
            Status = lock_volume(DeviceObject->DeviceExtension, Irp);
            break;

        case FSCTL_UNLOCK_VOLUME:
            Status = unlock_volume(DeviceObject->DeviceExtension, Irp);
            break;

        case FSCTL_DISMOUNT_VOLUME:
            Status = dismount_volume(DeviceObject->DeviceExtension, false, Irp);
            break;

        case FSCTL_IS_VOLUME_MOUNTED:
            Status = is_volume_mounted(DeviceObject->DeviceExtension, Irp);
            break;

        case FSCTL_IS_PATHNAME_VALID:
            WARN("STUB: FSCTL_IS_PATHNAME_VALID\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_MARK_VOLUME_DIRTY:
            WARN("STUB: FSCTL_MARK_VOLUME_DIRTY\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_QUERY_RETRIEVAL_POINTERS:
            WARN("STUB: FSCTL_QUERY_RETRIEVAL_POINTERS\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_GET_COMPRESSION:
            Status = get_compression(Irp);
            break;

        case FSCTL_SET_COMPRESSION:
            Status = set_compression(Irp);
            break;

        case FSCTL_SET_BOOTLOADER_ACCESSED:
            WARN("STUB: FSCTL_SET_BOOTLOADER_ACCESSED\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_INVALIDATE_VOLUMES:
            Status = invalidate_volumes(Irp);
            break;

        case FSCTL_QUERY_FAT_BPB:
            WARN("STUB: FSCTL_QUERY_FAT_BPB\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_FILESYSTEM_GET_STATISTICS:
            Status = fs_get_statistics(Irp->AssociatedIrp.SystemBuffer, IrpSp->Parameters.FileSystemControl.OutputBufferLength, &Irp->IoStatus.Information);
            break;

        case FSCTL_GET_NTFS_VOLUME_DATA:
            WARN("STUB: FSCTL_GET_NTFS_VOLUME_DATA\n");
            Status = STATUS_INVALID_DEVICE_REQUEST;
            break;

        case FSCTL_GET_NTFS_FILE_RECORD:
            WARN(