diff --git a/_posts/2021-08-18-fuse-blkexport.md b/_posts/2021-08-18-fuse-blkexport.md
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+---
+layout: post
+title:  "Exporting block devices as raw image files with FUSE"
+date:   2021-08-18 18:00:00 +0200
+author: Hanna Reitz
+categories: [storage, features, tutorials]
+---
+Sometimes, there is a VM disk image whose contents you want to manipulate
+without booting the VM.  For raw images, that process is usually fairly simple,
+because most Linux systems bring tools for the job, e.g.:
+* *dd* to just copy data to and from given offsets,
+* *parted* to manipulate the partition table,
+* *kpartx* to present all partitions as block devices,
+* *mount* to access filesystems’ contents.
+
+Sadly, but naturally, such tools only work for raw images, and not for images
+e.g. in QEMU’s qcow2 format.  To access such an image’s content, the format has
+to be translated to create a raw image, for example by:
+* Exporting the image file with `qemu-nbd -c` as an NBD block device file,
+* Converting between image formats using `qemu-img convert`,
+* Accessing the image from a guest, where it appears as a normal block device.
+
+Unfortunately, none of these methods is perfect: `qemu-nbd -c` generally
+requires root rights, converting to a temporary raw copy requires additional
+disk space and the conversion process takes time, and accessing the image from a
+guest is just quite cumbersome in general (and also specifically something that
+we set out to avoid in the first sentence of this blog post).
+
+As of QEMU 6.0, there is another method, namely FUSE block exports.
+Conceptually, these are rather similar to using `qemu-nbd -c`, but they do not
+require root rights.
+
+**Note**: FUSE block exports are a feature that can be enabled or disabled
+during the build process with `--enable-fuse` or `--disable-fuse`, respectively;
+omitting either configure option will enable the feature if and only if libfuse3
+is present.  It is possible that the QEMU build you are using does not have FUSE
+block export support, because it was not compiled in.
+
+FUSE (*Filesystem in Userspace*) is a technology to let userspace processes
+provide filesystem drivers.  For example, *sshfs* is a program that allows
+mounting remote directories from a machine accessible via SSH.
+
+QEMU can use FUSE to make a virtual block device appear as a normal file on the
+host, so that tools like *kpartx* can interact with it regardless of the image
+format.
+
+## Background information
+
+### File mounts
+
+A perhaps little-known fact is that, on Linux, filesystems do not need to have
+a root directory, they only need to have a root node.  A filesystem that only
+provides a single regular file is perfectly valid.
+
+Conceptually, every filesystem is a tree, and mounting works by replacing one
+subtree of the global VFS tree by the mounted filesystem’s tree.  Normally, a
+filesystem’s root node is a directory, like in the following example:
+
+|![Regular filesystem: Root directory is mounted to a directory mount point](/screenshots/2021-08-18-root-directory.svg)|
+|:--:|
+|*Fig. 1: Mounting a regular filesystem with a directory as its root node*|
+
+Here, the directory `/foo` and its content (the files `/foo/a` and `/foo/b`) are
+shadowed by the new filesystem (showing `/foo/x` and `/foo/y`).
+
+Note that a filesystem’s root node generally has no name.  After mounting, the
+filesystem’s root directory’s name is determined by the original name of the
+mount point.
+
+Because a tree does not need to have multiple nodes but may consist of just a
+single leaf, a filesystem with a file for its root node works just as well,
+though:
+
+|![Mounting a file root node to a regular file mount point](/screenshots/2021-08-18-root-file.svg)|
+|:--:|
+|*Fig. 2: Mounting a filesystem with a regular (unnamed) file as its root node*|
+
+Here, FS B only consists of a single node, a regular file with no name.  (As
+above, a filesystem’s root node is generally unnamed.) Consequently, the mount
+point for it must also be a regular file (`/foo/a` in our example), and just
+like before, the content of `/foo/a` is shadowed, and when opening it, one will
+instead see the contents of FS B’s unnamed root node.
+
+### QEMU block exports
+
+QEMU allows exporting block nodes via various protocols (as of 6.0: NBD,
+vhost-user, FUSE).  A block node is an element of QEMU’s block graph (see e.g.
+[Managing the New Block Layer](http://events17.linuxfoundation.org/sites/events/files/slides/talk\_11.pdf),
+a talk given at KVM Forum 2017), which can for example be attached to guest
+devices.  Here is a very simple example:
+
+|![Block graph: image file <-> file node (label: prot-node) <-> qcow2 node (label: fmt-node) <-> virtio-blk guest device](/screenshots/2021-08-18-block-graph-a.svg)|
+|:--:|
+|*Fig. 3: A simple block graph for attaching a qcow2 image to a virtio-blk guest device*|
+
+This is the simplest example for a block graph that connects a *virtio-blk*
+guest device to a qcow2 image file.  The *file* block driver, instanced in the
+form of a block node named *prot-node*, accesses the actual file and provides
+the node above it access to the raw content.  This node above, named *fmt-node*,
+is handled by the *qcow2* block driver, which is capable of interpreting the
+qcow2 format.  Parents of this node will therefore see the actual content of the
+virtual disk that is represented by the qcow2 image.  There is only one parent
+here, which is the *virtio-blk* guest device, which will thus see the virtual
+disk.
+
+The command line to achieve the above could look something like this:
+```
+$ qemu-system-x86_64 \
+    -blockdev node-name=prot-node,driver=file,filename=$image_path \
+    -blockdev node-name=fmt-node,driver=qcow2,file=prot-node \
+    -device virtio-blk,drive=fmt-node
+```
+
+Besides attaching guest devices to block nodes, you can also export them for
+users outside of qemu, for example via NBD.  Say you have a QMP channel open for
+the QEMU instance above, then you could do this:
+```json
+{
+    "execute": "nbd-server-start",
+    "arguments": {
+        "addr": {
+            "type": "inet",
+            "data": {
+                "host": "localhost",
+                "port": "10809"
+            }
+        }
+    }
+}
+{
+    "execute": "block-export-add",
+    "arguments": {
+        "type": "nbd",
+        "id": "fmt-node-export",
+        "node-name": "fmt-node",
+        "name": "guest-disk"
+    }
+}
+```
+
+This opens an NBD server on `localhost:10809`, which exports *fmt-node* (under
+the NBD export name *guest-disk*).  The block graph looks as follows:
+
+|![Same block graph as fig. 3, but with an NBD server attached to fmt-node](/screenshots/2021-08-18-block-graph-b.svg)|
+|:--:|
+|*Fig. 4: Block graph extended by an NBD server*|
+
+NBD clients connecting to this server will see the raw disk as seen by the
+guest – we have *exported* the guest disk:
+
+```
+$ qemu-img info nbd://localhost/guest-disk
+image: nbd://localhost:10809/guest-disk
+file format: raw
+virtual size: 20 GiB (21474836480 bytes)
+disk size: unavailable
+```
+
+### QEMU storage daemon
+
+If you are not running a guest, and so do not need guest devices, but all you
+want is to use the QEMU block layer (for example to interpret the qcow2 format)
+and export nodes from the block graph, then you can use the more lightweight
+QEMU storage daemon instead of a full-blown QEMU process:
+
+```
+$ qemu-storage-daemon \
+    --blockdev node-name=prot-node,driver=file,filename=$image_path \
+    --blockdev node-name=fmt-node,driver=qcow2,file=prot-node \
+    --nbd-server addr.type=inet,addr.host=localhost,addr.port=10809 \
+    --export type=nbd,id=fmt-node-export,node-name=fmt-node,name=guest-disk
+```
+
+Which creates the following block graph:
+
+|![Block graph: image file <-> file node (label: prot-node) <-> qcow2 node (label: fmt-node) <-> NBD server](/screenshots/2021-08-18-block-graph-c.svg)|
+|:--:|
+|*Fig. 5: Exporting a qcow2 image over NBD*|
+
+## FUSE block exports
+
+Besides NBD exports, QEMU also supports vhost-user and FUSE exports.  FUSE block
+exports make QEMU become a FUSE driver that provides a filesystem that consists
+of only a single node, namely a regular file that has the raw contents of the
+exported block node.  QEMU will automatically mount this filesystem on a given
+existing regular file (which acts as the mount point, as described in the
+“File mounts” section).
+
+Thus, FUSE exports can be used like this:
+
+```
+$ touch mount-point
+
+$ qemu-storage-daemon \
+    --blockdev node-name=prot-node,driver=file,filename=$image_path \
+    --blockdev node-name=fmt-node,driver=qcow2,file=prot-node \
+    --export type=fuse,id=fmt-node-export,node-name=fmt-node,mountpoint=mount-point
+```
+
+The mount point now appears as the raw VM disk that is stored in the qcow2
+image:
+```
+$ qemu-img info mount-point
+image: mount-point
+file format: raw
+virtual size: 20 GiB (21474836480 bytes)
+disk size: 196 KiB
+```
+
+And *mount* tells us that this is indeed its own filesystem:
+```
+$ mount | grep mount-point
+/dev/fuse on /tmp/mount-point type fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=100,default_permissions,allow_other,max_read=67108864)
+```
+
+The block graph looks like this:
+
+|![Block graph: image file <-> file node (label: prot-node) <-> qcow2 node (label: fmt-node) <-> FUSE server <-> exported file](/screenshots/2021-08-18-block-graph-d.svg)|
+|:--:|
+|*Fig. 6: Exporting a qcow2 image over FUSE*|
+
+Closing the storage daemon (e.g. with Ctrl-C) automatically unmounts the export,
+turning the mount point back into an empty normal file:
+
+```
+$ mount | grep -c mount-point
+0
+
+$ qemu-img info mount-point
+image: mount-point
+file format: raw
+virtual size: 0 B (0 bytes)
+disk size: 0 B
+```
+
+## Mounting an image on itself
+
+So far, we have seen what FUSE exports are, how they work, and how they can be
+used.  Now let’s add an interesting twist.
+
+### What happens to the old tree under a mount point?
+
+Mounting a filesystem only shadows the mount point’s original content, it does
+not remove it.  The original content can no longer be looked up via its
+(absolute) path, but it is still there, much like a file that has been unlinked
+but is still open in some process.  Here is an example:
+
+First, create some file in some directory, and have some process keep it open:
+
+```
+$ mkdir foo
+
+$ echo 'Is anyone there?' > foo/bar
+
+$ irb
+irb(main):001:0> f = File.open('foo/bar', 'r+')
+=> #<File:foo/bar>
+irb(main):002:0> ^Z
+[1]  + 35494 suspended  irb
+```
+
+Next, mount something on the directory:
+
+```
+$ sudo mount -t tmpfs tmpfs foo
+```
+
+The file cannot be found anymore (because *foo*’s content is shadowed by the
+mounted filesystem), but the process who kept it open can still read from it,
+and write to it:
+```
+$ ls foo
+
+$ cat foo/bar
+cat: foo/bar: No such file or directory
+
+$ fg
+f.read
+irb(main):002:0> f.read
+=> "Is anyone there?\n"
+irb(main):003:0> f.puts('Hello from the shadows!')
+=> nil
+irb(main):004:0> exit
+
+$ ls foo
+
+$ cat foo/bar
+cat: foo/bar: No such file or directory
+```
+
+Unmounting the filesystem lets us see our file again, with its updated content:
+```
+$ sudo umount foo
+
+$ ls foo
+bar
+
+$ cat foo/bar
+Is anyone there?
+Hello from the shadows!
+```
+
+### Letting a FUSE export shadow its image file
+
+The same principle applies to file mounts: The original inode is shadowed (along
+with its content), but it is still there for any process that opened it before
+the mount occurred.  Because QEMU (or the storage daemon) opens the image file
+before mounting the FUSE export, you can therefore specify an image’s path as
+the mount point for its corresponding export:
+
+```
+$ qemu-img create -f qcow2 foo.qcow2 20G
+Formatting 'foo.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=21474836480 lazy_refcounts=off refcount_bits=16
+
+$ qemu-img info foo.qcow2
+image: foo.qcow2
+file format: qcow2
+virtual size: 20 GiB (21474836480 bytes)
+disk size: 196 KiB
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    compression type: zlib
+    lazy refcounts: false
+    refcount bits: 16
+    corrupt: false
+    extended l2: false
+
+$ qemu-storage-daemon \
+    --blockdev node-name=node0,driver=qcow2,file.driver=file,file.filename=foo.qcow2 \
+    --export type=fuse,id=node0-export,node-name=node0,mountpoint=foo.qcow2 &
+[1] 40843
+
+$ qemu-img info foo.qcow2
+image: foo.qcow2
+file format: raw
+virtual size: 20 GiB (21474836480 bytes)
+disk size: 196 KiB
+
+$ kill %1
+[1]  + 40843 done       qemu-storage-daemon --blockdev  --export
+```
+
+In graph form, that looks like this:
+
+|![Two graphs: First, foo.qcow2 is opened by QEMU; second, a FUSE server exports the raw disk under foo.qcow2, thus shadowing the original foo.qcow2](/screenshots/2021-08-18-block-graph-e.svg)|
+|:--:|
+|*Fig. 6: Exporting a qcow2 image via FUSE on its own path*|
+
+QEMU (or the storage daemon in this case) keeps the original (qcow2) file open,
+and so it keeps access to it, even after the mount.  However, any other process
+that opens the image by name (i.e. `open("foo.qcow2")`) will open the raw disk
+image exported by QEMU.  Therefore, it looks like the qcow2 image is in raw
+format now.
+
+### `qemu-fuse-disk-export.py`
+
+Because the QEMU storage daemon command line tends to become kind of long, I’ve
+written a script to facilitate the process:
+[qemu-fuse-disk-export.py](https://gitlab.com/hreitz/qemu-scripts/-/blob/main/qemu-fuse-disk-export.py)
+([direct download link](https://gitlab.com/hreitz/qemu-scripts/-/raw/main/qemu-fuse-disk-export.py?inline=false)).
+This script automatically detects the image format, and its `--daemonize` option
+allows safe use in scripts, where it is important that the process blocks until
+the export is fully set up.
+
+Using `qemu-fuse-disk-export.py`, the above example looks like this:
+```
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: qcow2
+
+$ qemu-fuse-disk-export.py foo.qcow2 &
+[1] 13339
+All exports set up, ^C to revert
+
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: raw
+
+$ kill -SIGINT %1
+[1]  + 13339 done       qemu-fuse-disk-export.py foo.qcow2
+
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: qcow2
+```
+
+Or, with `--daemonize`/`-d`:
+```
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: qcow2
+
+$ qemu-fuse-disk-export.py -dp qfde.pid foo.qcow2
+
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: raw
+
+$ kill -SIGINT $(cat qfde.pid)
+
+$ qemu-img info foo.qcow2 | grep 'file format'
+file format: qcow2
+```
+
+## Bringing it all together
+
+Now we know how to make disk images in any format understood by QEMU appear as
+raw images.  We can thus run any application on them that works with such raw
+disk images:
+
+```
+$ qemu-fuse-disk-export.py \
+    -dp qfde.pid \
+    Arch-Linux-x86_64-basic-20210711.28787.qcow2
+
+$ parted Arch-Linux-x86_64-basic-20210711.28787.qcow2 p
+WARNING: You are not superuser.  Watch out for permissions.
+Model:  (file)
+Disk /tmp/Arch-Linux-x86_64-basic-20210711.28787.qcow2: 42.9GB
+Sector size (logical/physical): 512B/512B
+Partition Table: gpt
+Disk Flags:
+
+Number  Start   End     Size    File system  Name  Flags
+ 1      1049kB  2097kB  1049kB                     bios_grub
+ 2      2097kB  42.9GB  42.9GB  btrfs
+
+$ sudo kpartx -av Arch-Linux-x86_64-basic-20210711.28787.qcow2
+add map loop0p1 (254:0): 0 2048 linear 7:0 2048
+add map loop0p2 (254:1): 0 83881951 linear 7:0 4096
+
+$ sudo mount /dev/mapper/loop0p2 /mnt/tmp
+
+$ ls /mnt/tmp
+bin   boot  dev  etc  home  lib  lib64  mnt  opt  proc  root  run  sbin  srv
+swap  sys   tmp  usr  var
+
+$ echo 'Hello, qcow2 image!' > /mnt/tmp/home/arch/hello
+
+$ sudo umount /mnt/tmp
+
+$ sudo kpartx -d Arch-Linux-x86_64-basic-20210711.28787.qcow2
+loop deleted : /dev/loop0
+
+$ kill -SIGINT $(cat qfde.pid)
+```
+
+And launching the image, in the guest we see:
+```
+[arch@archlinux ~] cat hello
+Hello, qcow2 image!
+```
+
+## A note on `allow_other`
+
+In the example presented in the above section, we access the exported image with
+a different user than the one who exported it (to be specific, we export it as a
+normal user, and then access it as root).  This does not work prior to QEMU 6.1:
+
+```
+$ qemu-fuse-disk-export.py -dp qfde.pid foo.qcow2
+
+$ sudo stat foo.qcow2
+stat: cannot statx 'foo.qcow2': Permission denied
+```
+
+QEMU 6.1 has introduced support for FUSE’s `allow_other` mount option.  Without
+that option, only the user who exported the image has access to it.  By default,
+if the system allows for non-root users to add `allow_other` to FUSE mount
+options, QEMU will add it, and otherwise omit it.  It does so by simply
+attempting to mount the export with `allow_other` first, and if that fails, it
+will try again without.  (You can also force the behavior with the
+`allow_other=(on|off|auto)` export parameter.)
+
+Non-root users can pass `allow_other` if and only if `/etc/fuse.conf` contains
+the `user_allow_other` option.
+
+## Conclusion
+
+As shown in this blog post, FUSE block exports are a relatively simple way to
+access images in any format understood by QEMU as if they were raw images.
+Any tool that can manipulate raw disk images can thus manipulate images in any
+format, simply by having the QEMU storage daemon provide a translation layer.
+By mounting the FUSE export on the original image path, this translation layer
+will effectively be invisible, and the original image will look like it is in
+raw format, so it can directly be accessed by those tools.
+
+The current main disadvantage of FUSE exports is that they offer relatively bad
+performance.  That should be fine as long as your use case is just light
+manipulation of some VM images, like manually modifying some files on them.
+However, we did not yet really try to optimize performance, so if more serious
+use cases appear that would require better performance, we can try.
diff --git a/screenshots/2021-08-18-block-graph-a.svg b/screenshots/2021-08-18-block-graph-a.svg
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new file mode 100644
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