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From: Klaus Kiwi <kkiwi@redhat.com>
To: Hanna Reitz <hreitz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel <qemu-devel@nongnu.org>,
	Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [qemu-web PATCH] Add a blog post about FUSE block exports
Date: Thu, 19 Aug 2021 15:22:35 -0300	[thread overview]
Message-ID: <CAELHpAD81hgKbvRV=R7jaLyi8Nwi-edd+mJ8arhXAp2=iAiokg@mail.gmail.com> (raw)
In-Reply-To: <20210819102501.69638-1-hreitz@redhat.com>

[-- Attachment #1: Type: text/plain, Size: 229570 bytes --]

On Thu, Aug 19, 2021 at 7:27 AM Hanna Reitz <hreitz@redhat.com> wrote:

> This post explains when FUSE block exports are useful, how they work,
> and that it is fun to export an image file on its own path so it looks
> like your image file (in whatever format it was) is a raw image now.
>
>
Thanks Hanna, great work. Even if you explained this to me multiple times,
thanks to this I think I now finally understand *how* it works.


> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
> ---
> You can also find this patch here:
> https://gitlab.com/hreitz/qemu-web fuse-blkexport-v1
>
> My first patch to qemu-web, so I hope I am not doing anything overly
> stupid here (adding SVGs with extremely long lines comes to mind)...
> ---
>  _posts/2021-08-18-fuse-blkexport.md       | 488 ++++++++++++++++++++++
>  screenshots/2021-08-18-block-graph-a.svg  |   2 +
>  screenshots/2021-08-18-block-graph-b.svg  |   2 +
>  screenshots/2021-08-18-block-graph-c.svg  |   2 +
>  screenshots/2021-08-18-block-graph-d.svg  |   2 +
>  screenshots/2021-08-18-block-graph-e.svg  |   2 +
>  screenshots/2021-08-18-root-directory.svg |   2 +
>  screenshots/2021-08-18-root-file.svg      |   2 +
>  8 files changed, 502 insertions(+)
>  create mode 100644 _posts/2021-08-18-fuse-blkexport.md
>  create mode 100644 screenshots/2021-08-18-block-graph-a.svg
>  create mode 100644 screenshots/2021-08-18-block-graph-b.svg
>  create mode 100644 screenshots/2021-08-18-block-graph-c.svg
>  create mode 100644 screenshots/2021-08-18-block-graph-d.svg
>  create mode 100644 screenshots/2021-08-18-block-graph-e.svg
>  create mode 100644 screenshots/2021-08-18-root-directory.svg
>  create mode 100644 screenshots/2021-08-18-root-file.svg
>
> diff --git a/_posts/2021-08-18-fuse-blkexport.md
> b/_posts/2021-08-18-fuse-blkexport.md
> new file mode 100644
> index 0000000..e6a55d0
> --- /dev/null
> +++ b/_posts/2021-08-18-fuse-blkexport.md
> @@ -0,0 +1,488 @@
> +---
> +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]
>

Non-fatal, but I feel that the title doesn't summarize all that this' blog
posts is about.
An alternate suggestion might be in the lines of "A look into QEMU's FUSE
export
feature, and how to use it to manipulate guest images".



> +---
> +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.
> +
>
Guessing that this would be the best place to mention
guestmount/libguestfs, as Stefan
mentioned in another reply to this thread?

Bonus points if you can identify (dis)advantages, similarly to that you did
below
with the other methods.


> +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.
> +
>

Nitpicking but maybe FUSE here could link to another tutorial/wikipedia page
with more info?


> +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
>
> I must confess that, as I've gone through the document, this felt a bit
like breaking
the flow (probably due to my pre-conceptions of always mounting a resource
into
some directory to see it's content, which I guess was what I was expecting
this
would go before talking about mounting files).

I understand now, however, that this introduction is necessary, but perhaps
something like "Before we are able to use QEMU's FUSE exports, we need to
clarify
some fundamental concepts on the VFS and mountpoints: It is a little-known
fact
that <...>" would help me understand the flow better here.


> +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`).
> +
>

Must confess that I wish there were a better term for it than 'shadowed
directory'
or 'shadowed file', avoiding potential confusion with things like
/etc/shadow or
'shadow memory'.. But I couldn't think if any.


> +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:
>

As much as I hate to say it, wouldn't it be better to give the example
below using
(legacy?) qemu monitor commands, instead of JSON? Unless it cannot be done
that way
of course, they feel more intuitive/recognizable to me I think.

+```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
> new file mode 100644
> index 0000000..bea1ba3
>

The rest of it is very didactic and educational - thanks!  And since none
of my comments are critical:

Reviewed-by: Klaus Heinrich Kiwi <kkiwi@redhat.com>

(Not that it matters much)

 -Klaus


> --- /dev/null
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> --
> 2.31.1
>
>
>

-- 
Klaus Heinrich Kiwi <kkiwi@redhat.com>
Manager, Software Engineering - Red Hat Virtualization

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  parent reply	other threads:[~2021-08-19 18:25 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19 10:25 [qemu-web PATCH] Add a blog post about FUSE block exports Hanna Reitz
2021-08-19 10:37 ` Philippe Mathieu-Daudé
2021-08-19 11:00   ` Hanna Reitz
2021-08-19 11:09     ` Philippe Mathieu-Daudé
2021-08-19 11:17       ` Hanna Reitz
2021-08-19 16:23 ` Stefan Hajnoczi
2021-08-20  7:56   ` Hanna Reitz
2021-08-20  9:21     ` Daniel P. Berrangé
2021-08-20 14:27     ` Stefan Hajnoczi
2021-08-22 13:18     ` Thomas Huth
2021-08-23  8:30       ` Hanna Reitz
2021-08-23  8:49         ` Thomas Huth
2021-08-19 18:22 ` Klaus Kiwi [this message]
2021-08-20  9:03   ` Hanna Reitz
2021-08-20 21:24 ` Eric Blake
2021-08-23  8:23   ` Hanna Reitz

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