Move the "unmount and deactivate" code into a separate method, and
optimize it a bit:
1. Do not use filepath.Walk() as there's no requirement to recursively
go into every directory under home/mnt; a list of directories in mnt
is sufficient. With filepath.Walk(), in case some container will fail
to unmount, it'll go through the whole container filesystem which is
excessive and useless.
2. Do not use GetMounts() and check if a directory is mounted; just
unmount it and ignore "not mounted" error. Note the same error
is returned in case of wrong flags set, but as flags are hardcoded
we can safely ignore such case.
While at it, promote "can't unmount" log level from debug to warning.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: f1a459229724f5e8e440b49f058167c2eeeb2dc6
Component: engine
1. Make sure it's clear the error is from unmount.
2. Simplify the code a bit to make it more readable.
[v2: use errors.Wrap]
[v3: use errors.Wrapf]
[v4: lowercase the error message]
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 9d00aedebc25507042c5afd4ab8fc6b333ca7c53
Component: engine
1. Replace EnsureRemoveAll() with Rmdir(), as here we are removing
the container's mount point, which is already properly unmounted
and is therefore an empty directory.
2. Ignore the Rmdir() error (but log it unless it's ENOENT). This
is a mount point, currently unmounted (i.e. an empty directory),
and an older kernel can return EBUSY if e.g. the mount was
leaked to other mount namespaces.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 732dd9b848bec70a2ecb5b4998918886a0cec497
Component: engine
It looks like no one uses this function.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 0450f61cb995c8fc2f41a6909526be6ed4093565
Component: engine
Before this change, volume management was relying on the fact that
everything the plugin mounts is visible on the host within the plugin's
rootfs. In practice this caused some issues with mount leaks, so we
changed the behavior such that mounts are not visible on the plugin's
rootfs, but available outside of it, which breaks volume management.
To fix the issue, allow the plugin to scope the path correctly rather
than assuming that everything is visible in `p.Rootfs`.
In practice this is just scoping the `PropagatedMount` paths to the
correct host path.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 0e5eaf8ee32662182147f5f62c1bfebef66f5c47
Component: engine
Setting up the mounts on the host increases chances of mount leakage and
makes for more cleanup after the plugin has stopped.
With this change all mounts for the plugin are performed by the
container runtime and automatically cleaned up when the container exits.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: a53930a04fa81b082aa78e66b342ff19cc63cc5f
Component: engine
This was added in #36047 just as a way to make sure the tree is fully
unmounted on shutdown.
For ZFS this could be a breaking change since there was no unmount before.
Someone could have setup the zfs tree themselves. It would be better, if
we really do want the cleanup to actually the unpacked layers checking
for mounts rather than a blind recursive unmount of the root.
BTRFS does not use mounts and does not need to unmount anyway.
These was only an unmount to begin with because for some reason the
btrfs tree was being moutned with `private` propagation.
For the other graphdrivers that still have a recursive unmount here...
these were already being unmounted and performing the recursive unmount
shouldn't break anything. If anyone had anything mounted at the
graphdriver location it would have been unmounted on shutdown anyway.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 2fe4f888bee52b1f256d6fa5e20f9b061d30221c
Component: engine
The idea behind making the graphdrivers private is to prevent leaking
mounts into other namespaces.
Unfortunately this is not really what happens.
There is one case where this does work, and that is when the namespace
was created before the daemon's namespace.
However with systemd each system servie winds up with it's own mount
namespace. This causes a race betwen daemon startup and other system
services as to if the mount is actually private.
This also means there is a negative impact when other system services
are started while the daemon is running.
Basically there are too many things that the daemon does not have
control over (nor should it) to be able to protect against these kinds
of leakages. One thing is certain, setting the graphdriver roots to
private disconnects the mount ns heirarchy preventing propagation of
unmounts... new mounts are of course not propagated either, but the
behavior is racey (or just bad in the case of restarting services)... so
it's better to just be able to keep mount propagation in tact.
It also does not protect situations like `-v
/var/lib/docker:/var/lib/docker` where all mounts are recursively bound
into the container anyway.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 9803272f2db84df7955b16c0d847ad72cdc494d1
Component: engine
This is a fix to regression in vfs graph driver introduced by
commit 7a1618ced359a3ac92 ("add quota support to VFS graphdriver").
On some filesystems, vfs fails to init with the following error:
> Error starting daemon: error initializing graphdriver: Failed to mknod
> /go/src/github.com/docker/docker/bundles/test-integration/d6bcf6de610e9/root/vfs/backingFsBlockDev:
> function not implemented
As quota is not essential for vfs, let's ignore (but log as a warning) any error
from quota init.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 1e8a087850aa9f96c5000a3ad90757d2e9c0499f
Component: engine
If mknod() returns ENOSYS, it most probably means quota is not supported
here, so return the appropriate error.
This is a conservative* fix to regression in vfs graph driver introduced
by commit 7a1618ced359a3ac92 ("add quota support to VFS graphdriver").
On some filesystems, vfs fails to init with the following error:
> Error starting daemon: error initializing graphdriver: Failed to mknod
> /go/src/github.com/docker/docker/bundles/test-integration/d6bcf6de610e9/root/vfs/backingFsBlockDev:
> function not implemented
Reported-by: Brian Goff <cpuguy83@gmail.com>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 2dd39b7841bdb9968884bbedc5db97ff77d4fe3e
Component: engine
Files that are suffixed with `_linux.go` or `_windows.go` are
already only built on Linux / Windows, so these build-tags
were redundant.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 6ed1163c98703f8dd0693cecbadc84d2cda811c3
Component: engine
The overlay2 driver was not setting up the archive.TarOptions field
properly like other storage backend routes to "applyTarLayer"
functionality. The InUserNS field is populated now for overlay2 using
the same query function used by the other storage drivers.
Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
Upstream-commit: 05b8d59015f8a5ce26c8bbaa8053b5bc7cb1a77b
Component: engine
Right now we only log source and destination (and demsg) if mount operation
fails. fstype and mount options are available easily. It probably is a good
idea to log these as well. Especially sometimes failures can happen due to
mount options.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Upstream-commit: f728d74ac5d185adaa5f1a88eadc71217806859f
Component: engine
Even though it's highly discouraged, there are existing
installs that are running overlay/overlay2 on filesystems
without d_type support.
This patch allows the daemon to start in such cases, instead of
refusing to start without an option to override.
For fresh installs, backing filesystems without d_type support
will still cause the overlay/overlay2 drivers to be marked as
"unsupported", and skipped during the automatic selection.
This feature is only to keep backward compatibility, but
will be removed at some point.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 0a4e793a3da9ba6d20bccfb83f7c48e20a76d895
Component: engine
Support for running overlay/overlay2 on a backing filesystem
without d_type support (most likely: xfs, as ext4 supports
this by default), was deprecated for some time.
Running without d_type support is problematic, and can
lead to difficult to debug issues ("invalid argument" errors,
or unable to remove files from the container's filesystem).
This patch turns the warning that was previously printed
into an "unsupported" error, so that the overlay/overlay2
drivers are not automatically selected when detecting supported
storage drivers.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 0abb8dec3f730f3ad2cc9a161c97968a6bfd0631
Component: engine
The fsmagic check was always performed on "data-root" (`/var/lib/docker`),
not on the storage-driver's home directory (e.g. `/var/lib/docker/<somedriver>`).
This caused detection to be done on the wrong filesystem in situations
where `/var/lib/docker/<somedriver>` was a mount, and a different
filesystem than `/var/lib/docker` itself.
This patch checks if the storage-driver's home directory exists, and only
falls back to `/var/lib/docker` if it doesn't exist.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: f9c8fa305e1501d8056f8744cb193a720aab0e13
Component: engine
This commit is a set of fixes and improvement for zfs graph driver,
in particular:
1. Remove mount point after umount in `Get()` error path, as well
as in `Put()` (with `MNT_DETACH` flag). This should solve "failed
to remove root filesystem for <ID> .... dataset is busy" error
reported in Moby issue 35642.
To reproduce the issue:
- start dockerd with zfs
- docker run -d --name c1 --rm busybox top
- docker run -d --name c2 --rm busybox top
- docker stop c1
- docker rm c1
Output when the bug is present:
```
Error response from daemon: driver "zfs" failed to remove root
filesystem for XXX : exit status 1: "/sbin/zfs zfs destroy -r
scratch/docker/YYY" => cannot destroy 'scratch/docker/YYY':
dataset is busy
```
Output when the bug is fixed:
```
Error: No such container: c1
```
(as the container has been successfully autoremoved on stop)
2. Fix/improve error handling in `Get()` -- do not try to umount
if `refcount` > 0
3. Simplifies unmount in `Get()`. Specifically, remove call to
`graphdriver.Mounted()` (which checks if fs is mounted using
`statfs()` and check for fs type) and `mount.Unmount()` (which
parses `/proc/self/mountinfo`). Calling `unix.Unmount()` is
simple and sufficient.
4. Add unmounting of driver's home to `Cleanup()`.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: a450a575a672b90f02a4b1d3d9300ce1d70a6311
Component: engine
Previously, the code would set the mtime on the directories before
creating files in the directory itself. This was problematic
because it resulted in the mtimes on the directories being
incorrectly set. This change makes it so that the mtime is
set only _after_ all of the files have been created.
Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Upstream-commit: 77a2bc3e5bbc9be3fe166ed8321b7cd04e7bd097
Component: engine
