0e633ee14a
Problem Description:
An example scenario that involves deferred removal
1. A new base image gets created (e.g. 'docker load -i'). The base device is activated and
mounted at some point in time during image creation.
2. While image creation is in progress, a privileged container is started
from another image and the host's mount name space is shared with this
container ('docker run --privileged -v /:/host').
3. Image creation completes and the base device gets unmounted. However,
as the privileged container still holds a reference on the base image
mount point, the base device cannot be removed right away. So it gets
flagged for deferred removal.
4. Next, the privileged container terminates and thus its reference to the
base image mount point gets released. The base device (which is flagged
for deferred removal) may now be cleaned up by the device-mapper. This
opens up an opportunity for a race between a 'kworker' thread (executing
the do_deferred_remove() function) and the Docker daemon (executing the
CreateSnapDevice() function).
This PR cancel the deferred removal, if the device is marked for it. And reschedule the
deferred removal later after the device is resumed successfully.
Signed-off-by: Shishir Mahajan <shishir.mahajan@redhat.com>
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|---|---|---|
| .. | ||
| aaparser | ||
| archive | ||
| authorization | ||
| broadcaster | ||
| chrootarchive | ||
| devicemapper | ||
| directory | ||
| discovery | ||
| filenotify | ||
| fileutils | ||
| gitutils | ||
| graphdb | ||
| homedir | ||
| httputils | ||
| idtools | ||
| integration | ||
| ioutils | ||
| jsonlog | ||
| jsonmessage | ||
| listeners | ||
| locker | ||
| longpath | ||
| loopback | ||
| mflag | ||
| mount | ||
| namesgenerator | ||
| parsers | ||
| pidfile | ||
| platform | ||
| plugins | ||
| pools | ||
| progress | ||
| promise | ||
| pubsub | ||
| random | ||
| reexec | ||
| registrar | ||
| signal | ||
| stdcopy | ||
| streamformatter | ||
| stringid | ||
| stringutils | ||
| symlink | ||
| sysinfo | ||
| system | ||
| tailfile | ||
| tarsum | ||
| term | ||
| testutil | ||
| tlsconfig | ||
| truncindex | ||
| urlutil | ||
| useragent | ||
| README.md | ||
pkg/ is a collection of utility packages used by the Docker project without being specific to its internals.
Utility packages are kept separate from the docker core codebase to keep it as small and concise as possible. If some utilities grow larger and their APIs stabilize, they may be moved to their own repository under the Docker organization, to facilitate re-use by other projects. However that is not the priority.
The directory pkg is named after the same directory in the camlistore project. Since Brad is a core
Go maintainer, we thought it made sense to copy his methods for organizing Go code :) Thanks Brad!
Because utility packages are small and neatly separated from the rest of the codebase, they are a good place to start for aspiring maintainers and contributors. Get in touch if you want to help maintain them!