Previously the only fuse-overlayfs supports "--remap-labels" option.
Since idmapped mounts were landed to Linux kernel v5.12 it becomes
possible to use it with overlayfs via mount_setattr() system call.
The changes are based on experimental patchset published by
Mauricio Vásquez #4734.
Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
Signed-off-by: Artem Kuzin <artem.kuzin@huawei.com>
Signed-off-by: Ilya Hanov <ilya.hanov@huawei-partners.com>
Previously remapping of a snapshotter has been done using
recursive chown.
Commit
31a6449734 added a support
for "remap-ids" capability which allows snapshotter internals do
remappings in case of idmapped mounts support to avoid recursive
chown and creating a new remapped snapshot.
Signed-off-by: Ilya Hanov <ilya.hanov@huawei-partners.com>
The Go stdlib does not seem to have an efficient os.File.ReadFrom
routine for other platforms like it does on Linux with
copy_file_range. For Darwin at least we can use clonefile
in its place, otherwise if we have a sparse file we'd have
a fun surprise with the io.Copy approach..
We should see if there's other platforms that we can enhance here.
I've forgotten what's the right route on Windows.
Signed-off-by: Danny Canter <danny@dcantah.dev>
This was the only option not configurable from the toml for the plugin.
This is useful if you want to restart containerd and try a different
blockfile/size for the snapshotter.
Signed-off-by: Danny Canter <danny@dcantah.dev>
"ro" was not parsed out of the string, so it was passed as part of data
to mount().
This would lead to mount() returning an invalid argument code.
Separate out the "ro" option, much like "userxattr", which will allow
the MS-RDONLY mountflag to get set.
Signed-off-by: Ben Foster <bpfoster@gmail.com>
Modify the loopback size in the blockfile snapshotter test setup.
Set the loopback size to 16MB when the page size is greater than 4096.
Signed-off-by: James Jenkins <James.Jenkins@ibm.com>
Helpers to convert from snapshot types to their protobuf structures and
vice-versa appear three times. It seems sane to just expose this facility
in the snapshots pkg. From/ToKind weren't used anywhere but doesn't hurt to
round out the types by exposing them.
Signed-off-by: Danny Canter <danny@dcantah.dev>
Helpers to convert from containerd's [Mount] to its protobuf structure for
[Mount] and vice-versa appear three times. It seems sane to just expose
this facility in /mount.
Signed-off-by: Danny Canter <danny@dcantah.dev>
* Use direct-io mode to reduce IO.
* Add testViewHook helper to recovery the backing file since the ext4
might need writable permission to handle recovery. If the backing file
needs recovery and it's for View snapshot, the readonly mount will
cause error.
* Use 8 MiB as capacity to reduce the IO.
Signed-off-by: Wei Fu <fuweid89@gmail.com>
RunWithPrivileges() will enable privileges will lock a thread, change
privileges, and run the function passed in, within that thread. This
allows us to limit the scope in which we enable privileges and avoids
accidentally enabling privileges in threads that should never have them.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
It seems that in certain situations, like having the containerd root
and state on a file system hosted on a mounted VHDX, we need
SeSecurityPrivilege when opening a file with winio.ACCESS_SYSTEM_SECURITY.
This happens in the base layer writer in hcsshim when adding a new file.
Enabling SeSecurityPrivilege allows the containerd root to be hosted on
a vhdx.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
* Improve error messages
* remove a check for the existance of unmount target. We probably
should not mask that the target was missing.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
As opposed to a writable layer derived from a base layer, the volume
path of a base layer, once activated and prepared will not be a WCIFS
volume, but the actual path on disk to the snapshot. We cannot directly
mount this folder, as that would mean a client may gain access and
potentially damage important metadata files that would render the layer
unusabble.
For base layers we need to mount the Files folder which must exist in
any valid base windows-layer.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
fstest.CheckDirectoryEqual checks if any files in the diff matches a
list of known metadataFiles. This only happens if we specify the initial
layer as the first parameter and the mutated layer as the second.
This also enables the read-only view checks, as the bind filter allows
us to mount a layer as ro.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
The bind filter supports bind-like mounts and volume mounts. It also
allows us to have read-only mounts.
Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
NTFS, when presented with an all-caps filename, assumes you are just
being loud for no reason, and instead stores an all-lower-case filename.
Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>
This is necessary on Windows, as it's not possible to delete a snapshot
while it is still mounted, even if the mount-point has been deleted.
Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>
