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Add Linux namespace delegation support

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This allows ZFS datasets to be delegated to a user/mount namespace
Within that namespace, only the delegated datasets are visible
Works very similarly to Zones/Jailes on other ZFS OSes

As a user:
```
 $ unshare -Um
 $ zfs list
no datasets available
 $ echo $$
1234
```

As root:
```
 # zfs list
NAME                            ZONED  MOUNTPOINT
containers                      off    /containers
containers/host                 off    /containers/host
containers/host/child           off    /containers/host/child
containers/host/child/gchild    off    /containers/host/child/gchild
containers/unpriv               on     /unpriv
containers/unpriv/child         on     /unpriv/child
containers/unpriv/child/gchild  on     /unpriv/child/gchild

 # zfs zone /proc/1234/ns/user containers/unpriv
```

Back to the user namespace:
```
 $ zfs list
NAME                             USED  AVAIL     REFER  MOUNTPOINT
containers                       129M  47.8G       24K  /containers
containers/unpriv                128M  47.8G       24K  /unpriv
containers/unpriv/child          128M  47.8G      128M  /unpriv/child
```

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Will Andrews <will.andrews@klarasystems.com>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Co-authored-by: Allan Jude <allan@klarasystems.com>
Co-authored-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Sponsored-by: Buddy <https://buddy.works>
Closes #12263
This commit is contained in:
Will Andrews
2021-02-21 10:19:43 -06:00
committed by Brian Behlendorf
parent a1aa8f14c8
commit 4ed5e25074
33 changed files with 1166 additions and 15 deletions
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module/os/linux/zfs/zfs_vfsops.c
+20
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@@ -1453,14 +1453,34 @@ zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent)
int error = 0;
zfsvfs_t *zfsvfs = NULL;
vfs_t *vfs = NULL;
int canwrite;
int dataset_visible_zone;
ASSERT(zm);
ASSERT(osname);
dataset_visible_zone = zone_dataset_visible(osname, &canwrite);
/*
* Refuse to mount a filesystem if we are in a namespace and the
* dataset is not visible or writable in that namespace.
*/
if (!INGLOBALZONE(curproc) &&
(!dataset_visible_zone || !canwrite)) {
return (SET_ERROR(EPERM));
}
error = zfsvfs_parse_options(zm->mnt_data, &vfs);
if (error)
return (error);
/*
* If a non-writable filesystem is being mounted without the
* read-only flag, pretend it was set, as done for snapshots.
*/
if (!canwrite)
vfs->vfs_readonly = true;
error = zfsvfs_create(osname, vfs->vfs_readonly, &zfsvfs);
if (error) {
zfsvfs_vfs_free(vfs);