volume: add new option -o o=noquota

add a new option to completely disable xfs quota usage for a volume. xfs quota set on a volume, even just for tracking disk usage, can cause weird errors if the volume is later re-used by a container with a different quota projid. More specifically, link(2) and rename(2) might fail with EXDEV if the source file has a projid that is different from the parent directory. To prevent such kind of issues, the volume should be created beforehand with `podman volume create -o o=noquota $ID` Closes: containers#14049 Signed-off-by: Giuseppe Scrivano <[email protected]>
mheon · May 3, 2022 · e5d6b6b · e5d6b6b
1 parent 77f1474
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diff --git a/docs/source/markdown/podman-volume-create.1.md b/docs/source/markdown/podman-volume-create.1.md
@@ -38,7 +38,8 @@ The `device` option sets the device to be mounted, and is equivalent to the `dev
 The `o` option sets options for the mount, and is equivalent to the `-o` flag to **mount(8)** with these exceptions:
 
   - The `o` option supports `uid` and `gid` options to set the UID and GID of the created volume that are not normally supported by **mount(8)**.
-  - The `o` option supports the `size` option to set the maximum size of the created volume and the `inodes` option to set the maximum number of inodes for the volume. Currently these flags are only supported on "xfs" file system mounted with the `prjquota` flag described in the **xfs_quota(8)** man page.
+  - The `o` option supports the `size` option to set the maximum size of the created volume, the `inodes` option to set the maximum number of inodes for the volume and `noquota` to completely disable quota support even for tracking of disk usage. Currently these flags are only supported on "xfs" file system mounted with the `prjquota` flag described in the **xfs_quota(8)** man page.
+  - The `o` option supports .
   - Using volume options other then the UID/GID options with the **local** driver requires root privileges.
 
 When not using the **local** driver, the given options are passed directly to the volume plugin. In this case, supported options are dictated by the plugin in question, not Podman.

diff --git a/libpod/options.go b/libpod/options.go
@@ -1634,6 +1634,19 @@ func WithVolumeNoChown() VolumeCreateOption {
 	}
 }
 
+// WithVolumeDisableQuota prevents the volume from being assigned a quota.
+func WithVolumeDisableQuota() VolumeCreateOption {
+	return func(volume *Volume) error {
+		if volume.valid {
+			return define.ErrVolumeFinalized
+		}
+
+		volume.config.DisableQuota = true
+
+		return nil
+	}
+}
+
 // withSetAnon sets a bool notifying libpod that this volume is anonymous and
 // should be removed when containers using it are removed and volumes are
 // specified for removal.

diff --git a/libpod/runtime_volume_linux.go b/libpod/runtime_volume_linux.go
@@ -73,7 +73,7 @@ func (r *Runtime) newVolume(options ...VolumeCreateOption) (_ *Volume, deferredE
 						return nil, errors.Wrapf(err, "invalid volume option %s for driver 'local'", key)
 					}
 				}
-			case "o", "type", "uid", "gid", "size", "inodes":
+			case "o", "type", "uid", "gid", "size", "inodes", "noquota":
 				// Do nothing, valid keys
 			default:
 				return nil, errors.Wrapf(define.ErrInvalidArg, "invalid mount option %s for driver 'local'", key)
@@ -111,23 +111,28 @@ func (r *Runtime) newVolume(options ...VolumeCreateOption) (_ *Volume, deferredE
 		if err := LabelVolumePath(fullVolPath); err != nil {
 			return nil, err
 		}
-		projectQuotaSupported := false
-
-		q, err := quota.NewControl(r.config.Engine.VolumePath)
-		if err == nil {
-			projectQuotaSupported = true
-		}
-		quota := quota.Quota{}
-		if volume.config.Size > 0 || volume.config.Inodes > 0 {
-			if !projectQuotaSupported {
-				return nil, errors.New("Volume options size and inodes not supported. Filesystem does not support Project Quota")
+		if volume.config.DisableQuota {
+			if volume.config.Size > 0 || volume.config.Inodes > 0 {
+				return nil, errors.New("volume options size and inodes cannot be used without quota")
 			}
-			quota.Size = volume.config.Size
-			quota.Inodes = volume.config.Inodes
-		}
-		if projectQuotaSupported {
-			if err := q.SetQuota(fullVolPath, quota); err != nil {
-				return nil, errors.Wrapf(err, "failed to set size quota size=%d inodes=%d for volume directory %q", volume.config.Size, volume.config.Inodes, fullVolPath)
+		} else {
+			projectQuotaSupported := false
+			q, err := quota.NewControl(r.config.Engine.VolumePath)
+			if err == nil {
+				projectQuotaSupported = true
+			}
+			quota := quota.Quota{}
+			if volume.config.Size > 0 || volume.config.Inodes > 0 {
+				if !projectQuotaSupported {
+					return nil, errors.New("volume options size and inodes not supported. Filesystem does not support Project Quota")
+				}
+				quota.Size = volume.config.Size
+				quota.Inodes = volume.config.Inodes
+			}
+			if projectQuotaSupported {
+				if err := q.SetQuota(fullVolPath, quota); err != nil {
+					return nil, errors.Wrapf(err, "failed to set size quota size=%d inodes=%d for volume directory %q", volume.config.Size, volume.config.Inodes, fullVolPath)
+				}
 			}
 		}
 

diff --git a/libpod/volume.go b/libpod/volume.go
@@ -52,6 +52,9 @@ type VolumeConfig struct {
 	Size uint64 `json:"size"`
 	// Inodes maximum of the volume.
 	Inodes uint64 `json:"inodes"`
+	// DisableQuota indicates that the volume should completely disable using any
+	// quota tracking.
+	DisableQuota bool `json:"disableQuota,omitempty"`
 }
 
 // VolumeState holds the volume's mutable state.

diff --git a/libpod/volume_internal.go b/libpod/volume_internal.go
@@ -52,6 +52,9 @@ func (v *Volume) needsMount() bool {
 	if _, ok := v.config.Options["SIZE"]; ok {
 		index++
 	}
+	if _, ok := v.config.Options["NOQUOTA"]; ok {
+		index++
+	}
 	// when uid or gid is set there is also the "o" option
 	// set so we have to ignore this one as well
 	if index > 0 {

diff --git a/pkg/domain/infra/abi/parse/parse.go b/pkg/domain/infra/abi/parse/parse.go
@@ -73,6 +73,11 @@ func VolumeOptions(opts map[string]string) ([]libpod.VolumeCreateOption, error)
 					finalVal = append(finalVal, o)
 					// set option "GID": "$gid"
 					volumeOptions["GID"] = splitO[1]
+				case "noquota":
+					logrus.Debugf("Removing noquota from options and adding WithVolumeDisableQuota")
+					libpodOptions = append(libpodOptions, libpod.WithVolumeDisableQuota())
+					// set option "NOQUOTA": "true"
+					volumeOptions["NOQUOTA"] = "true"
 				default:
 					finalVal = append(finalVal, o)
 				}

diff --git a/test/test_podman_baseline.sh b/test/test_podman_baseline.sh
@@ -309,6 +309,28 @@ else
     echo "Overlay test within limits failed"
 fi
 
+before=`xfs_quota -x -c 'report -N -p' $TMPDIR | grep -c ^#`
+podman $PODMANBASE volume create -o o=noquota test-no-quota
+after=`xfs_quota -x -c 'report -N -p' $TMPDIR | grep -c ^#`
+
+if [ $before != $after ];
+then
+    echo "Test -o=noquota doesn't create a projid failed"
+else
+    echo "Test -o=noquota doesn't create a projid passed"
+fi
+
+before=`xfs_quota -x -c 'report -N -p' $TMPDIR | grep -c ^#`
+podman $PODMANBASE volume create -o test-no-quota
+after=`xfs_quota -x -c 'report -N -p' $TMPDIR | grep -c ^#`
+
+if [ $before == $after ];
+then
+    echo "Test without -o=noquota creates a projid failed"
+else
+    echo "Test without -o=noquota creates a projid passed"
+fi
+
 ########
 # Expected to fail
 ########