Gluster to handle ENOSPC (Error 28) correctly

A gluster volume could yield an ENOSPC condition seeing
that a volume is full.  This needed to handled correctly.
Added error handling.

BUG: 985253

https://bugzilla.redhat.com/show_bug.cgi?id=985253

Change-Id: I85472c0a81a354a2796327fead606da3a938d4bf
Signed-off-by: Chetan Risbud <crisbud@redhat.com>
Reviewed-on: http://review.gluster.org/5362
Reviewed-by: Peter Portante <pportant@redhat.com>
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>

gluster/swift/common/DiskFile.py

@@ -24,7 +24,9 @@ from eventlet import sleep
 from contextlib import contextmanager
 from swift.common.utils import TRUE_VALUES, fallocate
 from swift.common.exceptions import DiskFileNotExist, DiskFileError
-from gluster.swift.common.exceptions import GlusterFileSystemOSError
+
+from gluster.swift.common.exceptions import GlusterFileSystemOSError, \
+    DiskFileNoSpace
 from gluster.swift.common.fs_utils import do_fstat, do_open, do_close, \
     do_unlink, do_chown, os_path, do_fsync, do_fchown, do_stat
 from gluster.swift.common.utils import read_metadata, write_metadata, \
@@ -702,6 +704,11 @@ class Gluster_DiskFile(DiskFile):
                 fd = do_open(tmppath,
                              os.O_WRONLY | os.O_CREAT | os.O_EXCL | O_CLOEXEC)
             except GlusterFileSystemOSError as gerr:
+                if gerr.errno == errno.ENOSPC:
+                    # Raise DiskFileNoSpace to be handled by upper layers
+                    excp = DiskFileNoSpace()
+                    excp.drive = os.path.basename(self.device_path)
+                    raise excp
                 if gerr.errno == errno.EEXIST:
                     # Retry with a different random number.
                     continue

gluster/swift/common/exceptions.py

@@ -44,3 +44,7 @@ class AlreadyExistsAsDir(GlusterfsException):
 
 class AlreadyExistsAsFile(GlusterfsException):
     pass
+
+
+class DiskFileNoSpace(GlusterfsException):
+    pass

gluster/swift/obj/server.py

@@ -17,11 +17,13 @@
 
 # Simply importing this monkey patches the constraint handling to fit our
 # needs
-import gluster.swift.common.constraints    # noqa
-import gluster.swift.common.utils          # noqa
-
 from swift.obj import server
+import gluster.swift.common.utils          # noqa
+import gluster.swift.common.constraints    # noqa
+from swift.common.utils import public, timing_stats
 from gluster.swift.common.DiskFile import Gluster_DiskFile
+from gluster.swift.common.exceptions import DiskFileNoSpace
+from swift.common.swob import HTTPInsufficientStorage
 
 # Monkey patch the object server module to use Gluster's DiskFile definition
 server.DiskFile = Gluster_DiskFile
@@ -54,6 +56,15 @@ class ObjectController(server.ObjectController):
         """
         return
 
+    @public
+    @timing_stats()
+    def PUT(self, request):
+        try:
+            return server.ObjectController.PUT(self, request)
+        except DiskFileNoSpace as err:
+            drive = err.drive
+            return HTTPInsufficientStorage(drive=drive, request=request)
+
 
 def app_factory(global_conf, **local_conf):
     """paste.deploy app factory for creating WSGI object server apps"""

test/unit/common/test_diskfile.py

@@ -21,18 +21,21 @@ import errno
 import unittest
 import tempfile
 import shutil
+import mock
 from mock import patch
 from hashlib import md5
-from swift.common.utils import normalize_timestamp
-from swift.common.exceptions import DiskFileNotExist, DiskFileError
-import gluster.swift.common.DiskFile
+
 import gluster.swift.common.utils
+import gluster.swift.common.DiskFile
+from swift.common.utils import normalize_timestamp
 from gluster.swift.common.DiskFile import Gluster_DiskFile
+from swift.common.exceptions import DiskFileNotExist, DiskFileError
 from gluster.swift.common.utils import DEFAULT_UID, DEFAULT_GID, X_TYPE, \
     X_OBJECT_TYPE, DIR_OBJECT
 from test_utils import _initxattr, _destroyxattr
 from test.unit import FakeLogger
 
+from gluster.swift.common.exceptions import *
 
 _metadata = {}
 
@@ -569,6 +572,45 @@ class TestDiskFile(unittest.TestCase):
         finally:
             shutil.rmtree(td)
 
+
+    def test_put_ENOSPC(self):
+        td = tempfile.mkdtemp()
+        the_cont = os.path.join(td, "vol0", "bar")
+        try:
+            os.makedirs(the_cont)
+            gdf = Gluster_DiskFile(td, "vol0", "p57", "ufo47", "bar",
+                                   "z", self.lg)
+            assert gdf._obj == "z"
+            assert gdf._obj_path == ""
+            assert gdf.name == "bar"
+            assert gdf.datadir == the_cont
+            assert gdf.data_file is None
+
+            body = '1234\n'
+            etag = md5()
+            etag.update(body)
+            etag = etag.hexdigest()
+            metadata = {
+                'X-Timestamp': '1234',
+                'Content-Type': 'file',
+                'ETag': etag,
+                'Content-Length': '5',
+                }
+            def mock_open(*args, **kwargs):
+                raise OSError(errno.ENOSPC, os.strerror(errno.ENOSPC))
+
+            with mock.patch("os.open", mock_open):
+                try:
+                    with gdf.mkstemp() as fd:
+                        assert gdf.tmppath is not None
+                        tmppath = gdf.tmppath
+                        os.write(fd, body)
+                        gdf.put(fd, metadata)
+                except DiskFileNoSpace:
+                    pass
+        finally:
+            shutil.rmtree(td)
+
     def test_put_obj_path(self):
         the_obj_path = os.path.join("b", "a")
         the_file = os.path.join(the_obj_path, "z")