[PATCH] block.py: Changes to support thin provisioning.
by Tony Asleson
Users can now use the syntax of vg/lv where the lv refers to a thinly
provisioned pool which can be used to create logical volumes from.
Otherwise the functionality will remain as it previously was.
Copies will utilize thinp snapshots for thinp pools, resulting in very
quick replication and space savings.
Signed-off-by: Tony Asleson <tasleson(a)redhat.com>
---
targetd/block.py | 110 ++++++++++++++++++++++++++++++++++---------------------
1 file changed, 68 insertions(+), 42 deletions(-)
diff --git a/targetd/block.py b/targetd/block.py
index 5b976c8..ca2959e 100644
--- a/targetd/block.py
+++ b/targetd/block.py
@@ -26,13 +26,24 @@ from main import TargetdError
from utils import ignored
+def get_vg_lv(pool_name):
+ """
+ Checks for the existence of a '/' in the pool name. We are using this
+ as an indicator that the vg & lv refer to a thin pool.
+ """
+ if '/' in pool_name:
+ return pool_name.split('/')
+ else:
+ return pool_name, None
+
+
def pool_check(pool_name):
"""
pool_name *cannot* be trusted, funcs taking a pool param must call
this or vgopen() to ensure passed-in pool name is one targetd has
been configured to use.
"""
- if pool_name not in pools:
+ if pool_name not in [get_vg_lv(x)[0] for x in pools]:
raise TargetdError(-110, "Invalid pool")
@@ -62,7 +73,7 @@ def initialize(config_dict):
# fail early if can't access any vg
for pool in pools:
- test_vg = lvm.vgOpen(pool)
+ test_vg = lvm.vgOpen(get_vg_lv(pool)[0])
test_vg.close()
return dict(
@@ -79,16 +90,22 @@ def initialize(config_dict):
def volumes(req, pool):
output = []
- with vgopen(pool) as vg:
+ vg_name, lv_pool = get_vg_lv(pool)
+ with vgopen(vg_name) as vg:
for lv in vg.listLVs():
- output.append(dict(name=lv.getName(), size=lv.getSize(),
- uuid=lv.getUuid()))
+ if lv.getName() != lv_pool:
+ output.append(dict(name=lv.getName(), size=lv.getSize(),
+ uuid=lv.getUuid()))
return output
def create(req, pool, name, size):
- with vgopen(pool) as vg:
- vg.createLvLinear(name, int(size))
+ vg_name, lv_pool = get_vg_lv(pool)
+ with vgopen(vg_name) as vg:
+ if lv_pool:
+ vg.createLvThin(lv_pool, name, int(size))
+ else:
+ vg.createLvLinear(name, int(size))
def destroy(req, pool, name):
@@ -102,7 +119,7 @@ def destroy(req, pool, name):
raise TargetdError(-303, "Volume '%s' cannot be "
"removed while exported" % name)
- with vgopen(pool) as vg:
+ with vgopen(get_vg_lv(pool)[0]) as vg:
vg.lvFromName(name).remove()
@@ -112,36 +129,45 @@ def copy(req, pool, vol_orig, vol_new, timeout=10):
If this operation takes longer than the timeout, it will return
an async completion and report actual status later.
"""
- with vgopen(pool) as vg:
- copy_size = vg.lvFromName(vol_orig).getSize()
-
- create(req, pool, vol_new, copy_size)
-
- copied = 0 # Used in except, make sure exists before we catch exception
-
- try:
- src_path = "/dev/%s/%s" % (pool, vol_orig)
- dst_path = "/dev/%s/%s" % (pool, vol_new)
-
- start_time = time.clock()
- with open(src_path, 'rb') as fsrc:
- with open(dst_path, 'wb') as fdst:
- while copied != copy_size:
- buf = fsrc.read(1024 * 1024)
- if not buf:
- break
- fdst.write(buf)
- copied += len(buf)
- if time.clock() > (start_time + timeout):
- req.mark_async()
- req.async_status(0,
- int((float(copied) / copy_size) * 100))
- req.complete_maybe_async(0)
-
- except Exception, e:
- destroy(req, pool, vol_new)
- req.async_status(-303, int((float(copied) / copy_size) * 100))
- raise TargetdError(-303, "Unexpected exception: %s" % (str(e)))
+ vg_name, thin_pool = get_vg_lv(pool)
+ copy_size = 0
+
+ with vgopen(vg_name) as vg:
+ if thin_pool:
+ vg.lvFromName(vol_orig).snapshot(vol_new)
+ else:
+ copy_size = vg.lvFromName(vol_orig).getSize()
+
+ if copy_size > 0:
+ create(req, pool, vol_new, copy_size)
+
+ copied = 0 # Used in except, make sure exists before we catch
+ # exception
+
+ try:
+ src_path = "/dev/%s/%s" % (pool, vol_orig)
+ dst_path = "/dev/%s/%s" % (pool, vol_new)
+
+ start_time = time.clock()
+ with open(src_path, 'rb') as fsrc:
+ with open(dst_path, 'wb') as fdst:
+ while copied != copy_size:
+ buf = fsrc.read(1024 * 1024)
+ if not buf:
+ break
+ fdst.write(buf)
+ copied += len(buf)
+ if time.clock() > (start_time + timeout):
+ req.mark_async()
+ req.async_status(0,
+ int((float(copied) / copy_size)
+ * 100))
+ req.complete_maybe_async(0)
+
+ except Exception, e:
+ destroy(req, pool, vol_new)
+ req.async_status(-303, int((float(copied) / copy_size) * 100))
+ raise TargetdError(-303, "Unexpected exception: %s" % (str(e)))
def export_list(req):
@@ -157,7 +183,7 @@ def export_list(req):
for mlun in na.mapped_luns:
mlun_vg, mlun_name = \
mlun.tpg_lun.storage_object.udev_path.split("/")[2:]
- with vgopen(mlun_vg) as vg:
+ with vgopen(get_vg_lv(mlun_vg)[0]) as vg:
lv = vg.lvFromName(mlun_name)
exports.append(
dict(initiator_wwn=na.node_wwn, lun=mlun.mapped_lun,
@@ -176,7 +202,7 @@ def _exports_save_config():
def export_create(req, pool, vol, initiator_wwn, lun):
# get wwn of volume so LIO can export as vpd83 info
- with vgopen(pool) as vg:
+ with vgopen(get_vg_lv(pool)[0]) as vg:
vol_serial = vg.lvFromName(vol).getUuid()
# only add new SO if it doesn't exist
@@ -281,8 +307,8 @@ def block_pools(req):
results = []
for pool in pools:
- with vgopen(pool) as vg:
- results.append(dict(name=vg.getName(), size=vg.getSize(),
+ with vgopen(get_vg_lv(pool)[0]) as vg:
+ results.append(dict(name=pool, size=vg.getSize(),
free_size=vg.getFreeSize(), type='block',
uuid=vg.getUuid()))
--
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