def load_labels(self, dev):
"""
Load vdev label informations, return the four labels
Return
[VDevLabel]
"""
l = []
l.append(VDevLabel(ZIO.read(dev, 0, VDEVLABEL_SIZE)))
l.append(VDevLabel(ZIO.read(dev, VDEVLABEL_SIZE, VDEVLABEL_SIZE)))
l.append(VDevLabel(ZIO.read(dev, -VDEVLABEL_SIZE * 2, VDEVLABEL_SIZE, 2)))
l.append(VDevLabel(ZIO.read(dev, -VDEVLABEL_SIZE, VDEVLABEL_SIZE, 2)))
return l
def load_labels(self, dev):
"""
Load vdev label informations, return the four labels
Return
[VDevLabel]
"""
l = []
l.append(VDevLabel(ZIO.read(dev, 0, VDEVLABEL_SIZE)))
l.append(VDevLabel(ZIO.read(dev, VDEVLABEL_SIZE, VDEVLABEL_SIZE)))
l.append(
VDevLabel(ZIO.read(dev, -VDEVLABEL_SIZE * 2, VDEVLABEL_SIZE, 2)))
l.append(VDevLabel(ZIO.read(dev, -VDEVLABEL_SIZE, VDEVLABEL_SIZE, 2)))
return l
def get_blk(self, id):
"""
Get level0 block of this dnode by id
indirect block onlys contain block pointers, its size is 1 << indblkshift. maxblkid is the max id
of level 0 blocks
"""
bp_per_indirectblk = (1 << self.indblkshift) / BlockPtr_SIZE
if id > self.maxblkid:
return None
debug('bp_per_indirectblk=%d, nlevels %d' %
(bp_per_indirectblk, self.nlevels))
# compute offset of every level from bottom to top
map = []
blkid = id
for level in range(0, self.nlevels - 1):
blkid, offset = blkid / bp_per_indirectblk, blkid % bp_per_indirectblk
map.append((blkid, offset))
debug('levels offset for blkid %d: %s' % (id, map))
toplevel_blkid = blkid
# top level only can have 3 blocks at most, its blkid must be less than
# the number of real blkptr we have. if it's greater than 3, it means that
# we should have one more level then.
if toplevel_blkid >= len(self.blkptr):
return None
bp = self.blkptr[toplevel_blkid]
blk_data = ZIO.read_blk(self.vdev, bp)
levels = range(self.nlevels - 1)
levels.reverse()
for level in levels:
# offset in blk really matters, blkid in level doesn't
offset = map[level][1]
debug('offset %d in level %d' % (offset, level))
bp = BlockPtr(get_record(blk_data, BlockPtr_SIZE, offset))
blk_data = ZIO.read_blk(self.vdev, bp)
return blk_data
def get_blk(self, id):
"""
Get level0 block of this dnode by id
indirect block onlys contain block pointers, its size is 1 << indblkshift. maxblkid is the max id
of level 0 blocks
"""
bp_per_indirectblk = (1 << self.indblkshift) / BlockPtr_SIZE
if id > self.maxblkid:
return None
debug('bp_per_indirectblk=%d, nlevels %d' %(bp_per_indirectblk, self.nlevels))
# compute offset of every level from bottom to top
map = []
blkid = id
for level in range(0, self.nlevels-1):
blkid, offset = blkid / bp_per_indirectblk, blkid % bp_per_indirectblk
map.append((blkid, offset))
debug('levels offset for blkid %d: %s' % (id, map))
toplevel_blkid = blkid
# top level only can have 3 blocks at most, its blkid must be less than
# the number of real blkptr we have. if it's greater than 3, it means that
# we should have one more level then.
if toplevel_blkid >= len(self.blkptr):
return None
bp = self.blkptr[toplevel_blkid]
blk_data = ZIO.read_blk(self.vdev, bp)
levels = range(self.nlevels - 1)
levels.reverse()
for level in levels:
# offset in blk really matters, blkid in level doesn't
offset = map[level][1]
debug('offset %d in level %d' % (offset, level))
bp = BlockPtr(get_record(blk_data, BlockPtr_SIZE, offset))
blk_data = ZIO.read_blk(self.vdev, bp)
return blk_data
