def readblock(name, offset, size):
'''
Read (direct IO) the content of device 'name' at offset, size bytes
'''
# direct io must be aligned on block size boundaries
if (size % 512) or (offset % 512):
raise se.MiscBlockReadException(name, offset, size)
left = size
ret = ""
baseoffset = offset
while left > 0:
(iounit, count, iooffset) = _alignData(left, offset)
cmd = [constants.EXT_DD]
if fileUtils.pathRequiresFlagForDirectIO(name):
cmd.append("iflag=%s" % DIRECTFLAG)
cmd.extend(["skip=%d" % iooffset, "bs=%d" % iounit, "if=%s" % name,
"count=%s" % count])
(rc, out, err) = execCmd(cmd, raw=True)
if rc:
raise se.MiscBlockReadException(name, offset, size)
if not validateDDBytes(err.splitlines(), iounit * count):
raise se.MiscBlockReadIncomplete(name, offset, size)
ret += out
left = left % iounit
offset = baseoffset + size - left
return ret.splitlines()
def readblock(name, offset, size):
'''
Read (direct IO) the content of device 'name' at offset, size bytes
'''
# direct io must be aligned on block size boundaries
if (size % 512) or (offset % 512):
raise se.MiscBlockReadException(name, offset, size)
left = size
ret = ""
baseoffset = offset
while left > 0:
(iounit, count, iooffset) = _alignData(left, offset)
cmd = [constants.EXT_DD]
if fileUtils.pathRequiresFlagForDirectIO(name):
cmd.append("iflag=%s" % DIRECTFLAG)
cmd.extend(["skip=%d" % iooffset, "bs=%d" % iounit, "if=%s" % name,
"count=%s" % count])
(rc, out, err) = execCmd(cmd, raw=True)
if rc:
raise se.MiscBlockReadException(name, offset, size)
if not validateDDBytes(err.splitlines(), iounit * count):
raise se.MiscBlockReadIncomplete(name, offset, size)
ret += out
left = left % iounit
offset = baseoffset + size - left
return ret.splitlines()
def ddWatchCopy(src, dst, stop, size, offset=0, recoveryCallback=None):
"""
Copy src to dst using dd command with stop abilities
"""
try:
size = int(size)
except ValueError:
raise se.InvalidParameterException("size", "size = %s" % (size,))
try:
offset = int(offset)
except ValueError:
raise se.InvalidParameterException("offset", "offset = %s" % (offset,))
left = size
baseoffset = offset
while left > 0:
(iounit, count, iooffset) = _alignData(left, offset)
oflag = None
conv = "notrunc"
if (iounit % 512) == 0:
if fileUtils.pathRequiresFlagForDirectIO(dst):
oflag = DIRECTFLAG
else:
conv += ",%s" % DATASYNCFLAG
cmd = [constants.EXT_DD, "if=%s" % src, "of=%s" % dst,
"bs=%d" % iounit, "seek=%s" % iooffset, "skip=%s" % iooffset,
"conv=%s" % conv, 'count=%s' % count]
if oflag:
cmd.append("oflag=%s" % oflag)
if not stop:
(rc, out, err) = execCmd(cmd, nice=utils.NICENESS.HIGH,
ioclass=utils.IOCLASS.IDLE,
deathSignal=signal.SIGKILL)
else:
(rc, out, err) = watchCmd(cmd, stop=stop,
recoveryCallback=recoveryCallback,
nice=utils.NICENESS.HIGH,
ioclass=utils.IOCLASS.IDLE)
if rc:
raise se.MiscBlockWriteException(dst, offset, size)
if not validateDDBytes(err, iounit * count):
raise se.MiscBlockWriteIncomplete(dst, offset, size)
left = left % iounit
offset = baseoffset + size - left
return (rc, out, err)
def ddWatchCopy(src, dst, stop, size, offset=0, recoveryCallback=None):
"""
Copy src to dst using dd command with stop abilities
"""
try:
size = int(size)
except ValueError:
raise se.InvalidParameterException("size", "size = %s" % (size,))
try:
offset = int(offset)
except ValueError:
raise se.InvalidParameterException("offset", "offset = %s" % (offset,))
left = size
baseoffset = offset
while left > 0:
(iounit, count, iooffset) = _alignData(left, offset)
oflag = None
conv = "notrunc"
if (iounit % 512) == 0:
if fileUtils.pathRequiresFlagForDirectIO(dst):
oflag = DIRECTFLAG
else:
conv += ",%s" % DATASYNCFLAG
cmd = [constants.EXT_DD, "if=%s" % src, "of=%s" % dst,
"bs=%d" % iounit, "seek=%s" % iooffset, "skip=%s" % iooffset,
"conv=%s" % conv, 'count=%s' % count]
if oflag:
cmd.append("oflag=%s" % oflag)
if not stop:
(rc, out, err) = execCmd(cmd, sudo=False, nice=utils.NICENESS.HIGH,
ioclass=utils.IOCLASS.IDLE)
else:
(rc, out, err) = watchCmd(cmd, stop=stop,
recoveryCallback=recoveryCallback,
nice=utils.NICENESS.HIGH,
ioclass=utils.IOCLASS.IDLE)
if rc:
raise se.MiscBlockWriteException(dst, offset, size)
if not validateDDBytes(err, iounit * count):
raise se.MiscBlockWriteIncomplete(dst, offset, size)
left = left % iounit
offset = baseoffset + size - left
return (rc, out, err)
def _readfile(name, buffersize=None):
cmd = [constants.EXT_DD]
if fileUtils.pathRequiresFlagForDirectIO(name):
cmd.append("iflag=%s" % DIRECTFLAG)
cmd.append("if=%s" % name)
if buffersize:
cmd.extend(["bs=%d" % buffersize, "count=1"])
(rc, out, err) = execCmd(cmd)
if rc:
raise se.MiscFileReadException(name)
return rc, out, err
def _readfile(name, buffersize=None):
cmd = [constants.EXT_DD]
if fileUtils.pathRequiresFlagForDirectIO(name):
cmd.append("iflag=%s" % DIRECTFLAG)
cmd.append("if=%s" % name)
if buffersize:
cmd.extend(["bs=%d" % buffersize, "count=1"])
(rc, out, err) = execCmd(cmd, sudo=False)
if rc:
raise se.MiscFileReadException(name)
return rc, out, err
