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Create a znode command for sdb. Also create znode2inode and
inode2znode commands. Signed-off-by: Paul Zuchowski <[email protected]>
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‎sdb/commands/zfs/znode.py‎

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#
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# Copyright 2019 Delphix
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# Copyright 2021 Datto, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# pylint: disable=missing-docstring
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from typing import Iterable
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import os
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import drgn
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from drgn.helpers.linux.fs import inode_path
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import sdb
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from sdb.target import type_canonicalize, get_prog
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from sdb.command import Command
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class Inode2znode(Command):
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"""
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Convert an inode to a znode and display it.
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sdb> echo 0xffff9ca45647f588 | cast struct inode * | itoz
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ADDR OBJ UNLINKED BLKSZ SIZE ...
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0xffff9ca45647f398 2 0 29184 28772 ...
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"""
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names = ["inode2znode", "i2z", "itoz"]
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def _call(self, objs: Iterable[drgn.Object]) -> None:
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for obj in objs:
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obj_type = type_canonicalize(obj.type_)
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if obj_type.kind != drgn.TypeKind.POINTER:
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raise sdb.CommandError(
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self.name,
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f"'{obj.type_.type_name()}' is not a valid pointer type")
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obj = drgn.Object(get_prog(),
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type=obj.type_.type,
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address=obj.value_())
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znode = drgn.container_of(obj.address_of_(), 'struct znode',
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'z_inode')
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znodes = sdb.execute_pipeline([znode], [Znode()])
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Znode.pretty_print(znode, znodes)
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class Znode2inode(Command):
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"""
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Convert a znode to an inode and display it.
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sdb> echo 0xffff9ca45647f398 | znode | ztoi
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ADDR INO MODE LINKS BLOCKS SB
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0xffff9ca45647f588 2 33184 1 1 0xffff9ca464ae8800
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sdb> znode | znode2inode
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ADDR INO MODE LINKS BLOCKS SB
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0xffff9ca456478638 2 16877 2 1 0xffff9ca486819800
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0xffff9ca456478a80 34 16877 2 1 0xffff9ca464ae8800
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0xffff9ca456478ec8 -1 16895 1 0 0xffff9ca464ae8800
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0xffff9ca45647b108 3 33184 1 1 0xffff9ca464ae8800
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0xffff9ca45647b998 -1 16895 1 0 0xffff9ca486819800
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0xffff9ca45647c228 3 16877 2 1 0xffff9ca486819800
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0xffff9ca45647dbd8 34 16877 4 1 0xffff9ca486819800
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0xffff9ca45647e8b0 34 16877 2 1 0xffff9ca464aeb000
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0xffff9ca45647f588 2 33184 1 1 0xffff9ca464ae8800
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0xffff9ca45647f9d0 -1 16895 1 0 0xffff9ca464aeb000
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"""
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names = ["znode2inode", "z2i", "ztoi"]
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@staticmethod
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def inode_print(znode: drgn.Object) -> None:
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inode = znode.z_inode
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i = drgn.cast('int', znode.z_id)
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print("{:18} {:>8} {:>8} {:>8} {:>8} {:18}".format(
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hex(inode.address_), int(i), int(inode.i_mode), int(inode.i_nlink),
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int(inode.i_blocks), hex(int(inode.i_sb))))
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def _call(self, objs: Iterable[drgn.Object]) -> None:
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print("{:18} {:>8} {:>8} {:>8} {:>8} {:18}".format(
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"ADDR", "INO", "MODE", "LINKS", "BLOCKS", "SB"))
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for obj in objs:
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obj_type = type_canonicalize(obj.type_)
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if obj_type.kind != drgn.TypeKind.POINTER:
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raise sdb.CommandError(
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self.name,
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f"'{obj.type_.type_name()}' is not a valid pointer type")
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obj = drgn.Object(get_prog(),
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type=obj.type_.type,
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address=obj.value_())
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self.inode_print(obj)
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class Znode(sdb.Locator, sdb.PrettyPrinter):
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"""
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Iterate and pretty-print znodes
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DESCRIPTION
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Iterate znodes or convert an address to a znode
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and display it.
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sdb> znode
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ADDR OBJ UNLINKED BLKSZ SIZE ...
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0xffff9ca456478448 2 0 512 2 ...
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0xffff9ca456478890 34 0 512 6 ...
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0xffff9ca456478cd8 -1 0 0 0 ...
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0xffff9ca45647af18 3 0 29696 29257 ...
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0xffff9ca45647b7a8 -1 0 0 0 ...
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0xffff9ca45647c038 3 0 512 2 ...
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0xffff9ca45647d9e8 34 0 512 4 ...
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0xffff9ca45647e6c0 34 0 512 4 ...
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0xffff9ca45647f398 2 0 29184 28772 ...
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0xffff9ca45647f7e0 -1 0 0 0 ...
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sdb> echo 0xffff9ca45647f398 | znode
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ADDR OBJ UNLINKED BLKSZ SIZE ...
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0xffff9ca45647f398 2 0 29184 28772 ...
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"""
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names = ["znode"]
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input_type = "znode_t *"
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output_type = "znode_t *"
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def pretty_print(self, objs: Iterable[drgn.Object]) -> None:
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print("{:18} {:>8} {:8} {:>8} {:>18} {:>18} {:>18} {:<18}".format(
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"ADDR", "OBJ", "UNLINKED", "BLKSZ", "SIZE", "INODE", "ZFSVFS", "FILENAME"))
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for znode in objs:
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i = drgn.cast('int', znode.z_id)
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inode = znode.z_inode
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ipath = inode_path(inode)
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fn = ""
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if ipath is not None:
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fn = os.fsdecode(ipath)
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print(
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"{:18} {:>8d} {:>8d} {:>8d} {:>18} {:>18} {:>18} {:<18}".format(
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hex(znode), int(i), int(znode.z_unlinked),
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int(znode.z_blksz), int(znode.z_size),
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hex(znode.z_inode.address_of_()),
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hex(znode.z_inode.i_sb.s_fs_info), str(fn)))
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def no_input(self) -> drgn.Object:
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znode_cache = drgn.cast("spl_kmem_cache_t *",
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sdb.get_object("znode_cache"))
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znode_kmem = znode_cache.skc_linux_cache
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znodes = sdb.execute_pipeline(
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[znode_kmem],
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[sdb.Walk(), sdb.Cast(["znode_t *"])],
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)
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for znode in znodes:
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if znode.z_id != 0:
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yield znode

‎tests/integration/data/regression_output/zfs/echo 0xffffa08884646ec0 | znode‎

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ADDR OBJ UNLINKED BLKSZ SIZE INODE ZFSVFS FILENAME
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0xffffa08884646ec0 1032 0 1024 581 0xffffa088846470b8 0xffffa08953ea8000 etc/profile

‎tests/integration/data/regression_output/zfs/echo 0xffffa08884646ec0 | znode | znode2inode‎

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ADDR INO MODE LINKS BLOCKS SB
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0xffffa088846470b8 1032 33188 1 2 0xffffa08955983800

‎tests/integration/data/regression_output/zfs/echo 0xffffa088846470b8 | cast struct inode * | inode2znode‎

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ADDR OBJ UNLINKED BLKSZ SIZE INODE ZFSVFS FILENAME
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0xffffa08884646ec0 1032 0 1024 581 0xffffa088846470b8 0xffffa08953ea8000 etc/profile

‎tests/integration/data/regression_output/zfs/znode |head 10 |znode‎

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ADDR OBJ UNLINKED BLKSZ SIZE INODE ZFSVFS FILENAME
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0xffffa08884644000 123 0 512 7 0xffffa088846441f8 0xffffa08953ea8000 etc/profile.d
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0xffffa08884644440 68902 0 512 298 0xffffa08884644638 0xffffa08953ea8000 usr/lib/systemd/user/gpg-agent-browser.socket
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0xffffa08884644880 68905 0 512 223 0xffffa08884644a78 0xffffa08953ea8000 usr/lib/systemd/user/gpg-agent.service
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0xffffa08884644cc0 68898 0 512 231 0xffffa08884644eb8 0xffffa08953ea8000 usr/lib/systemd/user/dirmngr.service
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0xffffa08884645100 1900 0 4096 3635 0xffffa088846452f8 0xffffa08953ea8000 etc/security/group.conf
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0xffffa08884645540 68904 0 512 308 0xffffa08884645738 0xffffa08953ea8000 usr/lib/systemd/user/gpg-agent-ssh.socket
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0xffffa08884645980 2037 0 512 96 0xffffa08884645b78 0xffffa08953ea8000 etc/profile.d/01-locale-fix.sh
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0xffffa08884645dc0 67553 0 512 27 0xffffa08884645fb8 0xffffa08953ea8000 usr/lib/systemd/user/sockets.target.wants/gpg-agent-browser.socket
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0xffffa08884646200 68899 0 512 204 0xffffa088846463f8 0xffffa08953ea8000 usr/lib/systemd/user/dirmngr.socket
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0xffffa08884646640 67554 0 512 25 0xffffa08884646838 0xffffa08953ea8000 usr/lib/systemd/user/sockets.target.wants/gpg-agent-extra.socket

‎tests/integration/test_zfs_generic.py‎

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"spa data | vdev | metaslab | filter 'obj.ms_loaded == 1' | head 1 | member ms_sm.sm_phys.smp_histogram | zhist",
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"spa data | vdev | metaslab | filter 'obj.ms_loaded == 1' | head 1 | member ms_sm.sm_phys.smp_histogram | zhist 9",
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"spa data | vdev | metaslab | filter 'obj.ms_loaded == 1' | head 1 | member ms_allocatable.rt_histogram | zhist",
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# znode
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"znode |head 10 |znode",
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"echo 0xffffa08884646ec0 | znode",
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"echo 0xffffa08884646ec0 | znode | znode2inode",
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"echo 0xffffa088846470b8 | cast struct inode * | inode2znode",
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] # yapf: disable
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