bugfix: fetch the right device number which great than 255 by yyb196 · Pull Request #39212 · moby/moby

yyb196 · 2019-05-14T07:40:56Z

Signed-off-by: frankyang yyb196@gmail.com

- What I did

fix a bug which cause an error like :
write 4349:48 0 to blkio.throttle.read_bps_device: write /sys/fs/cgroup/blkio/xxx/cid/blkio.throttle.read_bps_device: no such device

the container has config "BlkioDeviceReadBps":[{"Path":"/dev/vdt","Rate":0}]

and I foud stat /dev/vdt and ls -l /dev/vdt has different out of device number, which is correct:


#ls -l /dev/vdt
brw-rw---- 1 root disk 253, 304 May 9 17:03 /dev/vdt

#stat /dev/vdt | grep type
Device: 6h/6d Inode: 56051004	Links: 1	Device type: fd, 130

Someone in docker forum ran into the same problem: https://forums.docker.com/t/docker-run-device-read-bps-option-not-working/68044 in his case is the major number greater than 255.

- How I did it
I correct the way in which we get major and minor device number according to the method new_encode_dev in linux kernel.

- How to verify it
I add two unit test cases.

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

olljanat · 2019-05-14T20:12:29Z

(reserved for my derek commands)

olljanat · 2019-05-14T20:17:55Z

@yyb196 congrats of your first PR to moby 🎂

I'm not familiar this this feature so just to verify that did you test that those unit tests would fail without this fix?

thaJeztah · 2019-05-15T00:43:17Z

ping @kolyshkin PTAL

kolyshkin · 2019-05-15T03:12:31Z

Looks fine, but since x/sys/unix already implemented these, it'll be better to use those. In other words:

import "golang.org/x/sys/unix"
...
d.Major = unix.Major(stat.Rdev)
d.Minor = unix.Minor(stat.Rdev)

@yyb196 can you please update this PR?

codecov · 2019-05-15T08:04:09Z

Codecov Report

❗ No coverage uploaded for pull request base (master@34b5672). Click here to learn what that means.
The diff coverage is 100%.

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yyb196 · 2019-05-15T08:13:51Z

@kolyshkin @olljanat I have change the code and test case according to your advices.

PTALA, thanks a lot.

Using the unix package's methods Major and Minor.

And now the unit test case that I add will fail without this fix.

Because I don't know how to mock system call in go, my test case depends on that we can do unix.Mknode in unit test, then can I mock a temporary device whose major and minor device type great than 255.

kolyshkin · 2019-05-15T18:03:27Z

daemon/daemon_unix_test.go

mknod requires root, so this test case should have something like

if os.Getuid() != 0 { t.Skip("root required") // for mknod }

at the very beginning (so if someone runs go test as non-root, there won't be a fake failure).

Also, make sense to use

t.Parallel()

kolyshkin · 2019-05-15T18:07:48Z

daemon/daemon_unix_test.go

s/mknode/mknod/

kolyshkin · 2019-05-15T18:09:43Z

daemon/daemon_unix_test.go

You can use unix.Mkdev(major, minor) (and define major and minor as constants to not have some "magic numbers" across the code.

kolyshkin · 2019-05-15T18:12:43Z

daemon/daemon_unix_test.go

assert.Check(t, is.Len(weightDevs, 1), "getBlkioWeightDevices")

(you can use assert in other places in your code as well, it makes the code more compact and perhaps more readable)

kolyshkin · 2019-05-15T18:13:56Z

daemon/daemon_unix_test.go

s/"tempDevDirForBlkioThrottleDevices"/t.Name()/

or, if you like it more, "tempDevDir"+t.Name()

kolyshkin · 2019-05-15T18:22:53Z

daemon/daemon_unix_test.go

This second test is the same as the first one, except for function called. Can you please combine the code so it won't repeat twice?

kolyshkin · 2019-05-15T18:23:36Z

@yyb196 thanks so much for the update! I have left some comments

Signed-off-by: frankyang <yyb196@gmail.com>

yyb196 · 2019-05-16T07:38:43Z

@kolyshkin thanks for your comments, I have updated. PTALA.

kolyshkin

LGTM, thanks for good work!

thaJeztah

LGTM, thanks!

GordonTheTurtle added the status/0-triage label May 14, 2019

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yyb196 force-pushed the devno branch from d2c8f30 to 5737c06 Compare May 15, 2019 08:04

kolyshkin reviewed May 15, 2019

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s/mknode/mknod/

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bugfix: fetch the right device number which great than 255

b9f3191

Signed-off-by: frankyang <yyb196@gmail.com>

yyb196 force-pushed the devno branch from 5737c06 to b9f3191 Compare May 16, 2019 07:33

kolyshkin approved these changes May 16, 2019

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thaJeztah added status/2-code-review and removed status/0-triage labels May 20, 2019

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thaJeztah added process/cherry-pick rebuild/* status/4-merge and removed status/2-code-review labels May 20, 2019

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cpuguy83 merged commit 9808f60 into moby:master May 20, 2019

This was referenced May 21, 2019

[18.09 backport] bugfix: fetch the right device number which great than 255 docker-archive/engine#223

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[19.03 backport] bugfix: fetch the right device number which great than 255 docker-archive/engine#224

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thaJeztah added process/cherry-picked and removed process/cherry-pick labels May 25, 2019

thaJeztah mentioned this pull request Jun 13, 2019

Stat_t on MIPS uses 32-bit fields for Dev and Rdev, so we need to cast these to uint64. #37490

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thaJeztah added this to the 20.03.0 milestone Apr 2, 2020

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