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Code Issues Releases Wiki Activity

cgroupv2, docs: fix misinformation in "device controller" section 

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1. Clarify cgroup BPF program type and attach type;
2. Fix file path broken.

Signed-off-by: ArthurChiao <arthurchiao@hotmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
ArthurChiao 2021-09-08 16:08:15 +08:00 committed by Tejun Heo
parent b94f9ac79a
commit c0002d11d7
1 changed files with 11 additions and 11 deletions
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22
Documentation/admin-guide/cgroup-v2.rst
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@ -2170,19 +2170,19 @@ existing device files.
Cgroup v2 device controller has no interface files and is implemented Cgroup v2 device controller has no interface files and is implemented
on top of cgroup BPF. To control access to device files, a user may on top of cgroup BPF. To control access to device files, a user may
create bpf programs of the BPF_CGROUP_DEVICE type and attach them create bpf programs of type BPF_PROG_TYPE_CGROUP_DEVICE and attach
to cgroups. On an attempt to access a device file, corresponding them to cgroups with BPF_CGROUP_DEVICE flag. On an attempt to access a
BPF programs will be executed, and depending on the return value device file, corresponding BPF programs will be executed, and depending
the attempt will succeed or fail with -EPERM. on the return value the attempt will succeed or fail with -EPERM.
A BPF_CGROUP_DEVICE program takes a pointer to the bpf_cgroup_dev_ctx A BPF_PROG_TYPE_CGROUP_DEVICE program takes a pointer to the
structure, which describes the device access attempt: access type bpf_cgroup_dev_ctx structure, which describes the device access attempt:
(mknod/read/write) and device (type, major and minor numbers). access type (mknod/read/write) and device (type, major and minor numbers).
If the program returns 0, the attempt fails with -EPERM, otherwise If the program returns 0, the attempt fails with -EPERM, otherwise it
it succeeds. succeeds.
An example of BPF_CGROUP_DEVICE program may be found in the kernel An example of BPF_PROG_TYPE_CGROUP_DEVICE program may be found in
source tree in the tools/testing/selftests/bpf/progs/dev_cgroup.c file. tools/testing/selftests/bpf/progs/dev_cgroup.c in the kernel source tree.
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