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| author | ArthurChiao <sjtuyananzhao@gmail.com> | 2021-09-08 16:08:15 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2021-09-13 08:08:46 -1000 |
| commit | c0002d11d79900f8aa5c8375336434940d6afedf (patch) | |
| tree | 43fbe04767d180b8b1baa08409b758d67903156f /Documentation | |
| parent | b94f9ac79a7395c2d6171cc753cc27942df0be73 (diff) | |
| download | lwn-c0002d11d79900f8aa5c8375336434940d6afedf.tar.gz lwn-c0002d11d79900f8aa5c8375336434940d6afedf.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index fc53ae0e96b9..4d8c27eca96b 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -2170,19 +2170,19 @@ existing device files. 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 -create bpf programs of the BPF_CGROUP_DEVICE type and attach them -to cgroups. On an attempt to access a device file, corresponding -BPF programs will be executed, and depending 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 -structure, which describes the device access attempt: access type -(mknod/read/write) and device (type, major and minor numbers). -If the program returns 0, the attempt fails with -EPERM, otherwise -it succeeds. - -An example of BPF_CGROUP_DEVICE program may be found in the kernel -source tree in the tools/testing/selftests/bpf/progs/dev_cgroup.c file. +create bpf programs of type BPF_PROG_TYPE_CGROUP_DEVICE and attach +them to cgroups with BPF_CGROUP_DEVICE flag. On an attempt to access a +device file, corresponding BPF programs will be executed, and depending +on the return value the attempt will succeed or fail with -EPERM. + +A BPF_PROG_TYPE_CGROUP_DEVICE program takes a pointer to the +bpf_cgroup_dev_ctx structure, which describes the device access attempt: +access type (mknod/read/write) and device (type, major and minor numbers). +If the program returns 0, the attempt fails with -EPERM, otherwise it +succeeds. + +An example of BPF_PROG_TYPE_CGROUP_DEVICE program may be found in +tools/testing/selftests/bpf/progs/dev_cgroup.c in the kernel source tree. RDMA |