diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/303-core-0003-cgroup-let-a-symlink-too-be-created-with-a-cftype-fi.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/303-core-0003-cgroup-let-a-symlink-too-be-created-with-a-cftype-fi.patch | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/target/linux/layerscape/patches-5.4/303-core-0003-cgroup-let-a-symlink-too-be-created-with-a-cftype-fi.patch b/target/linux/layerscape/patches-5.4/303-core-0003-cgroup-let-a-symlink-too-be-created-with-a-cftype-fi.patch deleted file mode 100644 index f7edb7411d..0000000000 --- a/target/linux/layerscape/patches-5.4/303-core-0003-cgroup-let-a-symlink-too-be-created-with-a-cftype-fi.patch +++ /dev/null @@ -1,112 +0,0 @@ -From 3b4d888114a5f6c1e848f892a2236db4ccf8345f Mon Sep 17 00:00:00 2001 -From: Angelo Ruocco <angeloruocco90@gmail.com> -Date: Tue, 21 May 2019 10:01:54 +0200 -Subject: [PATCH] cgroup: let a symlink too be created with a cftype file - -This commit enables a cftype to have a symlink (of any name) that -points to the file associated with the cftype. - -Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com> -Signed-off-by: Paolo Valente <paolo.valente@linaro.org> -Signed-off-by: Jens Axboe <axboe@kernel.dk> -(cherry picked from commit 54b7b868e826b294687c439b68ec55fe20cafe5b) -Signed-off-by: Li Yang <leoyang.li@nxp.com> ---- - include/linux/cgroup-defs.h | 3 +++ - kernel/cgroup/cgroup.c | 33 +++++++++++++++++++++++++++++---- - 2 files changed, 32 insertions(+), 4 deletions(-) - ---- a/include/linux/cgroup-defs.h -+++ b/include/linux/cgroup-defs.h -@@ -106,6 +106,8 @@ enum { - CFTYPE_WORLD_WRITABLE = (1 << 4), /* (DON'T USE FOR NEW FILES) S_IWUGO */ - CFTYPE_DEBUG = (1 << 5), /* create when cgroup_debug */ - -+ CFTYPE_SYMLINKED = (1 << 6), /* pointed to by symlink too */ -+ - /* internal flags, do not use outside cgroup core proper */ - __CFTYPE_ONLY_ON_DFL = (1 << 16), /* only on default hierarchy */ - __CFTYPE_NOT_ON_DFL = (1 << 17), /* not on default hierarchy */ -@@ -544,6 +546,7 @@ struct cftype { - * end of cftype array. - */ - char name[MAX_CFTYPE_NAME]; -+ char link_name[MAX_CFTYPE_NAME]; - unsigned long private; - - /* ---- a/kernel/cgroup/cgroup.c -+++ b/kernel/cgroup/cgroup.c -@@ -1465,8 +1465,8 @@ struct cgroup *task_cgroup_from_root(str - - static struct kernfs_syscall_ops cgroup_kf_syscall_ops; - --static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft, -- char *buf) -+static char *cgroup_fill_name(struct cgroup *cgrp, const struct cftype *cft, -+ char *buf, bool write_link_name) - { - struct cgroup_subsys *ss = cft->ss; - -@@ -1476,13 +1476,26 @@ static char *cgroup_file_name(struct cgr - - snprintf(buf, CGROUP_FILE_NAME_MAX, "%s%s.%s", - dbg, cgroup_on_dfl(cgrp) ? ss->name : ss->legacy_name, -- cft->name); -+ write_link_name ? cft->link_name : cft->name); - } else { -- strscpy(buf, cft->name, CGROUP_FILE_NAME_MAX); -+ strscpy(buf, write_link_name ? cft->link_name : cft->name, -+ CGROUP_FILE_NAME_MAX); - } - return buf; - } - -+static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft, -+ char *buf) -+{ -+ return cgroup_fill_name(cgrp, cft, buf, false); -+} -+ -+static char *cgroup_link_name(struct cgroup *cgrp, const struct cftype *cft, -+ char *buf) -+{ -+ return cgroup_fill_name(cgrp, cft, buf, true); -+} -+ - /** - * cgroup_file_mode - deduce file mode of a control file - * @cft: the control file in question -@@ -1641,6 +1654,9 @@ static void cgroup_rm_file(struct cgroup - } - - kernfs_remove_by_name(cgrp->kn, cgroup_file_name(cgrp, cft, name)); -+ if (cft->flags & CFTYPE_SYMLINKED) -+ kernfs_remove_by_name(cgrp->kn, -+ cgroup_link_name(cgrp, cft, name)); - } - - /** -@@ -3896,6 +3912,7 @@ static int cgroup_add_file(struct cgroup - { - char name[CGROUP_FILE_NAME_MAX]; - struct kernfs_node *kn; -+ struct kernfs_node *kn_link; - struct lock_class_key *key = NULL; - int ret; - -@@ -3926,6 +3943,14 @@ static int cgroup_add_file(struct cgroup - spin_unlock_irq(&cgroup_file_kn_lock); - } - -+ if (cft->flags & CFTYPE_SYMLINKED) { -+ kn_link = kernfs_create_link(cgrp->kn, -+ cgroup_link_name(cgrp, cft, name), -+ kn); -+ if (IS_ERR(kn_link)) -+ return PTR_ERR(kn_link); -+ } -+ - return 0; - } - |