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cgroup: stash cgroup_root reference into cgroup_fs_context

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Note that this reference is *NOT* contributing to refcount of
cgroup_root in question and is valid only until cgroup_do_mount()
returns.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-01-17 02:25:51 -05:00
parent e34a98d5b2
commit cf6299b1d0
3 changed files with 10 additions and 4 deletions
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3
kernel/cgroup/cgroup-internal.h
View File

@ -41,6 +41,7 @@ extern void __init enable_debug_cgroup(void);
* The cgroup filesystem superblock creation/mount context.
*/
struct cgroup_fs_context {
struct cgroup_root *root;
unsigned int flags; /* CGRP_ROOT_* flags */
/* cgroup1 bits */
@ -208,7 +209,7 @@ int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen,
struct cgroup_namespace *ns);
void cgroup_free_root(struct cgroup_root *root);
void init_cgroup_root(struct cgroup_root *root, struct cgroup_fs_context *ctx);
void init_cgroup_root(struct cgroup_fs_context *ctx);
int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask);
int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask);
struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,

4
kernel/cgroup/cgroup-v1.c
View File

@ -1208,6 +1208,7 @@ int cgroup1_get_tree(struct fs_context *fc)
if (root->flags ^ ctx->flags)
pr_warn("new mount options do not match the existing superblock, will be ignored\n");
ctx->root = root;
ret = 0;
goto out_unlock;
}
@ -1234,7 +1235,8 @@ int cgroup1_get_tree(struct fs_context *fc)
goto out_unlock;
}
init_cgroup_root(root, ctx);
ctx->root = root;
init_cgroup_root(ctx);
ret = cgroup_setup_root(root, ctx->subsys_mask);
if (ret)

7
kernel/cgroup/cgroup.c
View File

@ -1915,8 +1915,9 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
INIT_WORK(&cgrp->release_agent_work, cgroup1_release_agent);
}
void init_cgroup_root(struct cgroup_root *root, struct cgroup_fs_context *ctx)
void init_cgroup_root(struct cgroup_fs_context *ctx)
{
struct cgroup_root *root = ctx->root;
struct cgroup *cgrp = &root->cgrp;
INIT_LIST_HEAD(&root->root_list);
@ -2098,6 +2099,7 @@ static int cgroup_get_tree(struct fs_context *fc)
cgrp_dfl_visible = true;
cgroup_get_live(&cgrp_dfl_root.cgrp);
ctx->root = &cgrp_dfl_root;
root = cgroup_do_mount(&cgroup2_fs_type, fc->sb_flags, &cgrp_dfl_root,
CGROUP2_SUPER_MAGIC, ns);
@ -5374,7 +5376,8 @@ int __init cgroup_init_early(void)
struct cgroup_subsys *ss;
int i;
init_cgroup_root(&cgrp_dfl_root, &ctx);
ctx.root = &cgrp_dfl_root;
init_cgroup_root(&ctx);
cgrp_dfl_root.cgrp.self.flags |= CSS_NO_REF;
RCU_INIT_POINTER(init_task.cgroups, &init_css_set);