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| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-01-17 02:25:51 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-02-28 03:29:32 -0500 |
| commit | cf6299b1d00555cd10dc30d95b300d7084128a2c (patch) | |
| tree | f4cd581ee037732a736b70e1fffa220e012be512 /kernel | |
| parent | e34a98d5b226b84a3ed6da93e7a92e65cc1c81ba (diff) | |
| download | linux-0-day-cf6299b1d00555cd10dc30d95b300d7084128a2c.tar.gz linux-0-day-cf6299b1d00555cd10dc30d95b300d7084128a2c.tar.xz | |
cgroup: stash cgroup_root reference into cgroup_fs_context
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/cgroup-internal.h | 3 | ||||
| -rw-r--r-- | kernel/cgroup/cgroup-v1.c | 4 | ||||
| -rw-r--r-- | kernel/cgroup/cgroup.c | 7 |
3 files changed, 10 insertions, 4 deletions
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h index a7b5a41f170ce..3c1613a7648cc 100644 --- a/kernel/cgroup/cgroup-internal.h +++ b/kernel/cgroup/cgroup-internal.h @@ -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, diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 725e9f6fe80d4..45a198c63d6e4 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -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) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index d0cddfbdf5cfc..57f43f63363ab 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -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); |