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cgroup_do_mount(): massage calling conventions

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pass it fs_context instead of fs_type/flags/root triple, have
it return int instead of dentry and make it deal with setting
fc->root.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2019-01-17 02:44:07 -05:00
parent cf6299b1d0
commit 71d883c37e
3 changed files with 29 additions and 36 deletions
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17
kernel/cgroup/cgroup-v1.c
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@@ -1141,7 +1141,6 @@ int cgroup1_get_tree(struct fs_context *fc)
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
struct cgroup_root *root;
struct cgroup_subsys *ss;
struct dentry *dentry;
int i, ret;
/* Check if the caller has permission to mount. */
@@ -1253,21 +1252,15 @@ out_free:
if (ret)
return ret;
dentry = cgroup_do_mount(&cgroup_fs_type, fc->sb_flags, root,
CGROUP_SUPER_MAGIC, ns);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
if (percpu_ref_is_dying(&root->cgrp.self.refcnt)) {
struct super_block *sb = dentry->d_sb;
dput(dentry);
ret = cgroup_do_mount(fc, CGROUP_SUPER_MAGIC, ns);
if (!ret && percpu_ref_is_dying(&root->cgrp.self.refcnt)) {
struct super_block *sb = fc->root->d_sb;
dput(fc->root);
deactivate_locked_super(sb);
msleep(10);
return restart_syscall();
}
fc->root = dentry;
return 0;
return ret;
}
static int __init cgroup1_wq_init(void)