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kernfs: move struct kernfs_root out of the public view. 

There is no need to have struct kernfs_root be part of kernfs.h for
the whole kernel to see and poke around it.  Move it internal to kernfs
code and provide a helper function, kernfs_root_to_node(), to handle the
one field that kernfs users were directly accessing from the structure.

Cc: Imran Khan <imran.f.khan@oracle.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220222070713.3517679-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2022-02-22 08:07:13 +01:00
parent b4ae8c2fb6
commit f2eb478f2f
6 changed files with 36 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@ -3221,13 +3221,13 @@ static int __init rdtgroup_setup_root(void)
list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
ret = rdtgroup_add_files(rdt_root->kn, RF_CTRL_BASE);
ret = rdtgroup_add_files(kernfs_root_to_node(rdt_root), RF_CTRL_BASE);
if (ret) {
kernfs_destroy_root(rdt_root);
goto out;
}
rdtgroup_default.kn = rdt_root->kn;
rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
kernfs_activate(rdtgroup_default.kn);
out:

9
fs/kernfs/dir.c
View File

@ -970,6 +970,15 @@ void kernfs_destroy_root(struct kernfs_root *root)
kernfs_put(root->kn); /* will also free @root */
}
/**
* kernfs_root_to_node - return the kernfs_node associated with a kernfs_root
* @root: root to use to lookup
*/
struct kernfs_node *kernfs_root_to_node(struct kernfs_root *root)
{
return root->kn;
}
/**
* kernfs_create_dir_ns - create a directory
* @parent: parent in which to create a new directory

18
fs/kernfs/kernfs-internal.h
View File

@ -31,6 +31,24 @@ struct kernfs_iattrs {
atomic_t user_xattr_size;
};
struct kernfs_root {
/* published fields */
struct kernfs_node *kn;
unsigned int flags; /* KERNFS_ROOT_* flags */
/* private fields, do not use outside kernfs proper */
struct idr ino_idr;
u32 last_id_lowbits;
u32 id_highbits;
struct kernfs_syscall_ops *syscall_ops;
/* list of kernfs_super_info of this root, protected by kernfs_rwsem */
struct list_head supers;
wait_queue_head_t deactivate_waitq;
struct rw_semaphore kernfs_rwsem;
};
/* +1 to avoid triggering overflow warning when negating it */
#define KN_DEACTIVATED_BIAS (INT_MIN + 1)

2
fs/sysfs/mount.c
View File

@ -103,7 +103,7 @@ int __init sysfs_init(void)
if (IS_ERR(sysfs_root))
return PTR_ERR(sysfs_root);
sysfs_root_kn = sysfs_root->kn;
sysfs_root_kn = kernfs_root_to_node(sysfs_root);
err = register_filesystem(&sysfs_fs_type);
if (err) {

4
include/linux/kernfs.h
View File

@ -185,6 +185,7 @@ struct kernfs_syscall_ops {
struct kernfs_root *root);
};
#if 0
struct kernfs_root {
/* published fields */
struct kernfs_node *kn;
@ -202,6 +203,9 @@ struct kernfs_root {
wait_queue_head_t deactivate_waitq;
struct rw_semaphore kernfs_rwsem;
};
#endif
struct kernfs_node *kernfs_root_to_node(struct kernfs_root *root);
struct kernfs_open_file {
/* published fields */

4
kernel/cgroup/cgroup.c
View File

@ -1302,7 +1302,7 @@ static struct css_set *find_css_set(struct css_set *old_cset,
struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root)
{
struct cgroup *root_cgrp = kf_root->kn->priv;
struct cgroup *root_cgrp = kernfs_root_to_node(kf_root)->priv;
return root_cgrp->root;
}
@ -2025,7 +2025,7 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
ret = PTR_ERR(root->kf_root);
goto exit_root_id;
}
root_cgrp->kn = root->kf_root->kn;
root_cgrp->kn = kernfs_root_to_node(root->kf_root);
WARN_ON_ONCE(cgroup_ino(root_cgrp) != 1);
root_cgrp->ancestor_ids[0] = cgroup_id(root_cgrp);