Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 4ca0b5c..6ebae6b 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/dir.c - kernfs directory implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/sched.h>
@@ -138,6 +137,9 @@
if (kn_from == kn_to)
return strlcpy(buf, "/", buflen);
+ if (!buf)
+ return -EINVAL;
+
common = kernfs_common_ancestor(kn_from, kn_to);
if (WARN_ON(!common))
return -EINVAL;
@@ -145,8 +147,7 @@
depth_to = kernfs_depth(common, kn_to);
depth_from = kernfs_depth(common, kn_from);
- if (buf)
- buf[0] = '\0';
+ buf[0] = '\0';
for (i = 0; i < depth_from; i++)
len += strlcpy(buf + len, parent_str,
@@ -431,7 +432,6 @@
*/
void kernfs_put_active(struct kernfs_node *kn)
{
- struct kernfs_root *root = kernfs_root(kn);
int v;
if (unlikely(!kn))
@@ -443,7 +443,7 @@
if (likely(v != KN_DEACTIVATED_BIAS))
return;
- wake_up_all(&root->deactivate_waitq);
+ wake_up_all(&kernfs_root(kn)->deactivate_waitq);
}
/**
@@ -532,12 +532,9 @@
kfree_const(kn->name);
if (kn->iattr) {
- if (kn->iattr->ia_secdata)
- security_release_secctx(kn->iattr->ia_secdata,
- kn->iattr->ia_secdata_len);
simple_xattrs_free(&kn->iattr->xattrs);
+ kmem_cache_free(kernfs_iattrs_cache, kn->iattr);
}
- kfree(kn->iattr);
spin_lock(&kernfs_idr_lock);
idr_remove(&root->ino_idr, kn->id.ino);
spin_unlock(&kernfs_idr_lock);
@@ -618,6 +615,7 @@
}
static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
+ struct kernfs_node *parent,
const char *name, umode_t mode,
kuid_t uid, kgid_t gid,
unsigned flags)
@@ -650,11 +648,10 @@
kn->id.generation = gen;
/*
- * set ino first. This barrier is paired with atomic_inc_not_zero in
+ * set ino first. This RELEASE is paired with atomic_inc_not_zero in
* kernfs_find_and_get_node_by_ino
*/
- smp_mb__before_atomic();
- atomic_set(&kn->count, 1);
+ atomic_set_release(&kn->count, 1);
atomic_set(&kn->active, KN_DEACTIVATED_BIAS);
RB_CLEAR_NODE(&kn->rb);
@@ -674,6 +671,12 @@
goto err_out3;
}
+ if (parent) {
+ ret = security_kernfs_init_security(parent, kn);
+ if (ret)
+ goto err_out3;
+ }
+
return kn;
err_out3:
@@ -692,7 +695,7 @@
{
struct kernfs_node *kn;
- kn = __kernfs_new_node(kernfs_root(parent),
+ kn = __kernfs_new_node(kernfs_root(parent), parent,
name, mode, uid, gid, flags);
if (kn) {
kernfs_get(parent);
@@ -795,9 +798,8 @@
/* Update timestamps on the parent */
ps_iattr = parent->iattr;
if (ps_iattr) {
- struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
- ktime_get_real_ts64(&ps_iattrs->ia_ctime);
- ps_iattrs->ia_mtime = ps_iattrs->ia_ctime;
+ ktime_get_real_ts64(&ps_iattr->ia_ctime);
+ ps_iattr->ia_mtime = ps_iattr->ia_ctime;
}
mutex_unlock(&kernfs_mutex);
@@ -962,7 +964,7 @@
INIT_LIST_HEAD(&root->supers);
root->next_generation = 1;
- kn = __kernfs_new_node(root, "", S_IFDIR | S_IRUGO | S_IXUGO,
+ kn = __kernfs_new_node(root, NULL, "", S_IFDIR | S_IRUGO | S_IXUGO,
GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
KERNFS_DIR);
if (!kn) {
@@ -1329,9 +1331,8 @@
/* update timestamps on the parent */
if (ps_iattr) {
- ktime_get_real_ts64(&ps_iattr->ia_iattr.ia_ctime);
- ps_iattr->ia_iattr.ia_mtime =
- ps_iattr->ia_iattr.ia_ctime;
+ ktime_get_real_ts64(&ps_iattr->ia_ctime);
+ ps_iattr->ia_mtime = ps_iattr->ia_ctime;
}
kernfs_put(pos);