From cde9070d9970eef1f7ec2360586c802a16230ad8 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:50 +0000
Subject: [PATCH] rtl88x2CE_WiFi_linux driver
---
kernel/fs/kernfs/inode.c | 248 +++++++++++++++++++++++++++++-------------------
1 files changed, 149 insertions(+), 99 deletions(-)
diff --git a/kernel/fs/kernfs/inode.c b/kernel/fs/kernfs/inode.c
index 80cebcd..1c9e4ec 100644
--- a/kernel/fs/kernfs/inode.c
+++ b/kernel/fs/kernfs/inode.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/inode.c - kernfs inode 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/pagemap.h>
@@ -31,64 +30,68 @@
.listxattr = kernfs_iop_listxattr,
};
-static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
+static struct kernfs_iattrs *__kernfs_iattrs(struct kernfs_node *kn, int alloc)
{
static DEFINE_MUTEX(iattr_mutex);
struct kernfs_iattrs *ret;
- struct iattr *iattrs;
mutex_lock(&iattr_mutex);
- if (kn->iattr)
+ if (kn->iattr || !alloc)
goto out_unlock;
- kn->iattr = kzalloc(sizeof(struct kernfs_iattrs), GFP_KERNEL);
+ kn->iattr = kmem_cache_zalloc(kernfs_iattrs_cache, GFP_KERNEL);
if (!kn->iattr)
goto out_unlock;
- iattrs = &kn->iattr->ia_iattr;
/* assign default attributes */
- iattrs->ia_mode = kn->mode;
- iattrs->ia_uid = GLOBAL_ROOT_UID;
- iattrs->ia_gid = GLOBAL_ROOT_GID;
+ kn->iattr->ia_uid = GLOBAL_ROOT_UID;
+ kn->iattr->ia_gid = GLOBAL_ROOT_GID;
- ktime_get_real_ts64(&iattrs->ia_atime);
- iattrs->ia_mtime = iattrs->ia_atime;
- iattrs->ia_ctime = iattrs->ia_atime;
+ ktime_get_real_ts64(&kn->iattr->ia_atime);
+ kn->iattr->ia_mtime = kn->iattr->ia_atime;
+ kn->iattr->ia_ctime = kn->iattr->ia_atime;
simple_xattrs_init(&kn->iattr->xattrs);
+ atomic_set(&kn->iattr->nr_user_xattrs, 0);
+ atomic_set(&kn->iattr->user_xattr_size, 0);
out_unlock:
ret = kn->iattr;
mutex_unlock(&iattr_mutex);
return ret;
}
+static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
+{
+ return __kernfs_iattrs(kn, 1);
+}
+
+static struct kernfs_iattrs *kernfs_iattrs_noalloc(struct kernfs_node *kn)
+{
+ return __kernfs_iattrs(kn, 0);
+}
+
int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
{
struct kernfs_iattrs *attrs;
- struct iattr *iattrs;
unsigned int ia_valid = iattr->ia_valid;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
- iattrs = &attrs->ia_iattr;
-
if (ia_valid & ATTR_UID)
- iattrs->ia_uid = iattr->ia_uid;
+ attrs->ia_uid = iattr->ia_uid;
if (ia_valid & ATTR_GID)
- iattrs->ia_gid = iattr->ia_gid;
+ attrs->ia_gid = iattr->ia_gid;
if (ia_valid & ATTR_ATIME)
- iattrs->ia_atime = iattr->ia_atime;
+ attrs->ia_atime = iattr->ia_atime;
if (ia_valid & ATTR_MTIME)
- iattrs->ia_mtime = iattr->ia_mtime;
+ attrs->ia_mtime = iattr->ia_mtime;
if (ia_valid & ATTR_CTIME)
- iattrs->ia_ctime = iattr->ia_ctime;
- if (ia_valid & ATTR_MODE) {
- umode_t mode = iattr->ia_mode;
- iattrs->ia_mode = kn->mode = mode;
- }
+ attrs->ia_ctime = iattr->ia_ctime;
+ if (ia_valid & ATTR_MODE)
+ kn->mode = iattr->ia_mode;
return 0;
}
@@ -135,23 +138,6 @@
return error;
}
-static int kernfs_node_setsecdata(struct kernfs_iattrs *attrs, void **secdata,
- u32 *secdata_len)
-{
- void *old_secdata;
- size_t old_secdata_len;
-
- old_secdata = attrs->ia_secdata;
- old_secdata_len = attrs->ia_secdata_len;
-
- attrs->ia_secdata = *secdata;
- attrs->ia_secdata_len = *secdata_len;
-
- *secdata = old_secdata;
- *secdata_len = old_secdata_len;
- return 0;
-}
-
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
{
struct kernfs_node *kn = kernfs_dentry_node(dentry);
@@ -171,14 +157,14 @@
inode->i_ctime = current_time(inode);
}
-static inline void set_inode_attr(struct inode *inode, struct iattr *iattr)
+static inline void set_inode_attr(struct inode *inode,
+ struct kernfs_iattrs *attrs)
{
- struct super_block *sb = inode->i_sb;
- inode->i_uid = iattr->ia_uid;
- inode->i_gid = iattr->ia_gid;
- inode->i_atime = timespec64_trunc(iattr->ia_atime, sb->s_time_gran);
- inode->i_mtime = timespec64_trunc(iattr->ia_mtime, sb->s_time_gran);
- inode->i_ctime = timespec64_trunc(iattr->ia_ctime, sb->s_time_gran);
+ inode->i_uid = attrs->ia_uid;
+ inode->i_gid = attrs->ia_gid;
+ inode->i_atime = attrs->ia_atime;
+ inode->i_mtime = attrs->ia_mtime;
+ inode->i_ctime = attrs->ia_ctime;
}
static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode)
@@ -186,15 +172,12 @@
struct kernfs_iattrs *attrs = kn->iattr;
inode->i_mode = kn->mode;
- if (attrs) {
+ if (attrs)
/*
* kernfs_node has non-default attributes get them from
* persistent copy in kernfs_node.
*/
- set_inode_attr(inode, &attrs->ia_iattr);
- security_inode_notifysecctx(inode, attrs->ia_secdata,
- attrs->ia_secdata_len);
- }
+ set_inode_attr(inode, attrs);
if (kernfs_type(kn) == KERNFS_DIR)
set_nlink(inode, kn->dir.subdirs + 2);
@@ -220,7 +203,7 @@
inode->i_private = kn;
inode->i_mapping->a_ops = &kernfs_aops;
inode->i_op = &kernfs_iops;
- inode->i_generation = kn->id.generation;
+ inode->i_generation = kernfs_gen(kn);
set_default_inode_attr(inode, kn->mode);
kernfs_refresh_inode(kn, inode);
@@ -266,7 +249,7 @@
{
struct inode *inode;
- inode = iget_locked(sb, kn->id.ino);
+ inode = iget_locked(sb, kernfs_ino(kn));
if (inode && (inode->i_state & I_NEW))
kernfs_init_inode(kn, inode);
@@ -305,82 +288,149 @@
return generic_permission(inode, mask);
}
-static int kernfs_xattr_get(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *suffix, void *value, size_t size)
+int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
+ void *value, size_t size)
{
- const char *name = xattr_full_name(handler, suffix);
- struct kernfs_node *kn = inode->i_private;
- struct kernfs_iattrs *attrs;
-
- attrs = kernfs_iattrs(kn);
+ struct kernfs_iattrs *attrs = kernfs_iattrs_noalloc(kn);
if (!attrs)
- return -ENOMEM;
+ return -ENODATA;
return simple_xattr_get(&attrs->xattrs, name, value, size);
}
-static int kernfs_xattr_set(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *suffix, const void *value,
- size_t size, int flags)
+int kernfs_xattr_set(struct kernfs_node *kn, const char *name,
+ const void *value, size_t size, int flags)
{
- const char *name = xattr_full_name(handler, suffix);
- struct kernfs_node *kn = inode->i_private;
- struct kernfs_iattrs *attrs;
-
- attrs = kernfs_iattrs(kn);
+ struct kernfs_iattrs *attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
- return simple_xattr_set(&attrs->xattrs, name, value, size, flags);
+ return simple_xattr_set(&attrs->xattrs, name, value, size, flags, NULL);
}
-static const struct xattr_handler kernfs_trusted_xattr_handler = {
- .prefix = XATTR_TRUSTED_PREFIX,
- .get = kernfs_xattr_get,
- .set = kernfs_xattr_set,
-};
+static int kernfs_vfs_xattr_get(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *suffix, void *value, size_t size,
+ int flags)
+{
+ const char *name = xattr_full_name(handler, suffix);
+ struct kernfs_node *kn = inode->i_private;
-static int kernfs_security_xattr_set(const struct xattr_handler *handler,
+ return kernfs_xattr_get(kn, name, value, size);
+}
+
+static int kernfs_vfs_xattr_set(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *suffix, const void *value,
+ size_t size, int flags)
+{
+ const char *name = xattr_full_name(handler, suffix);
+ struct kernfs_node *kn = inode->i_private;
+
+ return kernfs_xattr_set(kn, name, value, size, flags);
+}
+
+static int kernfs_vfs_user_xattr_add(struct kernfs_node *kn,
+ const char *full_name,
+ struct simple_xattrs *xattrs,
+ const void *value, size_t size, int flags)
+{
+ atomic_t *sz = &kn->iattr->user_xattr_size;
+ atomic_t *nr = &kn->iattr->nr_user_xattrs;
+ ssize_t removed_size;
+ int ret;
+
+ if (atomic_inc_return(nr) > KERNFS_MAX_USER_XATTRS) {
+ ret = -ENOSPC;
+ goto dec_count_out;
+ }
+
+ if (atomic_add_return(size, sz) > KERNFS_USER_XATTR_SIZE_LIMIT) {
+ ret = -ENOSPC;
+ goto dec_size_out;
+ }
+
+ ret = simple_xattr_set(xattrs, full_name, value, size, flags,
+ &removed_size);
+
+ if (!ret && removed_size >= 0)
+ size = removed_size;
+ else if (!ret)
+ return 0;
+dec_size_out:
+ atomic_sub(size, sz);
+dec_count_out:
+ atomic_dec(nr);
+ return ret;
+}
+
+static int kernfs_vfs_user_xattr_rm(struct kernfs_node *kn,
+ const char *full_name,
+ struct simple_xattrs *xattrs,
+ const void *value, size_t size, int flags)
+{
+ atomic_t *sz = &kn->iattr->user_xattr_size;
+ atomic_t *nr = &kn->iattr->nr_user_xattrs;
+ ssize_t removed_size;
+ int ret;
+
+ ret = simple_xattr_set(xattrs, full_name, value, size, flags,
+ &removed_size);
+
+ if (removed_size >= 0) {
+ atomic_sub(removed_size, sz);
+ atomic_dec(nr);
+ }
+
+ return ret;
+}
+
+static int kernfs_vfs_user_xattr_set(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *suffix, const void *value,
size_t size, int flags)
{
+ const char *full_name = xattr_full_name(handler, suffix);
struct kernfs_node *kn = inode->i_private;
struct kernfs_iattrs *attrs;
- void *secdata;
- u32 secdata_len = 0;
- int error;
+
+ if (!(kernfs_root(kn)->flags & KERNFS_ROOT_SUPPORT_USER_XATTR))
+ return -EOPNOTSUPP;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
- error = security_inode_setsecurity(inode, suffix, value, size, flags);
- if (error)
- return error;
- error = security_inode_getsecctx(inode, &secdata, &secdata_len);
- if (error)
- return error;
+ if (value)
+ return kernfs_vfs_user_xattr_add(kn, full_name, &attrs->xattrs,
+ value, size, flags);
+ else
+ return kernfs_vfs_user_xattr_rm(kn, full_name, &attrs->xattrs,
+ value, size, flags);
- mutex_lock(&kernfs_mutex);
- error = kernfs_node_setsecdata(attrs, &secdata, &secdata_len);
- mutex_unlock(&kernfs_mutex);
-
- if (secdata)
- security_release_secctx(secdata, secdata_len);
- return error;
}
+
+static const struct xattr_handler kernfs_trusted_xattr_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .get = kernfs_vfs_xattr_get,
+ .set = kernfs_vfs_xattr_set,
+};
static const struct xattr_handler kernfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
- .get = kernfs_xattr_get,
- .set = kernfs_security_xattr_set,
+ .get = kernfs_vfs_xattr_get,
+ .set = kernfs_vfs_xattr_set,
+};
+
+static const struct xattr_handler kernfs_user_xattr_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .get = kernfs_vfs_xattr_get,
+ .set = kernfs_vfs_user_xattr_set,
};
const struct xattr_handler *kernfs_xattr_handlers[] = {
&kernfs_trusted_xattr_handler,
&kernfs_security_xattr_handler,
+ &kernfs_user_xattr_handler,
NULL
};
--
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