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Date: Fri, 7 Apr 2023 15:23:03 +0800
From: Yangtao Li <frank.li@...o.com>
To: gregkh@...uxfoundation.org, xiang@...nel.org,
Chao Yu <chao@...nel.org>, Yue Hu <huyue2@...lpad.com>,
Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc: damien.lemoal@...nsource.wdc.com, frank.li@...o.com,
jth@...nel.org, linux-erofs@...ts.ozlabs.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
naohiro.aota@....com, rafael@...nel.org
Subject: Re: [PATCH 2/3] erofs: convert to use kobject_is_added()
Hi all,
> Later, I thought I could send some demo code that strips the kobject in sbi into a pointer.
I made the following modifications, not sure if I'm going the right way.
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 1db018f8c2e8..8e1799f690c0 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -165,8 +165,7 @@ struct erofs_sb_info {
u32 feature_incompat;
/* sysfs support */
- struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
- struct completion s_kobj_unregister;
+ struct filesystem_kobject *f_kobj;
/* fscache support */
struct fscache_volume *volume;
diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c
index 435e515c0792..70e915906012 100644
--- a/fs/erofs/sysfs.c
+++ b/fs/erofs/sysfs.c
@@ -8,6 +8,33 @@
#include "internal.h"
+//maybe we should add following thins to include/linux/filesystem_kobject.h ?
+struct filesystem_kobject {
+ struct kobject kobject;
+ void *private;
+};
+
+void filesystem_kobject_put(struct filesystem_kobject *f_kobj)
+{
+ if (f_kobj)
+ kobject_put(&f_kobj->kobject);
+}
+
+void filesystem_kobject_set_private(struct filesystem_kobject *f_kobj, void *p)
+{
+ f_kobj->private = p;
+}
+
+void *filesystem_kobject_get_private(struct filesystem_kobject *f_kobj)
+{
+ return f_kobj->private;
+}
+
+struct kobject *filesystem_kobject_get_kobject(struct filesystem_kobject *f_kobj)
+{
+ return &f_kobj->kobject;
+}
+
enum {
attr_feature,
attr_pointer_ui,
@@ -107,8 +134,9 @@ static unsigned char *__struct_ptr(struct erofs_sb_info *sbi,
static ssize_t erofs_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
- struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
- s_kobj);
+ struct filesystem_kobject *f_kobject = container_of(kobj, struct filesystem_kobject,
+ kobject);
+ struct erofs_sb_info *sbi = filesystem_kobject_get_private(f_kobject);
struct erofs_attr *a = container_of(attr, struct erofs_attr, attr);
unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset);
@@ -130,8 +158,9 @@ static ssize_t erofs_attr_show(struct kobject *kobj,
static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t len)
{
- struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
- s_kobj);
+ struct filesystem_kobject *f_kobject = container_of(kobj, struct filesystem_kobject,
+ kobject);
+ struct erofs_sb_info *sbi = filesystem_kobject_get_private(f_kobject);
struct erofs_attr *a = container_of(attr, struct erofs_attr, attr);
unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset);
unsigned long t;
@@ -169,9 +198,12 @@ static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
static void erofs_sb_release(struct kobject *kobj)
{
- struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
- s_kobj);
- complete(&sbi->s_kobj_unregister);
+ struct filesystem_kobject *f_kobject = container_of(kobj, struct filesystem_kobject,
+ kobject);
+ struct erofs_sb_info *sbi = filesystem_kobject_get_private(f_kobject);
+
+ kfree(f_kobject);
+ sbi->f_kobj = NULL;
}
static const struct sysfs_ops erofs_attr_ops = {
@@ -205,6 +237,7 @@ static struct kobject erofs_feat = {
int erofs_register_sysfs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct kobject *kobj;
char *name;
char *str = NULL;
int err;
@@ -222,17 +255,24 @@ int erofs_register_sysfs(struct super_block *sb)
} else {
name = sb->s_id;
}
- sbi->s_kobj.kset = &erofs_root;
- init_completion(&sbi->s_kobj_unregister);
- err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s", name);
+
+ sbi->f_kobj = kzalloc(sizeof(struct filesystem_kobject), GFP_KERNEL);
+ if (!sbi->f_kobj) {
+ kfree(str);
+ return -ENOMEM;
+ }
+ filesystem_kobject_set_private(sbi->f_kobj, sbi);
+ kobj = filesystem_kobject_get_kobject(sbi->f_kobj);
+ kobj->kset = &erofs_root;
+
+ err = kobject_init_and_add(&sbi->f_kobj->kobject, &erofs_sb_ktype, NULL, "%s", name);
kfree(str);
if (err)
goto put_sb_kobj;
return 0;
put_sb_kobj:
- kobject_put(&sbi->s_kobj);
- wait_for_completion(&sbi->s_kobj_unregister);
+ filesystem_kobject_put(sbi->f_kobj);
return err;
}
@@ -240,11 +280,7 @@ void erofs_unregister_sysfs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
- if (sbi->s_kobj.state_in_sysfs) {
- kobject_del(&sbi->s_kobj);
- kobject_put(&sbi->s_kobj);
- wait_for_completion(&sbi->s_kobj_unregister);
- }
+ filesystem_kobject_put(sbi->f_kobj);
}
int __init erofs_init_sysfs(void)
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