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f2fs: introduce a new per-sb directory in sysfs

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Add a new directory 'stat' in path of /sys/fs/f2fs/<devname>/, later
we can add new readonly stat sysfs file into this directory, it will
make <devname> directory less mess.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-12-09 16:43:27 +08:00 committed by Jaegeuk Kim
parent 3fde13f817
commit 5d4daa579e
2 changed files with 68 additions and 6 deletions
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5
fs/f2fs/f2fs.h
View File

@ -1545,9 +1545,12 @@ struct f2fs_sb_info {
unsigned int node_io_flag;
/* For sysfs suppport */
struct kobject s_kobj;
struct kobject s_kobj; /* /sys/fs/f2fs/<devname> */
struct completion s_kobj_unregister;
struct kobject s_stat_kobj; /* /sys/fs/f2fs/<devname>/stat */
struct completion s_stat_kobj_unregister;
/* For shrinker support */
struct list_head s_list;
int s_ndevs; /* number of devices */

69
fs/f2fs/sysfs.c
View File

@ -702,6 +702,11 @@ static struct attribute *f2fs_feat_attrs[] = {
};
ATTRIBUTE_GROUPS(f2fs_feat);
static struct attribute *f2fs_stat_attrs[] = {
NULL,
};
ATTRIBUTE_GROUPS(f2fs_stat);
static const struct sysfs_ops f2fs_attr_ops = {
.show = f2fs_attr_show,
.store = f2fs_attr_store,
@ -730,6 +735,44 @@ static struct kobject f2fs_feat = {
.kset = &f2fs_kset,
};
static ssize_t f2fs_stat_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
s_stat_kobj);
struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
return a->show ? a->show(a, sbi, buf) : 0;
}
static ssize_t f2fs_stat_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t len)
{
struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
s_stat_kobj);
struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
return a->store ? a->store(a, sbi, buf, len) : 0;
}
static void f2fs_stat_kobj_release(struct kobject *kobj)
{
struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
s_stat_kobj);
complete(&sbi->s_stat_kobj_unregister);
}
static const struct sysfs_ops f2fs_stat_attr_ops = {
.show = f2fs_stat_attr_show,
.store = f2fs_stat_attr_store,
};
static struct kobj_type f2fs_stat_ktype = {
.default_groups = f2fs_stat_groups,
.sysfs_ops = &f2fs_stat_attr_ops,
.release = f2fs_stat_kobj_release,
};
static int __maybe_unused segment_info_seq_show(struct seq_file *seq,
void *offset)
{
@ -936,11 +979,15 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
init_completion(&sbi->s_kobj_unregister);
err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
"%s", sb->s_id);
if (err) {
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
return err;
}
if (err)
goto put_sb_kobj;
sbi->s_stat_kobj.kset = &f2fs_kset;
init_completion(&sbi->s_stat_kobj_unregister);
err = kobject_init_and_add(&sbi->s_stat_kobj, &f2fs_stat_ktype,
&sbi->s_kobj, "stat");
if (err)
goto put_stat_kobj;
if (f2fs_proc_root)
sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
@ -956,6 +1003,13 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
victim_bits_seq_show, sb);
}
return 0;
put_stat_kobj:
kobject_put(&sbi->s_stat_kobj);
wait_for_completion(&sbi->s_stat_kobj_unregister);
put_sb_kobj:
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
return err;
}
void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
@ -967,6 +1021,11 @@ void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
remove_proc_entry("victim_bits", sbi->s_proc);
remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
}
kobject_del(&sbi->s_stat_kobj);
kobject_put(&sbi->s_stat_kobj);
wait_for_completion(&sbi->s_stat_kobj_unregister);
kobject_del(&sbi->s_kobj);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);