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f2fs: expose features to sysfs entry
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This patch exposes what features are supported by current f2fs build to sysfs
entry via:

/sys/fs/f2fs/features/
/sys/fs/f2fs/dev/features

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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Jaegeuk Kim committed Aug 4, 2017
1 parent 704956e commit bf9e697
Showing 1 changed file with 130 additions and 26 deletions.
156 changes: 130 additions & 26 deletions fs/f2fs/sysfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,6 @@
#include "gc.h"

static struct proc_dir_entry *f2fs_proc_root;
static struct kset *f2fs_kset;

/* Sysfs support for f2fs */
enum {
Expand All @@ -41,6 +40,7 @@ struct f2fs_attr {
const char *, size_t);
int struct_type;
int offset;
int id;
};

static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
Expand Down Expand Up @@ -76,6 +76,34 @@ static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
BD_PART_WRITTEN(sbi)));
}

static ssize_t features_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
struct super_block *sb = sbi->sb;
int len = 0;

if (!sb->s_bdev->bd_part)
return snprintf(buf, PAGE_SIZE, "0\n");

if (f2fs_sb_has_crypto(sb))
len += snprintf(buf, PAGE_SIZE - len, "%s",
"encryption");
if (f2fs_sb_mounted_blkzoned(sb))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "blkzoned");
if (f2fs_sb_has_extra_attr(sb))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "extra_attr");
if (f2fs_sb_has_project_quota(sb))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "projquota");
if (f2fs_sb_has_inode_chksum(sb))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "inode_checksum");
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
return len;
}

static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
Expand Down Expand Up @@ -155,6 +183,30 @@ static void f2fs_sb_release(struct kobject *kobj)
complete(&sbi->s_kobj_unregister);
}

enum feat_id {
FEAT_CRYPTO = 0,
FEAT_BLKZONED,
FEAT_ATOMIC_WRITE,
FEAT_EXTRA_ATTR,
FEAT_PROJECT_QUOTA,
FEAT_INODE_CHECKSUM,
};

static ssize_t f2fs_feature_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
switch (a->id) {
case FEAT_CRYPTO:
case FEAT_BLKZONED:
case FEAT_ATOMIC_WRITE:
case FEAT_EXTRA_ATTR:
case FEAT_PROJECT_QUOTA:
case FEAT_INODE_CHECKSUM:
return snprintf(buf, PAGE_SIZE, "supported\n");
}
return 0;
}

#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
static struct f2fs_attr f2fs_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
Expand All @@ -172,6 +224,13 @@ static struct f2fs_attr f2fs_attr_##_name = { \
#define F2FS_GENERAL_RO_ATTR(name) \
static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)

#define F2FS_FEATURE_RO_ATTR(_name, _id) \
static struct f2fs_attr f2fs_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = 0444 }, \
.show = f2fs_feature_show, \
.id = _id, \
}

F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
Expand All @@ -196,6 +255,18 @@ F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
#endif
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
F2FS_GENERAL_RO_ATTR(features);

#ifdef CONFIG_F2FS_FS_ENCRYPTION
F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
#endif
#ifdef CONFIG_BLK_DEV_ZONED
F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
#endif
F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);

#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
Expand All @@ -222,21 +293,53 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(inject_type),
#endif
ATTR_LIST(lifetime_write_kbytes),
ATTR_LIST(features),
ATTR_LIST(reserved_blocks),
NULL,
};

static struct attribute *f2fs_feat_attrs[] = {
#ifdef CONFIG_F2FS_FS_ENCRYPTION
ATTR_LIST(encryption),
#endif
#ifdef CONFIG_BLK_DEV_ZONED
ATTR_LIST(block_zoned),
#endif
ATTR_LIST(atomic_write),
ATTR_LIST(extra_attr),
ATTR_LIST(project_quota),
ATTR_LIST(inode_checksum),
NULL,
};

static const struct sysfs_ops f2fs_attr_ops = {
.show = f2fs_attr_show,
.store = f2fs_attr_store,
};

static struct kobj_type f2fs_ktype = {
static struct kobj_type f2fs_sb_ktype = {
.default_attrs = f2fs_attrs,
.sysfs_ops = &f2fs_attr_ops,
.release = f2fs_sb_release,
};

static struct kobj_type f2fs_ktype = {
.sysfs_ops = &f2fs_attr_ops,
};

static struct kset f2fs_kset = {
.kobj = {.ktype = &f2fs_ktype},
};

static struct kobj_type f2fs_feat_ktype = {
.default_attrs = f2fs_feat_attrs,
.sysfs_ops = &f2fs_attr_ops,
};

static struct kobject f2fs_feat = {
.kset = &f2fs_kset,
};

static int segment_info_seq_show(struct seq_file *seq, void *offset)
{
struct super_block *sb = seq->private;
Expand Down Expand Up @@ -306,25 +409,43 @@ F2FS_PROC_FILE_DEF(segment_bits);

int __init f2fs_init_sysfs(void)
{
f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
int ret;

f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
if (!f2fs_kset)
return -ENOMEM;
return 0;
kobject_set_name(&f2fs_kset.kobj, "f2fs");
f2fs_kset.kobj.parent = fs_kobj;
ret = kset_register(&f2fs_kset);
if (ret)
return ret;

ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
NULL, "features");
if (ret)
kset_unregister(&f2fs_kset);
else
f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
return ret;
}

void f2fs_exit_sysfs(void)
{
kset_unregister(f2fs_kset);
kobject_put(&f2fs_feat);
kset_unregister(&f2fs_kset);
remove_proc_entry("fs/f2fs", NULL);
f2fs_proc_root = NULL;
}

int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
{
struct super_block *sb = sbi->sb;
int err;

sbi->s_kobj.kset = &f2fs_kset;
init_completion(&sbi->s_kobj_unregister);
err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
"%s", sb->s_id);
if (err)
return err;

if (f2fs_proc_root)
sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

Expand All @@ -334,32 +455,15 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
&f2fs_seq_segment_bits_fops, sb);
}

sbi->s_kobj.kset = f2fs_kset;
init_completion(&sbi->s_kobj_unregister);
err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
"%s", sb->s_id);
if (err)
goto err_out;
return 0;
err_out:
if (sbi->s_proc) {
remove_proc_entry("segment_info", sbi->s_proc);
remove_proc_entry("segment_bits", sbi->s_proc);
remove_proc_entry(sb->s_id, f2fs_proc_root);
}
return err;
}

void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
{
kobject_del(&sbi->s_kobj);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);

if (sbi->s_proc) {
remove_proc_entry("segment_info", sbi->s_proc);
remove_proc_entry("segment_bits", sbi->s_proc);
remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
}
kobject_del(&sbi->s_kobj);
}

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