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Subject[PATCH 1/2] f2fs: expose /sys/fs/f2fs/features
Date
This patch exposes what features are supported by current f2fs build to sysfs
entry.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/f2fs.h | 6 +++
fs/f2fs/file.c | 3 +-
fs/f2fs/sysfs.c | 114 +++++++++++++++++++++++++++++++++++++++++++-------------
3 files changed, 96 insertions(+), 27 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1833eefe47b3..a336021b777f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2864,6 +2864,12 @@ static inline int f2fs_sb_has_project_quota(struct super_block *sb)
return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_PRJQUOTA);
}

+static inline int f2fs_sb_support_atomic_write(void)
+{
+ /* Validated with sqlite */
+ return 1;
+}
+
#ifdef CONFIG_BLK_DEV_ZONED
static inline int get_blkz_type(struct f2fs_sb_info *sbi,
struct block_device *bdev, block_t blkaddr)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index e4a45f02cd4e..0f4dbeb61845 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2384,7 +2384,8 @@ static int f2fs_ioc_get_features(struct file *filp, unsigned long arg)
u32 sb_feature = le32_to_cpu(F2FS_I_SB(inode)->raw_super->feature);

/* Must validate to set it with SQLite behavior in Android. */
- sb_feature |= F2FS_FEATURE_ATOMIC_WRITE;
+ if (f2fs_sb_support_atomic_write())
+ sb_feature |= F2FS_FEATURE_ATOMIC_WRITE;

return put_user(sb_feature, (u32 __user *)arg);
}
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 71191d89917d..0bd57e8769c6 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -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 {
@@ -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)
@@ -155,6 +155,24 @@ static void f2fs_sb_release(struct kobject *kobj)
complete(&sbi->s_kobj_unregister);
}

+enum feat_id {
+ FEAT_CRYPTO = 0,
+ FEAT_BLKZONED,
+ FEAT_ATOMIC_WRITE,
+};
+
+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:
+ 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 }, \
@@ -172,6 +190,13 @@ 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);
@@ -197,6 +222,14 @@ F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
#endif
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);

+#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);
+
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
ATTR_LIST(gc_min_sleep_time),
@@ -226,17 +259,45 @@ static struct attribute *f2fs_attrs[] = {
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),
+ 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;
@@ -306,18 +367,29 @@ F2FS_PROC_FILE_DEF(segment_bits);

int __init f2fs_register_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_unregister_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_init_sysfs(struct f2fs_sb_info *sbi)
@@ -325,6 +397,13 @@ int f2fs_init_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);

@@ -334,32 +413,15 @@ int f2fs_init_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_exit_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);
}
--
2.13.0.rc1.294.g07d810a77f-goog
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