1 files changed, 123 insertions, 0 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 70dbb313a7ca..e161a24fbf39 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -23,17 +23,21 @@
 #include <linux/exportfs.h>
 #include <linux/blkdev.h>
 #include <linux/f2fs_fs.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
 
 #include "f2fs.h"
 #include "node.h"
 #include "segment.h"
 #include "xattr.h"
+#include "gc.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/f2fs.h>
 
 static struct proc_dir_entry *f2fs_proc_root;
 static struct kmem_cache *f2fs_inode_cachep;
+static struct kset *f2fs_kset;
 
 enum {
         Opt_gc_background,
@@ -59,6 +63,111 @@ static match_table_t f2fs_tokens = {
         {Opt_err, NULL},
 };
 
+/* Sysfs support for f2fs */
+struct f2fs_attr {
+        struct attribute attr;
+        ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
+        ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
+                         const char *, size_t);
+        int offset;
+};
+
+static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
+                        struct f2fs_sb_info *sbi, char *buf)
+{
+        struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
+        unsigned int *ui;
+
+        if (!gc_kth)
+                return -EINVAL;
+
+        ui = (unsigned int *)(((char *)gc_kth) + a->offset);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
+static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
+                        struct f2fs_sb_info *sbi,
+                        const char *buf, size_t count)
+{
+        struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
+        unsigned long t;
+        unsigned int *ui;
+        ssize_t ret;
+
+        if (!gc_kth)
+                return -EINVAL;
+
+        ui = (unsigned int *)(((char *)gc_kth) + a->offset);
+
+        ret = kstrtoul(skip_spaces(buf), 0, &t);
+        if (ret < 0)
+                return ret;
+        *ui = t;
+        return count;
+}
+
+static ssize_t f2fs_attr_show(struct kobject *kobj,
+                                struct attribute *attr, char *buf)
+{
+        struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+                                                                s_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_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_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_sb_release(struct kobject *kobj)
+{
+        struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+                                                                s_kobj);
+        complete(&sbi->s_kobj_unregister);
+}
+
+#define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \
+static struct f2fs_attr f2fs_attr_##_name = {                   \
+        .attr = {.name = __stringify(_name), .mode = _mode },   \
+        .show   = _show,                                        \
+        .store  = _store,                                       \
+        .offset = offsetof(struct f2fs_gc_kthread, _elname),    \
+}
+
+#define F2FS_RW_ATTR(name, elname)      \
+        F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname)
+
+F2FS_RW_ATTR(gc_min_sleep_time, min_sleep_time);
+F2FS_RW_ATTR(gc_max_sleep_time, max_sleep_time);
+F2FS_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
+
+#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
+static struct attribute *f2fs_attrs[] = {
+        ATTR_LIST(gc_min_sleep_time),
+        ATTR_LIST(gc_max_sleep_time),
+        ATTR_LIST(gc_no_gc_sleep_time),
+        NULL,
+};
+
+static const struct sysfs_ops f2fs_attr_ops = {
+        .show   = f2fs_attr_show,
+        .store  = f2fs_attr_store,
+};
+
+static struct kobj_type f2fs_ktype = {
+        .default_attrs  = f2fs_attrs,
+        .sysfs_ops      = &f2fs_attr_ops,
+        .release        = f2fs_sb_release,
+};
+
 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 {
         struct va_format vaf;
@@ -229,6 +338,7 @@ static void f2fs_put_super(struct super_block *sb)
                 remove_proc_entry("segment_info", sbi->s_proc);
                 remove_proc_entry(sb->s_id, f2fs_proc_root);
         }
+        kobject_del(&sbi->s_kobj);
 
         f2fs_destroy_stats(sbi);
         stop_gc_thread(sbi);
@@ -243,6 +353,8 @@ static void f2fs_put_super(struct super_block *sb)
         destroy_segment_manager(sbi);
 
         kfree(sbi->ckpt);
+        kobject_put(&sbi->s_kobj);
+        wait_for_completion(&sbi->s_kobj_unregister);
 
         sb->s_fs_info = NULL;
         brelse(sbi->raw_super_buf);
@@ -818,6 +930,13 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
                                         "the device does not support discard");
         }
 
+        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 fail;
+
         return 0;
 fail:
         stop_gc_thread(sbi);
@@ -892,6 +1011,9 @@ static int __init init_f2fs_fs(void)
         err = create_checkpoint_caches();
         if (err)
                 goto fail;
+        f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
+        if (!f2fs_kset)
+                goto fail;
         err = register_filesystem(&f2fs_fs_type);
         if (err)
                 goto fail;
@@ -910,6 +1032,7 @@ static void __exit exit_f2fs_fs(void)
         destroy_gc_caches();
         destroy_node_manager_caches();
         destroy_inodecache();
+        kset_unregister(f2fs_kset);
 }
 
 module_init(init_f2fs_fs)