1 files changed, 110 insertions, 0 deletions

diff --git a/drivers/md/bcache/sysfs.h b/drivers/md/bcache/sysfs.h
new file mode 100644
index 000000000000..0526fe92a683
--- /dev/null
+++ b/drivers/md/bcache/sysfs.h
@@ -0,0 +1,110 @@
+#ifndef _BCACHE_SYSFS_H_
+#define _BCACHE_SYSFS_H_
+
+#define KTYPE(type)                                                     \
+struct kobj_type type ## _ktype = {                                     \
+        .release        = type ## _release,                             \
+        .sysfs_ops      = &((const struct sysfs_ops) {                  \
+                .show   = type ## _show,                                \
+                .store  = type ## _store                                \
+        }),                                                             \
+        .default_attrs  = type ## _files                                \
+}
+
+#define SHOW(fn)                                                        \
+static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
+                           char *buf)                                   \
+
+#define STORE(fn)                                                       \
+static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
+                            const char *buf, size_t size)               \
+
+#define SHOW_LOCKED(fn)                                                 \
+SHOW(fn)                                                                \
+{                                                                       \
+        ssize_t ret;                                                    \
+        mutex_lock(&bch_register_lock);                                 \
+        ret = __ ## fn ## _show(kobj, attr, buf);                       \
+        mutex_unlock(&bch_register_lock);                               \
+        return ret;                                                     \
+}
+
+#define STORE_LOCKED(fn)                                                \
+STORE(fn)                                                               \
+{                                                                       \
+        ssize_t ret;                                                    \
+        mutex_lock(&bch_register_lock);                                 \
+        ret = __ ## fn ## _store(kobj, attr, buf, size);                \
+        mutex_unlock(&bch_register_lock);                               \
+        return ret;                                                     \
+}
+
+#define __sysfs_attribute(_name, _mode)                                 \
+        static struct attribute sysfs_##_name =                         \
+                { .name = #_name, .mode = _mode }
+
+#define write_attribute(n)      __sysfs_attribute(n, S_IWUSR)
+#define read_attribute(n)       __sysfs_attribute(n, S_IRUGO)
+#define rw_attribute(n)         __sysfs_attribute(n, S_IRUGO|S_IWUSR)
+
+#define sysfs_printf(file, fmt, ...)                                    \
+do {                                                                    \
+        if (attr == &sysfs_ ## file)                                    \
+                return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \
+} while (0)
+
+#define sysfs_print(file, var)                                          \
+do {                                                                    \
+        if (attr == &sysfs_ ## file)                                    \
+                return snprint(buf, PAGE_SIZE, var);                    \
+} while (0)
+
+#define sysfs_hprint(file, val)                                         \
+do {                                                                    \
+        if (attr == &sysfs_ ## file) {                                  \
+                ssize_t ret = bch_hprint(buf, val);                     \
+                strcat(buf, "\n");                                      \
+                return ret + 1;                                         \
+        }                                                               \
+} while (0)
+
+#define var_printf(_var, fmt)   sysfs_printf(_var, fmt, var(_var))
+#define var_print(_var)         sysfs_print(_var, var(_var))
+#define var_hprint(_var)        sysfs_hprint(_var, var(_var))
+
+#define sysfs_strtoul(file, var)                                        \
+do {                                                                    \
+        if (attr == &sysfs_ ## file)                                    \
+                return strtoul_safe(buf, var) ?: (ssize_t) size;        \
+} while (0)
+
+#define sysfs_strtoul_clamp(file, var, min, max)                        \
+do {                                                                    \
+        if (attr == &sysfs_ ## file)                                    \
+                return strtoul_safe_clamp(buf, var, min, max)           \
+                        ?: (ssize_t) size;                              \
+} while (0)
+
+#define strtoul_or_return(cp)                                           \
+({                                                                      \
+        unsigned long _v;                                               \
+        int _r = kstrtoul(cp, 10, &_v);                                 \
+        if (_r)                                                         \
+                return _r;                                              \
+        _v;                                                             \
+})
+
+#define strtoi_h_or_return(cp, v)                                       \
+do {                                                                    \
+        int _r = strtoi_h(cp, &v);                                      \
+        if (_r)                                                         \
+                return _r;                                              \
+} while (0)
+
+#define sysfs_hatoi(file, var)                                          \
+do {                                                                    \
+        if (attr == &sysfs_ ## file)                                    \
+                return strtoi_h(buf, &var) ?: (ssize_t) size;           \
+} while (0)
+
+#endif  /* _BCACHE_SYSFS_H_ */