count; \
})
+#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
+static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
+ struct attribute *attr, char *buf) \
+{ \
+ struct the_nilfs *nilfs = container_of(kobj->parent, \
+ struct the_nilfs, \
+ ns_##parent_name##_kobj); \
+ struct nilfs_##name##_attr *a = container_of(attr, \
+ struct nilfs_##name##_attr, \
+ attr); \
+ return a->show ? a->show(a, nilfs, buf) : 0; \
+} \
+static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
+ struct attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ struct the_nilfs *nilfs = container_of(kobj->parent, \
+ struct the_nilfs, \
+ ns_##parent_name##_kobj); \
+ struct nilfs_##name##_attr *a = container_of(attr, \
+ struct nilfs_##name##_attr, \
+ attr); \
+ return a->store ? a->store(a, nilfs, buf, len) : 0; \
+} \
+static const struct sysfs_ops nilfs_##name##_attr_ops = { \
+ .show = nilfs_##name##_attr_show, \
+ .store = nilfs_##name##_attr_store, \
+};
+
+#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
+static void nilfs_##name##_attr_release(struct kobject *kobj) \
+{ \
+ struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
+ struct the_nilfs *nilfs = container_of(kobj->parent, \
+ struct the_nilfs, \
+ ns_##parent_name##_kobj); \
+ subgroups = nilfs->ns_##parent_name##_subgroups; \
+ complete(&subgroups->sg_##name##_kobj_unregister); \
+} \
+static struct kobj_type nilfs_##name##_ktype = { \
+ .default_attrs = nilfs_##name##_attrs, \
+ .sysfs_ops = &nilfs_##name##_attr_ops, \
+ .release = nilfs_##name##_attr_release, \
+};
+
+#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
+int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
+{ \
+ struct kobject *parent; \
+ struct kobject *kobj; \
+ struct completion *kobj_unregister; \
+ struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
+ int err; \
+ subgroups = nilfs->ns_##parent_name##_subgroups; \
+ kobj = &subgroups->sg_##name##_kobj; \
+ kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
+ parent = &nilfs->ns_##parent_name##_kobj; \
+ kobj->kset = nilfs_kset; \
+ init_completion(kobj_unregister); \
+ err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
+ #name); \
+ if (err) \
+ return err; \
+ return 0; \
+} \
+void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
+{ \
+ kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
+}
+
+/************************************************************************
+ * NILFS superblock attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t sbwtime;
+
+ down_read(&nilfs->ns_sem);
+ sbwtime = nilfs->ns_sbwtime;
+ up_read(&nilfs->ns_sem);
+
+ return NILFS_SHOW_TIME(sbwtime, buf);
+}
+
+static ssize_t
+nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t sbwtime;
+
+ down_read(&nilfs->ns_sem);
+ sbwtime = nilfs->ns_sbwtime;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)sbwtime);
+}
+
+static ssize_t
+nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned sbwcount;
+
+ down_read(&nilfs->ns_sem);
+ sbwcount = nilfs->ns_sbwcount;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
+}
+
+static ssize_t
+nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned sb_update_freq;
+
+ down_read(&nilfs->ns_sem);
+ sb_update_freq = nilfs->ns_sb_update_freq;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
+}
+
+static ssize_t
+nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ const char *buf, size_t count)
+{
+ unsigned val;
+ int err;
+
+ err = kstrtouint(skip_spaces(buf), 0, &val);
+ if (err) {
+ printk(KERN_ERR "NILFS: unable to convert string: err=%d\n",
+ err);
+ return err;
+ }
+
+ if (val < NILFS_SB_FREQ) {
+ val = NILFS_SB_FREQ;
+ printk(KERN_WARNING "NILFS: superblock update frequency cannot be lesser than 10 seconds\n");
+ }
+
+ down_write(&nilfs->ns_sem);
+ nilfs->ns_sb_update_freq = val;
+ up_write(&nilfs->ns_sem);
+
+ return count;
+}
+
+static const char sb_readme_str[] =
+ "The superblock group contains attributes that describe\n"
+ "superblock's details.\n\n"
+ "(1) sb_write_time\n\tshow previous write time of super block "
+ "in human-readable format.\n\n"
+ "(2) sb_write_time_secs\n\tshow previous write time of super block "
+ "in seconds.\n\n"
+ "(3) sb_write_count\n\tshow write count of super block.\n\n"
+ "(4) sb_update_frequency\n"
+ "\tshow/set interval of periodical update of superblock (in seconds).\n\n"
+ "\tYou can set preferable frequency of superblock update by command:\n\n"
+ "\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
+
+static ssize_t
+nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, sb_readme_str);
+}
+
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
+NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
+NILFS_SUPERBLOCK_RO_ATTR(README);
+
+static struct attribute *nilfs_superblock_attrs[] = {
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
+ NILFS_SUPERBLOCK_ATTR_LIST(README),
+ NULL,
+};
+
+NILFS_DEV_INT_GROUP_OPS(superblock, dev);
+NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
+NILFS_DEV_INT_GROUP_FNS(superblock, dev);
+
/************************************************************************
* NILFS device attrs *
************************************************************************/
int nilfs_sysfs_create_device_group(struct super_block *sb)
{
struct the_nilfs *nilfs = sb->s_fs_info;
+ size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
int err;
+ nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
+ if (unlikely(!nilfs->ns_dev_subgroups)) {
+ err = -ENOMEM;
+ printk(KERN_ERR "NILFS: unable to allocate memory for device group\n");
+ goto failed_create_device_group;
+ }
+
nilfs->ns_dev_kobj.kset = nilfs_kset;
init_completion(&nilfs->ns_dev_kobj_unregister);
err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
"%s", sb->s_id);
if (err)
- goto failed_create_device_group;
+ goto free_dev_subgroups;
+
+ err = nilfs_sysfs_create_superblock_group(nilfs);
+ if (err)
+ goto cleanup_dev_kobject;
return 0;
+cleanup_dev_kobject:
+ kobject_del(&nilfs->ns_dev_kobj);
+
+free_dev_subgroups:
+ kfree(nilfs->ns_dev_subgroups);
+
failed_create_device_group:
return err;
}
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
+ nilfs_sysfs_delete_superblock_group(nilfs);
kobject_del(&nilfs->ns_dev_kobj);
+ kfree(nilfs->ns_dev_subgroups);
}
/************************************************************************
projects / openwrt / staging / blogic.git / commitdiff