f2fs: introduce lifetime write IO statistics
This patch introduces lifetime IO write statistics exposed to the sysfs interface.
The write IO amount is obtained from block layer, accumulated in the file system and
stored in the hot node summary of checkpoint.
Signed-off-by: Shuoran Liu <liushuoran@huawei.com>
Signed-off-by: Pengyang Hou <houpengyang@huawei.com>
[Jaegeuk Kim: add sysfs documentation]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 0ea5bcc..58d9a55 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -126,6 +126,19 @@
return NULL;
}
+static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ struct super_block *sb = sbi->sb;
+
+ if (!sb->s_bdev->bd_part)
+ return snprintf(buf, PAGE_SIZE, "0\n");
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long)(sbi->kbytes_written +
+ BD_PART_WRITTEN(sbi)));
+}
+
static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
@@ -204,6 +217,9 @@
f2fs_sbi_show, f2fs_sbi_store, \
offsetof(struct struct_name, elname))
+#define F2FS_GENERAL_RO_ATTR(name) \
+static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
+
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);
@@ -221,6 +237,7 @@
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
+F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -241,6 +258,7 @@
ATTR_LIST(dirty_nats_ratio),
ATTR_LIST(cp_interval),
ATTR_LIST(idle_interval),
+ ATTR_LIST(lifetime_write_kbytes),
NULL,
};
@@ -768,8 +786,6 @@
bool need_stop_gc = false;
bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
- sync_filesystem(sb);
-
/*
* Save the old mount options in case we
* need to restore them.
@@ -777,6 +793,13 @@
org_mount_opt = sbi->mount_opt;
active_logs = sbi->active_logs;
+ if (*flags & MS_RDONLY) {
+ set_opt(sbi, FASTBOOT);
+ set_sbi_flag(sbi, SBI_IS_DIRTY);
+ }
+
+ sync_filesystem(sb);
+
sbi->mount_opt.opt = 0;
default_options(sbi);
@@ -1244,6 +1267,7 @@
bool retry = true, need_fsck = false;
char *options = NULL;
int recovery, i, valid_super_block;
+ struct curseg_info *seg_i;
try_onemore:
err = -EINVAL;
@@ -1374,6 +1398,17 @@
goto free_nm;
}
+ /* For write statistics */
+ if (sb->s_bdev->bd_part)
+ sbi->sectors_written_start =
+ (u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);
+
+ /* Read accumulated write IO statistics if exists */
+ seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
+ if (__exist_node_summaries(sbi))
+ sbi->kbytes_written =
+ le64_to_cpu(seg_i->sum_blk->info.kbytes_written);
+
build_gc_manager(sbi);
/* get an inode for node space */