f2fs: use crc and cp version to determine roll-forward recovery
Previously, we used cp_version only to detect recoverable dnodes.
In order to avoid same garbage cp_version, we needed to truncate the next
dnode during checkpoint, resulting in additional discard or data write.
If we can distinguish this by using crc in addition to cp_version, we can
remove this overhead.
There is backward compatibility concern where it changes node_footer layout.
So, this patch introduces a new checkpoint flag, CP_CRC_RECOVERY_FLAG, to
detect new layout. New layout will be activated only when this flag is set.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index ad748e5..2b8a56d 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -224,7 +224,6 @@
static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
{
- unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
struct curseg_info *curseg;
struct page *page = NULL;
block_t blkaddr;
@@ -242,7 +241,7 @@
page = get_tmp_page(sbi, blkaddr);
- if (cp_ver != cpver_of_node(page))
+ if (!is_recoverable_dnode(page))
break;
if (!is_fsync_dnode(page))
@@ -516,7 +515,6 @@
static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
struct list_head *dir_list)
{
- unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
struct curseg_info *curseg;
struct page *page = NULL;
int err = 0;
@@ -536,7 +534,7 @@
page = get_tmp_page(sbi, blkaddr);
- if (cp_ver != cpver_of_node(page)) {
+ if (!is_recoverable_dnode(page)) {
f2fs_put_page(page, 1);
break;
}
@@ -628,37 +626,15 @@
}
clear_sbi_flag(sbi, SBI_POR_DOING);
- if (err) {
- bool invalidate = false;
-
- if (test_opt(sbi, LFS)) {
- update_meta_page(sbi, NULL, blkaddr);
- invalidate = true;
- } else if (discard_next_dnode(sbi, blkaddr)) {
- invalidate = true;
- }
-
- f2fs_wait_all_discard_bio(sbi);
-
- /* Flush all the NAT/SIT pages */
- while (get_pages(sbi, F2FS_DIRTY_META))
- sync_meta_pages(sbi, META, LONG_MAX);
-
- /* invalidate temporary meta page */
- if (invalidate)
- invalidate_mapping_pages(META_MAPPING(sbi),
- blkaddr, blkaddr);
-
+ if (err)
set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
- mutex_unlock(&sbi->cp_mutex);
- } else if (need_writecp) {
+ mutex_unlock(&sbi->cp_mutex);
+
+ if (!err && need_writecp) {
struct cp_control cpc = {
.reason = CP_RECOVERY,
};
- mutex_unlock(&sbi->cp_mutex);
err = write_checkpoint(sbi, &cpc);
- } else {
- mutex_unlock(&sbi->cp_mutex);
}
destroy_fsync_dnodes(&dir_list);