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Date: Sat, 24 Sep 2016 08:46:54 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>,
<linux-kernel@...r.kernel.org>, <chao@...nel.org>
Subject: Re: [PATCH 2/3] f2fs: support checkpoint error injection
Hi Jaegeuk,
On 2016/9/24 7:53, Jaegeuk Kim wrote:
> Hi Chao,
>
> The basic rule is to stop every operations once CP_ERROR_FLAG is set.
> But, this patch simply breaks the rule.
> For example, f2fs_write_data_page() currently exits with mapping_set_error().
> So this patch incurs missing dentry blocks in a valid checkpoint.
Yes, that's right.
How about triggering checkpoint error in f2fs_stop_checkpoint?
>From 7bedfe9a0e97c4deead1c7cdbfc24187f5080268 Mon Sep 17 00:00:00 2001
From: Chao Yu <yuchao0@...wei.com>
Date: Fri, 23 Sep 2016 06:59:04 +0800
Subject: [PATCH] f2fs: support checkpoint error injection
This patch adds to support checkpoint error injection in f2fs for testing
fatal error tolerance.
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
fs/f2fs/checkpoint.c | 14 +++++++++++---
fs/f2fs/data.c | 7 ++++---
fs/f2fs/f2fs.h | 5 ++++-
fs/f2fs/file.c | 8 ++++----
fs/f2fs/inode.c | 7 +++++--
fs/f2fs/super.c | 1 +
6 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index d1560bb..834c8ec 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -26,8 +26,17 @@
static struct kmem_cache *ino_entry_slab;
struct kmem_cache *inode_entry_slab;
-void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
+void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi,
+ bool end_io, bool need_stop)
{
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (time_to_inject(FAULT_CHECKPOINT))
+ need_stop = true;
+#endif
+
+ if (!need_stop)
+ return;
+
set_ckpt_flags(sbi, CP_ERROR_FLAG);
sbi->sb->s_flags |= MS_RDONLY;
if (!end_io)
@@ -100,8 +109,7 @@ repeat:
* readonly and make sure do not write checkpoint with non-uptodate
* meta page.
*/
- if (unlikely(!PageUptodate(page)))
- f2fs_stop_checkpoint(sbi, false);
+ f2fs_stop_checkpoint(sbi, false, !PageUptodate(page));
out:
return page;
}
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a9f7436..1b00d3d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -74,10 +74,11 @@ static void f2fs_write_end_io(struct bio *bio)
fscrypt_pullback_bio_page(&page, true);
- if (unlikely(bio->bi_error)) {
+ f2fs_stop_checkpoint(sbi, true, bio->bi_error);
+
+ if (unlikely(bio->bi_error))
set_bit(AS_EIO, &page->mapping->flags);
- f2fs_stop_checkpoint(sbi, true);
- }
+
end_page_writeback(page);
}
if (atomic_dec_and_test(&sbi->nr_wb_bios) &&
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e216bc0..7bc1802 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -47,6 +47,7 @@ enum {
FAULT_DIR_DEPTH,
FAULT_EVICT_INODE,
FAULT_IO,
+ FAULT_CHECKPOINT,
FAULT_MAX,
};
@@ -80,6 +81,8 @@ static inline bool time_to_inject(int type)
return false;
else if (type == FAULT_IO && !IS_FAULT_SET(type))
return false;
+ else if (type == FAULT_CHECKPOINT && !IS_FAULT_SET(type))
+ return false;
atomic_inc(&f2fs_fault.inject_ops);
if (atomic_read(&f2fs_fault.inject_ops) >= f2fs_fault.inject_rate) {
@@ -2115,7 +2118,7 @@ void destroy_segment_manager_caches(void);
/*
* checkpoint.c
*/
-void f2fs_stop_checkpoint(struct f2fs_sb_info *, bool);
+void f2fs_stop_checkpoint(struct f2fs_sb_info *, bool, bool);
struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_tmp_page(struct f2fs_sb_info *, pgoff_t);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d341a0e..57c7a64 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1720,21 +1720,21 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
case F2FS_GOING_DOWN_FULLSYNC:
sb = freeze_bdev(sb->s_bdev);
if (sb && !IS_ERR(sb)) {
- f2fs_stop_checkpoint(sbi, false);
+ f2fs_stop_checkpoint(sbi, false, true);
thaw_bdev(sb->s_bdev, sb);
}
break;
case F2FS_GOING_DOWN_METASYNC:
/* do checkpoint only */
f2fs_sync_fs(sb, 1);
- f2fs_stop_checkpoint(sbi, false);
+ f2fs_stop_checkpoint(sbi, false, true);
break;
case F2FS_GOING_DOWN_NOSYNC:
- f2fs_stop_checkpoint(sbi, false);
+ f2fs_stop_checkpoint(sbi, false, true);
break;
case F2FS_GOING_DOWN_METAFLUSH:
sync_meta_pages(sbi, META, LONG_MAX);
- f2fs_stop_checkpoint(sbi, false);
+ f2fs_stop_checkpoint(sbi, false, true);
break;
default:
ret = -EINVAL;
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index ac4daa5..bf53cd2 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -306,12 +306,15 @@ retry:
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page)) {
int err = PTR_ERR(node_page);
+
+ f2fs_stop_checkpoint(sbi, false,
+ err != -ENOMEM && err != -ENOENT);
+
if (err == -ENOMEM) {
cond_resched();
goto retry;
- } else if (err != -ENOENT) {
- f2fs_stop_checkpoint(sbi, false);
}
+
f2fs_inode_synced(inode);
return 0;
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6426855..3c49419 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -51,6 +51,7 @@ char *fault_name[FAULT_MAX] = {
[FAULT_DIR_DEPTH] = "too big dir depth",
[FAULT_EVICT_INODE] = "evict_inode fail",
[FAULT_IO] = "IO error",
+ [FAULT_CHECKPOINT] = "checkpoint error",
};
static void f2fs_build_fault_attr(unsigned int rate)
--
2.8.2.311.gee88674
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