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Date: Fri, 23 Sep 2016 17:52:16 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
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
On Sat, Sep 24, 2016 at 08:46:54AM +0800, Chao Yu wrote:
> 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?
Let's just use src/godown in xfstests, since we don't need to trigger this
multiple times in runtime.
>
> >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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