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* [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode
@ 2019-07-17  1:28 Chao Yu
  2019-08-05  9:51 ` Chao Yu
  0 siblings, 1 reply; 4+ messages in thread
From: Chao Yu @ 2019-07-17  1:28 UTC (permalink / raw)
  To: jaegeuk; +Cc: linux-f2fs-devel

This original patch was from Weichao Guo.

We may encounter both checkpoints invalid in such a case:
1. kernel writes CP A;
2. power-cut when kernel writes CP B, then CP B is corrupted;
3. fsck: load CP A, fix meta/data;
4. power-cut when fsck writes CP A in-place, then CP A is corrupted too;

To avoid both checkpoints being invalid, this patch changes to duplicate
valid checkpoint to mirror position first, and then, write fixed checkpoint
to CP #0 position.

This can make sure that, while fsck repairing, even there is sudden
power-cut, last valid checkpoint can be kept in CP #1 position.

Signed-off-by: Weichao Guo <guoweichao@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
v3:
- fix wrong size of duplication.
 fsck/f2fs.h  |  2 ++
 fsck/fsck.c  | 15 +++++++++++++--
 fsck/fsck.h  |  2 ++
 fsck/mount.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/fsck/f2fs.h b/fsck/f2fs.h
index 4dc6698..52e68ec 100644
--- a/fsck/f2fs.h
+++ b/fsck/f2fs.h
@@ -195,6 +195,8 @@ struct f2fs_sb_info {
 
 	unsigned int cur_victim_sec;            /* current victim section num */
 	u32 free_segments;
+
+	int cp_backuped;			/* backup valid checkpoint */
 };
 
 static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
diff --git a/fsck/fsck.c b/fsck/fsck.c
index 8953ca1..49363d3 100644
--- a/fsck/fsck.c
+++ b/fsck/fsck.c
@@ -2127,6 +2127,16 @@ static void fix_checkpoint(struct f2fs_sb_info *sbi)
 	ASSERT(ret >= 0);
 }
 
+static void fix_checkpoints(struct f2fs_sb_info *sbi)
+{
+	/* copy valid checkpoint to its mirror position */
+	duplicate_checkpoint(sbi);
+
+	/* repair checkpoint at CP #0 position */
+	sbi->cur_cp = 1;
+	fix_checkpoint(sbi);
+}
+
 int check_curseg_offset(struct f2fs_sb_info *sbi, int type)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
@@ -2765,6 +2775,7 @@ int fsck_verify(struct f2fs_sb_info *sbi)
 		}
 	}
 #endif
+
 	/* fix global metadata */
 	if (force || (c.fix_on && f2fs_dev_is_writable())) {
 		struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
@@ -2777,10 +2788,10 @@ int fsck_verify(struct f2fs_sb_info *sbi)
 			rewrite_sit_area_bitmap(sbi);
 			fix_curseg_info(sbi);
 			fix_checksum(sbi);
-			fix_checkpoint(sbi);
+			fix_checkpoints(sbi);
 		} else if (is_set_ckpt_flags(cp, CP_FSCK_FLAG) ||
 			is_set_ckpt_flags(cp, CP_QUOTA_NEED_FSCK_FLAG)) {
-			write_checkpoint(sbi);
+			write_checkpoints(sbi);
 		}
 	}
 	return ret;
diff --git a/fsck/fsck.h b/fsck/fsck.h
index d38e8de..3699b35 100644
--- a/fsck/fsck.h
+++ b/fsck/fsck.h
@@ -191,7 +191,9 @@ extern void flush_sit_entries(struct f2fs_sb_info *);
 extern void move_curseg_info(struct f2fs_sb_info *, u64, int);
 extern void write_curseg_info(struct f2fs_sb_info *);
 extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int);
+extern void duplicate_checkpoint(struct f2fs_sb_info *);
 extern void write_checkpoint(struct f2fs_sb_info *);
+extern void write_checkpoints(struct f2fs_sb_info *);
 extern void update_superblock(struct f2fs_super_block *, int);
 extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t);
 extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t);
diff --git a/fsck/mount.c b/fsck/mount.c
index 60e0e4a..973c82f 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -2229,7 +2229,7 @@ void flush_journal_entries(struct f2fs_sb_info *sbi)
 	int n_sits = flush_sit_journal_entries(sbi);
 
 	if (n_nats || n_sits)
-		write_checkpoint(sbi);
+		write_checkpoints(sbi);
 }
 
 void flush_sit_entries(struct f2fs_sb_info *sbi)
@@ -2478,6 +2478,47 @@ void nullify_nat_entry(struct f2fs_sb_info *sbi, u32 nid)
 	free(nat_block);
 }
 
+void duplicate_checkpoint(struct f2fs_sb_info *sbi)
+{
+	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
+	unsigned long long dst, src;
+	void *buf;
+	unsigned int seg_size = 1 << get_sb(log_blocks_per_seg);
+	int ret;
+
+	if (sbi->cp_backuped)
+		return;
+
+	buf = malloc(F2FS_BLKSIZE * seg_size);
+	ASSERT(buf);
+
+	if (sbi->cur_cp == 1) {
+		src = get_sb(cp_blkaddr);
+		dst = src + seg_size;
+	} else {
+		dst = get_sb(cp_blkaddr);
+		src = dst + seg_size;
+	}
+
+	ret = dev_read(buf, src << F2FS_BLKSIZE_BITS,
+				seg_size << F2FS_BLKSIZE_BITS);
+	ASSERT(ret >= 0);
+
+	ret = dev_write(buf, dst << F2FS_BLKSIZE_BITS,
+				seg_size << F2FS_BLKSIZE_BITS);
+	ASSERT(ret >= 0);
+
+	free(buf);
+
+	ret = f2fs_fsync_device();
+	ASSERT(ret >= 0);
+
+	sbi->cp_backuped = 1;
+
+	MSG(0, "Info: Duplicate valid checkpoint to mirror position "
+		"%llu -> %llu\n", src, dst);
+}
+
 void write_checkpoint(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
@@ -2557,6 +2598,16 @@ void write_checkpoint(struct f2fs_sb_info *sbi)
 	ASSERT(ret >= 0);
 }
 
+void write_checkpoints(struct f2fs_sb_info *sbi)
+{
+	/* copy valid checkpoint to its mirror position */
+	duplicate_checkpoint(sbi);
+
+	/* repair checkpoint at CP #0 position */
+	sbi->cur_cp = 1;
+	write_checkpoint(sbi);
+}
+
 void build_nat_area_bitmap(struct f2fs_sb_info *sbi)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
-- 
2.18.0.rc1



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* Re: [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode
  2019-07-17  1:28 [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode Chao Yu
@ 2019-08-05  9:51 ` Chao Yu
  2019-08-06  0:48   ` Jaegeuk Kim
  0 siblings, 1 reply; 4+ messages in thread
From: Chao Yu @ 2019-08-05  9:51 UTC (permalink / raw)
  To: jaegeuk; +Cc: linux-f2fs-devel

Jaegeuk,

Any test updates on this patch?

Could you update dev/dev-test branch of tools repo, so that I can rebase on them.

On 2019/7/17 9:28, Chao Yu wrote:
> This original patch was from Weichao Guo.
> 
> We may encounter both checkpoints invalid in such a case:
> 1. kernel writes CP A;
> 2. power-cut when kernel writes CP B, then CP B is corrupted;
> 3. fsck: load CP A, fix meta/data;
> 4. power-cut when fsck writes CP A in-place, then CP A is corrupted too;
> 
> To avoid both checkpoints being invalid, this patch changes to duplicate
> valid checkpoint to mirror position first, and then, write fixed checkpoint
> to CP #0 position.
> 
> This can make sure that, while fsck repairing, even there is sudden
> power-cut, last valid checkpoint can be kept in CP #1 position.
> 
> Signed-off-by: Weichao Guo <guoweichao@huawei.com>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> v3:
> - fix wrong size of duplication.
>  fsck/f2fs.h  |  2 ++
>  fsck/fsck.c  | 15 +++++++++++++--
>  fsck/fsck.h  |  2 ++
>  fsck/mount.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
>  4 files changed, 69 insertions(+), 3 deletions(-)
> 
> diff --git a/fsck/f2fs.h b/fsck/f2fs.h
> index 4dc6698..52e68ec 100644
> --- a/fsck/f2fs.h
> +++ b/fsck/f2fs.h
> @@ -195,6 +195,8 @@ struct f2fs_sb_info {
>  
>  	unsigned int cur_victim_sec;            /* current victim section num */
>  	u32 free_segments;
> +
> +	int cp_backuped;			/* backup valid checkpoint */
>  };
>  
>  static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
> diff --git a/fsck/fsck.c b/fsck/fsck.c
> index 8953ca1..49363d3 100644
> --- a/fsck/fsck.c
> +++ b/fsck/fsck.c
> @@ -2127,6 +2127,16 @@ static void fix_checkpoint(struct f2fs_sb_info *sbi)
>  	ASSERT(ret >= 0);
>  }
>  
> +static void fix_checkpoints(struct f2fs_sb_info *sbi)
> +{
> +	/* copy valid checkpoint to its mirror position */
> +	duplicate_checkpoint(sbi);
> +
> +	/* repair checkpoint at CP #0 position */
> +	sbi->cur_cp = 1;
> +	fix_checkpoint(sbi);
> +}
> +
>  int check_curseg_offset(struct f2fs_sb_info *sbi, int type)
>  {
>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> @@ -2765,6 +2775,7 @@ int fsck_verify(struct f2fs_sb_info *sbi)
>  		}
>  	}
>  #endif
> +
>  	/* fix global metadata */
>  	if (force || (c.fix_on && f2fs_dev_is_writable())) {
>  		struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
> @@ -2777,10 +2788,10 @@ int fsck_verify(struct f2fs_sb_info *sbi)
>  			rewrite_sit_area_bitmap(sbi);
>  			fix_curseg_info(sbi);
>  			fix_checksum(sbi);
> -			fix_checkpoint(sbi);
> +			fix_checkpoints(sbi);
>  		} else if (is_set_ckpt_flags(cp, CP_FSCK_FLAG) ||
>  			is_set_ckpt_flags(cp, CP_QUOTA_NEED_FSCK_FLAG)) {
> -			write_checkpoint(sbi);
> +			write_checkpoints(sbi);
>  		}
>  	}
>  	return ret;
> diff --git a/fsck/fsck.h b/fsck/fsck.h
> index d38e8de..3699b35 100644
> --- a/fsck/fsck.h
> +++ b/fsck/fsck.h
> @@ -191,7 +191,9 @@ extern void flush_sit_entries(struct f2fs_sb_info *);
>  extern void move_curseg_info(struct f2fs_sb_info *, u64, int);
>  extern void write_curseg_info(struct f2fs_sb_info *);
>  extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int);
> +extern void duplicate_checkpoint(struct f2fs_sb_info *);
>  extern void write_checkpoint(struct f2fs_sb_info *);
> +extern void write_checkpoints(struct f2fs_sb_info *);
>  extern void update_superblock(struct f2fs_super_block *, int);
>  extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t);
>  extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t);
> diff --git a/fsck/mount.c b/fsck/mount.c
> index 60e0e4a..973c82f 100644
> --- a/fsck/mount.c
> +++ b/fsck/mount.c
> @@ -2229,7 +2229,7 @@ void flush_journal_entries(struct f2fs_sb_info *sbi)
>  	int n_sits = flush_sit_journal_entries(sbi);
>  
>  	if (n_nats || n_sits)
> -		write_checkpoint(sbi);
> +		write_checkpoints(sbi);
>  }
>  
>  void flush_sit_entries(struct f2fs_sb_info *sbi)
> @@ -2478,6 +2478,47 @@ void nullify_nat_entry(struct f2fs_sb_info *sbi, u32 nid)
>  	free(nat_block);
>  }
>  
> +void duplicate_checkpoint(struct f2fs_sb_info *sbi)
> +{
> +	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
> +	unsigned long long dst, src;
> +	void *buf;
> +	unsigned int seg_size = 1 << get_sb(log_blocks_per_seg);
> +	int ret;
> +
> +	if (sbi->cp_backuped)
> +		return;
> +
> +	buf = malloc(F2FS_BLKSIZE * seg_size);
> +	ASSERT(buf);
> +
> +	if (sbi->cur_cp == 1) {
> +		src = get_sb(cp_blkaddr);
> +		dst = src + seg_size;
> +	} else {
> +		dst = get_sb(cp_blkaddr);
> +		src = dst + seg_size;
> +	}
> +
> +	ret = dev_read(buf, src << F2FS_BLKSIZE_BITS,
> +				seg_size << F2FS_BLKSIZE_BITS);
> +	ASSERT(ret >= 0);
> +
> +	ret = dev_write(buf, dst << F2FS_BLKSIZE_BITS,
> +				seg_size << F2FS_BLKSIZE_BITS);
> +	ASSERT(ret >= 0);
> +
> +	free(buf);
> +
> +	ret = f2fs_fsync_device();
> +	ASSERT(ret >= 0);
> +
> +	sbi->cp_backuped = 1;
> +
> +	MSG(0, "Info: Duplicate valid checkpoint to mirror position "
> +		"%llu -> %llu\n", src, dst);
> +}
> +
>  void write_checkpoint(struct f2fs_sb_info *sbi)
>  {
>  	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
> @@ -2557,6 +2598,16 @@ void write_checkpoint(struct f2fs_sb_info *sbi)
>  	ASSERT(ret >= 0);
>  }
>  
> +void write_checkpoints(struct f2fs_sb_info *sbi)
> +{
> +	/* copy valid checkpoint to its mirror position */
> +	duplicate_checkpoint(sbi);
> +
> +	/* repair checkpoint at CP #0 position */
> +	sbi->cur_cp = 1;
> +	write_checkpoint(sbi);
> +}
> +
>  void build_nat_area_bitmap(struct f2fs_sb_info *sbi)
>  {
>  	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
> 


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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode
  2019-08-05  9:51 ` Chao Yu
@ 2019-08-06  0:48   ` Jaegeuk Kim
  2019-08-06  1:43     ` Chao Yu
  0 siblings, 1 reply; 4+ messages in thread
From: Jaegeuk Kim @ 2019-08-06  0:48 UTC (permalink / raw)
  To: Chao Yu; +Cc: linux-f2fs-devel

On 08/05, Chao Yu wrote:
> Jaegeuk,
> 
> Any test updates on this patch?
> 
> Could you update dev/dev-test branch of tools repo, so that I can rebase on them.
> 

I think this seems fine to go. Let me update as soon as possible.

> On 2019/7/17 9:28, Chao Yu wrote:
> > This original patch was from Weichao Guo.
> > 
> > We may encounter both checkpoints invalid in such a case:
> > 1. kernel writes CP A;
> > 2. power-cut when kernel writes CP B, then CP B is corrupted;
> > 3. fsck: load CP A, fix meta/data;
> > 4. power-cut when fsck writes CP A in-place, then CP A is corrupted too;
> > 
> > To avoid both checkpoints being invalid, this patch changes to duplicate
> > valid checkpoint to mirror position first, and then, write fixed checkpoint
> > to CP #0 position.
> > 
> > This can make sure that, while fsck repairing, even there is sudden
> > power-cut, last valid checkpoint can be kept in CP #1 position.
> > 
> > Signed-off-by: Weichao Guo <guoweichao@huawei.com>
> > Signed-off-by: Chao Yu <yuchao0@huawei.com>
> > ---
> > v3:
> > - fix wrong size of duplication.
> >  fsck/f2fs.h  |  2 ++
> >  fsck/fsck.c  | 15 +++++++++++++--
> >  fsck/fsck.h  |  2 ++
> >  fsck/mount.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
> >  4 files changed, 69 insertions(+), 3 deletions(-)
> > 
> > diff --git a/fsck/f2fs.h b/fsck/f2fs.h
> > index 4dc6698..52e68ec 100644
> > --- a/fsck/f2fs.h
> > +++ b/fsck/f2fs.h
> > @@ -195,6 +195,8 @@ struct f2fs_sb_info {
> >  
> >  	unsigned int cur_victim_sec;            /* current victim section num */
> >  	u32 free_segments;
> > +
> > +	int cp_backuped;			/* backup valid checkpoint */
> >  };
> >  
> >  static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
> > diff --git a/fsck/fsck.c b/fsck/fsck.c
> > index 8953ca1..49363d3 100644
> > --- a/fsck/fsck.c
> > +++ b/fsck/fsck.c
> > @@ -2127,6 +2127,16 @@ static void fix_checkpoint(struct f2fs_sb_info *sbi)
> >  	ASSERT(ret >= 0);
> >  }
> >  
> > +static void fix_checkpoints(struct f2fs_sb_info *sbi)
> > +{
> > +	/* copy valid checkpoint to its mirror position */
> > +	duplicate_checkpoint(sbi);
> > +
> > +	/* repair checkpoint at CP #0 position */
> > +	sbi->cur_cp = 1;
> > +	fix_checkpoint(sbi);
> > +}
> > +
> >  int check_curseg_offset(struct f2fs_sb_info *sbi, int type)
> >  {
> >  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> > @@ -2765,6 +2775,7 @@ int fsck_verify(struct f2fs_sb_info *sbi)
> >  		}
> >  	}
> >  #endif
> > +
> >  	/* fix global metadata */
> >  	if (force || (c.fix_on && f2fs_dev_is_writable())) {
> >  		struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
> > @@ -2777,10 +2788,10 @@ int fsck_verify(struct f2fs_sb_info *sbi)
> >  			rewrite_sit_area_bitmap(sbi);
> >  			fix_curseg_info(sbi);
> >  			fix_checksum(sbi);
> > -			fix_checkpoint(sbi);
> > +			fix_checkpoints(sbi);
> >  		} else if (is_set_ckpt_flags(cp, CP_FSCK_FLAG) ||
> >  			is_set_ckpt_flags(cp, CP_QUOTA_NEED_FSCK_FLAG)) {
> > -			write_checkpoint(sbi);
> > +			write_checkpoints(sbi);
> >  		}
> >  	}
> >  	return ret;
> > diff --git a/fsck/fsck.h b/fsck/fsck.h
> > index d38e8de..3699b35 100644
> > --- a/fsck/fsck.h
> > +++ b/fsck/fsck.h
> > @@ -191,7 +191,9 @@ extern void flush_sit_entries(struct f2fs_sb_info *);
> >  extern void move_curseg_info(struct f2fs_sb_info *, u64, int);
> >  extern void write_curseg_info(struct f2fs_sb_info *);
> >  extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int);
> > +extern void duplicate_checkpoint(struct f2fs_sb_info *);
> >  extern void write_checkpoint(struct f2fs_sb_info *);
> > +extern void write_checkpoints(struct f2fs_sb_info *);
> >  extern void update_superblock(struct f2fs_super_block *, int);
> >  extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t);
> >  extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t);
> > diff --git a/fsck/mount.c b/fsck/mount.c
> > index 60e0e4a..973c82f 100644
> > --- a/fsck/mount.c
> > +++ b/fsck/mount.c
> > @@ -2229,7 +2229,7 @@ void flush_journal_entries(struct f2fs_sb_info *sbi)
> >  	int n_sits = flush_sit_journal_entries(sbi);
> >  
> >  	if (n_nats || n_sits)
> > -		write_checkpoint(sbi);
> > +		write_checkpoints(sbi);
> >  }
> >  
> >  void flush_sit_entries(struct f2fs_sb_info *sbi)
> > @@ -2478,6 +2478,47 @@ void nullify_nat_entry(struct f2fs_sb_info *sbi, u32 nid)
> >  	free(nat_block);
> >  }
> >  
> > +void duplicate_checkpoint(struct f2fs_sb_info *sbi)
> > +{
> > +	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
> > +	unsigned long long dst, src;
> > +	void *buf;
> > +	unsigned int seg_size = 1 << get_sb(log_blocks_per_seg);
> > +	int ret;
> > +
> > +	if (sbi->cp_backuped)
> > +		return;
> > +
> > +	buf = malloc(F2FS_BLKSIZE * seg_size);
> > +	ASSERT(buf);
> > +
> > +	if (sbi->cur_cp == 1) {
> > +		src = get_sb(cp_blkaddr);
> > +		dst = src + seg_size;
> > +	} else {
> > +		dst = get_sb(cp_blkaddr);
> > +		src = dst + seg_size;
> > +	}
> > +
> > +	ret = dev_read(buf, src << F2FS_BLKSIZE_BITS,
> > +				seg_size << F2FS_BLKSIZE_BITS);
> > +	ASSERT(ret >= 0);
> > +
> > +	ret = dev_write(buf, dst << F2FS_BLKSIZE_BITS,
> > +				seg_size << F2FS_BLKSIZE_BITS);
> > +	ASSERT(ret >= 0);
> > +
> > +	free(buf);
> > +
> > +	ret = f2fs_fsync_device();
> > +	ASSERT(ret >= 0);
> > +
> > +	sbi->cp_backuped = 1;
> > +
> > +	MSG(0, "Info: Duplicate valid checkpoint to mirror position "
> > +		"%llu -> %llu\n", src, dst);
> > +}
> > +
> >  void write_checkpoint(struct f2fs_sb_info *sbi)
> >  {
> >  	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
> > @@ -2557,6 +2598,16 @@ void write_checkpoint(struct f2fs_sb_info *sbi)
> >  	ASSERT(ret >= 0);
> >  }
> >  
> > +void write_checkpoints(struct f2fs_sb_info *sbi)
> > +{
> > +	/* copy valid checkpoint to its mirror position */
> > +	duplicate_checkpoint(sbi);
> > +
> > +	/* repair checkpoint at CP #0 position */
> > +	sbi->cur_cp = 1;
> > +	write_checkpoint(sbi);
> > +}
> > +
> >  void build_nat_area_bitmap(struct f2fs_sb_info *sbi)
> >  {
> >  	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
> > 


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* Re: [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode
  2019-08-06  0:48   ` Jaegeuk Kim
@ 2019-08-06  1:43     ` Chao Yu
  0 siblings, 0 replies; 4+ messages in thread
From: Chao Yu @ 2019-08-06  1:43 UTC (permalink / raw)
  To: Jaegeuk Kim; +Cc: linux-f2fs-devel

On 2019/8/6 8:48, Jaegeuk Kim wrote:
> On 08/05, Chao Yu wrote:
>> Jaegeuk,
>>
>> Any test updates on this patch?
>>
>> Could you update dev/dev-test branch of tools repo, so that I can rebase on them.
>>
> 
> I think this seems fine to go. Let me update as soon as possible.

Cool, thanks!

Thanks,

> 
>> On 2019/7/17 9:28, Chao Yu wrote:
>>> This original patch was from Weichao Guo.
>>>
>>> We may encounter both checkpoints invalid in such a case:
>>> 1. kernel writes CP A;
>>> 2. power-cut when kernel writes CP B, then CP B is corrupted;
>>> 3. fsck: load CP A, fix meta/data;
>>> 4. power-cut when fsck writes CP A in-place, then CP A is corrupted too;
>>>
>>> To avoid both checkpoints being invalid, this patch changes to duplicate
>>> valid checkpoint to mirror position first, and then, write fixed checkpoint
>>> to CP #0 position.
>>>
>>> This can make sure that, while fsck repairing, even there is sudden
>>> power-cut, last valid checkpoint can be kept in CP #1 position.
>>>
>>> Signed-off-by: Weichao Guo <guoweichao@huawei.com>
>>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>>> ---
>>> v3:
>>> - fix wrong size of duplication.
>>>  fsck/f2fs.h  |  2 ++
>>>  fsck/fsck.c  | 15 +++++++++++++--
>>>  fsck/fsck.h  |  2 ++
>>>  fsck/mount.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
>>>  4 files changed, 69 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/fsck/f2fs.h b/fsck/f2fs.h
>>> index 4dc6698..52e68ec 100644
>>> --- a/fsck/f2fs.h
>>> +++ b/fsck/f2fs.h
>>> @@ -195,6 +195,8 @@ struct f2fs_sb_info {
>>>  
>>>  	unsigned int cur_victim_sec;            /* current victim section num */
>>>  	u32 free_segments;
>>> +
>>> +	int cp_backuped;			/* backup valid checkpoint */
>>>  };
>>>  
>>>  static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
>>> diff --git a/fsck/fsck.c b/fsck/fsck.c
>>> index 8953ca1..49363d3 100644
>>> --- a/fsck/fsck.c
>>> +++ b/fsck/fsck.c
>>> @@ -2127,6 +2127,16 @@ static void fix_checkpoint(struct f2fs_sb_info *sbi)
>>>  	ASSERT(ret >= 0);
>>>  }
>>>  
>>> +static void fix_checkpoints(struct f2fs_sb_info *sbi)
>>> +{
>>> +	/* copy valid checkpoint to its mirror position */
>>> +	duplicate_checkpoint(sbi);
>>> +
>>> +	/* repair checkpoint at CP #0 position */
>>> +	sbi->cur_cp = 1;
>>> +	fix_checkpoint(sbi);
>>> +}
>>> +
>>>  int check_curseg_offset(struct f2fs_sb_info *sbi, int type)
>>>  {
>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
>>> @@ -2765,6 +2775,7 @@ int fsck_verify(struct f2fs_sb_info *sbi)
>>>  		}
>>>  	}
>>>  #endif
>>> +
>>>  	/* fix global metadata */
>>>  	if (force || (c.fix_on && f2fs_dev_is_writable())) {
>>>  		struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
>>> @@ -2777,10 +2788,10 @@ int fsck_verify(struct f2fs_sb_info *sbi)
>>>  			rewrite_sit_area_bitmap(sbi);
>>>  			fix_curseg_info(sbi);
>>>  			fix_checksum(sbi);
>>> -			fix_checkpoint(sbi);
>>> +			fix_checkpoints(sbi);
>>>  		} else if (is_set_ckpt_flags(cp, CP_FSCK_FLAG) ||
>>>  			is_set_ckpt_flags(cp, CP_QUOTA_NEED_FSCK_FLAG)) {
>>> -			write_checkpoint(sbi);
>>> +			write_checkpoints(sbi);
>>>  		}
>>>  	}
>>>  	return ret;
>>> diff --git a/fsck/fsck.h b/fsck/fsck.h
>>> index d38e8de..3699b35 100644
>>> --- a/fsck/fsck.h
>>> +++ b/fsck/fsck.h
>>> @@ -191,7 +191,9 @@ extern void flush_sit_entries(struct f2fs_sb_info *);
>>>  extern void move_curseg_info(struct f2fs_sb_info *, u64, int);
>>>  extern void write_curseg_info(struct f2fs_sb_info *);
>>>  extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int);
>>> +extern void duplicate_checkpoint(struct f2fs_sb_info *);
>>>  extern void write_checkpoint(struct f2fs_sb_info *);
>>> +extern void write_checkpoints(struct f2fs_sb_info *);
>>>  extern void update_superblock(struct f2fs_super_block *, int);
>>>  extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t);
>>>  extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t);
>>> diff --git a/fsck/mount.c b/fsck/mount.c
>>> index 60e0e4a..973c82f 100644
>>> --- a/fsck/mount.c
>>> +++ b/fsck/mount.c
>>> @@ -2229,7 +2229,7 @@ void flush_journal_entries(struct f2fs_sb_info *sbi)
>>>  	int n_sits = flush_sit_journal_entries(sbi);
>>>  
>>>  	if (n_nats || n_sits)
>>> -		write_checkpoint(sbi);
>>> +		write_checkpoints(sbi);
>>>  }
>>>  
>>>  void flush_sit_entries(struct f2fs_sb_info *sbi)
>>> @@ -2478,6 +2478,47 @@ void nullify_nat_entry(struct f2fs_sb_info *sbi, u32 nid)
>>>  	free(nat_block);
>>>  }
>>>  
>>> +void duplicate_checkpoint(struct f2fs_sb_info *sbi)
>>> +{
>>> +	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
>>> +	unsigned long long dst, src;
>>> +	void *buf;
>>> +	unsigned int seg_size = 1 << get_sb(log_blocks_per_seg);
>>> +	int ret;
>>> +
>>> +	if (sbi->cp_backuped)
>>> +		return;
>>> +
>>> +	buf = malloc(F2FS_BLKSIZE * seg_size);
>>> +	ASSERT(buf);
>>> +
>>> +	if (sbi->cur_cp == 1) {
>>> +		src = get_sb(cp_blkaddr);
>>> +		dst = src + seg_size;
>>> +	} else {
>>> +		dst = get_sb(cp_blkaddr);
>>> +		src = dst + seg_size;
>>> +	}
>>> +
>>> +	ret = dev_read(buf, src << F2FS_BLKSIZE_BITS,
>>> +				seg_size << F2FS_BLKSIZE_BITS);
>>> +	ASSERT(ret >= 0);
>>> +
>>> +	ret = dev_write(buf, dst << F2FS_BLKSIZE_BITS,
>>> +				seg_size << F2FS_BLKSIZE_BITS);
>>> +	ASSERT(ret >= 0);
>>> +
>>> +	free(buf);
>>> +
>>> +	ret = f2fs_fsync_device();
>>> +	ASSERT(ret >= 0);
>>> +
>>> +	sbi->cp_backuped = 1;
>>> +
>>> +	MSG(0, "Info: Duplicate valid checkpoint to mirror position "
>>> +		"%llu -> %llu\n", src, dst);
>>> +}
>>> +
>>>  void write_checkpoint(struct f2fs_sb_info *sbi)
>>>  {
>>>  	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
>>> @@ -2557,6 +2598,16 @@ void write_checkpoint(struct f2fs_sb_info *sbi)
>>>  	ASSERT(ret >= 0);
>>>  }
>>>  
>>> +void write_checkpoints(struct f2fs_sb_info *sbi)
>>> +{
>>> +	/* copy valid checkpoint to its mirror position */
>>> +	duplicate_checkpoint(sbi);
>>> +
>>> +	/* repair checkpoint at CP #0 position */
>>> +	sbi->cur_cp = 1;
>>> +	write_checkpoint(sbi);
>>> +}
>>> +
>>>  void build_nat_area_bitmap(struct f2fs_sb_info *sbi)
>>>  {
>>>  	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
>>>
> .
> 


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-- links below jump to the message on this page --
2019-07-17  1:28 [f2fs-dev] [PATCH v3] fsck.f2fs: write checkpoint with OPU mode Chao Yu
2019-08-05  9:51 ` Chao Yu
2019-08-06  0:48   ` Jaegeuk Kim
2019-08-06  1:43     ` Chao Yu

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