LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Chao Yu <yuchao0@huawei.com>
To: Daniel Rosenberg <drosen@google.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	<linux-f2fs-devel@lists.sourceforge.net>
Cc: <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>,
	<linux-fsdevel@vger.kernel.org>, <kernel-team@android.com>
Subject: Re: [PATCH v3 3/4] f2fs: Fix accounting for unusable blocks
Date: Mon, 3 Jun 2019 18:39:29 +0800	[thread overview]
Message-ID: <c99079bd-99e1-e100-08f6-1e8adae5e722@huawei.com> (raw)
In-Reply-To: <20190530004906.261170-4-drosen@google.com>

On 2019/5/30 8:49, Daniel Rosenberg wrote:
> Fixes possible underflows when dealing with unusable blocks.
> 
> Signed-off-by: Daniel Rosenberg <drosen@google.com>
> ---
>  fs/f2fs/f2fs.h | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 9b3d9977cd1ef..a39cc4ffeb4b1 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1769,8 +1769,12 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
>  
>  	if (!__allow_reserved_blocks(sbi, inode, true))
>  		avail_user_block_count -= F2FS_OPTION(sbi).root_reserved_blocks;
> -	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> -		avail_user_block_count -= sbi->unusable_block_count;
> +	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
> +		if (avail_user_block_count > sbi->unusable_block_count)
> +			avail_user_block_count = 0;

avail_user_block_count -= sbi->unusable_block_count;

> +		else
> +			avail_user_block_count -= sbi->unusable_block_count;

avail_user_block_count = 0;

Thanks,

> +	}
>  	if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
>  		diff = sbi->total_valid_block_count - avail_user_block_count;
>  		if (diff > *count)
> @@ -1970,7 +1974,7 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
>  					struct inode *inode, bool is_inode)
>  {
>  	block_t	valid_block_count;
> -	unsigned int valid_node_count;
> +	unsigned int valid_node_count, user_block_count;
>  	int err;
>  
>  	if (is_inode) {
> @@ -1997,10 +2001,11 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
>  
>  	if (!__allow_reserved_blocks(sbi, inode, false))
>  		valid_block_count += F2FS_OPTION(sbi).root_reserved_blocks;
> +	user_block_count = sbi->user_block_count;
>  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> -		valid_block_count += sbi->unusable_block_count;
> +		user_block_count -= sbi->unusable_block_count;
>  
> -	if (unlikely(valid_block_count > sbi->user_block_count)) {
> +	if (unlikely(valid_block_count > user_block_count)) {
>  		spin_unlock(&sbi->stat_lock);
>  		goto enospc;
>  	}
> 

  reply	other threads:[~2019-06-03 10:40 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-30  0:49 [PATCH v3 0/4] F2FS Checkpointing without GC, related fixes Daniel Rosenberg
2019-05-30  0:49 ` [PATCH v3 1/4] f2fs: Lower threshold for disable_cp_again Daniel Rosenberg
2019-06-03 10:33   ` Chao Yu
2019-05-30  0:49 ` [PATCH v3 2/4] f2fs: Fix root reserved on remount Daniel Rosenberg
2019-06-03 10:34   ` Chao Yu
2019-05-30  0:49 ` [PATCH v3 3/4] f2fs: Fix accounting for unusable blocks Daniel Rosenberg
2019-06-03 10:39   ` Chao Yu [this message]
2019-06-03 20:26     ` Jaegeuk Kim
2019-06-04  1:46       ` Chao Yu
2019-05-30  0:49 ` [PATCH v3 4/4] f2fs: Add option to limit required GC for checkpoint=disable Daniel Rosenberg
2019-06-03 15:15   ` [f2fs-dev] " Chao Yu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=c99079bd-99e1-e100-08f6-1e8adae5e722@huawei.com \
    --to=yuchao0@huawei.com \
    --cc=corbet@lwn.net \
    --cc=drosen@google.com \
    --cc=jaegeuk@kernel.org \
    --cc=kernel-team@android.com \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-f2fs-devel@lists.sourceforge.net \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH v3 3/4] f2fs: Fix accounting for unusable blocks' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).