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From: Eric Biggers <ebiggers@kernel.org>
To: Daeho Jeong <daeho43@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com,
	Daeho Jeong <daehojeong@google.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix race of pending_pages in decompression
Date: Thu, 3 Dec 2020 19:28:11 -0800	[thread overview]
Message-ID: <X8msy1T8uqZ4Z/iR@sol.localdomain> (raw)
In-Reply-To: <20201204005847.654074-1-daeho43@gmail.com>

On Fri, Dec 04, 2020 at 09:58:47AM +0900, Daeho Jeong wrote:
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 87090da8693d..cdf72e153da0 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -803,8 +803,6 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
>  	if (cops->destroy_decompress_ctx)
>  		cops->destroy_decompress_ctx(dic);
>  out_free_dic:
> -	if (verity)
> -		atomic_set(&dic->pending_pages, dic->nr_cpages);
>  	if (!verity)
>  		f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
>  								ret, false);
> @@ -1498,6 +1496,8 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
>  	dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
>  	dic->inode = cc->inode;
>  	atomic_set(&dic->pending_pages, cc->nr_cpages);
> +	if (fsverity_active(cc->inode))
> +		atomic_set(&dic->verity_pages, cc->nr_cpages);
>  	dic->cluster_idx = cc->cluster_idx;
>  	dic->cluster_size = cc->cluster_size;
>  	dic->log_cluster_size = cc->log_cluster_size;

The check for fsverity_active() is wrong.  It looks like you need to know
whether the bio needs to go through the fs-verity data verification.  The
correct way to determine that is to check whether STEP_VERITY is enabled in the
bio's bio_post_read_ctx.  It's set by f2fs_grab_read_bio() when needed.

- Eric

  reply	other threads:[~2020-12-04  3:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04  0:58 Daeho Jeong
2020-12-04  3:28 ` Eric Biggers [this message]
2020-12-04  3:43   ` [f2fs-dev] " Daeho Jeong
2020-12-04  4:01     ` Eric Biggers
2020-12-04  4:31       ` Daeho Jeong
2020-12-04  4:48         ` Daeho Jeong
2020-12-04  4:51           ` Eric Biggers
2020-12-04  5:00             ` Daeho Jeong
2020-12-04  5:18               ` Eric Biggers
2020-12-04  7:01                 ` Daeho Jeong
2020-12-04 18:29                   ` Jaegeuk Kim
2020-12-05  3:40                     ` Daeho Jeong

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