linux-kernel - [PATCH 5.17 0881/1126] btrfs: make search_csum

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Message-Id: <20220405070433.389330361@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:27:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Boris Burkov <boris@....io>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 0881/1126] btrfs: make search_csum_tree return 0 if we get -EFBIG

From: Josef Bacik <josef@...icpanda.com>

[ Upstream commit 03ddb19d2ea745228879b9334f3b550c88acb10a ]

We can either fail to find a csum entry at all and return -ENOENT, or we
can find a range that is close, but return -EFBIG.  In essence these
both mean the same thing when we are doing a lookup for a csum in an
existing range, we didn't find a csum.  We want to treat both of these
errors the same way, complain loudly that there wasn't a csum.  This
currently happens anyway because we do

	count = search_csum_tree();
	if (count <= 0) {
		// reloc and error handling
	}

However it forces us to incorrectly treat EIO or ENOMEM errors as on
disk corruption.  Fix this by returning 0 if we get either -ENOENT or
-EFBIG from btrfs_lookup_csum() so we can do proper error handling.

Reviewed-by: Boris Burkov <boris@....io>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: Josef Bacik <josef@...icpanda.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/btrfs/file-item.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 90c5c38836ab..435c895015a2 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -305,7 +305,7 @@ static int search_csum_tree(struct btrfs_fs_info *fs_info,
 	read_extent_buffer(path->nodes[0], dst, (unsigned long)item,
 			ret * csum_size);
 out:
-	if (ret == -ENOENT)
+	if (ret == -ENOENT || ret == -EFBIG)
 		ret = 0;
 	return ret;
 }
-- 
2.34.1