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Tue, 03 Feb 2026 09:24:23 -0800 (PST) From: Adarsh Das To: Chris Mason , David Sterba Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, Adarsh Das Subject: [PATCH 1/2] btrfs: handle unexpected exact match in btrfs_set_inode_index_count() Date: Tue, 3 Feb 2026 22:53:56 +0530 Message-ID: <20260203172357.65383-2-adarshdas950@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260203172357.65383-1-adarshdas950@gmail.com> References: <20260203172357.65383-1-adarshdas950@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" We search with offset (u64)-1 which should never match exactly. Previously the code silently returned success without setting the index count. Now logs an error and return -EUCLEAN instead. Signed-off-by: Adarsh Das --- fs/btrfs/inode.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a2b5b440637e..9f46bfff1e4b 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6105,9 +6105,18 @@ static int btrfs_set_inode_index_count(struct btrfs_= inode *inode) ret =3D btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) return ret; - /* FIXME: we should be able to handle this */ - if (ret =3D=3D 0) - return ret; + + if (unlikely(ret =3D=3D 0)) { + /* + * Key with offset -1 found, there would have to exist a dir + * index item with such offset, but this is out of the valid + * range. + */ + btrfs_err(root->fs_info, + "unexpected exact match for dir index key, inode %llu", + btrfs_ino(inode)); + return -EUCLEAN; + } =20 if (path->slots[0] =3D=3D 0) { inode->index_cnt =3D BTRFS_DIR_START_INDEX; --=20 2.53.0