From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79E51274B46; Sat, 12 Sep 2026 19:07:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240071; cv=none; b=AlQE3VeDpjzKF9crmehQhnTIgW+/IMfTur2kYWPS/l/sEDVBv8grPvIQS/LehZAzW5bAvvG7Ir/2DlVg4i7hXc/OPTw1Avmc38Tn1uZ1tPFXYyXauC57vkIw94ZYTFlkTfNg+09YC9jBCBzDyydw/n2EfCfC3a5n0Zc8JhJPTZc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240071; c=relaxed/simple; bh=3BHlqqlOkKJUhrH9JoTp/tUVQHaqXgNntWjqjgkm0cQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jtI+IZWNjYOKeovY7lEmg5Dwzvx6iqhNSaSTM9JReVz3uoky6jCqcs8sle7ZDe3ZdCuOV/STr6vBIeJDIw80ZNuOJIrTn8kap/eAHoEIBmd6ch5+m4RkqapBnkRmVJDoeDs6Bg9JJDp2mxE10PrQkJP8I6cIYbzZlh84a2NAbtE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=g82MxUDM; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="g82MxUDM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32A541F000FF; Sat, 12 Sep 2026 19:07:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789240069; bh=qJKkM1aKjxGCyMmz5G1MD7rZ74MHbbi7anQ8rM9ailg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=g82MxUDM9vitAr+cNI1oH1cUQymgB56ihdB5ToGTM8nhDTpRQJ5LtnZnNPtR0C0Zc 7aBYze48vi/wFCkOHJ8IMBW9hD4QUI8TYJHA0QrxvDaw+3b8dToKOLiWO0e1vLFvaL nyspddRGS3Faas7beT1Fi5lDcGcD7okjDnwFT0J0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhihao Cheng , Richard Weinberger , Sasha Levin Subject: [PATCH 5.15 793/935] ubi: fastmap: Add fastmap control support for UBI_IOCATT ioctl Date: Sat, 12 Sep 2026 09:03:43 +0200 Message-ID: <20260912065545.021294046@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhihao Cheng [ Upstream commit 669d204469c46e91d99da24914130f78277a71d3 ] [1] suggests that fastmap is suitable for large flash devices. Module parameter 'fm_autoconvert' is a coarse grained switch to enable all ubi devices to generate fastmap, which may turn on fastmap even for small flash devices. This patch imports a new field 'disable_fm' in struct 'ubi_attach_req' to support following situations by ioctl 'UBI_IOCATT'. [old functions] A. Disable 'fm_autoconvert': Disbable fastmap for all ubi devices B. Enable 'fm_autoconvert': Enable fastmap for all ubi devices [new function] C. Enable 'fm_autoconvert', set 'disable_fm' for given device: Don't create new fastmap and do full scan (existed fastmap will be destroyed) for the given ubi device. A simple test case in [2]. [1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_fastmap [2] https://bugzilla.kernel.org/show_bug.cgi?id=216278 Signed-off-by: Zhihao Cheng Signed-off-by: Richard Weinberger Stable-dep-of: 5b0a6b554e12 ("ubi: Fix rollback for explicit UBI device numbers") Signed-off-by: Sasha Levin --- drivers/mtd/ubi/build.c | 14 ++++++++++---- drivers/mtd/ubi/cdev.c | 2 +- drivers/mtd/ubi/ubi.h | 3 ++- include/uapi/mtd/ubi-user.h | 8 +++++++- 4 files changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index 8b247ce73bb6e..6fbd77dc1d18f 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -823,6 +823,7 @@ static int autoresize(struct ubi_device *ubi, int vol_id) * @ubi_num: number to assign to the new UBI device * @vid_hdr_offset: VID header offset * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs + * @disable_fm: whether disable fastmap * * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in @@ -830,11 +831,15 @@ static int autoresize(struct ubi_device *ubi, int vol_id) * automatically. Returns the new UBI device number in case of success and a * negative error code in case of failure. * + * If @disable_fm is true, ubi doesn't create new fastmap even the module param + * 'fm_autoconvert' is set, and existed old fastmap will be destroyed after + * doing full scanning. + * * Note, the invocations of this function has to be serialized by the * @ubi_devices_mutex. */ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, - int vid_hdr_offset, int max_beb_per1024) + int vid_hdr_offset, int max_beb_per1024, bool disable_fm) { struct ubi_device *ubi; int i, err; @@ -944,7 +949,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, UBI_FM_MIN_POOL_SIZE); ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; - ubi->fm_disabled = !fm_autoconvert; + ubi->fm_disabled = (!fm_autoconvert || disable_fm) ? 1 : 0; if (fm_debug) ubi_enable_dbg_chk_fastmap(ubi); @@ -985,7 +990,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, if (!ubi->fm_buf) goto out_free; #endif - err = ubi_attach(ubi, 0); + err = ubi_attach(ubi, disable_fm ? 1 : 0); if (err) { ubi_err(ubi, "failed to attach mtd%d, error %d", mtd->index, err); @@ -1265,7 +1270,8 @@ static int __init ubi_init(void) mutex_lock(&ubi_devices_mutex); err = ubi_attach_mtd_dev(mtd, p->ubi_num, - p->vid_hdr_offs, p->max_beb_per1024); + p->vid_hdr_offs, p->max_beb_per1024, + false); mutex_unlock(&ubi_devices_mutex); if (err < 0) { pr_err("UBI error: cannot attach mtd%d\n", diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c index 1d3bbcfb4bb59..f43430b9c1e65 100644 --- a/drivers/mtd/ubi/cdev.c +++ b/drivers/mtd/ubi/cdev.c @@ -1041,7 +1041,7 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, */ mutex_lock(&ubi_devices_mutex); err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, - req.max_beb_per1024); + req.max_beb_per1024, !!req.disable_fm); mutex_unlock(&ubi_devices_mutex); if (err < 0) put_mtd_device(mtd); diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index 589221981524a..80d23e05a7a49 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -938,7 +938,8 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, /* build.c */ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, - int vid_hdr_offset, int max_beb_per1024); + int vid_hdr_offset, int max_beb_per1024, + bool disable_fm); int ubi_detach_mtd_dev(int ubi_num, int anyway); struct ubi_device *ubi_get_device(int ubi_num); void ubi_put_device(struct ubi_device *ubi); diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h index b69e9ba6742b9..dcb179de43585 100644 --- a/include/uapi/mtd/ubi-user.h +++ b/include/uapi/mtd/ubi-user.h @@ -247,6 +247,7 @@ enum { * @vid_hdr_offset: VID header offset (use defaults if %0) * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs * @padding: reserved for future, not used, has to be zeroed + * @disable_fm: whether disable fastmap * * This data structure is used to specify MTD device UBI has to attach and the * parameters it has to use. The number which should be assigned to the new UBI @@ -281,13 +282,18 @@ enum { * eraseblocks for new bad eraseblocks, but attempts to use available * eraseblocks (if any). The accepted range is 0-768. If 0 is given, the * default kernel value of %CONFIG_MTD_UBI_BEB_LIMIT will be used. + * + * If @disable_fm is not zero, ubi doesn't create new fastmap even the module + * param 'fm_autoconvert' is set, and existed old fastmap will be destroyed + * after doing full scanning. */ struct ubi_attach_req { __s32 ubi_num; __s32 mtd_num; __s32 vid_hdr_offset; __s16 max_beb_per1024; - __s8 padding[10]; + __s8 disable_fm; + __s8 padding[9]; }; /* -- 2.53.0