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| author |   Zhihao Cheng <chengzhihao1@huawei.com> | 2022-08-17 11:27:35 +0800 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2022-09-21 18:29:18 +0200 |
| commit | 669d204469c46e91d99da24914130f78277a71d3 (patch) | |
| tree | 89df41eb05bec3b2e152076e2c9069765983fbab /drivers/mtd/ubi/build.c | |
| parent | ubi: fastmap: Use the bitmap API to allocate bitmaps (diff) | |
| download | linux-dev-669d204469c46e91d99da24914130f78277a71d3.tar.xz linux-dev-669d204469c46e91d99da24914130f78277a71d3.zip | |
ubi: fastmap: Add fastmap control support for 'UBI_IOCATT' ioctl
[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 <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd/ubi/build.c')
| -rw-r--r-- | drivers/mtd/ubi/build.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index a32050fecabf..a901f8edfa41 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -807,6 +807,7 @@ 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 @@ -814,11 +815,15 @@ 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; @@ -921,7 +926,7 @@ 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); @@ -962,7 +967,7 @@ 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); @@ -1242,7 +1247,8 @@ 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", |