diff options
| 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 /include/uapi/mtd | |
| parent | e7f35da21f6f8c6a8c7d262dd4e4bd32e3083f79 (diff) | |
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 'include/uapi/mtd')
| -rw-r--r-- | include/uapi/mtd/ubi-user.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h index b69e9ba6742b..dcb179de4358 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]; }; /* |