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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/ubi.h | |
| parent | e7f35da21f6f8c6a8c7d262dd4e4bd32e3083f79 (diff) | |
| download | lwn-669d204469c46e91d99da24914130f78277a71d3.tar.gz lwn-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/ubi.h')
| -rw-r--r-- | drivers/mtd/ubi/ubi.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index 0110eb3d4db6..c8f1bd4fa100 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -937,7 +937,8 @@ 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); |