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UBI: add max_beb_per1024 to attach ioctl

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This patch provides a possibility to set the "maximum expected number of
bad blocks per 1024 blocks" (max_beb_per1024) for each mtd device using
the UBI_IOCATT ioctl.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Richard Genoud 2012-08-20 18:00:15 +02:00 committed by Artem Bityutskiy
parent edac493dfb
commit db7e21c21f
3 changed files with 18 additions and 3 deletions
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3
drivers/mtd/ubi/Kconfig
View File

@ -51,7 +51,8 @@ config MTD_UBI_BEB_LIMIT
MTD partitions of the same size, UBI will reserve 40 eraseblocks when
attaching a partition.
This option can be overridden by the "mtd=" UBI module parameter.
This option can be overridden by the "mtd=" UBI module parameter or
by the "attach" ioctl.
Leave the default value if unsure.

2
drivers/mtd/ubi/cdev.c
View File

@ -1011,7 +1011,7 @@ 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,
CONFIG_MTD_UBI_BEB_LIMIT);
req.max_beb_per1024);
mutex_unlock(&ubi_devices_mutex);
if (err < 0)
put_mtd_device(mtd);

16
include/mtd/ubi-user.h
View File

@ -222,6 +222,7 @@ enum {
* @ubi_num: UBI device number to create
* @mtd_num: MTD device number to attach
* @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
*
* This data structure is used to specify MTD device UBI has to attach and the
@ -245,12 +246,25 @@ enum {
* be 2KiB-64 bytes = 1984. Note, that this position is not even 512-bytes
* aligned, which is OK, as UBI is clever enough to realize this is 4th
* sub-page of the first page and add needed padding.
*
* The @max_beb_per1024 is the maximum amount of bad PEBs UBI expects on the
* UBI device per 1024 eraseblocks. This value is often given in an other form
* in the NAND datasheet (min NVB i.e. minimal number of valid blocks). The
* maximum expected bad eraseblocks per 1024 is then:
* 1024 * (1 - MinNVB / MaxNVB)
* Which gives 20 for most NAND devices. This limit is used in order to derive
* amount of eraseblock UBI reserves for handling new bad blocks. If the device
* has more bad eraseblocks than this limit, UBI does not reserve any physical
* 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.
*/
struct ubi_attach_req {
__s32 ubi_num;
__s32 mtd_num;
__s32 vid_hdr_offset;
__s8 padding[12];
__s16 max_beb_per1024;
__s8 padding[10];
};
/**