Hi,
On Fri, Mar 22 2013, Subhash Jadavani wrote:
> On 3/20/2013 5:28 PM, Yaniv Gardi wrote:
>> This patch adds a method to trigger Sanitize command to MMC.
>> The Sanitize command is used for deleting the unmapped memory region
>> of the MMC device.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
>>
>> diff --git a/mmc.c b/mmc.c
>> index a2de863..174d9a4 100644
>> --- a/mmc.c
>> +++ b/mmc.c
>> @@ -90,6 +90,11 @@ static struct Command commands[] = {
>> "Permanently disable the eMMC H/W Reset feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.",
>> NULL
>> },
>> + { do_sanitize, -1,
>> + "sanitize", "<device>\n"
>> + "Send Sanitize command to the <device>.\nThis will delete the unmapped memory region of the device",
>> + NULL
>> + },
>> { 0, 0, 0, 0 }
>> };
>> diff --git a/mmc.h b/mmc.h
>> index c863751..5173d34 100644
>> --- a/mmc.h
>> +++ b/mmc.h
>> @@ -38,6 +38,7 @@
>> #define EXT_CSD_PART_CONFIG 179
>> #define EXT_CSD_BOOT_WP 173
>> #define EXT_CSD_WR_REL_PARAM 166
>> +#define EXT_CSD_SANITIZE_START 165
>> #define EXT_CSD_BKOPS_EN 163 /* R/W */
>> #define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
>> #define EXT_CSD_NATIVE_SECTOR_SIZE 63 /* R */
>> diff --git a/mmc_cmds.c b/mmc_cmds.c
>> index b407f65..5473a20 100644
>> --- a/mmc_cmds.c
>> +++ b/mmc_cmds.c
>> @@ -767,3 +767,31 @@ int do_read_extcsd(int nargs, char **argv)
>> out_free:
>> return ret;
>> }
>> +
>> +int do_sanitize(int nargs, char **argv)
>> +{
>> + int fd, ret;
>> + char *device;
>> +
>> + CHECK(nargs != 2, "Usage: mmc sanitize </path/to/mmcblkX>\n",
>> + exit(1));
>> +
>> + device = argv[1];
>> +
>> + fd = open(device, O_RDWR);
>> + if (fd < 0) {
>> + perror("open");
>> + exit(1);
>> + }
>> +
>> + ret = write_extcsd_value(fd, EXT_CSD_SANITIZE_START, 1);
>> + if (ret) {
>> + fprintf(stderr, "Could not write 0x%02x to EXT_CSD[%d] in %s\n",
>> + 1, EXT_CSD_SANITIZE_START, device);
>> + exit(1);
>> + }
>> +
>
> don't we need to close the opened blkdev file here? or is it done
> somewhere else?
Linux closes open file descriptors on process exit, no?
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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