Hi, On Mon, Jan 09 2012, JONGMAN HEO wrote: > Hi all, > Please excuse me, I have some noob question regarding MMC. > > I'd like to erase(discard) certain MMC partition from kernel space > (i.e. kernel module). > I know this is quite ugly design, but I have no choice but to > implement the feature (erasing given MMC partition) within kernel > space for other reasons. > > Assume /dev/mmcblk0p2 needs to be erased. > > First, I tried to use BLKDISCARD ioctl. From user space, it works. > In kernel space, I had to use ugly code, like set_fs(), filp_open(), > etc in order to access "/dev/mmcblk0p2" device. > I stuck at sys_ioctl(), which is not exported symbol so that I > couldn't use the sys_ioctl() from my module for the BLKDISCARD ioctl. > > Alternatively, I want to make a new exported API to execute the > discard request for "/dev/mmcblk0p2" device (like > mmc_test_area_erase() in mmc_test.c). > Here, it seems that I need to get "struct mmc_card *card" instance, > which is a first parameter of mmc_erase(). > > How can I get the "card" instance for current MMC device? Is there any > way to do that? I don't think we'll be interested in helping you with this -- as you say, this is a very ugly design, and we already have the proper userspace solution. - Chris. -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
