Add MMC erase and secure erase V3

Hi

Add ability to do MMC erase and secure erase operations from userspace,
using the BLKDISCARD ioctl and a newly created BLKSECDISCARD ioctl.

This is version 3 of these patches.

Changes from V2

- move the addition of BLKSECDISCARD to a separate patch and implement it
using I/O requests
- move the MMC support of secure discard to a separate patch and support
the secure discard I/O request

Changes from V1

- use discard I/O requests instead of implementing BLKDISCARD in mmc_block
- do not validate erase size for MMC erases, instead round to erase size
- rename MMC max_erase to pref_erase and expose it through sysfs as
preferred_erase_size


Adrian Hunter (5):
      mmc: Add erase, secure erase, trim and secure trim operations
      mmc_block: Add discard support
      omap_hsmmc: Add erase capability
      block: Add secure discard
      mmc_block: Add support for secure discard

 block/blk-core.c              |    6 +-
 block/blk-lib.c               |    6 +
 block/compat_ioctl.c          |    1 +
 block/elevator.c              |    4 +
 block/ioctl.c                 |   15 ++-
 drivers/mmc/card/block.c      |   82 ++++++++++-
 drivers/mmc/card/queue.c      |   19 ++-
 drivers/mmc/core/core.c       |  346 +++++++++++++++++++++++++++++++++++++++++
 drivers/mmc/core/core.h       |    2 +
 drivers/mmc/core/mmc.c        |   47 ++++++-
 drivers/mmc/core/sd.c         |   82 ++++++++++
 drivers/mmc/core/sd_ops.c     |   48 ++++++
 drivers/mmc/core/sd_ops.h     |    1 +
 drivers/mmc/host/omap_hsmmc.c |   13 ++-
 include/linux/bio.h           |    7 +-
 include/linux/blkdev.h        |   10 +-
 include/linux/fs.h            |    2 +
 include/linux/mmc/card.h      |   19 +++
 include/linux/mmc/core.h      |   19 +++
 include/linux/mmc/host.h      |    1 +
 include/linux/mmc/mmc.h       |   24 ++-
 include/linux/mmc/sd.h        |    5 +
 kernel/trace/blktrace.c       |    8 +
 23 files changed, 746 insertions(+), 21 deletions(-)

 
Regards
Adrian

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