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Date: Mon, 9 Jul 2012 14:07:13 +0530
From: Girish K S <girish.shivananjappa@...aro.org>
To: Yaniv Gardi <ygardi@...eaurora.org>
Cc: linux-mmc@...r.kernel.org, merez@...eaurora.org,
linux-arm-msm@...r.kernel.org,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v7 1/2] block: ioctl support for sanitize in eMMC 4.5
On 28 June 2012 14:02, Yaniv Gardi <ygardi@...eaurora.org> wrote:
> Adding a new ioctl to support sanitize operation in eMMC
> cards version 4.5.
> The sanitize ioctl support helps performing this operation
> via user application.
>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
> block/blk-core.c | 15 ++++++++++--
> block/blk-lib.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
> block/blk-merge.c | 4 +++
> block/elevator.c | 2 +-
> block/ioctl.c | 9 ++++++++
> include/linux/blk_types.h | 5 +++-
> include/linux/blkdev.h | 3 ++
> include/linux/fs.h | 1 +
> kernel/trace/blktrace.c | 2 +
> 9 files changed, 87 insertions(+), 5 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 3c923a7..4a56102b 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -1641,7 +1641,7 @@ generic_make_request_checks(struct bio *bio)
> goto end_io;
> }
>
> - if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
> + if (unlikely(!(bio->bi_rw & (REQ_DISCARD | REQ_SANITIZE)) &&
> nr_sectors > queue_max_hw_sectors(q))) {
> printk(KERN_ERR "bio too big device %s (%u > %u)\n",
> bdevname(bio->bi_bdev, b),
> @@ -1689,6 +1689,14 @@ generic_make_request_checks(struct bio *bio)
> goto end_io;
> }
>
> + if ((bio->bi_rw & REQ_SANITIZE) &&
> + (!blk_queue_sanitize(q))) {
> + pr_info("%s - got a SANITIZE request but the queue "
> + "doesn't support sanitize requests", __func__);
> + err = -EOPNOTSUPP;
> + goto end_io;
> + }
> +
> if (blk_throtl_bio(q, bio))
> return false; /* throttled, will be resubmitted later */
>
> @@ -1794,7 +1802,8 @@ void submit_bio(int rw, struct bio *bio)
> * If it's a regular read/write or a barrier with data attached,
> * go through the normal accounting stuff before submission.
> */
> - if (bio_has_data(bio) && !(rw & REQ_DISCARD)) {
> + if (bio_has_data(bio) &&
> + (!(rw & (REQ_DISCARD | REQ_SANITIZE)))) {
> if (rw & WRITE) {
> count_vm_events(PGPGOUT, count);
> } else {
> @@ -1840,7 +1849,7 @@ EXPORT_SYMBOL(submit_bio);
> */
> int blk_rq_check_limits(struct request_queue *q, struct request *rq)
> {
> - if (rq->cmd_flags & REQ_DISCARD)
> + if (rq->cmd_flags & (REQ_DISCARD | REQ_SANITIZE))
> return 0;
>
> if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
> diff --git a/block/blk-lib.c b/block/blk-lib.c
> index 2b461b4..280d63e 100644
> --- a/block/blk-lib.c
> +++ b/block/blk-lib.c
> @@ -115,6 +115,57 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
> EXPORT_SYMBOL(blkdev_issue_discard);
>
> /**
> + * blkdev_issue_sanitize - queue a sanitize request
> + * @bdev: blockdev to issue sanitize for
> + * @gfp_mask: memory allocation flags (for bio_alloc)
> + *
> + * Description:
> + * Issue a sanitize request for the specified block device
> + */
> +int blkdev_issue_sanitize(struct block_device *bdev, gfp_t gfp_mask)
> +{
> + DECLARE_COMPLETION_ONSTACK(wait);
> + struct request_queue *q = bdev_get_queue(bdev);
> + int type = REQ_WRITE | REQ_SANITIZE;
> + struct bio_batch bb;
> + struct bio *bio;
> + int ret = 0;
> +
> + if (!q)
> + return -ENXIO;
> +
> + if (!blk_queue_sanitize(q)) {
> + pr_err("%s - card doesn't support sanitize", __func__);
> + return -EOPNOTSUPP;
> + }
> +
> + bio = bio_alloc(gfp_mask, 1);
> + if (!bio)
> + return -ENOMEM;
> +
> + atomic_set(&bb.done, 1);
> + bb.flags = 1 << BIO_UPTODATE;
> + bb.wait = &wait;
> +
> + bio->bi_end_io = bio_batch_end_io;
> + bio->bi_bdev = bdev;
> + bio->bi_private = &bb;
> +
> + atomic_inc(&bb.done);
> + submit_bio(type, bio);
> +
> + /* Wait for bios in-flight */
> + if (!atomic_dec_and_test(&bb.done))
> + wait_for_completion(&wait);
> +
> + if (!test_bit(BIO_UPTODATE, &bb.flags))
> + ret = -EIO;
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(blkdev_issue_sanitize);
> +
> +/**
> * blkdev_issue_zeroout - generate number of zero filed write bios
> * @bdev: blockdev to issue
> * @sector: start sector
> diff --git a/block/blk-merge.c b/block/blk-merge.c
> index 160035f..7e24772 100644
> --- a/block/blk-merge.c
> +++ b/block/blk-merge.c
> @@ -477,6 +477,10 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
> if (!rq_mergeable(rq))
> return false;
>
> + /* don't merge file system requests and sanitize requests */
> + if ((req->cmd_flags & REQ_SANITIZE) != (next->cmd_flags & REQ_SANITIZE))
> + return false;
> +
> /* don't merge file system requests and discard requests */
> if ((bio->bi_rw & REQ_DISCARD) != (rq->bio->bi_rw & REQ_DISCARD))
> return false;
> diff --git a/block/elevator.c b/block/elevator.c
> index 6a55d41..91f1de1 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -563,7 +563,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where)
> if (rq->cmd_flags & REQ_SOFTBARRIER) {
> /* barriers are scheduling boundary, update end_sector */
> if (rq->cmd_type == REQ_TYPE_FS ||
> - (rq->cmd_flags & REQ_DISCARD)) {
> + (rq->cmd_flags & (REQ_DISCARD | REQ_SANITIZE))) {
> q->end_sector = rq_end_sector(rq);
> q->boundary_rq = rq;
> }
> diff --git a/block/ioctl.c b/block/ioctl.c
> index ba15b2d..dd76ba0 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> @@ -132,6 +132,11 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
> return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
> }
>
> +static int blk_ioctl_sanitize(struct block_device *bdev)
> +{
> + return blkdev_issue_sanitize(bdev, GFP_KERNEL);
> +}
> +
> static int put_ushort(unsigned long arg, unsigned short val)
> {
> return put_user(val, (unsigned short __user *)arg);
> @@ -234,6 +239,10 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
> set_device_ro(bdev, n);
> return 0;
>
> + case BLKSANITIZE:
> + ret = blk_ioctl_sanitize(bdev);
> + break;
> +
> case BLKDISCARD:
> case BLKSECDISCARD: {
> uint64_t range[2];
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 0edb65d..e58e0db 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -160,6 +160,7 @@ enum rq_flag_bits {
> __REQ_FLUSH_SEQ, /* request for flush sequence */
> __REQ_IO_STAT, /* account I/O stat */
> __REQ_MIXED_MERGE, /* merge of different types, fail separately */
> + __REQ_SANITIZE, /* sanitize */
> __REQ_NR_BITS, /* stops here */
> };
>
> @@ -171,13 +172,15 @@ enum rq_flag_bits {
> #define REQ_META (1 << __REQ_META)
> #define REQ_PRIO (1 << __REQ_PRIO)
> #define REQ_DISCARD (1 << __REQ_DISCARD)
> +#define REQ_SANITIZE (1 << __REQ_SANITIZE)
> #define REQ_NOIDLE (1 << __REQ_NOIDLE)
>
> #define REQ_FAILFAST_MASK \
> (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
> #define REQ_COMMON_MASK \
> (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
> - REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
> + REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE | \
> + REQ_SANITIZE)
> #define REQ_CLONE_MASK REQ_COMMON_MASK
>
> #define REQ_RAHEAD (1 << __REQ_RAHEAD)
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index ba43f40..1db6c91 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -438,6 +438,7 @@ struct request_queue {
> #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
> #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
> #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
> +#define QUEUE_FLAG_SANITIZE 19 /* supports SANITIZE */
>
> #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
> (1 << QUEUE_FLAG_STACKABLE) | \
> @@ -518,6 +519,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
> #define blk_queue_stackable(q) \
> test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
> #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
> +#define blk_queue_sanitize(q) test_bit(QUEUE_FLAG_SANITIZE, &(q)->queue_flags)
> #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
> test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
>
> @@ -971,6 +973,7 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
> extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
> extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
> sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
> +extern int blkdev_issue_sanitize(struct block_device *bdev, gfp_t gfp_mask);
> extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
> sector_t nr_sects, gfp_t gfp_mask);
> static inline int sb_issue_discard(struct super_block *sb, sector_t block,
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index b0a6d44..167c450 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -333,6 +333,7 @@ struct inodes_stat_t {
> #define BLKDISCARDZEROES _IO(0x12,124)
> #define BLKSECDISCARD _IO(0x12,125)
> #define BLKROTATIONAL _IO(0x12,126)
> +#define BLKSANITIZE _IO(0x12, 127)
>
> #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
> #define FIBMAP _IO(0x00,1) /* bmap access */
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index c0bd030..06f7940 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1788,6 +1788,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
> rwbs[i++] = 'W';
> else if (rw & REQ_DISCARD)
> rwbs[i++] = 'D';
> + else if (rw & REQ_SANITIZE)
> + rwbs[i++] = 'Z';
> else if (bytes)
> rwbs[i++] = 'R';
> else
> --
there is a conflict in the macro definition of include/linux/mmc/host.h
for
#define MMC_CAP2_SANITIZE (1 << 10) /* Support Sanitize */
kindly change it to
#define MMC_CAP2_SANITIZE (1 << 12) /* Support Sanitize */
as 10th bit is already in use for other purpose
> 1.7.6
> --
> Sent by a consultant of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum
> --
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