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Message-ID: <20110527162013.GR11023@google.com>
Date: Fri, 27 May 2011 09:20:13 -0700
From: Mandeep Singh Baines <msb@...omium.org>
To: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: jaxboe@...ionio.com, snitzer@...hat.com, msb@...omium.org,
linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: [PATCH 3/3] block: Move discard and secure discard flags to
queue limits
Martin K. Petersen (martin.petersen@...cle.com) wrote:
> Whether a device supports discard is currently stored two places:
> max_discard_sectors in the queue limits and the discard request_queue
> flag. Deprecate the queue flag and always use the topology.
>
> Also move the secure discard flag to the queue limits so it can be
> stacked as well.
>
> Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
> ---
> block/blk-settings.c | 3 +++
> drivers/block/brd.c | 1 -
> drivers/md/dm-table.c | 5 -----
> drivers/mmc/card/queue.c | 4 +---
> drivers/mtd/mtd_blkdevs.c | 4 +---
> drivers/scsi/sd.c | 3 +--
> include/linux/blkdev.h | 21 +++++++++++++--------
> 7 files changed, 19 insertions(+), 22 deletions(-)
>
> diff --git a/block/blk-settings.c b/block/blk-settings.c
> index f95760d..feb3e40 100644
> --- a/block/blk-settings.c
> +++ b/block/blk-settings.c
> @@ -118,6 +118,7 @@ void blk_set_default_limits(struct queue_limits *lim)
> lim->discard_alignment = 0;
> lim->discard_misaligned = 0;
> lim->discard_zeroes_data = 0;
> + lim->discard_secure = 0;
> lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
> lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT);
> lim->alignment_offset = 0;
> @@ -144,6 +145,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
> lim->max_hw_sectors = INT_MAX;
> lim->max_sectors = BLK_DEF_MAX_SECTORS;
> lim->discard_zeroes_data = 1;
> + lim->discard_secure = 1;
> lim->non_rotational = 1;
> }
> EXPORT_SYMBOL(blk_set_stacking_limits);
> @@ -570,6 +572,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
>
> t->cluster &= b->cluster;
> t->discard_zeroes_data &= b->discard_zeroes_data;
> + t->discard_secure &= b->discard_secure;
> t->non_rotational &= b->non_rotational;
>
> /* Physical block size a multiple of the logical block size? */
> diff --git a/drivers/block/brd.c b/drivers/block/brd.c
> index b7f51e4..3ade4e1 100644
> --- a/drivers/block/brd.c
> +++ b/drivers/block/brd.c
> @@ -489,7 +489,6 @@ static struct brd_device *brd_alloc(int i)
> brd->brd_queue->limits.discard_granularity = PAGE_SIZE;
> brd->brd_queue->limits.max_discard_sectors = UINT_MAX;
> brd->brd_queue->limits.discard_zeroes_data = 1;
> - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, brd->brd_queue);
>
> disk = brd->brd_disk = alloc_disk(1 << part_shift);
> if (!disk)
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 35792bf..b5c6a1b 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -1185,11 +1185,6 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
> */
> q->limits = *limits;
>
> - if (!dm_table_supports_discards(t))
You've removed the only caller of dm_table_supports_discards here.
So you should be able to remove it also.
> - queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
> - else
> - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
> -
> dm_table_set_integrity(t);
>
> /*
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index 9adce86..b5c11a0 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -129,7 +129,6 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
> blk_queue_prep_rq(mq->queue, mmc_prep_request);
> blk_queue_non_rotational(mq->queue);
> if (mmc_can_erase(card)) {
> - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mq->queue);
> mq->queue->limits.max_discard_sectors = UINT_MAX;
> if (card->erased_byte == 0)
> mq->queue->limits.discard_zeroes_data = 1;
> @@ -140,8 +139,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
> card->erase_size << 9;
> }
> if (mmc_can_secure_erase_trim(card))
> - queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD,
> - mq->queue);
> + mq->queue->limits.discard_secure = 1;
> }
>
> #ifdef CONFIG_MMC_BLOCK_BOUNCE
> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> index a534e1f..5315163 100644
> --- a/drivers/mtd/mtd_blkdevs.c
> +++ b/drivers/mtd/mtd_blkdevs.c
> @@ -408,10 +408,8 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
> new->rq->queuedata = new;
> blk_queue_logical_block_size(new->rq, tr->blksize);
>
> - if (tr->discard) {
> - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq);
> + if (tr->discard)
> new->rq->limits.max_discard_sectors = UINT_MAX;
> - }
>
> gd->queue = new->rq;
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 7a5cf28..c958ac5 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -499,7 +499,7 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
>
> case SD_LBP_DISABLE:
> q->limits.max_discard_sectors = 0;
> - queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
> + max_blocks = 0;
> return;
>
> case SD_LBP_UNMAP:
> @@ -521,7 +521,6 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
> }
>
> q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
> - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
>
> sdkp->provisioning_mode = mode;
> }
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 52a3f4c..42a374f 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -258,7 +258,7 @@ struct queue_limits {
> unsigned char discard_misaligned;
> unsigned char cluster;
> unsigned char discard_zeroes_data;
> -
> + unsigned char discard_secure;
> unsigned char non_rotational;
> };
>
> @@ -399,10 +399,8 @@ struct request_queue
> #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
> #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
> #define QUEUE_FLAG_IO_STAT 12 /* do IO stats */
> -#define QUEUE_FLAG_DISCARD 13 /* supports DISCARD */
> -#define QUEUE_FLAG_NOXMERGES 14 /* No extended merges */
> -#define QUEUE_FLAG_ADD_RANDOM 15 /* Contributes to random pool */
> -#define QUEUE_FLAG_SECDISCARD 16 /* supports SECDISCARD */
> +#define QUEUE_FLAG_NOXMERGES 13 /* No extended merges */
> +#define QUEUE_FLAG_ADD_RANDOM 14 /* Contributes to random pool */
>
> #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
> (1 << QUEUE_FLAG_STACKABLE) | \
> @@ -483,9 +481,6 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
> #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
> #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_secdiscard(q) (blk_queue_discard(q) && \
> - test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
>
> #define blk_noretry_request(rq) \
> ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
> @@ -1033,6 +1028,16 @@ static inline unsigned int blk_queue_nonrot(struct request_queue *q)
> return q->limits.non_rotational;
> }
>
> +static inline unsigned int blk_queue_discard(struct request_queue *q)
> +{
> + return !!q->limits.max_discard_sectors;
> +}
> +
> +static inline unsigned int blk_queue_secdiscard(struct request_queue *q)
> +{
> + return q->limits.discard_secure;
> +}
> +
> static inline int queue_alignment_offset(struct request_queue *q)
> {
> if (q->limits.misaligned)
> --
> 1.7.4.4
>
--
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