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-   -   block: Move discard and secure discard flags to queue limits (http://www.linux-archive.org/device-mapper-development/531306-block-move-discard-secure-discard-flags-queue-limits.html)

"Martin K. Petersen" 05-27-2011 02:42 AM

block: Move discard and secure discard flags to queue limits
 
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@oracle.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))
- 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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