[PATCH 23/27] block: add a bdev_max_discard_sectors helper

[Christoph Hellwig <hch@xxxxxx>]

Add a helper to query the number of sectors support per each discard bio
based on the block device and use this helper to stop various places from
poking into the request_queue to see if discard is supported and if so how
much.  This mirrors what is done e.g. for write zeroes as well.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@xxxxxxxxxx> [drbd]
Acked-by: Coly Li <colyli@xxxxxxx> [bcache]
Acked-by: David Sterba <dsterba@xxxxxxxx> [btrfs]
---
 drivers/block/drbd/drbd_nl.c        | 8 +++++---
 drivers/block/drbd/drbd_receiver.c  | 2 +-
 drivers/block/rnbd/rnbd-srv-dev.h   | 3 +--
 drivers/md/dm-io.c                  | 2 +-
 drivers/target/target_core_device.c | 7 +++----
 fs/f2fs/segment.c                   | 6 ++----
 include/linux/blkdev.h              | 5 +++++
 7 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 4d00986d6f588..a0a06e238e917 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1439,7 +1439,8 @@ static bool write_ordering_changed(struct disk_conf *a, 
struct disk_conf *b)
 static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf 
*disk_conf,
                               struct drbd_backing_dev *nbc)
 {
-       struct request_queue * const q = nbc->backing_bdev->bd_disk->queue;
+       struct block_device *bdev = nbc->backing_bdev;
+       struct request_queue *q = bdev->bd_disk->queue;
 
        if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
                disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
@@ -1455,6 +1456,7 @@ static void sanitize_disk_conf(struct drbd_device 
*device, struct disk_conf *dis
 
        if (disk_conf->rs_discard_granularity) {
                int orig_value = disk_conf->rs_discard_granularity;
+               sector_t discard_size = bdev_max_discard_sectors(bdev) << 9;
                int remainder;
 
                if (q->limits.discard_granularity > 
disk_conf->rs_discard_granularity)
@@ -1463,8 +1465,8 @@ static void sanitize_disk_conf(struct drbd_device 
*device, struct disk_conf *dis
                remainder = disk_conf->rs_discard_granularity % 
q->limits.discard_granularity;
                disk_conf->rs_discard_granularity += remainder;
 
-               if (disk_conf->rs_discard_granularity > 
q->limits.max_discard_sectors << 9)
-                       disk_conf->rs_discard_granularity = 
q->limits.max_discard_sectors << 9;
+               if (disk_conf->rs_discard_granularity > discard_size)
+                       disk_conf->rs_discard_granularity = discard_size;
 
                if (disk_conf->rs_discard_granularity != orig_value)
                        drbd_info(device, "rs_discard_granularity changed to 
%d\n",
diff --git a/drivers/block/drbd/drbd_receiver.c 
b/drivers/block/drbd/drbd_receiver.c
index 08da922f81d1d..0b4c7de463989 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1524,7 +1524,7 @@ int drbd_issue_discard_or_zero_out(struct drbd_device 
*device, sector_t start, u
        granularity = max(q->limits.discard_granularity >> 9, 1U);
        alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
 
-       max_discard_sectors = min(q->limits.max_discard_sectors, (1U << 22));
+       max_discard_sectors = min(bdev_max_discard_sectors(bdev), (1U << 22));
        max_discard_sectors -= max_discard_sectors % granularity;
        if (unlikely(!max_discard_sectors))
                goto zero_out;
diff --git a/drivers/block/rnbd/rnbd-srv-dev.h 
b/drivers/block/rnbd/rnbd-srv-dev.h
index 2c3df02b5e8ec..f82fbb4bbda8e 100644
--- a/drivers/block/rnbd/rnbd-srv-dev.h
+++ b/drivers/block/rnbd/rnbd-srv-dev.h
@@ -52,8 +52,7 @@ static inline int rnbd_dev_get_max_discard_sects(const struct 
rnbd_dev *dev)
        if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
                return 0;
 
-       return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
-                                        REQ_OP_DISCARD);
+       return bdev_max_discard_sectors(dev->bdev);
 }
 
 static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 5762366333a27..e4b95eaeec8c7 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -311,7 +311,7 @@ static void do_region(int op, int op_flags, unsigned region,
         * Reject unsupported discard and write same requests.
         */
        if (op == REQ_OP_DISCARD)
-               special_cmd_max_sectors = q->limits.max_discard_sectors;
+               special_cmd_max_sectors = bdev_max_discard_sectors(where->bdev);
        else if (op == REQ_OP_WRITE_ZEROES)
                special_cmd_max_sectors = q->limits.max_write_zeroes_sectors;
        if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) &&
diff --git a/drivers/target/target_core_device.c 
b/drivers/target/target_core_device.c
index 16e775bcf4a7c..c3e25bac90d59 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -829,9 +829,8 @@ struct se_device *target_alloc_device(struct se_hba *hba, 
const char *name)
 }
 
 /*
- * Check if the underlying struct block_device request_queue supports
- * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
- * in ATA and we need to set TPE=1
+ * Check if the underlying struct block_device supports discard and if yes
+ * configure the UNMAP parameters.
  */
 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
                                       struct block_device *bdev)
@@ -843,7 +842,7 @@ bool target_configure_unmap_from_queue(struct se_dev_attrib 
*attrib,
                return false;
 
        attrib->max_unmap_lba_count =
-               q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
+               bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9);
        /*
         * Currently hardcoded to 1 in Linux/SCSI code..
         */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 22dfeb9915290..71f09adbcba86 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1196,9 +1196,8 @@ static int __submit_discard_cmd(struct f2fs_sb_info *sbi,
                                                unsigned int *issued)
 {
        struct block_device *bdev = dc->bdev;
-       struct request_queue *q = bdev_get_queue(bdev);
        unsigned int max_discard_blocks =
-                       SECTOR_TO_BLOCK(q->limits.max_discard_sectors);
+                       SECTOR_TO_BLOCK(bdev_max_discard_sectors(bdev));
        struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
        struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
                                        &(dcc->fstrim_list) : &(dcc->wait_list);
@@ -1375,9 +1374,8 @@ static void __update_discard_tree_range(struct 
f2fs_sb_info *sbi,
        struct discard_cmd *dc;
        struct discard_info di = {0};
        struct rb_node **insert_p = NULL, *insert_parent = NULL;
-       struct request_queue *q = bdev_get_queue(bdev);
        unsigned int max_discard_blocks =
-                       SECTOR_TO_BLOCK(q->limits.max_discard_sectors);
+                       SECTOR_TO_BLOCK(bdev_max_discard_sectors(bdev));
        block_t end = lstart + len;
 
        dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 34b1cfd067421..ce16247d3afab 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1254,6 +1254,11 @@ bdev_zone_write_granularity(struct block_device *bdev)
 int bdev_alignment_offset(struct block_device *bdev);
 unsigned int bdev_discard_alignment(struct block_device *bdev);
 
+static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
+{
+       return bdev_get_queue(bdev)->limits.max_discard_sectors;
+}
+
 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
 {
        struct request_queue *q = bdev_get_queue(bdev);
-- 
2.30.2