[dm-devel] [PATCH 06/11] dm-zoned: remove 'dev' argument from reclaim
Damien Le Moal
Damien.LeMoal at wdc.com
Tue Apr 14 06:37:33 UTC 2020
On 2020/04/14 15:34, Hannes Reinecke wrote:
> On 4/10/20 8:43 AM, Damien Le Moal wrote:
>> On 2020/04/09 15:45, Hannes Reinecke wrote:
>>> Use the dmz_zone_to_dev() mapping function to remove the
>>> 'dev' argument from reclaim.
>>>
>>> Signed-off-by: Hannes Reinecke <hare at suse.de>
>>> ---
>>> drivers/md/dm-zoned-metadata.c | 5 +++
>>> drivers/md/dm-zoned-reclaim.c | 63 +++++++++++++++++-----------------
>>> drivers/md/dm-zoned-target.c | 2 +-
>>> drivers/md/dm-zoned.h | 4 ++-
>>> 4 files changed, 41 insertions(+), 33 deletions(-)
>>>
>>> diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
>>> index 7cda48683c0b..cd4a8093da24 100644
>>> --- a/drivers/md/dm-zoned-metadata.c
>>> +++ b/drivers/md/dm-zoned-metadata.c
>>> @@ -267,6 +267,11 @@ const char *dmz_metadata_label(struct dmz_metadata *zmd)
>>> return (const char *)zmd->devname;
>>> }
>>>
>>> +bool dmz_check_dev(struct dmz_metadata *zmd)
>>> +{
>>> + return dmz_check_bdev(&zmd->dev[0]);
>>> +}
>>> +
>>> /*
>>> * Lock/unlock mapping table.
>>> * The map lock also protects all the zone lists.
>>> diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
>>> index 699c4145306e..102e0686542a 100644
>>> --- a/drivers/md/dm-zoned-reclaim.c
>>> +++ b/drivers/md/dm-zoned-reclaim.c
>>> @@ -13,7 +13,6 @@
>>>
>>> struct dmz_reclaim {
>>> struct dmz_metadata *metadata;
>>> - struct dmz_dev *dev;
>>>
>>> struct delayed_work work;
>>> struct workqueue_struct *wq;
>>> @@ -59,6 +58,7 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
>>> sector_t block)
>>> {
>>> struct dmz_metadata *zmd = zrc->metadata;
>>> + struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
>>> sector_t wp_block = zone->wp_block;
>>> unsigned int nr_blocks;
>>> int ret;
>>> @@ -74,15 +74,15 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
>>> * pointer and the requested position.
>>> */
>>> nr_blocks = block - wp_block;
>>> - ret = blkdev_issue_zeroout(zrc->dev->bdev,
>>> + ret = blkdev_issue_zeroout(dev->bdev,
>>> dmz_start_sect(zmd, zone) + dmz_blk2sect(wp_block),
>>> dmz_blk2sect(nr_blocks), GFP_NOIO, 0);
>>> if (ret) {
>>> - dmz_dev_err(zrc->dev,
>>> + dmz_dev_err(dev,
>>> "Align zone %u wp %llu to %llu (wp+%u) blocks failed %d",
>>> zone->id, (unsigned long long)wp_block,
>>> (unsigned long long)block, nr_blocks, ret);
>>> - dmz_check_bdev(zrc->dev);
>>> + dmz_check_bdev(dev);
>>> return ret;
>>> }
>>>
>>> @@ -116,7 +116,7 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
>>> struct dm_zone *src_zone, struct dm_zone *dst_zone)
>>> {
>>> struct dmz_metadata *zmd = zrc->metadata;
>>> - struct dmz_dev *dev = zrc->dev;
>>> + struct dmz_dev *src_dev, *dst_dev;
>>> struct dm_io_region src, dst;
>>> sector_t block = 0, end_block;
>>> sector_t nr_blocks;
>>> @@ -130,13 +130,17 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
>>> else
>>> end_block = dmz_zone_nr_blocks(zmd);
>>> src_zone_block = dmz_start_block(zmd, src_zone);
>>> + src_dev = dmz_zone_to_dev(zmd, src_zone);
>>> dst_zone_block = dmz_start_block(zmd, dst_zone);
>>> + dst_dev = dmz_zone_to_dev(zmd, dst_zone);
>>>
>>> if (dmz_is_seq(dst_zone))
>>> set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
>>>
>>> while (block < end_block) {
>>> - if (dev->flags & DMZ_BDEV_DYING)
>>> + if (src_dev->flags & DMZ_BDEV_DYING)
>>> + return -EIO;
>>> + if (dst_dev->flags & DMZ_BDEV_DYING)
>>> return -EIO;
>>>
>>> /* Get a valid region from the source zone */
>>> @@ -156,11 +160,11 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
>>> return ret;
>>> }
>>>
>>> - src.bdev = dev->bdev;
>>> + src.bdev = src_dev->bdev;
>>> src.sector = dmz_blk2sect(src_zone_block + block);
>>> src.count = dmz_blk2sect(nr_blocks);
>>>
>>> - dst.bdev = dev->bdev;
>>> + dst.bdev = dst_dev->bdev;
>>> dst.sector = dmz_blk2sect(dst_zone_block + block);
>>> dst.count = src.count;
>>>
>>> @@ -194,10 +198,10 @@ static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone)
>>> struct dmz_metadata *zmd = zrc->metadata;
>>> int ret;
>>>
>>> - dmz_dev_debug(zrc->dev,
>>> - "Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
>>> - dzone->chunk, bzone->id, dmz_weight(bzone),
>>> - dzone->id, dmz_weight(dzone));
>>> + DMDEBUG("(%s): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
>>> + dmz_metadata_label(zmd),
>>> + dzone->chunk, bzone->id, dmz_weight(bzone),
>>> + dzone->id, dmz_weight(dzone));
>>>
>>> /* Flush data zone into the buffer zone */
>>> ret = dmz_reclaim_copy(zrc, bzone, dzone);
>>> @@ -233,10 +237,10 @@ static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
>>> struct dmz_metadata *zmd = zrc->metadata;
>>> int ret = 0;
>>>
>>> - dmz_dev_debug(zrc->dev,
>>> - "Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
>>> - chunk, dzone->id, dmz_weight(dzone),
>>> - bzone->id, dmz_weight(bzone));
>>> + DMDEBUG("(%s): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
>>> + dmz_metadata_label(zmd),
>>> + chunk, dzone->id, dmz_weight(dzone),
>>> + bzone->id, dmz_weight(bzone));
>>>
>>> /* Flush data zone into the buffer zone */
>>> ret = dmz_reclaim_copy(zrc, dzone, bzone);
>>> @@ -285,9 +289,9 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
>>> if (!szone)
>>> return -ENOSPC;
>>>
>>> - dmz_dev_debug(zrc->dev,
>>> - "Chunk %u, move rnd zone %u (weight %u) to seq zone %u",
>>> - chunk, dzone->id, dmz_weight(dzone), szone->id);
>>> + DMDEBUG("(%s): Chunk %u, move rnd zone %u (weight %u) to seq zone %u",
>>> + dmz_metadata_label(zmd),
>>> + chunk, dzone->id, dmz_weight(dzone), szone->id);
>>>
>>> /* Flush the random data zone into the sequential zone */
>>> ret = dmz_reclaim_copy(zrc, dzone, szone);
>>> @@ -343,6 +347,7 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
>>> struct dmz_metadata *zmd = zrc->metadata;
>>> struct dm_zone *dzone;
>>> struct dm_zone *rzone;
>>> + struct dmz_dev *dev;
>>> unsigned long start;
>>> int ret;
>>>
>>> @@ -352,7 +357,7 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
>>> return PTR_ERR(dzone);
>>>
>>> start = jiffies;
>>> -
>>> + dev = dmz_zone_to_dev(zmd, dzone);
>>> if (dmz_is_rnd(dzone)) {
>>> if (!dmz_weight(dzone)) {
>>> /* Empty zone */
>>> @@ -400,14 +405,14 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
>>>
>>> ret = dmz_flush_metadata(zrc->metadata);
>>> if (ret) {
>>> - dmz_dev_debug(zrc->dev,
>>> - "Metadata flush for zone %u failed, err %d\n",
>>> - rzone->id, ret);
>>> + DMDEBUG("(%s): Metadata flush for zone %u failed, err %d\n",
>>> + dmz_metadata_label(zmd), rzone->id, ret);
>>> return ret;
>>> }
>>>
>>> - dmz_dev_debug(zrc->dev, "Reclaimed zone %u in %u ms",
>>> - rzone->id, jiffies_to_msecs(jiffies - start));
>>> + DMDEBUG("(%s): Reclaimed zone %u in %u ms",
>>> + dmz_metadata_label(zmd),
>>> + rzone->id, jiffies_to_msecs(jiffies - start));
>>> return 0;
>>> }
>>>
>>> @@ -455,9 +460,6 @@ static void dmz_reclaim_work(struct work_struct *work)
>>> unsigned int p_unmap_rnd;
>>> int ret;
>>>
>>> - if (dmz_bdev_is_dying(zrc->dev))
>>> - return;
>>> -
>>
>> Why do you remove this ? We should not try to start reclaim if the device is
>> alreaady marked as dying.
Ah. Yes, of course. We could simplify though: any one of the 2 device marked as
dying equal a dying dmzoned target. We do not need to know which drive.
>>
> Because when moving to several devices we wouldn't know which device to
> check at this point.
> But we could replace it with dmz_check_dev() like I did below.
>
> Will be updating it for the next round.
>
> Cheers,
>
> Hannes
>
--
Damien Le Moal
Western Digital Research
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