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640 lines
15 KiB
640 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2017 Western Digital Corporation or its affiliates. |
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* |
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* This file is released under the GPL. |
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*/ |
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|
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#include "dm-zoned.h" |
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|
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#include <linux/module.h> |
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#define DM_MSG_PREFIX "zoned reclaim" |
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struct dmz_reclaim { |
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struct dmz_metadata *metadata; |
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struct delayed_work work; |
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struct workqueue_struct *wq; |
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struct dm_kcopyd_client *kc; |
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struct dm_kcopyd_throttle kc_throttle; |
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int kc_err; |
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int dev_idx; |
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unsigned long flags; |
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/* Last target access time */ |
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unsigned long atime; |
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}; |
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/* |
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* Reclaim state flags. |
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*/ |
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enum { |
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DMZ_RECLAIM_KCOPY, |
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}; |
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/* |
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* Number of seconds of target BIO inactivity to consider the target idle. |
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*/ |
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#define DMZ_IDLE_PERIOD (10UL * HZ) |
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/* |
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* Percentage of unmapped (free) random zones below which reclaim starts |
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* even if the target is busy. |
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*/ |
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#define DMZ_RECLAIM_LOW_UNMAP_ZONES 30 |
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/* |
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* Percentage of unmapped (free) random zones above which reclaim will |
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* stop if the target is busy. |
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*/ |
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#define DMZ_RECLAIM_HIGH_UNMAP_ZONES 50 |
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|
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/* |
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* Align a sequential zone write pointer to chunk_block. |
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*/ |
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static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone, |
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sector_t block) |
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{ |
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struct dmz_metadata *zmd = zrc->metadata; |
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struct dmz_dev *dev = zone->dev; |
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sector_t wp_block = zone->wp_block; |
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unsigned int nr_blocks; |
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int ret; |
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if (wp_block == block) |
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return 0; |
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if (wp_block > block) |
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return -EIO; |
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/* |
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* Zeroout the space between the write |
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* pointer and the requested position. |
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*/ |
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nr_blocks = block - wp_block; |
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ret = blkdev_issue_zeroout(dev->bdev, |
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dmz_start_sect(zmd, zone) + dmz_blk2sect(wp_block), |
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dmz_blk2sect(nr_blocks), GFP_NOIO, 0); |
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if (ret) { |
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dmz_dev_err(dev, |
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"Align zone %u wp %llu to %llu (wp+%u) blocks failed %d", |
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zone->id, (unsigned long long)wp_block, |
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(unsigned long long)block, nr_blocks, ret); |
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dmz_check_bdev(dev); |
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return ret; |
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} |
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zone->wp_block = block; |
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return 0; |
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} |
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/* |
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* dm_kcopyd_copy end notification. |
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*/ |
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static void dmz_reclaim_kcopy_end(int read_err, unsigned long write_err, |
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void *context) |
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{ |
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struct dmz_reclaim *zrc = context; |
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if (read_err || write_err) |
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zrc->kc_err = -EIO; |
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else |
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zrc->kc_err = 0; |
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clear_bit_unlock(DMZ_RECLAIM_KCOPY, &zrc->flags); |
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smp_mb__after_atomic(); |
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wake_up_bit(&zrc->flags, DMZ_RECLAIM_KCOPY); |
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} |
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/* |
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* Copy valid blocks of src_zone into dst_zone. |
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*/ |
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static int dmz_reclaim_copy(struct dmz_reclaim *zrc, |
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struct dm_zone *src_zone, struct dm_zone *dst_zone) |
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{ |
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struct dmz_metadata *zmd = zrc->metadata; |
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struct dm_io_region src, dst; |
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sector_t block = 0, end_block; |
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sector_t nr_blocks; |
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sector_t src_zone_block; |
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sector_t dst_zone_block; |
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unsigned long flags = 0; |
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int ret; |
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if (dmz_is_seq(src_zone)) |
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end_block = src_zone->wp_block; |
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else |
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end_block = dmz_zone_nr_blocks(zmd); |
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src_zone_block = dmz_start_block(zmd, src_zone); |
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dst_zone_block = dmz_start_block(zmd, dst_zone); |
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if (dmz_is_seq(dst_zone)) |
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set_bit(DM_KCOPYD_WRITE_SEQ, &flags); |
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while (block < end_block) { |
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if (src_zone->dev->flags & DMZ_BDEV_DYING) |
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return -EIO; |
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if (dst_zone->dev->flags & DMZ_BDEV_DYING) |
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return -EIO; |
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if (dmz_reclaim_should_terminate(src_zone)) |
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return -EINTR; |
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/* Get a valid region from the source zone */ |
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ret = dmz_first_valid_block(zmd, src_zone, &block); |
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if (ret <= 0) |
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return ret; |
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nr_blocks = ret; |
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/* |
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* If we are writing in a sequential zone, we must make sure |
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* that writes are sequential. So Zeroout any eventual hole |
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* between writes. |
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*/ |
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if (dmz_is_seq(dst_zone)) { |
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ret = dmz_reclaim_align_wp(zrc, dst_zone, block); |
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if (ret) |
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return ret; |
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} |
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src.bdev = src_zone->dev->bdev; |
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src.sector = dmz_blk2sect(src_zone_block + block); |
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src.count = dmz_blk2sect(nr_blocks); |
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dst.bdev = dst_zone->dev->bdev; |
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dst.sector = dmz_blk2sect(dst_zone_block + block); |
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dst.count = src.count; |
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/* Copy the valid region */ |
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set_bit(DMZ_RECLAIM_KCOPY, &zrc->flags); |
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dm_kcopyd_copy(zrc->kc, &src, 1, &dst, flags, |
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dmz_reclaim_kcopy_end, zrc); |
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/* Wait for copy to complete */ |
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wait_on_bit_io(&zrc->flags, DMZ_RECLAIM_KCOPY, |
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TASK_UNINTERRUPTIBLE); |
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if (zrc->kc_err) |
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return zrc->kc_err; |
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block += nr_blocks; |
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if (dmz_is_seq(dst_zone)) |
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dst_zone->wp_block = block; |
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} |
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return 0; |
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} |
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/* |
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* Move valid blocks of dzone buffer zone into dzone (after its write pointer) |
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* and free the buffer zone. |
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*/ |
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static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone) |
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{ |
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struct dm_zone *bzone = dzone->bzone; |
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sector_t chunk_block = dzone->wp_block; |
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struct dmz_metadata *zmd = zrc->metadata; |
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int ret; |
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DMDEBUG("(%s/%u): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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dzone->chunk, bzone->id, dmz_weight(bzone), |
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dzone->id, dmz_weight(dzone)); |
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/* Flush data zone into the buffer zone */ |
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ret = dmz_reclaim_copy(zrc, bzone, dzone); |
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if (ret < 0) |
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return ret; |
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dmz_lock_flush(zmd); |
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/* Validate copied blocks */ |
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ret = dmz_merge_valid_blocks(zmd, bzone, dzone, chunk_block); |
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if (ret == 0) { |
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/* Free the buffer zone */ |
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dmz_invalidate_blocks(zmd, bzone, 0, dmz_zone_nr_blocks(zmd)); |
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dmz_lock_map(zmd); |
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dmz_unmap_zone(zmd, bzone); |
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dmz_unlock_zone_reclaim(dzone); |
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dmz_free_zone(zmd, bzone); |
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dmz_unlock_map(zmd); |
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} |
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dmz_unlock_flush(zmd); |
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return ret; |
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} |
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/* |
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* Merge valid blocks of dzone into its buffer zone and free dzone. |
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*/ |
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static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone) |
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{ |
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unsigned int chunk = dzone->chunk; |
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struct dm_zone *bzone = dzone->bzone; |
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struct dmz_metadata *zmd = zrc->metadata; |
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int ret = 0; |
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DMDEBUG("(%s/%u): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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chunk, dzone->id, dmz_weight(dzone), |
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bzone->id, dmz_weight(bzone)); |
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/* Flush data zone into the buffer zone */ |
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ret = dmz_reclaim_copy(zrc, dzone, bzone); |
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if (ret < 0) |
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return ret; |
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dmz_lock_flush(zmd); |
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/* Validate copied blocks */ |
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ret = dmz_merge_valid_blocks(zmd, dzone, bzone, 0); |
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if (ret == 0) { |
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/* |
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* Free the data zone and remap the chunk to |
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* the buffer zone. |
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*/ |
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dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd)); |
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dmz_lock_map(zmd); |
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dmz_unmap_zone(zmd, bzone); |
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dmz_unmap_zone(zmd, dzone); |
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dmz_unlock_zone_reclaim(dzone); |
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dmz_free_zone(zmd, dzone); |
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dmz_map_zone(zmd, bzone, chunk); |
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dmz_unlock_map(zmd); |
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} |
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dmz_unlock_flush(zmd); |
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return ret; |
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} |
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/* |
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* Move valid blocks of the random data zone dzone into a free sequential zone. |
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* Once blocks are moved, remap the zone chunk to the sequential zone. |
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*/ |
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static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone) |
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{ |
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unsigned int chunk = dzone->chunk; |
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struct dm_zone *szone = NULL; |
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struct dmz_metadata *zmd = zrc->metadata; |
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int ret; |
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int alloc_flags = DMZ_ALLOC_SEQ; |
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/* Get a free random or sequential zone */ |
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dmz_lock_map(zmd); |
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again: |
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szone = dmz_alloc_zone(zmd, zrc->dev_idx, |
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alloc_flags | DMZ_ALLOC_RECLAIM); |
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if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) { |
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alloc_flags = DMZ_ALLOC_RND; |
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goto again; |
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} |
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dmz_unlock_map(zmd); |
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if (!szone) |
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return -ENOSPC; |
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DMDEBUG("(%s/%u): Chunk %u, move %s zone %u (weight %u) to %s zone %u", |
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dmz_metadata_label(zmd), zrc->dev_idx, chunk, |
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dmz_is_cache(dzone) ? "cache" : "rnd", |
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dzone->id, dmz_weight(dzone), |
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dmz_is_rnd(szone) ? "rnd" : "seq", szone->id); |
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/* Flush the random data zone into the sequential zone */ |
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ret = dmz_reclaim_copy(zrc, dzone, szone); |
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dmz_lock_flush(zmd); |
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if (ret == 0) { |
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/* Validate copied blocks */ |
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ret = dmz_copy_valid_blocks(zmd, dzone, szone); |
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} |
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if (ret) { |
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/* Free the sequential zone */ |
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dmz_lock_map(zmd); |
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dmz_free_zone(zmd, szone); |
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dmz_unlock_map(zmd); |
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} else { |
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/* Free the data zone and remap the chunk */ |
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dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd)); |
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dmz_lock_map(zmd); |
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dmz_unmap_zone(zmd, dzone); |
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dmz_unlock_zone_reclaim(dzone); |
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dmz_free_zone(zmd, dzone); |
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dmz_map_zone(zmd, szone, chunk); |
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dmz_unlock_map(zmd); |
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} |
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dmz_unlock_flush(zmd); |
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return ret; |
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} |
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/* |
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* Reclaim an empty zone. |
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*/ |
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static void dmz_reclaim_empty(struct dmz_reclaim *zrc, struct dm_zone *dzone) |
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{ |
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struct dmz_metadata *zmd = zrc->metadata; |
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dmz_lock_flush(zmd); |
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dmz_lock_map(zmd); |
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dmz_unmap_zone(zmd, dzone); |
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dmz_unlock_zone_reclaim(dzone); |
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dmz_free_zone(zmd, dzone); |
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dmz_unlock_map(zmd); |
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dmz_unlock_flush(zmd); |
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} |
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/* |
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* Test if the target device is idle. |
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*/ |
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static inline int dmz_target_idle(struct dmz_reclaim *zrc) |
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{ |
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return time_is_before_jiffies(zrc->atime + DMZ_IDLE_PERIOD); |
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} |
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/* |
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* Find a candidate zone for reclaim and process it. |
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*/ |
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static int dmz_do_reclaim(struct dmz_reclaim *zrc) |
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{ |
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struct dmz_metadata *zmd = zrc->metadata; |
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struct dm_zone *dzone; |
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struct dm_zone *rzone; |
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unsigned long start; |
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int ret; |
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/* Get a data zone */ |
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dzone = dmz_get_zone_for_reclaim(zmd, zrc->dev_idx, |
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dmz_target_idle(zrc)); |
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if (!dzone) { |
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DMDEBUG("(%s/%u): No zone found to reclaim", |
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dmz_metadata_label(zmd), zrc->dev_idx); |
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return -EBUSY; |
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} |
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rzone = dzone; |
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start = jiffies; |
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if (dmz_is_cache(dzone) || dmz_is_rnd(dzone)) { |
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if (!dmz_weight(dzone)) { |
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/* Empty zone */ |
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dmz_reclaim_empty(zrc, dzone); |
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ret = 0; |
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} else { |
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/* |
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* Reclaim the random data zone by moving its |
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* valid data blocks to a free sequential zone. |
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*/ |
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ret = dmz_reclaim_rnd_data(zrc, dzone); |
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} |
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} else { |
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struct dm_zone *bzone = dzone->bzone; |
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sector_t chunk_block = 0; |
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ret = dmz_first_valid_block(zmd, bzone, &chunk_block); |
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if (ret < 0) |
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goto out; |
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if (ret == 0 || chunk_block >= dzone->wp_block) { |
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/* |
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* The buffer zone is empty or its valid blocks are |
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* after the data zone write pointer. |
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*/ |
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ret = dmz_reclaim_buf(zrc, dzone); |
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rzone = bzone; |
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} else { |
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/* |
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* Reclaim the data zone by merging it into the |
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* buffer zone so that the buffer zone itself can |
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* be later reclaimed. |
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*/ |
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ret = dmz_reclaim_seq_data(zrc, dzone); |
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} |
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} |
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out: |
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if (ret) { |
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if (ret == -EINTR) |
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DMDEBUG("(%s/%u): reclaim zone %u interrupted", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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rzone->id); |
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else |
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DMDEBUG("(%s/%u): Failed to reclaim zone %u, err %d", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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rzone->id, ret); |
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dmz_unlock_zone_reclaim(dzone); |
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return ret; |
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} |
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ret = dmz_flush_metadata(zrc->metadata); |
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if (ret) { |
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DMDEBUG("(%s/%u): Metadata flush for zone %u failed, err %d", |
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dmz_metadata_label(zmd), zrc->dev_idx, rzone->id, ret); |
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return ret; |
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} |
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DMDEBUG("(%s/%u): Reclaimed zone %u in %u ms", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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rzone->id, jiffies_to_msecs(jiffies - start)); |
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return 0; |
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} |
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static unsigned int dmz_reclaim_percentage(struct dmz_reclaim *zrc) |
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{ |
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struct dmz_metadata *zmd = zrc->metadata; |
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unsigned int nr_cache = dmz_nr_cache_zones(zmd); |
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unsigned int nr_unmap, nr_zones; |
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if (nr_cache) { |
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nr_zones = nr_cache; |
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nr_unmap = dmz_nr_unmap_cache_zones(zmd); |
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} else { |
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nr_zones = dmz_nr_rnd_zones(zmd, zrc->dev_idx); |
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nr_unmap = dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx); |
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} |
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if (nr_unmap <= 1) |
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return 0; |
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return nr_unmap * 100 / nr_zones; |
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} |
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/* |
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* Test if reclaim is necessary. |
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*/ |
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static bool dmz_should_reclaim(struct dmz_reclaim *zrc, unsigned int p_unmap) |
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{ |
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unsigned int nr_reclaim; |
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nr_reclaim = dmz_nr_rnd_zones(zrc->metadata, zrc->dev_idx); |
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if (dmz_nr_cache_zones(zrc->metadata)) { |
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/* |
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* The first device in a multi-device |
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* setup only contains cache zones, so |
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* never start reclaim there. |
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*/ |
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if (zrc->dev_idx == 0) |
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return false; |
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nr_reclaim += dmz_nr_cache_zones(zrc->metadata); |
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} |
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/* Reclaim when idle */ |
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if (dmz_target_idle(zrc) && nr_reclaim) |
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return true; |
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/* If there are still plenty of cache zones, do not reclaim */ |
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if (p_unmap >= DMZ_RECLAIM_HIGH_UNMAP_ZONES) |
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return false; |
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/* |
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* If the percentage of unmapped cache zones is low, |
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* reclaim even if the target is busy. |
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*/ |
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return p_unmap <= DMZ_RECLAIM_LOW_UNMAP_ZONES; |
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} |
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|
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/* |
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* Reclaim work function. |
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*/ |
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static void dmz_reclaim_work(struct work_struct *work) |
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{ |
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struct dmz_reclaim *zrc = container_of(work, struct dmz_reclaim, work.work); |
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struct dmz_metadata *zmd = zrc->metadata; |
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unsigned int p_unmap; |
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int ret; |
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if (dmz_dev_is_dying(zmd)) |
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return; |
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p_unmap = dmz_reclaim_percentage(zrc); |
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if (!dmz_should_reclaim(zrc, p_unmap)) { |
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mod_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD); |
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return; |
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} |
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|
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/* |
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* We need to start reclaiming random zones: set up zone copy |
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* throttling to either go fast if we are very low on random zones |
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* and slower if there are still some free random zones to avoid |
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* as much as possible to negatively impact the user workload. |
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*/ |
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if (dmz_target_idle(zrc) || p_unmap < DMZ_RECLAIM_LOW_UNMAP_ZONES / 2) { |
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/* Idle or very low percentage: go fast */ |
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zrc->kc_throttle.throttle = 100; |
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} else { |
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/* Busy but we still have some random zone: throttle */ |
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zrc->kc_throttle.throttle = min(75U, 100U - p_unmap / 2); |
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} |
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DMDEBUG("(%s/%u): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)", |
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dmz_metadata_label(zmd), zrc->dev_idx, |
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zrc->kc_throttle.throttle, |
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(dmz_target_idle(zrc) ? "Idle" : "Busy"), |
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p_unmap, dmz_nr_unmap_cache_zones(zmd), |
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dmz_nr_cache_zones(zmd), |
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dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx), |
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dmz_nr_rnd_zones(zmd, zrc->dev_idx)); |
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ret = dmz_do_reclaim(zrc); |
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if (ret && ret != -EINTR) { |
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if (!dmz_check_dev(zmd)) |
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return; |
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} |
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|
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dmz_schedule_reclaim(zrc); |
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} |
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|
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/* |
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* Initialize reclaim. |
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*/ |
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int dmz_ctr_reclaim(struct dmz_metadata *zmd, |
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struct dmz_reclaim **reclaim, int idx) |
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{ |
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struct dmz_reclaim *zrc; |
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int ret; |
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zrc = kzalloc(sizeof(struct dmz_reclaim), GFP_KERNEL); |
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if (!zrc) |
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return -ENOMEM; |
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|
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zrc->metadata = zmd; |
|
zrc->atime = jiffies; |
|
zrc->dev_idx = idx; |
|
|
|
/* Reclaim kcopyd client */ |
|
zrc->kc = dm_kcopyd_client_create(&zrc->kc_throttle); |
|
if (IS_ERR(zrc->kc)) { |
|
ret = PTR_ERR(zrc->kc); |
|
zrc->kc = NULL; |
|
goto err; |
|
} |
|
|
|
/* Reclaim work */ |
|
INIT_DELAYED_WORK(&zrc->work, dmz_reclaim_work); |
|
zrc->wq = alloc_ordered_workqueue("dmz_rwq_%s_%d", WQ_MEM_RECLAIM, |
|
dmz_metadata_label(zmd), idx); |
|
if (!zrc->wq) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
*reclaim = zrc; |
|
queue_delayed_work(zrc->wq, &zrc->work, 0); |
|
|
|
return 0; |
|
err: |
|
if (zrc->kc) |
|
dm_kcopyd_client_destroy(zrc->kc); |
|
kfree(zrc); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Terminate reclaim. |
|
*/ |
|
void dmz_dtr_reclaim(struct dmz_reclaim *zrc) |
|
{ |
|
cancel_delayed_work_sync(&zrc->work); |
|
destroy_workqueue(zrc->wq); |
|
dm_kcopyd_client_destroy(zrc->kc); |
|
kfree(zrc); |
|
} |
|
|
|
/* |
|
* Suspend reclaim. |
|
*/ |
|
void dmz_suspend_reclaim(struct dmz_reclaim *zrc) |
|
{ |
|
cancel_delayed_work_sync(&zrc->work); |
|
} |
|
|
|
/* |
|
* Resume reclaim. |
|
*/ |
|
void dmz_resume_reclaim(struct dmz_reclaim *zrc) |
|
{ |
|
queue_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD); |
|
} |
|
|
|
/* |
|
* BIO accounting. |
|
*/ |
|
void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc) |
|
{ |
|
zrc->atime = jiffies; |
|
} |
|
|
|
/* |
|
* Start reclaim if necessary. |
|
*/ |
|
void dmz_schedule_reclaim(struct dmz_reclaim *zrc) |
|
{ |
|
unsigned int p_unmap = dmz_reclaim_percentage(zrc); |
|
|
|
if (dmz_should_reclaim(zrc, p_unmap)) |
|
mod_delayed_work(zrc->wq, &zrc->work, 0); |
|
}
|
|
|