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Message-Id: <20240514-zoned-gc-v1-1-109f1a6c7447@kernel.org>
Date: Tue, 14 May 2024 23:13:21 +0200
From: Johannes Thumshirn <jth@...nel.org>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>
Cc: Hans Holmberg <Hans.Holmberg@....com>, linux-btrfs@...r.kernel.org,
linux-kernel@...r.kernel.org,
Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH 1/2] btrfs: zoned: reserve relocation zone on mount
From: Johannes Thumshirn <johannes.thumshirn@....com>
Reserve one zone as a data relocation target on each mount. If we already
find one empty block group, there's no need to force a chunk allocation,
but we can use this empty data block group as our relocation target.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
fs/btrfs/disk-io.c | 2 ++
fs/btrfs/zoned.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/zoned.h | 3 +++
3 files changed, 65 insertions(+)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a91a8056758a..0490f2f45fb1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3558,6 +3558,8 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
}
btrfs_discard_resume(fs_info);
+ btrfs_reserve_relocation_zone(fs_info);
+
if (fs_info->uuid_root &&
(btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 4cba80b34387..b752f8c95f40 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -17,6 +17,7 @@
#include "fs.h"
#include "accessors.h"
#include "bio.h"
+#include "transaction.h"
/* Maximum number of zones to report per blkdev_report_zones() call */
#define BTRFS_REPORT_NR_ZONES 4096
@@ -2634,3 +2635,62 @@ void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info)
}
spin_unlock(&fs_info->zone_active_bgs_lock);
}
+
+static u64 find_empty_block_group(struct btrfs_space_info *sinfo, u64 flags)
+{
+ struct btrfs_block_group *bg;
+
+ for (int i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
+ list_for_each_entry(bg, &sinfo->block_groups[i], list) {
+ if (bg->flags != flags)
+ continue;
+ if (bg->used == 0)
+ return bg->start;
+ }
+ }
+
+ return 0;
+}
+
+void btrfs_reserve_relocation_zone(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_space_info *sinfo = fs_info->data_sinfo;
+ struct btrfs_trans_handle *trans;
+ u64 flags = btrfs_get_alloc_profile(fs_info, sinfo->flags);
+ u64 bytenr = 0;
+
+ lockdep_assert_not_held(&fs_info->relocation_bg_lock);
+
+ if (!btrfs_is_zoned(fs_info))
+ return;
+
+ bytenr = find_empty_block_group(sinfo, flags);
+ if (!bytenr) {
+ int ret;
+
+ trans = btrfs_join_transaction(tree_root);
+ if (IS_ERR(trans))
+ return;
+
+ ret = btrfs_chunk_alloc(trans, flags, CHUNK_ALLOC_FORCE);
+ btrfs_end_transaction(trans);
+
+ if (!ret) {
+ struct btrfs_block_group *bg;
+
+ bytenr = find_empty_block_group(sinfo, flags);
+ if (!bytenr)
+ goto out;
+ bg = btrfs_lookup_block_group(fs_info, bytenr);
+ ASSERT(bg);
+
+ if (!btrfs_zone_activate(bg))
+ bytenr = 0;
+ btrfs_put_block_group(bg);
+ }
+ }
+
+out:
+ fs_info->data_reloc_bg = bytenr;
+}
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h
index 77c4321e331f..048ffada4549 100644
--- a/fs/btrfs/zoned.h
+++ b/fs/btrfs/zoned.h
@@ -97,6 +97,7 @@ int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info);
int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
struct btrfs_space_info *space_info, bool do_finish);
void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info);
+void btrfs_reserve_relocation_zone(struct btrfs_fs_info *fs_info);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
@@ -271,6 +272,8 @@ static inline int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
static inline void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info) { }
+static inline void btrfs_reserve_relocation_zone(struct btrfs_fs_info *fs_info) { }
+
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
--
2.35.3
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