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Message-Id: <20220815180511.572995227@linuxfoundation.org>
Date: Mon, 15 Aug 2022 20:07:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Naohiro Aota <naohiro.aota@....com>,
David Sterba <dsterba@...e.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 1028/1095] btrfs: zoned: activate metadata block group on flush_space
From: Naohiro Aota <naohiro.aota@....com>
[ Upstream commit b0931513913633044ed6e3800334c28433c007b0 ]
For metadata space on zoned filesystem, reaching ALLOC_CHUNK{,_FORCE}
means we don't have enough space left in the active_total_bytes. Before
allocating a new chunk, we can try to activate an existing block group
in this case.
Also, allocating a chunk is not enough to grant a ticket for metadata
space on zoned filesystem we need to activate the block group to
increase the active_total_bytes.
btrfs_zoned_activate_one_bg() implements the activation feature. It will
activate a block group by (maybe) finishing a block group. It will give up
activating a block group if it cannot finish any block group.
CC: stable@...r.kernel.org # 5.16+
Fixes: afba2bc036b0 ("btrfs: zoned: implement active zone tracking")
Signed-off-by: Naohiro Aota <naohiro.aota@....com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/btrfs/space-info.c | 30 ++++++++++++++++++++++++
fs/btrfs/zoned.c | 53 +++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/zoned.h | 10 ++++++++
3 files changed, 93 insertions(+)
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index 4867199cf983..104cbc901c0e 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -9,6 +9,7 @@
#include "ordered-data.h"
#include "transaction.h"
#include "block-group.h"
+#include "zoned.h"
/*
* HOW DOES SPACE RESERVATION WORK
@@ -724,6 +725,18 @@ static void flush_space(struct btrfs_fs_info *fs_info,
break;
case ALLOC_CHUNK:
case ALLOC_CHUNK_FORCE:
+ /*
+ * For metadata space on zoned filesystem, reaching here means we
+ * don't have enough space left in active_total_bytes. Try to
+ * activate a block group first, because we may have inactive
+ * block group already allocated.
+ */
+ ret = btrfs_zoned_activate_one_bg(fs_info, space_info, false);
+ if (ret < 0)
+ break;
+ else if (ret == 1)
+ break;
+
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
@@ -734,6 +747,23 @@ static void flush_space(struct btrfs_fs_info *fs_info,
(state == ALLOC_CHUNK) ? CHUNK_ALLOC_NO_FORCE :
CHUNK_ALLOC_FORCE);
btrfs_end_transaction(trans);
+
+ /*
+ * For metadata space on zoned filesystem, allocating a new chunk
+ * is not enough. We still need to activate the block * group.
+ * Active the newly allocated block group by (maybe) finishing
+ * a block group.
+ */
+ if (ret == 1) {
+ ret = btrfs_zoned_activate_one_bg(fs_info, space_info, true);
+ /*
+ * Revert to the original ret regardless we could finish
+ * one block group or not.
+ */
+ if (ret >= 0)
+ ret = 1;
+ }
+
if (ret > 0 || ret == -ENOSPC)
ret = 0;
break;
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 2ffc6d50d20d..0c2d81b0e3d3 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -2222,3 +2222,56 @@ int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)
return ret < 0 ? ret : 1;
}
+
+int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
+ struct btrfs_space_info *space_info,
+ bool do_finish)
+{
+ struct btrfs_block_group *bg;
+ int index;
+
+ if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA))
+ return 0;
+
+ /* No more block groups to activate */
+ if (space_info->active_total_bytes == space_info->total_bytes)
+ return 0;
+
+ for (;;) {
+ int ret;
+ bool need_finish = false;
+
+ down_read(&space_info->groups_sem);
+ for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) {
+ list_for_each_entry(bg, &space_info->block_groups[index],
+ list) {
+ if (!spin_trylock(&bg->lock))
+ continue;
+ if (btrfs_zoned_bg_is_full(bg) || bg->zone_is_active) {
+ spin_unlock(&bg->lock);
+ continue;
+ }
+ spin_unlock(&bg->lock);
+
+ if (btrfs_zone_activate(bg)) {
+ up_read(&space_info->groups_sem);
+ return 1;
+ }
+
+ need_finish = true;
+ }
+ }
+ up_read(&space_info->groups_sem);
+
+ if (!do_finish || !need_finish)
+ break;
+
+ ret = btrfs_zone_finish_one_bg(fs_info);
+ if (ret == 0)
+ break;
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h
index 0740458894ac..1cac32266276 100644
--- a/fs/btrfs/zoned.h
+++ b/fs/btrfs/zoned.h
@@ -80,6 +80,8 @@ void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info);
void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,
u64 length);
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);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
@@ -250,6 +252,14 @@ static inline int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)
return 1;
}
+static inline int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
+ struct btrfs_space_info *space_info,
+ bool do_finish)
+{
+ /* Consider all the block groups are active */
+ return 0;
+}
+
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
--
2.35.1
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