From: Naohiro Aota <naohiro.aota@wdc.com>
Date: Mon, 13 Mar 2023 16:29:49 +0900
Subject: [PATCH] btrfs: zoned: fix btrfs_can_activate_zone() to support DUP
 profile
References: bsc#1012628
Patch-mainline: 6.2.9
Git-commit: 9e1cdf0c354e46e428c0e0cab008abbe81b6013d

commit 9e1cdf0c354e46e428c0e0cab008abbe81b6013d upstream.

btrfs_can_activate_zone() returns true if at least one device has one zone
available for activation. This is OK for the single profile, but not OK for
DUP profile. We need two zones to create a DUP block group. Fix it by
properly handling the case with the profile flags.

Fixes: 265f7237dd25 ("btrfs: zoned: allow DUP on meta-data block groups")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/btrfs/zoned.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1f503e8e..f3b7d8ae 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -2100,11 +2100,21 @@ bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
 		if (!device->bdev)
 			continue;
 
-		if (!zinfo->max_active_zones ||
-		    atomic_read(&zinfo->active_zones_left)) {
+		if (!zinfo->max_active_zones) {
 			ret = true;
 			break;
 		}
+
+		switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+		case 0: /* single */
+			ret = (atomic_read(&zinfo->active_zones_left) >= 1);
+			break;
+		case BTRFS_BLOCK_GROUP_DUP:
+			ret = (atomic_read(&zinfo->active_zones_left) >= 2);
+			break;
+		}
+		if (ret)
+			break;
 	}
 	mutex_unlock(&fs_info->chunk_mutex);
 
-- 
2.35.3