linux-kernel - [PATCH 5.14 013/432] btrfs: zoned: fix block group alloc

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Message-Id: <20210916155811.259322586@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:56:02 +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>
Subject: [PATCH 5.14 013/432] btrfs: zoned: fix block group alloc_offset calculation

From: Naohiro Aota <naohiro.aota@....com>

commit 0ae79c6fe70d5c5c645733b7ed39d5e6021d8c9a upstream.

alloc_offset is offset from the start of a block group and @offset is
actually an address in logical space. Thus, we need to consider
block_group->start when calculating them.

Fixes: 011b41bffa3d ("btrfs: zoned: advance allocation pointer after tree log node")
CC: stable@...r.kernel.org # 5.12+
Signed-off-by: Naohiro Aota <naohiro.aota@....com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/free-space-cache.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2652,8 +2652,11 @@ int btrfs_remove_free_space(struct btrfs
 		 * btrfs_pin_extent_for_log_replay() when replaying the log.
 		 * Advance the pointer not to overwrite the tree-log nodes.
 		 */
-		if (block_group->alloc_offset < offset + bytes)
-			block_group->alloc_offset = offset + bytes;
+		if (block_group->start + block_group->alloc_offset <
+		    offset + bytes) {
+			block_group->alloc_offset =
+				offset + bytes - block_group->start;
+		}
 		return 0;
 	}