btrfs: zoned: fix missing chunk metadata reservation

reserve_chunk_space() stores the return value of
btrfs_zoned_activate_one_bg() in ret. The helper can return 1 after
successfully activating a block group, but ret is later used to decide
whether to reserve metadata for chunk tree updates.

As a result, successful activation skips btrfs_block_rsv_add() and leaves
trans->chunk_bytes_reserved unchanged. Use a separate variable for the
activation result so positive success does not affect the later
reservation. Keep activation failures in ret instead of returning early so
the function uses the common tail path.

Fixes: b6a98021e401 ("btrfs: zoned: activate necessary block group")
CC: stable@vger.kernel.org
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Guanghui Yang <3497809730@qq.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index ab76a5173272a1bd3341af0565415b94abd6a2c6..8def7abb728f7fe1c41e699376b7a6215735ff43 100644 (file)
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -4532,25 +4532,29 @@ static void reserve_chunk_space(struct btrfs_trans_handle *trans,
                if (IS_ERR(bg)) {
                        ret = PTR_ERR(bg);
                } else {
+                       int activate_ret;
+
                        /*
                         * We have a new chunk. We also need to activate it for
                         * zoned filesystem.
                         */
-                       ret = btrfs_zoned_activate_one_bg(info, true);
-                       if (ret < 0)
-                               return;
-
-                       /*
-                        * If we fail to add the chunk item here, we end up
-                        * trying again at phase 2 of chunk allocation, at
-                        * btrfs_create_pending_block_groups(). So ignore
-                        * any error here. An ENOSPC here could happen, due to
-                        * the cases described at do_chunk_alloc() - the system
-                        * block group we just created was just turned into RO
-                        * mode by a scrub for example, or a running discard
-                        * temporarily removed its free space entries, etc.
-                        */
-                       btrfs_chunk_alloc_add_chunk_item(trans, bg);
+                       activate_ret = btrfs_zoned_activate_one_bg(info, true);
+                       if (activate_ret < 0) {
+                               ret = activate_ret;
+                       } else {
+                               /*
+                                * If we fail to add the chunk item here, we end
+                                * up trying again at phase 2 of chunk allocation,
+                                * at btrfs_create_pending_block_groups(). So
+                                * ignore any error here. An ENOSPC here could
+                                * happen, due to the cases described at
+                                * do_chunk_alloc() - the system block group we
+                                * just created was just turned into RO mode by a
+                                * scrub for example, or a running discard
+                                * temporarily removed its free space entries, etc.
+                                */
+                               btrfs_chunk_alloc_add_chunk_item(trans, bg);
+                       }
                }
        }