From 534cf531ccf6331b6e63a054f2ceb8e1ccff1ec9 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@suse.com>
Date: Fri, 17 Apr 2020 16:36:50 +0100
Subject: [PATCH] btrfs: simplify error handling of clean_pinned_extents()
At clean_pinned_extents(), whether we end up returning success or failure,
we pretty much have to do the same things:
1) unlock unused_bg_unpin_mutex
2) decrement reference count on the previous transaction
We also call btrfs_dec_block_group_ro() in case of failure, but that is
better done in its caller, btrfs_delete_unused_bgs(), since its the
caller that calls inc_block_group_ro(), so it should be responsible for
the decrement operation, as it is in case any of the other functions it
calls fail.
So move the call to btrfs_dec_block_group_ro() from clean_pinned_extents()
into btrfs_delete_unused_bgs() and unify the error and success return
paths for clean_pinned_extents(), reducing duplicated code and making it
simpler.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/block-group.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 233c5663f2332..5627f53ca1151 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1284,25 +1284,17 @@ static bool clean_pinned_extents(struct btrfs_trans_handle *trans,
ret = clear_extent_bits(&prev_trans->pinned_extents, start, end,
EXTENT_DIRTY);
if (ret)
- goto err;
+ goto out;
}
ret = clear_extent_bits(&trans->transaction->pinned_extents, start, end,
EXTENT_DIRTY);
- if (ret)
- goto err;
+out:
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
if (prev_trans)
btrfs_put_transaction(prev_trans);
- return true;
-
-err:
- mutex_unlock(&fs_info->unused_bg_unpin_mutex);
- if (prev_trans)
- btrfs_put_transaction(prev_trans);
- btrfs_dec_block_group_ro(bg);
- return false;
+ return ret == 0;
}
/*
@@ -1400,8 +1392,10 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
* We could have pending pinned extents for this block group,
* just delete them, we don't care about them anymore.
*/
- if (!clean_pinned_extents(trans, block_group))
+ if (!clean_pinned_extents(trans, block_group)) {
+ btrfs_dec_block_group_ro(block_group);
goto end_trans;
+ }
/*
* At this point, the block_group is read only and should fail
--
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