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Message-Id: <20230720134123.13148-1-lhenriques@suse.de>
Date: Thu, 20 Jul 2023 14:41:23 +0100
From: Luís Henriques <lhenriques@...e.de>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>,
Johannes Thumshirn <Johannes.Thumshirn@....com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
Luís Henriques <lhenriques@...e.de>
Subject: [PATCH v2] btrfs: propagate error from function unpin_extent_cache()
Function unpin_extent_cache() doesn't propagate an error if the call to
lookup_extent_mapping() fails. This patch adds an error return (EINVAL)
and simply logs it in the only caller.
Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
Hi!
As per David and Johannes reviews, I'm now proposing a different approach.
Note that I kept the WARN_ON() instead of replacing it by an ASSERT(). In
fact, I considered removing the WARN_ON() completely and simply return the
error if em->start != start. But I guess it may useful for debug.
Changes since v1:
Instead of changing unpin_extent_cache() into a void function, make it
propage an error code instead.
fs/btrfs/extent_map.c | 4 +++-
fs/btrfs/inode.c | 8 ++++++--
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 0cdb3e86f29b..f4e7956edc05 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -304,8 +304,10 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
WARN_ON(!em || em->start != start);
- if (!em)
+ if (!em) {
+ ret = -EINVAL;
goto out;
+ }
em->generation = gen;
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index dbbb67293e34..21eb66fcc0df 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3273,8 +3273,12 @@ int btrfs_finish_one_ordered(struct btrfs_ordered_extent *ordered_extent)
ordered_extent->disk_num_bytes);
}
}
- unpin_extent_cache(&inode->extent_tree, ordered_extent->file_offset,
- ordered_extent->num_bytes, trans->transid);
+
+ /* Proceed even if we fail to unpin extent from cache */
+ if (unpin_extent_cache(&inode->extent_tree, ordered_extent->file_offset,
+ ordered_extent->num_bytes, trans->transid) < 0)
+ btrfs_warn(fs_info, "failed to unpin extent from cache");
+
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out;
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