From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Filipe Manana <fdmanana@suse.com>,
Nikolay Borisov <nborisov@suse.com>,
David Sterba <dsterba@suse.com>, Sasha Levin <sashal@kernel.org>,
linux-btrfs@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 293/371] Btrfs: fix inode cache waiters hanging on path allocation failure
Date: Thu, 16 Jan 2020 12:22:45 -0500 [thread overview]
Message-ID: <20200116172403.18149-236-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>
From: Filipe Manana <fdmanana@suse.com>
[ Upstream commit 9d123a35d7e97bb2139747b16127c9b22b6a593e ]
If the caching thread fails to allocate a path, it returns without waking
up any cache waiters, leaving them hang forever. Fix this by following the
same approach as when we fail to start the caching thread: print an error
message, disable inode caching and make the wakers fallback to non-caching
mode behaviour (calling btrfs_find_free_objectid()).
Fixes: 581bb050941b4f ("Btrfs: Cache free inode numbers in memory")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/btrfs/inode-map.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index b1c3a4ec76c8..2ae32451fb5b 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -55,8 +55,10 @@ static int caching_kthread(void *data)
return 0;
path = btrfs_alloc_path();
- if (!path)
+ if (!path) {
+ fail_caching_thread(root);
return -ENOMEM;
+ }
/* Since the commit root is read-only, we can safely skip locking. */
path->skip_locking = 1;
--
2.20.1
next prev parent reply other threads:[~2020-01-16 18:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:22 ` [PATCH AUTOSEL 4.14 291/371] Btrfs: fix hang when loading existing inode cache off disk Sasha Levin
2020-01-16 17:22 ` [PATCH AUTOSEL 4.14 292/371] Btrfs: fix inode cache waiters hanging on failure to start caching thread Sasha Levin
2020-01-16 17:22 ` Sasha Levin [this message]
2020-01-16 17:22 ` [PATCH AUTOSEL 4.14 294/371] btrfs: use correct count in btrfs_file_write_iter() Sasha Levin
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