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Message-Id: <20200102220559.262428738@linuxfoundation.org>
Date: Thu, 2 Jan 2020 23:06:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 088/171] btrfs: dont double lock the subvol_sem for rename exchange
From: Josef Bacik <josef@...icpanda.com>
[ Upstream commit 943eb3bf25f4a7b745dd799e031be276aa104d82 ]
If we're rename exchanging two subvols we'll try to lock this lock
twice, which is bad. Just lock once if either of the ino's are subvols.
Fixes: cdd1fedf8261 ("btrfs: add support for RENAME_EXCHANGE and RENAME_WHITEOUT")
CC: stable@...r.kernel.org # 4.4+
Signed-off-by: Josef Bacik <josef@...icpanda.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/btrfs/inode.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 80937c5ca477..bb8863958ac0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9597,9 +9597,8 @@ static int btrfs_rename_exchange(struct inode *old_dir,
return -EXDEV;
/* close the race window with snapshot create/destroy ioctl */
- if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
- down_read(&root->fs_info->subvol_sem);
- if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
+ if (old_ino == BTRFS_FIRST_FREE_OBJECTID ||
+ new_ino == BTRFS_FIRST_FREE_OBJECTID)
down_read(&dest->fs_info->subvol_sem);
/*
@@ -9785,9 +9784,8 @@ static int btrfs_rename_exchange(struct inode *old_dir,
ret2 = btrfs_end_transaction(trans, root);
ret = ret ? ret : ret2;
out_notrans:
- if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
- up_read(&dest->fs_info->subvol_sem);
- if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
+ if (new_ino == BTRFS_FIRST_FREE_OBJECTID ||
+ old_ino == BTRFS_FIRST_FREE_OBJECTID)
up_read(&root->fs_info->subvol_sem);
return ret;
--
2.20.1
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