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Message-Id: <20200410035005.9371-29-sashal@kernel.org>
Date: Thu, 9 Apr 2020 23:50:02 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>,
Sasha Levin <sashal@...nel.org>, linux-btrfs@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 29/32] btrfs: hold a ref on the root in btrfs_recover_relocation
From: Josef Bacik <josef@...icpanda.com>
[ Upstream commit 932fd26df8125a5b14438563c4d3e33f59ba80f7 ]
We look up the fs root in various places in here when recovering from a
crashed relcoation. Make sure we hold a ref on the root whenever we
look them up.
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/relocation.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index f98913061a40c..377cf3785fbbd 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4428,6 +4428,12 @@ int btrfs_recover_relocation(struct btrfs_root *root)
err = ret;
goto out;
}
+ } else {
+ if (!btrfs_grab_fs_root(fs_root)) {
+ err = -ENOENT;
+ goto out;
+ }
+ btrfs_put_fs_root(fs_root);
}
}
@@ -4477,10 +4483,15 @@ int btrfs_recover_relocation(struct btrfs_root *root)
list_add_tail(&reloc_root->root_list, &reloc_roots);
goto out_free;
}
+ if (!btrfs_grab_fs_root(fs_root)) {
+ err = -ENOENT;
+ goto out_free;
+ }
err = __add_reloc_root(reloc_root);
BUG_ON(err < 0); /* -ENOMEM or logic error */
fs_root->reloc_root = reloc_root;
+ btrfs_put_fs_root(fs_root);
}
err = btrfs_commit_transaction(trans);
@@ -4508,10 +4519,14 @@ int btrfs_recover_relocation(struct btrfs_root *root)
if (err == 0) {
/* cleanup orphan inode in data relocation tree */
fs_root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID);
- if (IS_ERR(fs_root))
+ if (IS_ERR(fs_root)) {
err = PTR_ERR(fs_root);
- else
- err = btrfs_orphan_cleanup(fs_root);
+ } else {
+ if (btrfs_grab_fs_root(fs_root)) {
+ err = btrfs_orphan_cleanup(fs_root);
+ btrfs_put_fs_root(fs_root);
+ }
+ }
}
return err;
}
--
2.20.1
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