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btrfs: hold a ref on the root in create_reloc_inode 

We're creating a reloc inode in the data reloc tree, we need to hold a
ref on the root while we're doing that.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:43 -05:00 committed by David Sterba
parent 3d7babdcf2
commit 76deacf023
1 changed files with 6 additions and 1 deletions
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7
fs/btrfs/relocation.c
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@ -4351,10 +4351,14 @@ struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID);
if (IS_ERR(root))
return ERR_CAST(root);
if (!btrfs_grab_fs_root(root))
return ERR_PTR(-ENOENT);
trans = btrfs_start_transaction(root, 6);
if (IS_ERR(trans))
if (IS_ERR(trans)) {
btrfs_put_fs_root(root);
return ERR_CAST(trans);
}
err = btrfs_find_free_objectid(root, &objectid);
if (err)
@ -4372,6 +4376,7 @@ struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
err = btrfs_orphan_add(trans, BTRFS_I(inode));
out:
btrfs_put_fs_root(root);
btrfs_end_transaction(trans);
btrfs_btree_balance_dirty(fs_info);
if (err) {