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btrfs: hold a ref on the root in create_pending_snapshot 

We create the snapshot and then use it for a bunch of things, we need to
hold a ref on it while we're messing with it.

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 09:32:50 -05:00 committed by David Sterba
parent 5168489a07
commit 5119cfc36f
2 changed files with 7 additions and 0 deletions
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1
fs/btrfs/ioctl.c
View File

@ -875,6 +875,7 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
d_instantiate(dentry, inode);
ret = 0;
fail:
btrfs_put_fs_root(pending_snapshot->snap);
btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
dec_and_free:
if (snapshot_force_cow)

6
fs/btrfs/transaction.c
View File

@ -1639,6 +1639,12 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
btrfs_abort_transaction(trans, ret);
goto fail;
}
if (!btrfs_grab_fs_root(pending->snap)) {
ret = -ENOENT;
pending->snap = NULL;
btrfs_abort_transaction(trans, ret);
goto fail;
}
ret = btrfs_reloc_post_snapshot(trans, pending);
if (ret) {