Commit 46c4e71e authored Jun 24, 2014 by Filipe Manana Committed by Chris Mason Jun 28, 2014

Btrfs: assert send doesn't attempt to start transactions



When starting a transaction just assert that current->journal_info
doesn't contain a send transaction stub, since send isn't supposed
to start transactions and when it finishes (either successfully or
not) it's supposed to set current->journal_info to NULL.

This is motivated by the change titled:

    Btrfs: fix crash when starting transaction

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>

parent c39aa705

fs/btrfs/transaction.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -386,11 +386,13 @@ start_transaction(struct btrfs_root *root, u64 num_items, unsigned int type,
		bool reloc_reserved = false;
		int ret;

		/* Send isn't supposed to start transactions. */
		ASSERT(current->journal_info != (void *)BTRFS_SEND_TRANS_STUB);

		if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
		return ERR_PTR(-EROFS);

		if (current->journal_info &&
		current->journal_info != (void *)BTRFS_SEND_TRANS_STUB) {
		if (current->journal_info) {
		WARN_ON(type & TRANS_EXTWRITERS);
		h = current->journal_info;
		h->use_count++;