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| author | Josef Bacik <jbacik@fb.com> | 2018-11-30 11:52:13 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-12-17 14:51:48 +0100 |
| commit | 83354f0772cd07828b0fcdf1ef2872fd2032acb8 (patch) | |
| tree | d552f12d1a5870ce7be0c6fceff361f558b96265 /fs/btrfs/ctree.c | |
| parent | 01e0da48856fe964e2a981e5541cee234b8a43a3 (diff) | |
| download | linux-83354f0772cd07828b0fcdf1ef2872fd2032acb8.tar.gz linux-83354f0772cd07828b0fcdf1ef2872fd2032acb8.tar.bz2 linux-83354f0772cd07828b0fcdf1ef2872fd2032acb8.zip | |
btrfs: catch cow on deleting snapshots
When debugging some weird extent reference bug I suspected that we were
changing a snapshot while we were deleting it, which could explain my
bug. This was indeed what was happening, and this patch helped me
verify my theory. It is never correct to modify the snapshot once it's
being deleted, so mark the root when we are deleting it and make sure we
complain about it when it happens.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 5912a97b07a6..72745235896f 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1440,6 +1440,10 @@ noinline int btrfs_cow_block(struct btrfs_trans_handle *trans, u64 search_start; int ret; + if (test_bit(BTRFS_ROOT_DELETING, &root->state)) + btrfs_err(fs_info, + "COW'ing blocks on a fs root that's being dropped"); + if (trans->transaction != fs_info->running_transaction) WARN(1, KERN_CRIT "trans %llu running %llu\n", trans->transid, |