@@ -6966,6 +6966,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
int err = 0;
int ret;
int level;
+ bool root_dropped = false;
path = btrfs_alloc_path();
if (!path) {
@@ -7136,12 +7137,22 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
free_extent_buffer(root->commit_root);
kfree(root);
}
+ root_dropped = true;
out_end_trans:
btrfs_end_transaction_throttle(trans, tree_root);
out_free:
kfree(wc);
btrfs_free_path(path);
out:
+ /*
+ * So if we need to stop dropping the snapshot for whatever reason we
+ * need to make sure to add it back to the dead root list so that we
+ * keep trying to do the work later. This also cleans up roots if we
+ * don't have it in the radix (like when we recover after a power fail
+ * or unmount) so we don't leak memory.
+ */
+ if (root_dropped == false)
+ btrfs_add_dead_root(root);
if (err)
btrfs_std_error(root->fs_info, err);
return err;
This is a note to let you know that I have just added a patch titled Btrfs: re-add root to dead root list if we stop dropping it to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue This patch is scheduled to be released in version 3.8.13.6. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From f9eedbf217682de2b2ee90ae71410cbc94fe4a78 Mon Sep 17 00:00:00 2001 From: Josef Bacik <jbacik@fusionio.com> Date: Wed, 17 Jul 2013 19:30:20 -0400 Subject: Btrfs: re-add root to dead root list if we stop dropping it commit d29a9f629e009c9b90e5859bce581070fd6247fc upstream. If we stop dropping a root for whatever reason we need to add it back to the dead root list so that we will re-start the dropping next transaction commit. The other case this happens is if we recover a drop because we will add a root without adding it to the fs radix tree, so we can leak it's root and commit root extent buffer, adding this to the dead root list makes this cleanup happen. Thanks, Reported-by: Alex Lyakas <alex.btrfs@zadarastorage.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- fs/btrfs/extent-tree.c | 11 +++++++++++ 1 file changed, 11 insertions(+) -- 1.8.1.2