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    Subject[PATCH 5.6 065/254] btrfs: track reloc roots based on their commit root bytenr
    Date
    From: Josef Bacik <josef@toxicpanda.com>

    [ Upstream commit ea287ab157c2816bf12aad4cece41372f9d146b4 ]

    We always search the commit root of the extent tree for looking up back
    references, however we track the reloc roots based on their current
    bytenr.

    This is wrong, if we commit the transaction between relocating tree
    blocks we could end up in this code in build_backref_tree

    if (key.objectid == key.offset) {
    /*
    * Only root blocks of reloc trees use backref
    * pointing to itself.
    */
    root = find_reloc_root(rc, cur->bytenr);
    ASSERT(root);
    cur->root = root;
    break;
    }

    find_reloc_root() is looking based on the bytenr we had in the commit
    root, but if we've COWed this reloc root we will not find that bytenr,
    and we will trip over the ASSERT(root).

    Fix this by using the commit_root->start bytenr for indexing the commit
    root. Then we change the __update_reloc_root() caller to be used when
    we switch the commit root for the reloc root during commit.

    This fixes the panic I was seeing when we started throttling relocation
    for delayed refs.

    Signed-off-by: Josef Bacik <josef@toxicpanda.com>
    Signed-off-by: David Sterba <dsterba@suse.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/btrfs/relocation.c | 17 +++++++----------
    1 file changed, 7 insertions(+), 10 deletions(-)

    diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
    index d7e8839048d71..8e86934a17c35 100644
    --- a/fs/btrfs/relocation.c
    +++ b/fs/btrfs/relocation.c
    @@ -1298,7 +1298,7 @@ static int __must_check __add_reloc_root(struct btrfs_root *root)
    if (!node)
    return -ENOMEM;

    - node->bytenr = root->node->start;
    + node->bytenr = root->commit_root->start;
    node->data = root;

    spin_lock(&rc->reloc_root_tree.lock);
    @@ -1329,10 +1329,11 @@ static void __del_reloc_root(struct btrfs_root *root)
    if (rc && root->node) {
    spin_lock(&rc->reloc_root_tree.lock);
    rb_node = tree_search(&rc->reloc_root_tree.rb_root,
    - root->node->start);
    + root->commit_root->start);
    if (rb_node) {
    node = rb_entry(rb_node, struct mapping_node, rb_node);
    rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
    + RB_CLEAR_NODE(&node->rb_node);
    }
    spin_unlock(&rc->reloc_root_tree.lock);
    if (!node)
    @@ -1350,7 +1351,7 @@ static void __del_reloc_root(struct btrfs_root *root)
    * helper to update the 'address of tree root -> reloc tree'
    * mapping
    */
    -static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr)
    +static int __update_reloc_root(struct btrfs_root *root)
    {
    struct btrfs_fs_info *fs_info = root->fs_info;
    struct rb_node *rb_node;
    @@ -1359,7 +1360,7 @@ static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr)

    spin_lock(&rc->reloc_root_tree.lock);
    rb_node = tree_search(&rc->reloc_root_tree.rb_root,
    - root->node->start);
    + root->commit_root->start);
    if (rb_node) {
    node = rb_entry(rb_node, struct mapping_node, rb_node);
    rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
    @@ -1371,7 +1372,7 @@ static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr)
    BUG_ON((struct btrfs_root *)node->data != root);

    spin_lock(&rc->reloc_root_tree.lock);
    - node->bytenr = new_bytenr;
    + node->bytenr = root->node->start;
    rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
    node->bytenr, &node->rb_node);
    spin_unlock(&rc->reloc_root_tree.lock);
    @@ -1529,6 +1530,7 @@ int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
    }

    if (reloc_root->commit_root != reloc_root->node) {
    + __update_reloc_root(reloc_root);
    btrfs_set_root_node(root_item, reloc_root->node);
    free_extent_buffer(reloc_root->commit_root);
    reloc_root->commit_root = btrfs_root_node(reloc_root);
    @@ -4727,11 +4729,6 @@ int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
    BUG_ON(rc->stage == UPDATE_DATA_PTRS &&
    root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID);

    - if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
    - if (buf == root->node)
    - __update_reloc_root(root, cow->start);
    - }
    -
    level = btrfs_header_level(buf);
    if (btrfs_header_generation(buf) <=
    btrfs_root_last_snapshot(&root->root_item))
    --
    2.20.1


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