[thin_repair] work in progress
This commit is contained in:
Joe Thornber
parent
8abac422b2
commit
aace49cdd6
@ -18,19 +18,22 @@
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;;; node though, can't be used to differentiate).
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(define (thin-check metadata root)
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(let ((exit-code (system
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(fmt #f "../bin/thin_check --skip-mappings --override-mapping-root "
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(fmt #f "../bin/thin_check --override-mapping-root "
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root " " metadata " > /dev/null 2>&1"))))
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(fmt #t "exit-code: " (wrt exit-code) ", ")
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(zero? exit-code)))
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(define metadata "../customer-metadata-full.bin")
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;(define metadata "../metadataoriginal")
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;(define nr-metadata-blocks 262144)
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(define metadata "/home/ejt/work/RedHat/rhel7-vm/dmtest/metadata.bin")
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(define nr-metadata-blocks 32768)
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;; FIXME: aren't we returning a reference to a cache page and then dropping the lock?
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(define (read-superblock cache)
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(with-block (b cache 0 (get-flags))
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(block->superblock b)))
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(define nr-metadata-blocks 8192)
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(define (in-metadata-bounds? i)
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(< i nr-metadata-blocks))
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@ -87,6 +90,11 @@
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(< (ftype-ref BTreeNodeHeader (nr-entries) hdr)
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(/ (ftype-ref BTreeNodeHeader (max-entries) hdr) 3))))
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(define (details-leaf? b hdr)
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(and (leaf-node? hdr)
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(= (ftype-sizeof ThinDeviceDetails)
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(ftype-ref BTreeNodeHeader (value-size) hdr))))
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(define (classify-node b hdr)
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(fold-left append '()
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(map (lambda (pair)
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@ -95,7 +103,8 @@
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'()))
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`((,internal? internal)
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(,bottom-level-leaf? bottom-level-leaf)
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(,top-level-leaf? top-level-leaf)))))
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(,top-level-leaf? top-level-leaf)
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(,details-leaf? details-leaf)))))
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(define (checksum-btree-node b)
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(checksum-block b (ftype-sizeof unsigned-32) btree-node-salt))
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@ -120,6 +129,7 @@
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(define (dump-device-details cache)
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(let ((sb (read-superblock cache)))
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(fmt #t sb)
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(device-tree-each cache (ftype-ref ThinSuperblock (device-details-root) sb)
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(lambda (dev-id dd)
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(fmt #t "dev-id: " dev-id "\n"
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@ -139,14 +149,16 @@
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;; An interesting node has more than one class.
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(define (filter-interesting-blocks classes)
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(filter (lambda (xs)
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(> (length xs) 1))
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(>= (length xs) 1))
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classes))
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(define (fmt-list xs)
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(for-each (lambda (x) (fmt #t x nl)) xs))
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(with-bcache (cache metadata (* 16 1024))
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(dump-device-details cache)
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(let ((classes (classify-nodes cache))
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(rmap (make-eq-hashtable)))
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(fmt #t (filter-interesting-blocks classes))))
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(fmt-list (filter-interesting-blocks classes))))
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#|
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(with-bcache (cache metadata (* 16 1024))
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@ -159,7 +171,7 @@
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#|
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(let loop ((i 0)
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(successes '()))
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(if (> i 8192)
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(if (> i nr-metadata-blocks)
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(fmt #t "successes: " (wrt successes) "\n")
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;; add --ignore-non-fatal-errors flag
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(if (thin-check "../customer-metadata-full.bin" i)
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@ -169,4 +181,4 @@
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(begin
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(fmt #t "fail: " i "\n")
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(loop (+ i 1) successes)))))
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|#
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|#
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@ -1,6 +1,9 @@
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#ifndef PERSISTENT_DATA_DATA_STRUCTURES_SIMPLE_TRAITS_H
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#define PERSISTENT_DATA_DATA_STRUCTURES_SIMPLE_TRAITS_H
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#include "base/endian_utils.h"
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#include "persistent-data/data-structures/btree.h"
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//----------------------------------------------------------------
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namespace persistent_data {
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@ -20,11 +20,358 @@
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#include "thin-provisioning/metadata_dumper.h"
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#include "thin-provisioning/mapping_tree.h"
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#include <map>
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#include <vector>
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using namespace persistent_data;
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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// We only need to examine the mapping tree, and device details tree.
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// The space maps can be inferred.
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// Repair process:
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// - We only trigger the repair process if there's damage when walking from
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// the roots given in the superblock.
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// - If there is damage, then we try and find the most recent roots with the
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// least corruption. We're seeing cases where just the superblock has been
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// trashed so finding the best roots is essential, and sadly non trivial.
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// Finding roots:
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// This is about classifying and summarising btree nodes. The use of a btree
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// node may not be obvious when inspecting it in isolation. But more information
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// may be gleaned by examining child and sibling nodes.
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//
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// So the process is:
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// - scan every metadata block, summarising it's potential uses.
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// - repeatedly iterate those summaries until we can glean no more useful information.
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// - sort candidate roots, choose best
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// Summary information:
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// - btree; mapping top level, mapping bottom level, device tree (more than one possible)
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// - node type; internal or leaf
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// - age; for mapping trees we can infer a minimum age from the block/time
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// values. In addition two similar leaf nodes can be compared by looking
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// at the block/time for _specific_ blocks. This means we can define an ordering
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// on the ages, but not equality.
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// - Device details can be aged based on the last_snapshot_time field.
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// Iteration of summary info:
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// - constraints propagate both up and down the trees. eg, node 'a' may
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// be ambiguous (all internal nodes are ambigous). If we find that all it's
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// children are device details trees, then we infer that this is too and lose
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// the ambiguity. Now if it has a sibling we can infer on this too.
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// - Some characteristics only propagate upwards. eg, age. So we need two monoids
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// for summary info (up and down).
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namespace {
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using namespace std;
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using namespace boost;
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using namespace persistent_data::btree_detail;
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using namespace thin_provisioning::device_tree_detail;
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enum btree_type_bit {
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TOP_LEVEL,
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BOTTOM_LEVEL,
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DEVICE_DETAILS
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};
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struct node_info {
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node_info()
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: types(0),
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b(0),
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values(0),
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orphan(true),
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is_leaf(true),
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key_low(0),
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key_high(0),
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age(0) {
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}
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void add_type(btree_type_bit b) {
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types = types | (1 << b);
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}
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void clear_type(btree_type_bit b) {
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types = types & ~(1 << b);
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}
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bool has_type(btree_type_bit b) const {
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return types & (1 << b);
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}
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// Indicate corruption by having no fields set
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unsigned types;
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// common
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block_address b;
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unsigned values;
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bool orphan;
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bool is_leaf;
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uint64_t key_low;
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uint64_t key_high;
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set<uint32_t> devices;
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uint32_t age;
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};
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using info_map = map<block_address, node_info>;
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bool is_btree_node(block_manager<> &bm, block_address b) {
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auto v = create_btree_node_validator();
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auto rr = bm.read_lock(b);
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return v->check_raw(rr.data());
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}
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uint32_t get_dd_age(device_details const &dd) {
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return max(dd.creation_time_, dd.snapshotted_time_);
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}
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void scan_initial_infos(block_manager<> &bm, info_map &result) {
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for (block_address b = 0; b < bm.get_nr_blocks(); b++) {
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if (!is_btree_node(bm, b))
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continue;
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node_info info;
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info.b = b;
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auto rr = bm.read_lock(b);
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auto hdr = reinterpret_cast<node_header const *>(rr.data());
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auto flags = to_cpu<uint32_t>(hdr->flags);
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if (flags & INTERNAL_NODE) {
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info.is_leaf = false;
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info.add_type(TOP_LEVEL);
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info.add_type(BOTTOM_LEVEL);
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info.add_type(DEVICE_DETAILS);
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} else {
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info.is_leaf = true;
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auto vsize = to_cpu<uint32_t>(hdr->value_size);
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info.values = to_cpu<uint32_t>(hdr->nr_entries);
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if (vsize == sizeof(device_details_traits::disk_type)) {
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info.add_type(DEVICE_DETAILS);
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auto n = to_node<device_details_traits>(rr);
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if (n.get_nr_entries()) {
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info.key_low = n.key_at(0);
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info.key_high = n.key_at(n.get_nr_entries() - 1);
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}
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for (unsigned i = 0; i < n.get_nr_entries(); i++)
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info.age = max(info.age, get_dd_age(n.value_at(i)));
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} else if (vsize == sizeof(uint64_t)) {
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info.add_type(BOTTOM_LEVEL);
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// This can only be a top level leaf if all the values are
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// blocks on the metadata device.
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auto is_top_level = true;
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auto n = to_node<block_traits>(rr);
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if (n.get_nr_entries()) {
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info.key_low = n.key_at(0);
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info.key_high = n.key_at(n.get_nr_entries() - 1);
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}
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for (unsigned i = 0; i < n.get_nr_entries(); i++) {
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if (n.value_at(i) >= bm.get_nr_blocks()) {
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is_top_level = false;
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break;
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}
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}
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if (is_top_level)
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info.add_type(TOP_LEVEL);
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} else
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continue;
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}
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result.insert(make_pair(b, info));
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}
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}
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bool merge_types(node_info &parent, node_info const &child, btree_type_bit b) {
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if (parent.has_type(b) && !child.has_type(b)) {
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parent.clear_type(b);
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return true;
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}
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return false;
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}
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// return true if something changed
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bool merge_from_below(node_info &parent, node_info const &child) {
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bool changed = false;
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changed = merge_types(parent, child, TOP_LEVEL) ||
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merge_types(parent, child, BOTTOM_LEVEL) ||
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merge_types(parent, child, DEVICE_DETAILS);
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return changed;
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}
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void fail(node_info &n) {
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n.types = 0;
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}
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bool failed(node_info const &n) {
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return n.types == 0;
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}
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bool iterate_infos_(block_manager<> &bm, info_map &infos) {
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bool changed = false;
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for (auto &p : infos) {
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auto &parent = p.second;
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if (parent.is_leaf)
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continue;
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// values refer to blocks, so we should have infos for them.
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auto rr = bm.read_lock(p.first);
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auto n = to_node<block_traits>(rr);
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uint64_t key_low = 0;
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unsigned values = 0;
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for (unsigned i = 0; i < n.get_nr_entries(); i++) {
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auto it = infos.find(n.value_at(i));
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if (it == infos.end()) {
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fail(parent);
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break;
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}
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auto &child = it->second;
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// we use the keys to help decide if this is a valid child
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if (child.key_low <= key_low) {
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fail(parent);
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break;
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} else
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key_low = child.key_high;
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changed = merge_from_below(parent, child) || changed;
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if (parent.has_type(DEVICE_DETAILS) && child.age > parent.age) {
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changed = true;
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parent.age = child.age;
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}
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values += child.values;
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}
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// We don't clear the orphan flags until we know the parent is good
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if (!failed(parent)) {
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parent.values = values;
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for (unsigned i = 0; i < n.get_nr_entries(); i++) {
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auto it = infos.find(n.value_at(i));
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if (it == infos.end())
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throw runtime_error("no child info, but it was there a moment ago");
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auto &child = it->second;
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child.orphan = false;
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}
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}
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}
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return changed;
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}
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void iterate_infos(block_manager<> &bm, info_map &infos) {
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while (iterate_infos_(bm, infos))
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;
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}
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bool trees_are_compatible(node_info const &mapping, node_info const &devices) {
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for (auto thin_id : mapping.devices)
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if (devices.devices.find(thin_id) == devices.devices.end())
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return false;
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return true;
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}
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bool cmp_mapping_info(node_info const &lhs, node_info const &rhs) {
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return lhs.age > rhs.age;
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}
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bool has_type(node_info const &i, unsigned bit) {
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return i.types & (1 << bit);
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}
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vector<node_info>
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extract_mapping_candidates(info_map const &infos) {
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vector<node_info> results;
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for (auto const &p : infos)
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if (p.second.orphan && has_type(p.second, TOP_LEVEL))
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results.push_back(p.second);
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//sort(results.begin(), results.end(), cmp_mapping_info);
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return results;
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}
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bool cmp_device_info(node_info const &lhs, node_info const &rhs) {
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// FIXME: finish
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return false;
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//return lhs.dd_age > rhs.dd_age;
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}
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vector<node_info>
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extract_device_candidates(info_map const &infos) {
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vector<node_info> results;
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for (auto const &p : infos)
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if (p.second.orphan && has_type(p.second, DEVICE_DETAILS))
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results.push_back(p.second);
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sort(results.begin(), results.end(), cmp_device_info);
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return results;
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}
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// Returns <mapping root>, <dev details root>
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//pair<block_address, block_address>
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void
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find_best_roots(block_manager<> &bm) {
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info_map infos;
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scan_initial_infos(bm, infos);
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iterate_infos(bm, infos);
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// These will be sorted into best first order
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vector<node_info> mapping_candidates = extract_mapping_candidates(infos);
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vector<node_info> device_candidates = extract_device_candidates(infos);
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cerr << "mapping candidates (" << mapping_candidates.size() << "):\n";
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for (auto const &i : mapping_candidates)
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cerr << i.b << ", tree size = " << i.values << ", age = " << i.age << "\n";
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cerr << "\ndevice candidates (" << device_candidates.size() << "):\n";
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for (auto const &i : device_candidates)
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cerr << i.b << ", tree size = " << i.values << ", age = " << i.age << "\n";
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#if 0
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// Choose the best mapping tree, and then the best device tree
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// that is compatible.
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for (auto &m : mapping_candidates)
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for (auto &d : device_candidates)
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if (trees_are_compatible(m, d))
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return make_pair(m.b, d.b);
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#endif
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// throw runtime_error("no compatible mapping/device trees");
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}
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}
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//----------------------------------------------------------------
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namespace {
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void raise_metadata_damage() {
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throw std::runtime_error("metadata contains errors (run thin_check for details).\n"
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@ -197,7 +544,7 @@ namespace {
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try {
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if (!opts_.skip_mappings_)
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emit_mappings(dev_id, tree_root);
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} catch (exception &e) {
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} catch (std::exception &e) {
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cerr << e.what();
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e_->end_device();
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throw;
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@ -246,6 +593,8 @@ namespace {
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void
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thin_provisioning::metadata_dump(metadata::ptr md, emitter::ptr e, dump_options const &opts)
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{
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find_best_roots(*md->tm_->get_bm());
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details_extractor de(opts);
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device_tree_detail::damage_visitor::ptr dd_policy(details_damage_policy(opts.repair_));
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walk_device_tree(*md->details_, de, *dd_policy);
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@ -52,7 +52,7 @@ namespace {
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metadata::ptr open_metadata(string const &path, struct flags &flags) {
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block_manager<>::ptr bm = open_bm(path, block_manager<>::READ_ONLY, !flags.use_metadata_snap);
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metadata::ptr md(flags.use_metadata_snap ? new metadata(bm, flags.snap_location) : new metadata(bm));
|
||||
metadata::ptr md(flags.use_metadata_snap ? new metadata(bm, flags.snap_location) : new metadata(bm, false));
|
||||
|
||||
return md;
|
||||
}
|
||||
|
||||
@ -30,6 +30,8 @@
|
||||
#include "thin-provisioning/commands.h"
|
||||
#include "version.h"
|
||||
|
||||
using namespace boost;
|
||||
using namespace std;
|
||||
using namespace thin_provisioning;
|
||||
|
||||
//----------------------------------------------------------------
|
||||
@ -463,11 +465,13 @@ namespace {
|
||||
|
||||
class metadata_scanner {
|
||||
public:
|
||||
metadata_scanner(block_manager<>::ptr bm, uint64_t scan_begin, uint64_t scan_end)
|
||||
metadata_scanner(block_manager<>::ptr bm, uint64_t scan_begin, uint64_t scan_end,
|
||||
bool check_for_strings)
|
||||
: bm_(bm),
|
||||
scan_begin_(scan_begin),
|
||||
scan_end_(scan_end),
|
||||
index_(scan_begin) {
|
||||
index_(scan_begin),
|
||||
check_for_strings_(check_for_strings) {
|
||||
if (scan_end_ <= scan_begin_)
|
||||
throw std::runtime_error("badly formed region (end <= begin)");
|
||||
|
||||
@ -486,8 +490,6 @@ namespace {
|
||||
run_range_ = r.clone();
|
||||
}
|
||||
|
||||
virtual ~metadata_scanner() {}
|
||||
|
||||
std::unique_ptr<block_range> get_range() {
|
||||
std::unique_ptr<block_range> ret;
|
||||
|
||||
@ -507,7 +509,44 @@ namespace {
|
||||
return ret;
|
||||
}
|
||||
|
||||
map<block_address, vector<string>> const &get_strings() const {
|
||||
return strings_;
|
||||
}
|
||||
|
||||
private:
|
||||
bool interesting_char(char c)
|
||||
{
|
||||
return isalnum(c) || ispunct(c);
|
||||
}
|
||||
|
||||
unsigned printable_len(const char *b, const char *e)
|
||||
{
|
||||
const char *p = b;
|
||||
|
||||
while (p != e && interesting_char(*p))
|
||||
p++;
|
||||
|
||||
return p - b;
|
||||
}
|
||||
|
||||
// asci text within our metadata is a sure sign of corruption.
|
||||
optional<vector<string> >
|
||||
scan_strings(block_manager<>::read_ref rr)
|
||||
{
|
||||
vector<string> r;
|
||||
const char *data = reinterpret_cast<const char *>(rr.data()), *end = data + MD_BLOCK_SIZE;
|
||||
|
||||
while (data < end) {
|
||||
auto len = printable_len(data, end);
|
||||
if (len >= 4)
|
||||
r.push_back(string(data, data + len));
|
||||
|
||||
data += len + 1;
|
||||
}
|
||||
|
||||
return r.size() ? optional<vector<string>>(r) : optional<vector<string>>();
|
||||
}
|
||||
|
||||
block_range const &read_block(block_address b) {
|
||||
block_manager<>::read_ref rr = bm_->read_lock(b);
|
||||
int64_t ref_count;
|
||||
@ -516,6 +555,14 @@ namespace {
|
||||
} catch (std::exception &e) {
|
||||
ref_count = -1;
|
||||
}
|
||||
|
||||
if (check_for_strings_) {
|
||||
auto ss = scan_strings(rr);
|
||||
if (ss) {
|
||||
strings_.insert(make_pair(b, *ss));
|
||||
}
|
||||
}
|
||||
|
||||
return factory_.convert_to_range(rr, ref_count);
|
||||
}
|
||||
|
||||
@ -531,17 +578,24 @@ namespace {
|
||||
std::unique_ptr<block_range> run_range_;
|
||||
|
||||
range_factory factory_;
|
||||
|
||||
bool check_for_strings_;
|
||||
map<block_address, vector<string>> strings_;
|
||||
};
|
||||
|
||||
//-------------------------------------------------------------------
|
||||
|
||||
struct flags {
|
||||
flags(): exclusive_(true) {
|
||||
flags()
|
||||
: exclusive_(true),
|
||||
examine_corruption_(false)
|
||||
{
|
||||
}
|
||||
|
||||
boost::optional<block_address> scan_begin_;
|
||||
boost::optional<block_address> scan_end_;
|
||||
bool exclusive_;
|
||||
bool examine_corruption_;
|
||||
};
|
||||
|
||||
int scan_metadata_(string const &input,
|
||||
@ -552,11 +606,26 @@ namespace {
|
||||
block_address scan_begin = f.scan_begin_ ? *f.scan_begin_ : 0;
|
||||
block_address scan_end = f.scan_end_ ? *f.scan_end_ : bm->get_nr_blocks();
|
||||
|
||||
metadata_scanner scanner(bm, scan_begin, scan_end);
|
||||
metadata_scanner scanner(bm, scan_begin, scan_end, f.examine_corruption_);
|
||||
std::unique_ptr<block_range> r;
|
||||
while ((r = scanner.get_range())) {
|
||||
out << *r << std::endl;
|
||||
}
|
||||
|
||||
if (f.examine_corruption_) {
|
||||
auto ss = scanner.get_strings();
|
||||
|
||||
for (auto const &ps : ss) {
|
||||
out << ps.first << ": ";
|
||||
|
||||
unsigned total = 0;
|
||||
for (auto const &s : ps.second)
|
||||
total += s.length();
|
||||
|
||||
out << total << " bytes of text\n";
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -592,6 +661,7 @@ thin_scan_cmd::usage(std::ostream &out) const {
|
||||
<< " {-o|--output} <xml file>\n"
|
||||
<< " {--begin} <block#>\n"
|
||||
<< " {--end} <block#>\n"
|
||||
<< " {--examine-corruption}\n"
|
||||
<< " {-V|--version}" << endl;
|
||||
}
|
||||
|
||||
@ -605,6 +675,7 @@ thin_scan_cmd::run(int argc, char **argv)
|
||||
{ "version", no_argument, NULL, 'V'},
|
||||
{ "begin", required_argument, NULL, 1},
|
||||
{ "end", required_argument, NULL, 2},
|
||||
{ "examine-corruption", no_argument, NULL, 3 },
|
||||
{ NULL, no_argument, NULL, 0 }
|
||||
};
|
||||
boost::optional<string> output;
|
||||
@ -643,6 +714,10 @@ thin_scan_cmd::run(int argc, char **argv)
|
||||
}
|
||||
break;
|
||||
|
||||
case 3:
|
||||
f.examine_corruption_ = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
usage(cerr);
|
||||
return 1;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user