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[thin_repair, cache_repair] Check input file exists earlier 

and zero superblock if we fail part way through a repair.

bz1499781
This commit is contained in:
Joe Thornber 2019-10-08 14:34:24 +01:00
parent a3b8e9db78
commit 1dd7b454bb
6 changed files with 72 additions and 11 deletions
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8
caching/cache_repair.cc
View File

@ -2,6 +2,7 @@
#include <getopt.h>
#include <libgen.h>
#include "base/file_utils.h"
#include "base/output_file_requirements.h"
#include "caching/commands.h"
#include "caching/metadata.h"
@ -29,12 +30,17 @@ namespace {
}
int repair(string const &old_path, string const &new_path) {
bool metadata_touched = false;
try {
file_utils::check_file_exists(new_path);
metadata_touched = true;
metadata_dump(open_metadata_for_read(old_path),
output_emitter(new_path),
true);
} catch (std::exception &e) {
if (metadata_touched)
file_utils::zero_superblock(new_path);
cerr << e.what() << endl;
return 1;
}
@ -110,7 +116,7 @@ cache_repair_cmd::run(int argc, char **argv)
check_output_file_requirements(*output_path);
else {
cerr << "no output file provided" << endl;
cerr << "No output file provided." << endl;
usage(cerr);
return 1;
}

32
functional-tests/cache-functional-tests.scm
View File

@ -15,6 +15,7 @@
(define-tool cache-dump)
(define-tool cache-restore)
(define-tool cache-metadata-size)
(define-tool cache-repair)
(define-syntax with-cache-xml
(syntax-rules ()
@ -35,7 +36,8 @@
(syntax-rules ()
((_ (md) b1 b2 ...)
(with-temp-file-sized ((md "cache.bin" (to-bytes (meg 4))))
b1 b2 ...))))
(system (fmt #f "dd if=/usr/bin/ls of=" md " bs=4096 > /dev/null 2>&1"))
b1 b2 ...))))
(define-syntax with-empty-metadata
(syntax-rules ()
@ -180,7 +182,7 @@
"the input file can't be found"
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (cache-restore "-i no-such-file -o" md)
(assert-superblock-untouched md)
(assert-superblock-all-zeroes md)
(assert-starts-with "Couldn't stat file" stderr))))
(define-scenario (cache-restore garbage-input-file)
@ -188,7 +190,7 @@
(with-empty-metadata (md)
(with-temp-file-sized ((xml "cache.xml" 4096))
(run-fail-rcv (_ stderr) (cache-restore "-i" xml "-o" md)
(assert-superblock-untouched md)))))
(assert-superblock-all-zeroes md)))))
(define-scenario (cache-restore missing-output-file)
"the output file can't be found"
@ -354,4 +356,28 @@
(run-ok-rcv (stdout stderr) (cache-metadata-size "--nr-blocks 67108864")
(assert-equal "3678208 sectors" stdout)
(assert-eof stderr)))
;;;-----------------------------------------------------------
;;; cache_repair scenarios
;;;-----------------------------------------------------------
(define-scenario (cache-repair missing-input-file)
"the input file can't be found"
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (cache-repair "-i no-such-file -o" md)
(assert-superblock-all-zeroes md)
(assert-starts-with "Couldn't stat path" stderr))))
(define-scenario (cache-repair garbage-input-file)
"the input file is just zeroes"
(with-empty-metadata (md1)
(with-corrupt-metadata (md2)
(run-fail-rcv (_ stderr) (cache-repair "-i" md1 "-o" md2)
(assert-superblock-all-zeroes md2)))))
(define-scenario (cache-repair missing-output-file)
"the output file can't be found"
(with-cache-xml (xml)
(run-fail-rcv (_ stderr) (cache-repair "-i" xml)
(assert-starts-with "No output file provided." stderr))))
)

4
functional-tests/era-functional-tests.scm
View File

@ -153,7 +153,7 @@
"the input file can't be found"
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (era-restore "-i no-such-file -o" md)
(assert-superblock-untouched md)
(assert-superblock-all-zeroes md)
(assert-starts-with "Couldn't stat file" stderr))))
(define-scenario (era-restore garbage-input-file)
@ -161,7 +161,7 @@
(with-empty-metadata (md)
(with-temp-file-sized ((xml "era.xml" 4096))
(run-fail-rcv (_ stderr) (era-restore "-i " xml "-o" md)
(assert-superblock-untouched md)))))
(assert-superblock-all-zeroes md)))))
(define-scenario (era-restore output-unspecified)
"Fails if no metadata dev specified"

4
functional-tests/functional-tests.scm
View File

@ -21,7 +21,7 @@
assert-eof
assert-starts-with
assert-matches
assert-superblock-untouched
assert-superblock-all-zeroes
assert-member?
assert-raises-thunk
assert-raises
@ -259,7 +259,7 @@
(loop (+ i 1))
#f)))))
(define (assert-superblock-untouched md)
(define (assert-superblock-all-zeroes md)
(with-bcache (cache md 1)
(with-block (b cache 0 (get-flags))
(unless (all-zeroes? (block-data b) 4096)

27
functional-tests/thin-functional-tests.scm
View File

@ -37,10 +37,12 @@
b1 b2 ...)))))
;;; It would be nice if the metadata was at least similar to valid data.
;;; Here I'm just using the start of the ls binary as 'random' data.
(define-syntax with-corrupt-metadata
(syntax-rules ()
((_ (md) b1 b2 ...)
(with-temp-file-sized ((md "thin.bin" (meg 4)))
(system (fmt #f "dd if=/usr/bin/ls of=" md " bs=4096 > /dev/null 2>&1"))
b1 b2 ...))))
(define-syntax with-empty-metadata
@ -167,7 +169,7 @@
"the input file can't be found"
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (thin-restore "-i no-such-file -o" md)
(assert-superblock-untouched md)
(assert-superblock-all-zeroes md)
(assert-starts-with "Couldn't stat file" stderr))))
(define-scenario (thin-restore garbage-input-file)
@ -175,7 +177,7 @@
(with-empty-metadata (md)
(with-temp-file-sized ((xml "thin.xml" 4096))
(run-fail-rcv (_ stderr) (thin-restore "-i " xml "-o" md)
(assert-superblock-untouched md)))))
(assert-superblock-all-zeroes md)))))
(define-scenario (thin-restore missing-output-file)
"the output file can't be found"
@ -333,4 +335,25 @@
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (thin-repair "-i" xml "-o" md)
#t))))
(define-scenario (thin-repair missing-input-file)
"the input file can't be found"
(with-empty-metadata (md)
(run-fail-rcv (_ stderr) (thin-repair "-i no-such-file -o" md)
(assert-superblock-all-zeroes md)
(assert-starts-with "Couldn't stat file" stderr))))
(define-scenario (thin-repair garbage-input-file)
"the input file is just zeroes"
(with-empty-metadata (md1)
(with-corrupt-metadata (md2)
(run-fail-rcv (_ stderr) (thin-repair "-i " md1 "-o" md2)
(assert-superblock-all-zeroes md2)))))
(define-scenario (thin-repair missing-output-file)
"the output file can't be found"
(with-thin-xml (xml)
(run-fail-rcv (_ stderr) (thin-repair "-i " xml)
(assert-starts-with "No output file provided." stderr))))
)

8
thin-provisioning/thin_repair.cc
View File

@ -2,6 +2,7 @@
#include <getopt.h>
#include <libgen.h>
#include "base/file_utils.h"
#include "base/output_file_requirements.h"
#include "persistent-data/file_utils.h"
#include "thin-provisioning/commands.h"
@ -17,15 +18,20 @@ using namespace thin_provisioning;
namespace {
int repair(string const &old_path, string const &new_path) {
bool metadata_touched = false;
try {
// block size gets updated by the restorer
block_manager<>::ptr new_bm = open_bm(new_path, block_manager<>::READ_WRITE);
file_utils::check_file_exists(old_path);
metadata_touched = true;
metadata::ptr new_md(new metadata(new_bm, metadata::CREATE, 128, 0));
emitter::ptr e = create_restore_emitter(new_md);
block_manager<>::ptr old_bm = open_bm(old_path, block_manager<>::READ_ONLY);
metadata_repair(old_bm, e);
} catch (std::exception &e) {
if (metadata_touched)
file_utils::zero_superblock(new_path);
cerr << e.what() << endl;
return 1;
}
@ -101,7 +107,7 @@ thin_repair_cmd::run(int argc, char **argv)
check_output_file_requirements(*output_path);
else {
cerr << "no output file provided" << endl;
cerr << "No output file provided." << endl;
usage(cerr);
return 1;
}