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![Mikulas Patocka](/assets/img/avatar_default.png)
The random_read_corrupt and random_write_corrupt options corrupt a random byte in a bio with the provided probability. The corruption only happens in the "down" interval. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
694 lines
17 KiB
C
694 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2003 Sistina Software (UK) Limited.
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* Copyright (C) 2004, 2010-2011 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#include <linux/device-mapper.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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#define DM_MSG_PREFIX "flakey"
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#define PROBABILITY_BASE 1000000000
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#define all_corrupt_bio_flags_match(bio, fc) \
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(((bio)->bi_opf & (fc)->corrupt_bio_flags) == (fc)->corrupt_bio_flags)
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/*
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* Flakey: Used for testing only, simulates intermittent,
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* catastrophic device failure.
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*/
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struct flakey_c {
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struct dm_dev *dev;
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unsigned long start_time;
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sector_t start;
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unsigned int up_interval;
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unsigned int down_interval;
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unsigned long flags;
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unsigned int corrupt_bio_byte;
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unsigned int corrupt_bio_rw;
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unsigned int corrupt_bio_value;
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blk_opf_t corrupt_bio_flags;
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unsigned int random_read_corrupt;
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unsigned int random_write_corrupt;
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};
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enum feature_flag_bits {
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ERROR_READS,
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DROP_WRITES,
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ERROR_WRITES
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};
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struct per_bio_data {
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bool bio_submitted;
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};
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static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
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struct dm_target *ti)
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{
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int r;
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unsigned int argc;
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const char *arg_name;
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static const struct dm_arg _args[] = {
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{0, 11, "Invalid number of feature args"},
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{1, UINT_MAX, "Invalid corrupt bio byte"},
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{0, 255, "Invalid corrupt value to write into bio byte (0-255)"},
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{0, UINT_MAX, "Invalid corrupt bio flags mask"},
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{0, PROBABILITY_BASE, "Invalid random corrupt argument"},
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};
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/* No feature arguments supplied. */
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if (!as->argc)
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return 0;
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r = dm_read_arg_group(_args, as, &argc, &ti->error);
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if (r)
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return r;
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while (argc) {
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arg_name = dm_shift_arg(as);
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argc--;
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if (!arg_name) {
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ti->error = "Insufficient feature arguments";
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return -EINVAL;
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}
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/*
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* error_reads
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*/
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if (!strcasecmp(arg_name, "error_reads")) {
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if (test_and_set_bit(ERROR_READS, &fc->flags)) {
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ti->error = "Feature error_reads duplicated";
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return -EINVAL;
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}
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continue;
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}
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/*
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* drop_writes
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*/
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if (!strcasecmp(arg_name, "drop_writes")) {
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if (test_and_set_bit(DROP_WRITES, &fc->flags)) {
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ti->error = "Feature drop_writes duplicated";
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return -EINVAL;
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} else if (test_bit(ERROR_WRITES, &fc->flags)) {
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ti->error = "Feature drop_writes conflicts with feature error_writes";
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return -EINVAL;
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}
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continue;
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}
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/*
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* error_writes
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*/
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if (!strcasecmp(arg_name, "error_writes")) {
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if (test_and_set_bit(ERROR_WRITES, &fc->flags)) {
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ti->error = "Feature error_writes duplicated";
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return -EINVAL;
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} else if (test_bit(DROP_WRITES, &fc->flags)) {
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ti->error = "Feature error_writes conflicts with feature drop_writes";
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return -EINVAL;
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}
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continue;
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}
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/*
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* corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>
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*/
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if (!strcasecmp(arg_name, "corrupt_bio_byte")) {
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if (!argc) {
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ti->error = "Feature corrupt_bio_byte requires parameters";
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return -EINVAL;
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}
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r = dm_read_arg(_args + 1, as, &fc->corrupt_bio_byte, &ti->error);
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if (r)
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return r;
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argc--;
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/*
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* Direction r or w?
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*/
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arg_name = dm_shift_arg(as);
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if (arg_name && !strcasecmp(arg_name, "w"))
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fc->corrupt_bio_rw = WRITE;
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else if (arg_name && !strcasecmp(arg_name, "r"))
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fc->corrupt_bio_rw = READ;
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else {
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ti->error = "Invalid corrupt bio direction (r or w)";
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return -EINVAL;
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}
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argc--;
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/*
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* Value of byte (0-255) to write in place of correct one.
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*/
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r = dm_read_arg(_args + 2, as, &fc->corrupt_bio_value, &ti->error);
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if (r)
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return r;
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argc--;
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/*
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* Only corrupt bios with these flags set.
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*/
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BUILD_BUG_ON(sizeof(fc->corrupt_bio_flags) !=
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sizeof(unsigned int));
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r = dm_read_arg(_args + 3, as,
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(__force unsigned int *)&fc->corrupt_bio_flags,
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&ti->error);
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if (r)
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return r;
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argc--;
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continue;
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}
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if (!strcasecmp(arg_name, "random_read_corrupt")) {
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if (!argc) {
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ti->error = "Feature random_read_corrupt requires a parameter";
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return -EINVAL;
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}
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r = dm_read_arg(_args + 4, as, &fc->random_read_corrupt, &ti->error);
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if (r)
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return r;
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argc--;
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continue;
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}
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if (!strcasecmp(arg_name, "random_write_corrupt")) {
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if (!argc) {
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ti->error = "Feature random_write_corrupt requires a parameter";
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return -EINVAL;
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}
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r = dm_read_arg(_args + 4, as, &fc->random_write_corrupt, &ti->error);
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if (r)
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return r;
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argc--;
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continue;
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}
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ti->error = "Unrecognised flakey feature requested";
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return -EINVAL;
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}
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if (test_bit(DROP_WRITES, &fc->flags) && (fc->corrupt_bio_rw == WRITE)) {
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ti->error = "drop_writes is incompatible with corrupt_bio_byte with the WRITE flag set";
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return -EINVAL;
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} else if (test_bit(ERROR_WRITES, &fc->flags) && (fc->corrupt_bio_rw == WRITE)) {
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ti->error = "error_writes is incompatible with corrupt_bio_byte with the WRITE flag set";
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return -EINVAL;
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}
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if (!fc->corrupt_bio_byte && !test_bit(ERROR_READS, &fc->flags) &&
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!test_bit(DROP_WRITES, &fc->flags) && !test_bit(ERROR_WRITES, &fc->flags) &&
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!fc->random_read_corrupt && !fc->random_write_corrupt) {
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set_bit(ERROR_WRITES, &fc->flags);
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set_bit(ERROR_READS, &fc->flags);
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}
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return 0;
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}
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/*
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* Construct a flakey mapping:
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* <dev_path> <offset> <up interval> <down interval> [<#feature args> [<arg>]*]
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*
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* Feature args:
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* [drop_writes]
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* [corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>]
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*
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* Nth_byte starts from 1 for the first byte.
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* Direction is r for READ or w for WRITE.
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* bio_flags is ignored if 0.
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*/
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static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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{
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static const struct dm_arg _args[] = {
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{0, UINT_MAX, "Invalid up interval"},
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{0, UINT_MAX, "Invalid down interval"},
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};
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int r;
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struct flakey_c *fc;
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unsigned long long tmpll;
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struct dm_arg_set as;
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const char *devname;
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char dummy;
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as.argc = argc;
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as.argv = argv;
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if (argc < 4) {
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ti->error = "Invalid argument count";
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return -EINVAL;
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}
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fc = kzalloc(sizeof(*fc), GFP_KERNEL);
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if (!fc) {
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ti->error = "Cannot allocate context";
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return -ENOMEM;
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}
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fc->start_time = jiffies;
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devname = dm_shift_arg(&as);
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r = -EINVAL;
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if (sscanf(dm_shift_arg(&as), "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
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ti->error = "Invalid device sector";
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goto bad;
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}
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fc->start = tmpll;
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r = dm_read_arg(_args, &as, &fc->up_interval, &ti->error);
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if (r)
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goto bad;
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r = dm_read_arg(_args, &as, &fc->down_interval, &ti->error);
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if (r)
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goto bad;
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if (!(fc->up_interval + fc->down_interval)) {
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ti->error = "Total (up + down) interval is zero";
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r = -EINVAL;
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goto bad;
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}
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if (fc->up_interval + fc->down_interval < fc->up_interval) {
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ti->error = "Interval overflow";
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r = -EINVAL;
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goto bad;
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}
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r = parse_features(&as, fc, ti);
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if (r)
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goto bad;
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r = dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev);
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if (r) {
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ti->error = "Device lookup failed";
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goto bad;
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}
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ti->num_flush_bios = 1;
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ti->num_discard_bios = 1;
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ti->per_io_data_size = sizeof(struct per_bio_data);
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ti->private = fc;
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return 0;
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bad:
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kfree(fc);
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return r;
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}
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static void flakey_dtr(struct dm_target *ti)
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{
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struct flakey_c *fc = ti->private;
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dm_put_device(ti, fc->dev);
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kfree(fc);
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}
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static sector_t flakey_map_sector(struct dm_target *ti, sector_t bi_sector)
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{
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struct flakey_c *fc = ti->private;
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return fc->start + dm_target_offset(ti, bi_sector);
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}
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static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
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{
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struct flakey_c *fc = ti->private;
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bio_set_dev(bio, fc->dev->bdev);
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bio->bi_iter.bi_sector = flakey_map_sector(ti, bio->bi_iter.bi_sector);
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}
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static void corrupt_bio_common(struct bio *bio, unsigned int corrupt_bio_byte,
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unsigned char corrupt_bio_value)
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{
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struct bvec_iter iter;
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struct bio_vec bvec;
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/*
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* Overwrite the Nth byte of the bio's data, on whichever page
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* it falls.
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*/
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bio_for_each_segment(bvec, bio, iter) {
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if (bio_iter_len(bio, iter) > corrupt_bio_byte) {
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unsigned char *segment = bvec_kmap_local(&bvec);
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segment[corrupt_bio_byte] = corrupt_bio_value;
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kunmap_local(segment);
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DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
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"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
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bio, corrupt_bio_value, corrupt_bio_byte,
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(bio_data_dir(bio) == WRITE) ? 'w' : 'r', bio->bi_opf,
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(unsigned long long)bio->bi_iter.bi_sector,
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bio->bi_iter.bi_size);
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break;
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}
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corrupt_bio_byte -= bio_iter_len(bio, iter);
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}
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}
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static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
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{
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unsigned int corrupt_bio_byte = fc->corrupt_bio_byte - 1;
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if (!bio_has_data(bio))
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return;
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corrupt_bio_common(bio, corrupt_bio_byte, fc->corrupt_bio_value);
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}
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static void corrupt_bio_random(struct bio *bio)
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{
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unsigned int corrupt_byte;
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unsigned char corrupt_value;
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if (!bio_has_data(bio))
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return;
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corrupt_byte = get_random_u32() % bio->bi_iter.bi_size;
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corrupt_value = get_random_u8();
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corrupt_bio_common(bio, corrupt_byte, corrupt_value);
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}
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static void clone_free(struct bio *clone)
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{
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struct folio_iter fi;
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if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */
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bio_for_each_folio_all(fi, clone)
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folio_put(fi.folio);
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}
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bio_uninit(clone);
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kfree(clone);
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}
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static void clone_endio(struct bio *clone)
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{
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struct bio *bio = clone->bi_private;
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bio->bi_status = clone->bi_status;
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clone_free(clone);
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bio_endio(bio);
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}
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static struct bio *clone_bio(struct dm_target *ti, struct flakey_c *fc, struct bio *bio)
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{
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struct bio *clone;
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unsigned size, remaining_size, nr_iovecs, order;
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struct bvec_iter iter = bio->bi_iter;
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if (unlikely(bio->bi_iter.bi_size > UIO_MAXIOV << PAGE_SHIFT))
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dm_accept_partial_bio(bio, UIO_MAXIOV << PAGE_SHIFT >> SECTOR_SHIFT);
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size = bio->bi_iter.bi_size;
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nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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clone = bio_kmalloc(nr_iovecs, GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
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if (!clone)
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return NULL;
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bio_init(clone, fc->dev->bdev, bio->bi_inline_vecs, nr_iovecs, bio->bi_opf);
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clone->bi_iter.bi_sector = flakey_map_sector(ti, bio->bi_iter.bi_sector);
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clone->bi_private = bio;
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clone->bi_end_io = clone_endio;
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remaining_size = size;
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order = MAX_ORDER - 1;
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while (remaining_size) {
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struct page *pages;
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unsigned size_to_add, to_copy;
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unsigned char *virt;
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unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT);
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order = min(order, remaining_order);
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retry_alloc_pages:
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pages = alloc_pages(GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP, order);
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if (unlikely(!pages)) {
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if (order) {
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order--;
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goto retry_alloc_pages;
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}
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clone_free(clone);
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return NULL;
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}
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size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size);
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virt = page_to_virt(pages);
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to_copy = size_to_add;
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do {
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struct bio_vec bvec = bvec_iter_bvec(bio->bi_io_vec, iter);
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unsigned this_step = min(bvec.bv_len, to_copy);
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void *map = bvec_kmap_local(&bvec);
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memcpy(virt, map, this_step);
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kunmap_local(map);
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bvec_iter_advance(bio->bi_io_vec, &iter, this_step);
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to_copy -= this_step;
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virt += this_step;
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} while (to_copy);
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__bio_add_page(clone, pages, size_to_add, 0);
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remaining_size -= size_to_add;
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}
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return clone;
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}
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static int flakey_map(struct dm_target *ti, struct bio *bio)
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{
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struct flakey_c *fc = ti->private;
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unsigned int elapsed;
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struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
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pb->bio_submitted = false;
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if (op_is_zone_mgmt(bio_op(bio)))
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goto map_bio;
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/* Are we alive ? */
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elapsed = (jiffies - fc->start_time) / HZ;
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if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval) {
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bool corrupt_fixed, corrupt_random;
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/*
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* Flag this bio as submitted while down.
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*/
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pb->bio_submitted = true;
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/*
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* Error reads if neither corrupt_bio_byte or drop_writes or error_writes are set.
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* Otherwise, flakey_end_io() will decide if the reads should be modified.
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*/
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if (bio_data_dir(bio) == READ) {
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if (test_bit(ERROR_READS, &fc->flags))
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return DM_MAPIO_KILL;
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goto map_bio;
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}
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/*
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* Drop or error writes?
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*/
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if (test_bit(DROP_WRITES, &fc->flags)) {
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bio_endio(bio);
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return DM_MAPIO_SUBMITTED;
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} else if (test_bit(ERROR_WRITES, &fc->flags)) {
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bio_io_error(bio);
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return DM_MAPIO_SUBMITTED;
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}
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/*
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* Corrupt matching writes.
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*/
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corrupt_fixed = false;
|
|
corrupt_random = false;
|
|
if (fc->corrupt_bio_byte && fc->corrupt_bio_rw == WRITE) {
|
|
if (all_corrupt_bio_flags_match(bio, fc))
|
|
corrupt_fixed = true;
|
|
}
|
|
if (fc->random_write_corrupt) {
|
|
u64 rnd = get_random_u64();
|
|
u32 rem = do_div(rnd, PROBABILITY_BASE);
|
|
if (rem < fc->random_write_corrupt)
|
|
corrupt_random = true;
|
|
}
|
|
if (corrupt_fixed || corrupt_random) {
|
|
struct bio *clone = clone_bio(ti, fc, bio);
|
|
if (clone) {
|
|
if (corrupt_fixed)
|
|
corrupt_bio_data(clone, fc);
|
|
if (corrupt_random)
|
|
corrupt_bio_random(clone);
|
|
submit_bio(clone);
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
}
|
|
}
|
|
|
|
map_bio:
|
|
flakey_map_bio(ti, bio);
|
|
|
|
return DM_MAPIO_REMAPPED;
|
|
}
|
|
|
|
static int flakey_end_io(struct dm_target *ti, struct bio *bio,
|
|
blk_status_t *error)
|
|
{
|
|
struct flakey_c *fc = ti->private;
|
|
struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
|
|
|
|
if (op_is_zone_mgmt(bio_op(bio)))
|
|
return DM_ENDIO_DONE;
|
|
|
|
if (!*error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
|
|
if (fc->corrupt_bio_byte) {
|
|
if ((fc->corrupt_bio_rw == READ) &&
|
|
all_corrupt_bio_flags_match(bio, fc)) {
|
|
/*
|
|
* Corrupt successful matching READs while in down state.
|
|
*/
|
|
corrupt_bio_data(bio, fc);
|
|
}
|
|
}
|
|
if (fc->random_read_corrupt) {
|
|
u64 rnd = get_random_u64();
|
|
u32 rem = do_div(rnd, PROBABILITY_BASE);
|
|
if (rem < fc->random_read_corrupt)
|
|
corrupt_bio_random(bio);
|
|
}
|
|
if (test_bit(ERROR_READS, &fc->flags)) {
|
|
/*
|
|
* Error read during the down_interval if drop_writes
|
|
* and error_writes were not configured.
|
|
*/
|
|
*error = BLK_STS_IOERR;
|
|
}
|
|
}
|
|
|
|
return DM_ENDIO_DONE;
|
|
}
|
|
|
|
static void flakey_status(struct dm_target *ti, status_type_t type,
|
|
unsigned int status_flags, char *result, unsigned int maxlen)
|
|
{
|
|
unsigned int sz = 0;
|
|
struct flakey_c *fc = ti->private;
|
|
unsigned int error_reads, drop_writes, error_writes;
|
|
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
result[0] = '\0';
|
|
break;
|
|
|
|
case STATUSTYPE_TABLE:
|
|
DMEMIT("%s %llu %u %u", fc->dev->name,
|
|
(unsigned long long)fc->start, fc->up_interval,
|
|
fc->down_interval);
|
|
|
|
error_reads = test_bit(ERROR_READS, &fc->flags);
|
|
drop_writes = test_bit(DROP_WRITES, &fc->flags);
|
|
error_writes = test_bit(ERROR_WRITES, &fc->flags);
|
|
DMEMIT(" %u", error_reads + drop_writes + error_writes +
|
|
(fc->corrupt_bio_byte > 0) * 5 +
|
|
(fc->random_read_corrupt > 0) * 2 +
|
|
(fc->random_write_corrupt > 0) * 2);
|
|
|
|
if (error_reads)
|
|
DMEMIT(" error_reads");
|
|
if (drop_writes)
|
|
DMEMIT(" drop_writes");
|
|
else if (error_writes)
|
|
DMEMIT(" error_writes");
|
|
|
|
if (fc->corrupt_bio_byte)
|
|
DMEMIT(" corrupt_bio_byte %u %c %u %u",
|
|
fc->corrupt_bio_byte,
|
|
(fc->corrupt_bio_rw == WRITE) ? 'w' : 'r',
|
|
fc->corrupt_bio_value, fc->corrupt_bio_flags);
|
|
|
|
if (fc->random_read_corrupt > 0)
|
|
DMEMIT(" random_read_corrupt %u", fc->random_read_corrupt);
|
|
if (fc->random_write_corrupt > 0)
|
|
DMEMIT(" random_write_corrupt %u", fc->random_write_corrupt);
|
|
|
|
break;
|
|
|
|
case STATUSTYPE_IMA:
|
|
result[0] = '\0';
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int flakey_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
|
|
{
|
|
struct flakey_c *fc = ti->private;
|
|
|
|
*bdev = fc->dev->bdev;
|
|
|
|
/*
|
|
* Only pass ioctls through if the device sizes match exactly.
|
|
*/
|
|
if (fc->start || ti->len != bdev_nr_sectors((*bdev)))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
static int flakey_report_zones(struct dm_target *ti,
|
|
struct dm_report_zones_args *args, unsigned int nr_zones)
|
|
{
|
|
struct flakey_c *fc = ti->private;
|
|
|
|
return dm_report_zones(fc->dev->bdev, fc->start,
|
|
flakey_map_sector(ti, args->next_sector),
|
|
args, nr_zones);
|
|
}
|
|
#else
|
|
#define flakey_report_zones NULL
|
|
#endif
|
|
|
|
static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
struct flakey_c *fc = ti->private;
|
|
|
|
return fn(ti, fc->dev, fc->start, ti->len, data);
|
|
}
|
|
|
|
static struct target_type flakey_target = {
|
|
.name = "flakey",
|
|
.version = {1, 5, 0},
|
|
.features = DM_TARGET_ZONED_HM | DM_TARGET_PASSES_CRYPTO,
|
|
.report_zones = flakey_report_zones,
|
|
.module = THIS_MODULE,
|
|
.ctr = flakey_ctr,
|
|
.dtr = flakey_dtr,
|
|
.map = flakey_map,
|
|
.end_io = flakey_end_io,
|
|
.status = flakey_status,
|
|
.prepare_ioctl = flakey_prepare_ioctl,
|
|
.iterate_devices = flakey_iterate_devices,
|
|
};
|
|
module_dm(flakey);
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " flakey target");
|
|
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|