mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 04:56:39 +07:00
ef548c551e
Recent dm-flakey fixes, to have reads error out during the "down" interval, made it so that the previous read behaviour is no longer available. It is useful to have reads complete like normal but have writes error out, so make it possible again with a new "error_writes" feature. Signed-off-by: Mike Snitzer <snitzer@redhat.com>
481 lines
11 KiB
C
481 lines
11 KiB
C
/*
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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 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 up_interval;
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unsigned down_interval;
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unsigned long flags;
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unsigned corrupt_bio_byte;
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unsigned corrupt_bio_rw;
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unsigned corrupt_bio_value;
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unsigned corrupt_bio_flags;
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};
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enum feature_flag_bits {
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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 argc;
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const char *arg_name;
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static struct dm_arg _args[] = {
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{0, 6, "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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};
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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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/*
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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 (!strcasecmp(arg_name, "w"))
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fc->corrupt_bio_rw = WRITE;
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else if (!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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r = dm_read_arg(_args + 3, as, &fc->corrupt_bio_flags, &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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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 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) {
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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->bi_bdev = fc->dev->bdev;
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if (bio_sectors(bio))
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bio->bi_iter.bi_sector =
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flakey_map_sector(ti, bio->bi_iter.bi_sector);
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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 bio_bytes = bio_cur_bytes(bio);
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char *data = bio_data(bio);
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/*
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* Overwrite the Nth byte of the data returned.
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*/
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if (data && bio_bytes >= fc->corrupt_bio_byte) {
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data[fc->corrupt_bio_byte - 1] = fc->corrupt_bio_value;
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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 cur_bytes=%u)\n",
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bio, fc->corrupt_bio_value, fc->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, bio_bytes);
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}
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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 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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/* 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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/*
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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 (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags) &&
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!test_bit(ERROR_WRITES, &fc->flags))
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return -EIO;
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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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}
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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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if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == WRITE)) {
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if (all_corrupt_bio_flags_match(bio, fc))
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corrupt_bio_data(bio, fc);
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goto map_bio;
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}
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/*
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* By default, error all I/O.
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*/
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return -EIO;
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}
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map_bio:
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flakey_map_bio(ti, bio);
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return DM_MAPIO_REMAPPED;
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}
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static int flakey_end_io(struct dm_target *ti, struct bio *bio, int error)
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{
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struct flakey_c *fc = ti->private;
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struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
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if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
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if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
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all_corrupt_bio_flags_match(bio, fc)) {
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/*
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* Corrupt successful matching READs while in down state.
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*/
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corrupt_bio_data(bio, fc);
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} else if (!test_bit(DROP_WRITES, &fc->flags) &&
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!test_bit(ERROR_WRITES, &fc->flags)) {
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/*
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* Error read during the down_interval if drop_writes
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* and error_writes were not configured.
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*/
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return -EIO;
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}
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}
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return error;
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}
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static void flakey_status(struct dm_target *ti, status_type_t type,
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unsigned status_flags, char *result, unsigned maxlen)
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{
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unsigned sz = 0;
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struct flakey_c *fc = ti->private;
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unsigned drop_writes, error_writes;
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switch (type) {
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case STATUSTYPE_INFO:
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result[0] = '\0';
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break;
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case STATUSTYPE_TABLE:
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DMEMIT("%s %llu %u %u ", fc->dev->name,
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(unsigned long long)fc->start, fc->up_interval,
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fc->down_interval);
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drop_writes = test_bit(DROP_WRITES, &fc->flags);
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error_writes = test_bit(ERROR_WRITES, &fc->flags);
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DMEMIT("%u ", drop_writes + error_writes + (fc->corrupt_bio_byte > 0) * 5);
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if (drop_writes)
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DMEMIT("drop_writes ");
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else if (error_writes)
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DMEMIT("error_writes ");
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if (fc->corrupt_bio_byte)
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DMEMIT("corrupt_bio_byte %u %c %u %u ",
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fc->corrupt_bio_byte,
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(fc->corrupt_bio_rw == WRITE) ? 'w' : 'r',
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fc->corrupt_bio_value, fc->corrupt_bio_flags);
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break;
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}
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}
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static int flakey_prepare_ioctl(struct dm_target *ti,
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struct block_device **bdev, fmode_t *mode)
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{
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struct flakey_c *fc = ti->private;
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*bdev = fc->dev->bdev;
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/*
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* Only pass ioctls through if the device sizes match exactly.
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*/
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if (fc->start ||
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ti->len != i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT)
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return 1;
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return 0;
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}
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static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
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{
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struct flakey_c *fc = ti->private;
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return fn(ti, fc->dev, fc->start, ti->len, data);
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}
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static struct target_type flakey_target = {
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.name = "flakey",
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.version = {1, 4, 0},
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.module = THIS_MODULE,
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.ctr = flakey_ctr,
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.dtr = flakey_dtr,
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.map = flakey_map,
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.end_io = flakey_end_io,
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.status = flakey_status,
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.prepare_ioctl = flakey_prepare_ioctl,
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.iterate_devices = flakey_iterate_devices,
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};
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static int __init dm_flakey_init(void)
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{
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int r = dm_register_target(&flakey_target);
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if (r < 0)
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DMERR("register failed %d", r);
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return r;
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}
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static void __exit dm_flakey_exit(void)
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{
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dm_unregister_target(&flakey_target);
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}
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/* Module hooks */
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module_init(dm_flakey_init);
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module_exit(dm_flakey_exit);
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MODULE_DESCRIPTION(DM_NAME " flakey target");
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MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
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MODULE_LICENSE("GPL");
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