2011-03-24 14:54:24 +01:00
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/*
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* Copyright (C) 2003 Sistina Software (UK) Limited.
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2011-08-02 13:32:06 +02:00
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* Copyright (C) 2004, 2010-2011 Red Hat, Inc. All rights reserved.
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2011-03-24 14:54:24 +01:00
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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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2011-08-02 13:32:06 +02:00
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#define all_corrupt_bio_flags_match(bio, fc) \
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(((bio)->bi_rw & (fc)->corrupt_bio_flags) == (fc)->corrupt_bio_flags)
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2011-03-24 14:54:24 +01:00
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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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2011-08-02 13:32:05 +02:00
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unsigned long flags;
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2011-08-02 13:32:06 +02:00
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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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2011-03-24 14:54:24 +01:00
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};
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2011-08-02 13:32:05 +02:00
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enum feature_flag_bits {
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DROP_WRITES
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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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2011-08-02 13:32:05 +02:00
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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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2011-08-02 13:32:06 +02:00
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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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2011-08-02 13:32:05 +02:00
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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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2011-08-02 13:32:06 +02:00
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return r;
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2011-08-02 13:32:05 +02:00
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2011-08-02 13:32:06 +02:00
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while (argc) {
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2011-08-02 13:32:05 +02:00
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arg_name = dm_shift_arg(as);
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argc--;
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2011-08-02 13:32:05 +02:00
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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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}
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continue;
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}
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2011-08-02 13:32:06 +02:00
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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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2011-09-26 00:26:15 +02:00
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if (!argc) {
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2011-08-02 13:32:06 +02:00
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ti->error = "Feature corrupt_bio_byte requires parameters";
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2011-09-26 00:26:15 +02:00
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return -EINVAL;
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}
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2011-08-02 13:32:06 +02:00
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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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2011-08-02 13:32:05 +02:00
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ti->error = "Unrecognised flakey feature requested";
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2011-08-02 13:32:06 +02:00
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return -EINVAL;
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2011-08-02 13:32:05 +02:00
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}
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2011-08-02 13:32:06 +02:00
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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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}
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return 0;
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2011-08-02 13:32:05 +02:00
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}
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2011-03-24 14:54:24 +01:00
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/*
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2011-08-02 13:32:05 +02:00
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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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2011-08-02 13:32:05 +02:00
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*
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* Feature args:
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* [drop_writes]
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2011-08-02 13:32:06 +02:00
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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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2011-03-24 14:54:24 +01:00
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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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2011-08-02 13:32:05 +02:00
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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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2011-03-24 14:54:24 +01:00
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struct flakey_c *fc;
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2011-08-02 13:32:05 +02:00
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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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dm: reject trailing characters in sccanf input
Device mapper uses sscanf to convert arguments to numbers. The problem is that
the way we use it ignores additional unmatched characters in the scanned string.
For example, this `if (sscanf(string, "%d", &number) == 1)' will match a number,
but also it will match number with some garbage appended, like "123abc".
As a result, device mapper accepts garbage after some numbers. For example
the command `dmsetup create vg1-new --table "0 16384 linear 254:1bla 34816bla"'
will pass without an error.
This patch fixes all sscanf uses in device mapper. It appends "%c" with
a pointer to a dummy character variable to every sscanf statement.
The construct `if (sscanf(string, "%d%c", &number, &dummy) == 1)' succeeds
only if string is a null-terminated number (optionally preceded by some
whitespace characters). If there is some character appended after the number,
sscanf matches "%c", writes the character to the dummy variable and returns 2.
We check the return value for 1 and consequently reject numbers with some
garbage appended.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-03-28 19:41:26 +02:00
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char dummy;
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2011-03-24 14:54:24 +01:00
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2011-08-02 13:32:05 +02:00
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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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2011-03-24 14:54:24 +01:00
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return -EINVAL;
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}
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2011-08-02 13:32:05 +02:00
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fc = kzalloc(sizeof(*fc), GFP_KERNEL);
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2011-03-24 14:54:24 +01:00
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if (!fc) {
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2011-08-02 13:32:05 +02:00
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ti->error = "Cannot allocate linear context";
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2011-03-24 14:54:24 +01:00
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return -ENOMEM;
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}
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fc->start_time = jiffies;
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2011-08-02 13:32:05 +02:00
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devname = dm_shift_arg(&as);
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dm: reject trailing characters in sccanf input
Device mapper uses sscanf to convert arguments to numbers. The problem is that
the way we use it ignores additional unmatched characters in the scanned string.
For example, this `if (sscanf(string, "%d", &number) == 1)' will match a number,
but also it will match number with some garbage appended, like "123abc".
As a result, device mapper accepts garbage after some numbers. For example
the command `dmsetup create vg1-new --table "0 16384 linear 254:1bla 34816bla"'
will pass without an error.
This patch fixes all sscanf uses in device mapper. It appends "%c" with
a pointer to a dummy character variable to every sscanf statement.
The construct `if (sscanf(string, "%d%c", &number, &dummy) == 1)' succeeds
only if string is a null-terminated number (optionally preceded by some
whitespace characters). If there is some character appended after the number,
sscanf matches "%c", writes the character to the dummy variable and returns 2.
We check the return value for 1 and consequently reject numbers with some
garbage appended.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-03-28 19:41:26 +02:00
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if (sscanf(dm_shift_arg(&as), "%llu%c", &tmpll, &dummy) != 1) {
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2011-08-02 13:32:05 +02:00
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ti->error = "Invalid device sector";
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2011-03-24 14:54:24 +01:00
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goto bad;
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}
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2011-08-02 13:32:05 +02:00
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fc->start = tmpll;
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2011-03-24 14:54:24 +01:00
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2011-08-02 13:32:05 +02:00
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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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2011-03-24 14:54:24 +01:00
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goto bad;
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2011-08-02 13:32:05 +02:00
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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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2011-03-24 14:54:24 +01:00
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goto bad;
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if (!(fc->up_interval + fc->down_interval)) {
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2011-08-02 13:32:05 +02:00
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ti->error = "Total (up + down) interval is zero";
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2011-03-24 14:54:24 +01:00
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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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2011-08-02 13:32:05 +02:00
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ti->error = "Interval overflow";
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2011-03-24 14:54:24 +01:00
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goto bad;
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}
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2011-08-02 13:32:05 +02:00
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r = parse_features(&as, fc, ti);
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2011-08-02 13:32:05 +02:00
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if (r)
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goto bad;
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if (dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev)) {
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ti->error = "Device lookup failed";
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2011-03-24 14:54:24 +01:00
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goto bad;
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}
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ti->num_flush_requests = 1;
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2011-08-02 13:32:05 +02:00
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ti->num_discard_requests = 1;
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2011-03-24 14:54:24 +01:00
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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 -EINVAL;
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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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2011-08-02 13:32:05 +02:00
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return fc->start + dm_target_offset(ti, bi_sector);
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2011-03-24 14:54:24 +01:00
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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_sector = flakey_map_sector(ti, bio->bi_sector);
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}
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2011-08-02 13:32:06 +02:00
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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_rw=%lu 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',
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bio->bi_rw, (unsigned long long)bio->bi_sector, bio_bytes);
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}
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}
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2011-03-24 14:54:24 +01:00
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static int flakey_map(struct dm_target *ti, struct bio *bio,
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union map_info *map_context)
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{
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struct flakey_c *fc = ti->private;
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unsigned elapsed;
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/* Are we alive ? */
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elapsed = (jiffies - fc->start_time) / HZ;
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2011-08-02 13:32:05 +02:00
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if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval) {
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2011-08-02 13:32:06 +02:00
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/*
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* Flag this bio as submitted while down.
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*/
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map_context->ll = 1;
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/*
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* Map reads as normal.
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*/
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if (bio_data_dir(bio) == READ)
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goto map_bio;
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2011-08-02 13:32:05 +02:00
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/*
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2011-08-02 13:32:06 +02:00
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* Drop writes?
|
2011-08-02 13:32:05 +02:00
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*/
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if (test_bit(DROP_WRITES, &fc->flags)) {
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2011-08-02 13:32:06 +02:00
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bio_endio(bio, 0);
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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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2011-08-02 13:32:05 +02:00
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goto map_bio;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2011-08-02 13:32:06 +02:00
|
|
|
* By default, error all I/O.
|
2011-08-02 13:32:05 +02:00
|
|
|
*/
|
2011-03-24 14:54:24 +01:00
|
|
|
return -EIO;
|
2011-08-02 13:32:05 +02:00
|
|
|
}
|
2011-03-24 14:54:24 +01:00
|
|
|
|
2011-08-02 13:32:05 +02:00
|
|
|
map_bio:
|
2011-03-24 14:54:24 +01:00
|
|
|
flakey_map_bio(ti, bio);
|
|
|
|
|
|
|
|
return DM_MAPIO_REMAPPED;
|
|
|
|
}
|
|
|
|
|
2011-08-02 13:32:06 +02:00
|
|
|
static int flakey_end_io(struct dm_target *ti, struct bio *bio,
|
|
|
|
int error, union map_info *map_context)
|
|
|
|
{
|
|
|
|
struct flakey_c *fc = ti->private;
|
|
|
|
unsigned bio_submitted_while_down = map_context->ll;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Corrupt successful READs while in down state.
|
|
|
|
* If flags were specified, only corrupt those that match.
|
|
|
|
*/
|
2012-03-07 20:09:39 +01:00
|
|
|
if (fc->corrupt_bio_byte && !error && bio_submitted_while_down &&
|
2011-08-02 13:32:06 +02:00
|
|
|
(bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&
|
|
|
|
all_corrupt_bio_flags_match(bio, fc))
|
|
|
|
corrupt_bio_data(bio, fc);
|
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2011-03-24 14:54:24 +01:00
|
|
|
static int flakey_status(struct dm_target *ti, status_type_t type,
|
2012-07-27 16:08:16 +02:00
|
|
|
unsigned status_flags, char *result, unsigned maxlen)
|
2011-03-24 14:54:24 +01:00
|
|
|
{
|
2011-08-02 13:32:05 +02:00
|
|
|
unsigned sz = 0;
|
2011-03-24 14:54:24 +01:00
|
|
|
struct flakey_c *fc = ti->private;
|
2011-08-02 13:32:05 +02:00
|
|
|
unsigned drop_writes;
|
2011-03-24 14:54:24 +01:00
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case STATUSTYPE_INFO:
|
|
|
|
result[0] = '\0';
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATUSTYPE_TABLE:
|
2011-08-02 13:32:05 +02:00
|
|
|
DMEMIT("%s %llu %u %u ", fc->dev->name,
|
|
|
|
(unsigned long long)fc->start, fc->up_interval,
|
|
|
|
fc->down_interval);
|
|
|
|
|
|
|
|
drop_writes = test_bit(DROP_WRITES, &fc->flags);
|
2011-08-02 13:32:06 +02:00
|
|
|
DMEMIT("%u ", drop_writes + (fc->corrupt_bio_byte > 0) * 5);
|
|
|
|
|
2011-08-02 13:32:05 +02:00
|
|
|
if (drop_writes)
|
|
|
|
DMEMIT("drop_writes ");
|
2011-08-02 13:32:06 +02:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2011-03-24 14:54:24 +01:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct flakey_c *fc = ti->private;
|
2012-01-12 16:01:29 +01:00
|
|
|
struct dm_dev *dev = fc->dev;
|
|
|
|
int r = 0;
|
2011-03-24 14:54:24 +01:00
|
|
|
|
2012-01-12 16:01:29 +01:00
|
|
|
/*
|
|
|
|
* Only pass ioctls through if the device sizes match exactly.
|
|
|
|
*/
|
|
|
|
if (fc->start ||
|
|
|
|
ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
|
|
|
|
r = scsi_verify_blk_ioctl(NULL, cmd);
|
|
|
|
|
|
|
|
return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
|
2011-03-24 14:54:24 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
|
|
|
|
struct bio_vec *biovec, int max_size)
|
|
|
|
{
|
|
|
|
struct flakey_c *fc = ti->private;
|
|
|
|
struct request_queue *q = bdev_get_queue(fc->dev->bdev);
|
|
|
|
|
|
|
|
if (!q->merge_bvec_fn)
|
|
|
|
return max_size;
|
|
|
|
|
|
|
|
bvm->bi_bdev = fc->dev->bdev;
|
|
|
|
bvm->bi_sector = flakey_map_sector(ti, bvm->bi_sector);
|
|
|
|
|
|
|
|
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
|
|
|
|
}
|
|
|
|
|
|
|
|
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",
|
2011-08-02 13:32:05 +02:00
|
|
|
.version = {1, 2, 0},
|
2011-03-24 14:54:24 +01:00
|
|
|
.module = THIS_MODULE,
|
|
|
|
.ctr = flakey_ctr,
|
|
|
|
.dtr = flakey_dtr,
|
|
|
|
.map = flakey_map,
|
2011-08-02 13:32:06 +02:00
|
|
|
.end_io = flakey_end_io,
|
2011-03-24 14:54:24 +01:00
|
|
|
.status = flakey_status,
|
|
|
|
.ioctl = flakey_ioctl,
|
|
|
|
.merge = flakey_merge,
|
|
|
|
.iterate_devices = flakey_iterate_devices,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init dm_flakey_init(void)
|
|
|
|
{
|
|
|
|
int r = dm_register_target(&flakey_target);
|
|
|
|
|
|
|
|
if (r < 0)
|
|
|
|
DMERR("register failed %d", r);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit dm_flakey_exit(void)
|
|
|
|
{
|
|
|
|
dm_unregister_target(&flakey_target);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Module hooks */
|
|
|
|
module_init(dm_flakey_init);
|
|
|
|
module_exit(dm_flakey_exit);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " flakey target");
|
|
|
|
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|