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Illumos 6451 - ztest fails due to checksum errors 

6451 ztest fails due to checksum errors
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Jorgen Lundman <lundman@lundman.net>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/6451
  https://github.com/illumos/illumos-gate/commit/f9eb9fd

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Matthew Ahrens 2016-01-22 17:06:14 -08:00 committed by Brian Behlendorf
parent ba5ad9a48d
commit 91d888437f
1 changed files with 26 additions and 1 deletions
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27
cmd/ztest/ztest.c
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@ -4972,7 +4972,7 @@ ztest_fault_inject(ztest_ds_t *zd, uint64_t id)
char *path0;
char *pathrand;
size_t fsize;
int bshift = SPA_OLD_MAXBLOCKSHIFT + 2; /* don't scrog all labels */
int bshift = SPA_MAXBLOCKSHIFT + 2; /* don't scrog all labels */
int iters = 1000;
int maxfaults;
int mirror_save;
@ -5136,6 +5136,31 @@ ztest_fault_inject(ztest_ds_t *zd, uint64_t id)
fsize = lseek(fd, 0, SEEK_END);
while (--iters != 0) {
/*
* The offset must be chosen carefully to ensure that
* we do not inject a given logical block with errors
* on two different leaf devices, because ZFS can not
* tolerate that (if maxfaults==1).
*
* We divide each leaf into chunks of size
* (# leaves * SPA_MAXBLOCKSIZE * 4). Within each chunk
* there is a series of ranges to which we can inject errors.
* Each range can accept errors on only a single leaf vdev.
* The error injection ranges are separated by ranges
* which we will not inject errors on any device (DMZs).
* Each DMZ must be large enough such that a single block
* can not straddle it, so that a single block can not be
* a target in two different injection ranges (on different
* leaf vdevs).
*
* For example, with 3 leaves, each chunk looks like:
* 0 to 32M: injection range for leaf 0
* 32M to 64M: DMZ - no injection allowed
* 64M to 96M: injection range for leaf 1
* 96M to 128M: DMZ - no injection allowed
* 128M to 160M: injection range for leaf 2
* 160M to 192M: DMZ - no injection allowed
*/
offset = ztest_random(fsize / (leaves << bshift)) *
(leaves << bshift) + (leaf << bshift) +
(ztest_random(1ULL << (bshift - 1)) & -8ULL);