diff options
Diffstat (limited to 'cmd')
| -rw-r--r-- | cmd/ztest/ztest.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c index 026fe5417..42643ef5d 100644 --- a/cmd/ztest/ztest.c +++ b/cmd/ztest/ztest.c @@ -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); |