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Add corruption failure option to zinject(8)

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Added a 'corrupt' error option that will flip a bit in the data
after a read operation.  This is useful for generating checksum
errors at the device layer (in a mirror config for example). It
is also used to validate the diagnosis of checksum errors from
the zfs diagnosis engine.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Don Brady <don.brady@intel.com>
Closes #6345
This commit is contained in:
Don Brady
2017-08-14 18:17:15 -04:00
committed by Brian Behlendorf
parent 42a76fc8d7
commit d977122da9
5 changed files with 76 additions and 17 deletions
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cmd/zinject/zinject.c
+24 -10
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@@ -36,12 +36,15 @@
*
* Errors can be injected into a particular vdev using the '-d' option. This
* option takes a path or vdev GUID to uniquely identify the device within a
* pool. There are two types of errors that can be injected, EIO and ENXIO,
* that can be controlled through the '-e' option. The default is ENXIO. For
* EIO failures, any attempt to read data from the device will return EIO, but
* subsequent attempt to reopen the device will succeed. For ENXIO failures,
* any attempt to read from the device will return EIO, but any attempt to
* reopen the device will also return ENXIO.
* pool. There are four types of errors that can be injected, IO, ENXIO,
* ECHILD, and EILSEQ. These can be controlled through the '-e' option and the
* default is ENXIO. For EIO failures, any attempt to read data from the device
* will return EIO, but a subsequent attempt to reopen the device will succeed.
* For ENXIO failures, any attempt to read from the device will return EIO, but
* any attempt to reopen the device will also return ENXIO. The EILSEQ failures
* only apply to read operations (-T read) and will flip a bit after the device
* has read the original data.
*
* For label faults, the -L option must be specified. This allows faults
* to be injected into either the nvlist, uberblock, pad1, or pad2 region
* of all the labels for the specified device.
@@ -231,11 +234,12 @@ usage(void)
"\t\tspa_vdev_exit() will trigger a panic.\n"
"\n"
"\tzinject -d device [-e errno] [-L <nvlist|uber|pad1|pad2>] [-F]\n"
"\t [-T <read|write|free|claim|all>] [-f frequency] pool\n"
"\t\t[-T <read|write|free|claim|all>] [-f frequency] pool\n\n"
"\t\tInject a fault into a particular device or the device's\n"
"\t\tlabel. Label injection can either be 'nvlist', 'uber',\n "
"\t\t'pad1', or 'pad2'.\n"
"\t\t'errno' can be 'nxio' (the default), 'io', or 'dtl'.\n"
"\t\t'errno' can be 'nxio' (the default), 'io', 'dtl', or\n"
"\t\t'corrupt' (bit flip).\n"
"\t\t'frequency' is a value between 0.0001 and 100.0 that limits\n"
"\t\tdevice error injection to a percentage of the IOs.\n"
"\n"
@@ -774,6 +778,8 @@ main(int argc, char **argv)
error = ENXIO;
} else if (strcasecmp(optarg, "dtl") == 0) {
error = ECHILD;
} else if (strcasecmp(optarg, "corrupt") == 0) {
error = EILSEQ;
} else {
(void) fprintf(stderr, "invalid error type "
"'%s': must be 'io', 'checksum' or "
@@ -981,7 +987,15 @@ main(int argc, char **argv)
if (error == ECKSUM) {
(void) fprintf(stderr, "device error type must be "
"'io' or 'nxio'\n");
"'io', 'nxio' or 'corrupt'\n");
libzfs_fini(g_zfs);
return (1);
}
if (error == EILSEQ &&
(record.zi_freq == 0 || io_type != ZIO_TYPE_READ)) {
(void) fprintf(stderr, "device corrupt errors require "
"io type read and a frequency value\n");
libzfs_fini(g_zfs);
return (1);
}
@@ -1109,7 +1123,7 @@ main(int argc, char **argv)
return (2);
}
if (error == ENXIO) {
if (error == ENXIO || error == EILSEQ) {
(void) fprintf(stderr, "data error type must be "
"'checksum' or 'io'\n");
libzfs_fini(g_zfs);