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Add some fail points to gmirror.

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These are useful for testing changes to I/O error handling, and for
reproducing existing bugs in a controlled manner. The fail points are

    g_mirror_regular_request_read
    g_mirror_regular_request_write
    g_mirror_sync_request_read
    g_mirror_sync_request_write
    g_mirror_metadata_write

They all effectively allow one to inject an error value into the bio_error
field of a corresponding BIO request as it is being completed.

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Mark Johnston 2016-09-06 23:35:48 +00:00
parent b2fd098e58
commit 40c5032d32
1 changed files with 15 additions and 0 deletions
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15
sys/geom/mirror/g_mirror.c
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@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fail.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/limits.h>
@ -646,6 +647,7 @@ g_mirror_write_metadata(struct g_mirror_disk *disk,
else
mirror_metadata_encode(md, sector);
}
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error);
if (error == 0)
error = g_write_data(cp, offset, sector, length);
free(sector, M_MIRROR);
@ -914,6 +916,13 @@ g_mirror_regular_request(struct bio *bp)
g_topology_unlock();
}
if (bp->bio_cmd == BIO_READ)
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read,
bp->bio_error);
else if (bp->bio_cmd == BIO_WRITE)
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write,
bp->bio_error);
pbp->bio_inbed++;
KASSERT(pbp->bio_inbed <= pbp->bio_children,
("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
@ -1308,6 +1317,9 @@ g_mirror_sync_request(struct bio *bp)
{
struct g_consumer *cp;
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read,
bp->bio_error);
if (bp->bio_error != 0) {
G_MIRROR_LOGREQ(0, bp,
"Synchronization request failed (error=%d).",
@ -1334,6 +1346,9 @@ g_mirror_sync_request(struct bio *bp)
void *data;
int i;
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write,
bp->bio_error);
if (bp->bio_error != 0) {
G_MIRROR_LOGREQ(0, bp,
"Synchronization request failed (error=%d).",