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Simplify synchronization read error handling.

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Since synchronization reads are performed by submitting a request to
the external mirror provider, we know that the request returns with an
error only when gmirror was unable to read a copy of the block from any
mirror. Thus, there is no need to retry the request from the
synchronization error handler.

Tested by:	pho
MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
This commit is contained in:
markj 2018-02-06 16:02:33 +00:00
parent cd7d6f40a6
commit 1899f7330d
1 changed files with 7 additions and 24 deletions
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31
sys/geom/mirror/g_mirror.c
View File

@ -1336,9 +1336,7 @@ g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp)
*/
switch (bp->bio_cmd) {
case BIO_READ: {
struct g_mirror_disk *d;
struct g_consumer *cp;
int readable;
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read,
bp->bio_error);
@ -1348,32 +1346,18 @@ g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp)
"Synchronization request failed (error=%d).",
bp->bio_error);
/*
* If there's at least one other disk from which we can
* read the block, retry the request.
*/
readable = 0;
LIST_FOREACH(d, &sc->sc_disks, d_next)
if (d->d_state == G_MIRROR_DISK_STATE_ACTIVE &&
!(d->d_flags & G_MIRROR_DISK_FLAG_BROKEN))
readable++;
/*
* The read error will trigger a syncid bump, so there's
* no need to do that here.
*
* If we can retry the read from another disk, do so.
* Otherwise, all we can do is kick out the new disk.
* The read error handling for regular requests will
* retry the read from all active mirrors before passing
* the error back up, so there's no need to retry here.
*/
if (readable == 0) {
g_mirror_sync_request_free(disk, bp);
g_mirror_event_send(disk,
G_MIRROR_DISK_STATE_DISCONNECTED,
G_MIRROR_EVENT_DONTWAIT);
} else {
g_mirror_sync_reinit(disk, bp, bp->bio_offset);
goto retry_read;
}
g_mirror_sync_request_free(disk, bp);
g_mirror_event_send(disk,
G_MIRROR_DISK_STATE_DISCONNECTED,
G_MIRROR_EVENT_DONTWAIT);
return;
}
G_MIRROR_LOGREQ(3, bp,
@ -1429,7 +1413,6 @@ g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp)
g_mirror_sync_reinit(disk, bp, sync->ds_offset);
sync->ds_offset += bp->bio_length;
retry_read:
G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
sync->ds_consumer->index++;