Date: Tue, 03 Sep 2019 14:07:41 -0000 From: Kirk McKusick <mckusick@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r346222 - stable/11/sys/dev/md Message-ID: <201904151209.x3FC9wxo099632@repo.freebsd.org>
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Author: mckusick Date: Mon Apr 15 12:09:58 2019 New Revision: 346222 URL: https://svnweb.freebsd.org/changeset/base/346222 Log: MFC of 345758 Properly flush outstanding I/Os when forcibly deleteing a memory disk device. Sponsored by: Netflix Modified: stable/11/sys/dev/md/md.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/md/md.c ============================================================================== --- stable/11/sys/dev/md/md.c Mon Apr 15 12:07:41 2019 (r346221) +++ stable/11/sys/dev/md/md.c Mon Apr 15 12:09:58 2019 (r346222) @@ -106,6 +106,7 @@ #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ #define MD_EXITING 0x20000 /* Worker thread is exiting. */ +#define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ #ifndef MD_NSECT #define MD_NSECT (10000 * 2) @@ -152,6 +153,7 @@ static g_start_t g_md_start; static g_access_t g_md_access; static void g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); +static g_provgone_t g_md_providergone; static struct cdev *status_dev = NULL; static struct sx md_sx; @@ -173,6 +175,7 @@ struct g_class g_md_class = { .start = g_md_start, .access = g_md_access, .dumpconf = g_md_dumpconf, + .providergone = g_md_providergone, }; DECLARE_GEOM_CLASS(g_md_class, g_md); @@ -432,8 +435,8 @@ g_md_start(struct bio *bp) } mtx_lock(&sc->queue_mtx); bioq_disksort(&sc->bio_queue, bp); - mtx_unlock(&sc->queue_mtx); wakeup(sc); + mtx_unlock(&sc->queue_mtx); } #define MD_MALLOC_MOVE_ZERO 1 @@ -1421,17 +1424,30 @@ bad: return (error); } +static void +g_md_providergone(struct g_provider *pp) +{ + struct md_s *sc = pp->geom->softc; + + mtx_lock(&sc->queue_mtx); + sc->flags |= MD_PROVIDERGONE; + wakeup(&sc->flags); + mtx_unlock(&sc->queue_mtx); +} + static int mddestroy(struct md_s *sc, struct thread *td) { if (sc->gp) { - sc->gp->softc = NULL; g_topology_lock(); g_wither_geom(sc->gp, ENXIO); g_topology_unlock(); - sc->gp = NULL; - sc->pp = NULL; + + mtx_lock(&sc->queue_mtx); + while (!(sc->flags & MD_PROVIDERGONE)) + msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); + mtx_unlock(&sc->queue_mtx); } if (sc->devstat) { devstat_remove_entry(sc->devstat);
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