diff options
Diffstat (limited to 'sys/dev/md/md.c')
| -rw-r--r-- | sys/dev/md/md.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sys/dev/md/md.c b/sys/dev/md/md.c index 8ae51d134c17..99be494f330f 100644 --- a/sys/dev/md/md.c +++ b/sys/dev/md/md.c @@ -908,6 +908,22 @@ mdstart_swap(struct md_s *sc, struct bio *bp) return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); } +static int +mdstart_null(struct md_s *sc, struct bio *bp) +{ + + switch (bp->bio_cmd) { + case BIO_READ: + bzero(bp->bio_data, bp->bio_length); + cpu_flush_dcache(bp->bio_data, bp->bio_length); + break; + case BIO_WRITE: + break; + } + bp->bio_resid = 0; + return (0); +} + static void md_kthread(void *arg) { @@ -1027,6 +1043,7 @@ mdinit(struct md_s *sc) pp->flags |= G_PF_ACCEPT_UNMAPPED; break; case MD_PRELOAD: + case MD_NULL: break; } sc->gp = gp; @@ -1245,6 +1262,7 @@ mdresize(struct md_s *sc, struct md_ioctl *mdio) switch (sc->type) { case MD_VNODE: + case MD_NULL: break; case MD_SWAP: if (mdio->md_mediasize <= 0 || @@ -1339,6 +1357,19 @@ mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) return (error); } +static int +mdcreate_null(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) +{ + + /* + * Range check. Disallow negative sizes or any size less then the + * size of a page. Then round to a page. + */ + if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) + return (EDOM); + + return (0); +} static int xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) @@ -1371,6 +1402,7 @@ xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread case MD_PRELOAD: case MD_VNODE: case MD_SWAP: + case MD_NULL: break; default: return (EINVAL); @@ -1416,6 +1448,10 @@ xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread sc->start = mdstart_swap; error = mdcreate_swap(sc, mdio, td); break; + case MD_NULL: + sc->start = mdstart_null; + error = mdcreate_null(sc, mdio, td); + break; } if (error != 0) { mddestroy(sc, td); @@ -1586,6 +1622,9 @@ g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, case MD_SWAP: type = "swap"; break; + case MD_NULL: + type = "null"; + break; default: type = "unknown"; break; |