diff options
Diffstat (limited to 'usr/src/uts/common/os/streamio.c')
| -rw-r--r-- | usr/src/uts/common/os/streamio.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/usr/src/uts/common/os/streamio.c b/usr/src/uts/common/os/streamio.c index 21ec25b5b3..8ec67ea76a 100644 --- a/usr/src/uts/common/os/streamio.c +++ b/usr/src/uts/common/os/streamio.c @@ -25,6 +25,7 @@ /* * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2017 Joyent, Inc. + * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. */ #include <sys/types.h> @@ -3821,6 +3822,30 @@ strioctl(struct vnode *vp, int cmd, intptr_t arg, int flag, int copyflag, TRACE_2(TR_FAC_STREAMS_FR, TR_I_PUSH, "I_PUSH:fp %p stp %p", fp, stp); + /* + * If the module is flagged as single-instance, then check + * to see if the module is already pushed. If it is, return + * as if the push was successful. + */ + if (fp->f_qflag & _QSINGLE_INSTANCE) { + queue_t *q; + + claimstr(stp->sd_wrq); + for (q = stp->sd_wrq->q_next; q; q = q->q_next) { + if (q->q_flag & QREADR) { + q = NULL; + break; + } + if (strcmp(mname, Q2NAME(q)) == 0) + break; + } + releasestr(stp->sd_wrq); + if (q != NULL) { + fmodsw_rele(fp); + return (0); + } + } + if (error = strstartplumb(stp, flag, cmd)) { fmodsw_rele(fp); return (error); |