Date: Fri, 4 Mar 2016 17:24:28 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r296388 - head/sys/fs/nullfs Message-ID: <201603041724.u24HOSUs058189@repo.freebsd.org>
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Author: kib Date: Fri Mar 4 17:24:28 2016 New Revision: 296388 URL: https://svnweb.freebsd.org/changeset/base/296388 Log: Pass MNTK_NO_IOPF and MNTK_UNMAPPED_BUFS flags from the lower filesystem to the nullfs mount. MNTK_NO_IOPF must be present on the nullfs struct mount so that struct file fo_read and fo_write fops operate in the mode requested by the lower mount. MNTK_UNMAPPED_BUFS allows VOP_GETPAGES() to use unmapped buffers. It does not matter for VOP_GETPAGES() calls from vm_fault() since handle of the vm_object always points to the lower vnode. But it may be useful for other situations where VOP_GETPAGES() is used. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Modified: head/sys/fs/nullfs/null_vfsops.c Modified: head/sys/fs/nullfs/null_vfsops.c ============================================================================== --- head/sys/fs/nullfs/null_vfsops.c Fri Mar 4 16:03:15 2016 (r296387) +++ head/sys/fs/nullfs/null_vfsops.c Fri Mar 4 17:24:28 2016 (r296388) @@ -199,7 +199,7 @@ nullfs_mount(struct mount *mp) } mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT; mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag & - MNTK_USES_BCACHE; + (MNTK_USES_BCACHE | MNTK_NO_IOPF | MNTK_UNMAPPED_BUFS); MNT_IUNLOCK(mp); mp->mnt_data = xmp; vfs_getnewfsid(mp);
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