Date: Tue, 8 Nov 2016 10:10:55 +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: r308442 - head/sys/kern Message-ID: <201611081010.uA8AAtqD041363@repo.freebsd.org>
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Author: kib Date: Tue Nov 8 10:10:55 2016 New Revision: 308442 URL: https://svnweb.freebsd.org/changeset/base/308442 Log: Tweaks for the buffer pager. Pass current thread credentials instead of NOCRED. Only allow unmapped buffers for filesystem which proclaimed the support. For all filesystems which currently use buffer pager (UFS, msdosfs and cd9660), the changes are effectively nop. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/kern/vfs_bio.c Modified: head/sys/kern/vfs_bio.c ============================================================================== --- head/sys/kern/vfs_bio.c Tue Nov 8 10:06:43 2016 (r308441) +++ head/sys/kern/vfs_bio.c Tue Nov 8 10:10:55 2016 (r308442) @@ -4686,13 +4686,15 @@ vfs_bio_getpages(struct vnode *vp, vm_pa vm_page_t m; vm_object_t object; struct buf *bp; + struct mount *mp; daddr_t lbn, lbnp; vm_ooffset_t la, lb, poff, poffe; long bsize; - int bo_bs, error, i; + int bo_bs, br_flags, error, i; bool redo, lpart; object = vp->v_object; + mp = vp->v_mount; la = IDX_TO_OFF(ma[count - 1]->pindex); if (la >= object->un_pager.vnp.vnp_size) return (VM_PAGER_BAD); @@ -4709,6 +4711,8 @@ vfs_bio_getpages(struct vnode *vp, vm_pa vnp.vnp_size, PAGE_SIZE) - la); } } + br_flags = (mp != NULL && (mp->mnt_kern_flag & MNTK_UNMAPPED_BUFS) + != 0) ? GB_UNMAPPED : 0; VM_OBJECT_WLOCK(object); again: for (i = 0; i < count; i++) @@ -4741,8 +4745,8 @@ again: lbnp = lbn; bsize = get_blksize(vp, lbn); - error = bread_gb(vp, lbn, bsize, NOCRED, GB_UNMAPPED, - &bp); + error = bread_gb(vp, lbn, bsize, curthread->td_ucred, + br_flags, &bp); if (error != 0) goto end_pages; if (LIST_EMPTY(&bp->b_dep)) {
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