[src/trunk]: src/external/cddl/osnet/dist/uts/common/fs/zfs Add fstrans_start...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d5d249b56e8c
branches:  trunk
changeset: 452054:d5d249b56e8c
user:      hannken <hannken%NetBSD.org@localhost>
date:      Mon Jun 17 08:08:21 2019 +0000

description:
Add fstrans_start()/fstrans_done() and bounds check to zfs_netbsd_getpages().

diffstat:

 external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c |  14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diffs (42 lines):

diff -r cd1c49568262 -r d5d249b56e8c external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c
--- a/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c    Mon Jun 17 08:07:56 2019 +0000
+++ b/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c    Mon Jun 17 08:08:21 2019 +0000
@@ -5892,6 +5892,7 @@
        kmutex_t * const mtx = uobj->vmobjlock;
        znode_t *zp = VTOZ(vp);
        zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+       vfs_t *mp;
        struct vm_page *pg;
        caddr_t va;
        int npages, found, err = 0;
@@ -5910,10 +5911,22 @@
                return EBUSY;
        }
 
+       mp = vp->v_mount;
+       fstrans_start(mp);
+       if (vp->v_mount != mp) {
+               fstrans_done(mp);
+               return ENOENT;
+       }
        ZFS_ENTER(zfsvfs);
        ZFS_VERIFY_ZP(zp);
 
        mutex_enter(mtx);
+       if (offset >= vp->v_size) {
+               mutex_exit(mtx);
+               ZFS_EXIT(zfsvfs);
+               fstrans_done(mp);
+               return EINVAL;
+       }
        npages = 1;
        pg = NULL;
        uvn_findpages(uobj, offset, &npages, &pg, UFP_ALL);
@@ -5943,6 +5956,7 @@
        ap->a_m[ap->a_centeridx] = pg;
 
        ZFS_EXIT(zfsvfs);
+       fstrans_done(mp);
 
        return (err);
 }