svn commit: r297083 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

Author: mav
Date: Sun Mar 20 20:31:30 2016
New Revision: 297083
URL: https://svnweb.freebsd.org/changeset/base/297083

Log:
  MFC r262990: MFV r262983:
  
  4638 Panic in ZFS via rfs3_setattr()/rfs3_write(): dirtying snapshot!
  
  illumos/illumos-gate at 2144b121c08e0eb676cc6ca4662ebbc9f9c22fe3

Modified:
  stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c	Sun Mar 20 20:27:52 2016	(r297082)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c	Sun Mar 20 20:31:30 2016	(r297083)
@@ -21,7 +21,7 @@
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
- * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
  */
 
 /* Portions Copyright 2007 Jeremy Teo */
@@ -894,6 +894,16 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
 	    &zp->z_pflags, 8);
 
 	/*
+	 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our
+	 * callers might not be able to detect properly that we are read-only,
+	 * so check it explicitly here.
+	 */
+	if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
+		ZFS_EXIT(zfsvfs);
+		return (SET_ERROR(EROFS));
+	}
+
+	/*
 	 * If immutable or not appending then return EPERM
 	 */
 	if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
@@ -5176,6 +5186,16 @@ zfs_space(vnode_t *vp, int cmd, flock64_
 		return (SET_ERROR(EINVAL));
 	}
 
+	/*
+	 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our
+	 * callers might not be able to detect properly that we are read-only,
+	 * so check it explicitly here.
+	 */
+	if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
+		ZFS_EXIT(zfsvfs);
+		return (SET_ERROR(EROFS));
+	}
+
 	if (error = convoff(vp, bfp, 0, offset)) {
 		ZFS_EXIT(zfsvfs);
 		return (error);