Enable zfs_znode compilation

Basic compilation of the bulk of zfs_znode.c has been enabled.  After
much consideration it was decided to convert the existing vnode based
interfaces to more friendly Linux interfaces.  The following commits
will systematically replace update the requiter interfaces.  There
are of course pros and cons to this decision.

Pros:
* This simplifies intergration with Linux in the long term.  There is
  no longer any need to manage vnodes which are a foreign concept to
  the Linux VFS.
* Improved long term maintainability.
* Minor performance improvements by removing vnode overhead.

Cons:
* Added work in the short term to modify multiple ZFS interfaces.
* Harder to pull in changes if we ever see any new code from Solaris.
* Mixed Solaris and Linux interfaces in some ZFS code.

2 files changed, 21 insertions, 18 deletions

diff --git a/module/zfs/sa.c b/module/zfs/sa.c
index ee1140ffb..c90008252 100644
--- a/module/zfs/sa.c
+++ b/module/zfs/sa.c
@@ -1436,7 +1436,6 @@ sa_lookup(sa_handle_t *hdl, sa_attr_type_t attr, void *buf, uint32_t buflen)
 int
 sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
 {
-#ifdef HAVE_ZPL
 	int error;
 	sa_bulk_attr_t bulk;
 
@@ -1453,9 +1452,6 @@ sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
 	}
 	mutex_exit(&hdl->sa_lock);
 	return (error);
-#else
-	return ENOSYS;
-#endif /* HAVE_ZPL */
 }
 #endif
 
diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c
index 137a06810..72a077d08 100644
--- a/module/zfs/zfs_znode.c
+++ b/module/zfs/zfs_znode.c
@@ -88,7 +88,6 @@
  * (such as VFS logic) that will not compile easily in userland.
  */
 #ifdef _KERNEL
-#ifdef HAVE_ZPL
 /*
  * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to
  * be freed before it can be safely accessed.
@@ -98,17 +97,6 @@ krwlock_t zfsvfs_lock;
 static kmem_cache_t *znode_cache = NULL;
 
 /*ARGSUSED*/
-static void
-znode_evict_error(dmu_buf_t *dbuf, void *user_ptr)
-{
-	/*
-	 * We should never drop all dbuf refs without first clearing
-	 * the eviction callback.
-	 */
-	panic("evicting znode %p\n", user_ptr);
-}
-
-/*ARGSUSED*/
 static int
 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
 {
@@ -179,7 +167,9 @@ zfs_znode_fini(void)
 	/*
 	 * Cleanup vfs & vnode ops
 	 */
+#ifdef HAVE_ZPL
 	zfs_remove_op_tables();
+#endif /* HAVE_ZPL */
 
 	/*
 	 * Cleanup zcache
@@ -190,6 +180,7 @@ zfs_znode_fini(void)
 	rw_destroy(&zfsvfs_lock);
 }
 
+#ifdef HAVE_ZPL
 struct vnodeops *zfs_dvnodeops;
 struct vnodeops *zfs_fvnodeops;
 struct vnodeops *zfs_symvnodeops;
@@ -346,6 +337,8 @@ zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
 #define	MAXMIN64	0xffffffffUL
 #endif
 
+#endif /* HAVE_ZPL */
+
 /*
  * Create special expldev for ZFS private use.
  * Can't use standard expldev since it doesn't do
@@ -443,11 +436,13 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
     dmu_object_type_t obj_type, sa_handle_t *hdl)
 {
 	znode_t	*zp;
+#ifdef HAVE_ZPL
 	vnode_t *vp;
 	uint64_t mode;
 	uint64_t parent;
 	sa_bulk_attr_t bulk[9];
 	int count = 0;
+#endif /* HAVE_ZPL */
 
 	zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
 
@@ -468,6 +463,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 	zp->z_seq = 0x7A4653;
 	zp->z_sync_cnt = 0;
 
+#ifdef HAVE_ZPL
 	vp = ZTOV(zp);
 	vn_reinit(vp);
 
@@ -542,7 +538,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 		vn_setops(vp, zfs_evnodeops);
 		break;
 	}
-
+#endif /* HAVE_ZPL */
 	mutex_enter(&zfsvfs->z_znodes_lock);
 	list_insert_tail(&zfsvfs->z_all_znodes, zp);
 	membar_producer();
@@ -835,6 +831,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
 void
 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
 {
+#ifdef HAVE_XVATTR
 	xoptattr_t *xoap;
 
 	xoap = xva_getxoptattr(xvap);
@@ -921,6 +918,7 @@ zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
 		    zp->z_pflags, tx);
 		XVA_SET_RTN(xvap, XAT_SPARSE);
 	}
+#endif /* HAVE_XVATTR */
 }
 
 int
@@ -1249,6 +1247,7 @@ zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
 	dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
 }
 
+#ifdef HAVE_ZPL
 /*
  * This is a dummy interface used when pvn_vplist_dirty() should *not*
  * be calling back into the fs for a putpage().  E.g.: when truncating
@@ -1262,6 +1261,7 @@ zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
 	ASSERT(0);
 	return (0);
 }
+#endif /* HAVE_ZPL */
 
 /*
  * Increase the file length
@@ -1393,7 +1393,9 @@ static int
 zfs_trunc(znode_t *zp, uint64_t end)
 {
 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+#ifdef HAVE_ZPL
 	vnode_t *vp = ZTOV(zp);
+#endif /* HAVE_ZPL */
 	dmu_tx_t *tx;
 	rl_t *rl;
 	int error;
@@ -1447,6 +1449,7 @@ top:
 
 	dmu_tx_commit(tx);
 
+#ifdef HAVE_ZPL
 	/*
 	 * Clear any mapped pages in the truncated region.  This has to
 	 * happen outside of the transaction to avoid the possibility of
@@ -1470,6 +1473,7 @@ top:
 		    B_INVAL | B_TRUNC, NULL);
 		ASSERT(error == 0);
 	}
+#endif /* HAVE_ZPL */
 
 	zfs_range_unlock(rl);
 
@@ -1491,7 +1495,9 @@ top:
 int
 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
 {
+#ifdef HAVE_ZPL
 	vnode_t *vp = ZTOV(zp);
+#endif /* HAVE_ZPL */
 	dmu_tx_t *tx;
 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
 	zilog_t *zilog = zfsvfs->z_log;
@@ -1513,6 +1519,7 @@ zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
 			return (error);
 	}
 
+#ifdef HAVE_ZPL
 	/*
 	 * Check for any locks in the region to be freed.
 	 */
@@ -1522,6 +1529,7 @@ zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
 		if (error = chklock(vp, FWRITE, off, length, flag, NULL))
 			return (error);
 	}
+#endif /* HAVE_ZPL */
 
 	if (len == 0) {
 		error = zfs_trunc(zp, off);
@@ -1560,7 +1568,6 @@ log:
 	dmu_tx_commit(tx);
 	return (0);
 }
-#endif /* HAVE_ZPL */
 
 void
 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)