Call d_instantiate before unlocking inode

Under Linux a dentry referencing an inode must be instantiated before
the inode is unlocked.  To accomplish this without overly modifing
the core ZFS code the dentry it passed via the vattr_t.  There are
cases such as replay when a dentry is not available.  In which case
it is obviously not initialized at inode creation time, if a dentry
is needed it will be spliced as when required via d_lookup().

3 files changed, 12 insertions, 27 deletions

diff --git a/module/zfs/zfs_dir.c b/module/zfs/zfs_dir.c
index f54ed1912..355b0ef0a 100644
--- a/module/zfs/zfs_dir.c
+++ b/module/zfs/zfs_dir.c
@@ -774,10 +774,6 @@ zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
 	    8, 1, &value, tx);
 	ASSERT(error == 0);
 
-#ifdef HAVE_DNLC
-	dnlc_update(ZTOI(dzp), dl->dl_name, vp);
-#endif /* HAVE_DNLC */
-
 	return (0);
 }
 
diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c
index 1fe88499b..f9ea2a0eb 100644
--- a/module/zfs/zfs_znode.c
+++ b/module/zfs/zfs_znode.c
@@ -322,7 +322,8 @@ zfs_inode_set_ops(zfs_sb_t *zsb, struct inode *ip)
  */
 static znode_t *
 zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz,
-    dmu_object_type_t obj_type, uint64_t obj, sa_handle_t *hdl)
+    dmu_object_type_t obj_type, uint64_t obj, sa_handle_t *hdl,
+    struct dentry *dentry)
 {
 	znode_t	*zp;
 	struct inode *ip;
@@ -379,6 +380,9 @@ zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz,
 	if (insert_inode_locked(ip))
 		goto error;
 
+	if (dentry)
+		d_instantiate(dentry, ip);
+
 	mutex_enter(&zsb->z_znodes_lock);
 	list_insert_tail(&zsb->z_all_znodes, zp);
 	membar_producer();
@@ -675,7 +679,8 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
 	VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
 
 	if (!(flag & IS_ROOT_NODE)) {
-		*zpp = zfs_znode_alloc(zsb, db, 0, obj_type, obj, sa_hdl);
+		*zpp = zfs_znode_alloc(zsb, db, 0, obj_type, obj, sa_hdl,
+		    vap->va_dentry);
 		ASSERT(*zpp != NULL);
 		ASSERT(dzp != NULL);
 		err = zpl_xattr_security_init(ZTOI(*zpp), ZTOI(dzp));
@@ -866,7 +871,7 @@ zfs_zget(zfs_sb_t *zsb, uint64_t obj_num, znode_t **zpp)
 	 * bonus buffer.
 	 */
 	zp = zfs_znode_alloc(zsb, db, doi.doi_data_block_size,
-	    doi.doi_bonus_type, obj_num, NULL);
+	    doi.doi_bonus_type, obj_num, NULL, NULL);
 	if (zp == NULL) {
 		err = ENOENT;
 	} else {
diff --git a/module/zfs/zpl_inode.c b/module/zfs/zpl_inode.c
index fcc19b004..029a4038b 100644
--- a/module/zfs/zpl_inode.c
+++ b/module/zfs/zpl_inode.c
@@ -66,14 +66,10 @@ zpl_create(struct inode *dir, struct dentry *dentry, int mode,
 	vap->va_mask = ATTR_MODE;
 	vap->va_uid = crgetfsuid(cr);
 	vap->va_gid = crgetfsgid(cr);
+	vap->va_dentry = dentry;
 
 	error = -zfs_create(dir, (char *)dentry->d_name.name,
 	    vap, 0, mode, &ip, cr, 0, NULL);
-	if (error)
-		goto out;
-
-	d_instantiate(dentry, ip);
-out:
 	kmem_free(vap, sizeof(vattr_t));
 	crfree(cr);
 	ASSERT3S(error, <=, 0);
@@ -96,14 +92,10 @@ zpl_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 	vap->va_rdev = rdev;
 	vap->va_uid = crgetfsuid(cr);
 	vap->va_gid = crgetfsgid(cr);
+	vap->va_dentry = dentry;
 
 	error = -zfs_create(dir, (char *)dentry->d_name.name,
 	    vap, 0, mode, &ip, cr, 0, NULL);
-	if (error)
-		goto out;
-
-	d_instantiate(dentry, ip);
-out:
 	kmem_free(vap, sizeof(vattr_t));
 	crfree(cr);
 	ASSERT3S(error, <=, 0);
@@ -139,13 +131,9 @@ zpl_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	vap->va_mask = ATTR_MODE;
 	vap->va_uid = crgetfsuid(cr);
 	vap->va_gid = crgetfsgid(cr);
+	vap->va_dentry = dentry;
 
 	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
-	if (error)
-		goto out;
-
-	d_instantiate(dentry, ip);
-out:
 	kmem_free(vap, sizeof(vattr_t));
 	crfree(cr);
 	ASSERT3S(error, <=, 0);
@@ -264,13 +252,9 @@ zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
 	vap->va_mask = ATTR_MODE;
 	vap->va_uid = crgetfsuid(cr);
 	vap->va_gid = crgetfsgid(cr);
+	vap->va_dentry = dentry;
 
 	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
-	if (error)
-		goto out;
-
-	d_instantiate(dentry, ip);
-out:
 	kmem_free(vap, sizeof(vattr_t));
 	crfree(cr);
 	ASSERT3S(error, <=, 0);