svn commit: r276913 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

Author: mav
Date: Sat Jan 10 18:28:58 2015
New Revision: 276913
URL: https://svnweb.freebsd.org/changeset/base/276913

Log:
  Use new optimized dmu_read_uio_dbuf() for ZVOLs in device mode.
  
  This slightly reduces overhead by avoiding dnode_hold()/dnode_rele() calls.
  
  MFC after:	2 weeks

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Sat Jan 10 16:55:28 2015	(r276912)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Sat Jan 10 18:28:58 2015	(r276913)
@@ -1818,7 +1818,7 @@ zvol_read(struct cdev *dev, struct uio *
 		if (bytes > volsize - uio->uio_loffset)
 			bytes = volsize - uio->uio_loffset;
 
-		error =  dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
+		error =  dmu_read_uio_dbuf(zv->zv_dbuf, uio, bytes);
 		if (error) {
 			/* convert checksum errors into IO errors */
 			if (error == ECKSUM)