svn commit: r272532 - stable/9/sys/fs/ext2fs

[Pedro F. Giffuni]

Author: pfg
Date: Sat Oct  4 17:49:36 2014
New Revision: 272532
URL: https://svnweb.freebsd.org/changeset/base/272532

Log:
  MFC	r271467, r271468:
  ext2fs: add ext2_getpages().
  
  Literally copy/pasted from ffs_getpages().
  
  Tested with:	fsx

Modified:
  stable/9/sys/fs/ext2fs/ext2_vnops.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/fs/   (props changed)

Modified: stable/9/sys/fs/ext2fs/ext2_vnops.c
==============================================================================
--- stable/9/sys/fs/ext2fs/ext2_vnops.c	Sat Oct  4 17:46:04 2014	(r272531)
+++ stable/9/sys/fs/ext2fs/ext2_vnops.c	Sat Oct  4 17:49:36 2014	(r272532)
@@ -54,6 +54,7 @@
 #include <sys/buf.h>
 #include <sys/endian.h>
 #include <sys/priv.h>
+#include <sys/rwlock.h>
 #include <sys/mount.h>
 #include <sys/unistd.h>
 #include <sys/time.h>
@@ -65,9 +66,11 @@
 #include <sys/file.h>
 
 #include <vm/vm.h>
-#include <vm/vm_page.h>
-#include <vm/vm_object.h>
+#include <vm/vm_param.h>
 #include <vm/vm_extern.h>
+#include <vm/vm_object.h>
+#include <vm/vm_page.h>
+#include <vm/vm_pager.h>
 #include <vm/vnode_pager.h>
 
 #include "opt_directio.h"
@@ -96,6 +99,7 @@ static int ext2_chown(struct vnode *, ui
 static vop_close_t	ext2_close;
 static vop_create_t	ext2_create;
 static vop_fsync_t	ext2_fsync;
+static vop_getpages_t	ext2_getpages;
 static vop_getattr_t	ext2_getattr;
 static vop_ioctl_t	ext2_ioctl;
 static vop_link_t	ext2_link;
@@ -126,6 +130,7 @@ struct vop_vector ext2_vnodeops = {
 	.vop_close =		ext2_close,
 	.vop_create =		ext2_create,
 	.vop_fsync =		ext2_fsync,
+	.vop_getpages =		ext2_getpages,
 	.vop_getattr =		ext2_getattr,
 	.vop_inactive =		ext2_inactive,
 	.vop_ioctl =		ext2_ioctl,
@@ -2067,3 +2072,43 @@ ext2_write(struct vop_write_args *ap)
 	}
 	return (error);
 }
+
+/*
+ * get page routine
+ */
+static int
+ext2_getpages(struct vop_getpages_args *ap)
+{
+	int i;
+	vm_page_t mreq;
+	int pcount;
+
+	pcount = round_page(ap->a_count) / PAGE_SIZE;
+	mreq = ap->a_m[ap->a_reqpage];
+
+	/*
+	 * if ANY DEV_BSIZE blocks are valid on a large filesystem block,
+	 * then the entire page is valid.  Since the page may be mapped,
+	 * user programs might reference data beyond the actual end of file
+	 * occuring within the page.  We have to zero that data.
+	 */
+	VM_OBJECT_WLOCK(mreq->object);
+	if (mreq->valid) {
+		if (mreq->valid != VM_PAGE_BITS_ALL)
+			vm_page_zero_invalid(mreq, TRUE);
+		for (i = 0; i < pcount; i++) {
+			if (i != ap->a_reqpage) {
+				vm_page_lock(ap->a_m[i]);
+				vm_page_free(ap->a_m[i]);
+				vm_page_unlock(ap->a_m[i]);
+			}
+		}
+		VM_OBJECT_WUNLOCK(mreq->object);
+		return VM_PAGER_OK;
+	}
+	VM_OBJECT_WUNLOCK(mreq->object);
+
+	return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
+					    ap->a_count,
+					    ap->a_reqpage);
+}