In vm_object_page_clean(), do not clean OBJ_MIGHTBEDIRTY object flag

if the filesystem performed short write and we are skipping the page
due to this.

Propogate write error from the pager back to the callers of
vm_pageout_flush().  Report the failure to write a page from the
requested range as the FALSE return value from vm_object_page_clean(),
and propagate it back to msync(2) to return EIO to usermode.

While there, convert the clearobjflags variable in the
vm_object_page_clean() and arguments of the helper functions to
boolean.

PR:	kern/165927
Reviewed by:	alc
MFC after:	2 weeks

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index 82bc846e0810..d9b151665ce3 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -508,6 +508,8 @@ sys_msync(td, uap)
 		return (EINVAL);	/* Sun returns ENOMEM? */
 	case KERN_INVALID_ARGUMENT:
 		return (EBUSY);
+	case KERN_FAILURE:
+		return (EIO);
 	default:
 		return (EINVAL);
 	}