Author: kib
Date: Wed Feb 29 15:18:53 2012
New Revision: 232305
URL: http://svn.freebsd.org/changeset/base/232305
Log:
Allow shared locks for reads when lower filesystem accept shared locking.
Tested by: pho
MFC after: 1 week
Modified:
head/sys/fs/nullfs/null_vfsops.c
Modified: head/sys/fs/nullfs/null_vfsops.c
==============================================================================
--- head/sys/fs/nullfs/null_vfsops.c Wed Feb 29 15:18:04 2012
(r232304)
+++ head/sys/fs/nullfs/null_vfsops.c Wed Feb 29 15:18:53 2012
(r232305)
@@ -185,7 +185,8 @@ nullfs_mount(struct mount *mp)
MNT_IUNLOCK(mp);
}
MNT_ILOCK(mp);
- mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE;
+ mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
+ (MNTK_MPSAFE | MNTK_SHARED_WRITES);
MNT_IUNLOCK(mp);
mp->mnt_data = xmp;
vfs_getnewfsid(mp);
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