While testing recent changes to opendir(), I noticed that fstatfs() does
not return the MNT_UNION flag for a -t nullfs -o union mount. As a
result, opendir()/readdir() return files that exist in both top and
bottom directories twice (at least . and ..). Other -o union mounts and
-t unionfs mounts work correctly in this regard.
The below patch passes through just the MNT_UNION flag of the nullfs
mount itself. Perhaps more flags should be passed through.
commit fce32a779af4eb977c9b96feb6e4f811d89f2881
Author: Jilles Tjoelker <jil...@stack.nl>
Date: Sat Feb 23 22:22:39 2013 +0100
nullfs: Preserve the MNT_UNION flag of the nullfs mount itself.
This is needed so that opendir() can properly detect a union mount like
mount -t nullfs -o union dir1 dir2.
diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c
index 3724e0a..ff06f57 100644
--- a/sys/fs/nullfs/null_vfsops.c
+++ b/sys/fs/nullfs/null_vfsops.c
@@ -313,7 +313,7 @@ nullfs_statfs(mp, sbp)
/* now copy across the "interesting" information and fake the rest */
sbp->f_type = mstat.f_type;
- sbp->f_flags = mstat.f_flags;
+ sbp->f_flags = (sbp->f_flags & MNT_UNION) | mstat.f_flags;
sbp->f_bsize = mstat.f_bsize;
sbp->f_iosize = mstat.f_iosize;
sbp->f_blocks = mstat.f_blocks;
--
Jilles Tjoelker
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