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VFS: Clean up shared mount flag propagation

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The handling of mount flags in set_mnt_shared() got a little tangled
up during previous cleanups, with the following problems:

* MNT_PNODE_MASK is defined as a literal constant when it should be a
bitwise xor of other MNT_* flags
* set_mnt_shared() clears and then sets MNT_SHARED (part of MNT_PNODE_MASK)
* MNT_PNODE_MASK could use a comment in mount.h
* MNT_PNODE_MASK is a terrible name, change to MNT_SHARED_MASK

This patch fixes these problems.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Valerie Aurora 2010-01-26 14:20:47 -05:00 • committed by Al Viro
commit 495d6c9c65
3 changed files with 12 additions and 3 deletions
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2
fs/namespace.c
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@ -1538,7 +1538,7 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
err = do_remount_sb(sb, flags, data, 0);
if (!err) {
spin_lock(&vfsmount_lock);
mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
mnt_flags |= path->mnt->mnt_flags & MNT_PROPAGATION_MASK;
path->mnt->mnt_flags = mnt_flags;
spin_unlock(&vfsmount_lock);
}