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__attach_mnt(): lose the second argument

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It's always ->mnt_parent of the first one.  What the function does is
making a mount (with already set parent and mountpoint) visible - in
mount hash and in the parent's list of children.

IOW, it takes the existing rootwards linkage and sets the matching
crownwards linkage.

Renamed to make_visible(), while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2025-06-17 21:10:02 -04:00
parent 9ed4b9eaea
commit 1a867d729f
1 changed files with 6 additions and 5 deletions
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11
fs/namespace.c
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@@ -1079,8 +1079,9 @@ void mnt_set_mountpoint(struct mount *mnt,
hlist_add_head(&child_mnt->mnt_mp_list, &mp->m_list);
}
static void __attach_mnt(struct mount *mnt, struct mount *parent)
static void make_visible(struct mount *mnt)
{
struct mount *parent = mnt->mnt_parent;
if (unlikely(mnt->mnt_mountpoint == parent->mnt.mnt_root))
parent->overmount = mnt;
hlist_add_head_rcu(&mnt->mnt_hash,
@@ -1098,7 +1099,7 @@ static void __attach_mnt(struct mount *mnt, struct mount *parent)
* Mount @mnt at @mp on @parent. Then attach @mnt
* to @parent's child mount list and to @mount_hashtable.
*
* Note, when __attach_mnt() is called @mnt->mnt_parent already points
* Note, when make_visible() is called @mnt->mnt_parent already points
* to the correct parent.
*
* Context: This function expects namespace_lock() and lock_mount_hash()
@@ -1108,7 +1109,7 @@ static void attach_mnt(struct mount *mnt, struct mount *parent,
struct mountpoint *mp)
{
mnt_set_mountpoint(parent, mp, mnt);
__attach_mnt(mnt, mnt->mnt_parent);
make_visible(mnt);
}
void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp, struct mount *mnt)
@@ -1182,7 +1183,7 @@ static void commit_tree(struct mount *mnt)
n->nr_mounts += n->pending_mounts;
n->pending_mounts = 0;
__attach_mnt(mnt, parent);
make_visible(mnt);
touch_mnt_namespace(n);
}
@@ -2679,7 +2680,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt);
if (beneath)
mnt_change_mountpoint(top, smp, top_mnt);
__attach_mnt(source_mnt, source_mnt->mnt_parent);
make_visible(source_mnt);
mnt_notify_add(source_mnt);
touch_mnt_namespace(source_mnt->mnt_ns);
} else {