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has_locked_children(): use guards

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... and document the locking requirements of __has_locked_children()

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2025-08-20 21:48:35 -04:00
parent 511db073b2
commit f80b84358f
1 changed files with 3 additions and 6 deletions
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9
fs/namespace.c
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@@ -2373,6 +2373,7 @@ void dissolve_on_fput(struct vfsmount *mnt)
}
}
/* locks: namespace_shared && pinned(mnt) || mount_locked_reader */
static bool __has_locked_children(struct mount *mnt, struct dentry *dentry)
{
struct mount *child;
@@ -2389,12 +2390,8 @@ static bool __has_locked_children(struct mount *mnt, struct dentry *dentry)
bool has_locked_children(struct mount *mnt, struct dentry *dentry)
{
bool res;
read_seqlock_excl(&mount_lock);
res = __has_locked_children(mnt, dentry);
read_sequnlock_excl(&mount_lock);
return res;
guard(mount_locked_reader)();
return __has_locked_children(mnt, dentry);
}
/*