Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull misc VFS updates from Al Viro:
 "This cycle a lot of stuff sits on topical branches, so I'll be sending
  more or less one pull request per branch.

  This is the first pile; more to follow in a few.  In this one are
  several misc commits from early in the cycle (before I went for
  separate branches), plus the rework of mntput/dput ordering on umount,
  switching to use of fs_pin instead of convoluted games in
  namespace_unlock()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  switch the IO-triggering parts of umount to fs_pin
  new fs_pin killing logics
  allow attaching fs_pin to a group not associated with some superblock
  get rid of the second argument of acct_kill()
  take count and rcu_head out of fs_pin
  dcache: let the dentry count go down to zero without taking d_lock
  pull bumping refcount into ->kill()
  kill pin_put()
  mode_t whack-a-mole: chelsio
  file->f_path.dentry is pinned down for as long as the file is open...
  get rid of lustre_dump_dentry()
  gut proc_register() a bit
  kill d_validate()
  ncpfs: get rid of d_validate() nonsense
  selinuxfs: don't open-code d_genocide()

2 files changed, 4 insertions, 54 deletions

diff --git a/security/commoncap.c b/security/commoncap.c
index 2915d8503054..f66713bd7450 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -434,7 +434,6 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
  */
 static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_cap)
 {
-        struct dentry *dentry;
         int rc = 0;
         struct cpu_vfs_cap_data vcaps;
 
@@ -446,9 +445,7 @@ static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_c
         if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
                 return 0;
 
-        dentry = dget(bprm->file->f_path.dentry);
-
-        rc = get_vfs_caps_from_disk(dentry, &vcaps);
+        rc = get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
         if (rc < 0) {
                 if (rc == -EINVAL)
                         printk(KERN_NOTICE "%s: get_vfs_caps_from_disk returned %d for %s\n",
@@ -464,7 +461,6 @@ static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_c
                        __func__, rc, bprm->filename);
 
 out:
-        dput(dentry);
         if (rc)
                 bprm_clear_caps(bprm);
 
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 33db1ad4fd10..1684bcc78b34 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1195,30 +1195,8 @@ static const struct file_operations sel_commit_bools_ops = {
 
 static void sel_remove_entries(struct dentry *de)
 {
-        struct list_head *node;
-
-        spin_lock(&de->d_lock);
-        node = de->d_subdirs.next;
-        while (node != &de->d_subdirs) {
-                struct dentry *d = list_entry(node, struct dentry, d_child);
-
-                spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
-                list_del_init(node);
-
-                if (d->d_inode) {
-                        dget_dlock(d);
-                        spin_unlock(&de->d_lock);
-                        spin_unlock(&d->d_lock);
-                        d_delete(d);
-                        simple_unlink(de->d_inode, d);
-                        dput(d);
-                        spin_lock(&de->d_lock);
-                } else
-                        spin_unlock(&d->d_lock);
-                node = de->d_subdirs.next;
-        }
-
-        spin_unlock(&de->d_lock);
+        d_genocide(de);
+        shrink_dcache_parent(de);
 }
 
 #define BOOL_DIR_NAME "booleans"
@@ -1668,37 +1646,13 @@ static int sel_make_class_dir_entries(char *classname, int index,
         return rc;
 }
 
-static void sel_remove_classes(void)
-{
-        struct list_head *class_node;
-
-        list_for_each(class_node, &class_dir->d_subdirs) {
-                struct dentry *class_subdir = list_entry(class_node,
-                                        struct dentry, d_child);
-                struct list_head *class_subdir_node;
-
-                list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
-                        struct dentry *d = list_entry(class_subdir_node,
-                                                struct dentry, d_child);
-
-                        if (d->d_inode)
-                                if (d->d_inode->i_mode & S_IFDIR)
-                                        sel_remove_entries(d);
-                }
-
-                sel_remove_entries(class_subdir);
-        }
-
-        sel_remove_entries(class_dir);
-}
-
 static int sel_make_classes(void)
 {
         int rc, nclasses, i;
         char **classes;
 
         /* delete any existing entries */
-        sel_remove_classes();
+        sel_remove_entries(class_dir);
 
         rc = security_get_classes(&classes, &nclasses);
         if (rc)