Merge tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs mount updates from Al Viro:
 "Several piles this cycle, this mount-related one being the largest and
  trickiest:

   - saner handling of guards in fs/namespace.c, getting rid of
     needlessly strong locking in some of the users

   - lock_mount() calling conventions change - have it set the
     environment for attaching to given location, storing the results in
     caller-supplied object, without altering the passed struct path.

     Make unlock_mount() called as __cleanup for those objects. It's not
     exactly guard(), but similar to it

   - MNT_WRITE_HOLD done right.

     mnt_hold_writers() does *not* mess with ->mnt_flags anymore, so
     insertion of a new mount into ->s_mounts of underlying superblock
     does not, in itself, expose ->mnt_flags of that mount to concurrent
     modifications

   - getting rid of pathological cases when umount() spends quadratic
     time removing the victims from propagation graph - part of that had
     been dealt with last cycle, this should finish it

   - a bunch of stuff constified

   - assorted cleanups

* tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (64 commits)
  constify {__,}mnt_is_readonly()
  WRITE_HOLD machinery: no need for to bump mount_lock seqcount
  struct mount: relocate MNT_WRITE_HOLD bit
  preparations to taking MNT_WRITE_HOLD out of ->mnt_flags
  setup_mnt(): primitive for connecting a mount to filesystem
  simplify the callers of mnt_unhold_writers()
  copy_mnt_ns(): use guards
  copy_mnt_ns(): use the regular mechanism for freeing empty mnt_ns on failure
  open_detached_copy(): separate creation of namespace into helper
  open_detached_copy(): don't bother with mount_lock_hash()
  path_has_submounts(): use guard(mount_locked_reader)
  fs/namespace.c: sanitize descriptions for {__,}lookup_mnt()
  ecryptfs: get rid of pointless mount references in ecryptfs dentries
  umount_tree(): take all victims out of propagation graph at once
  do_mount(): use __free(path_put)
  do_move_mount_old(): use __free(path_put)
  constify can_move_mount_beneath() arguments
  path_umount(): constify struct path argument
  may_copy_tree(), __do_loopback(): constify struct path argument
  path_mount(): constify struct path argument
  ...

1 files changed, 6 insertions, 6 deletions

diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 1605df0a171e..fda6beb041e0 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -680,7 +680,7 @@ void audit_trim_trees(void)
 		struct audit_tree *tree;
 		struct path path;
 		struct audit_node *node;
-		struct path *paths;
+		const struct path *paths;
 		struct path array[16];
 		int err;
 
@@ -703,7 +703,7 @@ void audit_trim_trees(void)
 			struct audit_chunk *chunk = find_chunk(node);
 			/* this could be NULL if the watch is dying else where... */
 			node->index |= 1U<<31;
-			for (struct path *p = paths; p->dentry; p++) {
+			for (const struct path *p = paths; p->dentry; p++) {
 				struct inode *inode = p->dentry->d_inode;
 				if (inode_to_key(inode) == chunk->key) {
 					node->index &= ~(1U<<31);
@@ -742,9 +742,9 @@ void audit_put_tree(struct audit_tree *tree)
 	put_tree(tree);
 }
 
-static int tag_mounts(struct path *paths, struct audit_tree *tree)
+static int tag_mounts(const struct path *paths, struct audit_tree *tree)
 {
-	for (struct path *p = paths; p->dentry; p++) {
+	for (const struct path *p = paths; p->dentry; p++) {
 		int err = tag_chunk(p->dentry->d_inode, tree);
 		if (err)
 			return err;
@@ -807,7 +807,7 @@ int audit_add_tree_rule(struct audit_krule *rule)
 	struct audit_tree *seed = rule->tree, *tree;
 	struct path path;
 	struct path array[16];
-	struct path *paths;
+	const struct path *paths;
 	int err;
 
 	rule->tree = NULL;
@@ -879,7 +879,7 @@ int audit_tag_tree(char *old, char *new)
 	int failed = 0;
 	struct path path1, path2;
 	struct path array[16];
-	struct path *paths;
+	const struct path *paths;
 	int err;
 
 	err = kern_path(new, 0, &path2);