Merge branch 'aufs5.0/30stdalone' into aufs5.1/30stdalone

Documentation/filesystems/aufs/README

@@ -249,6 +249,13 @@ optional. When you meet some problems, they will help you.
   Supports a nested loopback mount in a branch-fs. This patch is
   unnecessary until aufs produces a message like "you may want to try
   another patch for loopback file".
+- proc_mounts.patch
+  When there are many mountpoints and many mount(2)/umount(2) are
+  running, then /proc/mounts may not show the all mountpoints.  This
+  patch makes /proc/mounts always show the full mountpoints list.
+  If you don't want to apply this patch and meet such problem, then you
+  need to increase the value of 'ProcMounts_Times' make-variable in
+  aufs-util.git as a second best solution.
 - vfs-ino.patch
   Modifies a system global kernel internal function get_next_ino() in
   order to stop assigning 0 for an inode-number. Not directly related to

fs/aufs/branch.h

@@ -225,7 +225,8 @@ int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs);
 static const loff_t au_loff_max = LLONG_MAX;
 
 aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry);
-struct file *au_xino_create(struct super_block *sb, char *fpath, int silent);
+struct file *au_xino_create(struct super_block *sb, char *fpath, int silent,
+			    int wbrtop);
 struct file *au_xino_create2(struct super_block *sb, struct path *base,
 			     struct file *copy_src);
 struct au_xi_new {

fs/aufs/loop.h

@@ -40,7 +40,7 @@ void au_warn_loopback(struct super_block *h_sb);
 int au_loopback_init(void);
 void au_loopback_fin(void);
 #else
-AuStub(struct file *, loop_backing_file, return NULL)
+AuStub(struct file *, loop_backing_file, return NULL, struct super_block *sb)
 
 AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
 	   struct dentry *h_adding)

fs/aufs/opts.c

@@ -918,7 +918,7 @@ static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
 	int err;
 	struct file *file;
 
-	file = au_xino_create(sb, args[0].from, /*silent*/0);
+	file = au_xino_create(sb, args[0].from, /*silent*/0, /*wbrtop*/0);
 	err = PTR_ERR(file);
 	if (IS_ERR(file))
 		goto out;

fs/aufs/xino.c

@@ -160,22 +160,28 @@ static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
 /*
  * create and set a new xino file
  */
-struct file *au_xino_create(struct super_block *sb, char *fpath, int silent)
+struct file *au_xino_create(struct super_block *sb, char *fpath, int silent,
+			    int wbrtop)
 {
 	struct file *file;
 	struct dentry *h_parent, *d;
 	struct inode *h_dir, *inode;
 	int err;
+	static DEFINE_MUTEX(mtx);
 
 	/*
 	 * at mount-time, and the xino file is the default path,
 	 * hnotify is disabled so we have no notify events to ignore.
 	 * when a user specified the xino, we cannot get au_hdir to be ignored.
 	 */
+	if (!wbrtop)
+		mutex_lock(&mtx);
 	file = vfsub_filp_open(fpath, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
 			       /* | __FMODE_NONOTIFY */,
 			       0666);
 	if (IS_ERR(file)) {
+		if (!wbrtop)
+			mutex_unlock(&mtx);
 		if (!silent)
 			pr_err("open %s(%ld)\n", fpath, PTR_ERR(file));
 		return file;
@@ -185,6 +191,8 @@ struct file *au_xino_create(struct super_block *sb, char *fpath, int silent)
 	err = 0;
 	d = file->f_path.dentry;
 	h_parent = au_dget_parent_lock(d, AuLsc_I_PARENT);
+	if (!wbrtop)
+		mutex_unlock(&mtx);
 	/* mnt_want_write() is unnecessary here */
 	h_dir = d_inode(h_parent);
 	inode = file_inode(file);
@@ -1667,11 +1675,12 @@ struct file *au_xino_def(struct super_block *sb)
 		if (!IS_ERR(p)) {
 			strcat(p, "/" AUFS_XINO_FNAME);
 			AuDbg("%s\n", p);
-			file = au_xino_create(sb, p, /*silent*/0);
+			file = au_xino_create(sb, p, /*silent*/0, /*wbrtop*/1);
 		}
 		free_page((unsigned long)page);
 	} else {
-		file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
+		file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0,
+				      /*wbrtop*/0);
 		if (IS_ERR(file))
 			goto out;
 		h_sb = file->f_path.dentry->d_sb;