X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fsuper.c;h=c96434ea71e25a78bd5bab4c446119e3fdb44d1a;hb=f73494dbd19d279723575a3b7432401635a9c49f;hp=954aeb80e202be0a40fc42eeca465c033ab1fc9a;hpb=37902bc190f1396a8c232783b29ddfcaa4026028;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/super.c b/fs/super.c
index 954aeb80e202..c96434ea71e2 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -415,6 +415,7 @@ void generic_shutdown_super(struct super_block *sb)
 		sb->s_flags &= ~MS_ACTIVE;
 
 		fsnotify_unmount_inodes(sb);
+		cgroup_writeback_umount();
 
 		evict_inodes(sb);
 
@@ -702,7 +703,8 @@ rescan:
 }
 
 /**
- *	do_remount_sb - asks filesystem to change mount options.
+ *	do_remount_sb2 - asks filesystem to change mount options.
+ *	@mnt:   mount we are looking at
  *	@sb:	superblock in question
  *	@flags:	numeric part of options
  *	@data:	the rest of options
@@ -710,7 +712,7 @@ rescan:
  *
  *	Alters the mount options of a mounted file system.
  */
-int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
+int do_remount_sb2(struct vfsmount *mnt, struct super_block *sb, int flags, void *data, int force)
 {
 	int retval;
 	int remount_ro;
@@ -752,7 +754,16 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
 		}
 	}
 
-	if (sb->s_op->remount_fs) {
+	if (mnt && sb->s_op->remount_fs2) {
+		retval = sb->s_op->remount_fs2(mnt, sb, &flags, data);
+		if (retval) {
+			if (!force)
+				goto cancel_readonly;
+			/* If forced remount, go ahead despite any errors */
+			WARN(1, "forced remount of a %s fs returned %i\n",
+			     sb->s_type->name, retval);
+		}
+	} else if (sb->s_op->remount_fs) {
 		retval = sb->s_op->remount_fs(sb, &flags, data);
 		if (retval) {
 			if (!force)
@@ -784,12 +795,17 @@ cancel_readonly:
 	return retval;
 }
 
+int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
+{
+	return do_remount_sb2(NULL, sb, flags, data, force);
+}
+
 static void do_emergency_remount(struct work_struct *work)
 {
 	struct super_block *sb, *p = NULL;
 
 	spin_lock(&sb_lock);
-	list_for_each_entry(sb, &super_blocks, s_list) {
+	list_for_each_entry_reverse(sb, &super_blocks, s_list) {
 		if (hlist_unhashed(&sb->s_instances))
 			continue;
 		sb->s_count++;
@@ -1103,7 +1119,7 @@ struct dentry *mount_single(struct file_system_type *fs_type,
 EXPORT_SYMBOL(mount_single);
 
 struct dentry *
-mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
+mount_fs(struct file_system_type *type, int flags, const char *name, struct vfsmount *mnt, void *data)
 {
 	struct dentry *root;
 	struct super_block *sb;
@@ -1120,7 +1136,10 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
 			goto out_free_secdata;
 	}
 
-	root = type->mount(type, flags, name, data);
+	if (type->mount2)
+		root = type->mount2(mnt, type, flags, name, data);
+	else
+		root = type->mount(type, flags, name, data);
 	if (IS_ERR(root)) {
 		error = PTR_ERR(root);
 		goto out_free_secdata;
@@ -1325,8 +1344,8 @@ int freeze_super(struct super_block *sb)
 		}
 	}
 	/*
-	 * This is just for debugging purposes so that fs can warn if it
-	 * sees write activity when frozen is set to SB_FREEZE_COMPLETE.
+	 * For debugging purposes so that fs can warn if it sees write activity
+	 * when frozen is set to SB_FREEZE_COMPLETE, and for thaw_super().
 	 */
 	sb->s_writers.frozen = SB_FREEZE_COMPLETE;
 	up_write(&sb->s_umount);
@@ -1345,7 +1364,7 @@ int thaw_super(struct super_block *sb)
 	int error;
 
 	down_write(&sb->s_umount);
-	if (sb->s_writers.frozen == SB_UNFROZEN) {
+	if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
 		up_write(&sb->s_umount);
 		return -EINVAL;
 	}