X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fsuper.c;h=3e7458c2bb76c6d46b44a57718cb3b30a9d317fe;hb=366d6aef281a670b32a51d289fc07bf0e5e72d9a;hp=aec99ddbe53f726a526d4cd0b02abb9f55179e0b;hpb=9361401eb7619c033e2394e4f9f6d410d6719ac7;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/super.c b/fs/super.c
index aec99dd..3e7458c 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -221,6 +221,24 @@ static int grab_super(struct super_block *s) __releases(sb_lock)
 }
 
 /*
+ * Superblock locking.  We really ought to get rid of these two.
+ */
+void lock_super(struct super_block * sb)
+{
+	get_fs_excl();
+	mutex_lock(&sb->s_lock);
+}
+
+void unlock_super(struct super_block * sb)
+{
+	put_fs_excl();
+	mutex_unlock(&sb->s_lock);
+}
+
+EXPORT_SYMBOL(lock_super);
+EXPORT_SYMBOL(unlock_super);
+
+/*
  * Write out and wait upon all dirty data associated with this
  * superblock.  Filesystem data as well as the underlying block
  * device.  Takes the superblock lock.  Requires a second blkdev
@@ -260,17 +278,17 @@ int fsync_super(struct super_block *sb)
  *	that need destruction out of superblock, call generic_shutdown_super()
  *	and release aforementioned objects.  Note: dentries and inodes _are_
  *	taken care of and do not need specific handling.
+ *
+ *	Upon calling this function, the filesystem may no longer alter or
+ *	rearrange the set of dentries belonging to this super_block, nor may it
+ *	change the attachments of dentries to inodes.
  */
 void generic_shutdown_super(struct super_block *sb)
 {
-	struct dentry *root = sb->s_root;
 	struct super_operations *sop = sb->s_op;
 
-	if (root) {
-		sb->s_root = NULL;
-		shrink_dcache_parent(root);
-		shrink_dcache_sb(sb);
-		dput(root);
+	if (sb->s_root) {
+		shrink_dcache_for_umount(sb);
 		fsync_super(sb);
 		lock_super(sb);
 		sb->s_flags &= ~MS_ACTIVE;
@@ -552,7 +570,7 @@ static void mark_files_ro(struct super_block *sb)
 
 	file_list_lock();
 	list_for_each_entry(f, &sb->s_files, f_u.fu_list) {
-		if (S_ISREG(f->f_dentry->d_inode->i_mode) && file_count(f))
+		if (S_ISREG(f->f_path.dentry->d_inode->i_mode) && file_count(f))
 			f->f_mode &= ~FMODE_WRITE;
 	}
 	file_list_unlock();
@@ -735,9 +753,9 @@ int get_sb_bdev(struct file_system_type *fs_type,
 	 * will protect the lockfs code from trying to start a snapshot
 	 * while we are mounting
 	 */
-	mutex_lock(&bdev->bd_mount_mutex);
+	down(&bdev->bd_mount_sem);
 	s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-	mutex_unlock(&bdev->bd_mount_mutex);
+	up(&bdev->bd_mount_sem);
 	if (IS_ERR(s))
 		goto error_s;