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Commit cfbc0683 authored by NeilBrown's avatar NeilBrown Committed by Trond Myklebust
Browse files

NFS: ensure bdi_unregister is called on mount failure. 



bdi_unregister is called by nfs_put_super which is only called by
generic_shutdown_super if ->s_root is not NULL.  So if we error out
in a circumstance where we called nfs_bdi_register (i.e. server !=
NULL) but have not set s_root, then we need to call bdi_unregister
explicitly in nfs_get_sb and various other *_get_sb() functions.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent bb6fbc45

fs/nfs/super.c

+20 −5
Original line number Diff line number Diff line
@@ -2214,7 +2214,7 @@ static int nfs_get_sb(struct file_system_type *fs_type, 
	} else {

		error = nfs_bdi_register(server);

		if (error)

			goto error_splat_super;

			goto error_splat_bdi;

	}



	if (!s->s_root) {
@@ -2256,6 +2256,9 @@ static int nfs_get_sb(struct file_system_type *fs_type, 
error_splat_root:

	dput(mntroot);

error_splat_super:

	if (server && !s->s_root)

		bdi_unregister(&server->backing_dev_info);

error_splat_bdi:

	deactivate_locked_super(s);

	goto out;

}
@@ -2326,7 +2329,7 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 
	} else {

		error = nfs_bdi_register(server);

		if (error)

			goto error_splat_super;

			goto error_splat_bdi;

	}



	if (!s->s_root) {
@@ -2363,6 +2366,9 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 
	return error;



error_splat_super:

	if (server && !s->s_root)

		bdi_unregister(&server->backing_dev_info);

error_splat_bdi:

	deactivate_locked_super(s);

	dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);

	return error;
@@ -2578,7 +2584,7 @@ static int nfs4_remote_get_sb(struct file_system_type *fs_type, 
	} else {

		error = nfs_bdi_register(server);

		if (error)

			goto error_splat_super;

			goto error_splat_bdi;

	}



	if (!s->s_root) {
@@ -2616,6 +2622,9 @@ static int nfs4_remote_get_sb(struct file_system_type *fs_type, 
error_splat_root:

	dput(mntroot);

error_splat_super:

	if (server && !s->s_root)

		bdi_unregister(&server->backing_dev_info);

error_splat_bdi:

	deactivate_locked_super(s);

	goto out;

}
@@ -2811,7 +2820,7 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 
	} else {

		error = nfs_bdi_register(server);

		if (error)

			goto error_splat_super;

			goto error_splat_bdi;

	}



	if (!s->s_root) {
@@ -2847,6 +2856,9 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 
	return error;



error_splat_super:

	if (server && !s->s_root)

		bdi_unregister(&server->backing_dev_info);

error_splat_bdi:

	deactivate_locked_super(s);

	dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);

	return error;
@@ -2893,7 +2905,7 @@ static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 
	} else {

		error = nfs_bdi_register(server);

		if (error)

			goto error_splat_super;

			goto error_splat_bdi;

	}



	if (!s->s_root) {
@@ -2929,6 +2941,9 @@ static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 
	return error;



error_splat_super:

	if (server && !s->s_root)

		bdi_unregister(&server->backing_dev_info);

error_splat_bdi:

	deactivate_locked_super(s);

	dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);

	return error;