Commit 6f06d96f authored by Sascha Hauer's avatar Sascha Hauer Committed by Richard Weinberger
Browse files

ubifs: Add auth nodes to garbage collector journal head 



To be able to authenticate the garbage collector journal head add
authentication nodes to the buds the garbage collector creates.

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 6a98bc46

fs/ubifs/gc.c

+43 −3
Original line number Diff line number Diff line
@@ -365,12 +365,13 @@ static int move_nodes(struct ubifs_info *c, struct ubifs_scan_leb *sleb) 


	/* Write nodes to their new location. Use the first-fit strategy */

	while (1) {

		int avail;

		int avail, moved = 0;

		struct ubifs_scan_node *snod, *tmp;



		/* Move data nodes */

		list_for_each_entry_safe(snod, tmp, &sleb->nodes, list) {

			avail = c->leb_size - wbuf->offs - wbuf->used;

			avail = c->leb_size - wbuf->offs - wbuf->used -

					ubifs_auth_node_sz(c);

			if  (snod->len > avail)

				/*

				 * Do not skip data nodes in order to optimize
@@ -378,14 +379,21 @@ static int move_nodes(struct ubifs_info *c, struct ubifs_scan_leb *sleb) 
				 */

				break;



			err = ubifs_shash_update(c, c->jheads[GCHD].log_hash,

						 snod->node, snod->len);

			if (err)

				goto out;



			err = move_node(c, sleb, snod, wbuf);

			if (err)

				goto out;

			moved = 1;

		}



		/* Move non-data nodes */

		list_for_each_entry_safe(snod, tmp, &nondata, list) {

			avail = c->leb_size - wbuf->offs - wbuf->used;

			avail = c->leb_size - wbuf->offs - wbuf->used -

					ubifs_auth_node_sz(c);

			if (avail < min)

				break;
@@ -403,9 +411,41 @@ static int move_nodes(struct ubifs_info *c, struct ubifs_scan_leb *sleb) 
				continue;

			}



			err = ubifs_shash_update(c, c->jheads[GCHD].log_hash,

						 snod->node, snod->len);

			if (err)

				goto out;



			err = move_node(c, sleb, snod, wbuf);

			if (err)

				goto out;

			moved = 1;

		}



		if (ubifs_authenticated(c) && moved) {

			struct ubifs_auth_node *auth;



			auth = kmalloc(ubifs_auth_node_sz(c), GFP_NOFS);

			if (!auth) {

				err = -ENOMEM;

				goto out;

			}



			err = ubifs_prepare_auth_node(c, auth,

						c->jheads[GCHD].log_hash);

			if (err) {

				kfree(auth);

				goto out;

			}



			err = ubifs_wbuf_write_nolock(wbuf, auth,

						      ubifs_auth_node_sz(c));

			if (err) {

				kfree(auth);

				goto out;

			}



			ubifs_add_dirt(c, wbuf->lnum, ubifs_auth_node_sz(c));

		}



		if (list_empty(&sleb->nodes) && list_empty(&nondata))

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