Merge tag 'upstream-3.6-rc1' of git://git.infradead.org/linux-ubifs

Pull UBIFS updates from Artem Bityutskiy:

 - Added another debugfs knob for forcing UBIFS R/O mode without
   flushing caches or finishing commit or any other I/O operation.  I've
   originally added this knob in order to reproduce the free space fixup
   bug (see commit c6727932: "UBIFS: fix a bug in empty space
   fix-up") on nandsim.

   Without this knob I would have to do real power-cuts, which would
   make debugging much harder.  Then I've decided to keep this knob
   because it is also useful for UBIFS power-cut recovery end
   error-paths testing.

 - Well-spotted fix from Julia.  This bug did not cause real troubles
   for UBIFS, but nevertheless it could cause issues for someone trying
   to modify the orphans handling code.  Kudos to coccinelle!

 - Minor cleanups.

* tag 'upstream-3.6-rc1' of git://git.infradead.org/linux-ubifs:
  UBIFS: remove invalid reference to list iterator variable
  UBIFS: simplify reply code a bit
  UBIFS: add debugfs knob to switch to R/O mode
  UBIFS: fix compilation warning

fs/ubifs/debug.c

@@ -2802,6 +2802,8 @@ static ssize_t dfs_file_read(struct file *file, char __user *u, size_t count,
 		val = d->chk_fs;
 	else if (dent == d->dfs_tst_rcvry)
 		val = d->tst_rcvry;
+	else if (dent == d->dfs_ro_error)
+		val = c->ro_error;
 	else
 		return -EINVAL;
 
@@ -2885,6 +2887,8 @@ static ssize_t dfs_file_write(struct file *file, const char __user *u,
 		d->chk_fs = val;
 	else if (dent == d->dfs_tst_rcvry)
 		d->tst_rcvry = val;
+	else if (dent == d->dfs_ro_error)
+		c->ro_error = !!val;
 	else
 		return -EINVAL;
 
@@ -2996,6 +3000,13 @@ int dbg_debugfs_init_fs(struct ubifs_info *c)
 		goto out_remove;
 	d->dfs_tst_rcvry = dent;
 
+	fname = "ro_error";
+	dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
+				   &dfs_fops);
+	if (IS_ERR_OR_NULL(dent))
+		goto out_remove;
+	d->dfs_ro_error = dent;
+
 	return 0;
 
 out_remove:

fs/ubifs/debug.h

@@ -79,6 +79,10 @@ typedef int (*dbg_znode_callback)(struct ubifs_info *c,
  * @dfs_chk_lprops: debugfs knob to enable UBIFS LEP properties extra checks
  * @dfs_chk_fs: debugfs knob to enable UBIFS contents extra checks
  * @dfs_tst_rcvry: debugfs knob to enable UBIFS recovery testing
+ * @dfs_ro_error: debugfs knob to switch UBIFS to R/O mode (different to
+ *                re-mounting to R/O mode because it does not flush any buffers
+ *                and UBIFS just starts returning -EROFS on all write
+ *               operations)
  */
 struct ubifs_debug_info {
 	struct ubifs_zbranch old_zroot;
@@ -122,6 +126,7 @@ struct ubifs_debug_info {
 	struct dentry *dfs_chk_lprops;
 	struct dentry *dfs_chk_fs;
 	struct dentry *dfs_tst_rcvry;
+	struct dentry *dfs_ro_error;
 };
 
 /**

fs/ubifs/dir.c

@@ -969,7 +969,7 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
 			.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
 	struct timespec time;
-	unsigned int saved_nlink;
+	unsigned int uninitialized_var(saved_nlink);
 
 	/*
 	 * Budget request settings: deletion direntry, new direntry, removing

fs/ubifs/orphan.c

@@ -176,7 +176,7 @@ int ubifs_orphan_start_commit(struct ubifs_info *c)
 		*last = orphan;
 		last = &orphan->cnext;
 	}
-	*last = orphan->cnext;
+	*last = NULL;
 	c->cmt_orphans = c->new_orphans;
 	c->new_orphans = 0;
 	dbg_cmt("%d orphans to commit", c->cmt_orphans);
@@ -382,7 +382,7 @@ static int consolidate(struct ubifs_info *c)
 			last = &orphan->cnext;
 			cnt += 1;
 		}
-		*last = orphan->cnext;
+		*last = NULL;
 		ubifs_assert(cnt == c->tot_orphans - c->new_orphans);
 		c->cmt_orphans = cnt;
 		c->ohead_lnum = c->orph_first;

fs/ubifs/replay.c

@@ -1007,7 +1007,7 @@ static int take_ihead(struct ubifs_info *c)
  */
 int ubifs_replay_journal(struct ubifs_info *c)
 {
-	int err, i, lnum, offs, free;
+	int err, lnum, free;
 
 	BUILD_BUG_ON(UBIFS_TRUN_KEY > 5);
 
@@ -1025,25 +1025,17 @@ int ubifs_replay_journal(struct ubifs_info *c)
 	dbg_mnt("start replaying the journal");
 	c->replaying = 1;
 	lnum = c->ltail_lnum = c->lhead_lnum;
-	offs = c->lhead_offs;
 
-	for (i = 0; i < c->log_lebs; i++, lnum++) {
-		if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) {
-			/*
-			 * The log is logically circular, we reached the last
-			 * LEB, switch to the first one.
-			 */
-			lnum = UBIFS_LOG_LNUM;
-			offs = 0;
-		}
-		err = replay_log_leb(c, lnum, offs, c->sbuf);
+	lnum = UBIFS_LOG_LNUM;
+	do {
+		err = replay_log_leb(c, lnum, 0, c->sbuf);
 		if (err == 1)
 			/* We hit the end of the log */
 			break;
 		if (err)
 			goto out;
-		offs = 0;
-	}
+		lnum = ubifs_next_log_lnum(c, lnum);
+	} while (lnum != UBIFS_LOG_LNUM);
 
 	err = replay_buds(c);
 	if (err)