1 files changed, 24 insertions, 7 deletions

diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
index 1bd8d4acc6f2..61f32f3868cd 100644
--- a/fs/jbd/checkpoint.c
+++ b/fs/jbd/checkpoint.c
@@ -115,7 +115,7 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
  */
 void __log_wait_for_space(journal_t *journal)
 {
-        int nblocks;
+        int nblocks, space_left;
         assert_spin_locked(&journal->j_state_lock);
 
         nblocks = jbd_space_needed(journal);
@@ -128,25 +128,42 @@ void __log_wait_for_space(journal_t *journal)
                 /*
                  * Test again, another process may have checkpointed while we
                  * were waiting for the checkpoint lock. If there are no
-                 * outstanding transactions there is nothing to checkpoint and
-                 * we can't make progress. Abort the journal in this case.
+                 * transactions ready to be checkpointed, try to recover
+                 * journal space by calling cleanup_journal_tail(), and if
+                 * that doesn't work, by waiting for the currently committing
+                 * transaction to complete.  If there is absolutely no way
+                 * to make progress, this is either a BUG or corrupted
+                 * filesystem, so abort the journal and leave a stack
+                 * trace for forensic evidence.
                  */
                 spin_lock(&journal->j_state_lock);
                 spin_lock(&journal->j_list_lock);
                 nblocks = jbd_space_needed(journal);
-                if (__log_space_left(journal) < nblocks) {
+                space_left = __log_space_left(journal);
+                if (space_left < nblocks) {
                         int chkpt = journal->j_checkpoint_transactions != NULL;
+                        tid_t tid = 0;
 
+                        if (journal->j_committing_transaction)
+                                tid = journal->j_committing_transaction->t_tid;
                         spin_unlock(&journal->j_list_lock);
                         spin_unlock(&journal->j_state_lock);
                         if (chkpt) {
                                 log_do_checkpoint(journal);
+                        } else if (cleanup_journal_tail(journal) == 0) {
+                                /* We were able to recover space; yay! */
+                                ;
+                        } else if (tid) {
+                                log_wait_commit(journal, tid);
                         } else {
-                                printk(KERN_ERR "%s: no transactions\n",
-                                       __func__);
+                                printk(KERN_ERR "%s: needed %d blocks and "
+                                       "only had %d space available\n",
+                                       __func__, nblocks, space_left);
+                                printk(KERN_ERR "%s: no way to get more "
+                                       "journal space\n", __func__);
+                                WARN_ON(1);
                                 journal_abort(journal, 0);
                         }
-
                         spin_lock(&journal->j_state_lock);
                 } else {
                         spin_unlock(&journal->j_list_lock);