Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

[sfrench/cifs-2.6.git] / fs / jbd / checkpoint.c

diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
index 1bd8d4acc6f2124a7574001d454a25b971fd9852..61f32f3868cd1833927e394009d780e7d371e6e2 100644 (file)
--- 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);