Merge commit 'v2.6.28-rc4' into timers/rtc

Conflicts:
	drivers/rtc/rtc-cmos.c

4 files changed, 64 insertions, 11 deletions

diff --git a/fs/jbd2/Kconfig b/fs/jbd2/Kconfig
new file mode 100644
index 000000000000..f32f346f4b0a
--- /dev/null
+++ b/fs/jbd2/Kconfig
@@ -0,0 +1,33 @@
+config JBD2
+        tristate
+        select CRC32
+        help
+          This is a generic journaling layer for block devices that support
+          both 32-bit and 64-bit block numbers.  It is currently used by
+          the ext4 and OCFS2 filesystems, but it could also be used to add
+          journal support to other file systems or block devices such
+          as RAID or LVM.
+
+          If you are using ext4 or OCFS2, you need to say Y here.
+          If you are not using ext4 or OCFS2 then you will
+          probably want to say N.
+
+          To compile this device as a module, choose M here. The module will be
+          called jbd2.  If you are compiling ext4 or OCFS2 into the kernel,
+          you cannot compile this code as a module.
+
+config JBD2_DEBUG
+        bool "JBD2 (ext4) debugging support"
+        depends on JBD2 && DEBUG_FS
+        help
+          If you are using the ext4 journaled file system (or
+          potentially any other filesystem/device using JBD2), this option
+          allows you to enable debugging output while the system is running,
+          in order to help track down any problems you are having.
+          By default, the debugging output will be turned off.
+
+          If you select Y here, then you will be able to turn on debugging
+          with "echo N > /sys/kernel/debug/jbd2/jbd2-debug", where N is a
+          number between 1 and 5. The higher the number, the more debugging
+          output is generated.  To turn debugging off again, do
+          "echo 0 > /sys/kernel/debug/jbd2/jbd2-debug".
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 9203c3332f17..9497718fe920 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -116,7 +116,7 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
  */
 void __jbd2_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);
@@ -129,25 +129,43 @@ void __jbd2_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 (__jbd2_log_space_left(journal) < nblocks) {
+                space_left = __jbd2_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) {
                                 jbd2_log_do_checkpoint(journal);
+                        } else if (jbd2_cleanup_journal_tail(journal) == 0) {
+                                /* We were able to recover space; yay! */
+                                ;
+                        } else if (tid) {
+                                jbd2_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 in %s\n", __func__,
+                                       journal->j_devname);
+                                WARN_ON(1);
                                 jbd2_journal_abort(journal, 0);
                         }
-
                         spin_lock(&journal->j_state_lock);
                 } else {
                         spin_unlock(&journal->j_list_lock);
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 8b119e16aa36..ebc667bc54a8 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -974,6 +974,9 @@ restart_loop:
         journal->j_committing_transaction = NULL;
         spin_unlock(&journal->j_state_lock);
 
+        if (journal->j_commit_callback)
+                journal->j_commit_callback(journal, commit_transaction);
+
         if (commit_transaction->t_checkpoint_list == NULL &&
             commit_transaction->t_checkpoint_io_list == NULL) {
                 __jbd2_journal_drop_transaction(journal, commit_transaction);
@@ -995,11 +998,8 @@ restart_loop:
         }
         spin_unlock(&journal->j_list_lock);
 
-        if (journal->j_commit_callback)
-                journal->j_commit_callback(journal, commit_transaction);
-
         trace_mark(jbd2_end_commit, "dev %s transaction %d head %d",
-                   journal->j_devname, commit_transaction->t_tid,
+                   journal->j_devname, journal->j_commit_sequence,
                    journal->j_tail_sequence);
         jbd_debug(1, "JBD: commit %d complete, head %d\n",
                   journal->j_commit_sequence, journal->j_tail_sequence);
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 783de118de92..e70d657a19f8 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1089,6 +1089,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
         if (!journal->j_wbuf) {
                 printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
                         __func__);
+                jbd2_stats_proc_exit(journal);
                 kfree(journal);
                 return NULL;
         }
@@ -1098,6 +1099,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
         if (err) {
                 printk(KERN_ERR "%s: Cannnot locate journal superblock\n",
                        __func__);
+                jbd2_stats_proc_exit(journal);
                 kfree(journal);
                 return NULL;
         }