fix file specification in comments

[powerpc.git] / fs / jbd2 / transaction.c

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index b6cf2be..7946ff4 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1,5 +1,5 @@
 /*
- * linux/fs/transaction.c
+ * linux/fs/jbd2/transaction.c
  *
  * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
  *
@@ -23,10 +23,11 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/timer.h>
-#include <linux/smp_lock.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>
 
+static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh);
+
 /*
  * jbd2_get_transaction: obtain a new transaction_t object.
  *
@@ -967,6 +968,13 @@ int jbd2_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
         */
        jbd_lock_bh_state(bh);
        spin_lock(&journal->j_list_lock);
+
+       /* Now that we have bh_state locked, are we really still mapped? */
+       if (!buffer_mapped(bh)) {
+               JBUFFER_TRACE(jh, "unmapped buffer, bailing out");
+               goto no_journal;
+       }
+
        if (jh->b_transaction) {
                JBUFFER_TRACE(jh, "has transaction");
                if (jh->b_transaction != handle->h_transaction) {
@@ -1028,6 +1036,11 @@ int jbd2_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
                                sync_dirty_buffer(bh);
                                jbd_lock_bh_state(bh);
                                spin_lock(&journal->j_list_lock);
+                               /* Since we dropped the lock... */
+                               if (!buffer_mapped(bh)) {
+                                       JBUFFER_TRACE(jh, "buffer got unmapped");
+                                       goto no_journal;
+                               }
                                /* The buffer may become locked again at any
                                   time if it is redirtied */
                        }
@@ -1824,6 +1837,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
                        }
                }
        } else if (transaction == journal->j_committing_transaction) {
+               JBUFFER_TRACE(jh, "on committing transaction");
                if (jh->b_jlist == BJ_Locked) {
                        /*
                         * The buffer is on the committing transaction's locked
@@ -1838,7 +1852,6 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
                 * can remove it's next_transaction pointer from the
                 * running transaction if that is set, but nothing
                 * else. */
-               JBUFFER_TRACE(jh, "on committing transaction");
                set_buffer_freed(bh);
                if (jh->b_next_transaction) {
                        J_ASSERT(jh->b_next_transaction ==
@@ -1858,6 +1871,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
                 * i_size already for this truncate so recovery will not
                 * expose the disk blocks we are discarding here.) */
                J_ASSERT_JH(jh, transaction == journal->j_running_transaction);
+               JBUFFER_TRACE(jh, "on running transaction");
                may_free = __dispose_buffer(jh, transaction);
        }