Merge commit 'v2.6.38-rc1' into kbuild/packaging

1 files changed, 21 insertions, 39 deletions

diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index 4bd882548c45..34a4861c14b8 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -17,7 +17,6 @@
 #include <linux/fs.h>
 #include <linux/jbd.h>
 #include <linux/errno.h>
-#include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/bio.h>
@@ -120,7 +119,6 @@ static int journal_write_commit_record(journal_t *journal,
         struct buffer_head *bh;
         journal_header_t *header;
         int ret;
-        int barrier_done = 0;
 
         if (is_journal_aborted(journal))
                 return 0;
@@ -138,34 +136,12 @@ static int journal_write_commit_record(journal_t *journal,
 
         JBUFFER_TRACE(descriptor, "write commit block");
         set_buffer_dirty(bh);
-        if (journal->j_flags & JFS_BARRIER) {
-                set_buffer_ordered(bh);
-                barrier_done = 1;
-        }
-        ret = sync_dirty_buffer(bh);
-        if (barrier_done)
-                clear_buffer_ordered(bh);
-        /* is it possible for another commit to fail at roughly
-         * the same time as this one?  If so, we don't want to
-         * trust the barrier flag in the super, but instead want
-         * to remember if we sent a barrier request
-         */
-        if (ret == -EOPNOTSUPP && barrier_done) {
-                char b[BDEVNAME_SIZE];
-
-                printk(KERN_WARNING
-                        "JBD: barrier-based sync failed on %s - "
-                        "disabling barriers\n",
-                        bdevname(journal->j_dev, b));
-                spin_lock(&journal->j_state_lock);
-                journal->j_flags &= ~JFS_BARRIER;
-                spin_unlock(&journal->j_state_lock);
 
-                /* And try again, without the barrier */
-                set_buffer_uptodate(bh);
-                set_buffer_dirty(bh);
+        if (journal->j_flags & JFS_BARRIER)
+                ret = __sync_dirty_buffer(bh, WRITE_SYNC | WRITE_FLUSH_FUA);
+        else
                 ret = sync_dirty_buffer(bh);
-        }
+
         put_bh(bh);             /* One for getblk() */
         journal_put_journal_head(descriptor);
 
@@ -318,7 +294,7 @@ void journal_commit_transaction(journal_t *journal)
         int first_tag = 0;
         int tag_flag;
         int i;
-        int write_op = WRITE;
+        int write_op = WRITE_SYNC;
 
         /*
          * First job: lock down the current transaction and wait for
@@ -611,13 +587,13 @@ void journal_commit_transaction(journal_t *journal)
                 /* Bump b_count to prevent truncate from stumbling over
                    the shadowed buffer!  @@@ This can go if we ever get
                    rid of the BJ_IO/BJ_Shadow pairing of buffers. */
-                atomic_inc(&jh2bh(jh)->b_count);
+                get_bh(jh2bh(jh));
 
                 /* Make a temporary IO buffer with which to write it out
                    (this will requeue both the metadata buffer and the
                    temporary IO buffer). new_bh goes on BJ_IO*/
 
-                set_bit(BH_JWrite, &jh2bh(jh)->b_state);
+                set_buffer_jwrite(jh2bh(jh));
                 /*
                  * akpm: journal_write_metadata_buffer() sets
                  * new_bh->b_transaction to commit_transaction.
@@ -627,7 +603,7 @@ void journal_commit_transaction(journal_t *journal)
                 JBUFFER_TRACE(jh, "ph3: write metadata");
                 flags = journal_write_metadata_buffer(commit_transaction,
                                                       jh, &new_jh, blocknr);
-                set_bit(BH_JWrite, &jh2bh(new_jh)->b_state);
+                set_buffer_jwrite(jh2bh(new_jh));
                 wbuf[bufs++] = jh2bh(new_jh);
 
                 /* Record the new block's tag in the current descriptor
@@ -737,7 +713,7 @@ wait_for_iobuf:
                    shadowed buffer */
                 jh = commit_transaction->t_shadow_list->b_tprev;
                 bh = jh2bh(jh);
-                clear_bit(BH_JWrite, &bh->b_state);
+                clear_buffer_jwrite(bh);
                 J_ASSERT_BH(bh, buffer_jbddirty(bh));
 
                 /* The metadata is now released for reuse, but we need
@@ -787,6 +763,12 @@ wait_for_iobuf:
 
         jbd_debug(3, "JBD: commit phase 6\n");
 
+        /* All metadata is written, now write commit record and do cleanup */
+        spin_lock(&journal->j_state_lock);
+        J_ASSERT(commit_transaction->t_state == T_COMMIT);
+        commit_transaction->t_state = T_COMMIT_RECORD;
+        spin_unlock(&journal->j_state_lock);
+
         if (journal_write_commit_record(journal, commit_transaction))
                 err = -EIO;
 
@@ -862,12 +844,12 @@ restart_loop:
                 /* A buffer which has been freed while still being
                  * journaled by a previous transaction may end up still
                  * being dirty here, but we want to avoid writing back
-                 * that buffer in the future now that the last use has
-                 * been committed.  That's not only a performance gain,
-                 * it also stops aliasing problems if the buffer is left
-                 * behind for writeback and gets reallocated for another
+                 * that buffer in the future after the "add to orphan"
+                 * operation been committed,  That's not only a performance
+                 * gain, it also stops aliasing problems if the buffer is
+                 * left behind for writeback and gets reallocated for another
                  * use in a different page. */
-                if (buffer_freed(bh)) {
+                if (buffer_freed(bh) && !jh->b_next_transaction) {
                         clear_buffer_freed(bh);
                         clear_buffer_jbddirty(bh);
                 }
@@ -924,7 +906,7 @@ restart_loop:
 
         jbd_debug(3, "JBD: commit phase 8\n");
 
-        J_ASSERT(commit_transaction->t_state == T_COMMIT);
+        J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD);
 
         commit_transaction->t_state = T_FINISHED;
         J_ASSERT(commit_transaction == journal->j_committing_transaction);