If an attempt to perform a barrier-based write fails because the disk doesn't
support barriers, drop a message and disable barriers.
---
25-akpm/fs/jbd/commit.c | 21 +++++++++++++++++++--
1 files changed, 19 insertions(+), 2 deletions(-)
diff -puN fs/jbd/commit.c~jbd-barrier-fallback-on-failure fs/jbd/commit.c
--- 25/fs/jbd/commit.c~jbd-barrier-fallback-on-failure 2004-05-21 23:48:44.469550024 -0700
+++ 25-akpm/fs/jbd/commit.c 2004-05-21 23:50:58.396190080 -0700
@@ -638,11 +638,28 @@ wait_for_iobuf:
JBUFFER_TRACE(descriptor, "write commit block");
{
struct buffer_head *bh = jh2bh(descriptor);
+ int ret;
+
set_buffer_uptodate(bh);
if (journal->j_flags & JFS_BARRIER)
set_buffer_ordered(bh);
- sync_dirty_buffer(bh);
- if (unlikely(!buffer_uptodate(bh)))
+ ret = sync_dirty_buffer(bh);
+ if (ret == -EOPNOTSUPP && (journal->j_flags & JFS_BARRIER)) {
+ char b[BDEVNAME_SIZE];
+
+ printk(KERN_WARNING
+ "JBD: barrier-based sync failed on %s - "
+ "bisabling barriers\n",
+ bdevname(journal->j_dev, b));
+ spin_lock(&journal->j_state_lock);
+ journal->j_flags &= ~JFS_BARRIER;
+ spin_lock(&journal->j_state_lock);
+
+ /* And try again, without the barrier */
+ clear_buffer_ordered(bh);
+ ret = sync_dirty_buffer(bh);
+ }
+ if (unlikely(ret == -EIO))
err = -EIO;
put_bh(bh); /* One for getblk() */
journal_put_journal_head(descriptor);
_