Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

Pull XFS update (part 2) from Ben Myers:
 "Fixes for tracing of xfs_name strings, flag handling in
  open_by_handle, a log space hang with freeze/unfreeze, fstrim offset
  calculations, a section mismatch with xfs_qm_exit, an oops in
  xlog_recover_process_iunlinks, and a deadlock in xfs_rtfree_extent.

  There are also additional trace points for attributes, and the
  addition of a workqueue for allocation to work around kernel stack
  size limitations."

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: add lots of attribute trace points
  xfs: Fix oops on IO error during xlog_recover_process_iunlinks()
  xfs: fix fstrim offset calculations
  xfs: Account log unmount transaction correctly
  xfs: don't cache inodes read through bulkstat
  xfs: trace xfs_name strings correctly
  xfs: introduce an allocation workqueue
  xfs: Fix open flag handling in open_by_handle code
  xfs: fix deadlock in xfs_rtfree_extent
  fs: xfs: fix section mismatch in linux-next

1 files changed, 33 insertions, 0 deletions

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 912442cf0f8..dab9a5f6dfd 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -950,6 +950,22 @@ xfs_fs_evict_inode(
 	xfs_inactive(ip);
 }
 
+/*
+ * We do an unlocked check for XFS_IDONTCACHE here because we are already
+ * serialised against cache hits here via the inode->i_lock and igrab() in
+ * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
+ * racing with us, and it avoids needing to grab a spinlock here for every inode
+ * we drop the final reference on.
+ */
+STATIC int
+xfs_fs_drop_inode(
+	struct inode		*inode)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+
+	return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
+}
+
 STATIC void
 xfs_free_fsname(
 	struct xfs_mount	*mp)
@@ -1433,6 +1449,7 @@ static const struct super_operations xfs_super_operations = {
 	.destroy_inode		= xfs_fs_destroy_inode,
 	.dirty_inode		= xfs_fs_dirty_inode,
 	.evict_inode		= xfs_fs_evict_inode,
+	.drop_inode		= xfs_fs_drop_inode,
 	.put_super		= xfs_fs_put_super,
 	.sync_fs		= xfs_fs_sync_fs,
 	.freeze_fs		= xfs_fs_freeze,
@@ -1606,12 +1623,28 @@ xfs_init_workqueues(void)
 	xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);
 	if (!xfs_syncd_wq)
 		return -ENOMEM;
+
+	/*
+	 * The allocation workqueue can be used in memory reclaim situations
+	 * (writepage path), and parallelism is only limited by the number of
+	 * AGs in all the filesystems mounted. Hence use the default large
+	 * max_active value for this workqueue.
+	 */
+	xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
+	if (!xfs_alloc_wq)
+		goto out_destroy_syncd;
+
 	return 0;
+
+out_destroy_syncd:
+	destroy_workqueue(xfs_syncd_wq);
+	return -ENOMEM;
 }
 
 STATIC void
 xfs_destroy_workqueues(void)
 {
+	destroy_workqueue(xfs_alloc_wq);
 	destroy_workqueue(xfs_syncd_wq);
 }