ocfs2: only take lock if dio entry when recover orphans

We have no need to take inode mutex, rw and inode lock if it is not dio
entry when recover orphans.  Optimize it by adding a flag
OCFS2_INODE_DIO_ORPHAN_ENTRY to ocfs2_inode_info to reduce contention.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 47 insertions, 39 deletions

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 4bac6007837d..04d6303f39a7 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -2049,6 +2049,10 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
 	if (IS_ERR(iter))
 		return 0;
 
+	if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
+			OCFS2_DIO_ORPHAN_PREFIX_LEN))
+		OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY;
+
 	/* Skip inodes which are already added to recover list, since dio may
 	 * happen concurrently with unlink/rename */
 	if (OCFS2_I(iter)->ip_next_orphan) {
@@ -2195,25 +2199,51 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 		iter = oi->ip_next_orphan;
 		oi->ip_next_orphan = NULL;
 
-		mutex_lock(&inode->i_mutex);
-		ret = ocfs2_rw_lock(inode, 1);
-		if (ret < 0) {
-			mlog_errno(ret);
-			goto next;
-		}
-		/*
-		 * We need to take and drop the inode lock to
-		 * force read inode from disk.
-		 */
-		ret = ocfs2_inode_lock(inode, &di_bh, 1);
-		if (ret) {
-			mlog_errno(ret);
-			goto unlock_rw;
-		}
+		if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) {
+			mutex_lock(&inode->i_mutex);
+			ret = ocfs2_rw_lock(inode, 1);
+			if (ret < 0) {
+				mlog_errno(ret);
+				goto unlock_mutex;
+			}
+			/*
+			 * We need to take and drop the inode lock to
+			 * force read inode from disk.
+			 */
+			ret = ocfs2_inode_lock(inode, &di_bh, 1);
+			if (ret) {
+				mlog_errno(ret);
+				goto unlock_rw;
+			}
 
-		di = (struct ocfs2_dinode *)di_bh->b_data;
+			di = (struct ocfs2_dinode *)di_bh->b_data;
 
-		if (inode->i_nlink == 0) {
+			if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
+				ret = ocfs2_truncate_file(inode, di_bh,
+						i_size_read(inode));
+				if (ret < 0) {
+					if (ret != -ENOSPC)
+						mlog_errno(ret);
+					goto unlock_inode;
+				}
+
+				ret = ocfs2_del_inode_from_orphan(osb, inode,
+						di_bh, 0, 0);
+				if (ret)
+					mlog_errno(ret);
+			}
+unlock_inode:
+			ocfs2_inode_unlock(inode, 1);
+			brelse(di_bh);
+			di_bh = NULL;
+unlock_rw:
+			ocfs2_rw_unlock(inode, 1);
+unlock_mutex:
+			mutex_unlock(&inode->i_mutex);
+
+			/* clear dio flag in ocfs2_inode_info */
+			oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY;
+		} else {
 			spin_lock(&oi->ip_lock);
 			/* Set the proper information to get us going into
 			 * ocfs2_delete_inode. */
@@ -2221,28 +2251,6 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 			spin_unlock(&oi->ip_lock);
 		}
 
-		if ((orphan_reco_type == ORPHAN_NEED_TRUNCATE) &&
-				(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
-			ret = ocfs2_truncate_file(inode, di_bh,
-					i_size_read(inode));
-			if (ret < 0) {
-				if (ret != -ENOSPC)
-					mlog_errno(ret);
-				goto unlock_inode;
-			}
-
-			ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
-			if (ret)
-				mlog_errno(ret);
-		} /* else if ORPHAN_NO_NEED_TRUNCATE, do nothing */
-unlock_inode:
-		ocfs2_inode_unlock(inode, 1);
-		brelse(di_bh);
-		di_bh = NULL;
-unlock_rw:
-		ocfs2_rw_unlock(inode, 1);
-next:
-		mutex_unlock(&inode->i_mutex);
 		iput(inode);
 		inode = iter;
 	}