knfsd: exportfs: add find_disconnected_root helper

dd90b509 · Christoph Hellwig <[email protected]> · 2007-07-17 04:04:32 -07:00

Break the loop that finds the root of a disconnected subtree into a helper of
its own to make reading easier and document the intent.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: dd90b50906db2c03e236e046f2fc7f7290efe4b4
Parents: fb66a198

Changes

1 files changed · +23 −16

File	Status	Add	Del	Content
fs/exportfs/expfs.c	modified	+23	−16	View file

fs/exportfs/expfs.c

View file

diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 085d6c5..166d8ca 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -70,6 +70,27 @@ find_acceptable_alias(struct dentry *result,
 	return NULL;
 }
 
+/*
+ * Find root of a disconnected subtree and return a reference to it.
+ */
+static struct dentry *
+find_disconnected_root(struct dentry *dentry)
+{
+	dget(dentry);
+	spin_lock(&dentry->d_lock);
+	while (!IS_ROOT(dentry) &&
+	       (dentry->d_parent->d_flags & DCACHE_DISCONNECTED)) {
+		struct dentry *parent = dentry->d_parent;
+		dget(parent);
+		spin_unlock(&dentry->d_lock);
+		dput(dentry);
+		dentry = parent;
+		spin_lock(&dentry->d_lock);
+	}
+	spin_unlock(&dentry->d_lock);
+	return dentry;
+}
+
 /**
  * find_exported_dentry - helper routine to implement export_operations->decode_fh
  * @sb:		The &super_block identifying the filesystem
@@ -164,23 +185,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
 	 * the noprogress counter.  If we go through the loop 10 times (2 is
 	 * probably enough) without getting anywhere, we just give up
 	 */
-	noprogress= 0;
+	noprogress = 0;
 	while (target_dir->d_flags & DCACHE_DISCONNECTED && noprogress++ < 10) {
-		struct dentry *pd = target_dir;
-
-		dget(pd);
-		spin_lock(&pd->d_lock);
-		while (!IS_ROOT(pd) &&
-				(pd->d_parent->d_flags&DCACHE_DISCONNECTED)) {
-			struct dentry *parent = pd->d_parent;
-
-			dget(parent);
-			spin_unlock(&pd->d_lock);
-			dput(pd);
-			pd = parent;
-			spin_lock(&pd->d_lock);
-		}
-		spin_unlock(&pd->d_lock);
+		struct dentry *pd = find_disconnected_root(target_dir);
 
 		if (!IS_ROOT(pd)) {
 			/* must have found a connected parent - great */