new helper: inode_unhashed()

note: for race-free uses you inode_lock held

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/btrfs/inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c038644..f6f2a0d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3849,7 +3849,7 @@
 	p = &root->inode_tree.rb_node;
 	parent = NULL;
 
-	if (hlist_unhashed(&inode->i_hash))
+	if (inode_unhashed(inode))
 		return;
 
 	spin_lock(&root->inode_lock);

fs/fs-writeback.c

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 29e3f40..39f44f2 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -962,7 +962,7 @@
 		 * dirty list.  Add blockdev inodes as well.
 		 */
 		if (!S_ISBLK(inode->i_mode)) {
-			if (hlist_unhashed(&inode->i_hash))
+			if (inode_unhashed(inode))
 				goto out;
 		}
 		if (inode->i_state & I_FREEING)

fs/inode.c

diff --git a/fs/inode.c b/fs/inode.c
index db7c74c7..4440cf1 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1094,7 +1094,7 @@
 		__iget(old);
 		spin_unlock(&inode_lock);
 		wait_on_inode(old);
-		if (unlikely(!hlist_unhashed(&old->i_hash))) {
+		if (unlikely(!inode_unhashed(old))) {
 			iput(old);
 			return -EBUSY;
 		}
@@ -1133,7 +1133,7 @@
 		__iget(old);
 		spin_unlock(&inode_lock);
 		wait_on_inode(old);
-		if (unlikely(!hlist_unhashed(&old->i_hash))) {
+		if (unlikely(!inode_unhashed(old))) {
 			iput(old);
 			return -EBUSY;
 		}
@@ -1186,7 +1186,7 @@
  */
 int generic_drop_inode(struct inode *inode)
 {
-	return !inode->i_nlink || hlist_unhashed(&inode->i_hash);
+	return !inode->i_nlink || inode_unhashed(inode);
 }
 EXPORT_SYMBOL_GPL(generic_drop_inode);
 

fs/reiserfs/xattr.c

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index f7415de..5d04a78 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -422,7 +422,7 @@
 static void update_ctime(struct inode *inode)
 {
 	struct timespec now = current_fs_time(inode->i_sb);
-	if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink ||
+	if (inode_unhashed(inode) || !inode->i_nlink ||
 	    timespec_equal(&inode->i_ctime, &now))
 		return;
 

include/linux/fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c3f6daf..78043da 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -786,6 +786,11 @@
 	void			*i_private; /* fs or device private pointer */
 };
 
+static inline int inode_unhashed(struct inode *inode)
+{
+	return hlist_unhashed(&inode->i_hash);
+}
+
 /*
  * inode->i_mutex nesting subclasses for the lock validator:
  *

mm/shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 080b09a..27a5812 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2146,7 +2146,7 @@
 	if (*len < 3)
 		return 255;
 
-	if (hlist_unhashed(&inode->i_hash)) {
+	if (inode_unhashed(inode)) {
 		/* Unfortunately insert_inode_hash is not idempotent,
 		 * so as we hash inodes here rather than at creation
 		 * time, we need a lock to ensure we only try
@@ -2154,7 +2154,7 @@
 		 */
 		static DEFINE_SPINLOCK(lock);
 		spin_lock(&lock);
-		if (hlist_unhashed(&inode->i_hash))
+		if (inode_unhashed(inode))
 			__insert_inode_hash(inode,
 					    inode->i_ino + inode->i_generation);
 		spin_unlock(&lock);