new helper: inode_unhashed()

note: for race-free uses you inode_lock held

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

6 files changed, 13 insertions, 8 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c03864406af3..f6f2a0da2695 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3849,7 +3849,7 @@ again:
         p = &root->inode_tree.rb_node;
         parent = NULL;
 
-        if (hlist_unhashed(&inode->i_hash))
+        if (inode_unhashed(inode))
                 return;
 
         spin_lock(&root->inode_lock);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 29e3f409bbd0..39f44f2e709a 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -962,7 +962,7 @@ void __mark_inode_dirty(struct inode *inode, int flags)
                  * 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)
diff --git a/fs/inode.c b/fs/inode.c
index db7c74c7dd80..4440cf1034ec 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1094,7 +1094,7 @@ int insert_inode_locked(struct inode *inode)
                 __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 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
                 __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 @@ EXPORT_SYMBOL(generic_delete_inode);
  */
 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);
 
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index f7415de13878..5d04a7828e7a 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -422,7 +422,7 @@ int reiserfs_commit_write(struct file *f, struct page *page,
 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;
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c3f6daf749cc..78043da85e1f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -786,6 +786,11 @@ struct inode {
         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:
  *
diff --git a/mm/shmem.c b/mm/shmem.c
index 080b09a57a8f..27a58120dbd5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2146,7 +2146,7 @@ static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
         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 int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
                  */
                 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);