new helper: ihold()

Clones an existing reference to inode; caller must already hold one.

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

1 files changed, 4 insertions, 4 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index b737451e2e9d..81972eb34b39 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -550,7 +550,7 @@ EXPORT_SYMBOL(bdget);
  */
 struct block_device *bdgrab(struct block_device *bdev)
 {
-        atomic_inc(&bdev->bd_inode->i_count);
+        ihold(bdev->bd_inode);
         return bdev;
 }
 
@@ -580,7 +580,7 @@ static struct block_device *bd_acquire(struct inode *inode)
         spin_lock(&bdev_lock);
         bdev = inode->i_bdev;
         if (bdev) {
-                atomic_inc(&bdev->bd_inode->i_count);
+                ihold(bdev->bd_inode);
                 spin_unlock(&bdev_lock);
                 return bdev;
         }
@@ -591,12 +591,12 @@ static struct block_device *bd_acquire(struct inode *inode)
                 spin_lock(&bdev_lock);
                 if (!inode->i_bdev) {
                         /*
-                         * We take an additional bd_inode->i_count for inode,
+                         * We take an additional reference to bd_inode,
                          * and it's released in clear_inode() of inode.
                          * So, we can access it via ->i_mapping always
                          * without igrab().
                          */
-                        atomic_inc(&bdev->bd_inode->i_count);
+                        ihold(bdev->bd_inode);
                         inode->i_bdev = bdev;
                         inode->i_mapping = bdev->bd_inode->i_mapping;
                         list_add(&inode->i_devices, &bdev->bd_inodes);