Merge tag 'for-6.15-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - fix potential inode leak in iget() after memory allocation failure

 - in subpage mode, fix extent buffer bitmap iteration when writing out
   dirty sectors

 - fix range calculation when falling back to COW for a NOCOW file

* tag 'for-6.15-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: adjust subpage bit start based on sectorsize
  btrfs: fix the inode leak in btrfs_iget()
  btrfs: fix COW handling in run_delalloc_nocow()

Author: torvalds

fs/btrfs/extent_io.c

@@ -2047,7 +2047,7 @@ static int submit_eb_subpage(struct folio *folio, struct writeback_control *wbc)
 			      subpage->bitmaps)) {
 			spin_unlock_irqrestore(&subpage->lock, flags);
 			spin_unlock(&folio->mapping->i_private_lock);
-			bit_start++;
+			bit_start += sectors_per_node;
 			continue;
 		}
 

fs/btrfs/inode.c

@@ -2129,12 +2129,13 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
 
 		/*
 		 * If the found extent starts after requested offset, then
-		 * adjust extent_end to be right before this extent begins
+		 * adjust cur_offset to be right before this extent begins.
 		 */
 		if (found_key.offset > cur_offset) {
-			extent_end = found_key.offset;
-			extent_type = 0;
-			goto must_cow;
+			if (cow_start == (u64)-1)
+				cow_start = cur_offset;
+			cur_offset = found_key.offset;
+			goto next_slot;
 		}
 
 		/*
@@ -5681,8 +5682,10 @@ struct btrfs_inode *btrfs_iget(u64 ino, struct btrfs_root *root)
 		return inode;
 
 	path = btrfs_alloc_path();
-	if (!path)
+	if (!path) {
+		iget_failed(&inode->vfs_inode);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	ret = btrfs_read_locked_inode(inode, path);
 	btrfs_free_path(path);