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-rw-r--r--fs/cifs/inode.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index dd4167762a8e..97ccc513730f 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1377,8 +1377,17 @@ static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1377 } 1377 }
1378 i_size_write(inode, offset); 1378 i_size_write(inode, offset);
1379 spin_unlock(&inode->i_lock); 1379 spin_unlock(&inode->i_lock);
1380 /*
1381 * unmap_mapping_range is called twice, first simply for efficiency
1382 * so that truncate_inode_pages does fewer single-page unmaps. However
1383 * after this first call, and before truncate_inode_pages finishes,
1384 * it is possible for private pages to be COWed, which remain after
1385 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1386 * call must be made for correctness.
1387 */
1380 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); 1388 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1381 truncate_inode_pages(mapping, offset); 1389 truncate_inode_pages(mapping, offset);
1390 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1382 goto out_truncate; 1391 goto out_truncate;
1383 1392
1384do_expand: 1393do_expand: