staging: west bridge: cyasgadget, remove file system / vfs calls

This patch remove file system specific (fat_get_block) and vfs calls
from the cyasgadget driver. The current implementation expects user
space to write the file (open, seek to end, 1 byte write), followed by a
call to clear the dirty pages from the the page cache.
Signed-off-by: David Cross <david.cross@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/westbridge/astoria/gadget/cyasgadget.c

@@ -1149,11 +1149,9 @@ static int cyasgadget_ioctl(
 			struct inode *inode = mapping->host;
 			struct inode *alloc_inode =
 				file_to_allocate->f_path.dentry->d_inode;
-			int cluster = 0;
 			uint32_t num_clusters = 0;
 			struct buffer_head bh;
 			struct kstat stat;
-			struct iattr alloc_iattr;
 			int nr_pages = 0;
 			int ret_stat = 0;
 
@@ -1188,47 +1186,7 @@ static int cyasgadget_ioctl(
 			/* block size is arbitrary , we'll use sector size*/
 			bh.b_size = SECTOR_SIZE ;
 
-			#ifndef WESTBRIDGE_NDEBUG
-			cy_as_hal_print_message("%s: getting fat blocks %d "
-				"size of  %d\n", __func__,
-				num_clusters, bh.b_size);
-			#endif
-			for (cluster = 0; cluster < num_clusters; cluster++)  {
-				ret_stat = fat_get_block(inode,
-					cluster, &bh, 1);
-				if (ret_stat) {
-					cy_as_hal_print_message(
-						"%s: unable to get fat block, "
-						"ret_stat=0x%d\n",
-						__func__, ret_stat);
-					goto initsoj_safe_exit;
-				}
-			}
 
-			#ifndef WESTBRIDGE_NDEBUG
-			cy_as_hal_print_message("%s: allocated clusters "
-				"successfully (fat_get_block), check bmap..."
-				"\n", __func__);
-			#endif
-
-			alloc_iattr.ia_valid = ATTR_SIZE;
-			alloc_iattr.ia_size = k_d.num_bytes;
-
-			#ifndef WESTBRIDGE_NDEBUG
-			cy_as_hal_print_message("%s: calling fat_notify_change "
-				"(ia_valid:%d, ia_size:%d)\n", __func__,
-				alloc_iattr.ia_valid,
-				(int)alloc_iattr.ia_size);
-			#endif
-
-			/* adjust the filesize */
-			ret_stat = alloc_inode->i_op->setattr(
-				file_to_allocate->f_path.dentry, &alloc_iattr);
-			#ifndef WESTBRIDGE_NDEBUG
-			cy_as_hal_print_message("%s: fat_setattr() "
-				"returned 0x%x\n",
-				__func__, ret_stat);
-			#endif
 
 			/* clear dirty pages in page cache
 			 * (if were any allocated) */