JFFS2: Return early when file read not necessary

If a destination is not provided, jffs2_1pass_read_inode() only returns the length of the file. In this case, avoid reading all the data nodes, and return as soon as the length of the file is known. Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>

JFFS2: Return early when file read not necessary
If a destination is not provided, jffs2_1pass_read_inode() only returns the length of the file. In this case, avoid reading all the data nodes, and return as soon as the length of the file is known. Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Mark Tomlinson · Tom Rini
1 parent 39d0ce0659
Showing 1 changed file with 6 additions and 0 deletions Side-by-side Diff
fs/jffs2/jffs2_1pass.c
@@ -719,6 +719,12 @@
 		}
 		put_fl_mem(jNode, pL->readbuf);
 	}
+	/*
+	 * If no destination is provided, we are done.
+	 * Just return the total size.
+	 */
+	if (!dest)
+		return totalSize;
 #endif
  
 	for (b = pL->frag.listHead; b != NULL; b = b->next) {
...	...	@@ -719,6 +719,12 @@
719	719	}
720	720	put_fl_mem(jNode, pL->readbuf);
721	721	}
	722	+ /*
	723	+ * If no destination is provided, we are done.
	724	+ * Just return the total size.
	725	+ */
	726	+ if (!dest)
	727	+ return totalSize;
722	728	#endif
723	729
724	730	for (b = pL->frag.listHead; b != NULL; b = b->next) {