From 3799b3f4adff8b00017340d0b9b41a99e0cc3804 Mon Sep 17 00:00:00 2001 From: Mark Tomlinson Date: Wed, 1 Jul 2015 16:38:22 +1200 Subject: 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 --- fs/jffs2/jffs2_1pass.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c index b1d64702192..2e569ff59bb 100644 --- a/fs/jffs2/jffs2_1pass.c +++ b/fs/jffs2/jffs2_1pass.c @@ -719,6 +719,12 @@ jffs2_1pass_read_inode(struct b_lists *pL, u32 inode, char *dest) } 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) { -- cgit v1.2.3