From: Bob Peterson Date: Wed, 29 Oct 2014 13:02:29 +0000 (-0500) Subject: GFS2: Only increase rs_sizehint X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=33ad5d54284adf110f6e78aa9c4f42d3d17d7f68;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git GFS2: Only increase rs_sizehint If an application does a sequence of (1) big write, (2) little write we don't necessarily want to reset the size hint based on the smaller size. The fact that they did any big writes implies they may do more, and therefore we should try to allocate bigger block reservations, even if the last few were small writes. Therefore this patch changes function gfs2_size_hint so that the size hint can only grow; it cannot shrink. This is especially important where there are multiple writers. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse --- diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 80dd44dca028..5ebe56831794 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -337,7 +337,8 @@ static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; int hint = min_t(size_t, INT_MAX, blks); - atomic_set(&ip->i_res->rs_sizehint, hint); + if (hint > atomic_read(&ip->i_res->rs_sizehint)) + atomic_set(&ip->i_res->rs_sizehint, hint); } /**