From: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Date: Mon, 28 Apr 2014 09:12:36 +0000 (+0900)
Subject: f2fs: consider fallocated space for SEEK_DATA
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~73^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f7670fe9fe47e7e56db658eb8831febe47627f2;p=pandora-kernel.git

f2fs: consider fallocated space for SEEK_DATA

If an amount of data are allocated though fallocate and user writes a couple of
data among the space, f2fs should return the data offset made by user when
SEEK_DATA is requested.

For example, (N: NEW_ADDR by fallocate, X: NEW_ADDR by user)
1) fallocate 0 ~ 10MB
f -> N N N N N N N N N N N N ... N

2) write 4KB at 5MB offset
f -> N N N N N X N N N N N N ... N

3) SEEK_DATA from 0 should return 5MB offset

So, this patch adds a routine to search the first dirty page to handle that.
Then, the SEEK_DATA flow skips NEW_ADDR offsets until any dirty page is found.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
---

Reading git-diff-tree failed