From: Li Dongyang <dongyang.li@anu.edu.au>
Date: Thu, 8 Jan 2015 00:02:24 +0000 (+1100)
Subject: LU-6091 llite: glimpse the inode before doing fiemap
X-Git-Tag: 2.6.93~55
X-Git-Url: https://git.whamcloud.com/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F80%2F13280%2F3;p=fs%2Flustre-release.git

LU-6091 llite: glimpse the inode before doing fiemap

For a new inode, the i_size is 0 until a stat, which will yield
an empty fiemap result.
Fix the issue by glimpsing the size before doing fiemap.

Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au>
Change-Id: I072fd1f5e13c7fd127199a10b44366aed145b8e1
Reviewed-on: http://review.whamcloud.com/13280
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
---

diff --git a/lustre/llite/file.c b/lustre/llite/file.c
index e4bed5d..9dd6906 100644
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -1794,6 +1794,12 @@ static int ll_do_fiemap(struct inode *inode, struct ll_user_fiemap *fiemap,
 	fm_key.oa.o_oi = lsm->lsm_oi;
         fm_key.oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
 
+	if (i_size_read(inode) == 0) {
+		rc = ll_glimpse_size(inode);
+		if (rc)
+			GOTO(out, rc);
+	}
+
         obdo_from_inode(&fm_key.oa, inode, OBD_MD_FLSIZE);
         obdo_set_parent_fid(&fm_key.oa, &ll_i2info(inode)->lli_fid);
         /* If filesize is 0, then there would be no objects for mapping */