[Ocfs2-devel] [PATCH] ocfs2: return f_fsid info in ocfs2_statfs()

[Coly Li]

Currently f_fsid of struct kstatfs returned from ocfs2_statfs() is undefined (at least it should be
filled with 0). Since in some conditions, f_fsid value might be used as (f_fsid, ino) pare to
uniquely identify a file, ocfs2 should return a defined unique f_fsid value from ocfs2_statfs().

This patch uses uuid_hash as a unique ID to initiate f_fsid value, the 32bits width is enough for
ocfs2 membership so far.

Signed-off-by: Coly Li <coly.li at suse.de>
---
 fs/ocfs2/super.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 43ed113..fdab98a 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1425,6 +1425,8 @@ static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_bavail = buf->f_bfree;
 	buf->f_files = numbits;
 	buf->f_ffree = freebits;
+	buf->f_fsid.val[0] = osb->uuid_hash & 0xFFFFFFFFUL;
+	buf->f_fsid.val[1] = 0;

 	brelse(bh);

-- 
Coly Li
SuSE Labs