ceph: fix SEEK_CUR, SEEK_SET regression

Commit 06222e491e663dac939f04b125c9dc52126a75c4 got the if wrong so that
it always evaluates as true.  This is semantically harmless, but makes
SEEK_CUR and SEEK_SET needlessly query the server.

Rewrite the if to explicitly enumerate the cases we DO need a valid i_size
to make this code less fragile.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index af187330cc8993b2cac6371ba15b7f4549235f6a..ed72428d9c75c80a6744ccd6a996b83c1a20d333 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -797,7 +797,8 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
 
        mutex_lock(&inode->i_mutex);
        __ceph_do_pending_vmtruncate(inode);
-       if (origin != SEEK_CUR || origin != SEEK_SET) {
+
+       if (origin == SEEK_END || origin == SEEK_DATA || origin == SEEK_HOLE) {
                ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
                if (ret < 0) {
                        offset = ret;