staging: lustre: lov: Ensure correct operation for large object sizes

If a backing filesystem (ZFS) returns that it supports very large
(LLONG_MAX) object sizes, that should be correctly supported.  This
fixes the check for unitialized stripe_maxbytes in
lsm_unpackmd_common(), so that ZFS can return LLONG_MAX and it will be
okay. This issue is excersized by writing to or past the 2TB boundry
of a singly stripped file.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7890
Reviewed-on: http://review.whamcloud.com/19066
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/lov/lov_ea.c b/drivers/staging/lustre/lustre/lov/lov_ea.c
index ac0bf64..2a8fee8 100644 (file)
--- a/drivers/staging/lustre/lustre/lov/lov_ea.c
+++ b/drivers/staging/lustre/lustre/lov/lov_ea.c
@@ -150,9 +150,10 @@ static int lsm_unpackmd_common(struct lov_obd *lov,
                               struct lov_mds_md *lmm,
                               struct lov_ost_data_v1 *objects)
 {
-       loff_t stripe_maxbytes = LLONG_MAX;
+       loff_t min_stripe_maxbytes = 0;
        unsigned int stripe_count;
        struct lov_oinfo *loi;
+       loff_t lov_bytes;
        unsigned int i;
 
        /*
@@ -168,8 +169,6 @@ static int lsm_unpackmd_common(struct lov_obd *lov,
        stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 
        for (i = 0; i < stripe_count; i++) {
-               loff_t tgt_bytes;
-
                loi = lsm->lsm_oinfo[i];
                ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
                loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
@@ -194,17 +193,21 @@ static int lsm_unpackmd_common(struct lov_obd *lov,
                        continue;
                }
 
-               tgt_bytes = lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx]);
-               stripe_maxbytes = min_t(loff_t, stripe_maxbytes, tgt_bytes);
+               lov_bytes = lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx]);
+               if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
+                       min_stripe_maxbytes = lov_bytes;
        }
 
-       if (stripe_maxbytes == LLONG_MAX)
-               stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
+       if (min_stripe_maxbytes == 0)
+               min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
+
+       stripe_count = lsm->lsm_stripe_count ?: lov->desc.ld_tgt_count;
+       lov_bytes = min_stripe_maxbytes * stripe_count;
 
-       if (!lsm->lsm_stripe_count)
-               lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
+       if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
+               lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
        else
-               lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
+               lsm->lsm_maxbytes = lov_bytes;
 
        return 0;
 }