ore: fix BUG_ON, too few sgs when reading

When reading RAID5 files, in rare cases, we calculated too
few sg segments. There should be two extra for the beginning
and end partial units.

Also "too few sg segments" should not be a BUG_ON there is
all the mechanics in place to handle it, as a short read.
So just return -ENOMEM and the rest of the code will gracefully
split the IO.

[Bug in 3.2.0 Kernel]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

2 files changed, 6 insertions, 2 deletions

diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 894f3e192e6b..49cf230554a2 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -266,7 +266,7 @@ int  ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc,
 
                         /* first/last seg is split */
                         num_raid_units += layout->group_width;
-                        sgs_per_dev = div_u64(num_raid_units, data_devs);
+                        sgs_per_dev = div_u64(num_raid_units, data_devs) + 2;
                 } else {
                         /* For Writes add parity pages array. */
                         max_par_pages = num_raid_units * pages_in_unit *
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 29c47e5c4a86..414a2dfd9500 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -551,7 +551,11 @@ int _ore_add_parity_unit(struct ore_io_state *ios,
                             unsigned cur_len)
 {
         if (ios->reading) {
-                BUG_ON(per_dev->cur_sg >= ios->sgs_per_dev);
+                if (per_dev->cur_sg >= ios->sgs_per_dev) {
+                        ORE_DBGMSG("cur_sg(%d) >= sgs_per_dev(%d)\n" ,
+                                per_dev->cur_sg, ios->sgs_per_dev);
+                        return -ENOMEM;
+                }
                 _ore_add_sg_seg(per_dev, cur_len, true);
         } else {
                 struct __stripe_pages_2d *sp2d = ios->sp2d;