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authorBoaz Harrosh <bharrosh@panasas.com>2011-12-28 19:14:23 +0200
committerBoaz Harrosh <bharrosh@panasas.com>2012-01-06 16:49:07 +0200
commit361aba569f55dd159b850489a3538253afbb3973 (patch)
treee5a71f53908a67d8873f1a58ae8d83c64b2fdd7f /fs/exofs
parentffefb8eaa367e8a5c14f779233d9da1fbc23d164 (diff)
downloadlinux-361aba569f55dd159b850489a3538253afbb3973.tar.gz
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>
Diffstat (limited to 'fs/exofs')
-rw-r--r--fs/exofs/ore.c2
-rw-r--r--fs/exofs/ore_raid.c6
2 files changed, 6 insertions, 2 deletions
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 894f3e192e6..49cf230554a 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 29c47e5c4a8..414a2dfd950 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;