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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/ore_raid.c
parentffefb8eaa367e8a5c14f779233d9da1fbc23d164 (diff)
downloadlinux-361aba569f55dd159b850489a3538253afbb3973.tar.bz2
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/ore_raid.c')
-rw-r--r--fs/exofs/ore_raid.c6
1 files changed, 5 insertions, 1 deletions
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;