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ore: fix BUG_ON, too few sgs when reading

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commit 361aba569f upstream.

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.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Boaz Harrosh
2011-12-28 19:14:23 +02:00
committed by Greg Kroah-Hartman
parent 688485273b
commit 0889c17965
2 changed files with 6 additions and 2 deletions
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2
fs/exofs/ore.c
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@@ -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 *

6
fs/exofs/ore_raid.c
View File

@@ -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;