dm-accumulate-barrier_error.patch
Change md->barrier_error so that it can accumulate more errors
(the first one is reported).
With the following patches, more errors could happen.
Return the first error to the caller.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
Index: linux-2.6.30-rc2-devel/drivers/md/dm.c
===================================================================
--- linux-2.6.30-rc2-devel.orig/drivers/md/dm.c 2009-04-15 16:32:10.000000000 +0200
+++ linux-2.6.30-rc2-devel/drivers/md/dm.c 2009-04-15 16:35:23.000000000 +0200
@@ -565,7 +565,8 @@ static void dec_pending(struct dm_io *io
* a per-device variable for error reporting.
* Note that you can't touch the bio after end_io_acct
*/
- md->barrier_error = io_error;
+ if (!md->barrier_error)
+ md->barrier_error = io_error;
end_io_acct(io);
} else {
end_io_acct(io);
@@ -878,7 +879,8 @@ static void __split_and_process_bio(stru
if (!bio_barrier(bio))
bio_io_error(bio);
else
- md->barrier_error = -EIO;
+ if (!md->barrier_error)
+ md->barrier_error = -EIO;
return;
}
@@ -1450,16 +1452,15 @@ static void dm_flush(struct mapped_devic
static void process_barrier(struct mapped_device *md, struct bio *bio)
{
+ md->barrier_error = 0;
+
dm_flush(md);
- if (bio_empty_barrier(bio)) {
- bio_endio(bio, 0);
- return;
+ if (!bio_empty_barrier(bio)) {
+ __split_and_process_bio(md, bio);
+ dm_flush(md);
}
- __split_and_process_bio(md, bio);
- dm_flush(md);
-
if (md->barrier_error != DM_ENDIO_REQUEUE)
bio_endio(bio, md->barrier_error);
else {
--
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