The patch titled
dm io: delay dec_count
has been added to the -mm tree. Its filename is
dm-io-delay-dec_count.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: dm io: delay dec_count
From: Heinz Mauelshagen <hjm@xxxxxxxxxx>
Delay decrementing the 'struct io' reference count until after the bio has
been freed so that a bio destructor function may reference it. Required by a
later patch.
Signed-off-by: Heinz Mauelshagen <hjm@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Cc: Milan Broz <mbroz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-io.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff -puN drivers/md/dm-io.c~dm-io-delay-dec_count drivers/md/dm-io.c
--- a/drivers/md/dm-io.c~dm-io-delay-dec_count
+++ a/drivers/md/dm-io.c
@@ -126,7 +126,8 @@ static void dec_count(struct io *io, uns
static int endio(struct bio *bio, unsigned int done, int error)
{
- struct io *io = (struct io *) bio->bi_private;
+ struct io *io;
+ unsigned region;
/* keep going until we've finished */
if (bio->bi_size)
@@ -135,10 +136,17 @@ static int endio(struct bio *bio, unsign
if (error && bio_data_dir(bio) == READ)
zero_fill_bio(bio);
- dec_count(io, bio_get_region(bio), error);
+ /*
+ * The bio destructor in bio_put() may use the io object.
+ */
+ io = bio->bi_private;
+ region = bio_get_region(bio);
+
bio->bi_max_vecs++;
bio_put(bio);
+ dec_count(io, region, error);
+
return 0;
}
_
Patches currently in -mm which might be from hjm@xxxxxxxxxx are
dm-io-delay-dec_count.patch
dm-io-prepare-for-new-interface.patch
dm-io-new-interface.patch
dm-kcopyd-update-dm-io-interface.patch
dm-exception-store-update-dm-io-interface.patch
dm-bio-list-helpers.patch
-
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