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| author | Heinz Mauelshagen <hjm@redhat.com> | 2007-05-09 02:33:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:47 -0700 |
| commit | c897feb3dcf3c3300849056ee82b01df7bf66d3c (patch) | |
| tree | 29d82a62375d7a6394ba39e11926a695e6691de0 | |
| parent | a8e6afa2363de7ee0dea1a3297f6236f421c2dd4 (diff) | |
| download | linux-c897feb3dcf3c3300849056ee82b01df7bf66d3c.tar.gz | |
dm io: delay dec_count
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@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: Milan Broz <mbroz@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/md/dm-io.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 8bdc8a87b249..4d19c45158b4 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -126,7 +126,8 @@ static void dec_count(struct io *io, unsigned int region, int error) 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, unsigned int done, int error) 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; } |