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| author |   Martin K. Petersen <martin.petersen@oracle.com> | 2015-07-22 07:57:12 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2015-07-23 16:21:34 -0600 |
| commit | f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc (patch) | |
| tree | d2a92a8d8d03287c8b51df5dfae24d267e151e6b /fs | |
| parent | block: export bio_associate_*() and wbc_account_io() (diff) | |
| download | linux-dev-f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc.tar.xz linux-dev-f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc.zip | |
block: Do a full clone when splitting discard bios
This fixes a data corruption bug when using discard on top of MD linear,
raid0 and raid10 personalities.
Commit 20d0189b1012 "block: Introduce new bio_split()" permits sharing
the bio_vec between the two resulting bios. That is fine for read/write
requests where the bio_vec is immutable. For discards, however, we need
to be able to attach a payload and update the bio_vec so the page can
get mapped to a scatterlist entry. Therefore the bio_vec can not be
shared when splitting discards and we must do a full clone.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Seunguk Shin <seunguk.shin@samsung.com>
Tested-by: Seunguk Shin <seunguk.shin@samsung.com>
Cc: Seunguk Shin <seunguk.shin@samsung.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: <stable@vger.kernel.org> # v3.14+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions