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https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/
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https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.49
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https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.4
commit 80c825f2facf71acf7e605f2ac555cf7fde14cc4
Author: Martin K. Petersen <[email protected]>
Date: Wed Jul 22 07:57:12 2015 -0400
block: Do a full clone when splitting discard bios
commit f3f5da624e0a891c34d8cd513c57f1d9b0c7dadc upstream.
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 <[email protected]>
Reported-by: Seunguk Shin <[email protected]>
Tested-by: Seunguk Shin <[email protected]>
Cc: Seunguk Shin <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Kent Overstreet <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>