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block: remove the discard_zeroes_data flag

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Now that we use the proper REQ_OP_WRITE_ZEROES operation everywhere we can
kill this hack.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2017-04-05 19:21:23 +02:00
committed by Jens Axboe
parent 45c21793a6
commit 48920ff2a5
23 changed files with 27 additions and 124 deletions
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10
Documentation/ABI/testing/sysfs-block
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@@ -213,14 +213,8 @@ What: /sys/block/<disk>/queue/discard_zeroes_data
Date: May 2011
Contact: Martin K. Petersen <martin.petersen@oracle.com>
Description:
Devices that support discard functionality may return
stale or random data when a previously discarded block
is read back. This can cause problems if the filesystem
expects discarded blocks to be explicitly cleared. If a
device reports that it deterministically returns zeroes
when a discarded area is read the discard_zeroes_data
parameter will be set to one. Otherwise it will be 0 and
the result of reading a discarded area is undefined.
Will always return 0. Don't rely on any specific behavior
for discards, and don't read this file.
What: /sys/block/<disk>/queue/write_same_max_bytes
Date: January 2012