Mike Snitzer ff26956875
brd: remove support for BLKFLSBUF ...
Discontinue having the brd driver destructively free all pages in the
ramdisk in response to the BLKFLSBUF ioctl. Doing so allows a BLKFLSBUF
ioctl issued to a logical partition to destroy pages of the parent brd
device (and all other partitions of that brd device).
This change breaks compatibility - but in this case the compatibility
breaks more than it helps.
Reported-by: Mikulas Patocka <mpatocka@redhat.com >
Suggested-by: Christoph Hellwig <hch@infradead.org >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
Signed-off-by: Jens Axboe <axboe@fb.com >
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ff26956875