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brd: implement discard support
authorKeith Busch <kbusch@kernel.org>
Mon, 29 Apr 2024 10:23:08 +0000 (03:23 -0700)
committerJens Axboe <axboe@kernel.dk>
Tue, 14 May 2024 03:47:51 +0000 (21:47 -0600)
commit9ead7efc6f3f2b46c4ec68209bca4888cfbd4c19
tree0d37dea37e26de6b60b6072a928cd5c6c33f8d1btree
parent25260555b118e71c64dfdb6786144f654fe1a27dcommit | diff
brd: implement discard support

The ramdisk memory utilization can only go up when data is written to
new pages. Implement discard to provide the possibility to reduce memory
usage for pages no longer in use. Aligned discards will free the
associated pages, if any, and determinisitically return zeroed data
until written again.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20240429102308.147627-1-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block/brd.c diff | blob | history
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