mirror of https://github.com/torvalds/linux.git
2ebc8d600f
DRBD requires stable pages because it may read the same bio data
multiple times for local disk I/O and network transmission, and in
some cases for calculating checksums.
The BLK_FEAT_STABLE_WRITES flag is set when the device is first
created, but blk_set_stacking_limits() clears it whenever a
backing device is attached. In some cases the flag may be
inherited from the backing device, but we want it to be enabled
at all times.
Unconditionally re-enable BLK_FEAT_STABLE_WRITES in
drbd_reconsider_queue_parameters() after the queue parameter
negotiations.
Also, document why we want this flag enabled in the first place.
Fixes:
|
||
|---|---|---|
| .. | ||
| aoe | ||
| drbd | ||
| mtip32xx | ||
| null_blk | ||
| rnbd | ||
| rnull | ||
| xen-blkback | ||
| zram | ||
| Kconfig | ||
| Makefile | ||
| amiflop.c | ||
| ataflop.c | ||
| brd.c | ||
| floppy.c | ||
| loop.c | ||
| n64cart.c | ||
| nbd.c | ||
| ps3disk.c | ||
| ps3vram.c | ||
| rbd.c | ||
| rbd_types.h | ||
| sunvdc.c | ||
| swim.c | ||
| swim3.c | ||
| swim_asm.S | ||
| ublk_drv.c | ||
| virtio_blk.c | ||
| xen-blkfront.c | ||
| z2ram.c | ||
| zloop.c | ||