mirror of
https://github.com/torvalds/linux
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b6dd1a8976
cherry-picked and adapted from drbd 9 devel branch DRBD requests (struct drbd_request) are already on the per resource transfer log list, and carry their epoch number. We do not need to additionally link them on other ring lists in other structs. The drbd sender thread can recognize itself when to send a P_BARRIER, by tracking the currently processed epoch, and how many writes have been processed for that epoch. If the epoch of the request to be processed does not match the currently processed epoch, any writes have been processed in it, a P_BARRIER for this last processed epoch is send out first. The new epoch then becomes the currently processed epoch. To not get stuck in drbd_al_begin_io() waiting for P_BARRIER_ACK, the sender thread also needs to handle the case when the current epoch was closed already, but no new requests are queued yet, and send out P_BARRIER as soon as possible. This is done by comparing the per resource "current transfer log epoch" (tconn->current_tle_nr) with the per connection "currently processed epoch number" (tconn->send.current_epoch_nr), while waiting for new requests to be processed in wait_for_work(). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> |
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| .. | ||
| aoe | ||
| drbd | ||
| paride | ||
| xen-blkback | ||
| amiflop.c | ||
| ataflop.c | ||
| brd.c | ||
| cciss.c | ||
| cciss.h | ||
| cciss_cmd.h | ||
| cciss_scsi.c | ||
| cciss_scsi.h | ||
| cpqarray.c | ||
| cpqarray.h | ||
| cryptoloop.c | ||
| DAC960.c | ||
| DAC960.h | ||
| floppy.c | ||
| hd.c | ||
| ida_cmd.h | ||
| ida_ioctl.h | ||
| Kconfig | ||
| loop.c | ||
| Makefile | ||
| mg_disk.c | ||
| nbd.c | ||
| osdblk.c | ||
| pktcdvd.c | ||
| ps3disk.c | ||
| ps3vram.c | ||
| rbd.c | ||
| rbd_types.h | ||
| smart1,2.h | ||
| sunvdc.c | ||
| swim.c | ||
| swim3.c | ||
| swim_asm.S | ||
| sx8.c | ||
| ub.c | ||
| umem.c | ||
| umem.h | ||
| viodasd.c | ||
| virtio_blk.c | ||
| xd.c | ||
| xd.h | ||
| xen-blkfront.c | ||
| xsysace.c | ||
| z2ram.c | ||