forked from luck/tmp_suning_uos_patched
427e970801
It is possible a bio request can not be submitted as a single NVMe IO command if the bio_vec is not mergeable with the NVMe PRP alignement constraints. This condition was handled by submitting an IO for the mergeable portion then submitting a follow on IO for the remaining data after the previous IO completes. The remainder to be sent was tracked by manipulating the bio->bi_idx and bio->bi_sector. This patch splits the request as many times as necessary and submits the bios together. Since submitting the bio may cause it to be requeued on split, nvme_resubmit_bios had to be modified to remove the wait queue when the bio list is empty prior to submitting the bio since a split would have added the wait queue a second time, corrupting the wait queue head task list. There are a few other benefits from doing this: it fixes a potential issue with the previous handling of a non-mergeable bio as the requeuing method could would use an unlocked nvme_queue if the callback isn't invoked on the queue's associated cpu; it will be possible to retry a failed bio if desired at some later time since it does not manipulate the original bio; the bio integrity extensions require the bio to be in its original condition for the checks to work correctly if we implement the end-to-end data protection in the future. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> |
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| .. | ||
| aoe | ||
| drbd | ||
| mtip32xx | ||
| paride | ||
| rsxx | ||
| xen-blkback | ||
| amiflop.c | ||
| ataflop.c | ||
| brd.c | ||
| cciss_cmd.h | ||
| cciss_scsi.c | ||
| cciss_scsi.h | ||
| cciss.c | ||
| cciss.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 | ||
| nvme-core.c | ||
| nvme-scsi.c | ||
| osdblk.c | ||
| pktcdvd.c | ||
| ps3disk.c | ||
| ps3vram.c | ||
| rbd_types.h | ||
| rbd.c | ||
| smart1,2.h | ||
| sunvdc.c | ||
| swim_asm.S | ||
| swim.c | ||
| swim3.c | ||
| sx8.c | ||
| umem.c | ||
| umem.h | ||
| virtio_blk.c | ||
| xen-blkfront.c | ||
| xsysace.c | ||
| z2ram.c | ||