kernel/linux.git/drivers/md/raid0.c, branch v4.14.85

md: remove special meaning of ->quiesce(.., 2)

2018-07-08T13:30:50+00:00

commit b03e0ccb5ab9df3efbe51c87843a1ffbecbafa1f upstream. The '2' argument means "wake up anything that is waiting". This is an inelegant part of the design and was added to help support management of suspend_lo/suspend_hi setting. Now that suspend_lo/hi is managed in mddev_suspend/resume, that need is gone. These is still a couple of places where we call 'quiesce' with an argument of '2', but they can safely be changed to call ->quiesce(.., 1); ->quiesce(.., 0) which achieve the same result at the small cost of pausing IO briefly. This removes a small "optimization" from suspend_{hi,lo}_store, but it isn't clear that optimization served a useful purpose. The code now is a lot clearer. Suggested-by: Shaohua Li Signed-off-by: NeilBrown Signed-off-by: Shaohua Li Signed-off-by: Jack Wang Signed-off-by: Greg Kroah-Hartman

Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md

2017-09-07T19:41:48+00:00

Pull MD updates from Shaohua Li: "This update mainly fixes bugs: - Make raid5 ppl support several ppl from Pawel - Several raid5-cache bug fixes from Song - Bitmap fixes from Neil and Me - One raid1/10 regression fix since 4.12 from Me - Other small fixes and cleanup" * tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: md/bitmap: disable bitmap_resize for file-backed bitmaps. raid5-ppl: Recovery support for multiple partial parity logs md: Runtime support for multiple ppls md/raid0: attach correct cgroup info in bio lib/raid6: align AVX512 constants to 512 bits, not bytes raid5: remove raid5_build_block md/r5cache: call mddev_lock/unlock() in r5c_journal_mode_show md: replace seq_release_private with seq_release md: notify about new spare disk in the container md/raid1/10: reset bio allocated from mempool md/raid5: release/flush io in raid5_do_work() md/bitmap: copy correct data for bitmap super

md: Runtime support for multiple ppls

2017-08-28T14:45:48+00:00

Increase PPL area to 1MB and use it as circular buffer to store PPL. The entry with highest generation number is the latest one. If PPL to be written is larger then space left in a buffer, rewind the buffer to the start (don't wrap it). Signed-off-by: Pawel Baldysiak Signed-off-by: Artur Paszkiewicz Signed-off-by: Shaohua Li

md/raid0: attach correct cgroup info in bio

2017-08-25T17:21:48+00:00

The discard bio doesn't attach the original bio cgroup info. Normal bio is cloned, so is fine. Signed-off-by: Shaohua Li

block: replace bi_bdev with a gendisk pointer and partitions index

2017-08-23T18:49:55+00:00

This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

md: fix deadlock between mddev_suspend() and md_write_start()

2017-06-13T17:18:01+00:00

If mddev_suspend() races with md_write_start() we can deadlock with mddev_suspend() waiting for the request that is currently in md_write_start() to complete the ->make_request() call, and md_write_start() waiting for the metadata to be updated to mark the array as 'dirty'. As metadata updates done by md_check_recovery() only happen then the mddev_lock() can be claimed, and as mddev_suspend() is often called with the lock held, these threads wait indefinitely for each other. We fix this by having md_write_start() abort if mddev_suspend() is happening, and ->make_request() aborts if md_write_start() aborted. md_make_request() can detect this abort, decrease the ->active_io count, and wait for mddev_suspend(). Reported-by: Nix Fix: 68866e425be2(MD: no sync IO while suspended) Cc: stable@vger.kernel.org Signed-off-by: NeilBrown Signed-off-by: Shaohua Li

md/md0: optimize raid0 discard handling

2017-05-09T04:18:03+00:00

There are complaints that raid0 discard handling is slow. Currently we divide discard request into chunks and dispatch to underlayer disks. The block layer will do merge to form big requests. This causes a lot of request split/merge and uses significant CPU time. A simple idea is to calculate the range for each raid disk for an IO request and send a discard request to raid disks, which will avoid the split/merge completely. Previously Coly tried the approach, but the implementation was too complex because of raid0 zones. This patch always split bio in zone boundary and handle bio within one zone. It simplifies the implementation a lot. Reviewed-by: NeilBrown Acked-by: Coly Li Signed-off-by: Shaohua Li

Merge branch 'md-next' into md-linus

2017-05-01T21:09:21+00:00

md/raid0: fix up bio splitting.

2017-04-11T17:18:09+00:00

raid0_make_request() should use a private bio_set rather than the shared fs_bio_set, which is only meant for filesystems to use. raid0_make_request() shouldn't loop around using the bio_set multiple times as that can deadlock. So use mddev->bio_set and pass the tail to generic_make_request() instead of looping on it. Signed-off-by: NeilBrown Signed-off-by: Shaohua Li

md: support REQ_OP_WRITE_ZEROES

2017-04-08T17:25:38+00:00

Copy & paste from the REQ_OP_WRITE_SAME code. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe