- 01 Dec, 2016 3 commits
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Chaitanya Kulkarni authored
This adds a new block layer operation to zero out a range of LBAs. This allows to implement zeroing for devices that don't use either discard with a predictable zero pattern or WRITE SAME of zeroes. The prominent example of that is NVMe with the Write Zeroes command, but in the future, this should also help with improving the way zeroing discards work. For this operation, suitable entry is exported in sysfs which indicate the number of maximum bytes allowed in one write zeroes operation by the device. Signed-off-by:
Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com>
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Chaitanya Kulkarni authored
Similar to __blkdev_issue_discard this variant allows submitting the final bio asynchronously and chaining multiple ranges into a single completion. Signed-off-by:
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Damien Le Moal authored
Both blkdev_report_zones and blkdev_reset_zones can operate on a partition of a zoned block device. However, the first and last zones reported for a partition make sense only if the partition start sector and size are aligned on the device zone size. The same applies for zone reset. Resetting the first or the last zone of a partition straddling zones may impact neighboring partitions. Finally, if a partition start sector is not at the beginning of a sequential zone, it will be impossible to write to the first sectors of the partition on a host-managed device. Avoid all these problems and incoherencies by ignoring partitions that are not zone aligned. Note: Even with CONFIG_BLK_DEV_ZONED disabled, bdev_is_zoned() will report the correct disk zoning type (host-aware, host-managed or none) but bdev_zone_size() will always return 0 for zoned block devices (i.e. the zone size is unknown). So test this as a way to ensure that a zoned block device is being handled as such. As a result, for a host-aware devices, unaligned zone partitions will be accepted with CONFIG_BLK_DEV_ZONED disabled. That is, the disk will be treated as a regular block device (as it should). If zoned block device support is enabled, only aligned partitions will be accepted. Signed-off-by:
Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by:
Hannes Reinecke <hare@suse.com> Signed-off-by:
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- 29 Nov, 2016 24 commits
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Javier González authored
Since targets are given a virtual target device, it is necessary to translate all communication between targets and the backend device. Implement the translation layer for get/set bad block table. Signed-off-by:
Javier González <javier@cnexlabs.com> Signed-off-by:
Matias Bjørling <m@bjorling.me> Signed-off-by:
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Javier González authored
On target-specific operations pass on nvm_tgt_dev instead of the generic nvm device. Signed-off-by:
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Javier González authored
Target devices do not have access to the device driver operations. Introduce a helper function that exposes the max. number of physical sectors supported by the underlying device. Signed-off-by:
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Javier González authored
Avoid calling media manager and device-specific operations directly from rrpc. Create helper functions on lightnvm's core instead. Signed-off-by:
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Javier González authored
In order to naturally support multi-target instances on an Open-Channel SSD, targets should own the LUNs they get blocks from and manage provisioning internally. This is done in several steps. Since targets own the LUNs the are instantiated on top of and manage the free block list internally, there is no need for a LUN abstraction in the media manager. LUNs are intrinsically managed as in the physical layout (ch:0,lun:0, ..., ch:0,lun:n, ch:1,lun:0, ch:1,lun:n, ..., ch:m,lun:0, ch:m,lun:n) and given to the targets based on the target creation ioctl. This simplifies LUN management and clears the path for a partition manager to sit directly underneath LightNVM targets. Signed-off-by:
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Javier González authored
In order to naturally support multi-target instances on an Open-Channel SSD, targets should own the LUNs they get blocks from and manage provisioning internally. This is done in several steps. A part of this transformation is that targets manage their blocks internally. This patch eliminates the nvm_block abstraction and moves block management to the target logic. The rrpc target is transformed. Signed-off-by:
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Javier González authored
Since LUNs are managed internally on targets, the media manager has no access to the free LUN lists. Thus, debug functions that show LUN information on the device should not be implemented on the media manager, but rather on the target in itself. Signed-off-by:
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Javier González authored
Since LUNs are managed internally on the target, there is no need for the media manager to implement a get_lun operation. Signed-off-by:
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Javier González authored
In order to naturally support multi-target instances on an Open-Channel SSD, targets should own the LUNs they get blocks from and manage provisioning internally. This is done in several steps. This patch moves the block provisioning inside of the target and removes the get/put block interface from the media manager. Signed-off-by:
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Javier González authored
LUNs are exclusively owned by targets implementing a block device FTL. Doing this reservation requires at the moment a 2-way callback gennvm <-> target. The reason behind this is that LUNs were not assumed to always be exclusively owned by targets. However, this design decision goes against I/O determinism QoS (two targets would mix I/O on the same parallel unit in the device). This patch makes LUN reservation as part of the target creation on the media manager. This makes that LUNs are always exclusively owned by the target instantiated on top of them. LUN stripping and/or sharing should be implemented on the target itself or the layers on top. Signed-off-by:
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Javier González authored
The gen_lun abstraction in the generic media manager was conceived on the assumption that a single target would instantiated on top of it. This has complicated target design to implement multi-instances. Remove this abstraction and move its logic to nvm_lun, which manages physical lun geometry and operations. Signed-off-by:
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Javier González authored
There is a constant to refer to free blocks. Use it when marking bad blocks instead of using a constant value Signed-off-by:
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Javier González authored
Before vectored I/Os were supported on rrpc, the physical address was stored as part of the nvm_rqd request. This variable become obsolete when the ppa_list was introduced. Cleanup this variable. Signed-off-by:
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Javier González authored
Targets are assumed to used the same generic ppa format, where the address is partitioned on ch:lun:block:pg:pl:sec. Thus, make the function in charge of transforming the ppa address from a linear format to the generic one available to all targets. This function will be needed by the media manager in order to do target mapping translations when targets are divided on different physical partitions. Signed-off-by:
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Javier González authored
Cleanup definition leftovers from old gennvm interface Signed-off-by:
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Javier González authored
LightNVM used to be managed and configured through sysfs. Since the introduction of management ioctls this interface is redundant and outdated. Get rid of it. Signed-off-by:
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Javier González authored
rrpc cannot handle bios of size > 256kb due to NVMe using a 64 bit bitmap to signal I/O completion. If a larger bio comes, split it explicitly. Signed-off-by:
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Javier González authored
Add ECC error codes to enable the appropriate handling in the target. Signed-off-by:
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Javier González authored
Bad blocks should be managed by block owners. This would be either targets for data blocks or sysblk for system blocks. In order to support this, export two functions: One to mark a block as an specific type (e.g., bad block) and another to update the bad block table on the device. Move bad block management to rrpc. Signed-off-by:
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Javier González authored
Device blocks should be marked by the device and considered as bad blocks by the media manager. Thus, do not make assumptions on which blocks are going to be used by the device. In doing so we might lose valid blocks from the free list. Signed-off-by:
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Javier González authored
Erases might be subject to host hints. An example is multi-plane programming to erase blocks in parallel. Enable targets to specify this hint. Signed-off-by:
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Matias Bjørling authored
Previously, LBA read and write were not supported in the lightnvm specification. Now that it supports it, lets use the traditional NVMe gendisk, and attach the lightnvm sysfs geometry export. Signed-off-by:
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Matias Bjørling authored
When struct nvme_request was introduced, the nvme_nvm_submit_io was converted to the new interface. The interface moves nvme_nvm_command data structure into the struct request pdu. On io completion, rq->cmd is freed, which should have been the dereferenced pdu nvme_request->cmd. Fixes: d49187e9 "nvme: introduce struct nvme_request" Signed-off-by:
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Gabriel Krisman Bertazi authored
After commit 287922eb ("block: defer timeouts to a workqueue"), deleting the timeout work after freezing the queue shouldn't be necessary, since the synchronization is already enforced by the acquisition of a q_usage_counter reference in blk_mq_timeout_work. Signed-off-by:
Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com> Reviewed-by:
Ming Lei <ming.lei@canonical.com> Signed-off-by:
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- 28 Nov, 2016 3 commits
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Jens Axboe authored
Currently there's no way to enable wbt if it's not enabled in the kernel config by default for a device. Allow a write to the 'wbt_lat_usec' queue sysfs file to enable wbt. This is useful for both the kernel config case, but also if the device is CFQ managed and it was turned off by default. Signed-off-by: -
Jens Axboe authored
Make it clear that we are disabling wbt for the specified queued, if it was enabled by default. This is in preparation for allowing users to re-enable wbt, and not have it disabled automatically again. Signed-off-by: -
Jens Axboe authored
Allow a write of '-1' to reset the default latency target for a given device. This removes knowledge of the different default settings for rotational vs non-rotational from user space. Signed-off-by:
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- 23 Nov, 2016 1 commit
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Jens Axboe authored
Multiple paths don't set it properly, ensure that we do. Fixes: 9561a7ad ("nbd: add multi-connection support") Signed-off-by:
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- 22 Nov, 2016 9 commits
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Jens Axboe authored
Bit #7 is already used, move to bit #8 which is the first unused one. Fixes: 9561a7ad ("nbd: add multi-connection support") Signed-off-by:
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Josef Bacik authored
NBD can become contended on its single connection. We have to serialize all writes and we can only process one read response at a time. Fix this by allowing userspace to provide multiple connections to a single nbd device. This coupled with block-mq drastically increases performance in multi-process cases. Thanks, Signed-off-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
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Tejun Heo authored
blkcg allocates some per-cgroup data structures with GFP_NOWAIT and when that fails falls back to operations which aren't specific to the cgroup. Occassional failures are expected under pressure and falling back to non-cgroup operation is the right thing to do. Unfortunately, I forgot to add __GFP_NOWARN to these allocations and these expected failures end up creating a lot of noise. Add __GFP_NOWARN. Signed-off-by:
Tejun Heo <tj@kernel.org> Reported-by:
Marc MERLIN <marc@merlins.org> Reported-by:
Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
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Ming Lei authored
The check on bio->bi_vcnt doesn't make sense in erase_end_io(). Reviewed-by:
Ming Lei <tom.leiming@gmail.com> Signed-off-by:
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Ming Lei authored
Also code gets simplified a bit. Reviewed-by:
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Ming Lei authored
Also this patch simplify the code a bit. Reviewed-by:
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Ming Lei authored
Always bio_add_page() is the standard and preferred way to do the task. Reviewed-by:
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Ming Lei authored
Instead we use standard iterator way to do that. Signed-off-by:
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Ming Lei authored
When the bio is full, bio_add_pc_page() will return zero, so use this information tell when the bio is full. Also replace access to .bi_vcnt for pr_debug() with bio_segments(). Reviewed-by:
Sagi Grimberg <sagi@grimberg.me> Signed-off-by:
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