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This provides helper functions for IO submitting to block dev. Link: https://lore.kernel.org/r/20200511135131.27580-22-danil.kipnis@cloud.ionos.com Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com> Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* RDMA Network Block Driver
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*
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
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*/
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#ifndef RNBD_SRV_DEV_H
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#define RNBD_SRV_DEV_H
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#include <linux/fs.h>
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#include "rnbd-proto.h"
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struct rnbd_dev {
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struct block_device *bdev;
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struct bio_set *ibd_bio_set;
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fmode_t blk_open_flags;
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char name[BDEVNAME_SIZE];
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};
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struct rnbd_dev_blk_io {
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struct rnbd_dev *dev;
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void *priv;
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/* have to be last member for front_pad usage of bioset_init */
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struct bio bio;
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};
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/**
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* rnbd_dev_open() - Open a device
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* @flags: open flags
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* @bs: bio_set to use during block io,
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*/
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struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
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struct bio_set *bs);
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/**
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* rnbd_dev_close() - Close a device
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*/
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void rnbd_dev_close(struct rnbd_dev *dev);
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void rnbd_endio(void *priv, int error);
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static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
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{
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return queue_max_segments(bdev_get_queue(dev->bdev));
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}
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static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
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{
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return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
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}
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static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
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{
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return blk_queue_secure_erase(bdev_get_queue(dev->bdev));
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}
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static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
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{
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if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
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return 0;
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return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
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REQ_OP_DISCARD);
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}
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static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
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{
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return bdev_get_queue(dev->bdev)->limits.discard_granularity;
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}
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static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
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{
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return bdev_get_queue(dev->bdev)->limits.discard_alignment;
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}
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/**
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* rnbd_dev_submit_io() - Submit an I/O to the disk
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* @dev: device to that the I/O is submitted
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* @sector: address to read/write data to
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* @data: I/O data to write or buffer to read I/O date into
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* @len: length of @data
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* @bi_size: Amount of data that will be read/written
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* @prio: IO priority
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* @priv: private data passed to @io_fn
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*/
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int rnbd_dev_submit_io(struct rnbd_dev *dev, sector_t sector, void *data,
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size_t len, u32 bi_size, enum rnbd_io_flags flags,
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short prio, void *priv);
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#endif /* RNBD_SRV_DEV_H */
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