drivers/block/rnbd/rnbd-srv-dev.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * RDMA Network Block Driver
   4  *
   5  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
   6  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
   7  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
   8  */
   9 #ifndef RNBD_SRV_DEV_H
  10 #define RNBD_SRV_DEV_H
  11
  12 #include <linux/fs.h>
  13 #include "rnbd-proto.h"
  14
  15 struct rnbd_dev {
  16         struct block_device     *bdev;
  17         struct bio_set          *ibd_bio_set;
  18         fmode_t                 blk_open_flags;
  19         char                    name[BDEVNAME_SIZE];
  20 };
  21
  22 struct rnbd_dev_blk_io {
  23         struct rnbd_dev *dev;
  24         void             *priv;
  25         /* have to be last member for front_pad usage of bioset_init */
  26         struct bio      bio;
  27 };
  28
  29 /**
  30  * rnbd_dev_open() - Open a device
  31  * @flags:      open flags
  32  * @bs:         bio_set to use during block io,
  33  */
  34 struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
  35                                struct bio_set *bs);
  36
  37 /**
  38  * rnbd_dev_close() - Close a device
  39  */
  40 void rnbd_dev_close(struct rnbd_dev *dev);
  41
  42 void rnbd_endio(void *priv, int error);
  43
  44 void rnbd_dev_bi_end_io(struct bio *bio);
  45
  46 struct bio *rnbd_bio_map_kern(void *data, struct bio_set *bs,
  47                               unsigned int len, gfp_t gfp_mask);
  48
  49 static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
  50 {
  51         return queue_max_segments(bdev_get_queue(dev->bdev));
  52 }
  53
  54 static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
  55 {
  56         return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
  57 }
  58
  59 static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
  60 {
  61         return blk_queue_secure_erase(bdev_get_queue(dev->bdev));
  62 }
  63
  64 static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
  65 {
  66         if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
  67                 return 0;
  68
  69         return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
  70                                          REQ_OP_DISCARD);
  71 }
  72
  73 static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
  74 {
  75         return bdev_get_queue(dev->bdev)->limits.discard_granularity;
  76 }
  77
  78 static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
  79 {
  80         return bdev_get_queue(dev->bdev)->limits.discard_alignment;
  81 }
  82
  83 #endif /* RNBD_SRV_DEV_H */