block/rnbd/rnbd-srv-dev.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * RDMA Network Block Driver
0004  *
0005  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
0006  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
0007  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
0008  */
0009 #ifndef RNBD_SRV_DEV_H
0010 #define RNBD_SRV_DEV_H
0011
0012 #include <linux/fs.h>
0013 #include "rnbd-proto.h"
0014
0015 struct rnbd_dev {
0016     struct block_device *bdev;
0017     fmode_t         blk_open_flags;
0018 };
0019
0020 /**
0021  * rnbd_dev_open() - Open a device
0022  * @path:   path to open
0023  * @flags:  open flags
0024  */
0025 struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags);
0026
0027 /**
0028  * rnbd_dev_close() - Close a device
0029  */
0030 void rnbd_dev_close(struct rnbd_dev *dev);
0031
0032 void rnbd_endio(void *priv, int error);
0033
0034 static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
0035 {
0036     return queue_max_segments(bdev_get_queue(dev->bdev));
0037 }
0038
0039 static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
0040 {
0041     return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
0042 }
0043
0044 static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
0045 {
0046     return bdev_max_secure_erase_sectors(dev->bdev);
0047 }
0048
0049 static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
0050 {
0051     return bdev_max_discard_sectors(dev->bdev);
0052 }
0053
0054 static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
0055 {
0056     return bdev_get_queue(dev->bdev)->limits.discard_granularity;
0057 }
0058
0059 static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
0060 {
0061     return bdev_discard_alignment(dev->bdev);
0062 }
0063
0064 #endif /* RNBD_SRV_DEV_H */