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2020-05-22RDMA/rnbd: Fix compilation error when CONFIG_MODULES is disabledDanil Kipnis1-4/+7
module_is_live function is only defined when CONFIG_MODULES is enabled. Use try_module_get instead to check whether the module is being removed. When module unload and manuall unmapping is happening in parallel, we can try removing the symlink twice: rnbd_client_exit vs. rnbd_clt_unmap_dev_store. This is probably not the best way to deal with this race in general, but for now this fixes the compilation issue when CONFIG_MODULES is disabled and has no functional impact. Regression tests passed. Fixes: 1eb54f8f5dd8 ("block/rnbd: client: sysfs interface functions") Link: https://lore.kernel.org/r/20200521185909.457245-1-danil.kipnis@cloud.ionos.com Reported-by: Randy Dunlap <rdunlap@infradead.org> Suggested-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2020-05-22block/rnbd: Fix an IS_ERR() vs NULL check in find_or_create_sess()Dan Carpenter1-5/+4
The alloc_sess() function returns error pointers, it never returns NULL. Fixes: f7a7a5c228d4 ("block/rnbd: client: main functionality") Link: https://lore.kernel.org/r/20200519120347.GD42765@mwanda Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Jack Wang <jinpu.wang@cloud.ionos.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2020-05-19rnbd/rtrs: Pass max segment size from blk user to the rdma libraryDanil Kipnis1-0/+1
When Block Device Layer is disabled, BLK_MAX_SEGMENT_SIZE is undefined. The rtrs is a transport library and should compile independently of the block layer. The desired max segment size should be passed down by the user. Introduce max_segment_size parameter for the rtrs_clt_open() call. Fixes: f7a7a5c228d4 ("block/rnbd: client: main functionality") Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality") Fixes: cb80329c9434 ("RDMA/rtrs: client: private header with client structs and functions") Fixes: b5c27cdb094e ("RDMA/rtrs: public interface header to establish RDMA connections") Link: https://lore.kernel.org/r/20200519111419.924170-1-danil.kipnis@cloud.ionos.com Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com> Reported-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2020-05-17block/rnbd: a bit of documentationJack Wang1-0/+92
README with description of major sysfs entries, sysfs documentation are moved to ABI dir as Bart suggested. Link: https://lore.kernel.org/r/20200511135131.27580-25-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>
2020-05-17block/rnbd: include client and server modules into kernel compilationJack Wang2-0/+43
Add rnbd Makefile, Kconfig and also corresponding lines into upper block layer files. Link: https://lore.kernel.org/r/20200511135131.27580-24-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>
2020-05-17block/rnbd: server: sysfs interface functionsJack Wang1-0/+215
This is the sysfs interface to rnbd mapped devices on server side: /sys/class/rnbd-server/ctl/devices/<device_name>/ |- block_dev | *** link pointing to the corresponding block device sysfs entry | |- sessions/<session-name>/ | *** sessions directory | |- read_only | *** is devices mapped as read only | |- mapping_path *** relative device path provided by the client during mapping Link: https://lore.kernel.org/r/20200511135131.27580-23-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>
2020-05-17block/rnbd: server: functionality for IO submitting to block devJack Wang2-0/+226
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>
2020-05-17block/rnbd: server: main functionalityJack Wang1-0/+844
This is main functionality of rnbd-server module, which handles RTRS events and rnbd protocol requests, like map (open) or unmap (close) device. Also server side is responsible for processing incoming IBTRS IO requests and forward them to local mapped devices. Link: https://lore.kernel.org/r/20200511135131.27580-21-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>
2020-05-17block/rnbd: server: private header with server structs and functionsJack Wang1-0/+78
This header describes main structs and functions used by rnbd-server module, namely structs for managing sessions from different clients and mapped (opened) devices. Link: https://lore.kernel.org/r/20200511135131.27580-20-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>
2020-05-17block/rnbd: client: sysfs interface functionsJack Wang1-0/+636
This is the sysfs interface to rnbd block devices on client side: /sys/class/rnbd-client/ctl/ |- map_device | *** maps remote device | |- devices/ *** all mapped devices /sys/block/rnbd<N>/rnbd/ |- unmap_device | *** unmaps device | |- state | *** device state | |- session | *** session name | |- mapping_path *** path of the dev that was mapped on server Link: https://lore.kernel.org/r/20200511135131.27580-19-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>
2020-05-17block/rnbd: client: main functionalityJack Wang1-0/+1729
This is main functionality of rnbd-client module, which provides interface to map remote device as local block device /dev/rnbd<N> and feeds RTRS with IO requests. Link: https://lore.kernel.org/r/20200511135131.27580-18-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>
2020-05-17block/rnbd: client: private header with client structs and functionsJack Wang1-0/+156
This header describes main structs and functions used by rnbd-client module, mainly for managing RNBD sessions and mapped block devices, creating and destroying sysfs entries. Link: https://lore.kernel.org/r/20200511135131.27580-17-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>
2020-05-17block/rnbd: private headers with rnbd protocol structs and helpersJack Wang3-0/+367
These are common private headers with rnbd protocol structures, logging, sysfs and other helper functions, which are used on both client and server sides. Link: https://lore.kernel.org/r/20200511135131.27580-16-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>
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