linux/drivers/block/rnbd, branch v5.8

RDMA/rnbd: Fix compilation error when CONFIG_MODULES is disabled

2020-05-22T18:50:22Z

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 Suggested-by: Guoqing Jiang Signed-off-by: Danil Kipnis Acked-by: Randy Dunlap Signed-off-by: Jason Gunthorpe

block/rnbd: Fix an IS_ERR() vs NULL check in find_or_create_sess()

2020-05-22T14:51:36Z

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 Reviewed-by: Jack Wang Signed-off-by: Jason Gunthorpe

rnbd/rtrs: Pass max segment size from blk user to the rdma library

2020-05-19T23:43:26Z

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 Reported-by: Randy Dunlap Acked-by: Randy Dunlap # build-tested Signed-off-by: Jason Gunthorpe

block/rnbd: a bit of documentation

2020-05-17T21:57:17Z

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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: include client and server modules into kernel compilation

2020-05-17T21:57:17Z

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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: server: sysfs interface functions

2020-05-17T21:57:17Z

This is the sysfs interface to rnbd mapped devices on server side: /sys/class/rnbd-server/ctl/devices// |- block_dev | *** link pointing to the corresponding block device sysfs entry | |- sessions// | *** 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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: server: functionality for IO submitting to block dev

2020-05-17T21:57:17Z

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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: server: main functionality

2020-05-17T21:57:16Z

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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: server: private header with server structs and functions

2020-05-17T21:57:16Z

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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe

block/rnbd: client: sysfs interface functions

2020-05-17T21:57:16Z

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/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 Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche Acked-by: Jens Axboe Signed-off-by: Jason Gunthorpe