/* * linux/fs/nfs/blocklayout/blocklayoutdm.c * * Module for the NFSv4.1 pNFS block layout driver. * * Copyright (c) 2007 The Regents of the University of Michigan. * All rights reserved. * * Fred Isaman <iisaman@umich.edu> * Andy Adamson <andros@citi.umich.edu> * * permission is granted to use, copy, create derivative works and * redistribute this software and such derivative works for any purpose, * so long as the name of the university of michigan is not used in * any advertising or publicity pertaining to the use or distribution * of this software without specific, written prior authorization. if * the above copyright notice or any other identification of the * university of michigan is included in any copy of any portion of * this software, then the disclaimer below must also be included. * * this software is provided as is, without representation from the * university of michigan as to its fitness for any purpose, and without * warranty by the university of michigan of any kind, either express * or implied, including without limitation the implied warranties of * merchantability and fitness for a particular purpose. the regents * of the university of michigan shall not be liable for any damages, * including special, indirect, incidental, or consequential damages, * with respect to any claim arising out or in connection with the use * of the software, even if it has been or is hereafter advised of the * possibility of such damages. */ #include <linux/genhd.h> /* gendisk - used in a dprintk*/ #include <linux/sched.h> #include <linux/hash.h> #include "blocklayout.h" #define NFSDBG_FACILITY NFSDBG_PNFS_LD static void dev_remove(struct net *net, dev_t dev) { struct bl_pipe_msg bl_pipe_msg; struct rpc_pipe_msg *msg = &bl_pipe_msg.msg; struct bl_dev_msg bl_umount_request; struct bl_msg_hdr bl_msg = { .type = BL_DEVICE_UMOUNT, .totallen = sizeof(bl_umount_request), }; uint8_t *dataptr; DECLARE_WAITQUEUE(wq, current); struct nfs_net *nn = net_generic(net, nfs_net_id); dprintk("Entering %s\n", __func__); bl_pipe_msg.bl_wq = &nn->bl_wq; memset(msg, 0, sizeof(*msg)); msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS); if (!msg->data) goto out; memset(&bl_umount_request, 0, sizeof(bl_umount_request)); bl_umount_request.major = MAJOR(dev); bl_umount_request.minor = MINOR(dev); memcpy(msg->data, &bl_msg, sizeof(bl_msg)); dataptr = (uint8_t *) msg->data; memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request)); msg->len = sizeof(bl_msg) + bl_msg.totallen; add_wait_queue(&nn->bl_wq, &wq); if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) { remove_wait_queue(&nn->bl_wq, &wq); goto out; } set_current_state(TASK_UNINTERRUPTIBLE); schedule(); __set_current_state(TASK_RUNNING); remove_wait_queue(&nn->bl_wq, &wq); out: kfree(msg->data); } /* * Release meta device */ static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev) { int rv; dprintk("%s Releasing\n", __func__); rv = nfs4_blkdev_put(bdev->bm_mdev); if (rv) printk(KERN_ERR "NFS: %s nfs4_blkdev_put returns %d\n", __func__, rv); dev_remove(bdev->net, bdev->bm_mdev->bd_dev); } void bl_free_block_dev(struct pnfs_block_dev *bdev) { if (bdev) { if (bdev->bm_mdev) { dprintk("%s Removing DM device: %d:%d\n", __func__, MAJOR(bdev->bm_mdev->bd_dev), MINOR(bdev->bm_mdev->bd_dev)); nfs4_blk_metadev_release(bdev); } kfree(bdev); } }