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Linux/fs/nfs/blocklayout/blocklayoutdm.c

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  1 /*
  2  *  linux/fs/nfs/blocklayout/blocklayoutdm.c
  3  *
  4  *  Module for the NFSv4.1 pNFS block layout driver.
  5  *
  6  *  Copyright (c) 2007 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Fred Isaman <iisaman@umich.edu>
 10  *  Andy Adamson <andros@citi.umich.edu>
 11  *
 12  * permission is granted to use, copy, create derivative works and
 13  * redistribute this software and such derivative works for any purpose,
 14  * so long as the name of the university of michigan is not used in
 15  * any advertising or publicity pertaining to the use or distribution
 16  * of this software without specific, written prior authorization.  if
 17  * the above copyright notice or any other identification of the
 18  * university of michigan is included in any copy of any portion of
 19  * this software, then the disclaimer below must also be included.
 20  *
 21  * this software is provided as is, without representation from the
 22  * university of michigan as to its fitness for any purpose, and without
 23  * warranty by the university of michigan of any kind, either express
 24  * or implied, including without limitation the implied warranties of
 25  * merchantability and fitness for a particular purpose.  the regents
 26  * of the university of michigan shall not be liable for any damages,
 27  * including special, indirect, incidental, or consequential damages,
 28  * with respect to any claim arising out or in connection with the use
 29  * of the software, even if it has been or is hereafter advised of the
 30  * possibility of such damages.
 31  */
 32 
 33 #include <linux/genhd.h> /* gendisk - used in a dprintk*/
 34 #include <linux/sched.h>
 35 #include <linux/hash.h>
 36 
 37 #include "blocklayout.h"
 38 
 39 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
 40 
 41 static void dev_remove(struct net *net, dev_t dev)
 42 {
 43         struct bl_pipe_msg bl_pipe_msg;
 44         struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
 45         struct bl_dev_msg bl_umount_request;
 46         struct bl_msg_hdr bl_msg = {
 47                 .type = BL_DEVICE_UMOUNT,
 48                 .totallen = sizeof(bl_umount_request),
 49         };
 50         uint8_t *dataptr;
 51         DECLARE_WAITQUEUE(wq, current);
 52         struct nfs_net *nn = net_generic(net, nfs_net_id);
 53 
 54         dprintk("Entering %s\n", __func__);
 55 
 56         bl_pipe_msg.bl_wq = &nn->bl_wq;
 57         memset(msg, 0, sizeof(*msg));
 58         msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);
 59         if (!msg->data)
 60                 goto out;
 61 
 62         memset(&bl_umount_request, 0, sizeof(bl_umount_request));
 63         bl_umount_request.major = MAJOR(dev);
 64         bl_umount_request.minor = MINOR(dev);
 65 
 66         memcpy(msg->data, &bl_msg, sizeof(bl_msg));
 67         dataptr = (uint8_t *) msg->data;
 68         memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
 69         msg->len = sizeof(bl_msg) + bl_msg.totallen;
 70 
 71         add_wait_queue(&nn->bl_wq, &wq);
 72         if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
 73                 remove_wait_queue(&nn->bl_wq, &wq);
 74                 goto out;
 75         }
 76 
 77         set_current_state(TASK_UNINTERRUPTIBLE);
 78         schedule();
 79         __set_current_state(TASK_RUNNING);
 80         remove_wait_queue(&nn->bl_wq, &wq);
 81 
 82 out:
 83         kfree(msg->data);
 84 }
 85 
 86 /*
 87  * Release meta device
 88  */
 89 static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
 90 {
 91         int rv;
 92 
 93         dprintk("%s Releasing\n", __func__);
 94         rv = nfs4_blkdev_put(bdev->bm_mdev);
 95         if (rv)
 96                 printk(KERN_ERR "NFS: %s nfs4_blkdev_put returns %d\n",
 97                                 __func__, rv);
 98 
 99         dev_remove(bdev->net, bdev->bm_mdev->bd_dev);
100 }
101 
102 void bl_free_block_dev(struct pnfs_block_dev *bdev)
103 {
104         if (bdev) {
105                 if (bdev->bm_mdev) {
106                         dprintk("%s Removing DM device: %d:%d\n",
107                                 __func__,
108                                 MAJOR(bdev->bm_mdev->bd_dev),
109                                 MINOR(bdev->bm_mdev->bd_dev));
110                         nfs4_blk_metadev_release(bdev);
111                 }
112                 kfree(bdev);
113         }
114 }
115 

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