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5ffaf85541
This queue is used for sleeping in kernel and it have to be per-net since we don't want to wake any other waiters except in out network nemespace. BTW, move wq to per-net data is easy. But some way to handle upcall timeouts have to be provided. On message destroy in case of timeout, tasks, waiting for message to be delivered, should be awakened. Thus, some data required to located the right wait queue. Chosen solution replaces rpc_pipe_msg object with new introduced bl_pipe_msg object, containing rpc_pipe_msg and proper wq. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* linux/fs/nfs/blocklayout/blocklayoutdm.c
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*
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* Module for the NFSv4.1 pNFS block layout driver.
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*
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* Copyright (c) 2007 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Fred Isaman <iisaman@umich.edu>
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* Andy Adamson <andros@citi.umich.edu>
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*
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* permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the university of michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. if
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* the above copyright notice or any other identification of the
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* university of michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the
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* university of michigan as to its fitness for any purpose, and without
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* warranty by the university of michigan of any kind, either express
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* or implied, including without limitation the implied warranties of
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* merchantability and fitness for a particular purpose. the regents
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* of the university of michigan shall not be liable for any damages,
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* including special, indirect, incidental, or consequential damages,
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* with respect to any claim arising out or in connection with the use
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* of the software, even if it has been or is hereafter advised of the
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* possibility of such damages.
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*/
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#include <linux/genhd.h> /* gendisk - used in a dprintk*/
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#include <linux/sched.h>
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#include <linux/hash.h>
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#include "blocklayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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static void dev_remove(struct net *net, dev_t dev)
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{
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struct bl_pipe_msg bl_pipe_msg;
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struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
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struct bl_dev_msg bl_umount_request;
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struct bl_msg_hdr bl_msg = {
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.type = BL_DEVICE_UMOUNT,
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.totallen = sizeof(bl_umount_request),
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};
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uint8_t *dataptr;
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DECLARE_WAITQUEUE(wq, current);
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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dprintk("Entering %s\n", __func__);
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bl_pipe_msg.bl_wq = &nn->bl_wq;
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memset(&msg, 0, sizeof(*msg));
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msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);
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if (!msg->data)
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goto out;
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memset(&bl_umount_request, 0, sizeof(bl_umount_request));
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bl_umount_request.major = MAJOR(dev);
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bl_umount_request.minor = MINOR(dev);
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memcpy(msg->data, &bl_msg, sizeof(bl_msg));
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dataptr = (uint8_t *) msg->data;
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memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
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msg->len = sizeof(bl_msg) + bl_msg.totallen;
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add_wait_queue(&nn->bl_wq, &wq);
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if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
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remove_wait_queue(&nn->bl_wq, &wq);
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goto out;
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}
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule();
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&nn->bl_wq, &wq);
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out:
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kfree(msg->data);
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}
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/*
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* Release meta device
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*/
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static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
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{
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int rv;
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dprintk("%s Releasing\n", __func__);
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rv = nfs4_blkdev_put(bdev->bm_mdev);
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if (rv)
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printk(KERN_ERR "NFS: %s nfs4_blkdev_put returns %d\n",
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__func__, rv);
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dev_remove(bdev->net, bdev->bm_mdev->bd_dev);
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}
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void bl_free_block_dev(struct pnfs_block_dev *bdev)
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{
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if (bdev) {
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if (bdev->bm_mdev) {
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dprintk("%s Removing DM device: %d:%d\n",
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__func__,
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MAJOR(bdev->bm_mdev->bd_dev),
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MINOR(bdev->bm_mdev->bd_dev));
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nfs4_blk_metadev_release(bdev);
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}
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kfree(bdev);
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}
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}
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