diff options
Diffstat (limited to 'fs/nfs/blocklayout/blocklayoutdm.c')
| -rw-r--r-- | fs/nfs/blocklayout/blocklayoutdm.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c new file mode 100644 index 00000000000..8999cfddd86 --- /dev/null +++ b/fs/nfs/blocklayout/blocklayoutdm.c @@ -0,0 +1,108 @@ +/* + * 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->len = sizeof(bl_msg) + bl_msg.totallen; + msg->data = kzalloc(msg->len, 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)); + + 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) +{ + dprintk("%s Releasing\n", __func__); + nfs4_blkdev_put(bdev->bm_mdev); + 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); + } +} |