Return-Path: Received: from int-mailstore01.merit.edu ([207.75.116.232]:60695 "EHLO int-mailstore01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754463Ab1FLXoY (ORCPT ); Sun, 12 Jun 2011 19:44:24 -0400 Message-Id: In-Reply-To: References: Date: Sun, 12 Jun 2011 19:44:22 -0400 Subject: [PATCH 14/34] pnfsblock: remove device operations From: Jim Rees To: linux-nfs@vger.kernel.org Cc: peter honeyman Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 Signed-off-by: Fred Isaman Signed-off-by: Benny Halevy --- fs/nfs/blocklayout/Makefile | 2 +- fs/nfs/blocklayout/blocklayout.h | 2 + fs/nfs/blocklayout/blocklayoutdm.c | 120 ++++++++++++++++++++++++++++++++++++ 3 files changed, 123 insertions(+), 1 deletions(-) create mode 100644 fs/nfs/blocklayout/blocklayoutdm.c diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile index bd69aad..bdbf180 100644 --- a/fs/nfs/blocklayout/Makefile +++ b/fs/nfs/blocklayout/Makefile @@ -2,4 +2,4 @@ # Makefile for the pNFS block layout driver kernel module # obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o -blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o blocklayoutdev.o +blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o blocklayoutdev.o blocklayoutdm.o diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h index 6c01d8c..e5ee11c 100644 --- a/fs/nfs/blocklayout/blocklayout.h +++ b/fs/nfs/blocklayout/blocklayout.h @@ -102,6 +102,8 @@ struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, struct list_head *sdlist); int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); +/* blocklayoutdm.c */ +void free_block_dev(struct pnfs_block_dev *bdev); #include diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c new file mode 100644 index 0000000..097dd05 --- /dev/null +++ b/fs/nfs/blocklayout/blocklayoutdm.c @@ -0,0 +1,120 @@ +/* + * 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 + * Andy Adamson + * + * 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 /* gendisk - used in a dprintk*/ +#include +#include + +#include "blocklayout.h" + +#define NFSDBG_FACILITY NFSDBG_PNFS_LD + +/* Defines used for calculating memory usage in nfs4_blk_flatten() */ +#define ARGSIZE 24 /* Max bytes needed for linear target arg string */ +#define SPECSIZE (sizeof8(struct dm_target_spec) + ARGSIZE) +#define SPECS_PER_PAGE (PAGE_SIZE / SPECSIZE) +#define SPEC_HEADER_ADJUST (SPECS_PER_PAGE - \ + (PAGE_SIZE - sizeof8(struct dm_ioctl)) / SPECSIZE) +#define roundup8(x) (((x)+7) & ~7) +#define sizeof8(x) roundup8(sizeof(x)) + +static int dev_remove(dev_t dev) +{ + int ret = 1; + struct pipefs_hdr *msg = NULL, *reply = NULL; + uint64_t bl_dev; + uint32_t major = MAJOR(dev), minor = MINOR(dev); + + dprintk("Entering %s\n", __func__); + + if (IS_ERR(bl_device_pipe)) + return ret; + + memcpy((void *)&bl_dev, &major, sizeof(uint32_t)); + memcpy((void *)&bl_dev + sizeof(uint32_t), &minor, sizeof(uint32_t)); + msg = pipefs_alloc_init_msg(0, BL_DEVICE_UMOUNT, 0, (void *)&bl_dev, + sizeof(uint64_t)); + if (IS_ERR(msg)) { + dprintk("ERROR: couldn't make pipefs message.\n"); + goto out; + } + msg->msgid = hash_ptr(&msg, sizeof(msg->msgid) * 8); + msg->status = BL_DEVICE_REQUEST_INIT; + + reply = pipefs_queue_upcall_waitreply(bl_device_pipe, msg, + &bl_device_list, 0, 0); + if (IS_ERR(reply)) { + dprintk("ERROR: upcall_waitreply failed\n"); + goto out; + } + + if (reply->status == BL_DEVICE_REQUEST_PROC) + ret = 0; /*TODO: what to return*/ +out: + if (!IS_ERR(reply)) + kfree(reply); + if (!IS_ERR(msg)) + kfree(msg); + return ret; +} + +/* + * Release meta device + */ +static int nfs4_blk_metadev_release(struct pnfs_block_dev *bdev) +{ + int rv; + + dprintk("%s Releasing\n", __func__); + /* XXX Check return? */ + rv = nfs4_blkdev_put(bdev->bm_mdev); + dprintk("%s nfs4_blkdev_put returns %d\n", __func__, rv); + + rv = dev_remove(bdev->bm_mdev->bd_dev); + dprintk("%s Returns %d\n", __func__, rv); + return rv; +} + +void 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)); + /* XXX Check status ?? */ + nfs4_blk_metadev_release(bdev); + } + kfree(bdev); + } +} -- 1.7.4.1