Return-Path: Received: from int-mailstore01.merit.edu ([207.75.116.232]:60688 "EHLO int-mailstore01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754463Ab1FLXoW (ORCPT ); Sun, 12 Jun 2011 19:44:22 -0400 Message-Id: <6d11b21aa8153819f20173f45e18c4907a16f7ed.1307921138.git.rees@umich.edu> In-Reply-To: References: Date: Sun, 12 Jun 2011 19:44:19 -0400 Subject: [PATCH 13/34] pnfsblock: add 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 | 15 ++++ fs/nfs/blocklayout/blocklayoutdev.c | 151 +++++++++++++++++++++++++++++++++++ 3 files changed, 167 insertions(+), 1 deletions(-) create mode 100644 fs/nfs/blocklayout/blocklayoutdev.c diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile index af39d19..bd69aad 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 +blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o blocklayoutdev.o diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h index ef1e64d..6c01d8c 100644 --- a/fs/nfs/blocklayout/blocklayout.h +++ b/fs/nfs/blocklayout/blocklayout.h @@ -35,6 +35,12 @@ #include #include "../pnfs.h" +struct pnfs_block_dev { + struct list_head bm_node; + struct nfs4_deviceid bm_mdevid; /* associated devid */ + struct block_device *bm_mdev; /* meta device itself */ +}; + enum exstate4 { PNFS_BLOCK_READWRITE_DATA = 0, PNFS_BLOCK_READ_DATA = 1, @@ -88,6 +94,15 @@ BLK_LO2EXT(struct pnfs_layout_hdr *lo) return container_of(lo, struct pnfs_block_layout, bl_layout); } +/* blocklayoutdev.c */ +struct block_device *nfs4_blkdev_get(dev_t dev); +int nfs4_blkdev_put(struct block_device *bdev); +struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, + struct pnfs_device *dev, + struct list_head *sdlist); +int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, + struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); + #include extern struct pipefs_list bl_device_list; diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c new file mode 100644 index 0000000..9a65a66 --- /dev/null +++ b/fs/nfs/blocklayout/blocklayoutdev.c @@ -0,0 +1,151 @@ +/* + * linux/fs/nfs/blocklayout/blocklayoutdev.c + * + * Device operations for the pnfs nfs4 file layout driver. + * + * Copyright (c) 2006 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson + * Fred Isaman + * + * 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 +#include /* __bread */ + +#include +#include +#include + +#include "blocklayout.h" + +#define NFSDBG_FACILITY NFSDBG_PNFS_LD + +uint32_t *blk_overflow(uint32_t *p, uint32_t *end, size_t nbytes) +{ + uint32_t *q = p + XDR_QUADLEN(nbytes); + if (unlikely(q > end || q < p)) + return NULL; + return p; +} +EXPORT_SYMBOL(blk_overflow); + +/* Open a block_device by device number. */ +struct block_device *nfs4_blkdev_get(dev_t dev) +{ + struct block_device *bd; + + dprintk("%s enter\n", __func__); + bd = blkdev_get_by_dev(dev, FMODE_READ, NULL); + if (IS_ERR(bd)) + goto fail; + return bd; +fail: + dprintk("%s failed to open device : %ld\n", + __func__, PTR_ERR(bd)); + return NULL; +} + +/* + * Release the block device + */ +int nfs4_blkdev_put(struct block_device *bdev) +{ + dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev), + MINOR(bdev->bd_dev)); + return blkdev_put(bdev, FMODE_READ); +} + +/* Decodes pnfs_block_deviceaddr4 (draft-8) which is XDR encoded + * in dev->dev_addr_buf. + */ +struct pnfs_block_dev * +nfs4_blk_decode_device(struct nfs_server *server, + struct pnfs_device *dev, + struct list_head *sdlist) +{ + struct pnfs_block_dev *rv = NULL; + struct block_device *bd = NULL; + struct pipefs_hdr *msg = NULL, *reply = NULL; + uint32_t major, minor; + + dprintk("%s enter\n", __func__); + + if (IS_ERR(bl_device_pipe)) + return NULL; + dprintk("%s CREATING PIPEFS MESSAGE\n", __func__); + dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data, + dev->mincount); + msg = pipefs_alloc_init_msg(0, BL_DEVICE_MOUNT, 0, dev->area, + dev->mincount); + if (IS_ERR(msg)) { + dprintk("ERROR: couldn't make pipefs message.\n"); + goto out_err; + } + msg->msgid = hash_ptr(&msg, sizeof(msg->msgid) * 8); + msg->status = BL_DEVICE_REQUEST_INIT; + + dprintk("%s CALLING USERSPACE DAEMON\n", __func__); + 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_err; + } + if (reply->status != BL_DEVICE_REQUEST_PROC) { + dprintk("%s failed to open device: %ld\n", + __func__, PTR_ERR(bd)); + goto out_err; + } + memcpy(&major, (uint32_t *)(payload_of(reply)), sizeof(uint32_t)); + memcpy(&minor, (uint32_t *)(payload_of(reply) + sizeof(uint32_t)), + sizeof(uint32_t)); + bd = nfs4_blkdev_get(MKDEV(major, minor)); + if (IS_ERR(bd)) { + dprintk("%s failed to open device : %ld\n", + __func__, PTR_ERR(bd)); + goto out_err; + } + + rv = kzalloc(sizeof(*rv), GFP_KERNEL); + if (!rv) + goto out_err; + + rv->bm_mdev = bd; + memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid)); + dprintk("%s Created device %s with bd_block_size %u\n", + __func__, + bd->bd_disk->disk_name, + bd->bd_block_size); + kfree(reply); + kfree(msg); + return rv; + +out_err: + kfree(rv); + if (!IS_ERR(reply)) + kfree(reply); + if (!IS_ERR(msg)) + kfree(msg); + return NULL; +} -- 1.7.4.1