Return-Path: Received: from int-mailstore01.merit.edu ([207.75.116.232]:53020 "EHLO int-mailstore01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932074Ab1FGR1Z (ORCPT ); Tue, 7 Jun 2011 13:27:25 -0400 Date: Tue, 7 Jun 2011 13:27:23 -0400 From: Jim Rees To: Benny Halevy Cc: linux-nfs@vger.kernel.org, peter honeyman Subject: [PATCH 13/88] pnfsblock: scan scsi devices Message-ID: <83657c8f7323da3b32fe8785839f36e1aad33d4f.1307464382.git.rees@umich.edu> References: Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 From: Fred Isaman Scan scsi devices available to map against future GETDEVICEINFO output. [pnfsblock: use class iteration api] [pnfsblock: fix oops when using multiple devices] Signed-off-by: Fred Isaman Signed-off-by: Benny Halevy --- fs/nfs/blocklayout/Makefile | 2 +- fs/nfs/blocklayout/blocklayout.c | 13 ++- fs/nfs/blocklayout/blocklayout.h | 53 ++++++++ fs/nfs/blocklayout/blocklayoutdev.c | 231 +++++++++++++++++++++++++++++++++++ 4 files changed, 295 insertions(+), 4 deletions(-) create mode 100644 fs/nfs/blocklayout/blocklayout.h create mode 100644 fs/nfs/blocklayout/blocklayoutdev.c diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile index 6bf49cd..36d959f 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 +blocklayoutdriver-objs := blocklayout.o blocklayoutdev.o diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c index 1312849..9889f27 100644 --- a/fs/nfs/blocklayout/blocklayout.c +++ b/fs/nfs/blocklayout/blocklayout.c @@ -32,9 +32,7 @@ #include #include -#include -#include /* Needed by nfs4_pnfs.h */ -#include +#include "blocklayout.h" #define NFSDBG_FACILITY NFSDBG_PNFS_LD @@ -135,10 +133,19 @@ bl_cleanup_layoutcommit(struct pnfs_layout_type *lo, dprintk("%s enter\n", __func__); } +/* + * This is just a STUB to check the scsi scanning code + */ static struct pnfs_mount_type * bl_initialize_mountpoint(struct super_block *sb, struct nfs_fh *fh) { + LIST_HEAD(scsi_disklist); + dprintk("%s enter\n", __func__); + + nfs4_blk_create_scsi_disk_list(&scsi_disklist); + nfs4_blk_destroy_disk_list(&scsi_disklist); + return NULL; } diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h new file mode 100644 index 0000000..5dbb8f2 --- /dev/null +++ b/fs/nfs/blocklayout/blocklayout.h @@ -0,0 +1,53 @@ +/* + * linux/fs/nfs/blocklayout/blocklayout.h + * + * Module for the NFSv4.1 pNFS block 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. + */ +#ifndef FS_NFS_NFS4BLOCKLAYOUT_H +#define FS_NFS_NFS4BLOCKLAYOUT_H + +#include +#include /* Needed by nfs4_pnfs.h */ +#include + +extern struct class shost_class; /* exported from drivers/scsi/hosts.c */ + +/* holds visible disks that can be matched against VOLUME_SIMPLE signatures */ +struct visible_block_device { + struct list_head vi_node; + struct block_device *vi_bdev; + int vi_mapped; + int vi_put_done; +}; + +/* blocklayoutdev.c */ +int nfs4_blk_create_scsi_disk_list(struct list_head *); +void nfs4_blk_destroy_disk_list(struct list_head *); + +#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c new file mode 100644 index 0000000..b4f52fb --- /dev/null +++ b/fs/nfs/blocklayout/blocklayoutdev.c @@ -0,0 +1,231 @@ +/* + * 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 + +#define MAX_VOLS 256 /* Maximum number of SCSI disks. Totally arbitrary */ + +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. */ +static struct block_device *nfs4_blkdev_get(dev_t dev) +{ + struct block_device *bd; + + dprintk("%s enter\n", __func__); + bd = open_by_devnum(dev, FMODE_READ); + 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 + */ +static int nfs4_blkdev_put(struct block_device *bdev) +{ + dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev), + MINOR(bdev->bd_dev)); + bd_release(bdev); + return blkdev_put(bdev, FMODE_READ); +} + +/* Add a visible, claimed (by us!) scsi disk to the device list */ +static int alloc_add_disk(struct block_device *blk_dev, struct list_head *dlist) +{ + struct visible_block_device *vis_dev; + + dprintk("%s enter\n", __func__); + vis_dev = kmalloc(sizeof(struct visible_block_device), GFP_KERNEL); + if (!vis_dev) { + dprintk("%s nfs4_get_sig failed\n", __func__); + return -ENOMEM; + } + vis_dev->vi_bdev = blk_dev; + vis_dev->vi_mapped = 0; + vis_dev->vi_put_done = 0; + list_add(&vis_dev->vi_node, dlist); + return 0; +} + +/* Walk the list of scsi_devices. Add disks that can be opened and claimed + * to the device list + */ +static int +nfs4_blk_add_scsi_disk(struct Scsi_Host *shost, + int index, struct list_head *dlist) +{ + static char *claim_ptr = "I belong to pnfs block driver"; + struct block_device *bdev; + struct gendisk *gd; + struct scsi_device *sdev; + unsigned int major, minor, ret = 0; + dev_t dev; + + dprintk("%s enter \n", __func__); + if (index >= MAX_VOLS) { + dprintk("%s MAX_VOLS hit\n", __func__); + return -ENOSPC; + } + dprintk("%s 1 \n", __func__); + index--; + shost_for_each_device(sdev, shost) { + dprintk("%s 2\n", __func__); + /* Need to do this check before bumping index */ + if (sdev->type != TYPE_DISK) + continue; + dprintk("%s 3 index %d \n", __func__, index); + if (++index >= MAX_VOLS) { + scsi_device_put(sdev); + break; + } + major = (!(index >> 4) ? SCSI_DISK0_MAJOR : + SCSI_DISK1_MAJOR-1 + (index >> 4)); + minor = ((index << 4) & 255); + + dprintk("%s SCSI device %d:%d \n", __func__, major, minor); + + dev = MKDEV(major, minor); + bdev = nfs4_blkdev_get(dev); + if (!bdev) { + dprintk("%s: failed to open device %d:%d\n", + __func__, major, minor); + continue; + } + gd = bdev->bd_disk; + + dprintk("%s 4\n", __func__); + + if (bd_claim(bdev, claim_ptr)) { + dprintk("%s: failed to claim device %d:%d\n", + __func__, gd->major, gd->first_minor); + blkdev_put(bdev, FMODE_READ); + continue; + } + + ret = alloc_add_disk(bdev, dlist); + if (ret < 0) + goto out_err; + dprintk("%s ADDED DEVICE capacity %ld, bd_block_size %d\n", + __func__, + (unsigned long)get_capacity(gd), + bdev->bd_block_size); + + } + index++; + dprintk("%s returns index %d \n", __func__, index); + return index; + +out_err: + dprintk("%s Can't add disk to list. ERROR: %d\n", __func__, ret); + nfs4_blkdev_put(bdev); + return ret; +} + +/* Destroy the temporary scsi disk list */ +void nfs4_blk_destroy_disk_list(struct list_head *dlist) +{ + struct visible_block_device *vis_dev; + + dprintk("%s enter\n", __func__); + while (!list_empty(dlist)) { + vis_dev = list_first_entry(dlist, struct visible_block_device, + vi_node); + dprintk("%s removing device %d:%d\n", __func__, + MAJOR(vis_dev->vi_bdev->bd_dev), + MINOR(vis_dev->vi_bdev->bd_dev)); + list_del(&vis_dev->vi_node); + if (!vis_dev->vi_put_done) + nfs4_blkdev_put(vis_dev->vi_bdev); + kfree(vis_dev); + } +} + +struct nfs4_blk_scsi_disk_list_ctl { + struct list_head *dlist; + int index; +}; + +static int nfs4_blk_iter_scsi_disk_list(struct device *cdev, void *data) +{ + struct Scsi_Host *shost; + struct nfs4_blk_scsi_disk_list_ctl *lc = data; + int ret; + + dprintk("%s enter\n", __func__); + shost = class_to_shost(cdev); + ret = nfs4_blk_add_scsi_disk(shost, lc->index, lc->dlist); + dprintk("%s 1 ret %d\n", __func__, ret); + if (ret >= 0) { + lc->index = ret; + ret = 0; + } + return ret; +} + +/* + * Create a temporary list of all SCSI disks host can see, and that have not + * yet been claimed. + * shost_class: list of all registered scsi_hosts + * returns -errno on error, and #of devices found on success. + * XXX Loosely emulate scsi_host_lookup from scsi/host.c +*/ +int nfs4_blk_create_scsi_disk_list(struct list_head *dlist) +{ + struct nfs4_blk_scsi_disk_list_ctl lc = { + .dlist = dlist, + .index = 0, + }; + + dprintk("%s enter\n", __func__); + return class_for_each_device(&shost_class, NULL, + &lc, nfs4_blk_iter_scsi_disk_list); +} -- 1.7.4.1