mirror of https://gitee.com/openkylin/linux.git
400 lines
11 KiB
C
400 lines
11 KiB
C
/*
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* linux/fs/nfs/blocklayout/blocklayoutdev.c
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*
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* Device operations for the pnfs nfs4 file layout driver.
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*
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* Copyright (c) 2006 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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* Fred Isaman <iisaman@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/module.h>
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#include <linux/buffer_head.h> /* __bread */
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#include <linux/genhd.h>
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#include <linux/blkdev.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 int decode_sector_number(__be32 **rp, sector_t *sp)
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{
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uint64_t s;
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*rp = xdr_decode_hyper(*rp, &s);
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if (s & 0x1ff) {
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printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__);
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return -1;
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}
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*sp = s >> SECTOR_SHIFT;
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return 0;
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}
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/* Open a block_device by device number. */
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struct block_device *nfs4_blkdev_get(dev_t dev)
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{
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struct block_device *bd;
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dprintk("%s enter\n", __func__);
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bd = blkdev_get_by_dev(dev, FMODE_READ, NULL);
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if (IS_ERR(bd))
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goto fail;
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return bd;
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fail:
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dprintk("%s failed to open device : %ld\n",
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__func__, PTR_ERR(bd));
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return NULL;
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}
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/*
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* Release the block device
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*/
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int nfs4_blkdev_put(struct block_device *bdev)
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{
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dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
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MINOR(bdev->bd_dev));
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return blkdev_put(bdev, FMODE_READ);
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}
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ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
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size_t mlen)
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{
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struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
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nfs_net_id);
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if (mlen != sizeof (struct bl_dev_msg))
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return -EINVAL;
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if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
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return -EFAULT;
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wake_up(&nn->bl_wq);
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return mlen;
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}
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void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
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{
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struct bl_pipe_msg *bl_pipe_msg = container_of(msg, struct bl_pipe_msg, msg);
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if (msg->errno >= 0)
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return;
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wake_up(bl_pipe_msg->bl_wq);
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}
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/*
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* Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
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*/
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struct pnfs_block_dev *
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nfs4_blk_decode_device(struct nfs_server *server,
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struct pnfs_device *dev)
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{
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struct pnfs_block_dev *rv;
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struct block_device *bd = NULL;
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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_msg_hdr bl_msg = {
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.type = BL_DEVICE_MOUNT,
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.totallen = dev->mincount,
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};
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uint8_t *dataptr;
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DECLARE_WAITQUEUE(wq, current);
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int offset, len, i, rc;
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struct net *net = server->nfs_client->cl_net;
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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struct bl_dev_msg *reply = &nn->bl_mount_reply;
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dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
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dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
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dev->mincount);
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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(sizeof(bl_msg) + dev->mincount, GFP_NOFS);
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if (!msg->data) {
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rv = ERR_PTR(-ENOMEM);
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goto out;
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}
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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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len = dev->mincount;
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offset = sizeof(bl_msg);
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for (i = 0; len > 0; i++) {
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memcpy(&dataptr[offset], page_address(dev->pages[i]),
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len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
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len -= PAGE_CACHE_SIZE;
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offset += PAGE_CACHE_SIZE;
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}
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msg->len = sizeof(bl_msg) + dev->mincount;
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dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
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add_wait_queue(&nn->bl_wq, &wq);
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rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
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if (rc < 0) {
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remove_wait_queue(&nn->bl_wq, &wq);
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rv = ERR_PTR(rc);
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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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if (reply->status != BL_DEVICE_REQUEST_PROC) {
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dprintk("%s failed to open device: %d\n",
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__func__, reply->status);
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rv = ERR_PTR(-EINVAL);
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goto out;
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}
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bd = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
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if (IS_ERR(bd)) {
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rc = PTR_ERR(bd);
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dprintk("%s failed to open device : %d\n", __func__, rc);
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rv = ERR_PTR(rc);
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goto out;
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}
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rv = kzalloc(sizeof(*rv), GFP_NOFS);
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if (!rv) {
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rv = ERR_PTR(-ENOMEM);
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goto out;
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}
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rv->bm_mdev = bd;
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memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
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rv->net = net;
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dprintk("%s Created device %s with bd_block_size %u\n",
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__func__,
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bd->bd_disk->disk_name,
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bd->bd_block_size);
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out:
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kfree(msg->data);
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return rv;
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}
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/* Map deviceid returned by the server to constructed block_device */
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static struct block_device *translate_devid(struct pnfs_layout_hdr *lo,
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struct nfs4_deviceid *id)
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{
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struct block_device *rv = NULL;
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struct block_mount_id *mid;
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struct pnfs_block_dev *dev;
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dprintk("%s enter, lo=%p, id=%p\n", __func__, lo, id);
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mid = BLK_ID(lo);
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spin_lock(&mid->bm_lock);
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list_for_each_entry(dev, &mid->bm_devlist, bm_node) {
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if (memcmp(id->data, dev->bm_mdevid.data,
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NFS4_DEVICEID4_SIZE) == 0) {
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rv = dev->bm_mdev;
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goto out;
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}
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}
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out:
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spin_unlock(&mid->bm_lock);
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dprintk("%s returning %p\n", __func__, rv);
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return rv;
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}
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/* Tracks info needed to ensure extents in layout obey constraints of spec */
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struct layout_verification {
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u32 mode; /* R or RW */
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u64 start; /* Expected start of next non-COW extent */
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u64 inval; /* Start of INVAL coverage */
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u64 cowread; /* End of COW read coverage */
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};
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/* Verify the extent meets the layout requirements of the pnfs-block draft,
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* section 2.3.1.
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*/
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static int verify_extent(struct pnfs_block_extent *be,
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struct layout_verification *lv)
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{
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if (lv->mode == IOMODE_READ) {
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if (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
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be->be_state == PNFS_BLOCK_INVALID_DATA)
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return -EIO;
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if (be->be_f_offset != lv->start)
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return -EIO;
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lv->start += be->be_length;
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return 0;
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}
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/* lv->mode == IOMODE_RW */
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if (be->be_state == PNFS_BLOCK_READWRITE_DATA) {
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if (be->be_f_offset != lv->start)
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return -EIO;
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if (lv->cowread > lv->start)
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return -EIO;
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lv->start += be->be_length;
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lv->inval = lv->start;
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return 0;
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} else if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
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if (be->be_f_offset != lv->start)
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return -EIO;
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lv->start += be->be_length;
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return 0;
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} else if (be->be_state == PNFS_BLOCK_READ_DATA) {
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if (be->be_f_offset > lv->start)
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return -EIO;
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if (be->be_f_offset < lv->inval)
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return -EIO;
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if (be->be_f_offset < lv->cowread)
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return -EIO;
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/* It looks like you might want to min this with lv->start,
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* but you really don't.
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*/
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lv->inval = lv->inval + be->be_length;
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lv->cowread = be->be_f_offset + be->be_length;
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return 0;
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} else
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return -EIO;
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}
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/* XDR decode pnfs_block_layout4 structure */
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int
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nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
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struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
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{
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struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
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int i, status = -EIO;
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uint32_t count;
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struct pnfs_block_extent *be = NULL, *save;
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struct xdr_stream stream;
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struct xdr_buf buf;
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struct page *scratch;
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__be32 *p;
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struct layout_verification lv = {
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.mode = lgr->range.iomode,
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.start = lgr->range.offset >> SECTOR_SHIFT,
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.inval = lgr->range.offset >> SECTOR_SHIFT,
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.cowread = lgr->range.offset >> SECTOR_SHIFT,
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};
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LIST_HEAD(extents);
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dprintk("---> %s\n", __func__);
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scratch = alloc_page(gfp_flags);
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if (!scratch)
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return -ENOMEM;
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xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err;
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count = be32_to_cpup(p++);
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dprintk("%s enter, number of extents %i\n", __func__, count);
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p = xdr_inline_decode(&stream, (28 + NFS4_DEVICEID4_SIZE) * count);
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if (unlikely(!p))
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goto out_err;
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/* Decode individual extents, putting them in temporary
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* staging area until whole layout is decoded to make error
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* recovery easier.
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*/
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for (i = 0; i < count; i++) {
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be = bl_alloc_extent();
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if (!be) {
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status = -ENOMEM;
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goto out_err;
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}
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memcpy(&be->be_devid, p, NFS4_DEVICEID4_SIZE);
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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be->be_mdev = translate_devid(lo, &be->be_devid);
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if (!be->be_mdev)
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goto out_err;
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/* The next three values are read in as bytes,
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* but stored as 512-byte sector lengths
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*/
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if (decode_sector_number(&p, &be->be_f_offset) < 0)
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goto out_err;
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if (decode_sector_number(&p, &be->be_length) < 0)
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goto out_err;
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if (decode_sector_number(&p, &be->be_v_offset) < 0)
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goto out_err;
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be->be_state = be32_to_cpup(p++);
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if (be->be_state == PNFS_BLOCK_INVALID_DATA)
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be->be_inval = &bl->bl_inval;
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if (verify_extent(be, &lv)) {
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dprintk("%s verify failed\n", __func__);
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goto out_err;
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}
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list_add_tail(&be->be_node, &extents);
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}
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if (lgr->range.offset + lgr->range.length !=
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lv.start << SECTOR_SHIFT) {
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dprintk("%s Final length mismatch\n", __func__);
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be = NULL;
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goto out_err;
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}
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if (lv.start < lv.cowread) {
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dprintk("%s Final uncovered COW extent\n", __func__);
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be = NULL;
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goto out_err;
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}
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/* Extents decoded properly, now try to merge them in to
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* existing layout extents.
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*/
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spin_lock(&bl->bl_ext_lock);
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list_for_each_entry_safe(be, save, &extents, be_node) {
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list_del(&be->be_node);
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status = bl_add_merge_extent(bl, be);
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if (status) {
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spin_unlock(&bl->bl_ext_lock);
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/* This is a fairly catastrophic error, as the
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* entire layout extent lists are now corrupted.
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* We should have some way to distinguish this.
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*/
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be = NULL;
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goto out_err;
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}
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}
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spin_unlock(&bl->bl_ext_lock);
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status = 0;
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out:
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__free_page(scratch);
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dprintk("%s returns %i\n", __func__, status);
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return status;
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out_err:
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bl_put_extent(be);
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while (!list_empty(&extents)) {
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be = list_first_entry(&extents, struct pnfs_block_extent,
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be_node);
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list_del(&be->be_node);
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bl_put_extent(be);
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}
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goto out;
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}
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