2010-10-19 22:18:00 -06:00
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/*
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* Module for the pnfs nfs4 file layout driver.
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* Defines all I/O and Policy interface operations, plus code
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* to register itself with the pNFS client.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@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 or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#include <linux/nfs_fs.h>
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2010-10-19 22:18:04 -06:00
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#include "internal.h"
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#include "nfs4filelayout.h"
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2010-10-19 22:18:00 -06:00
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
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MODULE_DESCRIPTION("The NFSv4 file layout driver");
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2010-10-21 14:56:48 -06:00
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static int
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filelayout_set_layoutdriver(struct nfs_server *nfss)
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2010-10-19 22:18:00 -06:00
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{
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2010-10-19 22:18:04 -06:00
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int status = pnfs_alloc_init_deviceid_cache(nfss->nfs_client,
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nfs4_fl_free_deviceid_callback);
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if (status) {
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printk(KERN_WARNING "%s: deviceid cache could not be "
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"initialized\n", __func__);
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return status;
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}
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dprintk("%s: deviceid cache has been initialized successfully\n",
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__func__);
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2010-10-19 22:18:00 -06:00
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return 0;
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}
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2010-10-21 14:56:48 -06:00
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/* Clear out the layout by destroying its device list */
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static int
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filelayout_clear_layoutdriver(struct nfs_server *nfss)
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2010-10-19 22:18:00 -06:00
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{
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dprintk("--> %s\n", __func__);
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2010-10-19 22:18:04 -06:00
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if (nfss->nfs_client->cl_devid_cache)
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pnfs_put_deviceid_cache(nfss->nfs_client);
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2010-10-19 22:18:00 -06:00
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return 0;
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}
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2010-10-19 22:18:04 -06:00
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/*
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* filelayout_check_layout()
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*
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* Make sure layout segment parameters are sane WRT the device.
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* At this point no generic layer initialization of the lseg has occurred,
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* and nothing has been added to the layout_hdr cache.
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*
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*/
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static int
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filelayout_check_layout(struct pnfs_layout_hdr *lo,
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struct nfs4_filelayout_segment *fl,
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struct nfs4_layoutget_res *lgr,
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struct nfs4_deviceid *id)
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{
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struct nfs4_file_layout_dsaddr *dsaddr;
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int status = -EINVAL;
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2011-01-06 04:36:21 -07:00
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struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
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2010-10-19 22:18:04 -06:00
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dprintk("--> %s\n", __func__);
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if (fl->pattern_offset > lgr->range.offset) {
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dprintk("%s pattern_offset %lld to large\n",
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__func__, fl->pattern_offset);
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goto out;
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}
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if (fl->stripe_unit % PAGE_SIZE) {
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dprintk("%s Stripe unit (%u) not page aligned\n",
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__func__, fl->stripe_unit);
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goto out;
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}
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/* find and reference the deviceid */
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dsaddr = nfs4_fl_find_get_deviceid(nfss->nfs_client, id);
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if (dsaddr == NULL) {
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2011-01-06 04:36:21 -07:00
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dsaddr = get_device_info(lo->plh_inode, id);
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2010-10-19 22:18:04 -06:00
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if (dsaddr == NULL)
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goto out;
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}
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fl->dsaddr = dsaddr;
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if (fl->first_stripe_index < 0 ||
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fl->first_stripe_index >= dsaddr->stripe_count) {
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dprintk("%s Bad first_stripe_index %d\n",
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__func__, fl->first_stripe_index);
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goto out_put;
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}
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if ((fl->stripe_type == STRIPE_SPARSE &&
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fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
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(fl->stripe_type == STRIPE_DENSE &&
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fl->num_fh != dsaddr->stripe_count)) {
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dprintk("%s num_fh %u not valid for given packing\n",
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__func__, fl->num_fh);
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goto out_put;
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}
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if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
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dprintk("%s Stripe unit (%u) not aligned with rsize %u "
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"wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
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nfss->wsize);
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}
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status = 0;
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out:
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dprintk("--> %s returns %d\n", __func__, status);
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return status;
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out_put:
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pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache, &dsaddr->deviceid);
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goto out;
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}
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static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
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{
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int i;
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for (i = 0; i < fl->num_fh; i++) {
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if (!fl->fh_array[i])
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break;
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kfree(fl->fh_array[i]);
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}
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kfree(fl->fh_array);
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fl->fh_array = NULL;
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}
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static void
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_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
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{
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filelayout_free_fh_array(fl);
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kfree(fl);
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}
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static int
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filelayout_decode_layout(struct pnfs_layout_hdr *flo,
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struct nfs4_filelayout_segment *fl,
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struct nfs4_layoutget_res *lgr,
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struct nfs4_deviceid *id)
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{
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uint32_t *p = (uint32_t *)lgr->layout.buf;
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uint32_t nfl_util;
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int i;
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dprintk("%s: set_layout_map Begin\n", __func__);
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memcpy(id, p, sizeof(*id));
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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print_deviceid(id);
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nfl_util = be32_to_cpup(p++);
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if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
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fl->commit_through_mds = 1;
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if (nfl_util & NFL4_UFLG_DENSE)
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fl->stripe_type = STRIPE_DENSE;
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else
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fl->stripe_type = STRIPE_SPARSE;
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fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
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fl->first_stripe_index = be32_to_cpup(p++);
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p = xdr_decode_hyper(p, &fl->pattern_offset);
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fl->num_fh = be32_to_cpup(p++);
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dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
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__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
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fl->pattern_offset);
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fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
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GFP_KERNEL);
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if (!fl->fh_array)
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return -ENOMEM;
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for (i = 0; i < fl->num_fh; i++) {
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/* Do we want to use a mempool here? */
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fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
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if (!fl->fh_array[i]) {
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filelayout_free_fh_array(fl);
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return -ENOMEM;
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}
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fl->fh_array[i]->size = be32_to_cpup(p++);
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if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
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printk(KERN_ERR "Too big fh %d received %d\n",
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i, fl->fh_array[i]->size);
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filelayout_free_fh_array(fl);
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return -EIO;
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}
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memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
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p += XDR_QUADLEN(fl->fh_array[i]->size);
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dprintk("DEBUG: %s: fh len %d\n", __func__,
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fl->fh_array[i]->size);
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}
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return 0;
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}
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static struct pnfs_layout_segment *
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filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
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struct nfs4_layoutget_res *lgr)
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{
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struct nfs4_filelayout_segment *fl;
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int rc;
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struct nfs4_deviceid id;
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dprintk("--> %s\n", __func__);
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fl = kzalloc(sizeof(*fl), GFP_KERNEL);
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if (!fl)
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return NULL;
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rc = filelayout_decode_layout(layoutid, fl, lgr, &id);
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if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) {
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_filelayout_free_lseg(fl);
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return NULL;
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}
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return &fl->generic_hdr;
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}
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static void
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filelayout_free_lseg(struct pnfs_layout_segment *lseg)
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{
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2011-01-06 04:36:21 -07:00
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struct nfs_server *nfss = NFS_SERVER(lseg->pls_layout->plh_inode);
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2010-10-19 22:18:04 -06:00
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struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
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dprintk("--> %s\n", __func__);
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pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache,
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&fl->dsaddr->deviceid);
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_filelayout_free_lseg(fl);
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}
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2010-10-19 22:18:00 -06:00
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static struct pnfs_layoutdriver_type filelayout_type = {
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.id = LAYOUT_NFSV4_1_FILES,
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.name = "LAYOUT_NFSV4_1_FILES",
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.owner = THIS_MODULE,
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2010-10-21 14:56:48 -06:00
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.set_layoutdriver = filelayout_set_layoutdriver,
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.clear_layoutdriver = filelayout_clear_layoutdriver,
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2010-10-19 22:18:04 -06:00
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.alloc_lseg = filelayout_alloc_lseg,
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.free_lseg = filelayout_free_lseg,
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2010-10-19 22:18:00 -06:00
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};
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static int __init nfs4filelayout_init(void)
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{
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printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
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__func__);
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return pnfs_register_layoutdriver(&filelayout_type);
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}
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static void __exit nfs4filelayout_exit(void)
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{
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printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
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__func__);
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pnfs_unregister_layoutdriver(&filelayout_type);
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}
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module_init(nfs4filelayout_init);
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module_exit(nfs4filelayout_exit);
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