85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
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/*
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* pNFS functions to call and manage layout drivers.
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*
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* Copyright (c) 2002 [year of first publication]
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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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#include "pnfs.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS
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/* STUB that returns the equivalent of "no module found" */
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static struct pnfs_layoutdriver_type *
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find_pnfs_driver(u32 id)
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{
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return NULL;
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}
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void
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unset_pnfs_layoutdriver(struct nfs_server *nfss)
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{
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nfss->pnfs_curr_ld = NULL;
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}
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/*
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* Try to set the server's pnfs module to the pnfs layout type specified by id.
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* Currently only one pNFS layout driver per filesystem is supported.
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*
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* @id layout type. Zero (illegal layout type) indicates pNFS not in use.
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*/
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void
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set_pnfs_layoutdriver(struct nfs_server *server, u32 id)
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{
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struct pnfs_layoutdriver_type *ld_type = NULL;
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if (id == 0)
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goto out_no_driver;
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if (!(server->nfs_client->cl_exchange_flags &
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(EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
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printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__,
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id, server->nfs_client->cl_exchange_flags);
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goto out_no_driver;
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}
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ld_type = find_pnfs_driver(id);
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if (!ld_type) {
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request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
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ld_type = find_pnfs_driver(id);
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if (!ld_type) {
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dprintk("%s: No pNFS module found for %u.\n",
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__func__, id);
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goto out_no_driver;
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}
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}
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server->pnfs_curr_ld = ld_type;
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dprintk("%s: pNFS module for %u set\n", __func__, id);
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return;
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out_no_driver:
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dprintk("%s: Using NFSv4 I/O\n", __func__);
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server->pnfs_curr_ld = NULL;
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}
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