2010-10-19 22:17:58 -06:00
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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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2010-10-19 22:18:02 -06:00
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#include "internal.h"
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2010-10-19 22:17:58 -06:00
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#include "pnfs.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS
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2010-10-19 22:17:59 -06:00
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/* Locking:
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*
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* pnfs_spinlock:
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* protects pnfs_modules_tbl.
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*/
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static DEFINE_SPINLOCK(pnfs_spinlock);
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/*
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* pnfs_modules_tbl holds all pnfs modules
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*/
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static LIST_HEAD(pnfs_modules_tbl);
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/* Return the registered pnfs layout driver module matching given id */
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static struct pnfs_layoutdriver_type *
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find_pnfs_driver_locked(u32 id)
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{
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struct pnfs_layoutdriver_type *local;
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list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
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if (local->id == id)
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goto out;
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local = NULL;
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out:
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dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
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return local;
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}
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2010-10-19 22:17:58 -06:00
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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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2010-10-19 22:17:59 -06:00
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struct pnfs_layoutdriver_type *local;
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spin_lock(&pnfs_spinlock);
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local = find_pnfs_driver_locked(id);
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spin_unlock(&pnfs_spinlock);
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return local;
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2010-10-19 22:17:58 -06:00
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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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2010-10-19 22:17:59 -06:00
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if (nfss->pnfs_curr_ld) {
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2010-10-21 14:56:48 -06:00
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nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
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2010-10-19 22:17:59 -06:00
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module_put(nfss->pnfs_curr_ld->owner);
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}
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2010-10-19 22:17:58 -06:00
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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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2010-10-19 22:17:59 -06:00
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if (!try_module_get(ld_type->owner)) {
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dprintk("%s: Could not grab reference on module\n", __func__);
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goto out_no_driver;
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}
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2010-10-19 22:17:58 -06:00
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server->pnfs_curr_ld = ld_type;
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2010-10-21 14:56:48 -06:00
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if (ld_type->set_layoutdriver(server)) {
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2010-10-19 22:17:59 -06:00
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printk(KERN_ERR
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"%s: Error initializing mount point for layout driver %u.\n",
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__func__, id);
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module_put(ld_type->owner);
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goto out_no_driver;
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}
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2010-10-19 22:17:58 -06:00
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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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2010-10-19 22:17:59 -06:00
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int
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pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
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{
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int status = -EINVAL;
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struct pnfs_layoutdriver_type *tmp;
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if (ld_type->id == 0) {
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printk(KERN_ERR "%s id 0 is reserved\n", __func__);
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return status;
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}
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2010-10-19 22:18:03 -06:00
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if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
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printk(KERN_ERR "%s Layout driver must provide "
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"alloc_lseg and free_lseg.\n", __func__);
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return status;
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}
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2010-10-19 22:17:59 -06:00
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spin_lock(&pnfs_spinlock);
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tmp = find_pnfs_driver_locked(ld_type->id);
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if (!tmp) {
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list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
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status = 0;
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dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
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ld_type->name);
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} else {
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printk(KERN_ERR "%s Module with id %d already loaded!\n",
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__func__, ld_type->id);
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}
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spin_unlock(&pnfs_spinlock);
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return status;
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}
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EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
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void
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pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
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{
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dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
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spin_lock(&pnfs_spinlock);
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list_del(&ld_type->pnfs_tblid);
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spin_unlock(&pnfs_spinlock);
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}
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EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
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2010-10-19 22:18:01 -06:00
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2010-10-19 22:18:03 -06:00
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/*
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* pNFS client layout cache
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*/
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2011-01-06 04:36:28 -07:00
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/* Need to hold i_lock if caller does not already hold reference */
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2011-01-06 04:36:30 -07:00
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void
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2011-01-06 04:36:28 -07:00
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get_layout_hdr(struct pnfs_layout_hdr *lo)
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2010-10-19 22:18:01 -06:00
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{
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2011-01-06 04:36:28 -07:00
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atomic_inc(&lo->plh_refcount);
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2010-10-19 22:18:01 -06:00
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}
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static void
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2011-01-06 04:36:28 -07:00
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destroy_layout_hdr(struct pnfs_layout_hdr *lo)
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2010-10-19 22:18:01 -06:00
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{
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2011-01-06 04:36:28 -07:00
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dprintk("%s: freeing layout cache %p\n", __func__, lo);
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BUG_ON(!list_empty(&lo->plh_layouts));
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NFS_I(lo->plh_inode)->layout = NULL;
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kfree(lo);
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}
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2010-10-19 22:18:01 -06:00
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2011-01-06 04:36:28 -07:00
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static void
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put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
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{
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if (atomic_dec_and_test(&lo->plh_refcount))
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destroy_layout_hdr(lo);
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2010-10-19 22:18:01 -06:00
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}
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2010-10-19 22:18:03 -06:00
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void
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2011-01-06 04:36:28 -07:00
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put_layout_hdr(struct pnfs_layout_hdr *lo)
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2010-10-19 22:18:02 -06:00
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{
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2011-01-06 04:36:28 -07:00
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struct inode *inode = lo->plh_inode;
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if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
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destroy_layout_hdr(lo);
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spin_unlock(&inode->i_lock);
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}
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2010-10-19 22:18:02 -06:00
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}
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static void
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init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
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{
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2011-01-06 04:36:20 -07:00
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INIT_LIST_HEAD(&lseg->pls_list);
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2011-01-06 04:36:23 -07:00
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atomic_set(&lseg->pls_refcount, 1);
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smp_mb();
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set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
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2011-01-06 04:36:20 -07:00
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lseg->pls_layout = lo;
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2010-10-19 22:18:02 -06:00
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}
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2011-01-06 04:36:23 -07:00
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static void free_lseg(struct pnfs_layout_segment *lseg)
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2010-10-19 22:18:02 -06:00
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{
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2011-01-06 04:36:21 -07:00
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struct inode *ino = lseg->pls_layout->plh_inode;
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2010-10-19 22:18:02 -06:00
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2010-10-19 22:18:03 -06:00
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NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
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2011-01-06 04:36:18 -07:00
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/* Matched by get_layout_hdr in pnfs_insert_layout */
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2011-01-06 04:36:28 -07:00
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put_layout_hdr(NFS_I(ino)->layout);
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2010-10-19 22:18:02 -06:00
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}
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2011-01-06 04:36:23 -07:00
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/* The use of tmp_list is necessary because pnfs_curr_ld->free_lseg
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* could sleep, so must be called outside of the lock.
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* Returns 1 if object was removed, otherwise return 0.
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*/
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static int
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put_lseg_locked(struct pnfs_layout_segment *lseg,
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struct list_head *tmp_list)
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2010-10-19 22:18:02 -06:00
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{
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2011-01-06 04:36:23 -07:00
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dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
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atomic_read(&lseg->pls_refcount),
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test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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if (atomic_dec_and_test(&lseg->pls_refcount)) {
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struct inode *ino = lseg->pls_layout->plh_inode;
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BUG_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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list_del(&lseg->pls_list);
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if (list_empty(&lseg->pls_layout->plh_segs)) {
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struct nfs_client *clp;
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clp = NFS_SERVER(ino)->nfs_client;
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spin_lock(&clp->cl_lock);
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/* List does not take a reference, so no need for put here */
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list_del_init(&lseg->pls_layout->plh_layouts);
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spin_unlock(&clp->cl_lock);
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2011-01-06 04:36:30 -07:00
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clear_bit(NFS_LAYOUT_BULK_RECALL, &lseg->pls_layout->plh_flags);
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2011-01-06 04:36:23 -07:00
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}
|
2011-01-06 04:36:32 -07:00
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rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq);
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2011-01-06 04:36:23 -07:00
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list_add(&lseg->pls_list, tmp_list);
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return 1;
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|
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}
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return 0;
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|
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}
|
2010-10-19 22:18:02 -06:00
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|
2011-01-06 04:36:23 -07:00
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static bool
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should_free_lseg(u32 lseg_iomode, u32 recall_iomode)
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|
|
|
{
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|
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return (recall_iomode == IOMODE_ANY ||
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|
|
lseg_iomode == recall_iomode);
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:23 -07:00
|
|
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/* Returns 1 if lseg is removed from list, 0 otherwise */
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static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
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|
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struct list_head *tmp_list)
|
|
|
|
{
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|
|
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int rv = 0;
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|
|
|
|
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|
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if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
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|
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/* Remove the reference keeping the lseg in the
|
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|
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* list. It will now be removed when all
|
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|
|
* outstanding io is finished.
|
|
|
|
*/
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|
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rv = put_lseg_locked(lseg, tmp_list);
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|
|
}
|
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|
|
return rv;
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|
|
|
}
|
|
|
|
|
|
|
|
/* Returns count of number of matching invalid lsegs remaining in list
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|
|
|
* after call.
|
|
|
|
*/
|
2011-01-06 04:36:30 -07:00
|
|
|
int
|
2011-01-06 04:36:23 -07:00
|
|
|
mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
|
|
|
|
struct list_head *tmp_list,
|
|
|
|
u32 iomode)
|
2010-10-19 22:18:02 -06:00
|
|
|
{
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|
|
|
struct pnfs_layout_segment *lseg, *next;
|
2011-01-06 04:36:23 -07:00
|
|
|
int invalid = 0, removed = 0;
|
2010-10-19 22:18:02 -06:00
|
|
|
|
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|
|
dprintk("%s:Begin lo %p\n", __func__, lo);
|
|
|
|
|
2011-01-06 04:36:23 -07:00
|
|
|
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
|
|
|
|
if (should_free_lseg(lseg->pls_range.iomode, iomode)) {
|
|
|
|
dprintk("%s: freeing lseg %p iomode %d "
|
|
|
|
"offset %llu length %llu\n", __func__,
|
|
|
|
lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
|
|
|
|
lseg->pls_range.length);
|
|
|
|
invalid++;
|
|
|
|
removed += mark_lseg_invalid(lseg, tmp_list);
|
|
|
|
}
|
|
|
|
dprintk("%s:Return %i\n", __func__, invalid - removed);
|
|
|
|
return invalid - removed;
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:30 -07:00
|
|
|
void
|
2011-01-06 04:36:23 -07:00
|
|
|
pnfs_free_lseg_list(struct list_head *free_me)
|
2010-10-19 22:18:02 -06:00
|
|
|
{
|
2011-01-06 04:36:23 -07:00
|
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
2010-10-19 22:18:02 -06:00
|
|
|
|
2011-01-06 04:36:23 -07:00
|
|
|
list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
|
2011-01-06 04:36:20 -07:00
|
|
|
list_del(&lseg->pls_list);
|
2011-01-06 04:36:23 -07:00
|
|
|
free_lseg(lseg);
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-10-19 22:18:01 -06:00
|
|
|
void
|
|
|
|
pnfs_destroy_layout(struct nfs_inode *nfsi)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
2010-10-19 22:18:02 -06:00
|
|
|
LIST_HEAD(tmp_list);
|
2010-10-19 22:18:01 -06:00
|
|
|
|
|
|
|
spin_lock(&nfsi->vfs_inode.i_lock);
|
|
|
|
lo = nfsi->layout;
|
|
|
|
if (lo) {
|
2011-01-06 04:36:23 -07:00
|
|
|
set_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags);
|
|
|
|
mark_matching_lsegs_invalid(lo, &tmp_list, IOMODE_ANY);
|
2010-10-19 22:18:01 -06:00
|
|
|
/* Matched by refcount set to 1 in alloc_init_layout_hdr */
|
|
|
|
put_layout_hdr_locked(lo);
|
|
|
|
}
|
|
|
|
spin_unlock(&nfsi->vfs_inode.i_lock);
|
2010-10-19 22:18:02 -06:00
|
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the state manger to remove all layouts established under an
|
|
|
|
* expired lease.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
pnfs_destroy_all_layouts(struct nfs_client *clp)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
LIST_HEAD(tmp_list);
|
|
|
|
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
|
|
list_splice_init(&clp->cl_layouts, &tmp_list);
|
|
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
|
|
|
|
while (!list_empty(&tmp_list)) {
|
|
|
|
lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
|
2011-01-06 04:36:21 -07:00
|
|
|
plh_layouts);
|
2010-10-19 22:18:02 -06:00
|
|
|
dprintk("%s freeing layout for inode %lu\n", __func__,
|
2011-01-06 04:36:21 -07:00
|
|
|
lo->plh_inode->i_ino);
|
|
|
|
pnfs_destroy_layout(NFS_I(lo->plh_inode));
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
2010-10-19 22:18:01 -06:00
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:22 -07:00
|
|
|
/* update lo->plh_stateid with new if is more recent */
|
2011-01-06 04:36:30 -07:00
|
|
|
void
|
|
|
|
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
|
|
|
|
bool update_barrier)
|
2010-10-19 22:18:03 -06:00
|
|
|
{
|
2011-01-06 04:36:22 -07:00
|
|
|
u32 oldseq, newseq;
|
2010-10-19 22:18:03 -06:00
|
|
|
|
2011-01-06 04:36:22 -07:00
|
|
|
oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
|
|
|
|
newseq = be32_to_cpu(new->stateid.seqid);
|
2011-01-06 04:36:30 -07:00
|
|
|
if ((int)(newseq - oldseq) > 0) {
|
2011-01-06 04:36:22 -07:00
|
|
|
memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
|
2011-01-06 04:36:30 -07:00
|
|
|
if (update_barrier) {
|
|
|
|
u32 new_barrier = be32_to_cpu(new->stateid.seqid);
|
|
|
|
|
|
|
|
if ((int)(new_barrier - lo->plh_barrier))
|
|
|
|
lo->plh_barrier = new_barrier;
|
|
|
|
} else {
|
|
|
|
/* Because of wraparound, we want to keep the barrier
|
|
|
|
* "close" to the current seqids. It needs to be
|
|
|
|
* within 2**31 to count as "behind", so if it
|
|
|
|
* gets too near that limit, give us a litle leeway
|
|
|
|
* and bring it to within 2**30.
|
|
|
|
* NOTE - and yes, this is all unsigned arithmetic.
|
|
|
|
*/
|
|
|
|
if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
|
|
|
|
lo->plh_barrier = newseq - (1 << 30);
|
|
|
|
}
|
|
|
|
}
|
2010-10-19 22:18:03 -06:00
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:25 -07:00
|
|
|
/* lget is set to 1 if called from inside send_layoutget call chain */
|
|
|
|
static bool
|
2011-01-06 04:36:30 -07:00
|
|
|
pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
|
|
|
|
int lget)
|
|
|
|
{
|
|
|
|
if ((stateid) &&
|
|
|
|
(int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0)
|
|
|
|
return true;
|
2011-01-06 04:36:32 -07:00
|
|
|
return lo->plh_block_lgets ||
|
|
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
|
2011-01-06 04:36:30 -07:00
|
|
|
(list_empty(&lo->plh_segs) &&
|
2011-01-06 04:36:25 -07:00
|
|
|
(atomic_read(&lo->plh_outstanding) > lget));
|
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:22 -07:00
|
|
|
int
|
|
|
|
pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
|
|
|
|
struct nfs4_state *open_state)
|
2010-10-19 22:18:03 -06:00
|
|
|
{
|
2011-01-06 04:36:22 -07:00
|
|
|
int status = 0;
|
2010-10-19 22:18:02 -06:00
|
|
|
|
2010-10-19 22:18:03 -06:00
|
|
|
dprintk("--> %s\n", __func__);
|
2011-01-06 04:36:22 -07:00
|
|
|
spin_lock(&lo->plh_inode->i_lock);
|
2011-01-06 04:36:30 -07:00
|
|
|
if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
|
2011-01-06 04:36:25 -07:00
|
|
|
status = -EAGAIN;
|
|
|
|
} else if (list_empty(&lo->plh_segs)) {
|
2011-01-06 04:36:22 -07:00
|
|
|
int seq;
|
|
|
|
|
|
|
|
do {
|
|
|
|
seq = read_seqbegin(&open_state->seqlock);
|
|
|
|
memcpy(dst->data, open_state->stateid.data,
|
|
|
|
sizeof(open_state->stateid.data));
|
|
|
|
} while (read_seqretry(&open_state->seqlock, seq));
|
|
|
|
} else
|
|
|
|
memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
|
|
|
|
spin_unlock(&lo->plh_inode->i_lock);
|
2010-10-19 22:18:03 -06:00
|
|
|
dprintk("<-- %s\n", __func__);
|
2011-01-06 04:36:22 -07:00
|
|
|
return status;
|
2010-10-19 22:18:03 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get layout from server.
|
|
|
|
* for now, assume that whole file layouts are requested.
|
|
|
|
* arg->offset: 0
|
|
|
|
* arg->length: all ones
|
|
|
|
*/
|
2010-10-19 22:18:01 -06:00
|
|
|
static struct pnfs_layout_segment *
|
|
|
|
send_layoutget(struct pnfs_layout_hdr *lo,
|
|
|
|
struct nfs_open_context *ctx,
|
|
|
|
u32 iomode)
|
|
|
|
{
|
2011-01-06 04:36:21 -07:00
|
|
|
struct inode *ino = lo->plh_inode;
|
2010-10-19 22:18:03 -06:00
|
|
|
struct nfs_server *server = NFS_SERVER(ino);
|
|
|
|
struct nfs4_layoutget *lgp;
|
|
|
|
struct pnfs_layout_segment *lseg = NULL;
|
|
|
|
|
|
|
|
dprintk("--> %s\n", __func__);
|
2010-10-19 22:18:01 -06:00
|
|
|
|
2010-10-19 22:18:03 -06:00
|
|
|
BUG_ON(ctx == NULL);
|
|
|
|
lgp = kzalloc(sizeof(*lgp), GFP_KERNEL);
|
2011-01-06 04:36:25 -07:00
|
|
|
if (lgp == NULL)
|
2010-10-19 22:18:03 -06:00
|
|
|
return NULL;
|
|
|
|
lgp->args.minlength = NFS4_MAX_UINT64;
|
|
|
|
lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
|
|
|
|
lgp->args.range.iomode = iomode;
|
|
|
|
lgp->args.range.offset = 0;
|
|
|
|
lgp->args.range.length = NFS4_MAX_UINT64;
|
|
|
|
lgp->args.type = server->pnfs_curr_ld->id;
|
|
|
|
lgp->args.inode = ino;
|
|
|
|
lgp->args.ctx = get_nfs_open_context(ctx);
|
|
|
|
lgp->lsegpp = &lseg;
|
|
|
|
|
|
|
|
/* Synchronously retrieve layout information from server and
|
|
|
|
* store in lseg.
|
|
|
|
*/
|
|
|
|
nfs4_proc_layoutget(lgp);
|
2010-10-19 22:18:02 -06:00
|
|
|
if (!lseg) {
|
2010-10-19 22:18:03 -06:00
|
|
|
/* remember that LAYOUTGET failed and suspend trying */
|
2011-01-06 04:36:20 -07:00
|
|
|
set_bit(lo_fail_bit(iomode), &lo->plh_flags);
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
|
|
|
return lseg;
|
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:32 -07:00
|
|
|
bool pnfs_roc(struct inode *ino)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
|
|
LIST_HEAD(tmp_list);
|
|
|
|
bool found = false;
|
|
|
|
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
lo = NFS_I(ino)->layout;
|
|
|
|
if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
|
|
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
|
|
|
|
goto out_nolayout;
|
|
|
|
list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
|
|
|
|
if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
|
|
|
|
mark_lseg_invalid(lseg, &tmp_list);
|
|
|
|
found = true;
|
|
|
|
}
|
|
|
|
if (!found)
|
|
|
|
goto out_nolayout;
|
|
|
|
lo->plh_block_lgets++;
|
|
|
|
get_layout_hdr(lo); /* matched in pnfs_roc_release */
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
|
|
return true;
|
|
|
|
|
|
|
|
out_nolayout:
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
void pnfs_roc_release(struct inode *ino)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
lo = NFS_I(ino)->layout;
|
|
|
|
lo->plh_block_lgets--;
|
|
|
|
put_layout_hdr_locked(lo);
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
lo = NFS_I(ino)->layout;
|
|
|
|
if ((int)(barrier - lo->plh_barrier) > 0)
|
|
|
|
lo->plh_barrier = barrier;
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
|
|
|
|
{
|
|
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
|
|
struct pnfs_layout_segment *lseg;
|
|
|
|
bool found = false;
|
|
|
|
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
|
|
|
|
if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
|
|
|
|
found = true;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!found) {
|
|
|
|
struct pnfs_layout_hdr *lo = nfsi->layout;
|
|
|
|
u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid);
|
|
|
|
|
|
|
|
/* Since close does not return a layout stateid for use as
|
|
|
|
* a barrier, we choose the worst-case barrier.
|
|
|
|
*/
|
|
|
|
*barrier = current_seqid + atomic_read(&lo->plh_outstanding);
|
|
|
|
}
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
return found;
|
|
|
|
}
|
|
|
|
|
2010-10-19 22:18:03 -06:00
|
|
|
/*
|
|
|
|
* Compare two layout segments for sorting into layout cache.
|
|
|
|
* We want to preferentially return RW over RO layouts, so ensure those
|
|
|
|
* are seen first.
|
|
|
|
*/
|
|
|
|
static s64
|
|
|
|
cmp_layout(u32 iomode1, u32 iomode2)
|
|
|
|
{
|
|
|
|
/* read > read/write */
|
|
|
|
return (int)(iomode2 == IOMODE_READ) - (int)(iomode1 == IOMODE_READ);
|
|
|
|
}
|
|
|
|
|
2010-10-19 22:18:02 -06:00
|
|
|
static void
|
|
|
|
pnfs_insert_layout(struct pnfs_layout_hdr *lo,
|
|
|
|
struct pnfs_layout_segment *lseg)
|
|
|
|
{
|
2010-10-19 22:18:03 -06:00
|
|
|
struct pnfs_layout_segment *lp;
|
|
|
|
int found = 0;
|
|
|
|
|
2010-10-19 22:18:02 -06:00
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
|
2011-01-06 04:36:21 -07:00
|
|
|
assert_spin_locked(&lo->plh_inode->i_lock);
|
|
|
|
list_for_each_entry(lp, &lo->plh_segs, pls_list) {
|
2011-01-06 04:36:20 -07:00
|
|
|
if (cmp_layout(lp->pls_range.iomode, lseg->pls_range.iomode) > 0)
|
2010-10-19 22:18:03 -06:00
|
|
|
continue;
|
2011-01-06 04:36:20 -07:00
|
|
|
list_add_tail(&lseg->pls_list, &lp->pls_list);
|
2010-10-19 22:18:03 -06:00
|
|
|
dprintk("%s: inserted lseg %p "
|
|
|
|
"iomode %d offset %llu length %llu before "
|
|
|
|
"lp %p iomode %d offset %llu length %llu\n",
|
2011-01-06 04:36:20 -07:00
|
|
|
__func__, lseg, lseg->pls_range.iomode,
|
|
|
|
lseg->pls_range.offset, lseg->pls_range.length,
|
|
|
|
lp, lp->pls_range.iomode, lp->pls_range.offset,
|
|
|
|
lp->pls_range.length);
|
2010-10-19 22:18:03 -06:00
|
|
|
found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!found) {
|
2011-01-06 04:36:21 -07:00
|
|
|
list_add_tail(&lseg->pls_list, &lo->plh_segs);
|
2010-10-19 22:18:03 -06:00
|
|
|
dprintk("%s: inserted lseg %p "
|
|
|
|
"iomode %d offset %llu length %llu at tail\n",
|
2011-01-06 04:36:20 -07:00
|
|
|
__func__, lseg, lseg->pls_range.iomode,
|
|
|
|
lseg->pls_range.offset, lseg->pls_range.length);
|
2010-10-19 22:18:02 -06:00
|
|
|
}
|
2011-01-06 04:36:28 -07:00
|
|
|
get_layout_hdr(lo);
|
2010-10-19 22:18:02 -06:00
|
|
|
|
|
|
|
dprintk("%s:Return\n", __func__);
|
2010-10-19 22:18:01 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct pnfs_layout_hdr *
|
|
|
|
alloc_init_layout_hdr(struct inode *ino)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
|
|
|
|
lo = kzalloc(sizeof(struct pnfs_layout_hdr), GFP_KERNEL);
|
|
|
|
if (!lo)
|
|
|
|
return NULL;
|
2011-01-06 04:36:28 -07:00
|
|
|
atomic_set(&lo->plh_refcount, 1);
|
2011-01-06 04:36:21 -07:00
|
|
|
INIT_LIST_HEAD(&lo->plh_layouts);
|
|
|
|
INIT_LIST_HEAD(&lo->plh_segs);
|
2011-01-06 04:36:30 -07:00
|
|
|
INIT_LIST_HEAD(&lo->plh_bulk_recall);
|
2011-01-06 04:36:21 -07:00
|
|
|
lo->plh_inode = ino;
|
2010-10-19 22:18:01 -06:00
|
|
|
return lo;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct pnfs_layout_hdr *
|
|
|
|
pnfs_find_alloc_layout(struct inode *ino)
|
|
|
|
{
|
|
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
|
|
struct pnfs_layout_hdr *new = NULL;
|
|
|
|
|
|
|
|
dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
|
|
|
|
|
|
|
|
assert_spin_locked(&ino->i_lock);
|
2011-01-06 04:36:23 -07:00
|
|
|
if (nfsi->layout) {
|
|
|
|
if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
|
|
|
|
return NULL;
|
|
|
|
else
|
|
|
|
return nfsi->layout;
|
|
|
|
}
|
2010-10-19 22:18:01 -06:00
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
new = alloc_init_layout_hdr(ino);
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
|
|
|
|
if (likely(nfsi->layout == NULL)) /* Won the race? */
|
|
|
|
nfsi->layout = new;
|
|
|
|
else
|
|
|
|
kfree(new);
|
|
|
|
return nfsi->layout;
|
|
|
|
}
|
|
|
|
|
2010-10-19 22:18:03 -06:00
|
|
|
/*
|
|
|
|
* iomode matching rules:
|
|
|
|
* iomode lseg match
|
|
|
|
* ----- ----- -----
|
|
|
|
* ANY READ true
|
|
|
|
* ANY RW true
|
|
|
|
* RW READ false
|
|
|
|
* RW RW true
|
|
|
|
* READ READ true
|
|
|
|
* READ RW true
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
is_matching_lseg(struct pnfs_layout_segment *lseg, u32 iomode)
|
|
|
|
{
|
2011-01-06 04:36:20 -07:00
|
|
|
return (iomode != IOMODE_RW || lseg->pls_range.iomode == IOMODE_RW);
|
2010-10-19 22:18:03 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* lookup range in layout
|
|
|
|
*/
|
2010-10-19 22:18:01 -06:00
|
|
|
static struct pnfs_layout_segment *
|
2011-01-06 04:36:30 -07:00
|
|
|
pnfs_find_lseg(struct pnfs_layout_hdr *lo, u32 iomode)
|
2010-10-19 22:18:01 -06:00
|
|
|
{
|
2010-10-19 22:18:03 -06:00
|
|
|
struct pnfs_layout_segment *lseg, *ret = NULL;
|
|
|
|
|
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
|
2011-01-06 04:36:21 -07:00
|
|
|
assert_spin_locked(&lo->plh_inode->i_lock);
|
|
|
|
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
|
2011-01-06 04:36:23 -07:00
|
|
|
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
|
|
|
|
is_matching_lseg(lseg, iomode)) {
|
2010-10-19 22:18:03 -06:00
|
|
|
ret = lseg;
|
|
|
|
break;
|
|
|
|
}
|
2011-01-06 04:36:20 -07:00
|
|
|
if (cmp_layout(iomode, lseg->pls_range.iomode) > 0)
|
2010-10-19 22:18:03 -06:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
dprintk("%s:Return lseg %p ref %d\n",
|
2011-01-06 04:36:23 -07:00
|
|
|
__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
|
2010-10-19 22:18:03 -06:00
|
|
|
return ret;
|
2010-10-19 22:18:01 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Layout segment is retreived from the server if not cached.
|
|
|
|
* The appropriate layout segment is referenced and returned to the caller.
|
|
|
|
*/
|
|
|
|
struct pnfs_layout_segment *
|
|
|
|
pnfs_update_layout(struct inode *ino,
|
|
|
|
struct nfs_open_context *ctx,
|
|
|
|
enum pnfs_iomode iomode)
|
|
|
|
{
|
|
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
2011-01-06 04:36:26 -07:00
|
|
|
struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
|
2010-10-19 22:18:01 -06:00
|
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
struct pnfs_layout_segment *lseg = NULL;
|
|
|
|
|
|
|
|
if (!pnfs_enabled_sb(NFS_SERVER(ino)))
|
|
|
|
return NULL;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
lo = pnfs_find_alloc_layout(ino);
|
|
|
|
if (lo == NULL) {
|
|
|
|
dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
|
2011-01-06 04:36:30 -07:00
|
|
|
/* Do we even need to bother with this? */
|
|
|
|
if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
|
|
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
|
|
|
|
dprintk("%s matches recall, use MDS\n", __func__);
|
2010-10-19 22:18:01 -06:00
|
|
|
goto out_unlock;
|
|
|
|
}
|
2011-01-06 04:36:30 -07:00
|
|
|
/* Check to see if the layout for the given range already exists */
|
|
|
|
lseg = pnfs_find_lseg(lo, iomode);
|
|
|
|
if (lseg)
|
|
|
|
goto out_unlock;
|
2010-10-19 22:18:01 -06:00
|
|
|
|
|
|
|
/* if LAYOUTGET already failed once we don't try again */
|
2011-01-06 04:36:20 -07:00
|
|
|
if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
|
2010-10-19 22:18:01 -06:00
|
|
|
goto out_unlock;
|
|
|
|
|
2011-01-06 04:36:30 -07:00
|
|
|
if (pnfs_layoutgets_blocked(lo, NULL, 0))
|
2011-01-06 04:36:25 -07:00
|
|
|
goto out_unlock;
|
|
|
|
atomic_inc(&lo->plh_outstanding);
|
|
|
|
|
2011-01-06 04:36:28 -07:00
|
|
|
get_layout_hdr(lo);
|
2011-01-06 04:36:26 -07:00
|
|
|
if (list_empty(&lo->plh_segs)) {
|
|
|
|
/* The lo must be on the clp list if there is any
|
|
|
|
* chance of a CB_LAYOUTRECALL(FILE) coming in.
|
|
|
|
*/
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
|
|
BUG_ON(!list_empty(&lo->plh_layouts));
|
|
|
|
list_add_tail(&lo->plh_layouts, &clp->cl_layouts);
|
|
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
}
|
2010-10-19 22:18:01 -06:00
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
|
|
|
|
lseg = send_layoutget(lo, ctx, iomode);
|
2011-01-06 04:36:26 -07:00
|
|
|
if (!lseg) {
|
|
|
|
spin_lock(&ino->i_lock);
|
|
|
|
if (list_empty(&lo->plh_segs)) {
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
|
|
list_del_init(&lo->plh_layouts);
|
|
|
|
spin_unlock(&clp->cl_lock);
|
2011-01-06 04:36:30 -07:00
|
|
|
clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
|
2011-01-06 04:36:26 -07:00
|
|
|
}
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
}
|
2011-01-06 04:36:25 -07:00
|
|
|
atomic_dec(&lo->plh_outstanding);
|
2011-01-06 04:36:28 -07:00
|
|
|
put_layout_hdr(lo);
|
2010-10-19 22:18:01 -06:00
|
|
|
out:
|
|
|
|
dprintk("%s end, state 0x%lx lseg %p\n", __func__,
|
2011-01-06 04:36:20 -07:00
|
|
|
nfsi->layout->plh_flags, lseg);
|
2010-10-19 22:18:01 -06:00
|
|
|
return lseg;
|
|
|
|
out_unlock:
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
goto out;
|
|
|
|
}
|
2010-10-19 22:18:03 -06:00
|
|
|
|
|
|
|
int
|
|
|
|
pnfs_layout_process(struct nfs4_layoutget *lgp)
|
|
|
|
{
|
|
|
|
struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
|
|
|
|
struct nfs4_layoutget_res *res = &lgp->res;
|
|
|
|
struct pnfs_layout_segment *lseg;
|
2011-01-06 04:36:21 -07:00
|
|
|
struct inode *ino = lo->plh_inode;
|
2011-01-06 04:36:30 -07:00
|
|
|
struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
|
2010-10-19 22:18:03 -06:00
|
|
|
int status = 0;
|
|
|
|
|
2011-01-06 04:36:27 -07:00
|
|
|
/* Verify we got what we asked for.
|
|
|
|
* Note that because the xdr parsing only accepts a single
|
|
|
|
* element array, this can fail even if the server is behaving
|
|
|
|
* correctly.
|
|
|
|
*/
|
|
|
|
if (lgp->args.range.iomode > res->range.iomode ||
|
|
|
|
res->range.offset != 0 ||
|
|
|
|
res->range.length != NFS4_MAX_UINT64) {
|
|
|
|
status = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
2010-10-19 22:18:03 -06:00
|
|
|
/* Inject layout blob into I/O device driver */
|
|
|
|
lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res);
|
|
|
|
if (!lseg || IS_ERR(lseg)) {
|
|
|
|
if (!lseg)
|
|
|
|
status = -ENOMEM;
|
|
|
|
else
|
|
|
|
status = PTR_ERR(lseg);
|
|
|
|
dprintk("%s: Could not allocate layout: error %d\n",
|
|
|
|
__func__, status);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock(&ino->i_lock);
|
2011-01-06 04:36:30 -07:00
|
|
|
if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
|
|
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
|
|
|
|
dprintk("%s forget reply due to recall\n", __func__);
|
|
|
|
goto out_forget_reply;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
|
|
|
|
dprintk("%s forget reply due to state\n", __func__);
|
|
|
|
goto out_forget_reply;
|
|
|
|
}
|
2010-10-19 22:18:03 -06:00
|
|
|
init_lseg(lo, lseg);
|
2011-01-06 04:36:20 -07:00
|
|
|
lseg->pls_range = res->range;
|
2010-10-19 22:18:03 -06:00
|
|
|
*lgp->lsegpp = lseg;
|
|
|
|
pnfs_insert_layout(lo, lseg);
|
|
|
|
|
2011-01-06 04:36:32 -07:00
|
|
|
if (res->return_on_close) {
|
|
|
|
set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
|
|
|
|
set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
|
|
|
|
}
|
|
|
|
|
2010-10-19 22:18:03 -06:00
|
|
|
/* Done processing layoutget. Set the layout stateid */
|
2011-01-06 04:36:30 -07:00
|
|
|
pnfs_set_layout_stateid(lo, &res->stateid, false);
|
2010-10-19 22:18:03 -06:00
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
out:
|
|
|
|
return status;
|
2011-01-06 04:36:30 -07:00
|
|
|
|
|
|
|
out_forget_reply:
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
lseg->pls_layout = lo;
|
|
|
|
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
|
|
|
|
goto out;
|
2010-10-19 22:18:03 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Device ID cache. Currently supports one layout type per struct nfs_client.
|
|
|
|
* Add layout type to the lookup key to expand to support multiple types.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
pnfs_alloc_init_deviceid_cache(struct nfs_client *clp,
|
|
|
|
void (*free_callback)(struct pnfs_deviceid_node *))
|
|
|
|
{
|
|
|
|
struct pnfs_deviceid_cache *c;
|
|
|
|
|
|
|
|
c = kzalloc(sizeof(struct pnfs_deviceid_cache), GFP_KERNEL);
|
|
|
|
if (!c)
|
|
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
|
|
if (clp->cl_devid_cache != NULL) {
|
|
|
|
atomic_inc(&clp->cl_devid_cache->dc_ref);
|
|
|
|
dprintk("%s [kref [%d]]\n", __func__,
|
|
|
|
atomic_read(&clp->cl_devid_cache->dc_ref));
|
|
|
|
kfree(c);
|
|
|
|
} else {
|
|
|
|
/* kzalloc initializes hlists */
|
|
|
|
spin_lock_init(&c->dc_lock);
|
|
|
|
atomic_set(&c->dc_ref, 1);
|
|
|
|
c->dc_free_callback = free_callback;
|
|
|
|
clp->cl_devid_cache = c;
|
|
|
|
dprintk("%s [new]\n", __func__);
|
|
|
|
}
|
|
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(pnfs_alloc_init_deviceid_cache);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called from pnfs_layoutdriver_type->free_lseg
|
|
|
|
* last layout segment reference frees deviceid
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
|
|
|
|
struct pnfs_deviceid_node *devid)
|
|
|
|
{
|
|
|
|
struct nfs4_deviceid *id = &devid->de_id;
|
|
|
|
struct pnfs_deviceid_node *d;
|
|
|
|
struct hlist_node *n;
|
|
|
|
long h = nfs4_deviceid_hash(id);
|
|
|
|
|
|
|
|
dprintk("%s [%d]\n", __func__, atomic_read(&devid->de_ref));
|
|
|
|
if (!atomic_dec_and_lock(&devid->de_ref, &c->dc_lock))
|
|
|
|
return;
|
|
|
|
|
|
|
|
hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[h], de_node)
|
|
|
|
if (!memcmp(&d->de_id, id, sizeof(*id))) {
|
|
|
|
hlist_del_rcu(&d->de_node);
|
|
|
|
spin_unlock(&c->dc_lock);
|
|
|
|
synchronize_rcu();
|
|
|
|
c->dc_free_callback(devid);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
spin_unlock(&c->dc_lock);
|
|
|
|
/* Why wasn't it found in the list? */
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(pnfs_put_deviceid);
|
|
|
|
|
|
|
|
/* Find and reference a deviceid */
|
|
|
|
struct pnfs_deviceid_node *
|
|
|
|
pnfs_find_get_deviceid(struct pnfs_deviceid_cache *c, struct nfs4_deviceid *id)
|
|
|
|
{
|
|
|
|
struct pnfs_deviceid_node *d;
|
|
|
|
struct hlist_node *n;
|
|
|
|
long hash = nfs4_deviceid_hash(id);
|
|
|
|
|
|
|
|
dprintk("--> %s hash %ld\n", __func__, hash);
|
|
|
|
rcu_read_lock();
|
|
|
|
hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[hash], de_node) {
|
|
|
|
if (!memcmp(&d->de_id, id, sizeof(*id))) {
|
|
|
|
if (!atomic_inc_not_zero(&d->de_ref)) {
|
|
|
|
goto fail;
|
|
|
|
} else {
|
|
|
|
rcu_read_unlock();
|
|
|
|
return d;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
fail:
|
|
|
|
rcu_read_unlock();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(pnfs_find_get_deviceid);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Add a deviceid to the cache.
|
|
|
|
* GETDEVICEINFOs for same deviceid can race. If deviceid is found, discard new
|
|
|
|
*/
|
|
|
|
struct pnfs_deviceid_node *
|
|
|
|
pnfs_add_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *new)
|
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{
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struct pnfs_deviceid_node *d;
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long hash = nfs4_deviceid_hash(&new->de_id);
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dprintk("--> %s hash %ld\n", __func__, hash);
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spin_lock(&c->dc_lock);
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d = pnfs_find_get_deviceid(c, &new->de_id);
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if (d) {
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spin_unlock(&c->dc_lock);
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dprintk("%s [discard]\n", __func__);
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c->dc_free_callback(new);
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return d;
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}
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INIT_HLIST_NODE(&new->de_node);
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atomic_set(&new->de_ref, 1);
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hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
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spin_unlock(&c->dc_lock);
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dprintk("%s [new]\n", __func__);
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return new;
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}
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EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
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void
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pnfs_put_deviceid_cache(struct nfs_client *clp)
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{
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struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
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dprintk("--> %s cl_devid_cache %p\n", __func__, clp->cl_devid_cache);
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if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
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int i;
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/* Verify cache is empty */
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for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
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BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
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clp->cl_devid_cache = NULL;
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spin_unlock(&clp->cl_lock);
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kfree(local);
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}
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}
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EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);
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