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1c787096fc
The initialize_mountpoint/uninitialise_mountpoint functions are really about setting or clearing the layout driver to be used on this filesystem. Change the names to the more descriptive 'set_layoutdriver/clear_layoutdriver'. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
784 lines
20 KiB
C
784 lines
20 KiB
C
/*
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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 "internal.h"
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#include "pnfs.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS
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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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static struct pnfs_layoutdriver_type *
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find_pnfs_driver(u32 id)
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{
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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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}
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void
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unset_pnfs_layoutdriver(struct nfs_server *nfss)
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{
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if (nfss->pnfs_curr_ld) {
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nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
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module_put(nfss->pnfs_curr_ld->owner);
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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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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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server->pnfs_curr_ld = ld_type;
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if (ld_type->set_layoutdriver(server)) {
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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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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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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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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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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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/*
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* pNFS client layout cache
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*/
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static void
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get_layout_hdr_locked(struct pnfs_layout_hdr *lo)
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{
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assert_spin_locked(&lo->inode->i_lock);
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lo->refcount++;
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}
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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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assert_spin_locked(&lo->inode->i_lock);
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BUG_ON(lo->refcount == 0);
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lo->refcount--;
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if (!lo->refcount) {
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dprintk("%s: freeing layout cache %p\n", __func__, lo);
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BUG_ON(!list_empty(&lo->layouts));
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NFS_I(lo->inode)->layout = NULL;
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kfree(lo);
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}
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}
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void
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put_layout_hdr(struct inode *inode)
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{
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spin_lock(&inode->i_lock);
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put_layout_hdr_locked(NFS_I(inode)->layout);
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spin_unlock(&inode->i_lock);
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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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INIT_LIST_HEAD(&lseg->fi_list);
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kref_init(&lseg->kref);
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lseg->layout = lo;
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}
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/* Called without i_lock held, as the free_lseg call may sleep */
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static void
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destroy_lseg(struct kref *kref)
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{
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struct pnfs_layout_segment *lseg =
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container_of(kref, struct pnfs_layout_segment, kref);
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struct inode *ino = lseg->layout->inode;
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dprintk("--> %s\n", __func__);
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NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
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/* Matched by get_layout_hdr_locked in pnfs_insert_layout */
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put_layout_hdr(ino);
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}
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static void
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put_lseg(struct pnfs_layout_segment *lseg)
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{
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if (!lseg)
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return;
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dprintk("%s: lseg %p ref %d\n", __func__, lseg,
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atomic_read(&lseg->kref.refcount));
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kref_put(&lseg->kref, destroy_lseg);
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}
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static void
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pnfs_clear_lseg_list(struct pnfs_layout_hdr *lo, struct list_head *tmp_list)
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{
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struct pnfs_layout_segment *lseg, *next;
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struct nfs_client *clp;
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dprintk("%s:Begin lo %p\n", __func__, lo);
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assert_spin_locked(&lo->inode->i_lock);
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list_for_each_entry_safe(lseg, next, &lo->segs, fi_list) {
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dprintk("%s: freeing lseg %p\n", __func__, lseg);
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list_move(&lseg->fi_list, tmp_list);
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}
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clp = NFS_SERVER(lo->inode)->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(&lo->layouts);
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spin_unlock(&clp->cl_lock);
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write_seqlock(&lo->seqlock);
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clear_bit(NFS_LAYOUT_STATEID_SET, &lo->state);
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write_sequnlock(&lo->seqlock);
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dprintk("%s:Return\n", __func__);
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}
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static void
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pnfs_free_lseg_list(struct list_head *tmp_list)
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{
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struct pnfs_layout_segment *lseg;
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while (!list_empty(tmp_list)) {
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lseg = list_entry(tmp_list->next, struct pnfs_layout_segment,
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fi_list);
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dprintk("%s calling put_lseg on %p\n", __func__, lseg);
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list_del(&lseg->fi_list);
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put_lseg(lseg);
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}
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}
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void
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pnfs_destroy_layout(struct nfs_inode *nfsi)
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{
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struct pnfs_layout_hdr *lo;
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LIST_HEAD(tmp_list);
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spin_lock(&nfsi->vfs_inode.i_lock);
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lo = nfsi->layout;
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if (lo) {
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pnfs_clear_lseg_list(lo, &tmp_list);
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/* Matched by refcount set to 1 in alloc_init_layout_hdr */
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put_layout_hdr_locked(lo);
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}
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spin_unlock(&nfsi->vfs_inode.i_lock);
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pnfs_free_lseg_list(&tmp_list);
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}
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/*
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* Called by the state manger to remove all layouts established under an
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* expired lease.
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*/
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void
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pnfs_destroy_all_layouts(struct nfs_client *clp)
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{
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struct pnfs_layout_hdr *lo;
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LIST_HEAD(tmp_list);
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spin_lock(&clp->cl_lock);
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list_splice_init(&clp->cl_layouts, &tmp_list);
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spin_unlock(&clp->cl_lock);
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while (!list_empty(&tmp_list)) {
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lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
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layouts);
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dprintk("%s freeing layout for inode %lu\n", __func__,
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lo->inode->i_ino);
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pnfs_destroy_layout(NFS_I(lo->inode));
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}
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}
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/* update lo->stateid with new if is more recent
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*
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* lo->stateid could be the open stateid, in which case we just use what given.
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*/
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static void
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pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
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const nfs4_stateid *new)
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{
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nfs4_stateid *old = &lo->stateid;
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bool overwrite = false;
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write_seqlock(&lo->seqlock);
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if (!test_bit(NFS_LAYOUT_STATEID_SET, &lo->state) ||
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memcmp(old->stateid.other, new->stateid.other, sizeof(new->stateid.other)))
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overwrite = true;
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else {
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u32 oldseq, newseq;
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oldseq = be32_to_cpu(old->stateid.seqid);
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newseq = be32_to_cpu(new->stateid.seqid);
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if ((int)(newseq - oldseq) > 0)
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overwrite = true;
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}
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if (overwrite)
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memcpy(&old->stateid, &new->stateid, sizeof(new->stateid));
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write_sequnlock(&lo->seqlock);
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}
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static void
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pnfs_layout_from_open_stateid(struct pnfs_layout_hdr *lo,
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struct nfs4_state *state)
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{
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int seq;
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dprintk("--> %s\n", __func__);
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write_seqlock(&lo->seqlock);
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do {
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seq = read_seqbegin(&state->seqlock);
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memcpy(lo->stateid.data, state->stateid.data,
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sizeof(state->stateid.data));
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} while (read_seqretry(&state->seqlock, seq));
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set_bit(NFS_LAYOUT_STATEID_SET, &lo->state);
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write_sequnlock(&lo->seqlock);
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dprintk("<-- %s\n", __func__);
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}
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void
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pnfs_get_layout_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
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struct nfs4_state *open_state)
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{
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int seq;
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dprintk("--> %s\n", __func__);
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do {
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seq = read_seqbegin(&lo->seqlock);
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if (!test_bit(NFS_LAYOUT_STATEID_SET, &lo->state)) {
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/* This will trigger retry of the read */
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pnfs_layout_from_open_stateid(lo, open_state);
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} else
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memcpy(dst->data, lo->stateid.data,
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sizeof(lo->stateid.data));
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} while (read_seqretry(&lo->seqlock, seq));
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dprintk("<-- %s\n", __func__);
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}
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/*
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* Get layout from server.
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* for now, assume that whole file layouts are requested.
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* arg->offset: 0
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* arg->length: all ones
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*/
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static struct pnfs_layout_segment *
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send_layoutget(struct pnfs_layout_hdr *lo,
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struct nfs_open_context *ctx,
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u32 iomode)
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{
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struct inode *ino = lo->inode;
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struct nfs_server *server = NFS_SERVER(ino);
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struct nfs4_layoutget *lgp;
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struct pnfs_layout_segment *lseg = NULL;
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dprintk("--> %s\n", __func__);
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BUG_ON(ctx == NULL);
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lgp = kzalloc(sizeof(*lgp), GFP_KERNEL);
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if (lgp == NULL) {
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put_layout_hdr(lo->inode);
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return NULL;
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}
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lgp->args.minlength = NFS4_MAX_UINT64;
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lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
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lgp->args.range.iomode = iomode;
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lgp->args.range.offset = 0;
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lgp->args.range.length = NFS4_MAX_UINT64;
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lgp->args.type = server->pnfs_curr_ld->id;
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lgp->args.inode = ino;
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lgp->args.ctx = get_nfs_open_context(ctx);
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lgp->lsegpp = &lseg;
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|
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/* Synchronously retrieve layout information from server and
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* store in lseg.
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*/
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nfs4_proc_layoutget(lgp);
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if (!lseg) {
|
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/* remember that LAYOUTGET failed and suspend trying */
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set_bit(lo_fail_bit(iomode), &lo->state);
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}
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return lseg;
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}
|
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|
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/*
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* Compare two layout segments for sorting into layout cache.
|
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* We want to preferentially return RW over RO layouts, so ensure those
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* are seen first.
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*/
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static s64
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cmp_layout(u32 iomode1, u32 iomode2)
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{
|
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/* read > read/write */
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return (int)(iomode2 == IOMODE_READ) - (int)(iomode1 == IOMODE_READ);
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}
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|
|
static void
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pnfs_insert_layout(struct pnfs_layout_hdr *lo,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_layout_segment *lp;
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int found = 0;
|
|
|
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dprintk("%s:Begin\n", __func__);
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|
|
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assert_spin_locked(&lo->inode->i_lock);
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|
if (list_empty(&lo->segs)) {
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struct nfs_client *clp = NFS_SERVER(lo->inode)->nfs_client;
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|
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spin_lock(&clp->cl_lock);
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BUG_ON(!list_empty(&lo->layouts));
|
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list_add_tail(&lo->layouts, &clp->cl_layouts);
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spin_unlock(&clp->cl_lock);
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}
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list_for_each_entry(lp, &lo->segs, fi_list) {
|
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if (cmp_layout(lp->range.iomode, lseg->range.iomode) > 0)
|
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continue;
|
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list_add_tail(&lseg->fi_list, &lp->fi_list);
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dprintk("%s: inserted lseg %p "
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"iomode %d offset %llu length %llu before "
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"lp %p iomode %d offset %llu length %llu\n",
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__func__, lseg, lseg->range.iomode,
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lseg->range.offset, lseg->range.length,
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lp, lp->range.iomode, lp->range.offset,
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lp->range.length);
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found = 1;
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break;
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}
|
|
if (!found) {
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list_add_tail(&lseg->fi_list, &lo->segs);
|
|
dprintk("%s: inserted lseg %p "
|
|
"iomode %d offset %llu length %llu at tail\n",
|
|
__func__, lseg, lseg->range.iomode,
|
|
lseg->range.offset, lseg->range.length);
|
|
}
|
|
get_layout_hdr_locked(lo);
|
|
|
|
dprintk("%s:Return\n", __func__);
|
|
}
|
|
|
|
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;
|
|
lo->refcount = 1;
|
|
INIT_LIST_HEAD(&lo->layouts);
|
|
INIT_LIST_HEAD(&lo->segs);
|
|
seqlock_init(&lo->seqlock);
|
|
lo->inode = ino;
|
|
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);
|
|
if (nfsi->layout)
|
|
return nfsi->layout;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
return (iomode != IOMODE_RW || lseg->range.iomode == IOMODE_RW);
|
|
}
|
|
|
|
/*
|
|
* lookup range in layout
|
|
*/
|
|
static struct pnfs_layout_segment *
|
|
pnfs_has_layout(struct pnfs_layout_hdr *lo, u32 iomode)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *ret = NULL;
|
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
assert_spin_locked(&lo->inode->i_lock);
|
|
list_for_each_entry(lseg, &lo->segs, fi_list) {
|
|
if (is_matching_lseg(lseg, iomode)) {
|
|
ret = lseg;
|
|
break;
|
|
}
|
|
if (cmp_layout(iomode, lseg->range.iomode) > 0)
|
|
break;
|
|
}
|
|
|
|
dprintk("%s:Return lseg %p ref %d\n",
|
|
__func__, ret, ret ? atomic_read(&ret->kref.refcount) : 0);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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;
|
|
}
|
|
|
|
/* Check to see if the layout for the given range already exists */
|
|
lseg = pnfs_has_layout(lo, iomode);
|
|
if (lseg) {
|
|
dprintk("%s: Using cached lseg %p for iomode %d)\n",
|
|
__func__, lseg, iomode);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* if LAYOUTGET already failed once we don't try again */
|
|
if (test_bit(lo_fail_bit(iomode), &nfsi->layout->state))
|
|
goto out_unlock;
|
|
|
|
get_layout_hdr_locked(lo); /* Matched in nfs4_layoutget_release */
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
lseg = send_layoutget(lo, ctx, iomode);
|
|
out:
|
|
dprintk("%s end, state 0x%lx lseg %p\n", __func__,
|
|
nfsi->layout->state, lseg);
|
|
return lseg;
|
|
out_unlock:
|
|
spin_unlock(&ino->i_lock);
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
struct inode *ino = lo->inode;
|
|
int status = 0;
|
|
|
|
/* 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);
|
|
init_lseg(lo, lseg);
|
|
lseg->range = res->range;
|
|
*lgp->lsegpp = lseg;
|
|
pnfs_insert_layout(lo, lseg);
|
|
|
|
/* Done processing layoutget. Set the layout stateid */
|
|
pnfs_set_layout_stateid(lo, &res->stateid);
|
|
spin_unlock(&ino->i_lock);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct pnfs_deviceid_node *d;
|
|
long hash = nfs4_deviceid_hash(&new->de_id);
|
|
|
|
dprintk("--> %s hash %ld\n", __func__, hash);
|
|
spin_lock(&c->dc_lock);
|
|
d = pnfs_find_get_deviceid(c, &new->de_id);
|
|
if (d) {
|
|
spin_unlock(&c->dc_lock);
|
|
dprintk("%s [discard]\n", __func__);
|
|
c->dc_free_callback(new);
|
|
return d;
|
|
}
|
|
INIT_HLIST_NODE(&new->de_node);
|
|
atomic_set(&new->de_ref, 1);
|
|
hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
|
|
spin_unlock(&c->dc_lock);
|
|
dprintk("%s [new]\n", __func__);
|
|
return new;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
|
|
|
|
void
|
|
pnfs_put_deviceid_cache(struct nfs_client *clp)
|
|
{
|
|
struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
|
|
|
|
dprintk("--> %s cl_devid_cache %p\n", __func__, clp->cl_devid_cache);
|
|
if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
|
|
int i;
|
|
/* Verify cache is empty */
|
|
for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
|
|
BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
|
|
clp->cl_devid_cache = NULL;
|
|
spin_unlock(&clp->cl_lock);
|
|
kfree(local);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);
|