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Linux/fs/fscache/netfs.c

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  1 /* FS-Cache netfs (client) registration
  2  *
  3  * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 
 12 #define FSCACHE_DEBUG_LEVEL COOKIE
 13 #include <linux/module.h>
 14 #include <linux/slab.h>
 15 #include "internal.h"
 16 
 17 static LIST_HEAD(fscache_netfs_list);
 18 
 19 /*
 20  * register a network filesystem for caching
 21  */
 22 int __fscache_register_netfs(struct fscache_netfs *netfs)
 23 {
 24         struct fscache_netfs *ptr;
 25         struct fscache_cookie *cookie;
 26         int ret;
 27 
 28         _enter("{%s}", netfs->name);
 29 
 30         INIT_LIST_HEAD(&netfs->link);
 31 
 32         /* allocate a cookie for the primary index */
 33         cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
 34 
 35         if (!cookie) {
 36                 _leave(" = -ENOMEM");
 37                 return -ENOMEM;
 38         }
 39 
 40         /* initialise the primary index cookie */
 41         atomic_set(&cookie->usage, 1);
 42         atomic_set(&cookie->n_children, 0);
 43         atomic_set(&cookie->n_active, 1);
 44 
 45         cookie->def             = &fscache_fsdef_netfs_def;
 46         cookie->parent          = &fscache_fsdef_index;
 47         cookie->netfs_data      = netfs;
 48         cookie->flags           = 1 << FSCACHE_COOKIE_ENABLED;
 49 
 50         spin_lock_init(&cookie->lock);
 51         INIT_HLIST_HEAD(&cookie->backing_objects);
 52 
 53         /* check the netfs type is not already present */
 54         down_write(&fscache_addremove_sem);
 55 
 56         ret = -EEXIST;
 57         list_for_each_entry(ptr, &fscache_netfs_list, link) {
 58                 if (strcmp(ptr->name, netfs->name) == 0)
 59                         goto already_registered;
 60         }
 61 
 62         atomic_inc(&cookie->parent->usage);
 63         atomic_inc(&cookie->parent->n_children);
 64 
 65         netfs->primary_index = cookie;
 66         list_add(&netfs->link, &fscache_netfs_list);
 67         ret = 0;
 68 
 69         printk(KERN_NOTICE "FS-Cache: Netfs '%s' registered for caching\n",
 70                netfs->name);
 71 
 72 already_registered:
 73         up_write(&fscache_addremove_sem);
 74 
 75         if (ret < 0)
 76                 kmem_cache_free(fscache_cookie_jar, cookie);
 77 
 78         _leave(" = %d", ret);
 79         return ret;
 80 }
 81 EXPORT_SYMBOL(__fscache_register_netfs);
 82 
 83 /*
 84  * unregister a network filesystem from the cache
 85  * - all cookies must have been released first
 86  */
 87 void __fscache_unregister_netfs(struct fscache_netfs *netfs)
 88 {
 89         _enter("{%s.%u}", netfs->name, netfs->version);
 90 
 91         down_write(&fscache_addremove_sem);
 92 
 93         list_del(&netfs->link);
 94         fscache_relinquish_cookie(netfs->primary_index, 0);
 95 
 96         up_write(&fscache_addremove_sem);
 97 
 98         printk(KERN_NOTICE "FS-Cache: Netfs '%s' unregistered from caching\n",
 99                netfs->name);
100 
101         _leave("");
102 }
103 EXPORT_SYMBOL(__fscache_unregister_netfs);
104 

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