4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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32 * Lustre is a trademark of Sun Microsystems, Inc.
36 # define EXPORT_SYMTAB
38 #define DEBUG_SUBSYSTEM S_FILTER
41 #include <linux/jbd.h>
42 #include <linux/module.h>
43 #include <linux/kmod.h>
44 #include <linux/slab.h>
45 #include <libcfs/libcfs.h>
46 #include <lustre_fsfilt.h>
48 CFS_LIST_HEAD(fsfilt_types);
50 static struct fsfilt_operations *fsfilt_search_type(const char *type)
52 struct fsfilt_operations *found;
55 cfs_list_for_each(p, &fsfilt_types) {
56 found = cfs_list_entry(p, struct fsfilt_operations, fs_list);
57 if (!strcmp(found->fs_type, type)) {
64 int fsfilt_register_ops(struct fsfilt_operations *fs_ops)
66 struct fsfilt_operations *found;
68 /* lock fsfilt_types list */
69 if ((found = fsfilt_search_type(fs_ops->fs_type))) {
70 if (found != fs_ops) {
71 CERROR("different operations for type %s\n",
73 /* unlock fsfilt_types list */
78 cfs_list_add(&fs_ops->fs_list, &fsfilt_types);
81 /* unlock fsfilt_types list */
85 void fsfilt_unregister_ops(struct fsfilt_operations *fs_ops)
89 /* lock fsfilt_types list */
90 cfs_list_for_each(p, &fsfilt_types) {
91 struct fsfilt_operations *found;
93 found = cfs_list_entry(p, typeof(*found), fs_list);
94 if (found == fs_ops) {
100 /* unlock fsfilt_types list */
103 struct fsfilt_operations *fsfilt_get_ops(const char *type)
105 struct fsfilt_operations *fs_ops;
107 /* lock fsfilt_types list */
108 if (!(fs_ops = fsfilt_search_type(type))) {
112 snprintf(name, sizeof(name) - 1, "fsfilt_%s", type);
113 name[sizeof(name) - 1] = '\0';
115 if (!(rc = cfs_request_module("%s", name))) {
116 fs_ops = fsfilt_search_type(type);
117 CDEBUG(D_INFO, "Loaded module '%s'\n", name);
123 CERROR("Can't find %s interface\n", name);
124 RETURN(ERR_PTR(rc < 0 ? rc : -rc));
125 /* unlock fsfilt_types list */
128 cfs_try_module_get(fs_ops->fs_owner);
129 /* unlock fsfilt_types list */
134 void fsfilt_put_ops(struct fsfilt_operations *fs_ops)
136 cfs_module_put(fs_ops->fs_owner);
140 EXPORT_SYMBOL(fsfilt_register_ops);
141 EXPORT_SYMBOL(fsfilt_unregister_ops);
142 EXPORT_SYMBOL(fsfilt_get_ops);
143 EXPORT_SYMBOL(fsfilt_put_ops);