1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2004 Cluster File Systems, Inc.
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define DEBUG_SUBSYSTEM S_SM
27 #include <linux/config.h>
28 #include <linux/module.h>
29 #include <linux/kmod.h>
30 #include <linux/init.h>
32 #include <linux/string.h>
34 #include <linux/utime.h>
35 #include <linux/file.h>
36 #include <linux/slab.h>
37 #include <linux/dcache.h>
38 #include <linux/loop.h>
39 #include <linux/errno.h>
40 #include <linux/obd_class.h>
41 #include <linux/obd_support.h>
42 #include <linux/lustre_lib.h>
43 #include <linux/lustre_idl.h>
44 #include <linux/lustre_fsfilt.h>
45 #include <linux/lustre_smfs.h>
46 #include "smfs_internal.h"
48 static char *smfs_options(char *data, char **devstr, char **namestr,
49 char *opts, int *flags)
51 struct option *opt_value = NULL;
55 LASSERT(opts && flags);
57 while (!(get_opt(&opt_value, &pos))) {
58 if (!strcmp(opt_value->opt, "dev")) {
60 *devstr = opt_value->value;
61 } else if (!strcmp(opt_value->opt, "type")) {
63 *namestr = opt_value->value;
64 } else if (!strcmp(opt_value->opt, "kml")) {
66 } else if (!strcmp(opt_value->opt, "cache")) {
67 *flags |= SM_CACHE_HOOK;
68 } else if (!strcmp(opt_value->opt, "snap")) {
70 } else if (!strcmp(opt_value->opt, "options")) {
71 if (strlen(opts) == 0)
72 sprintf((char *)opts + strlen(opts), "%s",
75 sprintf((char *)opts + strlen(opts), ",%s",
78 /*FIXME:WANGDI How about the opt_value->value*/
79 if (strlen(opts) == 0)
80 sprintf((char *)opts + strlen(opts), "%s",
83 sprintf((char *)opts + strlen(opts), ",%s",
89 static struct smfs_super_info *smfs_init_smb(struct super_block *sb)
91 struct smfs_super_info *smb;
94 OBD_ALLOC(smb, sizeof(*smb));
101 static int smfs_init_fsfilt_ops(struct smfs_super_info *smb)
104 if (!smb->sm_cache_fsfilt) {
105 smb->sm_cache_fsfilt = fsfilt_get_ops(smb->smsi_cache_ftype);
106 if (!smb->sm_cache_fsfilt) {
107 CERROR("Can not get %s fsfilt ops needed by kml\n",
108 smb->smsi_cache_ftype);
112 if (!smb->sm_fsfilt) {
113 smb->sm_fsfilt = fsfilt_get_ops(smb->smsi_ftype);
114 if (!smb->sm_fsfilt) {
115 CERROR("Can not get %s fsfilt ops needed by kml\n",
123 void smfs_cleanup_fsfilt_ops(struct smfs_super_info *smb)
125 if (smb->sm_cache_fsfilt)
126 fsfilt_put_ops(smb->sm_cache_fsfilt);
128 fsfilt_put_ops(smb->sm_fsfilt);
131 static int smfs_mount_cache(struct smfs_super_info *smb, char *devstr,
132 char *typestr, char *opts)
134 int err = 0, typelen;
135 struct vfsmount *mnt;
138 typelen = strlen(typestr);
140 printk("smfs: mounting %s at %s\n", typestr, devstr);
142 mnt = do_kern_mount(typestr, 0, devstr, (void *)opts);
145 CERROR("do_kern_mount failed: rc = %ld\n", PTR_ERR(mnt));
146 GOTO(err_out, err = PTR_ERR(mnt));
149 smb->smsi_sb = mnt->mnt_sb;
152 smfs_init_sm_ops(smb);
154 OBD_ALLOC(smb->smsi_cache_ftype, strlen(typestr) + 1);
155 memcpy(smb->smsi_cache_ftype, typestr, strlen(typestr));
157 OBD_ALLOC(smb->smsi_ftype, strlen(SMFS_TYPE) + 1);
158 memcpy(smb->smsi_ftype, SMFS_TYPE, strlen(SMFS_TYPE));
160 err = smfs_init_fsfilt_ops(smb);
165 static int smfs_umount_cache(struct smfs_super_info *smb)
167 iput(smb->smsi_sb->s_root->d_inode);
168 dput(smb->smsi_sb->s_root);
169 mntput(smb->smsi_mnt);
170 smfs_cleanup_sm_ops(smb);
171 smfs_cleanup_fsfilt_ops(smb);
173 if (smb->smsi_cache_ftype)
174 OBD_FREE(smb->smsi_cache_ftype,
175 strlen(smb->smsi_cache_ftype) + 1);
177 OBD_FREE(smb->smsi_ftype, strlen(smb->smsi_ftype) + 1);
182 static int smfs_init_hook_ops(struct smfs_super_info *smb)
186 INIT_LIST_HEAD(&smb->smsi_hook_list);
190 static void smfs_cleanup_hook_ops(struct smfs_super_info *smb)
192 struct list_head *hlist = &smb->smsi_hook_list;
195 while (!list_empty(hlist)) {
196 struct smfs_hook_ops *smfs_hops;
198 smfs_hops = list_entry(hlist->next, struct smfs_hook_ops,
200 CERROR("Unregister %s hook ops\n", smfs_hops->smh_name);
202 smfs_unregister_hook_ops(smb, smfs_hops->smh_name);
203 smfs_free_hook_ops(smfs_hops);
209 static void smfs_cleanup_smb(struct super_block *sb)
211 struct smfs_super_info *smb;
216 OBD_FREE(smb, sizeof(*smb));
220 static void smfs_cleanup_hooks(struct smfs_super_info *smb)
223 if (SMFS_CACHE_HOOK(smb))
224 cache_space_hook_exit(smb);
225 if (SMFS_DO_REC(smb))
226 smfs_rec_cleanup(smb);
228 if (SMFS_DO_COW(smb))
229 smfs_cow_cleanup(smb);
233 void smfs_put_super(struct super_block *sb)
235 struct smfs_super_info *smfs_info = S2SMI(sb);
237 smfs_cleanup_hooks(smfs_info);
239 smfs_cleanup_hook_ops(smfs_info);
241 smfs_umount_cache(smfs_info);
242 smfs_cleanup_smb(sb);
246 static int smfs_init_hooks(struct super_block *sb)
250 if (SMFS_DO_REC(S2SMI(sb)))
252 if (SMFS_CACHE_HOOK(S2SMI(sb)))
253 cache_space_hook_init(sb);
255 if (SMFS_DO_COW(S2SMI(sb)))
261 int smfs_fill_super(struct super_block *sb, void *data, int silent)
263 struct inode *root_inode = NULL;
264 struct smfs_super_info *smb = NULL;
265 char *devstr = NULL, *typestr = NULL;
266 char *opts = NULL, *cache_data = NULL;
273 CDEBUG(D_SUPER, "mount opts: %s\n", data ? (char *)data : "(none)");
275 smb = smfs_init_smb(sb);
279 page = __get_free_page(GFP_KERNEL);
281 GOTO(out_err, err = -ENOMEM);
283 memset((void *)page, 0, PAGE_SIZE);
287 cache_data = smfs_options(data, &devstr, &typestr, opts,
290 CWARN("smfs_fill_super(): options parsing stoped at "
291 "option %s\n", cache_data);
293 if (!typestr || !devstr) {
294 CERROR("mount options name and dev mandatory\n");
296 GOTO(out_err, err = -EINVAL);
298 err = smfs_mount_cache(smb, devstr, typestr, opts);
303 CERROR("Can not mount %s as %s\n", devstr, typestr);
307 duplicate_sb(sb, smb->smsi_sb);
308 sm_set_sb_ops(smb->smsi_sb, sb);
310 err = smfs_init_hook_ops(smb);
312 CERROR("Can not init super hook ops err %d\n", err);
315 /*init the root_inode of smfs*/
316 dget(S2CSB(sb)->s_root);
317 root_ino = S2CSB(sb)->s_root->d_inode->i_ino;
318 root_inode = smfs_get_inode(sb, root_ino, NULL, 0);
320 CDEBUG(D_SUPER, "readinode %p, root ino %ld, root inode at %p\n",
321 sb->s_op->read_inode, root_ino, root_inode);
323 sb->s_root = d_alloc_root(root_inode);
326 smfs_umount_cache(smb);
327 GOTO(out_err, err=-EINVAL);
330 err = smfs_init_hooks(sb);
332 smfs_umount_cache(smb);
333 GOTO(out_err, err=-EINVAL);
335 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
336 CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
337 (ulong)sb, (ulong)&sb->u.generic_sbp);
339 CDEBUG(D_SUPER, "sb %lx, &sb->s_fs_info: %lx\n",
340 (ulong)sb, (ulong)&sb->s_fs_info);
345 smfs_cleanup_smb(sb);
348 struct smfs_hook_ops *smfs_alloc_hook_ops(char *name, smfs_hook_func pre_hook,
349 smfs_hook_func post_hook)
351 struct smfs_hook_ops *smfs_hops = NULL;
354 OBD_ALLOC(smfs_hops, sizeof(struct smfs_hook_ops));
359 OBD_ALLOC(smfs_hops->smh_name, strlen(name) + 1);
361 if (!smfs_hops->smh_name) {
362 OBD_FREE(smfs_hops, sizeof(struct smfs_hook_ops));
366 memcpy(smfs_hops->smh_name, name, strlen(name));
368 smfs_hops->smh_post_op = post_hook;
369 smfs_hops->smh_pre_op = pre_hook;
374 void smfs_free_hook_ops(struct smfs_hook_ops *hops)
378 OBD_FREE(hops->smh_name, strlen(hops->smh_name) + 1);
380 OBD_FREE(hops, sizeof(struct smfs_hook_ops));
384 int smfs_register_hook_ops(struct smfs_super_info *smb,
385 struct smfs_hook_ops *smh_ops)
387 struct list_head *hlist = &smb->smsi_hook_list;
391 list_for_each(p, hlist) {
392 struct smfs_hook_ops *found;
393 found = list_entry(p, struct smfs_hook_ops, smh_list);
394 if (!strcmp(found->smh_name, smh_ops->smh_name)) {
395 CWARN("hook ops %s list reregister\n", smh_ops->smh_name);
399 list_add(&smh_ops->smh_list, hlist);
402 struct smfs_hook_ops *smfs_unregister_hook_ops(struct smfs_super_info *smb,
405 struct list_head *hlist = &smb->smsi_hook_list;
409 list_for_each(p, hlist) {
410 struct smfs_hook_ops *found;
412 found = list_entry(p, typeof(*found), smh_list);
413 if (!memcmp(found->smh_name, name, strlen(name))) {