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;
54 LASSERT(opts && flags);
56 while (!(get_opt(&opt_value, &pos))) {
57 if (!strcmp(opt_value->opt, "dev")) {
59 *devstr = opt_value->value;
60 } else if (!strcmp(opt_value->opt, "type")) {
62 *namestr = opt_value->value;
63 } else if (!strcmp(opt_value->opt, "kml")) {
65 } else if (!strcmp(opt_value->opt, "cache")) {
66 *flags |= SM_CACHE_HOOK;
67 } else if (!strcmp(opt_value->opt, "snap")) {
69 } else if (!strcmp(opt_value->opt, "options")) {
70 if (strlen(opts) == 0)
71 sprintf((char *)opts + strlen(opts), "%s",
74 sprintf((char *)opts + strlen(opts), ",%s",
77 /*FIXME:WANGDI How about the opt_value->value*/
78 if (strlen(opts) == 0)
79 sprintf((char *)opts + strlen(opts), "%s",
82 sprintf((char *)opts + strlen(opts), ",%s",
88 static struct smfs_super_info *smfs_init_smb(struct super_block *sb)
90 struct smfs_super_info *smb;
93 OBD_ALLOC(smb, sizeof(*smb));
100 static int smfs_init_fsfilt_ops(struct smfs_super_info *smb)
103 if (!smb->sm_cache_fsfilt) {
104 smb->sm_cache_fsfilt = fsfilt_get_ops(smb->smsi_cache_ftype);
105 if (!smb->sm_cache_fsfilt) {
106 CERROR("Can not get %s fsfilt ops needed by kml\n",
107 smb->smsi_cache_ftype);
111 if (!smb->sm_fsfilt) {
112 smb->sm_fsfilt = fsfilt_get_ops(smb->smsi_ftype);
113 if (!smb->sm_fsfilt) {
114 CERROR("Can not get %s fsfilt ops needed by kml\n",
122 void smfs_cleanup_fsfilt_ops(struct smfs_super_info *smb)
124 if (smb->sm_cache_fsfilt)
125 fsfilt_put_ops(smb->sm_cache_fsfilt);
127 fsfilt_put_ops(smb->sm_fsfilt);
130 static int smfs_mount_cache(struct smfs_super_info *smb, char *devstr,
131 char *typestr, char *opts)
133 int err = 0, typelen;
134 struct vfsmount *mnt;
137 typelen = strlen(typestr);
139 printk("smfs: mounting %s at %s\n", typestr, devstr);
141 mnt = do_kern_mount(typestr, 0, devstr, (void *)opts);
144 CERROR("do_kern_mount failed: rc = %ld\n", PTR_ERR(mnt));
145 GOTO(err_out, err = PTR_ERR(mnt));
148 smb->smsi_sb = mnt->mnt_sb;
151 smfs_init_sm_ops(smb);
153 OBD_ALLOC(smb->smsi_cache_ftype, strlen(typestr) + 1);
154 memcpy(smb->smsi_cache_ftype, typestr, strlen(typestr));
156 OBD_ALLOC(smb->smsi_ftype, strlen(SMFS_TYPE) + 1);
157 memcpy(smb->smsi_ftype, SMFS_TYPE, strlen(SMFS_TYPE));
159 err = smfs_init_fsfilt_ops(smb);
164 static int smfs_umount_cache(struct smfs_super_info *smb)
166 iput(smb->smsi_sb->s_root->d_inode);
167 dput(smb->smsi_sb->s_root);
168 mntput(smb->smsi_mnt);
169 smfs_cleanup_sm_ops(smb);
170 smfs_cleanup_fsfilt_ops(smb);
172 if (smb->smsi_cache_ftype)
173 OBD_FREE(smb->smsi_cache_ftype,
174 strlen(smb->smsi_cache_ftype) + 1);
176 OBD_FREE(smb->smsi_ftype, strlen(smb->smsi_ftype) + 1);
181 static int smfs_init_hook_ops(struct smfs_super_info *smb)
185 INIT_LIST_HEAD(&smb->smsi_hook_list);
189 static void smfs_cleanup_hook_ops(struct smfs_super_info *smb)
191 struct list_head *hlist = &smb->smsi_hook_list;
194 while (!list_empty(hlist)) {
195 struct smfs_hook_ops *smfs_hops;
197 smfs_hops = list_entry(hlist->next, struct smfs_hook_ops,
199 CERROR("Unregister %s hook ops\n", smfs_hops->smh_name);
201 smfs_unregister_hook_ops(smb, smfs_hops->smh_name);
202 smfs_free_hook_ops(smfs_hops);
208 static void smfs_cleanup_smb(struct super_block *sb)
210 struct smfs_super_info *smb;
215 OBD_FREE(smb, sizeof(*smb));
219 static void smfs_cleanup_hooks(struct smfs_super_info *smb)
222 if (SMFS_CACHE_HOOK(smb))
223 cache_space_hook_exit(smb);
224 if (SMFS_DO_REC(smb))
225 smfs_rec_cleanup(smb);
227 if (SMFS_DO_COW(smb))
228 smfs_cow_cleanup(smb);
232 void smfs_put_super(struct super_block *sb)
234 struct smfs_super_info *smfs_info = S2SMI(sb);
236 smfs_cleanup_hooks(smfs_info);
238 smfs_cleanup_hook_ops(smfs_info);
240 smfs_umount_cache(smfs_info);
241 smfs_cleanup_smb(sb);
245 static int smfs_init_hooks(struct super_block *sb)
249 if (SMFS_DO_REC(S2SMI(sb)))
251 if (SMFS_CACHE_HOOK(S2SMI(sb)))
252 cache_space_hook_init(sb);
254 if (SMFS_DO_COW(S2SMI(sb)))
260 int smfs_fill_super(struct super_block *sb, void *data, int silent)
262 struct inode *root_inode = NULL;
263 struct smfs_super_info *smb = NULL;
264 char *devstr = NULL, *typestr = NULL;
265 char *opts = NULL, *cache_data = NULL;
272 CDEBUG(D_SUPER, "mount opts: %s\n", data ? (char *)data : "(none)");
274 smb = smfs_init_smb(sb);
278 page = __get_free_page(GFP_KERNEL);
280 GOTO(out_err, err = -ENOMEM);
282 memset((void *)page, 0, PAGE_SIZE);
286 cache_data = smfs_options(data, &devstr, &typestr, opts,
289 CWARN("smfs_fill_super(): options parsing stoped at "
290 "option %s\n", cache_data);
292 if (!typestr || !devstr) {
293 CERROR("mount options name and dev mandatory\n");
295 GOTO(out_err, err = -EINVAL);
297 err = smfs_mount_cache(smb, devstr, typestr, opts);
302 CERROR("Can not mount %s as %s\n", devstr, typestr);
306 duplicate_sb(sb, smb->smsi_sb);
307 sm_set_sb_ops(smb->smsi_sb, sb);
309 err = smfs_init_hook_ops(smb);
311 CERROR("Can not init super hook ops err %d\n", err);
314 /*init the root_inode of smfs*/
315 dget(S2CSB(sb)->s_root);
316 root_ino = S2CSB(sb)->s_root->d_inode->i_ino;
317 root_inode = smfs_get_inode(sb, root_ino, NULL, 0);
319 CDEBUG(D_SUPER, "readinode %p, root ino %ld, root inode at %p\n",
320 sb->s_op->read_inode, root_ino, root_inode);
322 sb->s_root = d_alloc_root(root_inode);
325 smfs_umount_cache(smb);
326 GOTO(out_err, err=-EINVAL);
329 err = smfs_init_hooks(sb);
331 smfs_umount_cache(smb);
332 GOTO(out_err, err=-EINVAL);
334 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
335 CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
336 (ulong)sb, (ulong)&sb->u.generic_sbp);
338 CDEBUG(D_SUPER, "sb %lx, &sb->s_fs_info: %lx\n",
339 (ulong)sb, (ulong)&sb->s_fs_info);
344 smfs_cleanup_smb(sb);
347 struct smfs_hook_ops *smfs_alloc_hook_ops(char *name, smfs_hook_func pre_hook,
348 smfs_hook_func post_hook)
350 struct smfs_hook_ops *smfs_hops = NULL;
353 OBD_ALLOC(smfs_hops, sizeof(struct smfs_hook_ops));
358 OBD_ALLOC(smfs_hops->smh_name, strlen(name) + 1);
360 if (!smfs_hops->smh_name) {
361 OBD_FREE(smfs_hops, sizeof(struct smfs_hook_ops));
365 memcpy(smfs_hops->smh_name, name, strlen(name));
367 smfs_hops->smh_post_op = post_hook;
368 smfs_hops->smh_pre_op = pre_hook;
373 void smfs_free_hook_ops(struct smfs_hook_ops *hops)
377 OBD_FREE(hops->smh_name, strlen(hops->smh_name) + 1);
379 OBD_FREE(hops, sizeof(struct smfs_hook_ops));
383 int smfs_register_hook_ops(struct smfs_super_info *smb,
384 struct smfs_hook_ops *smh_ops)
386 struct list_head *hlist = &smb->smsi_hook_list;
390 list_for_each(p, hlist) {
391 struct smfs_hook_ops *found;
392 found = list_entry(p, struct smfs_hook_ops, smh_list);
393 if (!strcmp(found->smh_name, smh_ops->smh_name)) {
394 CWARN("hook ops %s list reregister\n", smh_ops->smh_name);
398 list_add(&smh_ops->smh_list, hlist);
401 struct smfs_hook_ops *smfs_unregister_hook_ops(struct smfs_super_info *smb,
404 struct list_head *hlist = &smb->smsi_hook_list;
408 list_for_each(p, hlist) {
409 struct smfs_hook_ops *found;
411 found = list_entry(p, typeof(*found), smh_list);
412 if (!memcmp(found->smh_name, name, strlen(name))) {
420 void *smfs_trans_start(struct inode *inode, int op, void *desc_private)
422 struct fsfilt_operations *fsfilt = S2SMI(inode->i_sb)->sm_fsfilt;
424 CDEBUG(D_INFO, "trans start %p\n", fsfilt->fs_start);
426 SMFS_TRANS_OP(inode, op);
428 /* There are some problem here. fs_start in fsfilt is used by lustre
429 * the journal blocks of write rec are not counted in FIXME later */
430 if (fsfilt->fs_start)
431 return fsfilt->fs_start(inode, op, desc_private, 0);
435 void smfs_trans_commit(struct inode *inode, void *handle, int force_sync)
437 struct fsfilt_operations *fsfilt = S2SMI(inode->i_sb)->sm_fsfilt;
442 CDEBUG(D_INFO, "trans commit %p\n", fsfilt->fs_commit);
444 if (fsfilt->fs_commit)
445 fsfilt->fs_commit(inode->i_sb, inode, handle, force_sync);