1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre filesystem abstraction routines
6 * Copyright (C) 2004 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_FILTER
27 #include <linux/jbd.h>
28 #include <linux/slab.h>
29 #include <linux/pagemap.h>
30 #include <linux/quotaops.h>
31 #include <linux/version.h>
32 #include <libcfs/kp30.h>
33 #include <linux/lustre_fsfilt.h>
34 #include <linux/lustre_smfs.h>
35 #include <linux/obd.h>
36 #include <linux/obd_class.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
40 #include <linux/lustre_snap.h>
41 #include <linux/lustre_smfs.h>
43 static struct inode* fsfilt_smfs_create_indirect(struct inode *inode,
49 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
50 struct inode *cache_inode = NULL;
51 struct inode *cache_parent = NULL;
52 struct inode *cache_ind_inode = NULL;
53 struct inode *ind_inode = NULL;
59 cache_inode = I2CI(inode);
63 cache_parent = I2CI(parent);
67 pre_smfs_inode(inode, cache_inode);
68 pre_smfs_inode(inode, cache_parent);
70 if (snap_fsfilt->fs_create_indirect)
71 cache_ind_inode = snap_fsfilt->fs_create_indirect(cache_inode,
72 index, gen, cache_parent, del);
73 post_smfs_inode(inode, cache_inode);
74 post_smfs_inode(inode, cache_parent);
76 if (cache_ind_inode && !IS_ERR(cache_ind_inode)){
77 /*FIXME: get indirect inode set_cow flags*/
78 ind_inode = smfs_get_inode(inode->i_sb, cache_ind_inode->i_ino,
85 static struct inode* fsfilt_smfs_get_indirect(struct inode *inode,
88 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
89 struct inode *cache_inode = NULL;
90 struct inode *cache_ind_inode = NULL;
91 struct inode *ind_inode = NULL;
97 cache_inode = I2CI(inode);
101 pre_smfs_inode(inode, cache_inode);
103 if (snap_fsfilt->fs_get_indirect)
104 cache_ind_inode = snap_fsfilt->fs_get_indirect(cache_inode,
106 post_smfs_inode(inode, cache_inode);
108 if (cache_ind_inode && !IS_ERR(cache_ind_inode)){
109 /*FIXME: get indirect inode set_cow flags*/
110 ind_inode = smfs_get_inode(inode->i_sb, cache_ind_inode->i_ino,
117 static int fsfilt_smfs_set_indirect(struct inode *inode, int index,
118 ino_t ind_ino, ino_t parent_ino)
120 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
121 struct inode *cache_inode = NULL;
125 if (snap_fsfilt == NULL)
128 cache_inode = I2CI(inode);
132 pre_smfs_inode(inode, cache_inode);
133 if (snap_fsfilt->fs_set_indirect)
134 rc = snap_fsfilt->fs_set_indirect(cache_inode, index,
135 ind_ino, parent_ino);
136 post_smfs_inode(inode, cache_inode);
141 static int fsfilt_smfs_snap_feature(struct super_block *sb, int feature,
144 struct fsfilt_operations *snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
145 struct super_block *csb = S2CSB(sb);
148 if (snap_fsfilt == NULL)
153 if (snap_fsfilt->fs_snap_feature)
154 rc = snap_fsfilt->fs_snap_feature(csb, feature, op);
159 static int fsfilt_smfs_is_redirector(struct inode *inode)
161 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
162 struct inode *cache_inode = NULL;
166 if (snap_fsfilt == NULL)
169 cache_inode = I2CI(inode);
173 pre_smfs_inode(inode, cache_inode);
174 if (snap_fsfilt->fs_is_redirector)
175 rc = snap_fsfilt->fs_is_redirector(cache_inode);
176 post_smfs_inode(inode, cache_inode);
180 static int fsfilt_smfs_is_indirect(struct inode *inode)
182 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
183 struct inode *cache_inode = NULL;
187 if (snap_fsfilt == NULL)
190 cache_inode = I2CI(inode);
194 pre_smfs_inode(inode, cache_inode);
195 if (snap_fsfilt->fs_is_indirect)
196 rc = snap_fsfilt->fs_is_indirect(cache_inode);
197 post_smfs_inode(inode, cache_inode);
201 static ino_t fsfilt_smfs_get_indirect_ino(struct super_block *sb, ino_t ino,
204 struct fsfilt_operations *snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
205 struct super_block *csb = S2CSB(sb);
209 if (snap_fsfilt == NULL)
212 if (snap_fsfilt->fs_get_indirect_ino)
213 rc = snap_fsfilt->fs_get_indirect_ino(csb, ino, index);
218 static int fsfilt_smfs_destroy_indirect(struct inode *inode, int index,
219 struct inode *next_ind)
221 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
222 struct inode *cache_inode = NULL;
223 struct inode *cache_next = NULL;
227 if (snap_fsfilt == NULL)
230 cache_inode = I2CI(inode);
234 cache_next = I2CI(next_ind);
238 pre_smfs_inode(inode, cache_inode);
239 pre_smfs_inode(next_ind, cache_next);
241 if (snap_fsfilt->fs_destroy_indirect)
242 rc = snap_fsfilt->fs_destroy_indirect(cache_inode, index,
244 post_smfs_inode(inode, cache_inode);
245 post_smfs_inode(next_ind, cache_next);
249 static int fsfilt_smfs_restore_indirect(struct inode *inode, int index)
251 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
252 struct inode *cache_inode = NULL;
256 if (snap_fsfilt == NULL)
259 cache_inode = I2CI(inode);
263 pre_smfs_inode(inode, cache_inode);
265 if (snap_fsfilt->fs_restore_indirect)
266 rc = snap_fsfilt->fs_restore_indirect(cache_inode, index);
268 post_smfs_inode(inode, cache_inode);
272 static int fsfilt_smfs_iterate(struct super_block *sb,
273 int (*repeat)(struct inode *inode, void *priv),
274 struct inode **start, void *priv, int flag)
276 struct fsfilt_operations *snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
277 struct super_block *csb = S2CSB(sb);
281 /*FIXME start == NULL, later*/
282 LASSERT(start == NULL);
284 if (snap_fsfilt == NULL)
287 if (snap_fsfilt->fs_iterate)
288 rc = snap_fsfilt->fs_iterate(csb, repeat, start, priv, flag);
293 static int fsfilt_smfs_copy_block(struct inode *dst, struct inode *src, int blk)
295 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(dst);
296 struct inode *cache_dst = NULL;
297 struct inode *cache_src = NULL;
301 if (snap_fsfilt == NULL)
304 cache_dst = I2CI(dst);
308 cache_src = I2CI(src);
312 pre_smfs_inode(dst, cache_dst);
313 pre_smfs_inode(src, cache_src);
315 if (snap_fsfilt->fs_copy_block)
316 rc = snap_fsfilt->fs_copy_block(cache_dst, cache_src, blk);
318 post_smfs_inode(dst, cache_dst);
319 post_smfs_inode(src, cache_src);
324 static int fsfilt_smfs_set_snap_info(struct inode *inode,
325 void* key, __u32 keylen, void *val,
329 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
330 struct inode *cache_inode = NULL;
333 if (snap_fsfilt == NULL)
336 cache_inode = I2CI(inode);
340 pre_smfs_inode(inode, cache_inode);
342 if (snap_fsfilt->fs_set_snap_info)
343 rc = snap_fsfilt->fs_set_snap_info(cache_inode, key,
344 keylen, val, vallen);
345 post_smfs_inode(inode, cache_inode);
350 static int fsfilt_smfs_get_snap_info(struct inode *inode, void *key,
351 __u32 keylen, void *val, __u32 *vallen)
353 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
354 struct inode *cache_inode = NULL;
357 if (snap_fsfilt == NULL)
360 cache_inode = I2CI(inode);
364 if (snap_fsfilt->fs_get_snap_info)
365 rc = snap_fsfilt->fs_get_snap_info(cache_inode, key,
366 keylen, val, vallen);
371 static int fsfilt_smfs_read_dotsnap_dir_page(struct file *file, char *buf,
372 size_t count, loff_t *off)
375 struct inode *inode = file->f_dentry->d_inode;
376 struct fsfilt_operations *snap_cops = I2SNAPCOPS(inode);
377 int i = 0, size = 0, off_count = 0, buf_off = 0, rc = 0;
379 /*Get the offset of dir ent*/
380 //struct snap_table *stbl = S2SNAPI(inode->i_sb)->sni_table;
381 while (size < *off && off_count < stbl->sntbl_count) {
382 char *name = stbl->sntbl_items[i].sn_name;
383 size +=snap_cops->fs_dir_ent_size(name);
386 for (i = off_count; i < stbl->sntbl_count; i++) {
387 char *name = stbl->sntbl_items[i].sn_name;
388 rc = snap_cops->fs_set_dir_ent(inode->i_sb, name, buf, buf_off,
395 if (buf_off >= count)
401 #warning "still not implement read .snap dir page for fsfilt Wangdi"
406 struct fsfilt_operations fsfilt_smfs_snap_ops = {
407 .fs_type = "smfs_snap",
408 .fs_owner = THIS_MODULE,
409 .fs_create_indirect = fsfilt_smfs_create_indirect,
410 .fs_get_indirect = fsfilt_smfs_get_indirect,
411 .fs_set_indirect = fsfilt_smfs_set_indirect,
412 .fs_snap_feature = fsfilt_smfs_snap_feature,
413 .fs_is_redirector = fsfilt_smfs_is_redirector,
414 .fs_is_indirect = fsfilt_smfs_is_indirect,
415 .fs_get_indirect_ino = fsfilt_smfs_get_indirect_ino,
416 .fs_destroy_indirect = fsfilt_smfs_destroy_indirect,
417 .fs_restore_indirect = fsfilt_smfs_restore_indirect,
418 .fs_iterate = fsfilt_smfs_iterate,
419 .fs_copy_block = fsfilt_smfs_copy_block,
420 .fs_set_snap_info = fsfilt_smfs_set_snap_info,
421 .fs_get_snap_info = fsfilt_smfs_get_snap_info,
422 .fs_read_dotsnap_dir_page = fsfilt_smfs_read_dotsnap_dir_page,
426 static int __init fsfilt_smfs_snap_init(void)
430 rc = fsfilt_register_ops(&fsfilt_smfs_snap_ops);
434 static void __exit fsfilt_smfs_snap_exit(void)
436 fsfilt_unregister_ops(&fsfilt_smfs_snap_ops);
439 module_init(fsfilt_smfs_snap_init);
440 module_exit(fsfilt_smfs_snap_exit);
442 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
443 MODULE_DESCRIPTION("Lustre SMFS SNAP Filesystem Helper v0.1");
444 MODULE_LICENSE("GPL");