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 <linux/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 = iget4(inode->i_sb, cache_ind_inode->i_ino, NULL, 0);
83 static struct inode* fsfilt_smfs_get_indirect(struct inode *inode,
86 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
87 struct inode *cache_inode = NULL;
88 struct inode *cache_ind_inode = NULL;
89 struct inode *ind_inode = NULL;
95 cache_inode = I2CI(inode);
99 pre_smfs_inode(inode, cache_inode);
101 if (snap_fsfilt->fs_get_indirect)
102 cache_ind_inode = snap_fsfilt->fs_get_indirect(cache_inode,
104 post_smfs_inode(inode, cache_inode);
106 if (cache_ind_inode && !IS_ERR(cache_ind_inode)){
107 /*FIXME: get indirect inode set_cow flags*/
108 ind_inode = iget4(inode->i_sb, cache_ind_inode->i_ino, NULL, 0);
113 static int fsfilt_smfs_set_indirect(struct inode *inode, int index,
114 ino_t ind_ino, ino_t parent_ino)
116 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
117 struct inode *cache_inode = NULL;
121 if (snap_fsfilt == NULL)
124 cache_inode = I2CI(inode);
128 pre_smfs_inode(inode, cache_inode);
129 if (snap_fsfilt->fs_set_indirect)
130 rc = snap_fsfilt->fs_set_indirect(cache_inode, index,
131 ind_ino, parent_ino);
132 post_smfs_inode(inode, cache_inode);
137 static int fsfilt_smfs_snap_feature(struct super_block *sb, int feature,
140 struct fsfilt_operations *snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
141 struct super_block *csb = S2CSB(sb);
144 if (snap_fsfilt == NULL)
149 if (snap_fsfilt->fs_snap_feature)
150 rc = snap_fsfilt->fs_snap_feature(csb, feature, op);
155 static int fsfilt_smfs_is_redirector(struct inode *inode)
157 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
158 struct inode *cache_inode = NULL;
162 if (snap_fsfilt == NULL)
165 cache_inode = I2CI(inode);
169 pre_smfs_inode(inode, cache_inode);
170 if (snap_fsfilt->fs_is_redirector)
171 rc = snap_fsfilt->fs_is_redirector(cache_inode);
172 post_smfs_inode(inode, cache_inode);
176 static int fsfilt_smfs_is_indirect(struct inode *inode)
178 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
179 struct inode *cache_inode = NULL;
183 if (snap_fsfilt == NULL)
186 cache_inode = I2CI(inode);
190 pre_smfs_inode(inode, cache_inode);
191 if (snap_fsfilt->fs_is_indirect)
192 rc = snap_fsfilt->fs_is_indirect(cache_inode);
193 post_smfs_inode(inode, cache_inode);
197 static ino_t fsfilt_smfs_get_indirect_ino(struct inode *inode, int index)
199 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
200 struct inode *cache_inode = NULL;
204 if (snap_fsfilt == NULL)
207 cache_inode = I2CI(inode);
211 pre_smfs_inode(inode, cache_inode);
212 if (snap_fsfilt->fs_get_indirect_ino)
213 rc = snap_fsfilt->fs_get_indirect_ino(cache_inode, index);
214 post_smfs_inode(inode, cache_inode);
219 static int fsfilt_smfs_destroy_indirect(struct inode *inode, int index,
220 struct inode *next_ind)
222 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
223 struct inode *cache_inode = NULL;
224 struct inode *cache_next = NULL;
228 if (snap_fsfilt == NULL)
231 cache_inode = I2CI(inode);
235 cache_next = I2CI(next_ind);
239 pre_smfs_inode(inode, cache_inode);
240 pre_smfs_inode(next_ind, cache_next);
242 if (snap_fsfilt->fs_destroy_indirect)
243 rc = snap_fsfilt->fs_destroy_indirect(cache_inode, index,
245 post_smfs_inode(inode, cache_inode);
246 post_smfs_inode(next_ind, cache_next);
250 static int fsfilt_smfs_restore_indirect(struct inode *inode, int index)
252 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(inode);
253 struct inode *cache_inode = NULL;
257 if (snap_fsfilt == NULL)
260 cache_inode = I2CI(inode);
264 pre_smfs_inode(inode, cache_inode);
266 if (snap_fsfilt->fs_restore_indirect)
267 rc = snap_fsfilt->fs_restore_indirect(cache_inode, index);
269 post_smfs_inode(inode, cache_inode);
273 static int fsfilt_smfs_iterate(struct super_block *sb,
274 int (*repeat)(struct inode *inode, void *priv),
275 struct inode **start, void *priv, int flag)
277 struct fsfilt_operations *snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
278 struct super_block *csb = S2CSB(sb);
282 /*FIXME start == NULL, later*/
283 LASSERT(start == NULL);
285 if (snap_fsfilt == NULL)
288 if (snap_fsfilt->fs_iterate)
289 rc = snap_fsfilt->fs_iterate(csb, repeat, start, priv, flag);
294 static int fsfilt_smfs_copy_block(struct inode *dst, struct inode *src, int blk)
296 struct fsfilt_operations *snap_fsfilt = I2SNAPCOPS(dst);
297 struct inode *cache_dst = NULL;
298 struct inode *cache_src = NULL;
302 if (snap_fsfilt == NULL)
305 cache_dst = I2CI(dst);
309 cache_src = I2CI(src);
313 pre_smfs_inode(dst, cache_dst);
314 pre_smfs_inode(src, cache_src);
316 if (snap_fsfilt->fs_copy_block)
317 rc = snap_fsfilt->fs_copy_block(cache_dst, cache_src, blk);
319 post_smfs_inode(dst, cache_dst);
320 post_smfs_inode(src, cache_src);
325 static int fsfilt_smfs_set_snap_info(struct super_block *sb,struct inode *inode,
326 void* key, __u32 keylen, void *val,
329 struct super_block *csb = NULL;
330 struct inode *cache_inode = NULL;
331 struct fsfilt_operations *snap_fsfilt = NULL;
336 snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
338 cache_inode = I2CI(inode);
339 snap_fsfilt = I2SNAPCOPS(inode);
342 if (snap_fsfilt == NULL)
345 if (snap_fsfilt->fs_set_snap_info)
346 rc = snap_fsfilt->fs_set_snap_info(csb, cache_inode, key,
347 keylen, val, vallen);
352 static int fsfilt_smfs_get_snap_info(struct super_block *sb, struct inode *inode,
353 void *key, __u32 keylen, void *val,
356 struct super_block *csb = NULL;
357 struct inode *cache_inode = NULL;
358 struct fsfilt_operations *snap_fsfilt = NULL;
363 snap_fsfilt = S2SNAPI(sb)->snap_cache_fsfilt;
365 cache_inode = I2CI(inode);
366 snap_fsfilt = I2SNAPCOPS(inode);
369 if (snap_fsfilt == NULL)
372 if (snap_fsfilt->fs_get_snap_info)
373 rc = snap_fsfilt->fs_get_snap_info(csb, cache_inode, key,
374 keylen, val, vallen);
378 struct fsfilt_operations fsfilt_smfs_snap_ops = {
379 .fs_type = "smfs_snap",
380 .fs_owner = THIS_MODULE,
381 .fs_create_indirect = fsfilt_smfs_create_indirect,
382 .fs_get_indirect = fsfilt_smfs_get_indirect,
383 .fs_set_indirect = fsfilt_smfs_set_indirect,
384 .fs_snap_feature = fsfilt_smfs_snap_feature,
385 .fs_is_redirector = fsfilt_smfs_is_redirector,
386 .fs_is_indirect = fsfilt_smfs_is_indirect,
387 .fs_get_indirect_ino = fsfilt_smfs_get_indirect_ino,
388 .fs_destroy_indirect = fsfilt_smfs_destroy_indirect,
389 .fs_restore_indirect = fsfilt_smfs_restore_indirect,
390 .fs_iterate = fsfilt_smfs_iterate,
391 .fs_copy_block = fsfilt_smfs_copy_block,
392 .fs_set_snap_info = fsfilt_smfs_set_snap_info,
393 .fs_get_snap_info = fsfilt_smfs_get_snap_info,
397 static int __init fsfilt_smfs_snap_init(void)
401 rc = fsfilt_register_ops(&fsfilt_smfs_snap_ops);
405 static void __exit fsfilt_smfs_snap_exit(void)
407 fsfilt_unregister_ops(&fsfilt_smfs_snap_ops);
410 module_init(fsfilt_smfs_snap_init);
411 module_exit(fsfilt_smfs_snap_exit);
413 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
414 MODULE_DESCRIPTION("Lustre SMFS SNAP Filesystem Helper v0.1");
415 MODULE_LICENSE("GPL");