4 #define DEBUG_SUBSYSTEM S_SNAP
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/string.h>
9 #include <linux/slab.h>
10 #include <linux/stat.h>
11 #include <linux/unistd.h>
13 #include "smfs_internal.h"
15 #define NAME_ALLOC_LEN(len) ((len+16) & ~15)
18 struct dentry cache_dentry;
20 void smfs_clear_dentry(struct dentry *dentry)
22 struct qstr *name = NULL;
25 if (!atomic_dec_and_lock(&dentry->d_count, &dcache_lock))
27 list_del(&dentry->d_hash);
28 INIT_LIST_HEAD(&dentry->d_hash);
29 list_del(&dentry->d_child);
30 if (dentry->d_inode) {
31 dentry->d_inode = NULL;
32 list_del_init(&dentry->d_alias);
35 name = &(dentry->d_name);
36 if (name->len > DNAME_INLINE_LEN-1) {
37 SM_FREE((char *)name->name, NAME_ALLOC_LEN(name->len));
42 int smfs_prepare_dentry(struct dentry *dentry,
43 struct dentry *parent,
48 if (name->len > DNAME_INLINE_LEN-1) {
49 SM_ALLOC(str, NAME_ALLOC_LEN(name->len));
53 str = dentry->d_iname;
55 memcpy(str, name->name, name->len);
58 atomic_set(&dentry->d_count, 1);
59 dentry->d_vfs_flags = 0;
61 dentry->d_inode = NULL;
62 dentry->d_parent = NULL;
64 dentry->d_name.name = str;
65 dentry->d_name.len = name->len;
66 dentry->d_name.hash = name->hash;
68 dentry->d_fsdata = NULL;
69 dentry->d_mounted = 0;
70 INIT_LIST_HEAD(&dentry->d_hash);
71 INIT_LIST_HEAD(&dentry->d_lru);
72 INIT_LIST_HEAD(&dentry->d_subdirs);
73 INIT_LIST_HEAD(&dentry->d_alias);
76 dentry->d_parent = dget(parent);
77 dentry->d_sb = parent->d_sb;
78 list_add(&dentry->d_child, &parent->d_subdirs);
80 INIT_LIST_HEAD(&dentry->d_child);
84 static void prepare_parent_dentry(struct dentry *dentry, struct inode *inode)
86 atomic_set(&dentry->d_count, 1);
87 dentry->d_vfs_flags = 0;
89 dentry->d_inode = inode;
91 dentry->d_fsdata = NULL;
92 dentry->d_mounted = 0;
93 INIT_LIST_HEAD(&dentry->d_hash);
94 INIT_LIST_HEAD(&dentry->d_lru);
95 INIT_LIST_HEAD(&dentry->d_subdirs);
96 INIT_LIST_HEAD(&dentry->d_alias);
99 static int smfs_create(struct inode *dir,
100 struct dentry *dentry,
103 struct inode *cache_dir;
104 struct inode *cache_inode = NULL, *inode;
109 cache_dir = I2CI(dir);
113 prepare_parent_dentry(&parent, cache_dir);
114 smfs_prepare_dentry(&cache_dentry, &parent, &dentry->d_name);
116 if (cache_dir && cache_dir->i_op->create)
117 rc = cache_dir->i_op->create(cache_dir, &cache_dentry, mode);
121 cache_inode = cache_dentry.d_inode;
123 inode = iget(dir->i_sb, cache_inode->i_ino);
126 GOTO(exit, rc = -ENOMEM);
128 d_instantiate(dentry, inode);
130 sm_set_inode_ops(cache_inode, inode);
132 smfs_clear_dentry(&cache_dentry);
136 static struct dentry *smfs_lookup(struct inode *dir,
137 struct dentry *dentry)
139 struct inode *cache_dir;
140 struct inode *cache_inode = NULL, *inode;
142 struct dentry cache_dentry;
143 struct dentry *rc = NULL;
147 cache_dir = I2CI(dir);
149 RETURN(ERR_PTR(-ENOENT));
150 prepare_parent_dentry(&tmp, cache_dir);
151 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
153 if(cache_dir && cache_dir->i_op->lookup)
154 rc = cache_dir->i_op->lookup(cache_dir, &cache_dentry);
156 if (rc || !cache_dentry.d_inode ||
157 is_bad_inode(cache_dentry.d_inode) ||
158 IS_ERR(cache_dentry.d_inode)) {
162 cache_inode = cache_dentry.d_inode;
164 inode = iget(dir->i_sb, cache_inode->i_ino);
166 d_add(dentry, inode);
168 smfs_clear_dentry(&cache_dentry);
172 static int smfs_lookup_raw(struct inode *dir, const char *name,
173 int len, ino_t *data)
175 struct inode *cache_dir;
178 cache_dir = I2CI(dir);
183 if (cache_dir->i_op->lookup_raw)
184 rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
189 static int smfs_link(struct dentry * old_dentry,
190 struct inode * dir, struct dentry *dentry)
192 struct inode *cache_old_inode = NULL;
193 struct inode *cache_dir = I2CI(dir);
194 struct inode *inode = NULL;
195 struct dentry cache_dentry;
196 struct dentry cache_old_dentry;
198 struct dentry tmp_old;
201 inode = old_dentry->d_inode;
203 cache_old_inode = I2CI(inode);
205 if (!cache_old_inode || !cache_dir)
208 prepare_parent_dentry(&tmp, cache_dir);
209 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
211 prepare_parent_dentry(&tmp_old, cache_dir);
212 smfs_prepare_dentry(&cache_old_dentry, &tmp_old, &dentry->d_name);
213 d_add(&cache_old_dentry, cache_old_inode);
215 if (cache_dir->i_op->link)
216 rc = cache_dir->i_op->link(&cache_old_dentry, cache_dir, &cache_dentry);
219 d_instantiate(dentry, inode);
222 smfs_clear_dentry(&cache_dentry);
223 smfs_clear_dentry(&cache_old_dentry);
227 static int smfs_unlink(struct inode * dir,
228 struct dentry *dentry)
230 struct inode *cache_dir = I2CI(dir);
231 struct inode *cache_inode = I2CI(dentry->d_inode);
232 struct dentry cache_dentry;
236 if (!cache_dir || !cache_inode)
239 prepare_parent_dentry(&tmp, cache_dir);
240 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
241 d_add(&cache_dentry, cache_inode);
243 if (cache_dir->i_op->unlink)
244 rc = cache_dir->i_op->unlink(cache_dir, &cache_dentry);
246 duplicate_inode(cache_dentry.d_inode, dentry->d_inode);
247 duplicate_inode(cache_dir, dir);
249 smfs_clear_dentry(&cache_dentry);
253 static int smfs_symlink (struct inode * dir,
254 struct dentry *dentry,
255 const char * symname)
257 struct inode *cache_dir = I2CI(dir);
258 struct inode *cache_inode = NULL;
259 struct inode *inode = NULL;
260 struct dentry cache_dentry;
267 prepare_parent_dentry(&tmp, cache_dir);
268 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
270 if (cache_dir->i_op->symlink)
271 rc = cache_dir->i_op->symlink(cache_dir, &cache_dentry, symname);
273 cache_inode = cache_dentry.d_inode;
275 inode = iget(dir->i_sb, cache_inode->i_ino);
278 d_instantiate(dentry, inode);
282 smfs_clear_dentry(&cache_dentry);
286 static int smfs_mkdir(struct inode * dir,
287 struct dentry * dentry,
290 struct inode *cache_dir = I2CI(dir);
291 struct inode *cache_inode = NULL;
292 struct inode *inode = NULL;
293 struct dentry cache_dentry;
300 prepare_parent_dentry(&tmp, cache_dir);
301 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
303 if (cache_dir->i_op->mkdir)
304 rc = cache_dir->i_op->mkdir(cache_dir, &cache_dentry, mode);
306 cache_inode = cache_dentry.d_inode;
308 inode = iget(dir->i_sb, cache_inode->i_ino);
311 GOTO(exit, rc = -ENOENT);
313 d_instantiate(dentry, inode);
314 duplicate_inode(cache_dir, dir);
316 smfs_clear_dentry(&cache_dentry);
320 static int smfs_rmdir(struct inode * dir,
321 struct dentry *dentry)
323 struct inode *cache_dir = I2CI(dir);
324 struct inode *cache_inode = I2CI(dentry->d_inode);
325 struct dentry cache_dentry;
332 prepare_parent_dentry(&tmp, cache_dir);
333 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
334 d_add(&cache_dentry, cache_inode);
336 if (cache_dir->i_op->rmdir)
337 rc = cache_dir->i_op->rmdir(cache_dir, &cache_dentry);
339 duplicate_inode(cache_dir, dir);
340 duplicate_inode(cache_dentry.d_inode, dentry->d_inode);
342 smfs_clear_dentry(&cache_dentry);
346 static int smfs_mknod(struct inode * dir, struct dentry *dentry,
349 struct inode *cache_dir = I2CI(dir);
350 struct inode *inode = NULL;
351 struct inode *cache_inode = NULL;
352 struct dentry cache_dentry;
359 prepare_parent_dentry(&tmp, cache_dir);
360 smfs_prepare_dentry(&cache_dentry, &tmp, &dentry->d_name);
362 if (cache_dir->i_op->mknod)
363 rc = cache_dir->i_op->mknod(cache_dir, &cache_dentry, mode, rdev);
366 cache_inode = cache_dentry.d_inode;
367 inode = iget(dir->i_sb, cache_inode->i_ino);
368 d_instantiate(dentry, inode);
369 duplicate_inode(cache_dir, dir);
370 duplicate_inode(cache_dentry.d_inode, dentry->d_inode);
372 smfs_clear_dentry(&cache_dentry);
375 static int smfs_rename(struct inode * old_dir, struct dentry *old_dentry,
376 struct inode * new_dir,struct dentry *new_dentry)
378 struct inode *cache_old_dir = I2CI(old_dir);
379 struct inode *cache_new_dir = I2CI(new_dir);
380 struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
381 struct inode *cache_new_inode = NULL;
382 struct inode *new_inode = NULL;
383 struct dentry cache_old_dentry;
384 struct dentry cache_new_dentry;
385 struct dentry tmp_new;
386 struct dentry tmp_old;
389 if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
392 prepare_parent_dentry(&tmp_old, cache_old_dir);
393 smfs_prepare_dentry(&cache_old_dentry, &tmp_old, &old_dentry->d_name);
394 d_add(&cache_old_dentry, cache_old_inode);
396 prepare_parent_dentry(&tmp_new, cache_new_dir);
397 smfs_prepare_dentry(&cache_new_dentry, &tmp_new, &new_dentry->d_name);
399 if (cache_old_dir->i_op->rename)
400 rc = cache_old_dir->i_op->rename(cache_old_dir, &cache_old_dentry,
401 cache_new_dir, &cache_new_dentry);
404 cache_new_inode = cache_new_dentry.d_inode;
405 new_inode = iget(new_dir->i_sb, cache_new_inode->i_ino);
407 d_instantiate(new_dentry, new_inode);
410 duplicate_inode(cache_old_dir, old_dir);
411 duplicate_inode(cache_new_dir, new_dir);
412 smfs_clear_dentry(&cache_old_dentry);
413 smfs_clear_dentry(&cache_new_dentry);
418 struct inode_operations smfs_dir_iops = {
421 lookup_raw: smfs_lookup_raw, /* BKL held */
422 link: smfs_link, /* BKL held */
423 unlink: smfs_unlink, /* BKL held */
424 symlink: smfs_symlink, /* BKL held */
425 mkdir: smfs_mkdir, /* BKL held */
426 rmdir: smfs_rmdir, /* BKL held */
427 mknod: smfs_mknod, /* BKL held */
428 rename: smfs_rename, /* BKL held */
429 setxattr: smfs_setxattr, /* BKL held */
430 getxattr: smfs_getxattr, /* BKL held */
431 listxattr: smfs_listxattr, /* BKL held */
432 removexattr: smfs_removexattr, /* BKL held */
435 static ssize_t smfs_read_dir(struct file *filp, char *buf,
436 size_t size, loff_t *ppos)
438 struct dentry *dentry = filp->f_dentry;
439 struct inode *cache_inode = NULL;
440 struct file open_file;
441 struct dentry open_dentry;
444 cache_inode = I2CI(dentry->d_inode);
449 smfs_prepare_cachefile(dentry->d_inode, filp, cache_inode,
450 &open_file, &open_dentry);
452 if (cache_inode->i_fop->read)
453 rc = cache_inode->i_fop->read(&open_file, buf, size, ppos);
455 smfs_update_file(filp, &open_file);
459 static int smfs_readdir(struct file * filp,
463 struct dentry *dentry = filp->f_dentry;
464 struct inode *cache_inode = NULL;
465 struct file open_file;
466 struct dentry open_dentry;
469 cache_inode = I2CI(dentry->d_inode);
474 smfs_prepare_cachefile(dentry->d_inode, filp, cache_inode,
475 &open_file, &open_dentry);
477 if (cache_inode->i_fop->readdir)
478 rc = cache_inode->i_fop->readdir(&open_file, dirent, filldir);
480 smfs_update_file(filp, &open_file);
484 struct file_operations smfs_dir_fops = {
486 readdir: smfs_readdir, /* BKL held */
487 ioctl: smfs_ioctl, /* BKL held */
488 fsync: smfs_fsync, /* BKL held */