5 #define DEBUG_SUBSYSTEM S_SM
7 #include <linux/module.h>
8 #include <linux/kernel.h>
9 #include <linux/string.h>
10 #include <linux/slab.h>
11 #include <linux/stat.h>
12 #include <linux/unistd.h>
13 #include <linux/pagemap.h>
14 #include "smfs_internal.h"
16 /* instantiate a file handle to the cache file */
17 void smfs_prepare_cachefile(struct inode *inode,
19 struct inode *cache_inode,
20 struct file *cache_file,
21 struct dentry *cache_dentry)
24 cache_file->f_pos = file->f_pos;
25 cache_file->f_mode = file->f_mode;
26 cache_file->f_flags = file->f_flags;
27 cache_file->f_count = file->f_count;
28 cache_file->f_owner = file->f_owner;
29 cache_file->f_error = file->f_error;
30 cache_file->f_op = inode->i_fop;
31 cache_file->f_dentry = cache_dentry;
32 cache_file->f_dentry->d_inode = cache_inode;
33 cache_file->f_vfsmnt = file->f_vfsmnt;
34 cache_file->private_data = file->private_data;
35 cache_file->f_it = file->f_it;
36 cache_file->f_reada = file->f_reada;
37 cache_file->f_ramax = file->f_ramax;
38 cache_file->f_raend = file->f_raend;
39 cache_file->f_ralen = file->f_ralen;
40 cache_file->f_rawin = file->f_rawin;
43 /* update file structs*/
44 void smfs_update_file(struct file *file,
45 struct file *cache_file)
48 file->f_pos = cache_file->f_pos;
49 file->f_mode = cache_file->f_mode;
50 file->f_flags = cache_file->f_flags;
51 file->f_count = cache_file->f_count;
52 file->f_owner = cache_file->f_owner;
53 file->f_reada = cache_file->f_reada;
54 file->f_ramax = cache_file->f_ramax;
55 file->f_raend = cache_file->f_raend;
56 file->f_ralen = cache_file->f_ralen;
57 file->f_rawin = cache_file->f_rawin;
61 static ssize_t smfs_write (struct file *filp, const char *buf,
62 size_t count, loff_t *ppos)
64 struct inode *cache_inode;
65 struct dentry *dentry = filp->f_dentry;
66 struct inode *inode = dentry->d_inode;
67 struct file open_file;
68 struct dentry open_dentry;
75 cache_inode = I2CI(inode);
80 if (ppos != &(filp->f_pos)) {
81 cache_ppos = &tmp_ppos;
83 cache_ppos = &open_file.f_pos;
87 smfs_prepare_cachefile(inode, filp, cache_inode,
88 &open_file, &open_dentry);
89 if (cache_inode->i_fop->write)
90 rc = cache_inode->i_fop->write(&open_file, buf, count, cache_ppos);
93 duplicate_inode(cache_inode, inode);
94 smfs_update_file(filp, &open_file);
99 int smfs_ioctl(struct inode * inode, struct file * filp,
100 unsigned int cmd, unsigned long arg)
102 struct inode *cache_inode;
103 struct dentry *dentry = filp->f_dentry;
104 struct file open_file;
105 struct dentry open_dentry;
110 cache_inode = I2CI(dentry->d_inode);
114 smfs_prepare_cachefile(inode, filp, cache_inode,
115 &open_file, &open_dentry);
117 if (cache_inode->i_fop->ioctl)
118 rc = cache_inode->i_fop->ioctl(cache_inode, &open_file, cmd, arg);
120 duplicate_inode(cache_inode, inode);
121 smfs_update_file(filp, &open_file);
125 static ssize_t smfs_read (struct file *filp, char *buf,
126 size_t count, loff_t *ppos)
128 struct inode *cache_inode;
129 struct dentry *dentry = filp->f_dentry;
130 struct inode *inode = dentry->d_inode;
131 struct file open_file;
132 struct dentry open_dentry;
139 cache_inode = I2CI(dentry->d_inode);
143 if (ppos != &(filp->f_pos)) {
144 cache_ppos = &tmp_ppos;
146 cache_ppos = &open_file.f_pos;
151 smfs_prepare_cachefile(inode, filp, cache_inode,
152 &open_file, &open_dentry);
155 if (cache_inode->i_fop->read)
156 rc = cache_inode->i_fop->read(&open_file, buf, count, cache_ppos);
159 duplicate_inode(cache_inode, inode);
160 smfs_update_file(filp, &open_file);
164 static loff_t smfs_llseek(struct file *file,
168 struct inode *cache_inode;
169 struct dentry *dentry = file->f_dentry;
170 struct file open_file;
171 struct dentry open_dentry;
176 cache_inode = I2CI(dentry->d_inode);
180 smfs_prepare_cachefile(dentry->d_inode, file, cache_inode,
181 &open_file, &open_dentry);
183 if (cache_inode->i_fop->llseek)
184 rc = cache_inode->i_fop->llseek(&open_file, offset, origin);
186 duplicate_inode(cache_inode, dentry->d_inode);
187 smfs_update_file(file, &open_file);
192 static int smfs_mmap(struct file * file, struct vm_area_struct * vma)
194 struct inode *inode = file->f_dentry->d_inode;
195 struct inode *cache_inode = NULL;
196 struct file open_file;
197 struct dentry open_dentry;
200 cache_inode = I2CI(inode);
204 smfs_prepare_cachefile(inode, file, cache_inode,
205 &open_file, &open_dentry);
207 if (cache_inode->i_mapping == &cache_inode->i_data)
208 inode->i_mapping = cache_inode->i_mapping;
210 if (cache_inode->i_fop->mmap)
211 rc = cache_inode->i_fop->mmap(&open_file, vma);
213 duplicate_inode(cache_inode, inode);
214 smfs_update_file(file, &open_file);
219 static int smfs_open(struct inode * inode, struct file * filp)
221 struct inode *cache_inode = NULL;
222 struct file open_file;
223 struct dentry open_dentry;
226 cache_inode = I2CI(inode);
230 smfs_prepare_cachefile(inode, filp, cache_inode,
231 &open_file, &open_dentry);
233 if (cache_inode->i_fop->open)
234 rc = cache_inode->i_fop->open(cache_inode, &open_file);
236 duplicate_inode(cache_inode, inode);
237 smfs_update_file(filp, &open_file);
242 static int smfs_release(struct inode * inode, struct file * filp)
244 struct inode *cache_inode = NULL;
245 struct file open_file;
246 struct dentry open_dentry;
249 cache_inode = I2CI(inode);
253 smfs_prepare_cachefile(inode, filp, cache_inode,
254 &open_file, &open_dentry);
256 if (cache_inode->i_fop->release)
257 rc = cache_inode->i_fop->release(cache_inode, &open_file);
259 duplicate_inode(cache_inode, inode);
260 smfs_update_file(filp, &open_file);
264 int smfs_fsync(struct file * file,
265 struct dentry *dentry,
268 struct inode *inode = dentry->d_inode;
269 struct inode *cache_inode;
270 struct file open_file;
271 struct dentry open_dentry;
274 cache_inode = I2CI(inode);
278 smfs_prepare_cachefile(inode, file, cache_inode,
279 &open_file, &open_dentry);
281 if (cache_inode->i_fop->fsync)
282 rc = cache_inode->i_fop->fsync(&open_file, &open_dentry, datasync);
284 duplicate_inode(cache_inode, inode);
285 smfs_update_file(file, &open_file);
290 struct file_operations smfs_file_fops = {
297 release: smfs_release,
301 static void smfs_prepare_cache_dentry(struct dentry *dentry, struct inode *inode)
303 atomic_set(&dentry->d_count, 1);
304 dentry->d_vfs_flags = 0;
306 dentry->d_inode = inode;
308 dentry->d_fsdata = NULL;
309 dentry->d_mounted = 0;
310 INIT_LIST_HEAD(&dentry->d_hash);
311 INIT_LIST_HEAD(&dentry->d_lru);
312 INIT_LIST_HEAD(&dentry->d_subdirs);
313 INIT_LIST_HEAD(&dentry->d_alias);
316 static void smfs_truncate(struct inode * inode)
318 struct inode *cache_inode;
320 cache_inode = I2CI(inode);
325 if (cache_inode->i_op->truncate)
326 cache_inode->i_op->truncate(cache_inode);
328 duplicate_inode(inode, cache_inode);
333 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
335 struct inode *cache_inode;
336 struct dentry open_dentry;
340 cache_inode = I2CI(dentry->d_inode);
344 smfs_prepare_cache_dentry(&open_dentry, cache_inode);
346 if (cache_inode->i_op->setattr)
347 rc = cache_inode->i_op->setattr(&open_dentry, attr);
349 duplicate_inode(cache_inode, dentry->d_inode);
354 int smfs_setxattr(struct dentry *dentry, const char *name,
355 const void *value, size_t size, int flags)
357 struct inode *cache_inode;
358 struct dentry open_dentry;
361 cache_inode = I2CI(dentry->d_inode);
366 smfs_prepare_cache_dentry(&open_dentry, cache_inode);
368 if (cache_inode->i_op->setattr)
369 rc = cache_inode->i_op->setxattr(&open_dentry, name, value, size, flags);
371 duplicate_inode(cache_inode, dentry->d_inode);
375 int smfs_getxattr(struct dentry *dentry, const char *name,
376 void *buffer, size_t size)
378 struct inode *cache_inode;
379 struct dentry open_dentry;
382 cache_inode = I2CI(dentry->d_inode);
387 smfs_prepare_cache_dentry(&open_dentry, cache_inode);
389 if (cache_inode->i_op->setattr)
390 rc = cache_inode->i_op->getxattr(&open_dentry, name, buffer, size);
392 duplicate_inode(cache_inode, dentry->d_inode);
396 ssize_t smfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
398 struct inode *cache_inode;
399 struct dentry open_dentry;
402 cache_inode = I2CI(dentry->d_inode);
407 smfs_prepare_cache_dentry(&open_dentry, cache_inode);
409 if (cache_inode->i_op->listxattr)
410 rc = cache_inode->i_op->listxattr(&open_dentry, buffer, size);
412 duplicate_inode(cache_inode, dentry->d_inode);
416 int smfs_removexattr(struct dentry *dentry, const char *name)
418 struct inode *cache_inode;
419 struct dentry open_dentry;
422 cache_inode = I2CI(dentry->d_inode);
427 smfs_prepare_cache_dentry(&open_dentry, cache_inode);
429 if (cache_inode->i_op->removexattr)
430 rc = cache_inode->i_op->removexattr(&open_dentry, name);
432 duplicate_inode(cache_inode, dentry->d_inode);
436 struct inode_operations smfs_file_iops = {
437 truncate: smfs_truncate, /* BKL held */
438 setattr: smfs_setattr, /* BKL held */
439 setxattr: smfs_setxattr, /* BKL held */
440 getxattr: smfs_getxattr, /* BKL held */
441 listxattr: smfs_listxattr, /* BKL held */
442 removexattr: smfs_removexattr, /* BKL held */