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1 /*
2 * SPU file system
3 *
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
5 *
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include <linux/file.h>
24 #include <linux/fs.h>
25 #include <linux/backing-dev.h>
26 #include <linux/init.h>
27 #include <linux/ioctl.h>
28 #include <linux/module.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/pagemap.h>
32 #include <linux/poll.h>
33 #include <linux/slab.h>
34 #include <linux/parser.h>
35
36 #include <asm/io.h>
37 #include <asm/semaphore.h>
38 #include <asm/spu.h>
39 #include <asm/uaccess.h>
40
41 #include "spufs.h"
42
43 static kmem_cache_t *spufs_inode_cache;
44
45 static struct inode *
46 spufs_alloc_inode(struct super_block *sb)
47 {
48 struct spufs_inode_info *ei;
49
50 ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
51 if (!ei)
52 return NULL;
53 return &ei->vfs_inode;
54 }
55
56 static void
57 spufs_destroy_inode(struct inode *inode)
58 {
59 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
60 }
61
62 static void
63 spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
64 {
65 struct spufs_inode_info *ei = p;
66
67 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
68 SLAB_CTOR_CONSTRUCTOR) {
69 inode_init_once(&ei->vfs_inode);
70 }
71 }
72
73 static struct inode *
74 spufs_new_inode(struct super_block *sb, int mode)
75 {
76 struct inode *inode;
77
78 inode = new_inode(sb);
79 if (!inode)
80 goto out;
81
82 inode->i_mode = mode;
83 inode->i_uid = current->fsuid;
84 inode->i_gid = current->fsgid;
85 inode->i_blksize = PAGE_CACHE_SIZE;
86 inode->i_blocks = 0;
87 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
88 out:
89 return inode;
90 }
91
92 static int
93 spufs_setattr(struct dentry *dentry, struct iattr *attr)
94 {
95 struct inode *inode = dentry->d_inode;
96
97 if ((attr->ia_valid & ATTR_SIZE) &&
98 (attr->ia_size != inode->i_size))
99 return -EINVAL;
100 return inode_setattr(inode, attr);
101 }
102
103
104 static int
105 spufs_new_file(struct super_block *sb, struct dentry *dentry,
106 struct file_operations *fops, int mode,
107 struct spu_context *ctx)
108 {
109 static struct inode_operations spufs_file_iops = {
110 .setattr = spufs_setattr,
111 };
112 struct inode *inode;
113 int ret;
114
115 ret = -ENOSPC;
116 inode = spufs_new_inode(sb, S_IFREG | mode);
117 if (!inode)
118 goto out;
119
120 ret = 0;
121 inode->i_op = &spufs_file_iops;
122 inode->i_fop = fops;
123 inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
124 d_add(dentry, inode);
125 out:
126 return ret;
127 }
128
129 static void
130 spufs_delete_inode(struct inode *inode)
131 {
132 if (SPUFS_I(inode)->i_ctx)
133 put_spu_context(SPUFS_I(inode)->i_ctx);
134 clear_inode(inode);
135 }
136
137 static void spufs_prune_dir(struct dentry *dir)
138 {
139 struct dentry *dentry, *tmp;
140 mutex_lock(&dir->d_inode->i_mutex);
141 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
142 spin_lock(&dcache_lock);
143 spin_lock(&dentry->d_lock);
144 if (!(d_unhashed(dentry)) && dentry->d_inode) {
145 dget_locked(dentry);
146 __d_drop(dentry);
147 spin_unlock(&dentry->d_lock);
148 simple_unlink(dir->d_inode, dentry);
149 spin_unlock(&dcache_lock);
150 dput(dentry);
151 } else {
152 spin_unlock(&dentry->d_lock);
153 spin_unlock(&dcache_lock);
154 }
155 }
156 shrink_dcache_parent(dir);
157 mutex_unlock(&dir->d_inode->i_mutex);
158 }
159
160 static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
161 {
162 struct spu_context *ctx;
163
164 /* remove all entries */
165 mutex_lock(&root->i_mutex);
166 spufs_prune_dir(dir_dentry);
167 mutex_unlock(&root->i_mutex);
168
169 /* We have to give up the mm_struct */
170 ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
171 spu_forget(ctx);
172
173 /* XXX Do we need to hold i_mutex here ? */
174 return simple_rmdir(root, dir_dentry);
175 }
176
177 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
178 int mode, struct spu_context *ctx)
179 {
180 struct dentry *dentry;
181 int ret;
182
183 while (files->name && files->name[0]) {
184 ret = -ENOMEM;
185 dentry = d_alloc_name(dir, files->name);
186 if (!dentry)
187 goto out;
188 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
189 files->mode & mode, ctx);
190 if (ret)
191 goto out;
192 files++;
193 }
194 return 0;
195 out:
196 spufs_prune_dir(dir);
197 return ret;
198 }
199
200 static int spufs_dir_close(struct inode *inode, struct file *file)
201 {
202 struct inode *dir;
203 struct dentry *dentry;
204 int ret;
205
206 dentry = file->f_dentry;
207 dir = dentry->d_parent->d_inode;
208
209 ret = spufs_rmdir(dir, dentry);
210 WARN_ON(ret);
211
212 return dcache_dir_close(inode, file);
213 }
214
215 struct inode_operations spufs_dir_inode_operations = {
216 .lookup = simple_lookup,
217 };
218
219 struct file_operations spufs_context_fops = {
220 .open = dcache_dir_open,
221 .release = spufs_dir_close,
222 .llseek = dcache_dir_lseek,
223 .read = generic_read_dir,
224 .readdir = dcache_readdir,
225 .fsync = simple_sync_file,
226 };
227
228 static int
229 spufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
230 {
231 int ret;
232 struct inode *inode;
233 struct spu_context *ctx;
234
235 ret = -ENOSPC;
236 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
237 if (!inode)
238 goto out;
239
240 if (dir->i_mode & S_ISGID) {
241 inode->i_gid = dir->i_gid;
242 inode->i_mode &= S_ISGID;
243 }
244 ctx = alloc_spu_context(inode->i_mapping);
245 SPUFS_I(inode)->i_ctx = ctx;
246 if (!ctx)
247 goto out_iput;
248
249 inode->i_op = &spufs_dir_inode_operations;
250 inode->i_fop = &simple_dir_operations;
251 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
252 if (ret)
253 goto out_free_ctx;
254
255 d_instantiate(dentry, inode);
256 dget(dentry);
257 dir->i_nlink++;
258 dentry->d_inode->i_nlink++;
259 goto out;
260
261 out_free_ctx:
262 put_spu_context(ctx);
263 out_iput:
264 iput(inode);
265 out:
266 return ret;
267 }
268
269 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
270 {
271 int ret;
272 struct file *filp;
273
274 ret = get_unused_fd();
275 if (ret < 0) {
276 dput(dentry);
277 mntput(mnt);
278 goto out;
279 }
280
281 filp = dentry_open(dentry, mnt, O_RDONLY);
282 if (IS_ERR(filp)) {
283 put_unused_fd(ret);
284 ret = PTR_ERR(filp);
285 goto out;
286 }
287
288 filp->f_op = &spufs_context_fops;
289 fd_install(ret, filp);
290 out:
291 return ret;
292 }
293
294 static struct file_system_type spufs_type;
295
296 long spufs_create_thread(struct nameidata *nd,
297 unsigned int flags, mode_t mode)
298 {
299 struct dentry *dentry;
300 int ret;
301
302 /* need to be at the root of spufs */
303 ret = -EINVAL;
304 if (nd->dentry->d_sb->s_type != &spufs_type ||
305 nd->dentry != nd->dentry->d_sb->s_root)
306 goto out;
307
308 dentry = lookup_create(nd, 1);
309 ret = PTR_ERR(dentry);
310 if (IS_ERR(dentry))
311 goto out_dir;
312
313 ret = -EEXIST;
314 if (dentry->d_inode)
315 goto out_dput;
316
317 mode &= ~current->fs->umask;
318 ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
319 if (ret)
320 goto out_dput;
321
322 /*
323 * get references for dget and mntget, will be released
324 * in error path of *_open().
325 */
326 ret = spufs_context_open(dget(dentry), mntget(nd->mnt));
327 if (ret < 0)
328 spufs_rmdir(nd->dentry->d_inode, dentry);
329
330 out_dput:
331 dput(dentry);
332 out_dir:
333 mutex_unlock(&nd->dentry->d_inode->i_mutex);
334 out:
335 return ret;
336 }
337
338 /* File system initialization */
339 enum {
340 Opt_uid, Opt_gid, Opt_err,
341 };
342
343 static match_table_t spufs_tokens = {
344 { Opt_uid, "uid=%d" },
345 { Opt_gid, "gid=%d" },
346 { Opt_err, NULL },
347 };
348
349 static int
350 spufs_parse_options(char *options, struct inode *root)
351 {
352 char *p;
353 substring_t args[MAX_OPT_ARGS];
354
355 while ((p = strsep(&options, ",")) != NULL) {
356 int token, option;
357
358 if (!*p)
359 continue;
360
361 token = match_token(p, spufs_tokens, args);
362 switch (token) {
363 case Opt_uid:
364 if (match_int(&args[0], &option))
365 return 0;
366 root->i_uid = option;
367 break;
368 case Opt_gid:
369 if (match_int(&args[0], &option))
370 return 0;
371 root->i_gid = option;
372 break;
373 default:
374 return 0;
375 }
376 }
377 return 1;
378 }
379
380 static int
381 spufs_create_root(struct super_block *sb, void *data)
382 {
383 struct inode *inode;
384 int ret;
385
386 ret = -ENOMEM;
387 inode = spufs_new_inode(sb, S_IFDIR | 0775);
388 if (!inode)
389 goto out;
390
391 inode->i_op = &spufs_dir_inode_operations;
392 inode->i_fop = &simple_dir_operations;
393 SPUFS_I(inode)->i_ctx = NULL;
394
395 ret = -EINVAL;
396 if (!spufs_parse_options(data, inode))
397 goto out_iput;
398
399 ret = -ENOMEM;
400 sb->s_root = d_alloc_root(inode);
401 if (!sb->s_root)
402 goto out_iput;
403
404 return 0;
405 out_iput:
406 iput(inode);
407 out:
408 return ret;
409 }
410
411 static int
412 spufs_fill_super(struct super_block *sb, void *data, int silent)
413 {
414 static struct super_operations s_ops = {
415 .alloc_inode = spufs_alloc_inode,
416 .destroy_inode = spufs_destroy_inode,
417 .statfs = simple_statfs,
418 .delete_inode = spufs_delete_inode,
419 .drop_inode = generic_delete_inode,
420 };
421
422 sb->s_maxbytes = MAX_LFS_FILESIZE;
423 sb->s_blocksize = PAGE_CACHE_SIZE;
424 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
425 sb->s_magic = SPUFS_MAGIC;
426 sb->s_op = &s_ops;
427
428 return spufs_create_root(sb, data);
429 }
430
431 static struct super_block *
432 spufs_get_sb(struct file_system_type *fstype, int flags,
433 const char *name, void *data)
434 {
435 return get_sb_single(fstype, flags, data, spufs_fill_super);
436 }
437
438 static struct file_system_type spufs_type = {
439 .owner = THIS_MODULE,
440 .name = "spufs",
441 .get_sb = spufs_get_sb,
442 .kill_sb = kill_litter_super,
443 };
444
445 static int spufs_init(void)
446 {
447 int ret;
448 ret = -ENOMEM;
449 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
450 sizeof(struct spufs_inode_info), 0,
451 SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
452
453 if (!spufs_inode_cache)
454 goto out;
455 if (spu_sched_init() != 0) {
456 kmem_cache_destroy(spufs_inode_cache);
457 goto out;
458 }
459 ret = register_filesystem(&spufs_type);
460 if (ret)
461 goto out_cache;
462 ret = register_spu_syscalls(&spufs_calls);
463 if (ret)
464 goto out_fs;
465 return 0;
466 out_fs:
467 unregister_filesystem(&spufs_type);
468 out_cache:
469 kmem_cache_destroy(spufs_inode_cache);
470 out:
471 return ret;
472 }
473 module_init(spufs_init);
474
475 static void spufs_exit(void)
476 {
477 spu_sched_exit();
478 unregister_spu_syscalls(&spufs_calls);
479 unregister_filesystem(&spufs_type);
480 kmem_cache_destroy(spufs_inode_cache);
481 }
482 module_exit(spufs_exit);
483
484 MODULE_LICENSE("GPL");
485 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
486