Commit | Line | Data |
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67207b96 AB |
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> | |
346f4d3c | 29 | #include <linux/mount.h> |
67207b96 AB |
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 | ||
67207b96 AB |
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 | ||
67207b96 AB |
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 = { | |
67207b96 | 110 | .setattr = spufs_setattr, |
67207b96 AB |
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 | ||
3f51dd91 | 137 | static void spufs_prune_dir(struct dentry *dir) |
67207b96 | 138 | { |
8b3d6663 | 139 | struct dentry *dentry, *tmp; |
1b1dcc1b | 140 | mutex_lock(&dir->d_inode->i_mutex); |
3f51dd91 | 141 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) { |
8b3d6663 | 142 | spin_lock(&dcache_lock); |
67207b96 | 143 | spin_lock(&dentry->d_lock); |
8b3d6663 AB |
144 | if (!(d_unhashed(dentry)) && dentry->d_inode) { |
145 | dget_locked(dentry); | |
146 | __d_drop(dentry); | |
147 | spin_unlock(&dentry->d_lock); | |
3f51dd91 | 148 | simple_unlink(dir->d_inode, dentry); |
8b3d6663 AB |
149 | spin_unlock(&dcache_lock); |
150 | dput(dentry); | |
151 | } else { | |
152 | spin_unlock(&dentry->d_lock); | |
153 | spin_unlock(&dcache_lock); | |
154 | } | |
67207b96 | 155 | } |
3f51dd91 | 156 | shrink_dcache_parent(dir); |
1b1dcc1b | 157 | mutex_unlock(&dir->d_inode->i_mutex); |
3f51dd91 AB |
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 */ | |
1b1dcc1b | 165 | mutex_lock(&root->i_mutex); |
3f51dd91 | 166 | spufs_prune_dir(dir_dentry); |
1b1dcc1b | 167 | mutex_unlock(&root->i_mutex); |
8b3d6663 AB |
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 | ||
1b1dcc1b | 173 | /* XXX Do we need to hold i_mutex here ? */ |
c8ca0633 | 174 | return simple_rmdir(root, dir_dentry); |
67207b96 AB |
175 | } |
176 | ||
3f51dd91 AB |
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 | ||
67207b96 AB |
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; | |
c8ca0633 AB |
208 | |
209 | ret = spufs_rmdir(dir, dentry); | |
67207b96 | 210 | WARN_ON(ret); |
c8ca0633 | 211 | |
67207b96 AB |
212 | return dcache_dir_close(inode, file); |
213 | } | |
214 | ||
215 | struct inode_operations spufs_dir_inode_operations = { | |
216 | .lookup = simple_lookup, | |
217 | }; | |
218 | ||
e80358ad | 219 | struct file_operations spufs_context_fops = { |
67207b96 AB |
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 | } | |
8b3d6663 | 244 | ctx = alloc_spu_context(inode->i_mapping); |
67207b96 AB |
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++; | |
346f4d3c | 258 | dentry->d_inode->i_nlink++; |
67207b96 AB |
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 | ||
346f4d3c AB |
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 | ||
6ff730c3 AB |
296 | long spufs_create_thread(struct nameidata *nd, |
297 | unsigned int flags, mode_t mode) | |
67207b96 AB |
298 | { |
299 | struct dentry *dentry; | |
67207b96 AB |
300 | int ret; |
301 | ||
302 | /* need to be at the root of spufs */ | |
303 | ret = -EINVAL; | |
346f4d3c AB |
304 | if (nd->dentry->d_sb->s_type != &spufs_type || |
305 | nd->dentry != nd->dentry->d_sb->s_root) | |
67207b96 AB |
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 | ||
346f4d3c AB |
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)); | |
67207b96 | 327 | if (ret < 0) |
346f4d3c | 328 | spufs_rmdir(nd->dentry->d_inode, dentry); |
67207b96 AB |
329 | |
330 | out_dput: | |
331 | dput(dentry); | |
332 | out_dir: | |
1b1dcc1b | 333 | mutex_unlock(&nd->dentry->d_inode->i_mutex); |
67207b96 AB |
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 | |
8b3d6663 AB |
381 | spufs_create_root(struct super_block *sb, void *data) |
382 | { | |
67207b96 AB |
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; | |
8b3d6663 AB |
455 | if (spu_sched_init() != 0) { |
456 | kmem_cache_destroy(spufs_inode_cache); | |
457 | goto out; | |
458 | } | |
67207b96 AB |
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 | { | |
8b3d6663 | 477 | spu_sched_exit(); |
67207b96 AB |
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 |