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 | ||
0afacde3 | 36 | #include <asm/prom.h> |
67207b96 AB |
37 | #include <asm/semaphore.h> |
38 | #include <asm/spu.h> | |
ccf17e9d | 39 | #include <asm/spu_priv1.h> |
67207b96 AB |
40 | #include <asm/uaccess.h> |
41 | ||
42 | #include "spufs.h" | |
43 | ||
e18b890b | 44 | static struct kmem_cache *spufs_inode_cache; |
c6730ed4 | 45 | char *isolated_loader; |
8b0d3121 | 46 | static int isolated_loader_size; |
67207b96 | 47 | |
67207b96 AB |
48 | static struct inode * |
49 | spufs_alloc_inode(struct super_block *sb) | |
50 | { | |
51 | struct spufs_inode_info *ei; | |
52 | ||
e94b1766 | 53 | ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL); |
67207b96 AB |
54 | if (!ei) |
55 | return NULL; | |
6263203e AB |
56 | |
57 | ei->i_gang = NULL; | |
58 | ei->i_ctx = NULL; | |
43c2bbd9 | 59 | ei->i_openers = 0; |
6263203e | 60 | |
67207b96 AB |
61 | return &ei->vfs_inode; |
62 | } | |
63 | ||
64 | static void | |
65 | spufs_destroy_inode(struct inode *inode) | |
66 | { | |
67 | kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); | |
68 | } | |
69 | ||
70 | static void | |
e18b890b | 71 | spufs_init_once(void *p, struct kmem_cache * cachep, unsigned long flags) |
67207b96 AB |
72 | { |
73 | struct spufs_inode_info *ei = p; | |
74 | ||
a35afb83 | 75 | inode_init_once(&ei->vfs_inode); |
67207b96 AB |
76 | } |
77 | ||
78 | static struct inode * | |
79 | spufs_new_inode(struct super_block *sb, int mode) | |
80 | { | |
81 | struct inode *inode; | |
82 | ||
83 | inode = new_inode(sb); | |
84 | if (!inode) | |
85 | goto out; | |
86 | ||
87 | inode->i_mode = mode; | |
88 | inode->i_uid = current->fsuid; | |
89 | inode->i_gid = current->fsgid; | |
67207b96 AB |
90 | inode->i_blocks = 0; |
91 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
92 | out: | |
93 | return inode; | |
94 | } | |
95 | ||
96 | static int | |
97 | spufs_setattr(struct dentry *dentry, struct iattr *attr) | |
98 | { | |
99 | struct inode *inode = dentry->d_inode; | |
100 | ||
67207b96 AB |
101 | if ((attr->ia_valid & ATTR_SIZE) && |
102 | (attr->ia_size != inode->i_size)) | |
103 | return -EINVAL; | |
104 | return inode_setattr(inode, attr); | |
105 | } | |
106 | ||
107 | ||
108 | static int | |
109 | spufs_new_file(struct super_block *sb, struct dentry *dentry, | |
99ac48f5 | 110 | const struct file_operations *fops, int mode, |
67207b96 AB |
111 | struct spu_context *ctx) |
112 | { | |
113 | static struct inode_operations spufs_file_iops = { | |
67207b96 | 114 | .setattr = spufs_setattr, |
67207b96 AB |
115 | }; |
116 | struct inode *inode; | |
117 | int ret; | |
118 | ||
119 | ret = -ENOSPC; | |
120 | inode = spufs_new_inode(sb, S_IFREG | mode); | |
121 | if (!inode) | |
122 | goto out; | |
123 | ||
124 | ret = 0; | |
125 | inode->i_op = &spufs_file_iops; | |
126 | inode->i_fop = fops; | |
8e18e294 | 127 | inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); |
67207b96 AB |
128 | d_add(dentry, inode); |
129 | out: | |
130 | return ret; | |
131 | } | |
132 | ||
133 | static void | |
134 | spufs_delete_inode(struct inode *inode) | |
135 | { | |
6263203e AB |
136 | struct spufs_inode_info *ei = SPUFS_I(inode); |
137 | ||
138 | if (ei->i_ctx) | |
139 | put_spu_context(ei->i_ctx); | |
140 | if (ei->i_gang) | |
141 | put_spu_gang(ei->i_gang); | |
67207b96 AB |
142 | clear_inode(inode); |
143 | } | |
144 | ||
3f51dd91 | 145 | static void spufs_prune_dir(struct dentry *dir) |
67207b96 | 146 | { |
8b3d6663 | 147 | struct dentry *dentry, *tmp; |
6263203e | 148 | |
1b1dcc1b | 149 | mutex_lock(&dir->d_inode->i_mutex); |
c3a9aea7 | 150 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { |
8b3d6663 | 151 | spin_lock(&dcache_lock); |
67207b96 | 152 | spin_lock(&dentry->d_lock); |
8b3d6663 AB |
153 | if (!(d_unhashed(dentry)) && dentry->d_inode) { |
154 | dget_locked(dentry); | |
155 | __d_drop(dentry); | |
156 | spin_unlock(&dentry->d_lock); | |
3f51dd91 | 157 | simple_unlink(dir->d_inode, dentry); |
8b3d6663 AB |
158 | spin_unlock(&dcache_lock); |
159 | dput(dentry); | |
160 | } else { | |
161 | spin_unlock(&dentry->d_lock); | |
162 | spin_unlock(&dcache_lock); | |
163 | } | |
67207b96 | 164 | } |
3f51dd91 | 165 | shrink_dcache_parent(dir); |
1b1dcc1b | 166 | mutex_unlock(&dir->d_inode->i_mutex); |
3f51dd91 AB |
167 | } |
168 | ||
6263203e AB |
169 | /* Caller must hold parent->i_mutex */ |
170 | static int spufs_rmdir(struct inode *parent, struct dentry *dir) | |
3f51dd91 | 171 | { |
3f51dd91 | 172 | /* remove all entries */ |
6263203e | 173 | spufs_prune_dir(dir); |
8b3d6663 | 174 | |
6263203e | 175 | return simple_rmdir(parent, dir); |
67207b96 AB |
176 | } |
177 | ||
3f51dd91 AB |
178 | static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files, |
179 | int mode, struct spu_context *ctx) | |
180 | { | |
87873c86 | 181 | struct dentry *dentry, *tmp; |
3f51dd91 AB |
182 | int ret; |
183 | ||
184 | while (files->name && files->name[0]) { | |
185 | ret = -ENOMEM; | |
186 | dentry = d_alloc_name(dir, files->name); | |
187 | if (!dentry) | |
188 | goto out; | |
189 | ret = spufs_new_file(dir->d_sb, dentry, files->ops, | |
190 | files->mode & mode, ctx); | |
191 | if (ret) | |
192 | goto out; | |
193 | files++; | |
194 | } | |
195 | return 0; | |
196 | out: | |
87873c86 SS |
197 | /* |
198 | * remove all children from dir. dir->inode is not set so don't | |
199 | * just simply use spufs_prune_dir() and panic afterwards :) | |
200 | * dput() looks like it will do the right thing: | |
201 | * - dec parent's ref counter | |
202 | * - remove child from parent's child list | |
203 | * - free child's inode if possible | |
204 | * - free child | |
205 | */ | |
206 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { | |
207 | dput(dentry); | |
208 | } | |
209 | ||
210 | shrink_dcache_parent(dir); | |
3f51dd91 AB |
211 | return ret; |
212 | } | |
213 | ||
67207b96 AB |
214 | static int spufs_dir_close(struct inode *inode, struct file *file) |
215 | { | |
0309f02d | 216 | struct spu_context *ctx; |
6263203e AB |
217 | struct inode *parent; |
218 | struct dentry *dir; | |
67207b96 AB |
219 | int ret; |
220 | ||
b4d1ab58 | 221 | dir = file->f_path.dentry; |
6263203e AB |
222 | parent = dir->d_parent->d_inode; |
223 | ctx = SPUFS_I(dir->d_inode)->i_ctx; | |
c8ca0633 | 224 | |
6263203e AB |
225 | mutex_lock(&parent->i_mutex); |
226 | ret = spufs_rmdir(parent, dir); | |
227 | mutex_unlock(&parent->i_mutex); | |
67207b96 | 228 | WARN_ON(ret); |
c8ca0633 | 229 | |
0309f02d ME |
230 | /* We have to give up the mm_struct */ |
231 | spu_forget(ctx); | |
232 | ||
67207b96 AB |
233 | return dcache_dir_close(inode, file); |
234 | } | |
235 | ||
5dfe4c96 | 236 | const struct file_operations spufs_context_fops = { |
67207b96 AB |
237 | .open = dcache_dir_open, |
238 | .release = spufs_dir_close, | |
239 | .llseek = dcache_dir_lseek, | |
240 | .read = generic_read_dir, | |
241 | .readdir = dcache_readdir, | |
242 | .fsync = simple_sync_file, | |
243 | }; | |
bf1ab978 | 244 | EXPORT_SYMBOL_GPL(spufs_context_fops); |
67207b96 AB |
245 | |
246 | static int | |
9add11da AB |
247 | spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, |
248 | int mode) | |
67207b96 AB |
249 | { |
250 | int ret; | |
251 | struct inode *inode; | |
252 | struct spu_context *ctx; | |
253 | ||
254 | ret = -ENOSPC; | |
255 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
256 | if (!inode) | |
257 | goto out; | |
258 | ||
259 | if (dir->i_mode & S_ISGID) { | |
260 | inode->i_gid = dir->i_gid; | |
261 | inode->i_mode &= S_ISGID; | |
262 | } | |
6263203e | 263 | ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ |
67207b96 AB |
264 | SPUFS_I(inode)->i_ctx = ctx; |
265 | if (!ctx) | |
266 | goto out_iput; | |
267 | ||
9add11da | 268 | ctx->flags = flags; |
b8c295f9 | 269 | inode->i_op = &simple_dir_inode_operations; |
67207b96 | 270 | inode->i_fop = &simple_dir_operations; |
5737edd1 MN |
271 | if (flags & SPU_CREATE_NOSCHED) |
272 | ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, | |
273 | mode, ctx); | |
274 | else | |
275 | ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); | |
276 | ||
67207b96 AB |
277 | if (ret) |
278 | goto out_free_ctx; | |
279 | ||
280 | d_instantiate(dentry, inode); | |
281 | dget(dentry); | |
282 | dir->i_nlink++; | |
346f4d3c | 283 | dentry->d_inode->i_nlink++; |
67207b96 AB |
284 | goto out; |
285 | ||
286 | out_free_ctx: | |
89df0085 | 287 | spu_forget(ctx); |
67207b96 AB |
288 | put_spu_context(ctx); |
289 | out_iput: | |
290 | iput(inode); | |
291 | out: | |
292 | return ret; | |
293 | } | |
294 | ||
346f4d3c AB |
295 | static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) |
296 | { | |
297 | int ret; | |
298 | struct file *filp; | |
299 | ||
300 | ret = get_unused_fd(); | |
301 | if (ret < 0) { | |
302 | dput(dentry); | |
303 | mntput(mnt); | |
304 | goto out; | |
305 | } | |
306 | ||
307 | filp = dentry_open(dentry, mnt, O_RDONLY); | |
308 | if (IS_ERR(filp)) { | |
309 | put_unused_fd(ret); | |
310 | ret = PTR_ERR(filp); | |
311 | goto out; | |
312 | } | |
313 | ||
314 | filp->f_op = &spufs_context_fops; | |
315 | fd_install(ret, filp); | |
316 | out: | |
317 | return ret; | |
318 | } | |
319 | ||
8e68e2f2 AB |
320 | static struct spu_context * |
321 | spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, | |
322 | struct file *filp) | |
323 | { | |
324 | struct spu_context *tmp, *neighbor; | |
325 | int count, node; | |
326 | int aff_supp; | |
327 | ||
328 | aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, | |
329 | struct spu, cbe_list))->aff_list); | |
330 | ||
331 | if (!aff_supp) | |
332 | return ERR_PTR(-EINVAL); | |
333 | ||
334 | if (flags & SPU_CREATE_GANG) | |
335 | return ERR_PTR(-EINVAL); | |
336 | ||
337 | if (flags & SPU_CREATE_AFFINITY_MEM && | |
338 | gang->aff_ref_ctx && | |
339 | gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) | |
340 | return ERR_PTR(-EEXIST); | |
341 | ||
342 | if (gang->aff_flags & AFF_MERGED) | |
343 | return ERR_PTR(-EBUSY); | |
344 | ||
345 | neighbor = NULL; | |
346 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
347 | if (!filp || filp->f_op != &spufs_context_fops) | |
348 | return ERR_PTR(-EINVAL); | |
349 | ||
350 | neighbor = get_spu_context( | |
351 | SPUFS_I(filp->f_dentry->d_inode)->i_ctx); | |
352 | ||
353 | if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && | |
354 | !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && | |
355 | !list_entry(neighbor->aff_list.next, struct spu_context, | |
356 | aff_list)->aff_head) | |
357 | return ERR_PTR(-EEXIST); | |
358 | ||
359 | if (gang != neighbor->gang) | |
360 | return ERR_PTR(-EINVAL); | |
361 | ||
362 | count = 1; | |
363 | list_for_each_entry(tmp, &gang->aff_list_head, aff_list) | |
364 | count++; | |
365 | if (list_empty(&neighbor->aff_list)) | |
366 | count++; | |
367 | ||
368 | for (node = 0; node < MAX_NUMNODES; node++) { | |
369 | if ((cbe_spu_info[node].n_spus - atomic_read( | |
370 | &cbe_spu_info[node].reserved_spus)) >= count) | |
371 | break; | |
372 | } | |
373 | ||
374 | if (node == MAX_NUMNODES) | |
375 | return ERR_PTR(-EEXIST); | |
376 | } | |
377 | ||
378 | return neighbor; | |
379 | } | |
380 | ||
381 | static void | |
382 | spufs_set_affinity(unsigned int flags, struct spu_context *ctx, | |
383 | struct spu_context *neighbor) | |
384 | { | |
385 | if (flags & SPU_CREATE_AFFINITY_MEM) | |
386 | ctx->gang->aff_ref_ctx = ctx; | |
387 | ||
388 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
389 | if (list_empty(&neighbor->aff_list)) { | |
390 | list_add_tail(&neighbor->aff_list, | |
391 | &ctx->gang->aff_list_head); | |
392 | neighbor->aff_head = 1; | |
393 | } | |
394 | ||
395 | if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) | |
396 | || list_entry(neighbor->aff_list.next, struct spu_context, | |
397 | aff_list)->aff_head) { | |
398 | list_add(&ctx->aff_list, &neighbor->aff_list); | |
399 | } else { | |
400 | list_add_tail(&ctx->aff_list, &neighbor->aff_list); | |
401 | if (neighbor->aff_head) { | |
402 | neighbor->aff_head = 0; | |
403 | ctx->aff_head = 1; | |
404 | } | |
405 | } | |
406 | ||
407 | if (!ctx->gang->aff_ref_ctx) | |
408 | ctx->gang->aff_ref_ctx = ctx; | |
409 | } | |
410 | } | |
411 | ||
412 | static int | |
413 | spufs_create_context(struct inode *inode, struct dentry *dentry, | |
414 | struct vfsmount *mnt, int flags, int mode, | |
415 | struct file *aff_filp) | |
6263203e AB |
416 | { |
417 | int ret; | |
8e68e2f2 AB |
418 | int affinity; |
419 | struct spu_gang *gang; | |
420 | struct spu_context *neighbor; | |
6263203e | 421 | |
5737edd1 MN |
422 | ret = -EPERM; |
423 | if ((flags & SPU_CREATE_NOSCHED) && | |
424 | !capable(CAP_SYS_NICE)) | |
425 | goto out_unlock; | |
426 | ||
427 | ret = -EINVAL; | |
428 | if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) | |
429 | == SPU_CREATE_ISOLATE) | |
430 | goto out_unlock; | |
431 | ||
bd2e5f82 JK |
432 | ret = -ENODEV; |
433 | if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) | |
434 | goto out_unlock; | |
435 | ||
8e68e2f2 AB |
436 | gang = NULL; |
437 | neighbor = NULL; | |
438 | affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); | |
439 | if (affinity) { | |
440 | gang = SPUFS_I(inode)->i_gang; | |
441 | ret = -EINVAL; | |
442 | if (!gang) | |
443 | goto out_unlock; | |
444 | mutex_lock(&gang->aff_mutex); | |
445 | neighbor = spufs_assert_affinity(flags, gang, aff_filp); | |
446 | if (IS_ERR(neighbor)) { | |
447 | ret = PTR_ERR(neighbor); | |
448 | goto out_aff_unlock; | |
449 | } | |
450 | } | |
451 | ||
6263203e AB |
452 | ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); |
453 | if (ret) | |
8e68e2f2 AB |
454 | goto out_aff_unlock; |
455 | ||
456 | if (affinity) | |
457 | spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx, | |
458 | neighbor); | |
6263203e AB |
459 | |
460 | /* | |
461 | * get references for dget and mntget, will be released | |
462 | * in error path of *_open(). | |
463 | */ | |
464 | ret = spufs_context_open(dget(dentry), mntget(mnt)); | |
465 | if (ret < 0) { | |
466 | WARN_ON(spufs_rmdir(inode, dentry)); | |
467 | mutex_unlock(&inode->i_mutex); | |
468 | spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); | |
469 | goto out; | |
470 | } | |
471 | ||
8e68e2f2 AB |
472 | out_aff_unlock: |
473 | if (affinity) | |
474 | mutex_unlock(&gang->aff_mutex); | |
6263203e AB |
475 | out_unlock: |
476 | mutex_unlock(&inode->i_mutex); | |
477 | out: | |
478 | dput(dentry); | |
479 | return ret; | |
480 | } | |
481 | ||
6263203e AB |
482 | static int |
483 | spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode) | |
484 | { | |
485 | int ret; | |
486 | struct inode *inode; | |
487 | struct spu_gang *gang; | |
488 | ||
489 | ret = -ENOSPC; | |
490 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
491 | if (!inode) | |
492 | goto out; | |
493 | ||
494 | ret = 0; | |
495 | if (dir->i_mode & S_ISGID) { | |
496 | inode->i_gid = dir->i_gid; | |
497 | inode->i_mode &= S_ISGID; | |
498 | } | |
499 | gang = alloc_spu_gang(); | |
500 | SPUFS_I(inode)->i_ctx = NULL; | |
501 | SPUFS_I(inode)->i_gang = gang; | |
502 | if (!gang) | |
503 | goto out_iput; | |
504 | ||
b8c295f9 | 505 | inode->i_op = &simple_dir_inode_operations; |
6263203e AB |
506 | inode->i_fop = &simple_dir_operations; |
507 | ||
508 | d_instantiate(dentry, inode); | |
6263203e AB |
509 | dir->i_nlink++; |
510 | dentry->d_inode->i_nlink++; | |
511 | return ret; | |
512 | ||
513 | out_iput: | |
514 | iput(inode); | |
515 | out: | |
516 | return ret; | |
517 | } | |
518 | ||
519 | static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) | |
520 | { | |
521 | int ret; | |
522 | struct file *filp; | |
523 | ||
524 | ret = get_unused_fd(); | |
525 | if (ret < 0) { | |
526 | dput(dentry); | |
527 | mntput(mnt); | |
528 | goto out; | |
529 | } | |
530 | ||
531 | filp = dentry_open(dentry, mnt, O_RDONLY); | |
532 | if (IS_ERR(filp)) { | |
533 | put_unused_fd(ret); | |
534 | ret = PTR_ERR(filp); | |
535 | goto out; | |
536 | } | |
537 | ||
877907d3 | 538 | filp->f_op = &simple_dir_operations; |
6263203e AB |
539 | fd_install(ret, filp); |
540 | out: | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int spufs_create_gang(struct inode *inode, | |
545 | struct dentry *dentry, | |
546 | struct vfsmount *mnt, int mode) | |
547 | { | |
548 | int ret; | |
549 | ||
550 | ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); | |
551 | if (ret) | |
552 | goto out; | |
553 | ||
554 | /* | |
555 | * get references for dget and mntget, will be released | |
556 | * in error path of *_open(). | |
557 | */ | |
558 | ret = spufs_gang_open(dget(dentry), mntget(mnt)); | |
877907d3 JK |
559 | if (ret < 0) { |
560 | int err = simple_rmdir(inode, dentry); | |
561 | WARN_ON(err); | |
562 | } | |
6263203e AB |
563 | |
564 | out: | |
565 | mutex_unlock(&inode->i_mutex); | |
566 | dput(dentry); | |
567 | return ret; | |
568 | } | |
569 | ||
570 | ||
346f4d3c AB |
571 | static struct file_system_type spufs_type; |
572 | ||
8e68e2f2 AB |
573 | long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode, |
574 | struct file *filp) | |
67207b96 AB |
575 | { |
576 | struct dentry *dentry; | |
67207b96 AB |
577 | int ret; |
578 | ||
67207b96 | 579 | ret = -EINVAL; |
6263203e AB |
580 | /* check if we are on spufs */ |
581 | if (nd->dentry->d_sb->s_type != &spufs_type) | |
67207b96 AB |
582 | goto out; |
583 | ||
6263203e | 584 | /* don't accept undefined flags */ |
9add11da | 585 | if (flags & (~SPU_CREATE_FLAG_ALL)) |
c9832948 | 586 | goto out; |
587 | ||
6263203e AB |
588 | /* only threads can be underneath a gang */ |
589 | if (nd->dentry != nd->dentry->d_sb->s_root) { | |
590 | if ((flags & SPU_CREATE_GANG) || | |
591 | !SPUFS_I(nd->dentry->d_inode)->i_gang) | |
592 | goto out; | |
593 | } | |
594 | ||
67207b96 AB |
595 | dentry = lookup_create(nd, 1); |
596 | ret = PTR_ERR(dentry); | |
597 | if (IS_ERR(dentry)) | |
598 | goto out_dir; | |
599 | ||
600 | ret = -EEXIST; | |
601 | if (dentry->d_inode) | |
602 | goto out_dput; | |
603 | ||
604 | mode &= ~current->fs->umask; | |
67207b96 | 605 | |
6263203e AB |
606 | if (flags & SPU_CREATE_GANG) |
607 | return spufs_create_gang(nd->dentry->d_inode, | |
608 | dentry, nd->mnt, mode); | |
609 | else | |
610 | return spufs_create_context(nd->dentry->d_inode, | |
8e68e2f2 | 611 | dentry, nd->mnt, flags, mode, filp); |
67207b96 AB |
612 | |
613 | out_dput: | |
614 | dput(dentry); | |
615 | out_dir: | |
1b1dcc1b | 616 | mutex_unlock(&nd->dentry->d_inode->i_mutex); |
67207b96 AB |
617 | out: |
618 | return ret; | |
619 | } | |
620 | ||
621 | /* File system initialization */ | |
622 | enum { | |
f11f5ee7 | 623 | Opt_uid, Opt_gid, Opt_mode, Opt_err, |
67207b96 AB |
624 | }; |
625 | ||
626 | static match_table_t spufs_tokens = { | |
f11f5ee7 JK |
627 | { Opt_uid, "uid=%d" }, |
628 | { Opt_gid, "gid=%d" }, | |
629 | { Opt_mode, "mode=%o" }, | |
630 | { Opt_err, NULL }, | |
67207b96 AB |
631 | }; |
632 | ||
633 | static int | |
634 | spufs_parse_options(char *options, struct inode *root) | |
635 | { | |
636 | char *p; | |
637 | substring_t args[MAX_OPT_ARGS]; | |
638 | ||
639 | while ((p = strsep(&options, ",")) != NULL) { | |
640 | int token, option; | |
641 | ||
642 | if (!*p) | |
643 | continue; | |
644 | ||
645 | token = match_token(p, spufs_tokens, args); | |
646 | switch (token) { | |
647 | case Opt_uid: | |
648 | if (match_int(&args[0], &option)) | |
649 | return 0; | |
650 | root->i_uid = option; | |
651 | break; | |
652 | case Opt_gid: | |
653 | if (match_int(&args[0], &option)) | |
654 | return 0; | |
655 | root->i_gid = option; | |
656 | break; | |
f11f5ee7 JK |
657 | case Opt_mode: |
658 | if (match_octal(&args[0], &option)) | |
659 | return 0; | |
660 | root->i_mode = option | S_IFDIR; | |
661 | break; | |
67207b96 AB |
662 | default: |
663 | return 0; | |
664 | } | |
665 | } | |
666 | return 1; | |
667 | } | |
668 | ||
db1384b4 AM |
669 | static void spufs_exit_isolated_loader(void) |
670 | { | |
8b0d3121 SS |
671 | free_pages((unsigned long) isolated_loader, |
672 | get_order(isolated_loader_size)); | |
db1384b4 AM |
673 | } |
674 | ||
0afacde3 | 675 | static void |
676 | spufs_init_isolated_loader(void) | |
677 | { | |
678 | struct device_node *dn; | |
679 | const char *loader; | |
680 | int size; | |
681 | ||
682 | dn = of_find_node_by_path("/spu-isolation"); | |
683 | if (!dn) | |
684 | return; | |
685 | ||
e2eb6392 | 686 | loader = of_get_property(dn, "loader", &size); |
0afacde3 | 687 | if (!loader) |
688 | return; | |
689 | ||
8b0d3121 SS |
690 | /* the loader must be align on a 16 byte boundary */ |
691 | isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size)); | |
0afacde3 | 692 | if (!isolated_loader) |
693 | return; | |
694 | ||
8b0d3121 | 695 | isolated_loader_size = size; |
0afacde3 | 696 | memcpy(isolated_loader, loader, size); |
697 | printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); | |
698 | } | |
699 | ||
67207b96 | 700 | static int |
8b3d6663 AB |
701 | spufs_create_root(struct super_block *sb, void *data) |
702 | { | |
67207b96 AB |
703 | struct inode *inode; |
704 | int ret; | |
705 | ||
8f18a158 AB |
706 | ret = -ENODEV; |
707 | if (!spu_management_ops) | |
708 | goto out; | |
709 | ||
67207b96 AB |
710 | ret = -ENOMEM; |
711 | inode = spufs_new_inode(sb, S_IFDIR | 0775); | |
712 | if (!inode) | |
713 | goto out; | |
714 | ||
b8c295f9 | 715 | inode->i_op = &simple_dir_inode_operations; |
67207b96 AB |
716 | inode->i_fop = &simple_dir_operations; |
717 | SPUFS_I(inode)->i_ctx = NULL; | |
718 | ||
719 | ret = -EINVAL; | |
720 | if (!spufs_parse_options(data, inode)) | |
721 | goto out_iput; | |
722 | ||
723 | ret = -ENOMEM; | |
724 | sb->s_root = d_alloc_root(inode); | |
725 | if (!sb->s_root) | |
726 | goto out_iput; | |
727 | ||
728 | return 0; | |
729 | out_iput: | |
730 | iput(inode); | |
731 | out: | |
732 | return ret; | |
733 | } | |
734 | ||
735 | static int | |
736 | spufs_fill_super(struct super_block *sb, void *data, int silent) | |
737 | { | |
738 | static struct super_operations s_ops = { | |
739 | .alloc_inode = spufs_alloc_inode, | |
740 | .destroy_inode = spufs_destroy_inode, | |
741 | .statfs = simple_statfs, | |
742 | .delete_inode = spufs_delete_inode, | |
743 | .drop_inode = generic_delete_inode, | |
744 | }; | |
745 | ||
746 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
747 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
748 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
749 | sb->s_magic = SPUFS_MAGIC; | |
750 | sb->s_op = &s_ops; | |
751 | ||
752 | return spufs_create_root(sb, data); | |
753 | } | |
754 | ||
454e2398 | 755 | static int |
67207b96 | 756 | spufs_get_sb(struct file_system_type *fstype, int flags, |
454e2398 | 757 | const char *name, void *data, struct vfsmount *mnt) |
67207b96 | 758 | { |
454e2398 | 759 | return get_sb_single(fstype, flags, data, spufs_fill_super, mnt); |
67207b96 AB |
760 | } |
761 | ||
762 | static struct file_system_type spufs_type = { | |
763 | .owner = THIS_MODULE, | |
764 | .name = "spufs", | |
765 | .get_sb = spufs_get_sb, | |
766 | .kill_sb = kill_litter_super, | |
767 | }; | |
768 | ||
e78b47a5 | 769 | static int __init spufs_init(void) |
67207b96 AB |
770 | { |
771 | int ret; | |
bf1ab978 | 772 | |
ccf17e9d JK |
773 | ret = -ENODEV; |
774 | if (!spu_management_ops) | |
775 | goto out; | |
776 | ||
67207b96 AB |
777 | ret = -ENOMEM; |
778 | spufs_inode_cache = kmem_cache_create("spufs_inode_cache", | |
779 | sizeof(struct spufs_inode_info), 0, | |
20c2df83 | 780 | SLAB_HWCACHE_ALIGN, spufs_init_once); |
67207b96 AB |
781 | |
782 | if (!spufs_inode_cache) | |
783 | goto out; | |
c99c1994 | 784 | ret = spu_sched_init(); |
67207b96 AB |
785 | if (ret) |
786 | goto out_cache; | |
c99c1994 AM |
787 | ret = register_filesystem(&spufs_type); |
788 | if (ret) | |
789 | goto out_sched; | |
67207b96 | 790 | ret = register_spu_syscalls(&spufs_calls); |
bf1ab978 DGM |
791 | if (ret) |
792 | goto out_fs; | |
0afacde3 | 793 | |
794 | spufs_init_isolated_loader(); | |
bf1ab978 | 795 | |
67207b96 | 796 | return 0; |
c99c1994 | 797 | |
67207b96 AB |
798 | out_fs: |
799 | unregister_filesystem(&spufs_type); | |
c99c1994 AM |
800 | out_sched: |
801 | spu_sched_exit(); | |
67207b96 AB |
802 | out_cache: |
803 | kmem_cache_destroy(spufs_inode_cache); | |
804 | out: | |
805 | return ret; | |
806 | } | |
807 | module_init(spufs_init); | |
808 | ||
e78b47a5 | 809 | static void __exit spufs_exit(void) |
67207b96 | 810 | { |
8b3d6663 | 811 | spu_sched_exit(); |
db1384b4 | 812 | spufs_exit_isolated_loader(); |
67207b96 AB |
813 | unregister_spu_syscalls(&spufs_calls); |
814 | unregister_filesystem(&spufs_type); | |
815 | kmem_cache_destroy(spufs_inode_cache); | |
816 | } | |
817 | module_exit(spufs_exit); | |
818 | ||
819 | MODULE_LICENSE("GPL"); | |
820 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); | |
821 |