Commit | Line | Data |
---|---|---|
4ac91378 | 1 | |
67207b96 AB |
2 | /* |
3 | * SPU file system | |
4 | * | |
5 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 | |
6 | * | |
7 | * Author: Arnd Bergmann <arndb@de.ibm.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/file.h> | |
25 | #include <linux/fs.h> | |
826be063 | 26 | #include <linux/fsnotify.h> |
67207b96 AB |
27 | #include <linux/backing-dev.h> |
28 | #include <linux/init.h> | |
29 | #include <linux/ioctl.h> | |
30 | #include <linux/module.h> | |
346f4d3c | 31 | #include <linux/mount.h> |
67207b96 AB |
32 | #include <linux/namei.h> |
33 | #include <linux/pagemap.h> | |
34 | #include <linux/poll.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/parser.h> | |
37 | ||
0afacde3 | 38 | #include <asm/prom.h> |
67207b96 | 39 | #include <asm/spu.h> |
ccf17e9d | 40 | #include <asm/spu_priv1.h> |
67207b96 AB |
41 | #include <asm/uaccess.h> |
42 | ||
43 | #include "spufs.h" | |
44 | ||
2c3e4787 JK |
45 | struct spufs_sb_info { |
46 | int debug; | |
47 | }; | |
48 | ||
e18b890b | 49 | static struct kmem_cache *spufs_inode_cache; |
c6730ed4 | 50 | char *isolated_loader; |
8b0d3121 | 51 | static int isolated_loader_size; |
67207b96 | 52 | |
2c3e4787 JK |
53 | static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb) |
54 | { | |
55 | return sb->s_fs_info; | |
56 | } | |
57 | ||
67207b96 AB |
58 | static struct inode * |
59 | spufs_alloc_inode(struct super_block *sb) | |
60 | { | |
61 | struct spufs_inode_info *ei; | |
62 | ||
e94b1766 | 63 | ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL); |
67207b96 AB |
64 | if (!ei) |
65 | return NULL; | |
6263203e AB |
66 | |
67 | ei->i_gang = NULL; | |
68 | ei->i_ctx = NULL; | |
43c2bbd9 | 69 | ei->i_openers = 0; |
6263203e | 70 | |
67207b96 AB |
71 | return &ei->vfs_inode; |
72 | } | |
73 | ||
74 | static void | |
75 | spufs_destroy_inode(struct inode *inode) | |
76 | { | |
77 | kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); | |
78 | } | |
79 | ||
80 | static void | |
51cc5068 | 81 | spufs_init_once(void *p) |
67207b96 AB |
82 | { |
83 | struct spufs_inode_info *ei = p; | |
84 | ||
a35afb83 | 85 | inode_init_once(&ei->vfs_inode); |
67207b96 AB |
86 | } |
87 | ||
88 | static struct inode * | |
89 | spufs_new_inode(struct super_block *sb, int mode) | |
90 | { | |
91 | struct inode *inode; | |
92 | ||
93 | inode = new_inode(sb); | |
94 | if (!inode) | |
95 | goto out; | |
96 | ||
97 | inode->i_mode = mode; | |
1330deb0 DH |
98 | inode->i_uid = current_fsuid(); |
99 | inode->i_gid = current_fsgid(); | |
67207b96 AB |
100 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
101 | out: | |
102 | return inode; | |
103 | } | |
104 | ||
105 | static int | |
106 | spufs_setattr(struct dentry *dentry, struct iattr *attr) | |
107 | { | |
108 | struct inode *inode = dentry->d_inode; | |
109 | ||
67207b96 AB |
110 | if ((attr->ia_valid & ATTR_SIZE) && |
111 | (attr->ia_size != inode->i_size)) | |
112 | return -EINVAL; | |
1025774c CH |
113 | setattr_copy(inode, attr); |
114 | mark_inode_dirty(inode); | |
115 | return 0; | |
67207b96 AB |
116 | } |
117 | ||
118 | ||
119 | static int | |
120 | spufs_new_file(struct super_block *sb, struct dentry *dentry, | |
99ac48f5 | 121 | const struct file_operations *fops, int mode, |
23d893f5 | 122 | size_t size, struct spu_context *ctx) |
67207b96 | 123 | { |
6e1d5dcc | 124 | static const struct inode_operations spufs_file_iops = { |
67207b96 | 125 | .setattr = spufs_setattr, |
67207b96 AB |
126 | }; |
127 | struct inode *inode; | |
128 | int ret; | |
129 | ||
130 | ret = -ENOSPC; | |
131 | inode = spufs_new_inode(sb, S_IFREG | mode); | |
132 | if (!inode) | |
133 | goto out; | |
134 | ||
135 | ret = 0; | |
136 | inode->i_op = &spufs_file_iops; | |
137 | inode->i_fop = fops; | |
23d893f5 | 138 | inode->i_size = size; |
8e18e294 | 139 | inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); |
67207b96 AB |
140 | d_add(dentry, inode); |
141 | out: | |
142 | return ret; | |
143 | } | |
144 | ||
145 | static void | |
146 | spufs_delete_inode(struct inode *inode) | |
147 | { | |
6263203e AB |
148 | struct spufs_inode_info *ei = SPUFS_I(inode); |
149 | ||
150 | if (ei->i_ctx) | |
151 | put_spu_context(ei->i_ctx); | |
152 | if (ei->i_gang) | |
153 | put_spu_gang(ei->i_gang); | |
67207b96 AB |
154 | clear_inode(inode); |
155 | } | |
156 | ||
3f51dd91 | 157 | static void spufs_prune_dir(struct dentry *dir) |
67207b96 | 158 | { |
8b3d6663 | 159 | struct dentry *dentry, *tmp; |
6263203e | 160 | |
1b1dcc1b | 161 | mutex_lock(&dir->d_inode->i_mutex); |
c3a9aea7 | 162 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { |
8b3d6663 | 163 | spin_lock(&dcache_lock); |
67207b96 | 164 | spin_lock(&dentry->d_lock); |
8b3d6663 AB |
165 | if (!(d_unhashed(dentry)) && dentry->d_inode) { |
166 | dget_locked(dentry); | |
167 | __d_drop(dentry); | |
168 | spin_unlock(&dentry->d_lock); | |
3f51dd91 | 169 | simple_unlink(dir->d_inode, dentry); |
8b3d6663 AB |
170 | spin_unlock(&dcache_lock); |
171 | dput(dentry); | |
172 | } else { | |
173 | spin_unlock(&dentry->d_lock); | |
174 | spin_unlock(&dcache_lock); | |
175 | } | |
67207b96 | 176 | } |
3f51dd91 | 177 | shrink_dcache_parent(dir); |
1b1dcc1b | 178 | mutex_unlock(&dir->d_inode->i_mutex); |
3f51dd91 AB |
179 | } |
180 | ||
6263203e AB |
181 | /* Caller must hold parent->i_mutex */ |
182 | static int spufs_rmdir(struct inode *parent, struct dentry *dir) | |
3f51dd91 | 183 | { |
3f51dd91 | 184 | /* remove all entries */ |
6263203e | 185 | spufs_prune_dir(dir); |
c443acab | 186 | d_drop(dir); |
8b3d6663 | 187 | |
6263203e | 188 | return simple_rmdir(parent, dir); |
67207b96 AB |
189 | } |
190 | ||
74254647 JK |
191 | static int spufs_fill_dir(struct dentry *dir, |
192 | const struct spufs_tree_descr *files, int mode, | |
193 | struct spu_context *ctx) | |
3f51dd91 | 194 | { |
87873c86 | 195 | struct dentry *dentry, *tmp; |
3f51dd91 AB |
196 | int ret; |
197 | ||
198 | while (files->name && files->name[0]) { | |
199 | ret = -ENOMEM; | |
200 | dentry = d_alloc_name(dir, files->name); | |
201 | if (!dentry) | |
202 | goto out; | |
203 | ret = spufs_new_file(dir->d_sb, dentry, files->ops, | |
23d893f5 | 204 | files->mode & mode, files->size, ctx); |
3f51dd91 AB |
205 | if (ret) |
206 | goto out; | |
207 | files++; | |
208 | } | |
209 | return 0; | |
210 | out: | |
87873c86 SS |
211 | /* |
212 | * remove all children from dir. dir->inode is not set so don't | |
213 | * just simply use spufs_prune_dir() and panic afterwards :) | |
214 | * dput() looks like it will do the right thing: | |
215 | * - dec parent's ref counter | |
216 | * - remove child from parent's child list | |
217 | * - free child's inode if possible | |
218 | * - free child | |
219 | */ | |
220 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { | |
221 | dput(dentry); | |
222 | } | |
223 | ||
224 | shrink_dcache_parent(dir); | |
3f51dd91 AB |
225 | return ret; |
226 | } | |
227 | ||
67207b96 AB |
228 | static int spufs_dir_close(struct inode *inode, struct file *file) |
229 | { | |
0309f02d | 230 | struct spu_context *ctx; |
6263203e AB |
231 | struct inode *parent; |
232 | struct dentry *dir; | |
67207b96 AB |
233 | int ret; |
234 | ||
b4d1ab58 | 235 | dir = file->f_path.dentry; |
6263203e AB |
236 | parent = dir->d_parent->d_inode; |
237 | ctx = SPUFS_I(dir->d_inode)->i_ctx; | |
c8ca0633 | 238 | |
02539d71 | 239 | mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT); |
6263203e AB |
240 | ret = spufs_rmdir(parent, dir); |
241 | mutex_unlock(&parent->i_mutex); | |
67207b96 | 242 | WARN_ON(ret); |
c8ca0633 | 243 | |
0309f02d ME |
244 | /* We have to give up the mm_struct */ |
245 | spu_forget(ctx); | |
246 | ||
67207b96 AB |
247 | return dcache_dir_close(inode, file); |
248 | } | |
249 | ||
5dfe4c96 | 250 | const struct file_operations spufs_context_fops = { |
67207b96 AB |
251 | .open = dcache_dir_open, |
252 | .release = spufs_dir_close, | |
253 | .llseek = dcache_dir_lseek, | |
254 | .read = generic_read_dir, | |
255 | .readdir = dcache_readdir, | |
1b061d92 | 256 | .fsync = noop_fsync, |
67207b96 | 257 | }; |
bf1ab978 | 258 | EXPORT_SYMBOL_GPL(spufs_context_fops); |
67207b96 AB |
259 | |
260 | static int | |
9add11da AB |
261 | spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, |
262 | int mode) | |
67207b96 AB |
263 | { |
264 | int ret; | |
265 | struct inode *inode; | |
266 | struct spu_context *ctx; | |
267 | ||
268 | ret = -ENOSPC; | |
269 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
270 | if (!inode) | |
271 | goto out; | |
272 | ||
273 | if (dir->i_mode & S_ISGID) { | |
274 | inode->i_gid = dir->i_gid; | |
275 | inode->i_mode &= S_ISGID; | |
276 | } | |
6263203e | 277 | ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ |
67207b96 AB |
278 | SPUFS_I(inode)->i_ctx = ctx; |
279 | if (!ctx) | |
280 | goto out_iput; | |
281 | ||
9add11da | 282 | ctx->flags = flags; |
b8c295f9 | 283 | inode->i_op = &simple_dir_inode_operations; |
67207b96 | 284 | inode->i_fop = &simple_dir_operations; |
5737edd1 MN |
285 | if (flags & SPU_CREATE_NOSCHED) |
286 | ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, | |
287 | mode, ctx); | |
288 | else | |
289 | ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); | |
290 | ||
67207b96 AB |
291 | if (ret) |
292 | goto out_free_ctx; | |
293 | ||
2c3e4787 JK |
294 | if (spufs_get_sb_info(dir->i_sb)->debug) |
295 | ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, | |
296 | mode, ctx); | |
297 | ||
298 | if (ret) | |
299 | goto out_free_ctx; | |
300 | ||
67207b96 AB |
301 | d_instantiate(dentry, inode); |
302 | dget(dentry); | |
ba0b996d JK |
303 | inc_nlink(dir); |
304 | inc_nlink(dentry->d_inode); | |
67207b96 AB |
305 | goto out; |
306 | ||
307 | out_free_ctx: | |
89df0085 | 308 | spu_forget(ctx); |
67207b96 AB |
309 | put_spu_context(ctx); |
310 | out_iput: | |
311 | iput(inode); | |
312 | out: | |
313 | return ret; | |
314 | } | |
315 | ||
346f4d3c AB |
316 | static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) |
317 | { | |
318 | int ret; | |
319 | struct file *filp; | |
320 | ||
321 | ret = get_unused_fd(); | |
322 | if (ret < 0) { | |
323 | dput(dentry); | |
324 | mntput(mnt); | |
325 | goto out; | |
326 | } | |
327 | ||
745ca247 | 328 | filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); |
346f4d3c AB |
329 | if (IS_ERR(filp)) { |
330 | put_unused_fd(ret); | |
331 | ret = PTR_ERR(filp); | |
332 | goto out; | |
333 | } | |
334 | ||
335 | filp->f_op = &spufs_context_fops; | |
336 | fd_install(ret, filp); | |
337 | out: | |
338 | return ret; | |
339 | } | |
340 | ||
8e68e2f2 AB |
341 | static struct spu_context * |
342 | spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, | |
343 | struct file *filp) | |
344 | { | |
58119068 | 345 | struct spu_context *tmp, *neighbor, *err; |
8e68e2f2 AB |
346 | int count, node; |
347 | int aff_supp; | |
348 | ||
349 | aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, | |
350 | struct spu, cbe_list))->aff_list); | |
351 | ||
352 | if (!aff_supp) | |
353 | return ERR_PTR(-EINVAL); | |
354 | ||
355 | if (flags & SPU_CREATE_GANG) | |
356 | return ERR_PTR(-EINVAL); | |
357 | ||
358 | if (flags & SPU_CREATE_AFFINITY_MEM && | |
359 | gang->aff_ref_ctx && | |
360 | gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) | |
361 | return ERR_PTR(-EEXIST); | |
362 | ||
363 | if (gang->aff_flags & AFF_MERGED) | |
364 | return ERR_PTR(-EBUSY); | |
365 | ||
366 | neighbor = NULL; | |
367 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
368 | if (!filp || filp->f_op != &spufs_context_fops) | |
369 | return ERR_PTR(-EINVAL); | |
370 | ||
371 | neighbor = get_spu_context( | |
372 | SPUFS_I(filp->f_dentry->d_inode)->i_ctx); | |
373 | ||
374 | if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && | |
375 | !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && | |
376 | !list_entry(neighbor->aff_list.next, struct spu_context, | |
58119068 AD |
377 | aff_list)->aff_head) { |
378 | err = ERR_PTR(-EEXIST); | |
379 | goto out_put_neighbor; | |
380 | } | |
8e68e2f2 | 381 | |
58119068 AD |
382 | if (gang != neighbor->gang) { |
383 | err = ERR_PTR(-EINVAL); | |
384 | goto out_put_neighbor; | |
385 | } | |
8e68e2f2 AB |
386 | |
387 | count = 1; | |
388 | list_for_each_entry(tmp, &gang->aff_list_head, aff_list) | |
389 | count++; | |
390 | if (list_empty(&neighbor->aff_list)) | |
391 | count++; | |
392 | ||
393 | for (node = 0; node < MAX_NUMNODES; node++) { | |
394 | if ((cbe_spu_info[node].n_spus - atomic_read( | |
395 | &cbe_spu_info[node].reserved_spus)) >= count) | |
396 | break; | |
397 | } | |
398 | ||
58119068 AD |
399 | if (node == MAX_NUMNODES) { |
400 | err = ERR_PTR(-EEXIST); | |
401 | goto out_put_neighbor; | |
402 | } | |
8e68e2f2 AB |
403 | } |
404 | ||
405 | return neighbor; | |
58119068 AD |
406 | |
407 | out_put_neighbor: | |
408 | put_spu_context(neighbor); | |
409 | return err; | |
8e68e2f2 AB |
410 | } |
411 | ||
412 | static void | |
413 | spufs_set_affinity(unsigned int flags, struct spu_context *ctx, | |
414 | struct spu_context *neighbor) | |
415 | { | |
416 | if (flags & SPU_CREATE_AFFINITY_MEM) | |
417 | ctx->gang->aff_ref_ctx = ctx; | |
418 | ||
419 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
420 | if (list_empty(&neighbor->aff_list)) { | |
421 | list_add_tail(&neighbor->aff_list, | |
422 | &ctx->gang->aff_list_head); | |
423 | neighbor->aff_head = 1; | |
424 | } | |
425 | ||
426 | if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) | |
427 | || list_entry(neighbor->aff_list.next, struct spu_context, | |
428 | aff_list)->aff_head) { | |
429 | list_add(&ctx->aff_list, &neighbor->aff_list); | |
430 | } else { | |
431 | list_add_tail(&ctx->aff_list, &neighbor->aff_list); | |
432 | if (neighbor->aff_head) { | |
433 | neighbor->aff_head = 0; | |
434 | ctx->aff_head = 1; | |
435 | } | |
436 | } | |
437 | ||
438 | if (!ctx->gang->aff_ref_ctx) | |
439 | ctx->gang->aff_ref_ctx = ctx; | |
440 | } | |
441 | } | |
442 | ||
443 | static int | |
444 | spufs_create_context(struct inode *inode, struct dentry *dentry, | |
445 | struct vfsmount *mnt, int flags, int mode, | |
446 | struct file *aff_filp) | |
6263203e AB |
447 | { |
448 | int ret; | |
8e68e2f2 AB |
449 | int affinity; |
450 | struct spu_gang *gang; | |
451 | struct spu_context *neighbor; | |
6263203e | 452 | |
5737edd1 MN |
453 | ret = -EPERM; |
454 | if ((flags & SPU_CREATE_NOSCHED) && | |
455 | !capable(CAP_SYS_NICE)) | |
456 | goto out_unlock; | |
457 | ||
458 | ret = -EINVAL; | |
459 | if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) | |
460 | == SPU_CREATE_ISOLATE) | |
461 | goto out_unlock; | |
462 | ||
bd2e5f82 JK |
463 | ret = -ENODEV; |
464 | if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) | |
465 | goto out_unlock; | |
466 | ||
8e68e2f2 AB |
467 | gang = NULL; |
468 | neighbor = NULL; | |
469 | affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); | |
470 | if (affinity) { | |
471 | gang = SPUFS_I(inode)->i_gang; | |
472 | ret = -EINVAL; | |
473 | if (!gang) | |
474 | goto out_unlock; | |
475 | mutex_lock(&gang->aff_mutex); | |
476 | neighbor = spufs_assert_affinity(flags, gang, aff_filp); | |
477 | if (IS_ERR(neighbor)) { | |
478 | ret = PTR_ERR(neighbor); | |
479 | goto out_aff_unlock; | |
480 | } | |
481 | } | |
482 | ||
6263203e AB |
483 | ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); |
484 | if (ret) | |
8e68e2f2 AB |
485 | goto out_aff_unlock; |
486 | ||
58119068 | 487 | if (affinity) { |
8e68e2f2 AB |
488 | spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx, |
489 | neighbor); | |
58119068 AD |
490 | if (neighbor) |
491 | put_spu_context(neighbor); | |
492 | } | |
6263203e AB |
493 | |
494 | /* | |
495 | * get references for dget and mntget, will be released | |
496 | * in error path of *_open(). | |
497 | */ | |
498 | ret = spufs_context_open(dget(dentry), mntget(mnt)); | |
499 | if (ret < 0) { | |
500 | WARN_ON(spufs_rmdir(inode, dentry)); | |
6747c2ee KI |
501 | if (affinity) |
502 | mutex_unlock(&gang->aff_mutex); | |
6263203e AB |
503 | mutex_unlock(&inode->i_mutex); |
504 | spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); | |
505 | goto out; | |
506 | } | |
507 | ||
8e68e2f2 AB |
508 | out_aff_unlock: |
509 | if (affinity) | |
510 | mutex_unlock(&gang->aff_mutex); | |
6263203e AB |
511 | out_unlock: |
512 | mutex_unlock(&inode->i_mutex); | |
513 | out: | |
514 | dput(dentry); | |
515 | return ret; | |
516 | } | |
517 | ||
6263203e AB |
518 | static int |
519 | spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode) | |
520 | { | |
521 | int ret; | |
522 | struct inode *inode; | |
523 | struct spu_gang *gang; | |
524 | ||
525 | ret = -ENOSPC; | |
526 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
527 | if (!inode) | |
528 | goto out; | |
529 | ||
530 | ret = 0; | |
531 | if (dir->i_mode & S_ISGID) { | |
532 | inode->i_gid = dir->i_gid; | |
533 | inode->i_mode &= S_ISGID; | |
534 | } | |
535 | gang = alloc_spu_gang(); | |
536 | SPUFS_I(inode)->i_ctx = NULL; | |
537 | SPUFS_I(inode)->i_gang = gang; | |
538 | if (!gang) | |
539 | goto out_iput; | |
540 | ||
b8c295f9 | 541 | inode->i_op = &simple_dir_inode_operations; |
6263203e AB |
542 | inode->i_fop = &simple_dir_operations; |
543 | ||
544 | d_instantiate(dentry, inode); | |
ba0b996d JK |
545 | inc_nlink(dir); |
546 | inc_nlink(dentry->d_inode); | |
6263203e AB |
547 | return ret; |
548 | ||
549 | out_iput: | |
550 | iput(inode); | |
551 | out: | |
552 | return ret; | |
553 | } | |
554 | ||
555 | static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) | |
556 | { | |
557 | int ret; | |
558 | struct file *filp; | |
559 | ||
560 | ret = get_unused_fd(); | |
561 | if (ret < 0) { | |
562 | dput(dentry); | |
563 | mntput(mnt); | |
564 | goto out; | |
565 | } | |
566 | ||
745ca247 | 567 | filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); |
6263203e AB |
568 | if (IS_ERR(filp)) { |
569 | put_unused_fd(ret); | |
570 | ret = PTR_ERR(filp); | |
571 | goto out; | |
572 | } | |
573 | ||
877907d3 | 574 | filp->f_op = &simple_dir_operations; |
6263203e AB |
575 | fd_install(ret, filp); |
576 | out: | |
577 | return ret; | |
578 | } | |
579 | ||
580 | static int spufs_create_gang(struct inode *inode, | |
581 | struct dentry *dentry, | |
582 | struct vfsmount *mnt, int mode) | |
583 | { | |
584 | int ret; | |
585 | ||
586 | ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); | |
587 | if (ret) | |
588 | goto out; | |
589 | ||
590 | /* | |
591 | * get references for dget and mntget, will be released | |
592 | * in error path of *_open(). | |
593 | */ | |
594 | ret = spufs_gang_open(dget(dentry), mntget(mnt)); | |
877907d3 JK |
595 | if (ret < 0) { |
596 | int err = simple_rmdir(inode, dentry); | |
597 | WARN_ON(err); | |
598 | } | |
6263203e AB |
599 | |
600 | out: | |
601 | mutex_unlock(&inode->i_mutex); | |
602 | dput(dentry); | |
603 | return ret; | |
604 | } | |
605 | ||
606 | ||
346f4d3c AB |
607 | static struct file_system_type spufs_type; |
608 | ||
8e68e2f2 AB |
609 | long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode, |
610 | struct file *filp) | |
67207b96 AB |
611 | { |
612 | struct dentry *dentry; | |
67207b96 AB |
613 | int ret; |
614 | ||
67207b96 | 615 | ret = -EINVAL; |
6263203e | 616 | /* check if we are on spufs */ |
4ac91378 | 617 | if (nd->path.dentry->d_sb->s_type != &spufs_type) |
67207b96 AB |
618 | goto out; |
619 | ||
6263203e | 620 | /* don't accept undefined flags */ |
9add11da | 621 | if (flags & (~SPU_CREATE_FLAG_ALL)) |
c9832948 | 622 | goto out; |
623 | ||
6263203e | 624 | /* only threads can be underneath a gang */ |
4ac91378 | 625 | if (nd->path.dentry != nd->path.dentry->d_sb->s_root) { |
6263203e | 626 | if ((flags & SPU_CREATE_GANG) || |
4ac91378 | 627 | !SPUFS_I(nd->path.dentry->d_inode)->i_gang) |
6263203e AB |
628 | goto out; |
629 | } | |
630 | ||
67207b96 AB |
631 | dentry = lookup_create(nd, 1); |
632 | ret = PTR_ERR(dentry); | |
633 | if (IS_ERR(dentry)) | |
634 | goto out_dir; | |
635 | ||
ce3b0f8d | 636 | mode &= ~current_umask(); |
67207b96 | 637 | |
6263203e | 638 | if (flags & SPU_CREATE_GANG) |
826be063 | 639 | ret = spufs_create_gang(nd->path.dentry->d_inode, |
4ac91378 | 640 | dentry, nd->path.mnt, mode); |
6263203e | 641 | else |
826be063 | 642 | ret = spufs_create_context(nd->path.dentry->d_inode, |
4ac91378 JB |
643 | dentry, nd->path.mnt, flags, mode, |
644 | filp); | |
826be063 CH |
645 | if (ret >= 0) |
646 | fsnotify_mkdir(nd->path.dentry->d_inode, dentry); | |
647 | return ret; | |
67207b96 | 648 | |
67207b96 | 649 | out_dir: |
4ac91378 | 650 | mutex_unlock(&nd->path.dentry->d_inode->i_mutex); |
67207b96 AB |
651 | out: |
652 | return ret; | |
653 | } | |
654 | ||
655 | /* File system initialization */ | |
656 | enum { | |
2c3e4787 | 657 | Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err, |
67207b96 AB |
658 | }; |
659 | ||
a447c093 | 660 | static const match_table_t spufs_tokens = { |
2c3e4787 JK |
661 | { Opt_uid, "uid=%d" }, |
662 | { Opt_gid, "gid=%d" }, | |
663 | { Opt_mode, "mode=%o" }, | |
664 | { Opt_debug, "debug" }, | |
665 | { Opt_err, NULL }, | |
67207b96 AB |
666 | }; |
667 | ||
668 | static int | |
2c3e4787 | 669 | spufs_parse_options(struct super_block *sb, char *options, struct inode *root) |
67207b96 AB |
670 | { |
671 | char *p; | |
672 | substring_t args[MAX_OPT_ARGS]; | |
673 | ||
674 | while ((p = strsep(&options, ",")) != NULL) { | |
675 | int token, option; | |
676 | ||
677 | if (!*p) | |
678 | continue; | |
679 | ||
680 | token = match_token(p, spufs_tokens, args); | |
681 | switch (token) { | |
682 | case Opt_uid: | |
683 | if (match_int(&args[0], &option)) | |
684 | return 0; | |
685 | root->i_uid = option; | |
686 | break; | |
687 | case Opt_gid: | |
688 | if (match_int(&args[0], &option)) | |
689 | return 0; | |
690 | root->i_gid = option; | |
691 | break; | |
f11f5ee7 JK |
692 | case Opt_mode: |
693 | if (match_octal(&args[0], &option)) | |
694 | return 0; | |
695 | root->i_mode = option | S_IFDIR; | |
696 | break; | |
2c3e4787 JK |
697 | case Opt_debug: |
698 | spufs_get_sb_info(sb)->debug = 1; | |
699 | break; | |
67207b96 AB |
700 | default: |
701 | return 0; | |
702 | } | |
703 | } | |
704 | return 1; | |
705 | } | |
706 | ||
db1384b4 AM |
707 | static void spufs_exit_isolated_loader(void) |
708 | { | |
8b0d3121 SS |
709 | free_pages((unsigned long) isolated_loader, |
710 | get_order(isolated_loader_size)); | |
db1384b4 AM |
711 | } |
712 | ||
0afacde3 | 713 | static void |
714 | spufs_init_isolated_loader(void) | |
715 | { | |
716 | struct device_node *dn; | |
717 | const char *loader; | |
718 | int size; | |
719 | ||
720 | dn = of_find_node_by_path("/spu-isolation"); | |
721 | if (!dn) | |
722 | return; | |
723 | ||
e2eb6392 | 724 | loader = of_get_property(dn, "loader", &size); |
0afacde3 | 725 | if (!loader) |
726 | return; | |
727 | ||
8b0d3121 SS |
728 | /* the loader must be align on a 16 byte boundary */ |
729 | isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size)); | |
0afacde3 | 730 | if (!isolated_loader) |
731 | return; | |
732 | ||
8b0d3121 | 733 | isolated_loader_size = size; |
0afacde3 | 734 | memcpy(isolated_loader, loader, size); |
735 | printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); | |
736 | } | |
737 | ||
67207b96 | 738 | static int |
8b3d6663 AB |
739 | spufs_create_root(struct super_block *sb, void *data) |
740 | { | |
67207b96 AB |
741 | struct inode *inode; |
742 | int ret; | |
743 | ||
8f18a158 AB |
744 | ret = -ENODEV; |
745 | if (!spu_management_ops) | |
746 | goto out; | |
747 | ||
67207b96 AB |
748 | ret = -ENOMEM; |
749 | inode = spufs_new_inode(sb, S_IFDIR | 0775); | |
750 | if (!inode) | |
751 | goto out; | |
752 | ||
b8c295f9 | 753 | inode->i_op = &simple_dir_inode_operations; |
67207b96 AB |
754 | inode->i_fop = &simple_dir_operations; |
755 | SPUFS_I(inode)->i_ctx = NULL; | |
e2ed6e4d | 756 | inc_nlink(inode); |
67207b96 AB |
757 | |
758 | ret = -EINVAL; | |
2c3e4787 | 759 | if (!spufs_parse_options(sb, data, inode)) |
67207b96 AB |
760 | goto out_iput; |
761 | ||
762 | ret = -ENOMEM; | |
763 | sb->s_root = d_alloc_root(inode); | |
764 | if (!sb->s_root) | |
765 | goto out_iput; | |
766 | ||
767 | return 0; | |
768 | out_iput: | |
769 | iput(inode); | |
770 | out: | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static int | |
775 | spufs_fill_super(struct super_block *sb, void *data, int silent) | |
776 | { | |
2c3e4787 | 777 | struct spufs_sb_info *info; |
b87221de | 778 | static const struct super_operations s_ops = { |
67207b96 AB |
779 | .alloc_inode = spufs_alloc_inode, |
780 | .destroy_inode = spufs_destroy_inode, | |
781 | .statfs = simple_statfs, | |
782 | .delete_inode = spufs_delete_inode, | |
783 | .drop_inode = generic_delete_inode, | |
90d09e14 | 784 | .show_options = generic_show_options, |
67207b96 AB |
785 | }; |
786 | ||
90d09e14 MS |
787 | save_mount_options(sb, data); |
788 | ||
2c3e4787 JK |
789 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
790 | if (!info) | |
791 | return -ENOMEM; | |
792 | ||
67207b96 AB |
793 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
794 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
795 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
796 | sb->s_magic = SPUFS_MAGIC; | |
797 | sb->s_op = &s_ops; | |
2c3e4787 | 798 | sb->s_fs_info = info; |
67207b96 AB |
799 | |
800 | return spufs_create_root(sb, data); | |
801 | } | |
802 | ||
454e2398 | 803 | static int |
67207b96 | 804 | spufs_get_sb(struct file_system_type *fstype, int flags, |
454e2398 | 805 | const char *name, void *data, struct vfsmount *mnt) |
67207b96 | 806 | { |
454e2398 | 807 | return get_sb_single(fstype, flags, data, spufs_fill_super, mnt); |
67207b96 AB |
808 | } |
809 | ||
810 | static struct file_system_type spufs_type = { | |
811 | .owner = THIS_MODULE, | |
812 | .name = "spufs", | |
813 | .get_sb = spufs_get_sb, | |
814 | .kill_sb = kill_litter_super, | |
815 | }; | |
816 | ||
e78b47a5 | 817 | static int __init spufs_init(void) |
67207b96 AB |
818 | { |
819 | int ret; | |
bf1ab978 | 820 | |
ccf17e9d JK |
821 | ret = -ENODEV; |
822 | if (!spu_management_ops) | |
823 | goto out; | |
824 | ||
67207b96 AB |
825 | ret = -ENOMEM; |
826 | spufs_inode_cache = kmem_cache_create("spufs_inode_cache", | |
827 | sizeof(struct spufs_inode_info), 0, | |
20c2df83 | 828 | SLAB_HWCACHE_ALIGN, spufs_init_once); |
67207b96 AB |
829 | |
830 | if (!spufs_inode_cache) | |
831 | goto out; | |
c99c1994 | 832 | ret = spu_sched_init(); |
67207b96 AB |
833 | if (ret) |
834 | goto out_cache; | |
c99c1994 AM |
835 | ret = register_filesystem(&spufs_type); |
836 | if (ret) | |
837 | goto out_sched; | |
67207b96 | 838 | ret = register_spu_syscalls(&spufs_calls); |
bf1ab978 DGM |
839 | if (ret) |
840 | goto out_fs; | |
0afacde3 | 841 | |
842 | spufs_init_isolated_loader(); | |
bf1ab978 | 843 | |
67207b96 | 844 | return 0; |
c99c1994 | 845 | |
67207b96 AB |
846 | out_fs: |
847 | unregister_filesystem(&spufs_type); | |
c99c1994 AM |
848 | out_sched: |
849 | spu_sched_exit(); | |
67207b96 AB |
850 | out_cache: |
851 | kmem_cache_destroy(spufs_inode_cache); | |
852 | out: | |
853 | return ret; | |
854 | } | |
855 | module_init(spufs_init); | |
856 | ||
e78b47a5 | 857 | static void __exit spufs_exit(void) |
67207b96 | 858 | { |
8b3d6663 | 859 | spu_sched_exit(); |
db1384b4 | 860 | spufs_exit_isolated_loader(); |
67207b96 AB |
861 | unregister_spu_syscalls(&spufs_calls); |
862 | unregister_filesystem(&spufs_type); | |
863 | kmem_cache_destroy(spufs_inode_cache); | |
864 | } | |
865 | module_exit(spufs_exit); | |
866 | ||
867 | MODULE_LICENSE("GPL"); | |
868 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); | |
869 |