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Commit | Line | Data |
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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 | ||
fa0d7e3d | 74 | static void spufs_i_callback(struct rcu_head *head) |
67207b96 | 75 | { |
fa0d7e3d | 76 | struct inode *inode = container_of(head, struct inode, i_rcu); |
67207b96 AB |
77 | kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); |
78 | } | |
79 | ||
fa0d7e3d NP |
80 | static void spufs_destroy_inode(struct inode *inode) |
81 | { | |
82 | call_rcu(&inode->i_rcu, spufs_i_callback); | |
83 | } | |
84 | ||
67207b96 | 85 | static void |
51cc5068 | 86 | spufs_init_once(void *p) |
67207b96 AB |
87 | { |
88 | struct spufs_inode_info *ei = p; | |
89 | ||
a35afb83 | 90 | inode_init_once(&ei->vfs_inode); |
67207b96 AB |
91 | } |
92 | ||
93 | static struct inode * | |
c6684b26 | 94 | spufs_new_inode(struct super_block *sb, umode_t mode) |
67207b96 AB |
95 | { |
96 | struct inode *inode; | |
97 | ||
98 | inode = new_inode(sb); | |
99 | if (!inode) | |
100 | goto out; | |
101 | ||
102 | inode->i_mode = mode; | |
1330deb0 DH |
103 | inode->i_uid = current_fsuid(); |
104 | inode->i_gid = current_fsgid(); | |
67207b96 AB |
105 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
106 | out: | |
107 | return inode; | |
108 | } | |
109 | ||
110 | static int | |
111 | spufs_setattr(struct dentry *dentry, struct iattr *attr) | |
112 | { | |
113 | struct inode *inode = dentry->d_inode; | |
114 | ||
67207b96 AB |
115 | if ((attr->ia_valid & ATTR_SIZE) && |
116 | (attr->ia_size != inode->i_size)) | |
117 | return -EINVAL; | |
1025774c CH |
118 | setattr_copy(inode, attr); |
119 | mark_inode_dirty(inode); | |
120 | return 0; | |
67207b96 AB |
121 | } |
122 | ||
123 | ||
124 | static int | |
125 | spufs_new_file(struct super_block *sb, struct dentry *dentry, | |
c6684b26 | 126 | const struct file_operations *fops, umode_t mode, |
23d893f5 | 127 | size_t size, struct spu_context *ctx) |
67207b96 | 128 | { |
6e1d5dcc | 129 | static const struct inode_operations spufs_file_iops = { |
67207b96 | 130 | .setattr = spufs_setattr, |
67207b96 AB |
131 | }; |
132 | struct inode *inode; | |
133 | int ret; | |
134 | ||
135 | ret = -ENOSPC; | |
136 | inode = spufs_new_inode(sb, S_IFREG | mode); | |
137 | if (!inode) | |
138 | goto out; | |
139 | ||
140 | ret = 0; | |
141 | inode->i_op = &spufs_file_iops; | |
142 | inode->i_fop = fops; | |
23d893f5 | 143 | inode->i_size = size; |
8e18e294 | 144 | inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); |
67207b96 AB |
145 | d_add(dentry, inode); |
146 | out: | |
147 | return ret; | |
148 | } | |
149 | ||
150 | static void | |
0f3f63a4 | 151 | spufs_evict_inode(struct inode *inode) |
67207b96 | 152 | { |
6263203e | 153 | struct spufs_inode_info *ei = SPUFS_I(inode); |
dbd5768f | 154 | clear_inode(inode); |
6263203e AB |
155 | if (ei->i_ctx) |
156 | put_spu_context(ei->i_ctx); | |
157 | if (ei->i_gang) | |
158 | put_spu_gang(ei->i_gang); | |
67207b96 AB |
159 | } |
160 | ||
3f51dd91 | 161 | static void spufs_prune_dir(struct dentry *dir) |
67207b96 | 162 | { |
8b3d6663 | 163 | struct dentry *dentry, *tmp; |
6263203e | 164 | |
1b1dcc1b | 165 | mutex_lock(&dir->d_inode->i_mutex); |
c3a9aea7 | 166 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { |
67207b96 | 167 | spin_lock(&dentry->d_lock); |
8b3d6663 | 168 | if (!(d_unhashed(dentry)) && dentry->d_inode) { |
dc0474be | 169 | dget_dlock(dentry); |
8b3d6663 AB |
170 | __d_drop(dentry); |
171 | spin_unlock(&dentry->d_lock); | |
3f51dd91 | 172 | simple_unlink(dir->d_inode, dentry); |
b5c84bf6 | 173 | /* XXX: what was dcache_lock protecting here? Other |
da502956 NP |
174 | * filesystems (IB, configfs) release dcache_lock |
175 | * before unlink */ | |
8b3d6663 AB |
176 | dput(dentry); |
177 | } else { | |
178 | spin_unlock(&dentry->d_lock); | |
8b3d6663 | 179 | } |
67207b96 | 180 | } |
3f51dd91 | 181 | shrink_dcache_parent(dir); |
1b1dcc1b | 182 | mutex_unlock(&dir->d_inode->i_mutex); |
3f51dd91 AB |
183 | } |
184 | ||
6263203e AB |
185 | /* Caller must hold parent->i_mutex */ |
186 | static int spufs_rmdir(struct inode *parent, struct dentry *dir) | |
3f51dd91 | 187 | { |
3f51dd91 | 188 | /* remove all entries */ |
67cba9fd | 189 | int res; |
6263203e | 190 | spufs_prune_dir(dir); |
c443acab | 191 | d_drop(dir); |
67cba9fd AV |
192 | res = simple_rmdir(parent, dir); |
193 | /* We have to give up the mm_struct */ | |
194 | spu_forget(SPUFS_I(dir->d_inode)->i_ctx); | |
195 | return res; | |
67207b96 AB |
196 | } |
197 | ||
74254647 | 198 | static int spufs_fill_dir(struct dentry *dir, |
c6684b26 | 199 | const struct spufs_tree_descr *files, umode_t mode, |
74254647 | 200 | struct spu_context *ctx) |
3f51dd91 | 201 | { |
87873c86 | 202 | struct dentry *dentry, *tmp; |
3f51dd91 AB |
203 | int ret; |
204 | ||
205 | while (files->name && files->name[0]) { | |
206 | ret = -ENOMEM; | |
207 | dentry = d_alloc_name(dir, files->name); | |
208 | if (!dentry) | |
209 | goto out; | |
210 | ret = spufs_new_file(dir->d_sb, dentry, files->ops, | |
23d893f5 | 211 | files->mode & mode, files->size, ctx); |
3f51dd91 AB |
212 | if (ret) |
213 | goto out; | |
214 | files++; | |
215 | } | |
216 | return 0; | |
217 | out: | |
87873c86 SS |
218 | /* |
219 | * remove all children from dir. dir->inode is not set so don't | |
220 | * just simply use spufs_prune_dir() and panic afterwards :) | |
221 | * dput() looks like it will do the right thing: | |
222 | * - dec parent's ref counter | |
223 | * - remove child from parent's child list | |
224 | * - free child's inode if possible | |
225 | * - free child | |
226 | */ | |
227 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { | |
228 | dput(dentry); | |
229 | } | |
230 | ||
231 | shrink_dcache_parent(dir); | |
3f51dd91 AB |
232 | return ret; |
233 | } | |
234 | ||
67207b96 AB |
235 | static int spufs_dir_close(struct inode *inode, struct file *file) |
236 | { | |
0309f02d | 237 | struct spu_context *ctx; |
6263203e AB |
238 | struct inode *parent; |
239 | struct dentry *dir; | |
67207b96 AB |
240 | int ret; |
241 | ||
b4d1ab58 | 242 | dir = file->f_path.dentry; |
6263203e AB |
243 | parent = dir->d_parent->d_inode; |
244 | ctx = SPUFS_I(dir->d_inode)->i_ctx; | |
c8ca0633 | 245 | |
02539d71 | 246 | mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT); |
6263203e AB |
247 | ret = spufs_rmdir(parent, dir); |
248 | mutex_unlock(&parent->i_mutex); | |
67207b96 | 249 | WARN_ON(ret); |
c8ca0633 | 250 | |
67207b96 AB |
251 | return dcache_dir_close(inode, file); |
252 | } | |
253 | ||
5dfe4c96 | 254 | const struct file_operations spufs_context_fops = { |
67207b96 AB |
255 | .open = dcache_dir_open, |
256 | .release = spufs_dir_close, | |
257 | .llseek = dcache_dir_lseek, | |
258 | .read = generic_read_dir, | |
259 | .readdir = dcache_readdir, | |
1b061d92 | 260 | .fsync = noop_fsync, |
67207b96 | 261 | }; |
bf1ab978 | 262 | EXPORT_SYMBOL_GPL(spufs_context_fops); |
67207b96 AB |
263 | |
264 | static int | |
9add11da | 265 | spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, |
c6684b26 | 266 | umode_t mode) |
67207b96 AB |
267 | { |
268 | int ret; | |
269 | struct inode *inode; | |
270 | struct spu_context *ctx; | |
271 | ||
272 | ret = -ENOSPC; | |
273 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
274 | if (!inode) | |
275 | goto out; | |
276 | ||
277 | if (dir->i_mode & S_ISGID) { | |
278 | inode->i_gid = dir->i_gid; | |
279 | inode->i_mode &= S_ISGID; | |
280 | } | |
6263203e | 281 | ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ |
67207b96 AB |
282 | SPUFS_I(inode)->i_ctx = ctx; |
283 | if (!ctx) | |
284 | goto out_iput; | |
285 | ||
9add11da | 286 | ctx->flags = flags; |
b8c295f9 | 287 | inode->i_op = &simple_dir_inode_operations; |
67207b96 | 288 | inode->i_fop = &simple_dir_operations; |
5737edd1 MN |
289 | if (flags & SPU_CREATE_NOSCHED) |
290 | ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, | |
291 | mode, ctx); | |
292 | else | |
293 | ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); | |
294 | ||
67207b96 AB |
295 | if (ret) |
296 | goto out_free_ctx; | |
297 | ||
2c3e4787 JK |
298 | if (spufs_get_sb_info(dir->i_sb)->debug) |
299 | ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, | |
300 | mode, ctx); | |
301 | ||
302 | if (ret) | |
303 | goto out_free_ctx; | |
304 | ||
67207b96 AB |
305 | d_instantiate(dentry, inode); |
306 | dget(dentry); | |
ba0b996d JK |
307 | inc_nlink(dir); |
308 | inc_nlink(dentry->d_inode); | |
67207b96 AB |
309 | goto out; |
310 | ||
311 | out_free_ctx: | |
89df0085 | 312 | spu_forget(ctx); |
67207b96 AB |
313 | put_spu_context(ctx); |
314 | out_iput: | |
315 | iput(inode); | |
316 | out: | |
317 | return ret; | |
318 | } | |
319 | ||
765927b2 | 320 | static int spufs_context_open(struct path *path) |
346f4d3c AB |
321 | { |
322 | int ret; | |
323 | struct file *filp; | |
324 | ||
325 | ret = get_unused_fd(); | |
bf349a44 AV |
326 | if (ret < 0) |
327 | return ret; | |
346f4d3c | 328 | |
765927b2 | 329 | filp = dentry_open(path, O_RDONLY, current_cred()); |
346f4d3c AB |
330 | if (IS_ERR(filp)) { |
331 | put_unused_fd(ret); | |
bf349a44 | 332 | return PTR_ERR(filp); |
346f4d3c AB |
333 | } |
334 | ||
335 | filp->f_op = &spufs_context_fops; | |
336 | fd_install(ret, filp); | |
346f4d3c AB |
337 | return ret; |
338 | } | |
339 | ||
8e68e2f2 AB |
340 | static struct spu_context * |
341 | spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, | |
342 | struct file *filp) | |
343 | { | |
58119068 | 344 | struct spu_context *tmp, *neighbor, *err; |
8e68e2f2 AB |
345 | int count, node; |
346 | int aff_supp; | |
347 | ||
348 | aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, | |
349 | struct spu, cbe_list))->aff_list); | |
350 | ||
351 | if (!aff_supp) | |
352 | return ERR_PTR(-EINVAL); | |
353 | ||
354 | if (flags & SPU_CREATE_GANG) | |
355 | return ERR_PTR(-EINVAL); | |
356 | ||
357 | if (flags & SPU_CREATE_AFFINITY_MEM && | |
358 | gang->aff_ref_ctx && | |
359 | gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) | |
360 | return ERR_PTR(-EEXIST); | |
361 | ||
362 | if (gang->aff_flags & AFF_MERGED) | |
363 | return ERR_PTR(-EBUSY); | |
364 | ||
365 | neighbor = NULL; | |
366 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
367 | if (!filp || filp->f_op != &spufs_context_fops) | |
368 | return ERR_PTR(-EINVAL); | |
369 | ||
370 | neighbor = get_spu_context( | |
371 | SPUFS_I(filp->f_dentry->d_inode)->i_ctx); | |
372 | ||
373 | if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && | |
374 | !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && | |
375 | !list_entry(neighbor->aff_list.next, struct spu_context, | |
58119068 AD |
376 | aff_list)->aff_head) { |
377 | err = ERR_PTR(-EEXIST); | |
378 | goto out_put_neighbor; | |
379 | } | |
8e68e2f2 | 380 | |
58119068 AD |
381 | if (gang != neighbor->gang) { |
382 | err = ERR_PTR(-EINVAL); | |
383 | goto out_put_neighbor; | |
384 | } | |
8e68e2f2 AB |
385 | |
386 | count = 1; | |
387 | list_for_each_entry(tmp, &gang->aff_list_head, aff_list) | |
388 | count++; | |
389 | if (list_empty(&neighbor->aff_list)) | |
390 | count++; | |
391 | ||
392 | for (node = 0; node < MAX_NUMNODES; node++) { | |
393 | if ((cbe_spu_info[node].n_spus - atomic_read( | |
394 | &cbe_spu_info[node].reserved_spus)) >= count) | |
395 | break; | |
396 | } | |
397 | ||
58119068 AD |
398 | if (node == MAX_NUMNODES) { |
399 | err = ERR_PTR(-EEXIST); | |
400 | goto out_put_neighbor; | |
401 | } | |
8e68e2f2 AB |
402 | } |
403 | ||
404 | return neighbor; | |
58119068 AD |
405 | |
406 | out_put_neighbor: | |
407 | put_spu_context(neighbor); | |
408 | return err; | |
8e68e2f2 AB |
409 | } |
410 | ||
411 | static void | |
412 | spufs_set_affinity(unsigned int flags, struct spu_context *ctx, | |
413 | struct spu_context *neighbor) | |
414 | { | |
415 | if (flags & SPU_CREATE_AFFINITY_MEM) | |
416 | ctx->gang->aff_ref_ctx = ctx; | |
417 | ||
418 | if (flags & SPU_CREATE_AFFINITY_SPU) { | |
419 | if (list_empty(&neighbor->aff_list)) { | |
420 | list_add_tail(&neighbor->aff_list, | |
421 | &ctx->gang->aff_list_head); | |
422 | neighbor->aff_head = 1; | |
423 | } | |
424 | ||
425 | if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) | |
426 | || list_entry(neighbor->aff_list.next, struct spu_context, | |
427 | aff_list)->aff_head) { | |
428 | list_add(&ctx->aff_list, &neighbor->aff_list); | |
429 | } else { | |
430 | list_add_tail(&ctx->aff_list, &neighbor->aff_list); | |
431 | if (neighbor->aff_head) { | |
432 | neighbor->aff_head = 0; | |
433 | ctx->aff_head = 1; | |
434 | } | |
435 | } | |
436 | ||
437 | if (!ctx->gang->aff_ref_ctx) | |
438 | ctx->gang->aff_ref_ctx = ctx; | |
439 | } | |
440 | } | |
441 | ||
442 | static int | |
443 | spufs_create_context(struct inode *inode, struct dentry *dentry, | |
c6684b26 | 444 | struct vfsmount *mnt, int flags, umode_t mode, |
8e68e2f2 | 445 | struct file *aff_filp) |
6263203e AB |
446 | { |
447 | int ret; | |
8e68e2f2 AB |
448 | int affinity; |
449 | struct spu_gang *gang; | |
450 | struct spu_context *neighbor; | |
765927b2 | 451 | struct path path = {.mnt = mnt, .dentry = dentry}; |
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 | 493 | |
765927b2 | 494 | ret = spufs_context_open(&path); |
6263203e AB |
495 | if (ret < 0) { |
496 | WARN_ON(spufs_rmdir(inode, dentry)); | |
6747c2ee KI |
497 | if (affinity) |
498 | mutex_unlock(&gang->aff_mutex); | |
6263203e | 499 | mutex_unlock(&inode->i_mutex); |
6263203e AB |
500 | goto out; |
501 | } | |
502 | ||
8e68e2f2 AB |
503 | out_aff_unlock: |
504 | if (affinity) | |
505 | mutex_unlock(&gang->aff_mutex); | |
6263203e AB |
506 | out_unlock: |
507 | mutex_unlock(&inode->i_mutex); | |
508 | out: | |
509 | dput(dentry); | |
510 | return ret; | |
511 | } | |
512 | ||
6263203e | 513 | static int |
c6684b26 | 514 | spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode) |
6263203e AB |
515 | { |
516 | int ret; | |
517 | struct inode *inode; | |
518 | struct spu_gang *gang; | |
519 | ||
520 | ret = -ENOSPC; | |
521 | inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); | |
522 | if (!inode) | |
523 | goto out; | |
524 | ||
525 | ret = 0; | |
526 | if (dir->i_mode & S_ISGID) { | |
527 | inode->i_gid = dir->i_gid; | |
528 | inode->i_mode &= S_ISGID; | |
529 | } | |
530 | gang = alloc_spu_gang(); | |
531 | SPUFS_I(inode)->i_ctx = NULL; | |
532 | SPUFS_I(inode)->i_gang = gang; | |
533 | if (!gang) | |
534 | goto out_iput; | |
535 | ||
b8c295f9 | 536 | inode->i_op = &simple_dir_inode_operations; |
6263203e AB |
537 | inode->i_fop = &simple_dir_operations; |
538 | ||
539 | d_instantiate(dentry, inode); | |
ba0b996d JK |
540 | inc_nlink(dir); |
541 | inc_nlink(dentry->d_inode); | |
6263203e AB |
542 | return ret; |
543 | ||
544 | out_iput: | |
545 | iput(inode); | |
546 | out: | |
547 | return ret; | |
548 | } | |
549 | ||
765927b2 | 550 | static int spufs_gang_open(struct path *path) |
6263203e AB |
551 | { |
552 | int ret; | |
553 | struct file *filp; | |
554 | ||
555 | ret = get_unused_fd(); | |
bf349a44 AV |
556 | if (ret < 0) |
557 | return ret; | |
6263203e | 558 | |
bf349a44 AV |
559 | /* |
560 | * get references for dget and mntget, will be released | |
561 | * in error path of *_open(). | |
562 | */ | |
765927b2 | 563 | filp = dentry_open(path, O_RDONLY, current_cred()); |
6263203e AB |
564 | if (IS_ERR(filp)) { |
565 | put_unused_fd(ret); | |
bf349a44 | 566 | return PTR_ERR(filp); |
6263203e AB |
567 | } |
568 | ||
877907d3 | 569 | filp->f_op = &simple_dir_operations; |
6263203e | 570 | fd_install(ret, filp); |
6263203e AB |
571 | return ret; |
572 | } | |
573 | ||
574 | static int spufs_create_gang(struct inode *inode, | |
575 | struct dentry *dentry, | |
c6684b26 | 576 | struct vfsmount *mnt, umode_t mode) |
6263203e | 577 | { |
765927b2 | 578 | struct path path = {.mnt = mnt, .dentry = dentry}; |
6263203e AB |
579 | int ret; |
580 | ||
581 | ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); | |
582 | if (ret) | |
583 | goto out; | |
584 | ||
765927b2 | 585 | ret = spufs_gang_open(&path); |
877907d3 JK |
586 | if (ret < 0) { |
587 | int err = simple_rmdir(inode, dentry); | |
588 | WARN_ON(err); | |
589 | } | |
6263203e AB |
590 | |
591 | out: | |
592 | mutex_unlock(&inode->i_mutex); | |
593 | dput(dentry); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | ||
346f4d3c AB |
598 | static struct file_system_type spufs_type; |
599 | ||
1ba10681 | 600 | long spufs_create(struct path *path, struct dentry *dentry, |
c6684b26 | 601 | unsigned int flags, umode_t mode, struct file *filp) |
67207b96 | 602 | { |
67207b96 AB |
603 | int ret; |
604 | ||
67207b96 | 605 | ret = -EINVAL; |
6263203e | 606 | /* check if we are on spufs */ |
1ba10681 | 607 | if (path->dentry->d_sb->s_type != &spufs_type) |
67207b96 AB |
608 | goto out; |
609 | ||
6263203e | 610 | /* don't accept undefined flags */ |
9add11da | 611 | if (flags & (~SPU_CREATE_FLAG_ALL)) |
c9832948 AB |
612 | goto out; |
613 | ||
6263203e | 614 | /* only threads can be underneath a gang */ |
1ba10681 | 615 | if (path->dentry != path->dentry->d_sb->s_root) { |
6263203e | 616 | if ((flags & SPU_CREATE_GANG) || |
1ba10681 | 617 | !SPUFS_I(path->dentry->d_inode)->i_gang) |
6263203e AB |
618 | goto out; |
619 | } | |
620 | ||
ce3b0f8d | 621 | mode &= ~current_umask(); |
67207b96 | 622 | |
6263203e | 623 | if (flags & SPU_CREATE_GANG) |
1ba10681 AV |
624 | ret = spufs_create_gang(path->dentry->d_inode, |
625 | dentry, path->mnt, mode); | |
6263203e | 626 | else |
1ba10681 AV |
627 | ret = spufs_create_context(path->dentry->d_inode, |
628 | dentry, path->mnt, flags, mode, | |
4ac91378 | 629 | filp); |
826be063 | 630 | if (ret >= 0) |
1ba10681 | 631 | fsnotify_mkdir(path->dentry->d_inode, dentry); |
826be063 | 632 | return ret; |
67207b96 | 633 | |
67207b96 | 634 | out: |
1ba10681 | 635 | mutex_unlock(&path->dentry->d_inode->i_mutex); |
fb700d36 | 636 | dput(dentry); |
67207b96 AB |
637 | return ret; |
638 | } | |
639 | ||
640 | /* File system initialization */ | |
641 | enum { | |
2c3e4787 | 642 | Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err, |
67207b96 AB |
643 | }; |
644 | ||
a447c093 | 645 | static const match_table_t spufs_tokens = { |
2c3e4787 JK |
646 | { Opt_uid, "uid=%d" }, |
647 | { Opt_gid, "gid=%d" }, | |
648 | { Opt_mode, "mode=%o" }, | |
649 | { Opt_debug, "debug" }, | |
650 | { Opt_err, NULL }, | |
67207b96 AB |
651 | }; |
652 | ||
653 | static int | |
2c3e4787 | 654 | spufs_parse_options(struct super_block *sb, char *options, struct inode *root) |
67207b96 AB |
655 | { |
656 | char *p; | |
657 | substring_t args[MAX_OPT_ARGS]; | |
658 | ||
659 | while ((p = strsep(&options, ",")) != NULL) { | |
660 | int token, option; | |
661 | ||
662 | if (!*p) | |
663 | continue; | |
664 | ||
665 | token = match_token(p, spufs_tokens, args); | |
666 | switch (token) { | |
667 | case Opt_uid: | |
668 | if (match_int(&args[0], &option)) | |
669 | return 0; | |
670 | root->i_uid = option; | |
671 | break; | |
672 | case Opt_gid: | |
673 | if (match_int(&args[0], &option)) | |
674 | return 0; | |
675 | root->i_gid = option; | |
676 | break; | |
f11f5ee7 JK |
677 | case Opt_mode: |
678 | if (match_octal(&args[0], &option)) | |
679 | return 0; | |
680 | root->i_mode = option | S_IFDIR; | |
681 | break; | |
2c3e4787 JK |
682 | case Opt_debug: |
683 | spufs_get_sb_info(sb)->debug = 1; | |
684 | break; | |
67207b96 AB |
685 | default: |
686 | return 0; | |
687 | } | |
688 | } | |
689 | return 1; | |
690 | } | |
691 | ||
db1384b4 AM |
692 | static void spufs_exit_isolated_loader(void) |
693 | { | |
8b0d3121 SS |
694 | free_pages((unsigned long) isolated_loader, |
695 | get_order(isolated_loader_size)); | |
db1384b4 AM |
696 | } |
697 | ||
0afacde3 AB |
698 | static void |
699 | spufs_init_isolated_loader(void) | |
700 | { | |
701 | struct device_node *dn; | |
702 | const char *loader; | |
703 | int size; | |
704 | ||
705 | dn = of_find_node_by_path("/spu-isolation"); | |
706 | if (!dn) | |
707 | return; | |
708 | ||
e2eb6392 | 709 | loader = of_get_property(dn, "loader", &size); |
0afacde3 AB |
710 | if (!loader) |
711 | return; | |
712 | ||
8b0d3121 SS |
713 | /* the loader must be align on a 16 byte boundary */ |
714 | isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size)); | |
0afacde3 AB |
715 | if (!isolated_loader) |
716 | return; | |
717 | ||
8b0d3121 | 718 | isolated_loader_size = size; |
0afacde3 AB |
719 | memcpy(isolated_loader, loader, size); |
720 | printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); | |
721 | } | |
722 | ||
67207b96 | 723 | static int |
8b3d6663 AB |
724 | spufs_create_root(struct super_block *sb, void *data) |
725 | { | |
67207b96 AB |
726 | struct inode *inode; |
727 | int ret; | |
728 | ||
8f18a158 AB |
729 | ret = -ENODEV; |
730 | if (!spu_management_ops) | |
731 | goto out; | |
732 | ||
67207b96 AB |
733 | ret = -ENOMEM; |
734 | inode = spufs_new_inode(sb, S_IFDIR | 0775); | |
735 | if (!inode) | |
736 | goto out; | |
737 | ||
b8c295f9 | 738 | inode->i_op = &simple_dir_inode_operations; |
67207b96 AB |
739 | inode->i_fop = &simple_dir_operations; |
740 | SPUFS_I(inode)->i_ctx = NULL; | |
e2ed6e4d | 741 | inc_nlink(inode); |
67207b96 AB |
742 | |
743 | ret = -EINVAL; | |
2c3e4787 | 744 | if (!spufs_parse_options(sb, data, inode)) |
67207b96 AB |
745 | goto out_iput; |
746 | ||
747 | ret = -ENOMEM; | |
48fde701 | 748 | sb->s_root = d_make_root(inode); |
67207b96 | 749 | if (!sb->s_root) |
48fde701 | 750 | goto out; |
67207b96 AB |
751 | |
752 | return 0; | |
753 | out_iput: | |
754 | iput(inode); | |
755 | out: | |
756 | return ret; | |
757 | } | |
758 | ||
759 | static int | |
760 | spufs_fill_super(struct super_block *sb, void *data, int silent) | |
761 | { | |
2c3e4787 | 762 | struct spufs_sb_info *info; |
b87221de | 763 | static const struct super_operations s_ops = { |
67207b96 AB |
764 | .alloc_inode = spufs_alloc_inode, |
765 | .destroy_inode = spufs_destroy_inode, | |
766 | .statfs = simple_statfs, | |
0f3f63a4 | 767 | .evict_inode = spufs_evict_inode, |
90d09e14 | 768 | .show_options = generic_show_options, |
67207b96 AB |
769 | }; |
770 | ||
90d09e14 MS |
771 | save_mount_options(sb, data); |
772 | ||
2c3e4787 JK |
773 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
774 | if (!info) | |
775 | return -ENOMEM; | |
776 | ||
67207b96 AB |
777 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
778 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
779 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
780 | sb->s_magic = SPUFS_MAGIC; | |
781 | sb->s_op = &s_ops; | |
2c3e4787 | 782 | sb->s_fs_info = info; |
67207b96 AB |
783 | |
784 | return spufs_create_root(sb, data); | |
785 | } | |
786 | ||
fc14f2fe AV |
787 | static struct dentry * |
788 | spufs_mount(struct file_system_type *fstype, int flags, | |
789 | const char *name, void *data) | |
67207b96 | 790 | { |
fc14f2fe | 791 | return mount_single(fstype, flags, data, spufs_fill_super); |
67207b96 AB |
792 | } |
793 | ||
794 | static struct file_system_type spufs_type = { | |
795 | .owner = THIS_MODULE, | |
796 | .name = "spufs", | |
fc14f2fe | 797 | .mount = spufs_mount, |
67207b96 AB |
798 | .kill_sb = kill_litter_super, |
799 | }; | |
800 | ||
e78b47a5 | 801 | static int __init spufs_init(void) |
67207b96 AB |
802 | { |
803 | int ret; | |
bf1ab978 | 804 | |
ccf17e9d JK |
805 | ret = -ENODEV; |
806 | if (!spu_management_ops) | |
807 | goto out; | |
808 | ||
67207b96 AB |
809 | ret = -ENOMEM; |
810 | spufs_inode_cache = kmem_cache_create("spufs_inode_cache", | |
811 | sizeof(struct spufs_inode_info), 0, | |
20c2df83 | 812 | SLAB_HWCACHE_ALIGN, spufs_init_once); |
67207b96 AB |
813 | |
814 | if (!spufs_inode_cache) | |
815 | goto out; | |
c99c1994 | 816 | ret = spu_sched_init(); |
67207b96 AB |
817 | if (ret) |
818 | goto out_cache; | |
640045a1 | 819 | ret = register_spu_syscalls(&spufs_calls); |
c99c1994 AM |
820 | if (ret) |
821 | goto out_sched; | |
640045a1 | 822 | ret = register_filesystem(&spufs_type); |
bf1ab978 | 823 | if (ret) |
640045a1 | 824 | goto out_syscalls; |
0afacde3 AB |
825 | |
826 | spufs_init_isolated_loader(); | |
bf1ab978 | 827 | |
67207b96 | 828 | return 0; |
c99c1994 | 829 | |
640045a1 AV |
830 | out_syscalls: |
831 | unregister_spu_syscalls(&spufs_calls); | |
c99c1994 AM |
832 | out_sched: |
833 | spu_sched_exit(); | |
67207b96 AB |
834 | out_cache: |
835 | kmem_cache_destroy(spufs_inode_cache); | |
836 | out: | |
837 | return ret; | |
838 | } | |
839 | module_init(spufs_init); | |
840 | ||
e78b47a5 | 841 | static void __exit spufs_exit(void) |
67207b96 | 842 | { |
8b3d6663 | 843 | spu_sched_exit(); |
db1384b4 | 844 | spufs_exit_isolated_loader(); |
67207b96 AB |
845 | unregister_spu_syscalls(&spufs_calls); |
846 | unregister_filesystem(&spufs_type); | |
847 | kmem_cache_destroy(spufs_inode_cache); | |
848 | } | |
849 | module_exit(spufs_exit); | |
850 | ||
851 | MODULE_LICENSE("GPL"); | |
852 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); | |
853 |