blob: 7123472801d922067ba5e801808245b4eef10b15 [file] [log] [blame]
Jan Blunck4ac91372008-02-14 19:34:32 -08001
Arnd Bergmann67207b92005-11-15 15:53:48 -05002/*
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>
Christoph Hellwig826be062008-05-06 09:24:24 +100026#include <linux/fsnotify.h>
Arnd Bergmann67207b92005-11-15 15:53:48 -050027#include <linux/backing-dev.h>
28#include <linux/init.h>
29#include <linux/ioctl.h>
30#include <linux/module.h>
Arnd Bergmann346f4d32006-01-04 20:31:26 +010031#include <linux/mount.h>
Arnd Bergmann67207b92005-11-15 15:53:48 -050032#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
arnd@arndb.de0afacde2006-10-24 18:31:18 +020038#include <asm/prom.h>
Arnd Bergmann67207b92005-11-15 15:53:48 -050039#include <asm/spu.h>
Jeremy Kerrccf17e92007-04-23 21:08:29 +020040#include <asm/spu_priv1.h>
Arnd Bergmann67207b92005-11-15 15:53:48 -050041#include <asm/uaccess.h>
42
43#include "spufs.h"
44
Jeremy Kerr2c3e4782008-07-03 11:42:20 +100045struct spufs_sb_info {
46 int debug;
47};
48
Christoph Lametere18b8902006-12-06 20:33:20 -080049static struct kmem_cache *spufs_inode_cache;
Jeremy Kerrc6730ed2006-11-20 18:45:10 +010050char *isolated_loader;
Sebastian Siewior8b0d3122007-09-19 14:38:12 +100051static int isolated_loader_size;
Arnd Bergmann67207b92005-11-15 15:53:48 -050052
Jeremy Kerr2c3e4782008-07-03 11:42:20 +100053static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
54{
55 return sb->s_fs_info;
56}
57
Arnd Bergmann67207b92005-11-15 15:53:48 -050058static struct inode *
59spufs_alloc_inode(struct super_block *sb)
60{
61 struct spufs_inode_info *ei;
62
Christoph Lametere94b1762006-12-06 20:33:17 -080063 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
Arnd Bergmann67207b92005-11-15 15:53:48 -050064 if (!ei)
65 return NULL;
Arnd Bergmann62632032006-10-04 17:26:15 +020066
67 ei->i_gang = NULL;
68 ei->i_ctx = NULL;
Christoph Hellwig43c2bbd2007-04-23 21:08:07 +020069 ei->i_openers = 0;
Arnd Bergmann62632032006-10-04 17:26:15 +020070
Arnd Bergmann67207b92005-11-15 15:53:48 -050071 return &ei->vfs_inode;
72}
73
74static void
75spufs_destroy_inode(struct inode *inode)
76{
77 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
78}
79
80static void
Christoph Lameter4ba9b9d2007-10-16 23:25:51 -070081spufs_init_once(struct kmem_cache *cachep, void *p)
Arnd Bergmann67207b92005-11-15 15:53:48 -050082{
83 struct spufs_inode_info *ei = p;
84
Christoph Lametera35afb82007-05-16 22:10:57 -070085 inode_init_once(&ei->vfs_inode);
Arnd Bergmann67207b92005-11-15 15:53:48 -050086}
87
88static struct inode *
89spufs_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;
98 inode->i_uid = current->fsuid;
99 inode->i_gid = current->fsgid;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500100 inode->i_blocks = 0;
101 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
102out:
103 return inode;
104}
105
106static int
107spufs_setattr(struct dentry *dentry, struct iattr *attr)
108{
109 struct inode *inode = dentry->d_inode;
110
Arnd Bergmann67207b92005-11-15 15:53:48 -0500111 if ((attr->ia_valid & ATTR_SIZE) &&
112 (attr->ia_size != inode->i_size))
113 return -EINVAL;
114 return inode_setattr(inode, attr);
115}
116
117
118static int
119spufs_new_file(struct super_block *sb, struct dentry *dentry,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800120 const struct file_operations *fops, int mode,
Jeremy Kerr23d893f2008-06-30 12:17:28 +1000121 size_t size, struct spu_context *ctx)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500122{
123 static struct inode_operations spufs_file_iops = {
Arnd Bergmann67207b92005-11-15 15:53:48 -0500124 .setattr = spufs_setattr,
Arnd Bergmann67207b92005-11-15 15:53:48 -0500125 };
126 struct inode *inode;
127 int ret;
128
129 ret = -ENOSPC;
130 inode = spufs_new_inode(sb, S_IFREG | mode);
131 if (!inode)
132 goto out;
133
134 ret = 0;
135 inode->i_op = &spufs_file_iops;
136 inode->i_fop = fops;
Jeremy Kerr23d893f2008-06-30 12:17:28 +1000137 inode->i_size = size;
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700138 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500139 d_add(dentry, inode);
140out:
141 return ret;
142}
143
144static void
145spufs_delete_inode(struct inode *inode)
146{
Arnd Bergmann62632032006-10-04 17:26:15 +0200147 struct spufs_inode_info *ei = SPUFS_I(inode);
148
149 if (ei->i_ctx)
150 put_spu_context(ei->i_ctx);
151 if (ei->i_gang)
152 put_spu_gang(ei->i_gang);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500153 clear_inode(inode);
154}
155
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100156static void spufs_prune_dir(struct dentry *dir)
157{
158 struct dentry *dentry, *tmp;
Arnd Bergmann62632032006-10-04 17:26:15 +0200159
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800160 mutex_lock(&dir->d_inode->i_mutex);
Andrew Mortonc3a9aea2006-01-09 20:51:24 -0800161 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100162 spin_lock(&dcache_lock);
163 spin_lock(&dentry->d_lock);
164 if (!(d_unhashed(dentry)) && dentry->d_inode) {
165 dget_locked(dentry);
166 __d_drop(dentry);
167 spin_unlock(&dentry->d_lock);
168 simple_unlink(dir->d_inode, dentry);
169 spin_unlock(&dcache_lock);
170 dput(dentry);
171 } else {
172 spin_unlock(&dentry->d_lock);
173 spin_unlock(&dcache_lock);
174 }
175 }
176 shrink_dcache_parent(dir);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800177 mutex_unlock(&dir->d_inode->i_mutex);
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100178}
179
Arnd Bergmann62632032006-10-04 17:26:15 +0200180/* Caller must hold parent->i_mutex */
181static int spufs_rmdir(struct inode *parent, struct dentry *dir)
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100182{
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100183 /* remove all entries */
Arnd Bergmann62632032006-10-04 17:26:15 +0200184 spufs_prune_dir(dir);
Jeremy Kerrc443aca2007-11-16 13:32:23 +1100185 d_drop(dir);
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100186
Arnd Bergmann62632032006-10-04 17:26:15 +0200187 return simple_rmdir(parent, dir);
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100188}
189
Jeremy Kerr23d893f2008-06-30 12:17:28 +1000190static int spufs_fill_dir(struct dentry *dir, struct spufs_tree_descr *files,
Arnd Bergmann3f51dd92006-01-04 20:31:27 +0100191 int mode, struct spu_context *ctx)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500192{
Sebastian Siewior87873c82007-06-06 14:03:58 +1000193 struct dentry *dentry, *tmp;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500194 int ret;
195
196 while (files->name && files->name[0]) {
197 ret = -ENOMEM;
198 dentry = d_alloc_name(dir, files->name);
199 if (!dentry)
200 goto out;
201 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
Jeremy Kerr23d893f2008-06-30 12:17:28 +1000202 files->mode & mode, files->size, ctx);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500203 if (ret)
204 goto out;
205 files++;
206 }
207 return 0;
208out:
Sebastian Siewior87873c82007-06-06 14:03:58 +1000209 /*
210 * remove all children from dir. dir->inode is not set so don't
211 * just simply use spufs_prune_dir() and panic afterwards :)
212 * dput() looks like it will do the right thing:
213 * - dec parent's ref counter
214 * - remove child from parent's child list
215 * - free child's inode if possible
216 * - free child
217 */
218 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
219 dput(dentry);
220 }
221
222 shrink_dcache_parent(dir);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500223 return ret;
224}
225
Arnd Bergmann67207b92005-11-15 15:53:48 -0500226static int spufs_dir_close(struct inode *inode, struct file *file)
227{
Michael Ellerman0309f022006-06-19 20:33:22 +0200228 struct spu_context *ctx;
Arnd Bergmann62632032006-10-04 17:26:15 +0200229 struct inode *parent;
230 struct dentry *dir;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500231 int ret;
232
Josef Sipekb4d1ab52006-12-08 02:37:30 -0800233 dir = file->f_path.dentry;
Arnd Bergmann62632032006-10-04 17:26:15 +0200234 parent = dir->d_parent->d_inode;
235 ctx = SPUFS_I(dir->d_inode)->i_ctx;
Arnd Bergmannc8ca0632006-01-04 20:31:22 +0100236
Christoph Hellwig02539d72008-05-08 15:29:12 +1000237 mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
Arnd Bergmann62632032006-10-04 17:26:15 +0200238 ret = spufs_rmdir(parent, dir);
239 mutex_unlock(&parent->i_mutex);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500240 WARN_ON(ret);
Arnd Bergmannc8ca0632006-01-04 20:31:22 +0100241
Michael Ellerman0309f022006-06-19 20:33:22 +0200242 /* We have to give up the mm_struct */
243 spu_forget(ctx);
244
Arnd Bergmann67207b92005-11-15 15:53:48 -0500245 return dcache_dir_close(inode, file);
246}
247
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800248const struct file_operations spufs_context_fops = {
Arnd Bergmann67207b92005-11-15 15:53:48 -0500249 .open = dcache_dir_open,
250 .release = spufs_dir_close,
251 .llseek = dcache_dir_lseek,
252 .read = generic_read_dir,
253 .readdir = dcache_readdir,
254 .fsync = simple_sync_file,
255};
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +0100256EXPORT_SYMBOL_GPL(spufs_context_fops);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500257
258static int
Arnd Bergmann9add11d2006-10-04 17:26:14 +0200259spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
260 int mode)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500261{
262 int ret;
263 struct inode *inode;
264 struct spu_context *ctx;
265
266 ret = -ENOSPC;
267 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
268 if (!inode)
269 goto out;
270
271 if (dir->i_mode & S_ISGID) {
272 inode->i_gid = dir->i_gid;
273 inode->i_mode &= S_ISGID;
274 }
Arnd Bergmann62632032006-10-04 17:26:15 +0200275 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
Arnd Bergmann67207b92005-11-15 15:53:48 -0500276 SPUFS_I(inode)->i_ctx = ctx;
277 if (!ctx)
278 goto out_iput;
279
Arnd Bergmann9add11d2006-10-04 17:26:14 +0200280 ctx->flags = flags;
Jeremy Kerrb8c295f2007-06-29 10:57:59 +1000281 inode->i_op = &simple_dir_inode_operations;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500282 inode->i_fop = &simple_dir_operations;
Mark Nutter5737edd2006-10-24 18:31:16 +0200283 if (flags & SPU_CREATE_NOSCHED)
284 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
285 mode, ctx);
286 else
287 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
288
Arnd Bergmann67207b92005-11-15 15:53:48 -0500289 if (ret)
290 goto out_free_ctx;
291
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000292 if (spufs_get_sb_info(dir->i_sb)->debug)
293 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
294 mode, ctx);
295
296 if (ret)
297 goto out_free_ctx;
298
Arnd Bergmann67207b92005-11-15 15:53:48 -0500299 d_instantiate(dentry, inode);
300 dget(dentry);
301 dir->i_nlink++;
Arnd Bergmann346f4d32006-01-04 20:31:26 +0100302 dentry->d_inode->i_nlink++;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500303 goto out;
304
305out_free_ctx:
Sebastian Siewior89df0082007-06-04 23:26:51 +1000306 spu_forget(ctx);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500307 put_spu_context(ctx);
308out_iput:
309 iput(inode);
310out:
311 return ret;
312}
313
Arnd Bergmann346f4d32006-01-04 20:31:26 +0100314static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
315{
316 int ret;
317 struct file *filp;
318
319 ret = get_unused_fd();
320 if (ret < 0) {
321 dput(dentry);
322 mntput(mnt);
323 goto out;
324 }
325
326 filp = dentry_open(dentry, mnt, O_RDONLY);
327 if (IS_ERR(filp)) {
328 put_unused_fd(ret);
329 ret = PTR_ERR(filp);
330 goto out;
331 }
332
333 filp->f_op = &spufs_context_fops;
334 fd_install(ret, filp);
335out:
336 return ret;
337}
338
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200339static struct spu_context *
340spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
341 struct file *filp)
342{
Andre Detsch58119062008-01-11 15:03:26 +1100343 struct spu_context *tmp, *neighbor, *err;
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200344 int count, node;
345 int aff_supp;
346
347 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
348 struct spu, cbe_list))->aff_list);
349
350 if (!aff_supp)
351 return ERR_PTR(-EINVAL);
352
353 if (flags & SPU_CREATE_GANG)
354 return ERR_PTR(-EINVAL);
355
356 if (flags & SPU_CREATE_AFFINITY_MEM &&
357 gang->aff_ref_ctx &&
358 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
359 return ERR_PTR(-EEXIST);
360
361 if (gang->aff_flags & AFF_MERGED)
362 return ERR_PTR(-EBUSY);
363
364 neighbor = NULL;
365 if (flags & SPU_CREATE_AFFINITY_SPU) {
366 if (!filp || filp->f_op != &spufs_context_fops)
367 return ERR_PTR(-EINVAL);
368
369 neighbor = get_spu_context(
370 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
371
372 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
373 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
374 !list_entry(neighbor->aff_list.next, struct spu_context,
Andre Detsch58119062008-01-11 15:03:26 +1100375 aff_list)->aff_head) {
376 err = ERR_PTR(-EEXIST);
377 goto out_put_neighbor;
378 }
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200379
Andre Detsch58119062008-01-11 15:03:26 +1100380 if (gang != neighbor->gang) {
381 err = ERR_PTR(-EINVAL);
382 goto out_put_neighbor;
383 }
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200384
385 count = 1;
386 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
387 count++;
388 if (list_empty(&neighbor->aff_list))
389 count++;
390
391 for (node = 0; node < MAX_NUMNODES; node++) {
392 if ((cbe_spu_info[node].n_spus - atomic_read(
393 &cbe_spu_info[node].reserved_spus)) >= count)
394 break;
395 }
396
Andre Detsch58119062008-01-11 15:03:26 +1100397 if (node == MAX_NUMNODES) {
398 err = ERR_PTR(-EEXIST);
399 goto out_put_neighbor;
400 }
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200401 }
402
403 return neighbor;
Andre Detsch58119062008-01-11 15:03:26 +1100404
405out_put_neighbor:
406 put_spu_context(neighbor);
407 return err;
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200408}
409
410static void
411spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
412 struct spu_context *neighbor)
413{
414 if (flags & SPU_CREATE_AFFINITY_MEM)
415 ctx->gang->aff_ref_ctx = ctx;
416
417 if (flags & SPU_CREATE_AFFINITY_SPU) {
418 if (list_empty(&neighbor->aff_list)) {
419 list_add_tail(&neighbor->aff_list,
420 &ctx->gang->aff_list_head);
421 neighbor->aff_head = 1;
422 }
423
424 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
425 || list_entry(neighbor->aff_list.next, struct spu_context,
426 aff_list)->aff_head) {
427 list_add(&ctx->aff_list, &neighbor->aff_list);
428 } else {
429 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
430 if (neighbor->aff_head) {
431 neighbor->aff_head = 0;
432 ctx->aff_head = 1;
433 }
434 }
435
436 if (!ctx->gang->aff_ref_ctx)
437 ctx->gang->aff_ref_ctx = ctx;
438 }
439}
440
441static int
442spufs_create_context(struct inode *inode, struct dentry *dentry,
443 struct vfsmount *mnt, int flags, int mode,
444 struct file *aff_filp)
Arnd Bergmann62632032006-10-04 17:26:15 +0200445{
446 int ret;
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200447 int affinity;
448 struct spu_gang *gang;
449 struct spu_context *neighbor;
Arnd Bergmann62632032006-10-04 17:26:15 +0200450
Mark Nutter5737edd2006-10-24 18:31:16 +0200451 ret = -EPERM;
452 if ((flags & SPU_CREATE_NOSCHED) &&
453 !capable(CAP_SYS_NICE))
454 goto out_unlock;
455
456 ret = -EINVAL;
457 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
458 == SPU_CREATE_ISOLATE)
459 goto out_unlock;
460
Jeremy Kerrbd2e5f82006-11-27 19:18:52 +0100461 ret = -ENODEV;
462 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
463 goto out_unlock;
464
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200465 gang = NULL;
466 neighbor = NULL;
467 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
468 if (affinity) {
469 gang = SPUFS_I(inode)->i_gang;
470 ret = -EINVAL;
471 if (!gang)
472 goto out_unlock;
473 mutex_lock(&gang->aff_mutex);
474 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
475 if (IS_ERR(neighbor)) {
476 ret = PTR_ERR(neighbor);
477 goto out_aff_unlock;
478 }
479 }
480
Arnd Bergmann62632032006-10-04 17:26:15 +0200481 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
482 if (ret)
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200483 goto out_aff_unlock;
484
Andre Detsch58119062008-01-11 15:03:26 +1100485 if (affinity) {
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200486 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
487 neighbor);
Andre Detsch58119062008-01-11 15:03:26 +1100488 if (neighbor)
489 put_spu_context(neighbor);
490 }
Arnd Bergmann62632032006-10-04 17:26:15 +0200491
492 /*
493 * get references for dget and mntget, will be released
494 * in error path of *_open().
495 */
496 ret = spufs_context_open(dget(dentry), mntget(mnt));
497 if (ret < 0) {
498 WARN_ON(spufs_rmdir(inode, dentry));
499 mutex_unlock(&inode->i_mutex);
500 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
501 goto out;
502 }
503
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200504out_aff_unlock:
505 if (affinity)
506 mutex_unlock(&gang->aff_mutex);
Arnd Bergmann62632032006-10-04 17:26:15 +0200507out_unlock:
508 mutex_unlock(&inode->i_mutex);
509out:
510 dput(dentry);
511 return ret;
512}
513
Arnd Bergmann62632032006-10-04 17:26:15 +0200514static int
515spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
516{
517 int ret;
518 struct inode *inode;
519 struct spu_gang *gang;
520
521 ret = -ENOSPC;
522 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
523 if (!inode)
524 goto out;
525
526 ret = 0;
527 if (dir->i_mode & S_ISGID) {
528 inode->i_gid = dir->i_gid;
529 inode->i_mode &= S_ISGID;
530 }
531 gang = alloc_spu_gang();
532 SPUFS_I(inode)->i_ctx = NULL;
533 SPUFS_I(inode)->i_gang = gang;
534 if (!gang)
535 goto out_iput;
536
Jeremy Kerrb8c295f2007-06-29 10:57:59 +1000537 inode->i_op = &simple_dir_inode_operations;
Arnd Bergmann62632032006-10-04 17:26:15 +0200538 inode->i_fop = &simple_dir_operations;
539
540 d_instantiate(dentry, inode);
Arnd Bergmann62632032006-10-04 17:26:15 +0200541 dir->i_nlink++;
542 dentry->d_inode->i_nlink++;
543 return ret;
544
545out_iput:
546 iput(inode);
547out:
548 return ret;
549}
550
551static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
552{
553 int ret;
554 struct file *filp;
555
556 ret = get_unused_fd();
557 if (ret < 0) {
558 dput(dentry);
559 mntput(mnt);
560 goto out;
561 }
562
563 filp = dentry_open(dentry, mnt, O_RDONLY);
564 if (IS_ERR(filp)) {
565 put_unused_fd(ret);
566 ret = PTR_ERR(filp);
567 goto out;
568 }
569
Jeremy Kerr877907d2007-06-04 23:26:51 +1000570 filp->f_op = &simple_dir_operations;
Arnd Bergmann62632032006-10-04 17:26:15 +0200571 fd_install(ret, filp);
572out:
573 return ret;
574}
575
576static int spufs_create_gang(struct inode *inode,
577 struct dentry *dentry,
578 struct vfsmount *mnt, int mode)
579{
580 int ret;
581
582 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
583 if (ret)
584 goto out;
585
586 /*
587 * get references for dget and mntget, will be released
588 * in error path of *_open().
589 */
590 ret = spufs_gang_open(dget(dentry), mntget(mnt));
Jeremy Kerr877907d2007-06-04 23:26:51 +1000591 if (ret < 0) {
592 int err = simple_rmdir(inode, dentry);
593 WARN_ON(err);
594 }
Arnd Bergmann62632032006-10-04 17:26:15 +0200595
596out:
597 mutex_unlock(&inode->i_mutex);
598 dput(dentry);
599 return ret;
600}
601
602
Arnd Bergmann346f4d32006-01-04 20:31:26 +0100603static struct file_system_type spufs_type;
604
Arnd Bergmann8e68e2f2007-07-20 21:39:47 +0200605long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
606 struct file *filp)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500607{
608 struct dentry *dentry;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500609 int ret;
610
Arnd Bergmann67207b92005-11-15 15:53:48 -0500611 ret = -EINVAL;
Arnd Bergmann62632032006-10-04 17:26:15 +0200612 /* check if we are on spufs */
Jan Blunck4ac91372008-02-14 19:34:32 -0800613 if (nd->path.dentry->d_sb->s_type != &spufs_type)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500614 goto out;
615
Arnd Bergmann62632032006-10-04 17:26:15 +0200616 /* don't accept undefined flags */
Arnd Bergmann9add11d2006-10-04 17:26:14 +0200617 if (flags & (~SPU_CREATE_FLAG_ALL))
arnd@arndb.dec9832942006-06-19 20:33:34 +0200618 goto out;
619
Arnd Bergmann62632032006-10-04 17:26:15 +0200620 /* only threads can be underneath a gang */
Jan Blunck4ac91372008-02-14 19:34:32 -0800621 if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
Arnd Bergmann62632032006-10-04 17:26:15 +0200622 if ((flags & SPU_CREATE_GANG) ||
Jan Blunck4ac91372008-02-14 19:34:32 -0800623 !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
Arnd Bergmann62632032006-10-04 17:26:15 +0200624 goto out;
625 }
626
Arnd Bergmann67207b92005-11-15 15:53:48 -0500627 dentry = lookup_create(nd, 1);
628 ret = PTR_ERR(dentry);
629 if (IS_ERR(dentry))
630 goto out_dir;
631
632 ret = -EEXIST;
633 if (dentry->d_inode)
634 goto out_dput;
635
636 mode &= ~current->fs->umask;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500637
Arnd Bergmann62632032006-10-04 17:26:15 +0200638 if (flags & SPU_CREATE_GANG)
Christoph Hellwig826be062008-05-06 09:24:24 +1000639 ret = spufs_create_gang(nd->path.dentry->d_inode,
Jan Blunck4ac91372008-02-14 19:34:32 -0800640 dentry, nd->path.mnt, mode);
Arnd Bergmann62632032006-10-04 17:26:15 +0200641 else
Christoph Hellwig826be062008-05-06 09:24:24 +1000642 ret = spufs_create_context(nd->path.dentry->d_inode,
Jan Blunck4ac91372008-02-14 19:34:32 -0800643 dentry, nd->path.mnt, flags, mode,
644 filp);
Christoph Hellwig826be062008-05-06 09:24:24 +1000645 if (ret >= 0)
646 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
647 return ret;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500648
649out_dput:
650 dput(dentry);
651out_dir:
Jan Blunck4ac91372008-02-14 19:34:32 -0800652 mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500653out:
654 return ret;
655}
656
657/* File system initialization */
658enum {
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000659 Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
Arnd Bergmann67207b92005-11-15 15:53:48 -0500660};
661
662static match_table_t spufs_tokens = {
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000663 { Opt_uid, "uid=%d" },
664 { Opt_gid, "gid=%d" },
665 { Opt_mode, "mode=%o" },
666 { Opt_debug, "debug" },
667 { Opt_err, NULL },
Arnd Bergmann67207b92005-11-15 15:53:48 -0500668};
669
670static int
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000671spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500672{
673 char *p;
674 substring_t args[MAX_OPT_ARGS];
675
676 while ((p = strsep(&options, ",")) != NULL) {
677 int token, option;
678
679 if (!*p)
680 continue;
681
682 token = match_token(p, spufs_tokens, args);
683 switch (token) {
684 case Opt_uid:
685 if (match_int(&args[0], &option))
686 return 0;
687 root->i_uid = option;
688 break;
689 case Opt_gid:
690 if (match_int(&args[0], &option))
691 return 0;
692 root->i_gid = option;
693 break;
Jeremy Kerrf11f5ee2007-04-23 21:08:23 +0200694 case Opt_mode:
695 if (match_octal(&args[0], &option))
696 return 0;
697 root->i_mode = option | S_IFDIR;
698 break;
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000699 case Opt_debug:
700 spufs_get_sb_info(sb)->debug = 1;
701 break;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500702 default:
703 return 0;
704 }
705 }
706 return 1;
707}
708
Akinobu Mitadb1384b2007-04-23 21:08:20 +0200709static void spufs_exit_isolated_loader(void)
710{
Sebastian Siewior8b0d3122007-09-19 14:38:12 +1000711 free_pages((unsigned long) isolated_loader,
712 get_order(isolated_loader_size));
Akinobu Mitadb1384b2007-04-23 21:08:20 +0200713}
714
arnd@arndb.de0afacde2006-10-24 18:31:18 +0200715static void
716spufs_init_isolated_loader(void)
717{
718 struct device_node *dn;
719 const char *loader;
720 int size;
721
722 dn = of_find_node_by_path("/spu-isolation");
723 if (!dn)
724 return;
725
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000726 loader = of_get_property(dn, "loader", &size);
arnd@arndb.de0afacde2006-10-24 18:31:18 +0200727 if (!loader)
728 return;
729
Sebastian Siewior8b0d3122007-09-19 14:38:12 +1000730 /* the loader must be align on a 16 byte boundary */
731 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
arnd@arndb.de0afacde2006-10-24 18:31:18 +0200732 if (!isolated_loader)
733 return;
734
Sebastian Siewior8b0d3122007-09-19 14:38:12 +1000735 isolated_loader_size = size;
arnd@arndb.de0afacde2006-10-24 18:31:18 +0200736 memcpy(isolated_loader, loader, size);
737 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
738}
739
Arnd Bergmann67207b92005-11-15 15:53:48 -0500740static int
Arnd Bergmann8b3d6662005-11-15 15:53:52 -0500741spufs_create_root(struct super_block *sb, void *data)
742{
Arnd Bergmann67207b92005-11-15 15:53:48 -0500743 struct inode *inode;
744 int ret;
745
Arnd Bergmann8f18a152007-06-04 23:26:51 +1000746 ret = -ENODEV;
747 if (!spu_management_ops)
748 goto out;
749
Arnd Bergmann67207b92005-11-15 15:53:48 -0500750 ret = -ENOMEM;
751 inode = spufs_new_inode(sb, S_IFDIR | 0775);
752 if (!inode)
753 goto out;
754
Jeremy Kerrb8c295f2007-06-29 10:57:59 +1000755 inode->i_op = &simple_dir_inode_operations;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500756 inode->i_fop = &simple_dir_operations;
757 SPUFS_I(inode)->i_ctx = NULL;
758
759 ret = -EINVAL;
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000760 if (!spufs_parse_options(sb, data, inode))
Arnd Bergmann67207b92005-11-15 15:53:48 -0500761 goto out_iput;
762
763 ret = -ENOMEM;
764 sb->s_root = d_alloc_root(inode);
765 if (!sb->s_root)
766 goto out_iput;
767
768 return 0;
769out_iput:
770 iput(inode);
771out:
772 return ret;
773}
774
775static int
776spufs_fill_super(struct super_block *sb, void *data, int silent)
777{
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000778 struct spufs_sb_info *info;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500779 static struct super_operations s_ops = {
780 .alloc_inode = spufs_alloc_inode,
781 .destroy_inode = spufs_destroy_inode,
782 .statfs = simple_statfs,
783 .delete_inode = spufs_delete_inode,
784 .drop_inode = generic_delete_inode,
Miklos Szeredi90d09e12008-02-08 04:21:47 -0800785 .show_options = generic_show_options,
Arnd Bergmann67207b92005-11-15 15:53:48 -0500786 };
787
Miklos Szeredi90d09e12008-02-08 04:21:47 -0800788 save_mount_options(sb, data);
789
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000790 info = kzalloc(sizeof(*info), GFP_KERNEL);
791 if (!info)
792 return -ENOMEM;
793
Arnd Bergmann67207b92005-11-15 15:53:48 -0500794 sb->s_maxbytes = MAX_LFS_FILESIZE;
795 sb->s_blocksize = PAGE_CACHE_SIZE;
796 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
797 sb->s_magic = SPUFS_MAGIC;
798 sb->s_op = &s_ops;
Jeremy Kerr2c3e4782008-07-03 11:42:20 +1000799 sb->s_fs_info = info;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500800
801 return spufs_create_root(sb, data);
802}
803
David Howells454e2392006-06-23 02:02:57 -0700804static int
Arnd Bergmann67207b92005-11-15 15:53:48 -0500805spufs_get_sb(struct file_system_type *fstype, int flags,
David Howells454e2392006-06-23 02:02:57 -0700806 const char *name, void *data, struct vfsmount *mnt)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500807{
David Howells454e2392006-06-23 02:02:57 -0700808 return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500809}
810
811static struct file_system_type spufs_type = {
812 .owner = THIS_MODULE,
813 .name = "spufs",
814 .get_sb = spufs_get_sb,
815 .kill_sb = kill_litter_super,
816};
817
Arnd Bergmanne78b47a2006-03-27 21:27:40 +0200818static int __init spufs_init(void)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500819{
820 int ret;
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +0100821
Jeremy Kerrccf17e92007-04-23 21:08:29 +0200822 ret = -ENODEV;
823 if (!spu_management_ops)
824 goto out;
825
Arnd Bergmann67207b92005-11-15 15:53:48 -0500826 ret = -ENOMEM;
827 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
828 sizeof(struct spufs_inode_info), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +0900829 SLAB_HWCACHE_ALIGN, spufs_init_once);
Arnd Bergmann67207b92005-11-15 15:53:48 -0500830
831 if (!spufs_inode_cache)
832 goto out;
Akinobu Mitac99c1992007-04-23 21:08:19 +0200833 ret = spu_sched_init();
Arnd Bergmann67207b92005-11-15 15:53:48 -0500834 if (ret)
835 goto out_cache;
Akinobu Mitac99c1992007-04-23 21:08:19 +0200836 ret = register_filesystem(&spufs_type);
837 if (ret)
838 goto out_sched;
Arnd Bergmann67207b92005-11-15 15:53:48 -0500839 ret = register_spu_syscalls(&spufs_calls);
840 if (ret)
841 goto out_fs;
arnd@arndb.de0afacde2006-10-24 18:31:18 +0200842
843 spufs_init_isolated_loader();
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +0100844
Arnd Bergmann67207b92005-11-15 15:53:48 -0500845 return 0;
Akinobu Mitac99c1992007-04-23 21:08:19 +0200846
Arnd Bergmann67207b92005-11-15 15:53:48 -0500847out_fs:
848 unregister_filesystem(&spufs_type);
Akinobu Mitac99c1992007-04-23 21:08:19 +0200849out_sched:
850 spu_sched_exit();
Arnd Bergmann67207b92005-11-15 15:53:48 -0500851out_cache:
852 kmem_cache_destroy(spufs_inode_cache);
853out:
854 return ret;
855}
856module_init(spufs_init);
857
Arnd Bergmanne78b47a2006-03-27 21:27:40 +0200858static void __exit spufs_exit(void)
Arnd Bergmann67207b92005-11-15 15:53:48 -0500859{
Arnd Bergmann8b3d6662005-11-15 15:53:52 -0500860 spu_sched_exit();
Akinobu Mitadb1384b2007-04-23 21:08:20 +0200861 spufs_exit_isolated_loader();
Arnd Bergmann67207b92005-11-15 15:53:48 -0500862 unregister_spu_syscalls(&spufs_calls);
863 unregister_filesystem(&spufs_type);
864 kmem_cache_destroy(spufs_inode_cache);
865}
866module_exit(spufs_exit);
867
868MODULE_LICENSE("GPL");
869MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
870