4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
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)
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.
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.
23 #include <linux/file.h>
25 #include <linux/backing-dev.h>
26 #include <linux/init.h>
27 #include <linux/ioctl.h>
28 #include <linux/module.h>
29 #include <linux/mount.h>
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>
37 #include <asm/semaphore.h>
39 #include <asm/spu_priv1.h>
40 #include <asm/uaccess.h>
44 static struct kmem_cache *spufs_inode_cache;
45 char *isolated_loader;
48 spufs_alloc_inode(struct super_block *sb)
50 struct spufs_inode_info *ei;
52 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
60 return &ei->vfs_inode;
64 spufs_destroy_inode(struct inode *inode)
66 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
70 spufs_init_once(void *p, struct kmem_cache * cachep, unsigned long flags)
72 struct spufs_inode_info *ei = p;
74 inode_init_once(&ei->vfs_inode);
78 spufs_new_inode(struct super_block *sb, int mode)
82 inode = new_inode(sb);
87 inode->i_uid = current->fsuid;
88 inode->i_gid = current->fsgid;
90 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
96 spufs_setattr(struct dentry *dentry, struct iattr *attr)
98 struct inode *inode = dentry->d_inode;
100 if ((attr->ia_valid & ATTR_SIZE) &&
101 (attr->ia_size != inode->i_size))
103 return inode_setattr(inode, attr);
108 spufs_new_file(struct super_block *sb, struct dentry *dentry,
109 const struct file_operations *fops, int mode,
110 struct spu_context *ctx)
112 static struct inode_operations spufs_file_iops = {
113 .setattr = spufs_setattr,
119 inode = spufs_new_inode(sb, S_IFREG | mode);
124 inode->i_op = &spufs_file_iops;
126 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
127 d_add(dentry, inode);
133 spufs_delete_inode(struct inode *inode)
135 struct spufs_inode_info *ei = SPUFS_I(inode);
138 put_spu_context(ei->i_ctx);
140 put_spu_gang(ei->i_gang);
144 static void spufs_prune_dir(struct dentry *dir)
146 struct dentry *dentry, *tmp;
148 mutex_lock(&dir->d_inode->i_mutex);
149 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
150 spin_lock(&dcache_lock);
151 spin_lock(&dentry->d_lock);
152 if (!(d_unhashed(dentry)) && dentry->d_inode) {
155 spin_unlock(&dentry->d_lock);
156 simple_unlink(dir->d_inode, dentry);
157 spin_unlock(&dcache_lock);
160 spin_unlock(&dentry->d_lock);
161 spin_unlock(&dcache_lock);
164 shrink_dcache_parent(dir);
165 mutex_unlock(&dir->d_inode->i_mutex);
168 /* Caller must hold parent->i_mutex */
169 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
171 /* remove all entries */
172 spufs_prune_dir(dir);
174 return simple_rmdir(parent, dir);
177 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
178 int mode, struct spu_context *ctx)
180 struct dentry *dentry, *tmp;
183 while (files->name && files->name[0]) {
185 dentry = d_alloc_name(dir, files->name);
188 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
189 files->mode & mode, ctx);
197 * remove all children from dir. dir->inode is not set so don't
198 * just simply use spufs_prune_dir() and panic afterwards :)
199 * dput() looks like it will do the right thing:
200 * - dec parent's ref counter
201 * - remove child from parent's child list
202 * - free child's inode if possible
205 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
209 shrink_dcache_parent(dir);
213 static int spufs_dir_close(struct inode *inode, struct file *file)
215 struct spu_context *ctx;
216 struct inode *parent;
220 dir = file->f_path.dentry;
221 parent = dir->d_parent->d_inode;
222 ctx = SPUFS_I(dir->d_inode)->i_ctx;
224 mutex_lock(&parent->i_mutex);
225 ret = spufs_rmdir(parent, dir);
226 mutex_unlock(&parent->i_mutex);
229 /* We have to give up the mm_struct */
232 return dcache_dir_close(inode, file);
235 const struct file_operations spufs_context_fops = {
236 .open = dcache_dir_open,
237 .release = spufs_dir_close,
238 .llseek = dcache_dir_lseek,
239 .read = generic_read_dir,
240 .readdir = dcache_readdir,
241 .fsync = simple_sync_file,
243 EXPORT_SYMBOL_GPL(spufs_context_fops);
246 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
251 struct spu_context *ctx;
254 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
258 if (dir->i_mode & S_ISGID) {
259 inode->i_gid = dir->i_gid;
260 inode->i_mode &= S_ISGID;
262 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
263 SPUFS_I(inode)->i_ctx = ctx;
268 inode->i_op = &simple_dir_inode_operations;
269 inode->i_fop = &simple_dir_operations;
270 if (flags & SPU_CREATE_NOSCHED)
271 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
274 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
279 d_instantiate(dentry, inode);
282 dentry->d_inode->i_nlink++;
287 put_spu_context(ctx);
294 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
299 ret = get_unused_fd();
306 filp = dentry_open(dentry, mnt, O_RDONLY);
313 filp->f_op = &spufs_context_fops;
314 fd_install(ret, filp);
319 static int spufs_create_context(struct inode *inode,
320 struct dentry *dentry,
321 struct vfsmount *mnt, int flags, int mode)
326 if ((flags & SPU_CREATE_NOSCHED) &&
327 !capable(CAP_SYS_NICE))
331 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
332 == SPU_CREATE_ISOLATE)
336 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
339 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
344 * get references for dget and mntget, will be released
345 * in error path of *_open().
347 ret = spufs_context_open(dget(dentry), mntget(mnt));
349 WARN_ON(spufs_rmdir(inode, dentry));
350 mutex_unlock(&inode->i_mutex);
351 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
356 mutex_unlock(&inode->i_mutex);
363 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
367 struct spu_gang *gang;
370 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
375 if (dir->i_mode & S_ISGID) {
376 inode->i_gid = dir->i_gid;
377 inode->i_mode &= S_ISGID;
379 gang = alloc_spu_gang();
380 SPUFS_I(inode)->i_ctx = NULL;
381 SPUFS_I(inode)->i_gang = gang;
385 inode->i_op = &simple_dir_inode_operations;
386 inode->i_fop = &simple_dir_operations;
388 d_instantiate(dentry, inode);
390 dentry->d_inode->i_nlink++;
399 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
404 ret = get_unused_fd();
411 filp = dentry_open(dentry, mnt, O_RDONLY);
418 filp->f_op = &simple_dir_operations;
419 fd_install(ret, filp);
424 static int spufs_create_gang(struct inode *inode,
425 struct dentry *dentry,
426 struct vfsmount *mnt, int mode)
430 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
435 * get references for dget and mntget, will be released
436 * in error path of *_open().
438 ret = spufs_gang_open(dget(dentry), mntget(mnt));
440 int err = simple_rmdir(inode, dentry);
445 mutex_unlock(&inode->i_mutex);
451 static struct file_system_type spufs_type;
453 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode)
455 struct dentry *dentry;
459 /* check if we are on spufs */
460 if (nd->dentry->d_sb->s_type != &spufs_type)
463 /* don't accept undefined flags */
464 if (flags & (~SPU_CREATE_FLAG_ALL))
467 /* only threads can be underneath a gang */
468 if (nd->dentry != nd->dentry->d_sb->s_root) {
469 if ((flags & SPU_CREATE_GANG) ||
470 !SPUFS_I(nd->dentry->d_inode)->i_gang)
474 dentry = lookup_create(nd, 1);
475 ret = PTR_ERR(dentry);
483 mode &= ~current->fs->umask;
485 if (flags & SPU_CREATE_GANG)
486 return spufs_create_gang(nd->dentry->d_inode,
487 dentry, nd->mnt, mode);
489 return spufs_create_context(nd->dentry->d_inode,
490 dentry, nd->mnt, flags, mode);
495 mutex_unlock(&nd->dentry->d_inode->i_mutex);
500 /* File system initialization */
502 Opt_uid, Opt_gid, Opt_mode, Opt_err,
505 static match_table_t spufs_tokens = {
506 { Opt_uid, "uid=%d" },
507 { Opt_gid, "gid=%d" },
508 { Opt_mode, "mode=%o" },
513 spufs_parse_options(char *options, struct inode *root)
516 substring_t args[MAX_OPT_ARGS];
518 while ((p = strsep(&options, ",")) != NULL) {
524 token = match_token(p, spufs_tokens, args);
527 if (match_int(&args[0], &option))
529 root->i_uid = option;
532 if (match_int(&args[0], &option))
534 root->i_gid = option;
537 if (match_octal(&args[0], &option))
539 root->i_mode = option | S_IFDIR;
548 static void spufs_exit_isolated_loader(void)
550 kfree(isolated_loader);
554 spufs_init_isolated_loader(void)
556 struct device_node *dn;
560 dn = of_find_node_by_path("/spu-isolation");
564 loader = of_get_property(dn, "loader", &size);
568 /* kmalloc should align on a 16 byte boundary..* */
569 isolated_loader = kmalloc(size, GFP_KERNEL);
570 if (!isolated_loader)
573 memcpy(isolated_loader, loader, size);
574 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
578 spufs_create_root(struct super_block *sb, void *data)
584 if (!spu_management_ops)
588 inode = spufs_new_inode(sb, S_IFDIR | 0775);
592 inode->i_op = &simple_dir_inode_operations;
593 inode->i_fop = &simple_dir_operations;
594 SPUFS_I(inode)->i_ctx = NULL;
597 if (!spufs_parse_options(data, inode))
601 sb->s_root = d_alloc_root(inode);
613 spufs_fill_super(struct super_block *sb, void *data, int silent)
615 static struct super_operations s_ops = {
616 .alloc_inode = spufs_alloc_inode,
617 .destroy_inode = spufs_destroy_inode,
618 .statfs = simple_statfs,
619 .delete_inode = spufs_delete_inode,
620 .drop_inode = generic_delete_inode,
623 sb->s_maxbytes = MAX_LFS_FILESIZE;
624 sb->s_blocksize = PAGE_CACHE_SIZE;
625 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
626 sb->s_magic = SPUFS_MAGIC;
629 return spufs_create_root(sb, data);
633 spufs_get_sb(struct file_system_type *fstype, int flags,
634 const char *name, void *data, struct vfsmount *mnt)
636 return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
639 static struct file_system_type spufs_type = {
640 .owner = THIS_MODULE,
642 .get_sb = spufs_get_sb,
643 .kill_sb = kill_litter_super,
646 static int __init spufs_init(void)
651 if (!spu_management_ops)
655 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
656 sizeof(struct spufs_inode_info), 0,
657 SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
659 if (!spufs_inode_cache)
661 ret = spu_sched_init();
664 ret = register_filesystem(&spufs_type);
667 ret = register_spu_syscalls(&spufs_calls);
670 ret = register_arch_coredump_calls(&spufs_coredump_calls);
674 spufs_init_isolated_loader();
679 unregister_spu_syscalls(&spufs_calls);
681 unregister_filesystem(&spufs_type);
685 kmem_cache_destroy(spufs_inode_cache);
689 module_init(spufs_init);
691 static void __exit spufs_exit(void)
694 spufs_exit_isolated_loader();
695 unregister_arch_coredump_calls(&spufs_coredump_calls);
696 unregister_spu_syscalls(&spufs_calls);
697 unregister_filesystem(&spufs_type);
698 kmem_cache_destroy(spufs_inode_cache);
700 module_exit(spufs_exit);
702 MODULE_LICENSE("GPL");
703 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");