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
);
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>");