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/uaccess.h>
43 static kmem_cache_t *spufs_inode_cache;
46 spufs_alloc_inode(struct super_block *sb)
48 struct spufs_inode_info *ei;
50 ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
57 return &ei->vfs_inode;
61 spufs_destroy_inode(struct inode *inode)
63 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
67 spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
69 struct spufs_inode_info *ei = p;
71 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
72 SLAB_CTOR_CONSTRUCTOR) {
73 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;
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);
196 spufs_prune_dir(dir);
200 static int spufs_dir_close(struct inode *inode, struct file *file)
202 struct spu_context *ctx;
203 struct inode *parent;
207 dir = file->f_dentry;
208 parent = dir->d_parent->d_inode;
209 ctx = SPUFS_I(dir->d_inode)->i_ctx;
211 mutex_lock(&parent->i_mutex);
212 ret = spufs_rmdir(parent, dir);
213 mutex_unlock(&parent->i_mutex);
216 /* We have to give up the mm_struct */
219 return dcache_dir_close(inode, file);
222 struct inode_operations spufs_dir_inode_operations = {
223 .lookup = simple_lookup,
226 struct file_operations spufs_context_fops = {
227 .open = dcache_dir_open,
228 .release = spufs_dir_close,
229 .llseek = dcache_dir_lseek,
230 .read = generic_read_dir,
231 .readdir = dcache_readdir,
232 .fsync = simple_sync_file,
236 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
241 struct spu_context *ctx;
244 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
248 if (dir->i_mode & S_ISGID) {
249 inode->i_gid = dir->i_gid;
250 inode->i_mode &= S_ISGID;
252 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
253 SPUFS_I(inode)->i_ctx = ctx;
259 inode->i_op = &spufs_dir_inode_operations;
260 inode->i_fop = &simple_dir_operations;
261 if (flags & SPU_CREATE_NOSCHED)
262 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
265 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
270 d_instantiate(dentry, inode);
273 dentry->d_inode->i_nlink++;
277 put_spu_context(ctx);
284 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
289 ret = get_unused_fd();
296 filp = dentry_open(dentry, mnt, O_RDONLY);
303 filp->f_op = &spufs_context_fops;
304 fd_install(ret, filp);
309 static int spufs_create_context(struct inode *inode,
310 struct dentry *dentry,
311 struct vfsmount *mnt, int flags, int mode)
316 if ((flags & SPU_CREATE_NOSCHED) &&
317 !capable(CAP_SYS_NICE))
321 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
322 == SPU_CREATE_ISOLATE)
325 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
330 * get references for dget and mntget, will be released
331 * in error path of *_open().
333 ret = spufs_context_open(dget(dentry), mntget(mnt));
335 WARN_ON(spufs_rmdir(inode, dentry));
336 mutex_unlock(&inode->i_mutex);
337 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
342 mutex_unlock(&inode->i_mutex);
348 static int spufs_rmgang(struct inode *root, struct dentry *dir)
350 /* FIXME: this fails if the dir is not empty,
351 which causes a leak of gangs. */
352 return simple_rmdir(root, dir);
355 static int spufs_gang_close(struct inode *inode, struct file *file)
357 struct inode *parent;
361 dir = file->f_dentry;
362 parent = dir->d_parent->d_inode;
364 ret = spufs_rmgang(parent, dir);
367 return dcache_dir_close(inode, file);
370 struct file_operations spufs_gang_fops = {
371 .open = dcache_dir_open,
372 .release = spufs_gang_close,
373 .llseek = dcache_dir_lseek,
374 .read = generic_read_dir,
375 .readdir = dcache_readdir,
376 .fsync = simple_sync_file,
380 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
384 struct spu_gang *gang;
387 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
392 if (dir->i_mode & S_ISGID) {
393 inode->i_gid = dir->i_gid;
394 inode->i_mode &= S_ISGID;
396 gang = alloc_spu_gang();
397 SPUFS_I(inode)->i_ctx = NULL;
398 SPUFS_I(inode)->i_gang = gang;
402 inode->i_op = &spufs_dir_inode_operations;
403 inode->i_fop = &simple_dir_operations;
405 d_instantiate(dentry, inode);
408 dentry->d_inode->i_nlink++;
417 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
422 ret = get_unused_fd();
429 filp = dentry_open(dentry, mnt, O_RDONLY);
436 filp->f_op = &spufs_gang_fops;
437 fd_install(ret, filp);
442 static int spufs_create_gang(struct inode *inode,
443 struct dentry *dentry,
444 struct vfsmount *mnt, int mode)
448 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
453 * get references for dget and mntget, will be released
454 * in error path of *_open().
456 ret = spufs_gang_open(dget(dentry), mntget(mnt));
458 WARN_ON(spufs_rmgang(inode, dentry));
461 mutex_unlock(&inode->i_mutex);
467 static struct file_system_type spufs_type;
469 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode)
471 struct dentry *dentry;
475 /* check if we are on spufs */
476 if (nd->dentry->d_sb->s_type != &spufs_type)
479 /* don't accept undefined flags */
480 if (flags & (~SPU_CREATE_FLAG_ALL))
483 /* only threads can be underneath a gang */
484 if (nd->dentry != nd->dentry->d_sb->s_root) {
485 if ((flags & SPU_CREATE_GANG) ||
486 !SPUFS_I(nd->dentry->d_inode)->i_gang)
490 dentry = lookup_create(nd, 1);
491 ret = PTR_ERR(dentry);
499 mode &= ~current->fs->umask;
501 if (flags & SPU_CREATE_GANG)
502 return spufs_create_gang(nd->dentry->d_inode,
503 dentry, nd->mnt, mode);
505 return spufs_create_context(nd->dentry->d_inode,
506 dentry, nd->mnt, flags, mode);
511 mutex_unlock(&nd->dentry->d_inode->i_mutex);
516 /* File system initialization */
518 Opt_uid, Opt_gid, Opt_err,
521 static match_table_t spufs_tokens = {
522 { Opt_uid, "uid=%d" },
523 { Opt_gid, "gid=%d" },
528 spufs_parse_options(char *options, struct inode *root)
531 substring_t args[MAX_OPT_ARGS];
533 while ((p = strsep(&options, ",")) != NULL) {
539 token = match_token(p, spufs_tokens, args);
542 if (match_int(&args[0], &option))
544 root->i_uid = option;
547 if (match_int(&args[0], &option))
549 root->i_gid = option;
559 spufs_create_root(struct super_block *sb, void *data)
565 inode = spufs_new_inode(sb, S_IFDIR | 0775);
569 inode->i_op = &spufs_dir_inode_operations;
570 inode->i_fop = &simple_dir_operations;
571 SPUFS_I(inode)->i_ctx = NULL;
574 if (!spufs_parse_options(data, inode))
578 sb->s_root = d_alloc_root(inode);
590 spufs_fill_super(struct super_block *sb, void *data, int silent)
592 static struct super_operations s_ops = {
593 .alloc_inode = spufs_alloc_inode,
594 .destroy_inode = spufs_destroy_inode,
595 .statfs = simple_statfs,
596 .delete_inode = spufs_delete_inode,
597 .drop_inode = generic_delete_inode,
600 sb->s_maxbytes = MAX_LFS_FILESIZE;
601 sb->s_blocksize = PAGE_CACHE_SIZE;
602 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
603 sb->s_magic = SPUFS_MAGIC;
606 return spufs_create_root(sb, data);
610 spufs_get_sb(struct file_system_type *fstype, int flags,
611 const char *name, void *data, struct vfsmount *mnt)
613 return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
616 static struct file_system_type spufs_type = {
617 .owner = THIS_MODULE,
619 .get_sb = spufs_get_sb,
620 .kill_sb = kill_litter_super,
623 static int __init spufs_init(void)
627 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
628 sizeof(struct spufs_inode_info), 0,
629 SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
631 if (!spufs_inode_cache)
633 if (spu_sched_init() != 0) {
634 kmem_cache_destroy(spufs_inode_cache);
637 ret = register_filesystem(&spufs_type);
640 ret = register_spu_syscalls(&spufs_calls);
645 unregister_filesystem(&spufs_type);
647 kmem_cache_destroy(spufs_inode_cache);
651 module_init(spufs_init);
653 static void __exit spufs_exit(void)
656 unregister_spu_syscalls(&spufs_calls);
657 unregister_filesystem(&spufs_type);
658 kmem_cache_destroy(spufs_inode_cache);
660 module_exit(spufs_exit);
662 MODULE_LICENSE("GPL");
663 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");