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);
53 return &ei->vfs_inode;
57 spufs_destroy_inode(struct inode *inode)
59 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
63 spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
65 struct spufs_inode_info *ei = p;
67 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
68 SLAB_CTOR_CONSTRUCTOR) {
69 inode_init_once(&ei->vfs_inode);
74 spufs_new_inode(struct super_block *sb, int mode)
78 inode = new_inode(sb);
83 inode->i_uid = current->fsuid;
84 inode->i_gid = current->fsgid;
85 inode->i_blksize = PAGE_CACHE_SIZE;
87 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
93 spufs_setattr(struct dentry *dentry, struct iattr *attr)
95 struct inode *inode = dentry->d_inode;
97 if ((attr->ia_valid & ATTR_SIZE) &&
98 (attr->ia_size != inode->i_size))
100 return inode_setattr(inode, attr);
105 spufs_new_file(struct super_block *sb, struct dentry *dentry,
106 struct file_operations *fops, int mode,
107 struct spu_context *ctx)
109 static struct inode_operations spufs_file_iops = {
110 .setattr = spufs_setattr,
116 inode = spufs_new_inode(sb, S_IFREG | mode);
121 inode->i_op = &spufs_file_iops;
123 inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
124 d_add(dentry, inode);
130 spufs_delete_inode(struct inode *inode)
132 if (SPUFS_I(inode)->i_ctx)
133 put_spu_context(SPUFS_I(inode)->i_ctx);
138 spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
139 int mode, struct spu_context *ctx)
141 struct dentry *dentry;
144 while (files->name && files->name[0]) {
146 dentry = d_alloc_name(dir, files->name);
149 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
150 files->mode & mode, ctx);
157 // FIXME: remove all files that are left
162 static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
164 struct dentry *dentry, *tmp;
165 struct spu_context *ctx;
167 /* remove all entries */
169 down(&dir_dentry->d_inode->i_sem);
170 list_for_each_entry_safe(dentry, tmp, &dir_dentry->d_subdirs, d_child) {
171 spin_lock(&dcache_lock);
172 spin_lock(&dentry->d_lock);
173 if (!(d_unhashed(dentry)) && dentry->d_inode) {
176 spin_unlock(&dentry->d_lock);
177 simple_unlink(dir_dentry->d_inode, dentry);
178 spin_unlock(&dcache_lock);
181 spin_unlock(&dentry->d_lock);
182 spin_unlock(&dcache_lock);
185 shrink_dcache_parent(dir_dentry);
186 up(&dir_dentry->d_inode->i_sem);
189 /* We have to give up the mm_struct */
190 ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
193 /* XXX Do we need to hold i_sem here ? */
194 return simple_rmdir(root, dir_dentry);
197 static int spufs_dir_close(struct inode *inode, struct file *file)
200 struct dentry *dentry;
203 dentry = file->f_dentry;
204 dir = dentry->d_parent->d_inode;
206 ret = spufs_rmdir(dir, dentry);
209 return dcache_dir_close(inode, file);
212 struct inode_operations spufs_dir_inode_operations = {
213 .lookup = simple_lookup,
216 struct file_operations spufs_context_fops = {
217 .open = dcache_dir_open,
218 .release = spufs_dir_close,
219 .llseek = dcache_dir_lseek,
220 .read = generic_read_dir,
221 .readdir = dcache_readdir,
222 .fsync = simple_sync_file,
226 spufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
230 struct spu_context *ctx;
233 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
237 if (dir->i_mode & S_ISGID) {
238 inode->i_gid = dir->i_gid;
239 inode->i_mode &= S_ISGID;
241 ctx = alloc_spu_context(inode->i_mapping);
242 SPUFS_I(inode)->i_ctx = ctx;
246 inode->i_op = &spufs_dir_inode_operations;
247 inode->i_fop = &simple_dir_operations;
248 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
252 d_instantiate(dentry, inode);
255 dentry->d_inode->i_nlink++;
259 put_spu_context(ctx);
266 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
271 ret = get_unused_fd();
278 filp = dentry_open(dentry, mnt, O_RDONLY);
285 filp->f_op = &spufs_context_fops;
286 fd_install(ret, filp);
291 static struct file_system_type spufs_type;
294 spufs_create_thread(struct nameidata *nd, const char *name,
295 unsigned int flags, mode_t mode)
297 struct dentry *dentry;
300 /* need to be at the root of spufs */
302 if (nd->dentry->d_sb->s_type != &spufs_type ||
303 nd->dentry != nd->dentry->d_sb->s_root)
306 dentry = lookup_create(nd, 1);
307 ret = PTR_ERR(dentry);
315 mode &= ~current->fs->umask;
316 ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
321 * get references for dget and mntget, will be released
322 * in error path of *_open().
324 ret = spufs_context_open(dget(dentry), mntget(nd->mnt));
326 spufs_rmdir(nd->dentry->d_inode, dentry);
331 up(&nd->dentry->d_inode->i_sem);
336 /* File system initialization */
338 Opt_uid, Opt_gid, Opt_err,
341 static match_table_t spufs_tokens = {
342 { Opt_uid, "uid=%d" },
343 { Opt_gid, "gid=%d" },
348 spufs_parse_options(char *options, struct inode *root)
351 substring_t args[MAX_OPT_ARGS];
353 while ((p = strsep(&options, ",")) != NULL) {
359 token = match_token(p, spufs_tokens, args);
362 if (match_int(&args[0], &option))
364 root->i_uid = option;
367 if (match_int(&args[0], &option))
369 root->i_gid = option;
379 spufs_create_root(struct super_block *sb, void *data)
385 inode = spufs_new_inode(sb, S_IFDIR | 0775);
389 inode->i_op = &spufs_dir_inode_operations;
390 inode->i_fop = &simple_dir_operations;
391 SPUFS_I(inode)->i_ctx = NULL;
394 if (!spufs_parse_options(data, inode))
398 sb->s_root = d_alloc_root(inode);
410 spufs_fill_super(struct super_block *sb, void *data, int silent)
412 static struct super_operations s_ops = {
413 .alloc_inode = spufs_alloc_inode,
414 .destroy_inode = spufs_destroy_inode,
415 .statfs = simple_statfs,
416 .delete_inode = spufs_delete_inode,
417 .drop_inode = generic_delete_inode,
420 sb->s_maxbytes = MAX_LFS_FILESIZE;
421 sb->s_blocksize = PAGE_CACHE_SIZE;
422 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
423 sb->s_magic = SPUFS_MAGIC;
426 return spufs_create_root(sb, data);
429 static struct super_block *
430 spufs_get_sb(struct file_system_type *fstype, int flags,
431 const char *name, void *data)
433 return get_sb_single(fstype, flags, data, spufs_fill_super);
436 static struct file_system_type spufs_type = {
437 .owner = THIS_MODULE,
439 .get_sb = spufs_get_sb,
440 .kill_sb = kill_litter_super,
443 static int spufs_init(void)
447 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
448 sizeof(struct spufs_inode_info), 0,
449 SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
451 if (!spufs_inode_cache)
453 if (spu_sched_init() != 0) {
454 kmem_cache_destroy(spufs_inode_cache);
457 ret = register_filesystem(&spufs_type);
460 ret = register_spu_syscalls(&spufs_calls);
465 unregister_filesystem(&spufs_type);
467 kmem_cache_destroy(spufs_inode_cache);
471 module_init(spufs_init);
473 static void spufs_exit(void)
476 unregister_spu_syscalls(&spufs_calls);
477 unregister_filesystem(&spufs_type);
478 kmem_cache_destroy(spufs_inode_cache);
480 module_exit(spufs_exit);
482 MODULE_LICENSE("GPL");
483 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");