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/namei.h>
30 #include <linux/pagemap.h>
31 #include <linux/poll.h>
32 #include <linux/slab.h>
33 #include <linux/parser.h>
36 #include <asm/semaphore.h>
38 #include <asm/uaccess.h>
42 static kmem_cache_t *spufs_inode_cache;
44 /* Information about the backing dev, same as ramfs */
46 static struct backing_dev_info spufs_backing_dev_info = {
47 .ra_pages = 0, /* No readahead */
48 .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
49 BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY | BDI_CAP_READ_MAP |
53 static struct address_space_operations spufs_aops = {
54 .readpage = simple_readpage,
55 .prepare_write = simple_prepare_write,
56 .commit_write = simple_commit_write,
60 /* Inode operations */
63 spufs_alloc_inode(struct super_block *sb)
65 struct spufs_inode_info *ei;
67 ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
70 return &ei->vfs_inode;
74 spufs_destroy_inode(struct inode *inode)
76 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
80 spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
82 struct spufs_inode_info *ei = p;
84 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
85 SLAB_CTOR_CONSTRUCTOR) {
86 inode_init_once(&ei->vfs_inode);
91 spufs_new_inode(struct super_block *sb, int mode)
95 inode = new_inode(sb);
100 inode->i_uid = current->fsuid;
101 inode->i_gid = current->fsgid;
102 inode->i_blksize = PAGE_CACHE_SIZE;
104 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
110 spufs_setattr(struct dentry *dentry, struct iattr *attr)
112 struct inode *inode = dentry->d_inode;
115 pr_debug("ia_size %lld, i_size:%lld\n", attr->ia_size, inode->i_size);
117 if ((attr->ia_valid & ATTR_SIZE) &&
118 (attr->ia_size != inode->i_size))
120 return inode_setattr(inode, attr);
125 spufs_new_file(struct super_block *sb, struct dentry *dentry,
126 struct file_operations *fops, int mode,
127 struct spu_context *ctx)
129 static struct inode_operations spufs_file_iops = {
130 .getattr = simple_getattr,
131 .setattr = spufs_setattr,
132 .unlink = simple_unlink,
138 inode = spufs_new_inode(sb, S_IFREG | mode);
143 inode->i_op = &spufs_file_iops;
145 inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
146 d_add(dentry, inode);
152 spufs_delete_inode(struct inode *inode)
154 if (SPUFS_I(inode)->i_ctx)
155 put_spu_context(SPUFS_I(inode)->i_ctx);
160 spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
161 int mode, struct spu_context *ctx)
163 struct dentry *dentry;
166 while (files->name && files->name[0]) {
168 dentry = d_alloc_name(dir, files->name);
171 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
172 files->mode & mode, ctx);
179 // FIXME: remove all files that are left
184 static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
186 struct dentry *dentry;
189 spin_lock(&dcache_lock);
190 /* remove all entries */
192 list_for_each_entry(dentry, &dir_dentry->d_subdirs, d_child) {
193 if (d_unhashed(dentry) || !dentry->d_inode)
195 atomic_dec(&dentry->d_count);
196 spin_lock(&dentry->d_lock);
198 spin_unlock(&dentry->d_lock);
200 spin_unlock(&dcache_lock);
202 shrink_dcache_parent(dir_dentry);
203 err = simple_rmdir(root, dir_dentry);
208 static int spufs_dir_close(struct inode *inode, struct file *file)
211 struct dentry *dentry;
214 dentry = file->f_dentry;
215 dir = dentry->d_parent->d_inode;
217 ret = spufs_rmdir(dir, file->f_dentry);
220 return dcache_dir_close(inode, file);
223 struct inode_operations spufs_dir_inode_operations = {
224 .lookup = simple_lookup,
227 struct file_operations spufs_autodelete_dir_operations = {
228 .open = dcache_dir_open,
229 .release = spufs_dir_close,
230 .llseek = dcache_dir_lseek,
231 .read = generic_read_dir,
232 .readdir = dcache_readdir,
233 .fsync = simple_sync_file,
237 spufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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();
253 SPUFS_I(inode)->i_ctx = ctx;
257 inode->i_op = &spufs_dir_inode_operations;
258 inode->i_fop = &simple_dir_operations;
259 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
263 d_instantiate(dentry, inode);
269 put_spu_context(ctx);
277 spufs_create_thread(struct nameidata *nd, const char *name,
278 unsigned int flags, mode_t mode)
280 struct dentry *dentry;
284 /* need to be at the root of spufs */
286 if (nd->dentry->d_sb->s_magic != SPUFS_MAGIC ||
287 nd->dentry != nd->dentry->d_sb->s_root)
290 dentry = lookup_create(nd, 1);
291 ret = PTR_ERR(dentry);
299 mode &= ~current->fs->umask;
300 ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
304 ret = get_unused_fd();
308 dentry->d_inode->i_nlink++;
310 filp = filp_open(name, O_RDONLY, mode);
312 // FIXME: remove directory again
316 filp->f_op = &spufs_autodelete_dir_operations;
317 fd_install(ret, filp);
323 up(&nd->dentry->d_inode->i_sem);
328 /* File system initialization */
330 Opt_uid, Opt_gid, Opt_err,
333 static match_table_t spufs_tokens = {
334 { Opt_uid, "uid=%d" },
335 { Opt_gid, "gid=%d" },
340 spufs_parse_options(char *options, struct inode *root)
343 substring_t args[MAX_OPT_ARGS];
345 while ((p = strsep(&options, ",")) != NULL) {
351 token = match_token(p, spufs_tokens, args);
354 if (match_int(&args[0], &option))
356 root->i_uid = option;
359 if (match_int(&args[0], &option))
361 root->i_gid = option;
371 spufs_create_root(struct super_block *sb, void *data) {
376 inode = spufs_new_inode(sb, S_IFDIR | 0775);
380 inode->i_op = &spufs_dir_inode_operations;
381 inode->i_fop = &simple_dir_operations;
382 SPUFS_I(inode)->i_ctx = NULL;
385 if (!spufs_parse_options(data, inode))
389 sb->s_root = d_alloc_root(inode);
401 spufs_fill_super(struct super_block *sb, void *data, int silent)
403 static struct super_operations s_ops = {
404 .alloc_inode = spufs_alloc_inode,
405 .destroy_inode = spufs_destroy_inode,
406 .statfs = simple_statfs,
407 .delete_inode = spufs_delete_inode,
408 .drop_inode = generic_delete_inode,
411 sb->s_maxbytes = MAX_LFS_FILESIZE;
412 sb->s_blocksize = PAGE_CACHE_SIZE;
413 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
414 sb->s_magic = SPUFS_MAGIC;
417 return spufs_create_root(sb, data);
420 static struct super_block *
421 spufs_get_sb(struct file_system_type *fstype, int flags,
422 const char *name, void *data)
424 return get_sb_single(fstype, flags, data, spufs_fill_super);
427 static struct file_system_type spufs_type = {
428 .owner = THIS_MODULE,
430 .get_sb = spufs_get_sb,
431 .kill_sb = kill_litter_super,
434 static int spufs_init(void)
438 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
439 sizeof(struct spufs_inode_info), 0,
440 SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
442 if (!spufs_inode_cache)
444 ret = register_filesystem(&spufs_type);
447 ret = register_spu_syscalls(&spufs_calls);
452 unregister_filesystem(&spufs_type);
454 kmem_cache_destroy(spufs_inode_cache);
458 module_init(spufs_init);
460 static void spufs_exit(void)
462 unregister_spu_syscalls(&spufs_calls);
463 unregister_filesystem(&spufs_type);
464 kmem_cache_destroy(spufs_inode_cache);
466 module_exit(spufs_exit);
468 MODULE_LICENSE("GPL");
469 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");