--- /dev/null
+/*
+ * SPU file system
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * Author: Arnd Bergmann <arndb@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/backing-dev.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/pagemap.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/parser.h>
+
+#include <asm/io.h>
+#include <asm/semaphore.h>
+#include <asm/spu.h>
+#include <asm/uaccess.h>
+
+#include "spufs.h"
+
+static kmem_cache_t *spufs_inode_cache;
+
+static struct inode *
+spufs_alloc_inode(struct super_block *sb)
+{
+ struct spufs_inode_info *ei;
+
+ ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void
+spufs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
+}
+
+static void
+spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
+{
+ struct spufs_inode_info *ei = p;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ inode_init_once(&ei->vfs_inode);
+ }
+}
+
+static struct inode *
+spufs_new_inode(struct super_block *sb, int mode)
+{
+ struct inode *inode;
+
+ inode = new_inode(sb);
+ if (!inode)
+ goto out;
+
+ inode->i_mode = mode;
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_blksize = PAGE_CACHE_SIZE;
+ inode->i_blocks = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+out:
+ return inode;
+}
+
+static int
+spufs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ (attr->ia_size != inode->i_size))
+ return -EINVAL;
+ return inode_setattr(inode, attr);
+}
+
+
+static int
+spufs_new_file(struct super_block *sb, struct dentry *dentry,
+ const struct file_operations *fops, int mode,
+ struct spu_context *ctx)
+{
+ static struct inode_operations spufs_file_iops = {
+ .setattr = spufs_setattr,
+ };
+ struct inode *inode;
+ int ret;
+
+ ret = -ENOSPC;
+ inode = spufs_new_inode(sb, S_IFREG | mode);
+ if (!inode)
+ goto out;
+
+ ret = 0;
+ inode->i_op = &spufs_file_iops;
+ inode->i_fop = fops;
+ inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
+ d_add(dentry, inode);
+out:
+ return ret;
+}
+
+static void
+spufs_delete_inode(struct inode *inode)
+{
+ if (SPUFS_I(inode)->i_ctx)
+ put_spu_context(SPUFS_I(inode)->i_ctx);
+ clear_inode(inode);
+}
+
+static void spufs_prune_dir(struct dentry *dir)
+{
+ struct dentry *dentry, *tmp;
+ mutex_lock(&dir->d_inode->i_mutex);
+ list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
+ spin_lock(&dcache_lock);
+ spin_lock(&dentry->d_lock);
+ if (!(d_unhashed(dentry)) && dentry->d_inode) {
+ dget_locked(dentry);
+ __d_drop(dentry);
+ spin_unlock(&dentry->d_lock);
+ simple_unlink(dir->d_inode, dentry);
+ spin_unlock(&dcache_lock);
+ dput(dentry);
+ } else {
+ spin_unlock(&dentry->d_lock);
+ spin_unlock(&dcache_lock);
+ }
+ }
+ shrink_dcache_parent(dir);
+ mutex_unlock(&dir->d_inode->i_mutex);
+}
+
+static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
+{
+ struct spu_context *ctx;
+
+ /* remove all entries */
+ mutex_lock(&root->i_mutex);
+ spufs_prune_dir(dir_dentry);
+ mutex_unlock(&root->i_mutex);
+
+ /* We have to give up the mm_struct */
+ ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
+ spu_forget(ctx);
+
+ /* XXX Do we need to hold i_mutex here ? */
+ return simple_rmdir(root, dir_dentry);
+}
+
+static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
+ int mode, struct spu_context *ctx)
+{
+ struct dentry *dentry;
+ int ret;
+
+ while (files->name && files->name[0]) {
+ ret = -ENOMEM;
+ dentry = d_alloc_name(dir, files->name);
+ if (!dentry)
+ goto out;
+ ret = spufs_new_file(dir->d_sb, dentry, files->ops,
+ files->mode & mode, ctx);
+ if (ret)
+ goto out;
+ files++;
+ }
+ return 0;
+out:
+ spufs_prune_dir(dir);
+ return ret;
+}
+
+static int spufs_dir_close(struct inode *inode, struct file *file)
+{
+ struct inode *dir;
+ struct dentry *dentry;
+ int ret;
+
+ dentry = file->f_dentry;
+ dir = dentry->d_parent->d_inode;
+
+ ret = spufs_rmdir(dir, dentry);
+ WARN_ON(ret);
+
+ return dcache_dir_close(inode, file);
+}
+
+struct inode_operations spufs_dir_inode_operations = {
+ .lookup = simple_lookup,
+};
+
+struct file_operations spufs_context_fops = {
+ .open = dcache_dir_open,
+ .release = spufs_dir_close,
+ .llseek = dcache_dir_lseek,
+ .read = generic_read_dir,
+ .readdir = dcache_readdir,
+ .fsync = simple_sync_file,
+};
+
+static int
+spufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ int ret;
+ struct inode *inode;
+ struct spu_context *ctx;
+
+ ret = -ENOSPC;
+ inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
+ if (!inode)
+ goto out;
+
+ if (dir->i_mode & S_ISGID) {
+ inode->i_gid = dir->i_gid;
+ inode->i_mode &= S_ISGID;
+ }
+ ctx = alloc_spu_context();
+ SPUFS_I(inode)->i_ctx = ctx;
+ if (!ctx)
+ goto out_iput;
+
+ inode->i_op = &spufs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
+ if (ret)
+ goto out_free_ctx;
+
+ d_instantiate(dentry, inode);
+ dget(dentry);
+ dir->i_nlink++;
+ dentry->d_inode->i_nlink++;
+ goto out;
+
+out_free_ctx:
+ put_spu_context(ctx);
+out_iput:
+ iput(inode);
+out:
+ return ret;
+}
+
+static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
+{
+ int ret;
+ struct file *filp;
+
+ ret = get_unused_fd();
+ if (ret < 0) {
+ dput(dentry);
+ mntput(mnt);
+ goto out;
+ }
+
+ filp = dentry_open(dentry, mnt, O_RDONLY);
+ if (IS_ERR(filp)) {
+ put_unused_fd(ret);
+ ret = PTR_ERR(filp);
+ goto out;
+ }
+
+ filp->f_op = &spufs_context_fops;
+ fd_install(ret, filp);
+out:
+ return ret;
+}
+
+static struct file_system_type spufs_type;
+
+long spufs_create_thread(struct nameidata *nd,
+ unsigned int flags, mode_t mode)
+{
+ struct dentry *dentry;
+ int ret;
+
+ /* need to be at the root of spufs */
+ ret = -EINVAL;
+ if (nd->dentry->d_sb->s_type != &spufs_type ||
+ nd->dentry != nd->dentry->d_sb->s_root)
+ goto out;
+
+ dentry = lookup_create(nd, 1);
+ ret = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ goto out_dir;
+
+ ret = -EEXIST;
+ if (dentry->d_inode)
+ goto out_dput;
+
+ mode &= ~current->fs->umask;
+ ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
+ if (ret)
+ goto out_dput;
+
+ /*
+ * get references for dget and mntget, will be released
+ * in error path of *_open().
+ */
+ ret = spufs_context_open(dget(dentry), mntget(nd->mnt));
+ if (ret < 0)
+ spufs_rmdir(nd->dentry->d_inode, dentry);
+
+out_dput:
+ dput(dentry);
+out_dir:
+ mutex_unlock(&nd->dentry->d_inode->i_mutex);
+out:
+ return ret;
+}
+
+/* File system initialization */
+enum {
+ Opt_uid, Opt_gid, Opt_err,
+};
+
+static match_table_t spufs_tokens = {
+ { Opt_uid, "uid=%d" },
+ { Opt_gid, "gid=%d" },
+ { Opt_err, NULL },
+};
+
+static int
+spufs_parse_options(char *options, struct inode *root)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token, option;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, spufs_tokens, args);
+ switch (token) {
+ case Opt_uid:
+ if (match_int(&args[0], &option))
+ return 0;
+ root->i_uid = option;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return 0;
+ root->i_gid = option;
+ break;
+ default:
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+spufs_create_root(struct super_block *sb, void *data)
+{
+ struct inode *inode;
+ int ret;
+
+ ret = -ENOMEM;
+ inode = spufs_new_inode(sb, S_IFDIR | 0775);
+ if (!inode)
+ goto out;
+
+ inode->i_op = &spufs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ SPUFS_I(inode)->i_ctx = NULL;
+
+ ret = -EINVAL;
+ if (!spufs_parse_options(data, inode))
+ goto out_iput;
+
+ ret = -ENOMEM;
+ sb->s_root = d_alloc_root(inode);
+ if (!sb->s_root)
+ goto out_iput;
+
+ return 0;
+out_iput:
+ iput(inode);
+out:
+ return ret;
+}
+
+static int
+spufs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ static struct super_operations s_ops = {
+ .alloc_inode = spufs_alloc_inode,
+ .destroy_inode = spufs_destroy_inode,
+ .statfs = simple_statfs,
+ .delete_inode = spufs_delete_inode,
+ .drop_inode = generic_delete_inode,
+ };
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = SPUFS_MAGIC;
+ sb->s_op = &s_ops;
+
+ return spufs_create_root(sb, data);
+}
+
+static struct super_block *
+spufs_get_sb(struct file_system_type *fstype, int flags,
+ const char *name, void *data)
+{
+ return get_sb_single(fstype, flags, data, spufs_fill_super);
+}
+
+static struct file_system_type spufs_type = {
+ .owner = THIS_MODULE,
+ .name = "spufs",
+ .get_sb = spufs_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+static int __init spufs_init(void)
+{
+ int ret;
+ ret = -ENOMEM;
+ spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
+ sizeof(struct spufs_inode_info), 0,
+ SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
+
+ if (!spufs_inode_cache)
+ goto out;
+ if (spu_sched_init() != 0) {
+ kmem_cache_destroy(spufs_inode_cache);
+ goto out;
+ }
+ ret = register_filesystem(&spufs_type);
+ if (ret)
+ goto out_cache;
+ ret = register_spu_syscalls(&spufs_calls);
+ if (ret)
+ goto out_fs;
+ return 0;
+out_fs:
+ unregister_filesystem(&spufs_type);
+out_cache:
+ kmem_cache_destroy(spufs_inode_cache);
+out:
+ return ret;
+}
+module_init(spufs_init);
+
+static void __exit spufs_exit(void)
+{
+ spu_sched_exit();
+ unregister_spu_syscalls(&spufs_calls);
+ unregister_filesystem(&spufs_type);
+ kmem_cache_destroy(spufs_inode_cache);
+}
+module_exit(spufs_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
+
git://git.onelab.eu / linux-2.6.git / blobdiff