| /* |
| * 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/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, |
| 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 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: |
| // FIXME: remove all files that are left |
| |
| return ret; |
| } |
| |
| static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry) |
| { |
| struct dentry *dentry, *tmp; |
| struct spu_context *ctx; |
| |
| /* remove all entries */ |
| down(&root->i_sem); |
| down(&dir_dentry->d_inode->i_sem); |
| list_for_each_entry_safe(dentry, tmp, &dir_dentry->d_subdirs, 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_dentry->d_inode, dentry); |
| spin_unlock(&dcache_lock); |
| dput(dentry); |
| } else { |
| spin_unlock(&dentry->d_lock); |
| spin_unlock(&dcache_lock); |
| } |
| } |
| shrink_dcache_parent(dir_dentry); |
| up(&dir_dentry->d_inode->i_sem); |
| up(&root->i_sem); |
| |
| /* 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_sem here ? */ |
| return simple_rmdir(root, dir_dentry); |
| } |
| |
| 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(inode->i_mapping); |
| 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++; |
| goto out; |
| |
| out_free_ctx: |
| put_spu_context(ctx); |
| out_iput: |
| iput(inode); |
| out: |
| return ret; |
| } |
| |
| long |
| spufs_create_thread(struct nameidata *nd, const char *name, |
| unsigned int flags, mode_t mode) |
| { |
| struct dentry *dentry; |
| struct file *filp; |
| int ret; |
| |
| /* need to be at the root of spufs */ |
| ret = -EINVAL; |
| if (nd->dentry->d_sb->s_magic != SPUFS_MAGIC || |
| 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; |
| |
| ret = get_unused_fd(); |
| if (ret < 0) |
| goto out_dput; |
| |
| dentry->d_inode->i_nlink++; |
| |
| filp = filp_open(name, O_RDONLY, mode); |
| if (IS_ERR(filp)) { |
| // FIXME: remove directory again |
| put_unused_fd(ret); |
| ret = PTR_ERR(filp); |
| } else { |
| filp->f_op = &spufs_context_fops; |
| fd_install(ret, filp); |
| } |
| |
| out_dput: |
| dput(dentry); |
| out_dir: |
| up(&nd->dentry->d_inode->i_sem); |
| 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 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 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>"); |
| |