blob: b3962c3a03480ca16a36dcdb98c44cf4dc6839ad [file] [log] [blame]
/*
* 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,
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(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++;
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 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>");