static int ramfs_probe(struct device_d *dev)
{
struct ramfs_inode *n;
struct ramfs_priv *priv = xzalloc(sizeof(struct ramfs_priv));
dev->priv = priv;
priv->root.name = "/";
priv->root.mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
priv->root.parent = &priv->root;
n = ramfs_get_inode();
n->name = strdup(".");
n->mode = S_IFDIR;
n->parent = &priv->root;
n->child = n;
priv->root.child = n;
n = ramfs_get_inode();
n->name = strdup("..");
n->mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
n->parent = &priv->root;
n->child = priv->root.child;
priv->root.child->next = n;
return 0;
}
static struct ramfs_inode* node_insert(struct ramfs_inode *parent_node, const char *filename, ulong mode)
{
struct ramfs_inode *node, *new_node = ramfs_get_inode();
new_node->name = strdup(filename);
new_node->mode = mode;
node = parent_node->child;
if (S_ISDIR(mode)) {
struct ramfs_inode *n = ramfs_get_inode();
n->name = strdup(".");
n->mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
n->child = n;
n->parent = new_node;
new_node->child = n;
n = ramfs_get_inode();
n->name = strdup("..");
n->mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
n->parent = new_node;
n->child = parent_node->child;
new_node->child->next = n;
}
while (node->next)
node = node->next;
node->next = new_node;
return new_node;
}
int ramfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct ramfs_fs_info *fsi;
struct inode *inode;
int err;
save_mount_options(sb, data);
fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
sb->s_fs_info = fsi;
if (!fsi)
return -ENOMEM;
err = ramfs_parse_options(data, &fsi->mount_opts);
if (err)
return err;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = RAMFS_MAGIC;
sb->s_op = &ramfs_ops;
sb->s_time_gran = 1;
inode = ramfs_get_inode(sb, NULL, S_IFDIR | fsi->mount_opts.mode, 0);
sb->s_root = d_make_root(inode);
if (!sb->s_root)
return -ENOMEM;
return 0;
}
/*
* shmem_file_setup - get an unlinked file living in tmpfs
*
* @name: name for dentry (to be seen in /proc/<pid>/maps
* @size: size to be set for the file
*
*/
struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags)
{
int error;
struct file *file;
struct inode *inode;
struct dentry *dentry, *root;
struct qstr this;
if (IS_ERR(shm_mnt))
return (void *)shm_mnt;
error = -ENOMEM;
this.name = name;
this.len = strlen(name);
this.hash = 0; /* will go */
root = shm_mnt->mnt_root;
dentry = d_alloc(root, &this);
if (!dentry)
goto put_memory;
error = -ENFILE;
file = get_empty_filp();
if (!file)
goto put_dentry;
error = -ENOSPC;
inode = ramfs_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0);
if (!inode)
goto close_file;
d_instantiate(dentry, inode);
inode->i_nlink = 0; /* It is unlinked */
file->f_path.mnt = mntget(shm_mnt);
file->f_path.dentry = dentry;
file->f_mapping = inode->i_mapping;
file->f_op = &ramfs_file_operations;
file->f_mode = FMODE_WRITE | FMODE_READ;
/* notify everyone as to the change of file size */
error = do_truncate(dentry, size, 0, file);
if (error < 0)
goto close_file;
return file;
close_file:
put_filp(file);
put_dentry:
dput(dentry);
put_memory:
return ERR_PTR(error);
}
/* SMP-safe */
static int
ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
int error = -ENOSPC;
if (inode) {
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
error = 0;
dir->i_mtime = dir->i_ctime = current_time(dir);
}
return error;
}
static int
ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
int error = -ENOSPC;
if (inode) {
d_instantiate(dentry, inode);
dget(dentry); /* */
error = 0;
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
}
return error;
}
static int
ramfs_mknod(struct inode *dir,
struct dentry *dentry, int mode, int dev)
{
struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
int error = -ENOSPC;
if (inode) {
dentry->d_inode = inode;
atomic_set(&dentry->d_count,1);
error = 0;
}
return error;
}
static int ramfs_fill_super(struct super_block * sb, void * data, int silent)
{
struct ramfs_fs_info *fsi;
struct inode *inode = NULL;
struct dentry *root;
int err;
save_mount_options(sb, data);
fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
sb->s_fs_info = fsi;
if (!fsi) {
err = -ENOMEM;
goto fail;
}
err = ramfs_parse_options(data, &fsi->mount_opts);
if (err)
goto fail;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = RAMFS_MAGIC;
sb->s_op = &ramfs_ops;
sb->s_time_gran = 1;
inode = ramfs_get_inode(sb, S_IFDIR | fsi->mount_opts.mode, 0);
if (!inode) {
err = -ENOMEM;
goto fail;
}
root = d_alloc_root(inode);
sb->s_root = root;
if (!root) {
err = -ENOMEM;
goto fail;
}
return 0;
fail:
kfree(fsi);
sb->s_fs_info = NULL;
iput(inode);
return err;
}
static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
{
struct inode *inode;
int error = -ENOSPC;
inode = ramfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
if (inode) {
int l = strlen(symname)+1;
error = page_symlink(inode, symname, l);
if (!error) {
d_instantiate(dentry, inode);
dget(dentry);
dir->i_mtime = dir->i_ctime = current_time(dir);
} else
iput(inode);
}
return error;
}
/* SMP-safe */
static int
ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
int error = -ENOSPC;
if (inode) {
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
inode->i_mode |= S_ISGID;
}
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
error = 0;
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
}
return error;
}
static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
{
struct inode *inode;
int error = -ENOSPC;
inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
if (inode) {
int l = strlen(symname)+1;
error = page_symlink(inode, symname, l);
if (!error) {
if (dir->i_mode & S_ISGID)
inode->i_gid = dir->i_gid;
d_instantiate(dentry, inode);
dget(dentry);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
} else
iput(inode);
}
return error;
}
static int ramfs_fill_super(struct super_block * sb, void * data, int silent)
{
struct inode * inode;
struct dentry * root;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = RAMFS_MAGIC;
sb->s_op = &ramfs_ops;
sb->s_time_gran = 1;
inode = ramfs_get_inode(sb, S_IFDIR | 0755, 0);
if (!inode)
return -ENOMEM;
root = d_alloc_root(inode);
if (!root) {
iput(inode);
return -ENOMEM;
}
sb->s_root = root;
return 0;
}