/**
* relayfs destroy_inode() implementation
*/
static void relayfs_destroy_inode(struct inode *inode)
{
if (RELAYFS_I(inode)->buf)
relay_destroy_buf(RELAYFS_I(inode)->buf);
kmem_cache_free(relayfs_inode_cachep, RELAYFS_I(inode));
}
static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
struct rchan *chan)
{
struct rchan_buf *buf = NULL;
struct inode *inode;
if (S_ISREG(mode)) {
BUG_ON(!chan);
buf = relay_create_buf(chan);
if (!buf)
return NULL;
}
inode = new_inode(sb);
if (!inode) {
relay_destroy_buf(buf);
return NULL;
}
inode->i_mode = mode;
inode->i_uid = 0;
inode->i_gid = 0;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_mapping->backing_dev_info = &relayfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
case S_IFREG:
inode->i_fop = &relayfs_file_operations;
RELAYFS_I(inode)->buf = buf;
break;
case S_IFDIR:
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inode->i_nlink++;
break;
default:
break;
}
return inode;
}
/**
* relay_remove_buf - remove a channel buffer
*
* Removes the file from the fileystem, which also frees the
* rchan_buf_struct and the channel buffer. Should only be called from
* kref_put().
*/
void relay_remove_buf(struct kref *kref)
{
struct rchan_buf *buf = container_of(kref, struct rchan_buf, kref);
buf->chan->cb->remove_buf_file(buf->dentry);
relay_destroy_buf(buf);
}
