Update inode and pagecache for a new file size
void truncate_setsize(struct inode * inode, loff_t newsize);
inode
inode
newsize
new file size
truncate_setsize updates i_size and performs pagecache truncation (if necessary) to newsize. It will be typically be called from the filesystem's setattr function when ATTR_SIZE is passed in.
Must be called with inode_mutex held and before all filesystem specific block truncation has been performed.