truncate_setsize — update inode and pagecache for a new file size
void truncate_setsize (
struct inode * inode, loff_t newsize)
;
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.