block_invalidatepage - invalidate part or all of a buffer-backed page
2. SYNOPSIS ▲
void block_invalidatepage(struct page * page , unsigned long offset );
3. ARGUMENTS ▲
the page which is affected
the index of the truncation point
4. DESCRIPTION ▲
block_invalidatepage is called when all or part of the page has become invalidated by a truncate operation.
block_invalidatepage does not have to release all buffers, but it must ensure that no dirty buffer is left outside offset and that no I/O is underway against any of the blocks which are outside the truncation point. Because the caller is about to free (and possibly reuse) those blocks on-disk.
5. COPYRIGHT ▲