BLOCK_INVALIDATEPAGE(9) The Linux VFS BLOCK_INVALIDATEPAGE(9)
NAME block_invalidatepage - invalidate part of all of a buffer-backed page
SYNOPSIS void block_invalidatepage(struct page * page, unsigned long offset);
ARGUMENTS page the page which is affected
offset the index of the truncation point
DESCRIPTION block_invalidatepage is called when all or part of the page has become invalidatedby 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.
COPYRIGHT Kernel Hackers Manual 2.6. July 2015 BLOCK_INVALIDATEPAGE(9)