static void gfs2_invalidatepage(struct page *page, unsigned long offset)
{
struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
struct buffer_head *head, *bh, *next;
unsigned int curr_off = 0;
BUG_ON(!PageLocked(page));
if (!page_has_buffers(page))
return;
bh = head = page_buffers(page);
do {
unsigned int next_off = curr_off + bh->b_size;
next = bh->b_this_page;
if (offset <= curr_off)
discard_buffer(sdp, bh);
curr_off = next_off;
bh = next;
} while (bh != head);
if (!offset)
try_to_release_page(page, 0);
return;
}
bool stream_reader::get_page(page& spage) throw(std::exception)
{
size_t advance;
bool f;
try_again:
fill_buffer();
if(eof && !left)
return false;
f = page::scan(buffer, left, eof, advance);
if(advance) {
//The ogg stream resyncs.
(*errors_to) << "Warning: Ogg stream: Recapture after " << advance << " bytes." << std::endl;
discard_buffer(advance);
goto try_again;
}
if(!f)
goto try_again;
spage = page(buffer, advance);
last_offset = start_offset;
discard_buffer(advance);
return true;
}
/*
* Invalidate buffer, this must be called from frontend like truncate.
* Caller must hold lock_page(), and page->mapping must be valid.
*/
void tux3_invalidate_buffer(struct buffer_head *buffer)
{
unsigned delta = tux3_inode_delta(buffer_inode(buffer));
tux3_clear_buffer_dirty(buffer, delta);
discard_buffer(buffer);
}
