static void gfs2_invalidatepage(struct page *page, unsigned int offset, unsigned int length) { struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); unsigned int stop = offset + length; int partial_page = (offset || length < PAGE_CACHE_SIZE); struct buffer_head *bh, *head; unsigned long pos = 0; BUG_ON(!PageLocked(page)); if (!partial_page) ClearPageChecked(page); if (!page_has_buffers(page)) goto out; bh = head = page_buffers(page); do { if (pos + bh->b_size > stop) return; if (offset <= pos) gfs2_discard(sdp, bh); pos += bh->b_size; bh = bh->b_this_page; } while (bh != head); out: if (!partial_page) try_to_release_page(page, 0); }
static void gfs2_invalidatepage(struct page *page, unsigned long offset) { struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); struct buffer_head *bh, *head; unsigned long pos = 0; BUG_ON(!PageLocked(page)); if (offset == 0) ClearPageChecked(page); if (!page_has_buffers(page)) goto out; bh = head = page_buffers(page); do { if (offset <= pos) gfs2_discard(sdp, bh); pos += bh->b_size; bh = bh->b_this_page; } while (bh != head); out: if (offset == 0) try_to_release_page(page, 0); }