Everybody else does this, we need to do it too. If we're syncing, we need to
tag the pages we're going to write for writeback so we don't end up writing the
same stuff over and over again if somebody is constantly redirtying our file.
This will keep us from having latencies with heavy sync workloads. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
pgoff_t index;
pgoff_t end; /* Inclusive */
int scanned = 0;
pgoff_t index;
pgoff_t end; /* Inclusive */
int scanned = 0;
pagevec_init(&pvec, 0);
if (wbc->range_cyclic) {
pagevec_init(&pvec, 0);
if (wbc->range_cyclic) {
end = wbc->range_end >> PAGE_CACHE_SHIFT;
scanned = 1;
}
end = wbc->range_end >> PAGE_CACHE_SHIFT;
scanned = 1;
}
+ if (wbc->sync_mode == WB_SYNC_ALL)
+ tag = PAGECACHE_TAG_TOWRITE;
+ else
+ tag = PAGECACHE_TAG_DIRTY;
+ if (wbc->sync_mode == WB_SYNC_ALL)
+ tag_pages_for_writeback(mapping, index, end);
while (!done && !nr_to_write_done && (index <= end) &&
while (!done && !nr_to_write_done && (index <= end) &&
- (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
- PAGECACHE_TAG_DIRTY, min(end - index,
- (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
+ (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {