@@ -3204,14 +3204,10 @@ int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
return ret;
}
-static noinline void update_nr_written(struct page *page,
- struct writeback_control *wbc,
- unsigned long nr_written)
+static void update_nr_written(struct page *page, struct writeback_control *wbc,
+ unsigned long nr_written)
{
wbc->nr_to_write -= nr_written;
- if (wbc->range_cyclic || (wbc->nr_to_write > 0 &&
- wbc->range_start == 0 && wbc->range_end == LLONG_MAX))
- page->mapping->writeback_index = page->index + nr_written;
}
/*
@@ -3932,6 +3928,8 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
int nr_pages;
pgoff_t index;
pgoff_t end; /* Inclusive */
+ pgoff_t done_index;
+ int range_whole = 0;
int scanned = 0;
int tag;
@@ -3954,6 +3952,8 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
} else {
index = wbc->range_start >> PAGE_CACHE_SHIFT;
end = wbc->range_end >> PAGE_CACHE_SHIFT;
+ if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+ range_whole = 1;
scanned = 1;
}
if (wbc->sync_mode == WB_SYNC_ALL)
@@ -3963,6 +3963,7 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
retry:
if (wbc->sync_mode == WB_SYNC_ALL)
tag_pages_for_writeback(mapping, index, end);
+ done_index = index;
while (!done && !nr_to_write_done && (index <= end) &&
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
@@ -3972,6 +3973,7 @@ retry:
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
+ done_index = page->index;
/*
* At this point we hold neither mapping->tree_lock nor
* lock on the page itself: the page may be truncated or
@@ -4015,6 +4017,20 @@ retry:
}
if (!err && ret < 0)
err = ret;
+ if (ret < 0) {
+ /*
+ * done_index is set past this page,
+ * so media errors will not choke
+ * background writeout for the entire
+ * file. This has consequences for
+ * range_cyclic semantics (ie. it may
+ * not be suitable for data integrity
+ * writeout).
+ */
+ done_index = page->index + 1;
+ done = 1;
+ break;
+ }
/*
* the filesystem may choose to bump up nr_to_write.
@@ -4035,6 +4051,10 @@ retry:
index = 0;
goto retry;
}
+
+ if (wbc->range_cyclic || (wbc->nr_to_write > 0 && range_whole))
+ mapping->writeback_index = done_index;
+
btrfs_add_delayed_iput(inode);
return err;
}
If sequential writer is writing in the middle of the page and it just redirties the last written page by continuing from it. In the above case this can end up with seeking back to that firstly redirtied page after writing all the pages at the end of file because btrfs updates mapping->writeback_index to 1 past the current one. For non-cow filesystems, the cost is only about extra seek, while for cow filesystems such as btrfs, it means unnecessary fragments. To avoid it, we just need to continue writeback from the last written page. This also updates btrfs to behave like what write_cache_pages() does, ie, bail out immediately if there is an error in writepage(). <Ref: https://www.spinics.net/lists/linux-btrfs/msg52628.html> Reported-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> --- fs/btrfs/extent_io.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-)