f2fs: fix retry logic in f2fs_write_cache_pages() (e78790f8) · Commits · 戴 / test

In case a compressed file is getting overwritten, the current retry logic doesn't include the current page to be retried now as it sets the new start index as 0 and new end index as writeback_index - 1. This causes the corresponding cluster to be uncompressed and written as normal pages without compression. Fix this by allowing writeback to be retried for the current page as well (in case of compressed page getting retried due to index mismatch with cluster index). So that this cluster can be written compressed in case of overwrite. Also, align f2fs_write_cache_pages() according to the change - <>("mm/page-writeback.c: fix range_cyclic writeback vs writepages deadlock"). Signed-off-by:

Sahitya Tummala <stummala@codeaurora.org> Reviewed-by:

Chao Yu <yuchao0@huawei.com> Signed-off-by:

Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

+4 −9

Original line number	Diff line number	Diff line
		@@ -2861,7 +2861,6 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
		pgoff_t index;
		pgoff_t end; /* Inclusive */
		pgoff_t done_index;
		int cycled;
		int range_whole = 0;
		xa_mark_t tag;
		int nwritten = 0;
		@@ -2879,17 +2878,12 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
		if (wbc->range_cyclic) {
		writeback_index = mapping->writeback_index; /* prev offset */
		index = writeback_index;
		if (index == 0)
		cycled = 1;
		else
		cycled = 0;
		end = -1;
		} else {
		index = wbc->range_start >> PAGE_SHIFT;
		end = wbc->range_end >> PAGE_SHIFT;
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
		range_whole = 1;
		cycled = 1; /* ignore range_cyclic tests */
		}
		if (wbc->sync_mode == WB_SYNC_ALL \|\| wbc->tagged_writepages)
		tag = PAGECACHE_TAG_TOWRITE;
		@@ -3054,12 +3048,13 @@ next:
		}
		}
		#endif
		if ((!cycled && !done) \|\| retry) {
		cycled = 1;
		if (retry) {
		index = 0;
		end = writeback_index - 1;
		end = -1;
		goto retry;
		}
		if (wbc->range_cyclic && !done)
		done_index = 0;
		if (wbc->range_cyclic \|\| (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = done_index;

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