f2fs: compress: fix potential deadlock of compress file

There is a potential deadlock between writeback process and a process
performing write_begin() or write_cache_pages() while trying to write
same compress file, but not compressable, as below:

[Process A] - doing checkpoint
[Process B]                     [Process C]
f2fs_write_cache_pages()
- lock_page() [all pages in cluster, 0-31]
- f2fs_write_multi_pages()
 - f2fs_write_raw_pages()
  - f2fs_write_single_data_page()
   - f2fs_do_write_data_page()
     - return -EAGAIN [f2fs_trylock_op() failed]
   - unlock_page(page) [e.g., page 0]
                                - generic_perform_write()
                                 - f2fs_write_begin()
                                  - f2fs_prepare_compress_overwrite()
                                   - prepare_compress_overwrite()
                                    - lock_page() [e.g., page 0]
                                    - lock_page() [e.g., page 1]
   - lock_page(page) [e.g., page 0]

Since there is no compress process, it is no longer necessary to hold
locks on every pages in cluster within f2fs_write_raw_pages().

This patch changes f2fs_write_raw_pages() to release all locks first
and then perform write same as the non-compress file in
f2fs_write_cache_pages().

Fixes: 4c8ff70 ("f2fs: support data compression")
Signed-off-by: Hyeong-Jun Kim <[email protected]>
Signed-off-by: Sungjong Seo <[email protected]>
Signed-off-by: Youngjin Gil <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>

Author: Hyeong-Jun Kim

fs/f2fs/compress.c

@@ -1456,25 +1456,38 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
 					enum iostat_type io_type)
 {
 	struct address_space *mapping = cc->inode->i_mapping;
-	int _submitted, compr_blocks, ret;
-	int i = -1, err = 0;
+	int _submitted, compr_blocks, ret, i;
 
 	compr_blocks = f2fs_compressed_blocks(cc);
-	if (compr_blocks < 0) {
-		err = compr_blocks;
-		goto out_err;
+
+	for (i = 0; i < cc->cluster_size; i++) {
+		if (!cc->rpages[i])
+			continue;
+
+		redirty_page_for_writepage(wbc, cc->rpages[i]);
+		unlock_page(cc->rpages[i]);
 	}
 
+	if (compr_blocks < 0)
+		return compr_blocks;
+
 	for (i = 0; i < cc->cluster_size; i++) {
 		if (!cc->rpages[i])
 			continue;
 retry_write:
+		lock_page(cc->rpages[i]);
+
 		if (cc->rpages[i]->mapping != mapping) {
+continue_unlock:
 			unlock_page(cc->rpages[i]);
 			continue;
 		}
 
-		BUG_ON(!PageLocked(cc->rpages[i]));
+		if (!PageDirty(cc->rpages[i]))
+			goto continue_unlock;
+
+		if (!clear_page_dirty_for_io(cc->rpages[i]))
+			goto continue_unlock;
 
 		ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
 						NULL, NULL, wbc, io_type,
@@ -1489,26 +1502,15 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
 				 * avoid deadlock caused by cluster update race
 				 * from foreground operation.
 				 */
-				if (IS_NOQUOTA(cc->inode)) {
-					err = 0;
-					goto out_err;
-				}
+				if (IS_NOQUOTA(cc->inode))
+					return 0;
 				ret = 0;
 				cond_resched();
 				congestion_wait(BLK_RW_ASYNC,
 						DEFAULT_IO_TIMEOUT);
-				lock_page(cc->rpages[i]);
-
-				if (!PageDirty(cc->rpages[i])) {
-					unlock_page(cc->rpages[i]);
-					continue;
-				}
-
-				clear_page_dirty_for_io(cc->rpages[i]);
 				goto retry_write;
 			}
-			err = ret;
-			goto out_err;
+			return ret;
 		}
 
 		*submitted += _submitted;
@@ -1517,14 +1519,6 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
 	f2fs_balance_fs(F2FS_M_SB(mapping), true);
 
 	return 0;
-out_err:
-	for (++i; i < cc->cluster_size; i++) {
-		if (!cc->rpages[i])
-			continue;
-		redirty_page_for_writepage(wbc, cc->rpages[i]);
-		unlock_page(cc->rpages[i]);
-	}
-	return err;
 }
 
 int f2fs_write_multi_pages(struct compress_ctx *cc,