f2fs: clear PageError on the read path

When running fault injection test, I hit somewhat wrong behavior in f2fs_gc ->
gc_data_segment():

0. fault injection generated some PageError'ed pages

1. gc_data_segment
 -> f2fs_get_read_data_page(REQ_RAHEAD)

2. move_data_page
 -> f2fs_get_lock_data_page()
  -> f2f_get_read_data_page()
   -> f2fs_submit_page_read()
    -> submit_bio(READ)
  -> return EIO due to PageError
  -> fail to move data

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 02d5ce8..873f9ea 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -77,7 +77,8 @@ static void __read_end_io(struct bio *bio)
                /* PG_error was set if any post_read step failed */
                if (bio->bi_status || PageError(page)) {
                        ClearPageUptodate(page);
-                       SetPageError(page);
+                       /* will re-read again later */
+                       ClearPageError(page);
                } else {
                        SetPageUptodate(page);
                }
@@ -591,6 +592,7 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page,
                bio_put(bio);
                return -EFAULT;
        }
+       ClearPageError(page);
        __submit_bio(F2FS_I_SB(inode), bio, DATA);
        return 0;
 }
@@ -1579,6 +1581,7 @@ submit_and_realloc:
                if (bio_add_page(bio, page, blocksize, 0) < blocksize)
                        goto submit_and_realloc;
 
+               ClearPageError(page);
                last_block_in_bio = block_nr;
                goto next_page;
 set_error_page: