[PATCH 4.18 154/350] f2fs: clear PageError on the read path

Greg Kroah-Hartman
2018-11-11T23:31:25Z

From: Jaegeuk Kim <jaegeuk@kernel.org>

[ Upstream commit fb7d70db305a1446864227abf711b756568f8242 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/f2fs/data.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -80,7 +80,8 @@ static void __read_end_io(struct bio *bi
/* 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);
}
@@ -584,6 +585,7 @@ static int f2fs_submit_page_read(struct
bio_put(bio);
return -EFAULT;
}
+ ClearPageError(page);
__submit_bio(F2FS_I_SB(inode), bio, DATA);
return 0;
}
@@ -1528,6 +1530,7 @@ 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;