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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-01-24 19:56:11 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-02-12 07:15:00 +0900
commit577e349514452fa3fcd99fd06e587b02d3d1cf28 (patch)
treefe4e86d3f56b8050c85b1f5fb76117d6e99c5aa9 /fs/f2fs/segment.c
parent7d79e75f6420fc13cfe72554b3ea5afad24c8625 (diff)
f2fs: prevent checkpoint once any IO failure is detected
This patch enhances the checkpoint routine to cope with IO errors. Basically f2fs detects IO errors from end_io_write, and the errors are able to be occurred during one of data, node, and meta page writes. In the previous code, when an IO error is occurred during writes, f2fs sets a flag, CP_ERROR_FLAG, in the raw ckeckpoint buffer which will be written to disk. Afterwards, write_checkpoint() will check the flag and remount f2fs as a read-only (ro) mode. However, even once f2fs is remounted as a ro mode, dirty checkpoint pages are freely able to be written to disk by flusher or kswapd in background. In such a case, after cold reboot, f2fs would restore the checkpoint data having CP_ERROR_FLAG, resulting in disabling write_checkpoint and remounting f2fs as a ro mode again. Therefore, let's prevent any checkpoint page (meta) writes once an IO error is occurred, and remount f2fs as a ro mode right away at that moment. Reported-by: Oliver Winker <oliver@oli1170.net> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com> Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Diffstat (limited to 'fs/f2fs/segment.c')
-rw-r--r--fs/f2fs/segment.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 4b0099066582..7aa270f3538a 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -600,6 +600,7 @@ static void f2fs_end_io_write(struct bio *bio, int err)
if (page->mapping)
set_bit(AS_EIO, &page->mapping->flags);
set_ckpt_flags(p->sbi->ckpt, CP_ERROR_FLAG);
+ p->sbi->sb->s_flags |= MS_RDONLY;
}
end_page_writeback(page);
dec_page_count(p->sbi, F2FS_WRITEBACK);
@@ -815,15 +816,10 @@ static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
mutex_unlock(&curseg->curseg_mutex);
}
-int write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
- struct writeback_control *wbc)
+void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
{
- if (wbc->for_reclaim)
- return AOP_WRITEPAGE_ACTIVATE;
-
set_page_writeback(page);
submit_write_page(sbi, page, page->index, META);
- return 0;
}
void write_node_page(struct f2fs_sb_info *sbi, struct page *page,