[PATCH 2/2] f2fs: avoid f2fs_bug_on if f2fs_get_meta_page_nofail got EIO

From: Jaegeuk Kim
Date: Mon Sep 17 2018 - 22:18:12 EST


This patch avoids BUG_ON when f2fs_get_meta_page_nofail got EIO during
xfstests/generic/475.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/checkpoint.c | 2 +-
fs/f2fs/gc.c | 2 ++
fs/f2fs/node.c | 12 ++++++++++--
fs/f2fs/recovery.c | 2 ++
fs/f2fs/segment.c | 3 +++
5 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 01e0d8f5bbbe..6ce3cb6502dd 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -121,7 +121,7 @@ struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index)
goto retry;

f2fs_stop_checkpoint(sbi, false);
- f2fs_bug_on(sbi, 1);
+ return NULL;
}

return page;
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 4bcc8a59fdef..d049865887cf 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1070,6 +1070,8 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
/* reference all summary page */
while (segno < end_segno) {
sum_page = f2fs_get_sum_page(sbi, segno++);
+ if (!sum_page)
+ return -EIO;
unlock_page(sum_page);
}

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index fa2381c0bc47..b3595522c35b 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -126,6 +126,8 @@ static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)

/* get current nat block page with lock */
src_page = get_current_nat_page(sbi, nid);
+ if (!src_page)
+ return NULL;
dst_page = f2fs_grab_meta_page(sbi, dst_off);
f2fs_bug_on(sbi, PageDirty(src_page));

@@ -2265,8 +2267,12 @@ static int __f2fs_build_free_nids(struct f2fs_sb_info *sbi,
nm_i->nat_block_bitmap)) {
struct page *page = get_current_nat_page(sbi, nid);

- ret = scan_nat_page(sbi, page, nid);
- f2fs_put_page(page, 1);
+ if (page) {
+ ret = scan_nat_page(sbi, page, nid);
+ f2fs_put_page(page, 1);
+ } else {
+ ret = -EIO;
+ }

if (ret) {
up_read(&nm_i->nat_tree_lock);
@@ -2724,6 +2730,8 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
down_write(&curseg->journal_rwsem);
} else {
page = get_next_nat_page(sbi, start_nid);
+ if (!page)
+ return;
nat_blk = page_address(page);
f2fs_bug_on(sbi, !nat_blk);
}
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 56d34193a74b..a3dce16bfd6c 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -355,6 +355,8 @@ static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
}

sum_page = f2fs_get_sum_page(sbi, segno);
+ if (!sum_page)
+ return -EIO;
sum_node = (struct f2fs_summary_block *)page_address(sum_page);
sum = sum_node->entries[blkoff];
f2fs_put_page(sum_page, 1);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index aa96a371aaf8..cfc9eb492da1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2487,6 +2487,7 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type)
__next_free_blkoff(sbi, curseg, 0);

sum_page = f2fs_get_sum_page(sbi, new_segno);
+ f2fs_bug_on(sbi, !sum_page);
sum_node = (struct f2fs_summary_block *)page_address(sum_page);
memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
f2fs_put_page(sum_page, 1);
@@ -3971,6 +3972,8 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)

se = &sit_i->sentries[start];
page = get_current_sit_page(sbi, start);
+ if (!page)
+ return err;
sit_blk = (struct f2fs_sit_block *)page_address(page);
sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
f2fs_put_page(page, 1);
--
2.17.0.441.gb46fe60e1d-goog