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Subject[PATCH 4.9 086/101] f2fs: return error during fill_super
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jaegeuk Kim <jaegeuk@kernel.org>

commit c39a1b348c4fe172729eff77c533dabc3c7cdaa7 upstream.

Let's avoid BUG_ON during fill_super, when on-disk was totall corrupted.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/f2fs/segment.c | 16 ++++++++++++----
fs/f2fs/segment.h | 22 ++++++++++++++++++----
2 files changed, 30 insertions(+), 8 deletions(-)

--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2322,7 +2322,7 @@ static int build_curseg(struct f2fs_sb_i
return restore_curseg_summaries(sbi);
}

-static void build_sit_entries(struct f2fs_sb_info *sbi)
+static int build_sit_entries(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
@@ -2333,6 +2333,7 @@ static void build_sit_entries(struct f2f
unsigned int i, start, end;
unsigned int readed, start_blk = 0;
int nrpages = MAX_BIO_BLOCKS(sbi) * 8;
+ int err = 0;

do {
readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT, true);
@@ -2350,7 +2351,9 @@ static void build_sit_entries(struct f2f
sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
f2fs_put_page(page, 1);

- check_block_count(sbi, start, &sit);
+ err = check_block_count(sbi, start, &sit);
+ if (err)
+ return err;
seg_info_from_raw_sit(se, &sit);

/* build discard map only one time */
@@ -2378,7 +2381,9 @@ static void build_sit_entries(struct f2f

old_valid_blocks = se->valid_blocks;

- check_block_count(sbi, start, &sit);
+ err = check_block_count(sbi, start, &sit);
+ if (err)
+ break;
seg_info_from_raw_sit(se, &sit);

if (f2fs_discard_en(sbi)) {
@@ -2393,6 +2398,7 @@ static void build_sit_entries(struct f2f
se->valid_blocks - old_valid_blocks;
}
up_read(&curseg->journal_rwsem);
+ return err;
}

static void init_free_segmap(struct f2fs_sb_info *sbi)
@@ -2559,7 +2565,9 @@ int build_segment_manager(struct f2fs_sb
return err;

/* reinit free segmap based on SIT */
- build_sit_entries(sbi);
+ err = build_sit_entries(sbi);
+ if (err)
+ return err;

init_free_segmap(sbi);
err = build_dirty_segmap(sbi);
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -600,7 +600,7 @@ static inline void verify_block_addr(str
/*
* Summary block is always treated as an invalid block
*/
-static inline void check_block_count(struct f2fs_sb_info *sbi,
+static inline int check_block_count(struct f2fs_sb_info *sbi,
int segno, struct f2fs_sit_entry *raw_sit)
{
#ifdef CONFIG_F2FS_CHECK_FS
@@ -622,11 +622,25 @@ static inline void check_block_count(str
cur_pos = next_pos;
is_valid = !is_valid;
} while (cur_pos < sbi->blocks_per_seg);
- BUG_ON(GET_SIT_VBLOCKS(raw_sit) != valid_blocks);
+
+ if (unlikely(GET_SIT_VBLOCKS(raw_sit) != valid_blocks)) {
+ f2fs_msg(sbi->sb, KERN_ERR,
+ "Mismatch valid blocks %d vs. %d",
+ GET_SIT_VBLOCKS(raw_sit), valid_blocks);
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ return -EINVAL;
+ }
#endif
/* check segment usage, and check boundary of a given segment number */
- f2fs_bug_on(sbi, GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg
- || segno > TOTAL_SEGS(sbi) - 1);
+ if (unlikely(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg
+ || segno > TOTAL_SEGS(sbi) - 1)) {
+ f2fs_msg(sbi->sb, KERN_ERR,
+ "Wrong valid blocks %d or segno %u",
+ GET_SIT_VBLOCKS(raw_sit), segno);
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ return -EINVAL;
+ }
+ return 0;
}

static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,

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