4.4-stable review patch. If anyone has any objections, please let me know.
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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 4.4: 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 @@ -2101,7 +2101,7 @@ 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); @@ -2110,6 +2110,7 @@ static void build_sit_entries(struct f2f unsigned int i, start, end; unsigned int readed, start_blk = 0; int nrpages = MAX_BIO_BLOCKS(sbi); + int err = 0;
do { readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT, true); @@ -2128,7 +2129,9 @@ 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 */ @@ -2154,7 +2157,9 @@ 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);
memcpy(se->discard_map, se->cur_valid_map, SIT_VBLOCK_MAP_SIZE); @@ -2165,6 +2170,7 @@ static void build_sit_entries(struct f2f se->valid_blocks - old_valid_blocks; } mutex_unlock(&curseg->curseg_mutex); + return err; }
static void init_free_segmap(struct f2fs_sb_info *sbi) @@ -2326,7 +2332,9 @@ 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 @@ -585,7 +585,7 @@ 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 @@ -607,11 +607,25 @@ 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,