This original patch was from Weichao Guo. We may encounter both checkpoints invalid in such a case: 1. kernel writes CP A; 2. power-cut when kernel writes CP B, then CP B is corrupted; 3. fsck: load CP A, fix meta/data; 4. power-cut when fsck writes CP A in-place, then CP A is corrupted too;
To avoid both checkpoints being invalid, this patch changes to enables fsck to write checkpoint with out-place-update method first, and then write checkpoint in original place. This can make sure during fsck repairing, even there is sudden power-cut, filesystem will still have at least one valid checkpoint. Signed-off-by: Weichao Guo <[email protected]> Signed-off-by: Chao Yu <[email protected]> --- v2: - clean up codes - cover flush_journal_entries() case - update commet message fsck/fsck.c | 17 +++++++++++++++-- fsck/fsck.h | 1 + fsck/mount.c | 15 ++++++++++++++- 3 files changed, 30 insertions(+), 3 deletions(-) diff --git a/fsck/fsck.c b/fsck/fsck.c index 6f0f262..6aed51d 100644 --- a/fsck/fsck.c +++ b/fsck/fsck.c @@ -2121,6 +2121,19 @@ static void fix_checkpoint(struct f2fs_sb_info *sbi) write_nat_bits(sbi, sb, cp, sbi->cur_cp); } +static void fix_checkpoints(struct f2fs_sb_info *sbi) +{ + int i, ret; + + for (i = 0; i < 2; i++) { + /* write checkpoint out of place first */ + sbi->cur_cp = sbi->cur_cp % 2 + 1; + fix_checkpoint(sbi); + ret = f2fs_fsync_device(); + ASSERT(ret >= 0); + } +} + int check_curseg_offset(struct f2fs_sb_info *sbi, int type) { struct curseg_info *curseg = CURSEG_I(sbi, type); @@ -2771,10 +2784,10 @@ int fsck_verify(struct f2fs_sb_info *sbi) rewrite_sit_area_bitmap(sbi); fix_curseg_info(sbi); fix_checksum(sbi); - fix_checkpoint(sbi); + fix_checkpoints(sbi); } else if (is_set_ckpt_flags(cp, CP_FSCK_FLAG) || is_set_ckpt_flags(cp, CP_QUOTA_NEED_FSCK_FLAG)) { - write_checkpoint(sbi); + write_checkpoints(sbi); } } return ret; diff --git a/fsck/fsck.h b/fsck/fsck.h index d38e8de..8fe5db1 100644 --- a/fsck/fsck.h +++ b/fsck/fsck.h @@ -192,6 +192,7 @@ extern void move_curseg_info(struct f2fs_sb_info *, u64, int); extern void write_curseg_info(struct f2fs_sb_info *); extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int); extern void write_checkpoint(struct f2fs_sb_info *); +extern void write_checkpoints(struct f2fs_sb_info *); extern void update_superblock(struct f2fs_super_block *, int); extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t); extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t); diff --git a/fsck/mount.c b/fsck/mount.c index 1c5cd93..bbb1af7 100644 --- a/fsck/mount.c +++ b/fsck/mount.c @@ -2127,7 +2127,7 @@ void flush_journal_entries(struct f2fs_sb_info *sbi) int n_sits = flush_sit_journal_entries(sbi); if (n_nats || n_sits) - write_checkpoint(sbi); + write_checkpoints(sbi); } void flush_sit_entries(struct f2fs_sb_info *sbi) @@ -2452,6 +2452,19 @@ void write_checkpoint(struct f2fs_sb_info *sbi) ASSERT(ret >= 0); } +void write_checkpoints(struct f2fs_sb_info *sbi) +{ + int i, ret; + + for (i = 0; i < 2; i++) { + /* write checkpoint out of place first */ + sbi->cur_cp = sbi->cur_cp % 2 + 1; + write_checkpoint(sbi); + ret = f2fs_fsync_device(); + ASSERT(ret >= 0); + } +} + void build_nat_area_bitmap(struct f2fs_sb_info *sbi) { struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA); -- 2.18.0.rc1 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
