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 duplicate
valid checkpoint to mirror position first, and then, write fixed checkpoint
to CP #0 position.
This can make sure that, while fsck repairing, even there is sudden
power-cut, last valid checkpoint can be kept in CP #1 position.
Signed-off-by: Weichao Guo <guoweichao@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
unsigned int cur_victim_sec; /* current victim section num */
u32 free_segments;
+
+ int cp_backuped; /* backup valid checkpoint */
};
static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
ASSERT(ret >= 0);
}
+static void fix_checkpoints(struct f2fs_sb_info *sbi)
+{
+ /* copy valid checkpoint to its mirror position */
+ duplicate_checkpoint(sbi);
+
+ /* repair checkpoint at CP #0 position */
+ sbi->cur_cp = 1;
+ fix_checkpoint(sbi);
+}
+
int check_curseg_offset(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
}
}
#endif
+
/* fix global metadata */
if (force || (c.fix_on && f2fs_dev_is_writable())) {
struct f2fs_checkpoint *cp = F2FS_CKPT(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;
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 duplicate_checkpoint(struct f2fs_sb_info *);
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);
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)
free(nat_block);
}
+void duplicate_checkpoint(struct f2fs_sb_info *sbi)
+{
+ struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
+ unsigned long long dst, src;
+ void *buf;
+ unsigned int seg_size = 1 << get_sb(log_blocks_per_seg);
+ int ret;
+
+ if (sbi->cp_backuped)
+ return;
+
+ buf = malloc(F2FS_BLKSIZE * seg_size);
+ ASSERT(buf);
+
+ if (sbi->cur_cp == 1) {
+ src = get_sb(cp_blkaddr);
+ dst = src + seg_size;
+ } else {
+ dst = get_sb(cp_blkaddr);
+ src = dst + seg_size;
+ }
+
+ ret = dev_read(buf, src << F2FS_BLKSIZE_BITS,
+ seg_size << F2FS_BLKSIZE_BITS);
+ ASSERT(ret >= 0);
+
+ ret = dev_write(buf, dst << F2FS_BLKSIZE_BITS,
+ seg_size << F2FS_BLKSIZE_BITS);
+ ASSERT(ret >= 0);
+
+ free(buf);
+
+ ret = f2fs_fsync_device();
+ ASSERT(ret >= 0);
+
+ sbi->cp_backuped = 1;
+
+ MSG(0, "Info: Duplicate valid checkpoint to mirror position "
+ "%llu -> %llu\n", src, dst);
+}
+
void write_checkpoint(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
ASSERT(ret >= 0);
}
+void write_checkpoints(struct f2fs_sb_info *sbi)
+{
+ /* copy valid checkpoint to its mirror position */
+ duplicate_checkpoint(sbi);
+
+ /* repair checkpoint at CP #0 position */
+ sbi->cur_cp = 1;
+ write_checkpoint(sbi);
+}
+
void build_nat_area_bitmap(struct f2fs_sb_info *sbi)
{
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);