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f2fs: fix to update mtime correctly 

If we change system time to the past, get_mtime() will return a
overflowed time, and SIT_I(sbi)->max_mtime will be udpated
incorrectly, this patch fixes the two issues.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2018-06-04 23:20:17 +08:00 committed by Jaegeuk Kim
parent 1061fd484b
commit a1f72ac2c0
3 changed files with 19 additions and 7 deletions
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2
fs/f2fs/checkpoint.c
View File

@ -1233,7 +1233,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
* modify checkpoint
* version number is already updated
*/
ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
ckpt->cur_node_segno[i] =

7
fs/f2fs/segment.c
View File

@ -1822,8 +1822,9 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
(new_vblocks > sbi->blocks_per_seg)));
se->valid_blocks = new_vblocks;
se->mtime = get_mtime(sbi);
SIT_I(sbi)->max_mtime = se->mtime;
se->mtime = get_mtime(sbi, false);
if (se->mtime > SIT_I(sbi)->max_mtime)
SIT_I(sbi)->max_mtime = se->mtime;
/* Update valid block bitmap */
if (del > 0) {
@ -3884,7 +3885,7 @@ static void init_min_max_mtime(struct f2fs_sb_info *sbi)
if (sit_i->min_mtime > mtime)
sit_i->min_mtime = mtime;
}
sit_i->max_mtime = get_mtime(sbi);
sit_i->max_mtime = get_mtime(sbi, false);
up_write(&sit_i->sentry_lock);
}

17
fs/f2fs/segment.h
View File

@ -745,12 +745,23 @@ static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
#endif
}
static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi)
static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi,
bool base_time)
{
struct sit_info *sit_i = SIT_I(sbi);
time64_t now = ktime_get_real_seconds();
time64_t diff, now = ktime_get_real_seconds();
return sit_i->elapsed_time + now - sit_i->mounted_time;
if (now >= sit_i->mounted_time)
return sit_i->elapsed_time + now - sit_i->mounted_time;
/* system time is set to the past */
if (!base_time) {
diff = sit_i->mounted_time - now;
if (sit_i->elapsed_time >= diff)
return sit_i->elapsed_time - diff;
return 0;
}
return sit_i->elapsed_time;
}
static inline void set_summary(struct f2fs_summary *sum, nid_t nid,