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* [PATCH v2 2/2] f2fs: fix to update mtime correctly
@ 2018-06-04 15:20 Chao Yu
  0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2018-06-04 15:20 UTC (permalink / raw)
  To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, Chao Yu

From: Chao Yu <yuchao0@huawei.com>

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>
---
v2:
- fix to correct return value of get_mtime().
 fs/f2fs/checkpoint.c |  2 +-
 fs/f2fs/segment.c    |  7 ++++---
 fs/f2fs/segment.h    | 17 ++++++++++++++---
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 76e1856e4666..c7ffa1e0e021 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1223,7 +1223,7 @@ 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] =
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 66983acaad16..c1bd31da772d 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -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) {
@@ -3879,7 +3880,7 @@ 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);
 }
 
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index c574131ac7e1..f18fc82fbe99 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -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,
-- 
2.16.2.17.g38e79b1fd

^ permalink raw reply related	[flat|nested] 2+ messages in thread
* [PATCH v2 1/2] f2fs: fix to correct return value of f2fs_trim_fs
@ 2018-05-30 15:10 Chao Yu
  2018-05-30 15:10 ` [PATCH v2 2/2] f2fs: fix to update mtime correctly Chao Yu
  0 siblings, 1 reply; 2+ messages in thread
From: Chao Yu @ 2018-05-30 15:10 UTC (permalink / raw)
  To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, Chao Yu

From: Chao Yu <yuchao0@huawei.com>

We should account trimmed block number from __wait_all_discard_cmd
in __issue_discard_cmd_range, otherwise trimmed blocks returned
by f2fs_trim_fs will be wrong, this patch fixes it.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
v2:
- fix to add missing return value in __wait_all_discard_cmd.
 fs/f2fs/segment.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 4b24a68f4dc7..66983acaad16 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1319,21 +1319,21 @@ static unsigned int __wait_discard_cmd_range(struct f2fs_sb_info *sbi,
 	return trimmed;
 }
 
-static void __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
+static unsigned int __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
 						struct discard_policy *dpolicy)
 {
 	struct discard_policy dp;
+	unsigned int discard_blks;
 
-	if (dpolicy) {
-		__wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
-		return;
-	}
+	if (dpolicy)
+		return __wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
 
 	/* wait all */
 	__init_discard_policy(sbi, &dp, DPOLICY_FSTRIM, 1);
-	__wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
+	discard_blks = __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
 	__init_discard_policy(sbi, &dp, DPOLICY_UMOUNT, 1);
-	__wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
+	discard_blks += __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
+	return 0;
 }
 
 /* This should be covered by global mutex, &sit_i->sentry_lock */
@@ -2365,7 +2365,7 @@ bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
 	return has_candidate;
 }
 
-static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
+static unsigned int __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
 					struct discard_policy *dpolicy,
 					unsigned int start, unsigned int end)
 {
@@ -2375,6 +2375,7 @@ static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
 	struct discard_cmd *dc;
 	struct blk_plug plug;
 	int issued;
+	unsigned int trimmed = 0;
 
 next:
 	issued = 0;
@@ -2410,7 +2411,7 @@ static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
 
 			blk_finish_plug(&plug);
 			mutex_unlock(&dcc->cmd_lock);
-			__wait_all_discard_cmd(sbi, NULL);
+			trimmed += __wait_all_discard_cmd(sbi, NULL);
 			congestion_wait(BLK_RW_ASYNC, HZ/50);
 			goto next;
 		}
@@ -2424,6 +2425,8 @@ static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
 
 	blk_finish_plug(&plug);
 	mutex_unlock(&dcc->cmd_lock);
+
+	return trimmed;
 }
 
 int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
@@ -2434,7 +2437,7 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
 	block_t start_block, end_block;
 	struct cp_control cpc;
 	struct discard_policy dpolicy;
-	unsigned long long trimmed = 0;
+	unsigned long long trimmed;
 	int err = 0;
 
 	if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
@@ -2472,8 +2475,9 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
 	end_block = START_BLOCK(sbi, end_segno + 1);
 
 	__init_discard_policy(sbi, &dpolicy, DPOLICY_FSTRIM, cpc.trim_minlen);
-	__issue_discard_cmd_range(sbi, &dpolicy, start_block, end_block);
-	trimmed = __wait_discard_cmd_range(sbi, &dpolicy,
+	trimmed = __issue_discard_cmd_range(sbi, &dpolicy,
+					start_block, end_block);
+	trimmed += __wait_discard_cmd_range(sbi, &dpolicy,
 					start_block, end_block);
 	range->len = F2FS_BLK_TO_BYTES(trimmed);
 out:
-- 
2.16.2.17.g38e79b1fd

^ permalink raw reply related	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-06-04 15:22 UTC | newest]

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2018-06-04 15:20 [PATCH v2 2/2] f2fs: fix to update mtime correctly Chao Yu
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2018-05-30 15:10 [PATCH v2 1/2] f2fs: fix to correct return value of f2fs_trim_fs Chao Yu
2018-05-30 15:10 ` [PATCH v2 2/2] f2fs: fix to update mtime correctly Chao Yu

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