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Date: Thu, 22 Feb 2024 11:50:57 +0800
From: Chao Yu <chao@...nel.org>
To: Zhiguo Niu <niuzhiguo84@...il.com>
Cc: Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org,
linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH v4 4/4] f2fs: stop checkpoint when get a out-of-bounds
segment
On 2024/2/22 10:15, Zhiguo Niu wrote:
>
>
> On Thu, Feb 22, 2024 at 9:37 AM Chao Yu <chao@...nel.org <mailto:chao@...nel.org>> wrote:
>
> On 2024/2/20 14:11, Zhiguo Niu wrote:
> > There is low probability that an out-of-bounds segment will be got
> > on a small-capacity device. In order to prevent subsequent write requests
> > allocating block address from this invalid segment, which may cause
> > unexpected issue, stop checkpoint should be performed.
> >
> > Also introduce a new stop cp reason: STOP_CP_REASON_NO_SEGMENT.
> >
> > Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com <mailto:zhiguo.niu@...soc.com>>
> > ---
> > changes of v4: use more suitable MACRO name according to Chao's suggestions
> > changes of v3: correct MACRO spelling and update based on the lastes code
> > ---
> > ---
> > fs/f2fs/segment.c | 7 ++++++-
> > include/linux/f2fs_fs.h | 1 +
> > 2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index c25aaec..e42e34c 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -2665,7 +2665,12 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
> > if (secno >= MAIN_SECS(sbi)) {
> > secno = find_first_zero_bit(free_i->free_secmap,
> > MAIN_SECS(sbi));
> > - f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
> > + if (secno >= MAIN_SECS(sbi)) {
> > + f2fs_stop_checkpoint(sbi, false,
> > + STOP_CP_REASON_NO_SEGMENT);
>
> We should relocate stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT) outside
> segmap_lock spinlock, due to it may sleep in f2fs_flush_merged_writes().
>
> Indeed it is. How about the following fix?
> @@ -2665,11 +2665,7 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
> if (secno >= MAIN_SECS(sbi)) {
> secno = find_first_zero_bit(free_i->free_secmap,
> MAIN_SECS(sbi));
> - if (secno >= MAIN_SECS(sbi)) {
> - f2fs_stop_checkpoint(sbi, false,
> - STOP_CP_REASON_NO_SEGMENT);
> - f2fs_bug_on(sbi, 1);
> - }
> + f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
> }
> segno = GET_SEG_FROM_SEC(sbi, secno);
> zoneno = GET_ZONE_FROM_SEC(sbi, secno);
> @@ -2700,6 +2696,8 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
> __set_inuse(sbi, segno);
> *newseg = segno;
> spin_unlock(&free_i->segmap_lock);
> + if (secno >= MAIN_SECS(sbi))
> + f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT);
How about this?
---
fs/f2fs/segment.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index d0209ea77dd2..8edc42071e6f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2646,6 +2646,7 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
bool init = true;
int i;
+ int ret = 0;
spin_lock(&free_i->segmap_lock);
@@ -2671,9 +2672,8 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
secno = find_first_zero_bit(free_i->free_secmap,
MAIN_SECS(sbi));
if (secno >= MAIN_SECS(sbi)) {
- f2fs_stop_checkpoint(sbi, false,
- STOP_CP_REASON_NO_SEGMENT);
- f2fs_bug_on(sbi, 1);
+ ret = -ENOSPC;
+ goto out_unlock;
}
}
segno = GET_SEG_FROM_SEC(sbi, secno);
@@ -2704,7 +2704,13 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
__set_inuse(sbi, segno);
*newseg = segno;
+out_unlock:
spin_unlock(&free_i->segmap_lock);
+
+ if (ret) {
+ f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT);
+ f2fs_bug_on(sbi, 1);
+ }
}
static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
--
2.40.1
>
> Thanks,
>
> > + f2fs_bug_on(sbi, 1);
> > + }
> > +
> > }
> > segno = GET_SEG_FROM_SEC(sbi, secno);
> > zoneno = GET_ZONE_FROM_SEC(sbi, secno);
> > diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> > index 9b69c50..755e9a4 100644
> > --- a/include/linux/f2fs_fs.h
> > +++ b/include/linux/f2fs_fs.h
> > @@ -75,6 +75,7 @@ enum stop_cp_reason {
> > STOP_CP_REASON_CORRUPTED_SUMMARY,
> > STOP_CP_REASON_UPDATE_INODE,
> > STOP_CP_REASON_FLUSH_FAIL,
> > + STOP_CP_REASON_NO_SEGMENT,
> > STOP_CP_REASON_MAX,
> > };
> >
>
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