Re: [PATCH] f2fs: fix to check result of new_curseg in f2fs_allocate_segment_for_resize

From: Zhiguo Niu
Date: Mon Mar 04 2024 - 05:43:58 EST

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In reply to: Chao Yu: "Re: [PATCH] f2fs: fix to check result of new_curseg in f2fs_allocate_segment_for_resize"
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On Mon, Mar 4, 2024 at 5:19 PM Chao Yu <chao@xxxxxxxxxx> wrote:
>
> On 2024/3/4 15:52, Zhiguo Niu wrote:
> > On Mon, Mar 4, 2024 at 3:17 PM Chao Yu <chao@xxxxxxxxxx> wrote:
> >>
> >> On 2024/3/4 11:33, Zhiguo Niu wrote:
> >>> On Mon, Mar 4, 2024 at 11:19 AM Chao Yu <chao@xxxxxxxxxx> wrote:
> >>>>
> >>>> On 2024/3/1 19:36, Zhiguo Niu wrote:
> >>>>> new_curseg may return error if get_new_segment fail, so its result
> >>>>> should be check in its caller f2fs_allocate_segment_for_resize,
> >>>>> alos pass this results to free_segment_range.
> >>>>
> >>>> Zhiguo,
> >>>>
> >>>> What about handling all error paths of new_curseg() and change_curseg()
> >>>> in one patch?
> >>> Dear Chao,
> >>>
> >>> Do you mean to merge it with the previous patch “f2fs: fix to check
> >>> return value of f2fs_gc_range”?
> >>> Because in addition to new_curseg/change_curseg error handling, there
> >>> are some other changes in the previous patch.
> >>> besides, I searched for new related codes, and there should be the
> >>> only place left without error handling about new_curseg/
> >>> change_curseg .
> >>
> >> Zhiguo, I meant something like this?
> >>
> >> Subject: [PATCH] f2fs: fix to handle error paths of {new,change}_curseg()
> > Dear Chao,
> > I got your meaning and I think this patch looks good.
> > Please ignore my patch and use your version:）.
>
> Zhiguo,
>
> This is a raw patch, can you please write commit message for it, and
> resend it once you've tested it.
Dear Chao,
OK, no problem.
thanks!
>
> Thanks,
>
> > thanks!
> >>
> >> ---
> >> fs/f2fs/f2fs.h | 4 +--
> >> fs/f2fs/gc.c | 7 +++--
> >> fs/f2fs/segment.c | 67 +++++++++++++++++++++++++++++++----------------
> >> fs/f2fs/super.c | 4 ++-
> >> 4 files changed, 54 insertions(+), 28 deletions(-)
> >>
> >> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >> index 80789255bf68..03927f1b2ea1 100644
> >> --- a/fs/f2fs/f2fs.h
> >> +++ b/fs/f2fs/f2fs.h
> >> @@ -3702,10 +3702,10 @@ int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable);
> >> void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
> >> int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
> >> bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno);
> >> -void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
> >> +int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
> >> void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi);
> >> void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi);
> >> -void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> +int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> unsigned int start, unsigned int end);
> >> int f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force);
> >> int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi);
> >> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> >> index f8314765246a..854ad0a3f6ea 100644
> >> --- a/fs/f2fs/gc.c
> >> +++ b/fs/f2fs/gc.c
> >> @@ -2033,8 +2033,11 @@ static int free_segment_range(struct f2fs_sb_info *sbi,
> >> mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
> >>
> >> /* Move out cursegs from the target range */
> >> - for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
> >> - f2fs_allocate_segment_for_resize(sbi, type, start, end);
> >> + for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++) {
> >> + err = f2fs_allocate_segment_for_resize(sbi, type, start, end);
> >> + if (err)
> >> + goto out;
> >> + }
> >>
> >> /* do GC to move out valid blocks in the range */
> >> err = f2fs_gc_range(sbi, start, end, dry_run, 0);
> >> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> >> index 22241aba6564..2bcf01fde143 100644
> >> --- a/fs/f2fs/segment.c
> >> +++ b/fs/f2fs/segment.c
> >> @@ -2863,7 +2863,7 @@ bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno)
> >> * This function always allocates a used segment(from dirty seglist) by SSR
> >> * manner, so it should recover the existing segment information of valid blocks
> >> */
> >> -static void change_curseg(struct f2fs_sb_info *sbi, int type)
> >> +static int change_curseg(struct f2fs_sb_info *sbi, int type)
> >> {
> >> struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
> >> struct curseg_info *curseg = CURSEG_I(sbi, type);
> >> @@ -2888,21 +2888,24 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type)
> >> if (IS_ERR(sum_page)) {
> >> /* GC won't be able to use stale summary pages by cp_error */
> >> memset(curseg->sum_blk, 0, SUM_ENTRY_SIZE);
> >> - return;
> >> + return PTR_ERR(sum_page);
> >> }
> >> sum_node = (struct f2fs_summary_block *)page_address(sum_page);
> >> memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
> >> f2fs_put_page(sum_page, 1);
> >> +
> >> + return 0;
> >> }
> >>
> >> static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
> >> int alloc_mode, unsigned long long age);
> >>
> >> -static void get_atssr_segment(struct f2fs_sb_info *sbi, int type,
> >> +static int get_atssr_segment(struct f2fs_sb_info *sbi, int type,
> >> int target_type, int alloc_mode,
> >> unsigned long long age)
> >> {
> >> struct curseg_info *curseg = CURSEG_I(sbi, type);
> >> + int ret;
> >>
> >> curseg->seg_type = target_type;
> >>
> >> @@ -2910,38 +2913,45 @@ static void get_atssr_segment(struct f2fs_sb_info *sbi, int type,
> >> struct seg_entry *se = get_seg_entry(sbi, curseg->next_segno);
> >>
> >> curseg->seg_type = se->type;
> >> - change_curseg(sbi, type);
> >> + ret = change_curseg(sbi, type);
> >> } else {
> >> /* allocate cold segment by default */
> >> curseg->seg_type = CURSEG_COLD_DATA;
> >> - new_curseg(sbi, type, true);
> >> + ret = new_curseg(sbi, type, true);
> >> }
> >> stat_inc_seg_type(sbi, curseg);
> >> +
> >> + return ret;
> >> }
> >>
> >> -static void __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi)
> >> +static int __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi)
> >> {
> >> struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC);
> >> + int ret;
> >>
> >> if (!sbi->am.atgc_enabled)
> >> - return;
> >> + return 0;
> >>
> >> f2fs_down_read(&SM_I(sbi)->curseg_lock);
> >>
> >> mutex_lock(&curseg->curseg_mutex);
> >> down_write(&SIT_I(sbi)->sentry_lock);
> >>
> >> - get_atssr_segment(sbi, CURSEG_ALL_DATA_ATGC, CURSEG_COLD_DATA, SSR, 0);
> >> + ret = get_atssr_segment(sbi, CURSEG_ALL_DATA_ATGC,
> >> + CURSEG_COLD_DATA, SSR, 0);
> >>
> >> up_write(&SIT_I(sbi)->sentry_lock);
> >> mutex_unlock(&curseg->curseg_mutex);
> >>
> >> f2fs_up_read(&SM_I(sbi)->curseg_lock);
> >>
> >> + return ret;
> >> +
> >> }
> >> -void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi)
> >> +
> >> +int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi)
> >> {
> >> - __f2fs_init_atgc_curseg(sbi);
> >> + return __f2fs_init_atgc_curseg(sbi);
> >> }
> >>
> >> static void __f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type)
> >> @@ -3069,11 +3079,12 @@ static bool need_new_seg(struct f2fs_sb_info *sbi, int type)
> >> return false;
> >> }
> >>
> >> -void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> +int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> unsigned int start, unsigned int end)
> >> {
> >> struct curseg_info *curseg = CURSEG_I(sbi, type);
> >> unsigned int segno;
> >> + int ret = 0;
> >>
> >> f2fs_down_read(&SM_I(sbi)->curseg_lock);
> >> mutex_lock(&curseg->curseg_mutex);
> >> @@ -3084,9 +3095,9 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> goto unlock;
> >>
> >> if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type, SSR, 0))
> >> - change_curseg(sbi, type);
> >> + ret = change_curseg(sbi, type);
> >> else
> >> - new_curseg(sbi, type, true);
> >> + ret = new_curseg(sbi, type, true);
> >>
> >> stat_inc_seg_type(sbi, curseg);
> >>
> >> @@ -3100,6 +3111,8 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>
> >> mutex_unlock(&curseg->curseg_mutex);
> >> f2fs_up_read(&SM_I(sbi)->curseg_lock);
> >> +
> >> + return ret;
> >> }
> >>
> >> static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
> >> @@ -3107,6 +3120,7 @@ static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
> >> {
> >> struct curseg_info *curseg = CURSEG_I(sbi, type);
> >> unsigned int old_segno;
> >> + int ret;
> >>
> >> if (type == CURSEG_COLD_DATA_PINNED && !curseg->inited)
> >> goto allocate;
> >> @@ -3119,8 +3133,9 @@ static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
> >>
> >> allocate:
> >> old_segno = curseg->segno;
> >> - if (new_curseg(sbi, type, true))
> >> - return -EAGAIN;
> >> + ret = new_curseg(sbi, type, true);
> >> + if (ret)
> >> + return ret;
> >> stat_inc_seg_type(sbi, curseg);
> >> locate_dirty_segment(sbi, old_segno);
> >> return 0;
> >> @@ -3480,14 +3495,17 @@ int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> >> bool from_gc = (type == CURSEG_ALL_DATA_ATGC);
> >> struct seg_entry *se = NULL;
> >> bool segment_full = false;
> >> + int ret = 0;
> >>
> >> f2fs_down_read(&SM_I(sbi)->curseg_lock);
> >>
> >> mutex_lock(&curseg->curseg_mutex);
> >> down_write(&sit_i->sentry_lock);
> >>
> >> - if (curseg->segno == NULL_SEGNO)
> >> + if (curseg->segno == NULL_SEGNO) {
> >> + ret = -ENOSPC;
> >> goto out_err;
> >> + }
> >>
> >> if (from_gc) {
> >> f2fs_bug_on(sbi, GET_SEGNO(sbi, old_blkaddr) == NULL_SEGNO);
> >> @@ -3541,17 +3559,17 @@ int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> >> }
> >>
> >> if (from_gc) {
> >> - get_atssr_segment(sbi, type, se->type,
> >> + ret = get_atssr_segment(sbi, type, se->type,
> >> AT_SSR, se->mtime);
> >> } else {
> >> if (need_new_seg(sbi, type))
> >> - new_curseg(sbi, type, false);
> >> + ret = new_curseg(sbi, type, false);
> >> else
> >> - change_curseg(sbi, type);
> >> + ret = change_curseg(sbi, type);
> >> stat_inc_seg_type(sbi, curseg);
> >> }
> >>
> >> - if (curseg->segno == NULL_SEGNO)
> >> + if (ret)
> >> goto out_err;
> >> }
> >>
> >> @@ -3594,7 +3612,7 @@ int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> >> up_write(&sit_i->sentry_lock);
> >> mutex_unlock(&curseg->curseg_mutex);
> >> f2fs_up_read(&SM_I(sbi)->curseg_lock);
> >> - return -ENOSPC;
> >> + return ret;
> >>
> >> }
> >>
> >> @@ -3824,7 +3842,8 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
> >> /* change the current segment */
> >> if (segno != curseg->segno) {
> >> curseg->next_segno = segno;
> >> - change_curseg(sbi, type);
> >> + if (change_curseg(sbi, type))
> >> + goto out_unlock;
> >> }
> >>
> >> curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
> >> @@ -3850,12 +3869,14 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
> >> if (recover_curseg) {
> >> if (old_cursegno != curseg->segno) {
> >> curseg->next_segno = old_cursegno;
> >> - change_curseg(sbi, type);
> >> + if (change_curseg(sbi, type))
> >> + goto out_unlock;
> >> }
> >> curseg->next_blkoff = old_blkoff;
> >> curseg->alloc_type = old_alloc_type;
> >> }
> >>
> >> +out_unlock:
> >> up_write(&sit_i->sentry_lock);
> >> mutex_unlock(&curseg->curseg_mutex);
> >> f2fs_up_write(&SM_I(sbi)->curseg_lock);
> >> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> >> index 0676c2dcbbf7..8c69257db8cc 100644
> >> --- a/fs/f2fs/super.c
> >> +++ b/fs/f2fs/super.c
> >> @@ -4691,7 +4691,9 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> >> if (err)
> >> goto free_meta;
> >>
> >> - f2fs_init_inmem_curseg(sbi);
> >> + err = f2fs_init_inmem_curseg(sbi);
> >> + if (err)
> >> + goto sync_free_meta;
> >>
> >> /* f2fs_recover_fsync_data() cleared this already */
> >> clear_sbi_flag(sbi, SBI_POR_DOING);
> >> --
> >> 2.40.1
> >>
> >>
> >>
> >>>
> >>> thanks!
> >>>>
> >>>> Thanks,
> >>>>
> >>>>>
> >>>>> Signed-off-by: Zhiguo Niu <zhiguo.niu@xxxxxxxxxx>
> >>>>> ---
> >>>>> fs/f2fs/f2fs.h | 2 +-
> >>>>> fs/f2fs/gc.c | 7 +++++--
> >>>>> fs/f2fs/segment.c | 9 +++++++--
> >>>>> 3 files changed, 13 insertions(+), 5 deletions(-)
> >>>>>
> >>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >>>>> index 4331012..39dda7d 100644
> >>>>> --- a/fs/f2fs/f2fs.h
> >>>>> +++ b/fs/f2fs/f2fs.h
> >>>>> @@ -3701,7 +3701,7 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
> >>>>> void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
> >>>>> void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi);
> >>>>> void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi);
> >>>>> -void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>> +int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>> unsigned int start, unsigned int end);
> >>>>> int f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force);
> >>>>> int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi);
> >>>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> >>>>> index c60b747..7a458fa 100644
> >>>>> --- a/fs/f2fs/gc.c
> >>>>> +++ b/fs/f2fs/gc.c
> >>>>> @@ -2037,8 +2037,11 @@ static int free_segment_range(struct f2fs_sb_info *sbi,
> >>>>> mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
> >>>>>
> >>>>> /* Move out cursegs from the target range */
> >>>>> - for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
> >>>>> - f2fs_allocate_segment_for_resize(sbi, type, start, end);
> >>>>> + for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++) {
> >>>>> + err = f2fs_allocate_segment_for_resize(sbi, type, start, end);
> >>>>> + if (err)
> >>>>> + goto out;
> >>>>> + }
> >>>>>
> >>>>> /* do GC to move out valid blocks in the range */
> >>>>> err = f2fs_gc_range(sbi, start, end, dry_run, 0);
> >>>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> >>>>> index 1bb3019..2a07b9d 100644
> >>>>> --- a/fs/f2fs/segment.c
> >>>>> +++ b/fs/f2fs/segment.c
> >>>>> @@ -3071,11 +3071,12 @@ static bool need_new_seg(struct f2fs_sb_info *sbi, int type)
> >>>>> return false;
> >>>>> }
> >>>>>
> >>>>> -void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>> +int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>> unsigned int start, unsigned int end)
> >>>>> {
> >>>>> struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>>> unsigned int segno;
> >>>>> + int err = 0;
> >>>>>
> >>>>> f2fs_down_read(&SM_I(sbi)->curseg_lock);
> >>>>> mutex_lock(&curseg->curseg_mutex);
> >>>>> @@ -3089,7 +3090,10 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>> change_curseg(sbi, type);
> >>>>> else
> >>>>> new_curseg(sbi, type, true);
> >>>>> -
> >>>>> + if (curseg->segno == NULL_SEGNO) {
> >>>>> + err = -ENOSPC;
> >>>>> + goto unlock;
> >>>>> + }
> >>>>> stat_inc_seg_type(sbi, curseg);
> >>>>>
> >>>>> locate_dirty_segment(sbi, segno);
> >>>>> @@ -3102,6 +3106,7 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>>
> >>>>> mutex_unlock(&curseg->curseg_mutex);
> >>>>> f2fs_up_read(&SM_I(sbi)->curseg_lock);
> >>>>> + return err;
> >>>>> }
> >>>>>
> >>>>> static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,

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