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Date: Mon, 11 Mar 2024 14:09:54 +0800
From: Chao Yu <chao@...nel.org>
To: Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
niuzhiguo84@...il.com, ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH 2/2] f2fs: fix to handle error paths of
{new,change}_curseg()
On 2024/3/8 18:12, Zhiguo Niu wrote:
> {new,change}_curseg() may return error in some special cases,
> error handling should be did in their callers, and this will also
> facilitate subsequent error path expansion in {new,change}_curseg().
>
> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> fs/f2fs/extent_cache.c | 2 +-
> fs/f2fs/f2fs.h | 4 ++--
> fs/f2fs/gc.c | 7 +++++--
> fs/f2fs/segment.c | 57 +++++++++++++++++++++++++++++++-------------------
> fs/f2fs/super.c | 4 +++-
> 5 files changed, 46 insertions(+), 28 deletions(-)
>
> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
> index 48048fa..dce00cf 100644
> --- a/fs/f2fs/extent_cache.c
> +++ b/fs/f2fs/extent_cache.c
> @@ -988,7 +988,7 @@ bool f2fs_lookup_read_extent_cache_block(struct inode *inode, pgoff_t index,
>
> void f2fs_update_read_extent_cache(struct dnode_of_data *dn)
> {
> - return __update_extent_cache(dn, EX_READ);
> + __update_extent_cache(dn, EX_READ);
Above change is not related to this patch?
Otherwise, it looks good to me.
Thanks,
> }
>
> void f2fs_update_read_extent_cache_range(struct dnode_of_data *dn,
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4836e7c..7beb074 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3700,10 +3700,10 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
> 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 ca1bf41..8852814 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -2035,8 +2035,11 @@ 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 4e4a51a..c1c1308 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 +2888,23 @@ 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 = 0;
>
> curseg->seg_type = target_type;
>
> @@ -2910,38 +2912,41 @@ 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 = 0;
>
> 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 +3074,12 @@ 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 +3090,9 @@ 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 +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 ret;
> }
>
> static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
> @@ -3486,14 +3493,17 @@ 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);
> @@ -3546,17 +3556,17 @@ 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;
> }
>
> @@ -3599,7 +3609,7 @@ 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;
>
> }
>
> @@ -3829,7 +3839,8 @@ 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);
> @@ -3855,12 +3866,14 @@ 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 78a7658..f2b6d3f 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -4685,7 +4685,9 @@ 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);
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