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Date: Tue, 20 Feb 2024 16:22:52 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: kill heap-based allocation
On 2024/2/8 0:46, Jaegeuk Kim wrote:
> No one uses this feature. Let's kill it.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> Documentation/filesystems/f2fs.rst | 3 --
> fs/f2fs/f2fs.h | 51 ++++++++++++++--------------
> fs/f2fs/gc.c | 5 ++-
> fs/f2fs/segment.c | 54 ++++--------------------------
> fs/f2fs/segment.h | 10 ------
> fs/f2fs/super.c | 15 ---------
> 6 files changed, 34 insertions(+), 104 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index 9ac5083dae8e..1ff751009c43 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -126,9 +126,6 @@ norecovery Disable the roll-forward recovery routine, mounted read-
> discard/nodiscard Enable/disable real-time discard in f2fs, if discard is
> enabled, f2fs will issue discard/TRIM commands when a
> segment is cleaned.
> -no_heap Disable heap-style segment allocation which finds free
> - segments for data from the beginning of main area, while
> - for node from the end of main area.
> nouser_xattr Disable Extended User Attributes. Note: xattr is enabled
> by default if CONFIG_F2FS_FS_XATTR is selected.
> noacl Disable POSIX Access Control List. Note: acl is enabled
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 34d718301392..40eb590ed646 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -88,32 +88,31 @@ extern const char *f2fs_fault_name[FAULT_MAX];
> */
> #define F2FS_MOUNT_DISABLE_ROLL_FORWARD 0x00000001
> #define F2FS_MOUNT_DISCARD 0x00000002
> -#define F2FS_MOUNT_NOHEAP 0x00000004
> -#define F2FS_MOUNT_XATTR_USER 0x00000008
> -#define F2FS_MOUNT_POSIX_ACL 0x00000010
> -#define F2FS_MOUNT_DISABLE_EXT_IDENTIFY 0x00000020
> -#define F2FS_MOUNT_INLINE_XATTR 0x00000040
> -#define F2FS_MOUNT_INLINE_DATA 0x00000080
> -#define F2FS_MOUNT_INLINE_DENTRY 0x00000100
> -#define F2FS_MOUNT_FLUSH_MERGE 0x00000200
> -#define F2FS_MOUNT_NOBARRIER 0x00000400
> -#define F2FS_MOUNT_FASTBOOT 0x00000800
> -#define F2FS_MOUNT_READ_EXTENT_CACHE 0x00001000
> -#define F2FS_MOUNT_DATA_FLUSH 0x00002000
> -#define F2FS_MOUNT_FAULT_INJECTION 0x00004000
> -#define F2FS_MOUNT_USRQUOTA 0x00008000
> -#define F2FS_MOUNT_GRPQUOTA 0x00010000
> -#define F2FS_MOUNT_PRJQUOTA 0x00020000
> -#define F2FS_MOUNT_QUOTA 0x00040000
> -#define F2FS_MOUNT_INLINE_XATTR_SIZE 0x00080000
> -#define F2FS_MOUNT_RESERVE_ROOT 0x00100000
> -#define F2FS_MOUNT_DISABLE_CHECKPOINT 0x00200000
> -#define F2FS_MOUNT_NORECOVERY 0x00400000
> -#define F2FS_MOUNT_ATGC 0x00800000
> -#define F2FS_MOUNT_MERGE_CHECKPOINT 0x01000000
> -#define F2FS_MOUNT_GC_MERGE 0x02000000
> -#define F2FS_MOUNT_COMPRESS_CACHE 0x04000000
> -#define F2FS_MOUNT_AGE_EXTENT_CACHE 0x08000000
> +#define F2FS_MOUNT_XATTR_USER 0x00000004
> +#define F2FS_MOUNT_POSIX_ACL 0x00000008
> +#define F2FS_MOUNT_DISABLE_EXT_IDENTIFY 0x00000010
> +#define F2FS_MOUNT_INLINE_XATTR 0x00000020
> +#define F2FS_MOUNT_INLINE_DATA 0x00000040
> +#define F2FS_MOUNT_INLINE_DENTRY 0x00000080
> +#define F2FS_MOUNT_FLUSH_MERGE 0x00000100
> +#define F2FS_MOUNT_NOBARRIER 0x00000200
> +#define F2FS_MOUNT_FASTBOOT 0x00000400
> +#define F2FS_MOUNT_READ_EXTENT_CACHE 0x00000800
> +#define F2FS_MOUNT_DATA_FLUSH 0x00001000
> +#define F2FS_MOUNT_FAULT_INJECTION 0x00002000
> +#define F2FS_MOUNT_USRQUOTA 0x00004000
> +#define F2FS_MOUNT_GRPQUOTA 0x00008000
> +#define F2FS_MOUNT_PRJQUOTA 0x00010000
> +#define F2FS_MOUNT_QUOTA 0x00020000
> +#define F2FS_MOUNT_INLINE_XATTR_SIZE 0x00040000
> +#define F2FS_MOUNT_RESERVE_ROOT 0x00080000
> +#define F2FS_MOUNT_DISABLE_CHECKPOINT 0x00100000
> +#define F2FS_MOUNT_NORECOVERY 0x00200000
> +#define F2FS_MOUNT_ATGC 0x00400000
> +#define F2FS_MOUNT_MERGE_CHECKPOINT 0x00800000
> +#define F2FS_MOUNT_GC_MERGE 0x01000000
> +#define F2FS_MOUNT_COMPRESS_CACHE 0x02000000
> +#define F2FS_MOUNT_AGE_EXTENT_CACHE 0x04000000
>
> #define F2FS_OPTION(sbi) ((sbi)->mount_opt)
> #define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 0a1a50b68df8..8a9cdc5a72c5 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -280,12 +280,11 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
> p->max_search > sbi->max_victim_search)
> p->max_search = sbi->max_victim_search;
>
> - /* let's select beginning hot/small space first in no_heap mode*/
> + /* let's select beginning hot/small space first. */
> if (f2fs_need_rand_seg(sbi))
> p->offset = get_random_u32_below(MAIN_SECS(sbi) *
> SEGS_PER_SEC(sbi));
> - else if (test_opt(sbi, NOHEAP) &&
> - (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
> + else if (type == CURSEG_HOT_DATA || IS_NODESEG(type))
> p->offset = 0;
> else
> p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 1013276ad12a..4e985750c938 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -2632,16 +2632,14 @@ static int is_next_segment_free(struct f2fs_sb_info *sbi,
> * This function should be returned with success, otherwise BUG
> */
> static void get_new_segment(struct f2fs_sb_info *sbi,
> - unsigned int *newseg, bool new_sec, int dir)
> + unsigned int *newseg, bool new_sec)
> {
> struct free_segmap_info *free_i = FREE_I(sbi);
> unsigned int segno, secno, zoneno;
> unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
> unsigned int hint = GET_SEC_FROM_SEG(sbi, *newseg);
> unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
> - unsigned int left_start = hint;
> bool init = true;
> - int go_left = 0;
> int i;
>
> spin_lock(&free_i->segmap_lock);
> @@ -2655,30 +2653,10 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
> find_other_zone:
> secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
> if (secno >= MAIN_SECS(sbi)) {
> - if (dir == ALLOC_RIGHT) {
> - secno = find_first_zero_bit(free_i->free_secmap,
> + secno = find_first_zero_bit(free_i->free_secmap,
> MAIN_SECS(sbi));
> - f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
> - } else {
> - go_left = 1;
> - left_start = hint - 1;
> - }
> - }
> - if (go_left == 0)
> - goto skip_left;
> -
> - while (test_bit(left_start, free_i->free_secmap)) {
> - if (left_start > 0) {
> - left_start--;
> - continue;
> - }
> - left_start = find_first_zero_bit(free_i->free_secmap,
> - MAIN_SECS(sbi));
> - f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
> - break;
> + f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
> }
> - secno = left_start;
> -skip_left:
> segno = GET_SEG_FROM_SEC(sbi, secno);
> zoneno = GET_ZONE_FROM_SEC(sbi, secno);
>
> @@ -2689,21 +2667,13 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
> goto got_it;
> if (zoneno == old_zoneno)
> goto got_it;
> - if (dir == ALLOC_LEFT) {
> - if (!go_left && zoneno + 1 >= total_zones)
> - goto got_it;
> - if (go_left && zoneno == 0)
> - goto got_it;
> - }
> for (i = 0; i < NR_CURSEG_TYPE; i++)
> if (CURSEG_I(sbi, i)->zone == zoneno)
> break;
>
> if (i < NR_CURSEG_TYPE) {
> /* zone is in user, try another */
> - if (go_left)
> - hint = zoneno * sbi->secs_per_zone - 1;
> - else if (zoneno + 1 >= total_zones)
> + if (zoneno + 1 >= total_zones)
> hint = 0;
> else
> hint = (zoneno + 1) * sbi->secs_per_zone;
> @@ -2762,8 +2732,7 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
> if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> return 0;
>
> - if (test_opt(sbi, NOHEAP) &&
> - (seg_type == CURSEG_HOT_DATA || IS_NODESEG(seg_type)))
> + if (seg_type == CURSEG_HOT_DATA || IS_NODESEG(seg_type))
> return 0;
>
> if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
> @@ -2783,21 +2752,12 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
> static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
> {
> struct curseg_info *curseg = CURSEG_I(sbi, type);
> - unsigned short seg_type = curseg->seg_type;
> unsigned int segno = curseg->segno;
> - int dir = ALLOC_LEFT;
>
> if (curseg->inited)
> - write_sum_page(sbi, curseg->sum_blk,
> - GET_SUM_BLOCK(sbi, segno));
> - if (seg_type == CURSEG_WARM_DATA || seg_type == CURSEG_COLD_DATA)
> - dir = ALLOC_RIGHT;
> -
> - if (test_opt(sbi, NOHEAP))
> - dir = ALLOC_RIGHT;
> -
> + write_sum_page(sbi, curseg->sum_blk, GET_SUM_BLOCK(sbi, segno));
> segno = __get_next_segno(sbi, type);
> - get_new_segment(sbi, &segno, new_sec, dir);
> + get_new_segment(sbi, &segno, new_sec);
> curseg->next_segno = segno;
> reset_curseg(sbi, type, 1);
> curseg->alloc_type = LFS;
> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> index b725ae1a7043..60d93a16f2ac 100644
> --- a/fs/f2fs/segment.h
> +++ b/fs/f2fs/segment.h
> @@ -130,16 +130,6 @@ static inline void sanity_check_seg_type(struct f2fs_sb_info *sbi,
> #define SECTOR_TO_BLOCK(sectors) \
> ((sectors) >> F2FS_LOG_SECTORS_PER_BLOCK)
>
> -/*
> - * indicate a block allocation direction: RIGHT and LEFT.
> - * RIGHT means allocating new sections towards the end of volume.
> - * LEFT means the opposite direction.
> - */
> -enum {
> - ALLOC_RIGHT = 0,
> - ALLOC_LEFT
> -};
> -
> /*
> * In the victim_sel_policy->alloc_mode, there are three block allocation modes.
> * LFS writes data sequentially with cleaning operations.
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 3fb44afd0cd1..c04c0d21705f 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -111,8 +111,6 @@ enum {
> Opt_norecovery,
> Opt_discard,
> Opt_nodiscard,
> - Opt_noheap,
> - Opt_heap,
> Opt_user_xattr,
> Opt_nouser_xattr,
> Opt_acl,
> @@ -189,8 +187,6 @@ static match_table_t f2fs_tokens = {
> {Opt_norecovery, "norecovery"},
> {Opt_discard, "discard"},
> {Opt_nodiscard, "nodiscard"},
> - {Opt_noheap, "no_heap"},
> - {Opt_heap, "heap"},
> {Opt_user_xattr, "user_xattr"},
> {Opt_nouser_xattr, "nouser_xattr"},
> {Opt_acl, "acl"},
> @@ -726,12 +722,6 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> }
> clear_opt(sbi, DISCARD);
> break;
> - case Opt_noheap:
> - set_opt(sbi, NOHEAP);
> - break;
> - case Opt_heap:
> - clear_opt(sbi, NOHEAP);
> - break;
If user uses noheap/heap mount option, this may cause mount failure
due to below handling:
default:
f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
p);
return -EINVAL;
Can we keep forward compatibility by continuing to handle noheap/heap
mount option, and leave kernel message as notification for such cases?
Thanks,
> #ifdef CONFIG_F2FS_FS_XATTR
> case Opt_user_xattr:
> set_opt(sbi, XATTR_USER);
> @@ -1956,10 +1946,6 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> } else {
> seq_puts(seq, ",nodiscard");
> }
> - if (test_opt(sbi, NOHEAP))
> - seq_puts(seq, ",no_heap");
> - else
> - seq_puts(seq, ",heap");
> #ifdef CONFIG_F2FS_FS_XATTR
> if (test_opt(sbi, XATTR_USER))
> seq_puts(seq, ",user_xattr");
> @@ -2136,7 +2122,6 @@ static void default_options(struct f2fs_sb_info *sbi, bool remount)
> set_opt(sbi, INLINE_XATTR);
> set_opt(sbi, INLINE_DATA);
> set_opt(sbi, INLINE_DENTRY);
> - set_opt(sbi, NOHEAP);
> set_opt(sbi, MERGE_CHECKPOINT);
> F2FS_OPTION(sbi).unusable_cap = 0;
> sbi->sb->s_flags |= SB_LAZYTIME;
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