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Message-ID: <04a4dcd6-e8cb-4378-bf79-e4e90af17e87@kernel.org> Date: Tue, 23 Dec 2025 10:33:59 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Daeho Jeong References: <20251221032336.3374290-1-daeho43@gmail.com> Content-Language: en-US In-Reply-To: X-Headers-End: 1vXsE0-0001Qa-8C Subject: Re: [f2fs-dev] [PATCH v5] f2fs-tools: revert summary entry count from 2048 to 512 in 16kb block support X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Chao Yu via Linux-f2fs-devel Reply-To: Chao Yu Cc: Daeho Jeong , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gMTIvMjMvMjUgMDA6MDksIERhZWhvIEplb25nIHdyb3RlOgo+IE9uIE1vbiwgRGVjIDIyLCAy 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linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com, Daeho Jeong Subject: Re: [f2fs-dev] [PATCH v5] f2fs-tools: revert summary entry count from 2048 to 512 in 16kb block support To: Daeho Jeong References: <20251221032336.3374290-1-daeho43@gmail.com> Content-Language: en-US From: Chao Yu In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 12/23/25 00:09, Daeho Jeong wrote: > On Mon, Dec 22, 2025 at 1:28 AM Chao Yu wrote: >> >> On 12/21/25 11:23, Daeho Jeong wrote: >>> From: Daeho Jeong >>> >>> The recent increase in the number of Segment Summary Area (SSA) entries >>> from 512 to 2048 was an unintentional change in logic of 16kb block >>> support. This commit corrects the issue. >>> >>> To better utilize the space available from the erroneous 2048-entry >>> calculation, we are implementing a solution to share the currently >>> unused SSA space with neighboring segments. This enhances overall >>> SSA utilization without impacting the established 8MB segment size. >>> >>> Fixes: 50fd00b168d7 ("f2fs-tools: Support different block sizes") >>> Signed-off-by: Daeho Jeong >>> --- >>> v5: support both old and new format with packed_ssa feature option >>> v4: move enabling the feature position. >>> v3: add a feature to prevent from mounting deprecated format >>> v2: detect legacy layout and prevent mount. >>> fix ssa block calculation bug in resize tool. >>> --- >>> fsck/f2fs.h | 27 ++++++++++- >>> fsck/fsck.c | 16 +++---- >>> fsck/inject.c | 4 +- >>> fsck/mount.c | 51 ++++++++++----------- >>> fsck/resize.c | 99 ++++++++++++++++++++++++++--------------- >>> include/f2fs_fs.h | 17 ++++--- >>> lib/libf2fs_io.c | 12 +++++ >>> mkfs/f2fs_format.c | 10 ++++- >>> mkfs/f2fs_format_main.c | 6 +++ >>> 9 files changed, 158 insertions(+), 84 deletions(-) >>> >>> diff --git a/fsck/f2fs.h b/fsck/f2fs.h >>> index 60e3a2e..5e7eb63 100644 >>> --- a/fsck/f2fs.h >>> +++ b/fsck/f2fs.h >>> @@ -447,12 +447,37 @@ static inline block_t __end_block_addr(struct f2fs_sb_info *sbi) >>> (SM_I(sbi) ? SM_I(sbi)->seg0_blkaddr : \ >>> le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment0_blkaddr)) >>> >>> +#define SUMS_PER_BLOCK (F2FS_BLKSIZE / F2FS_SUM_BLKSIZE) >>> #define GET_SUM_BLKADDR(sbi, segno) \ >>> - ((sbi->sm_info->ssa_blkaddr) + segno) >>> + (c.feature & F2FS_FEATURE_PACKED_SSA ? \ >>> + ((SM_I(sbi)->ssa_blkaddr) + (segno) / SUMS_PER_BLOCK) : \ >>> + ((SM_I(sbi)->ssa_blkaddr) + (segno))) >>> +#define GET_SUM_BLKOFF(segno) \ >>> + (c.feature & F2FS_FEATURE_PACKED_SSA ? \ >>> + ((segno) % SUMS_PER_BLOCK) : 0) >>> >>> #define GET_SEGOFF_FROM_SEG0(sbi, blk_addr) \ >>> ((blk_addr) - SM_I(sbi)->seg0_blkaddr) >>> >>> +static inline int write_sum_block(struct f2fs_sb_info *sbi, >>> + void *buf, unsigned int segno, enum rw_hint whint) >> >> What do you think of changing parameters as below? >> >> static inline int write_sum_block(struct f2fs_sb_info *sbi, >> void *buf, block_t block, unsigned blkoff, enum rw_hint whint) >> >> So we can use this function to clean up codes in other places. > > If we pick this style, it will look more complicated, since we need to > use the GET_SUM_BLKADDR > and GET_SUM_BLKOFF everywhere outside of write/read_sum_block(). I think it's fine to spread GET_SUM_BLKADDR/GET_SUM_BLKOFF, but anyway, it's fine to leave it as it is since it's minor cleanup. > >> >>> +{ >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + return dev_write_4k_block(buf, GET_SUM_BLKADDR(sbi, segno), >>> + GET_SUM_BLKOFF(segno), whint); >>> + return dev_write_block(buf, GET_SUM_BLKADDR(sbi, segno), whint); >>> +} >>> + >>> +static inline int read_sum_block(struct f2fs_sb_info *sbi, >>> + void *buf, unsigned int segno) >> >> Ditto, >> >>> +{ >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + return dev_read_4k_block(buf, GET_SUM_BLKADDR(sbi, segno), >>> + GET_SUM_BLKOFF(segno)); >>> + return dev_read_block(buf, GET_SUM_BLKADDR(sbi, segno)); >>> +} >>> + >>> + >>> #define GET_SEGNO_FROM_SEG0(sbi, blk_addr) \ >>> (GET_SEGOFF_FROM_SEG0(sbi, blk_addr) >> sbi->log_blocks_per_seg) >>> >>> diff --git a/fsck/fsck.c b/fsck/fsck.c >>> index 0b53c67..db44f9d 100644 >>> --- a/fsck/fsck.c >>> +++ b/fsck/fsck.c >>> @@ -228,11 +228,9 @@ static int is_valid_ssa_node_blk(struct f2fs_sb_info *sbi, u32 nid, >>> } >>> } >>> if (need_fix && f2fs_dev_is_writable()) { >>> - u64 ssa_blk; >>> int ret2; >>> >>> - ssa_blk = GET_SUM_BLKADDR(sbi, segno); >>> - ret2 = dev_write_block(sum_blk, ssa_blk, WRITE_LIFE_NONE); >>> + ret2 = write_sum_block(sbi, sum_blk, segno, WRITE_LIFE_NONE); >>> ASSERT(ret2 >= 0); >>> } >>> out: >>> @@ -367,11 +365,9 @@ static int is_valid_ssa_data_blk(struct f2fs_sb_info *sbi, u32 blk_addr, >>> } >>> } >>> if (need_fix && f2fs_dev_is_writable()) { >>> - u64 ssa_blk; >>> int ret2; >>> >>> - ssa_blk = GET_SUM_BLKADDR(sbi, segno); >>> - ret2 = dev_write_block(sum_blk, ssa_blk, WRITE_LIFE_NONE); >>> + ret2 = write_sum_block(sbi, sum_blk, segno, WRITE_LIFE_NONE); >>> ASSERT(ret2 >= 0); >>> } >>> out: >>> @@ -3879,14 +3875,12 @@ int fsck_verify(struct f2fs_sb_info *sbi) >>> rewrite_sit_area_bitmap(sbi); >>> if (c.zoned_model == F2FS_ZONED_HM) { >>> struct curseg_info *curseg; >>> - u64 ssa_blk; >>> >>> for (i = 0; i < NO_CHECK_TYPE; i++) { >>> curseg = CURSEG_I(sbi, i); >>> - ssa_blk = GET_SUM_BLKADDR(sbi, >>> - curseg->segno); >>> - ret = dev_write_block(curseg->sum_blk, >>> - ssa_blk, >>> + ret = write_sum_block(sbi, >>> + curseg->sum_blk, >>> + curseg->segno, >>> WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> } >>> diff --git a/fsck/inject.c b/fsck/inject.c >>> index 0e46b1b..b00e356 100644 >>> --- a/fsck/inject.c >>> +++ b/fsck/inject.c >>> @@ -935,7 +935,6 @@ static int inject_ssa(struct f2fs_sb_info *sbi, struct inject_option *opt) >>> struct summary_footer *footer; >>> struct f2fs_summary *sum; >>> u32 segno, offset; >>> - block_t ssa_blkaddr; >>> int type; >>> int ret; >>> >>> @@ -1000,8 +999,7 @@ static int inject_ssa(struct f2fs_sb_info *sbi, struct inject_option *opt) >>> >>> print_sum_footer_info(footer); >>> >>> - ssa_blkaddr = GET_SUM_BLKADDR(sbi, segno); >>> - ret = dev_write_block(sum_blk, ssa_blkaddr, WRITE_LIFE_NONE); >>> + ret = write_sum_block(sbi, sum_blk, segno, WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> >>> out: >>> diff --git a/fsck/mount.c b/fsck/mount.c >>> index f03fa2d..43b1246 100644 >>> --- a/fsck/mount.c >>> +++ b/fsck/mount.c >>> @@ -2150,6 +2150,7 @@ static void read_normal_summaries(struct f2fs_sb_info *sbi, int type) >>> struct curseg_info *curseg; >>> unsigned int segno = 0; >>> block_t blk_addr = 0; >>> + __u32 blk_offset = 0; >>> int ret; >>> >>> if (IS_DATASEG(type)) { >>> @@ -2160,24 +2161,29 @@ static void read_normal_summaries(struct f2fs_sb_info *sbi, int type) >>> blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type); >>> } else { >>> segno = get_cp(cur_node_segno[type - CURSEG_HOT_NODE]); >>> - if (is_set_ckpt_flags(cp, CP_UMOUNT_FLAG)) >>> + if (is_set_ckpt_flags(cp, CP_UMOUNT_FLAG)) { >>> blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE, >>> type - CURSEG_HOT_NODE); >>> - else >>> + } else { >>> blk_addr = GET_SUM_BLKADDR(sbi, segno); >>> + blk_offset = GET_SUM_BLKOFF(segno); >>> + } >>> } >>> >>> - sum_blk = malloc(F2FS_BLKSIZE); >>> + sum_blk = malloc(F2FS_SUM_BLKSIZE); >>> ASSERT(sum_blk); >>> >>> - ret = dev_read_block(sum_blk, blk_addr); >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + ret = dev_read_4k_block(sum_blk, blk_addr, blk_offset); >>> + else >>> + ret = dev_read_block(sum_blk, blk_addr); >>> ASSERT(ret >= 0); >>> >>> if (IS_NODESEG(type) && !is_set_ckpt_flags(cp, CP_UMOUNT_FLAG)) >>> restore_node_summary(sbi, segno, sum_blk); >>> >>> curseg = CURSEG_I(sbi, type); >>> - memcpy(curseg->sum_blk, sum_blk, F2FS_BLKSIZE); >>> + memcpy(curseg->sum_blk, sum_blk, F2FS_SUM_BLKSIZE); >>> reset_curseg(sbi, type); >>> free(sum_blk); >>> } >>> @@ -2205,8 +2211,7 @@ void update_sum_entry(struct f2fs_sb_info *sbi, block_t blk_addr, >>> SUM_TYPE_DATA; >>> >>> /* write SSA all the time */ >>> - ret = dev_write_block(sum_blk, GET_SUM_BLKADDR(sbi, segno), >>> - WRITE_LIFE_NONE); >>> + ret = write_sum_block(sbi, sum_blk, segno, WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> >>> if (type == SEG_TYPE_NODE || type == SEG_TYPE_DATA || >>> @@ -2244,7 +2249,7 @@ static int build_curseg(struct f2fs_sb_info *sbi) >>> SM_I(sbi)->curseg_array = array; >>> >>> for (i = 0; i < NR_CURSEG_TYPE; i++) { >>> - array[i].sum_blk = calloc(F2FS_BLKSIZE, 1); >>> + array[i].sum_blk = calloc(F2FS_SUM_BLKSIZE, 1); >>> if (!array[i].sum_blk) { >>> MSG(1, "\tError: Calloc failed for build_curseg!!\n"); >>> goto seg_cleanup; >>> @@ -2405,11 +2410,9 @@ struct f2fs_summary_block *get_sum_block(struct f2fs_sb_info *sbi, >>> struct f2fs_summary_block *sum_blk; >>> struct curseg_info *curseg; >>> int type, ret; >>> - u64 ssa_blk; >>> >>> *ret_type= SEG_TYPE_MAX; >>> >>> - ssa_blk = GET_SUM_BLKADDR(sbi, segno); >>> for (type = 0; type < NR_CURSEG_NODE_TYPE; type++) { >>> curseg = CURSEG_I(sbi, CURSEG_HOT_NODE + type); >>> if (segno == curseg->segno) { >>> @@ -2440,10 +2443,10 @@ struct f2fs_summary_block *get_sum_block(struct f2fs_sb_info *sbi, >>> } >>> } >>> >>> - sum_blk = calloc(F2FS_BLKSIZE, 1); >>> + sum_blk = calloc(F2FS_SUM_BLKSIZE, 1); >>> ASSERT(sum_blk); >>> >>> - ret = dev_read_block(sum_blk, ssa_blk); >>> + ret = read_sum_block(sbi, sum_blk, segno); >>> ASSERT(ret >= 0); >>> >>> if (IS_SUM_NODE_SEG(sum_blk)) >>> @@ -3060,7 +3063,6 @@ int find_next_free_block(struct f2fs_sb_info *sbi, u64 *to, int left, >>> struct curseg_info *curseg = CURSEG_I(sbi, want_type); >>> unsigned int segs_per_zone = sbi->segs_per_sec * sbi->secs_per_zone; >>> char buf[F2FS_BLKSIZE]; >> >> char buf[F2FS_SUM_BLKSIZE]; > > Got it. > >> >>> - u64 ssa_blk; >>> int ret; >>> >>> *to = NEXT_FREE_BLKADDR(sbi, curseg); >>> @@ -3078,17 +3080,15 @@ int find_next_free_block(struct f2fs_sb_info *sbi, u64 *to, int left, >>> segno = GET_SEGNO(sbi, new_blkaddr); >>> } >>> >>> - ssa_blk = GET_SUM_BLKADDR(sbi, curseg->segno); >>> - ret = dev_write_block(curseg->sum_blk, ssa_blk, >>> - WRITE_LIFE_NONE); >>> + ret = write_sum_block(sbi, curseg->sum_blk, >>> + curseg->segno, WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> >>> curseg->segno = segno; >>> curseg->next_blkoff = 0; >>> curseg->alloc_type = LFS; >>> >>> - ssa_blk = GET_SUM_BLKADDR(sbi, curseg->segno); >>> - ret = dev_read_block(&buf, ssa_blk); >>> + ret = read_sum_block(sbi, &buf, curseg->segno); >>> ASSERT(ret >= 0); >>> >>> memcpy(curseg->sum_blk, &buf, SUM_ENTRIES_SIZE); >>> @@ -3166,7 +3166,7 @@ void move_one_curseg_info(struct f2fs_sb_info *sbi, u64 from, int left, >>> struct curseg_info *curseg = CURSEG_I(sbi, i); >>> char buf[F2FS_BLKSIZE]; >> >> char buf[F2FS_SUM_BLKSIZE]; > > Got it. > >> >>> u32 old_segno; >>> - u64 ssa_blk, to; >>> + u64 to; >>> int ret; >>> >>> if ((get_sb(feature) & F2FS_FEATURE_RO)) { >>> @@ -3184,8 +3184,8 @@ void move_one_curseg_info(struct f2fs_sb_info *sbi, u64 from, int left, >>> } >>> >>> /* update original SSA too */ >>> - ssa_blk = GET_SUM_BLKADDR(sbi, curseg->segno); >>> - ret = dev_write_block(curseg->sum_blk, ssa_blk, WRITE_LIFE_NONE); >>> + ret = write_sum_block(sbi, curseg->sum_blk, curseg->segno, >>> + WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> bypass_ssa: >>> to = from; >>> @@ -3199,8 +3199,7 @@ bypass_ssa: >>> curseg->alloc_type = c.zoned_model == F2FS_ZONED_HM ? LFS : SSR; >>> >>> /* update new segno */ >>> - ssa_blk = GET_SUM_BLKADDR(sbi, curseg->segno); >>> - ret = dev_read_block(buf, ssa_blk); >>> + ret = read_sum_block(sbi, buf, curseg->segno); >>> ASSERT(ret >= 0); >>> >>> memcpy(curseg->sum_blk, buf, SUM_ENTRIES_SIZE); >>> @@ -3464,7 +3463,6 @@ void write_checkpoint(struct f2fs_sb_info *sbi) >>> /* update summary blocks having nullified journal entries */ >>> for (i = 0; i < NO_CHECK_TYPE; i++) { >>> struct curseg_info *curseg = CURSEG_I(sbi, i); >>> - u64 ssa_blk; >>> >>> if (!(flags & CP_UMOUNT_FLAG) && IS_NODESEG(i)) >>> continue; >>> @@ -3475,9 +3473,8 @@ void write_checkpoint(struct f2fs_sb_info *sbi) >>> >>> if (!(get_sb(feature) & F2FS_FEATURE_RO)) { >>> /* update original SSA too */ >>> - ssa_blk = GET_SUM_BLKADDR(sbi, curseg->segno); >>> - ret = dev_write_block(curseg->sum_blk, ssa_blk, >>> - WRITE_LIFE_NONE); >>> + ret = write_sum_block(sbi, curseg->sum_blk, >>> + curseg->segno, WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> } >>> } >>> diff --git a/fsck/resize.c b/fsck/resize.c >>> index bef05d6..e650283 100644 >>> --- a/fsck/resize.c >>> +++ b/fsck/resize.c >>> @@ -115,7 +115,11 @@ static int get_new_sb(struct f2fs_super_block *sb) >>> get_sb(segment_count_sit) + >>> get_sb(segment_count_nat))) * blks_per_seg; >>> >>> - blocks_for_ssa = total_valid_blks_available / blks_per_seg + 1; >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + blocks_for_ssa = round_up(total_valid_blks_available / blks_per_seg, >>> + SUMS_PER_BLOCK); >>> + else >>> + blocks_for_ssa = total_valid_blks_available / blks_per_seg + 1; >>> >>> set_sb(segment_count_ssa, SEG_ALIGN(blocks_for_ssa)); >>> >>> @@ -209,23 +213,36 @@ static void migrate_main(struct f2fs_sb_info *sbi, unsigned int offset) >>> START_BLOCK(sbi, 0) + offset); >>> } >>> >>> -static void move_ssa(struct f2fs_sb_info *sbi, unsigned int segno, >>> - block_t new_sum_blk_addr) >>> +#define GET_SUM_NEW_BLKADDR(new_sb, segno) \ >>> + (c.feature & F2FS_FEATURE_PACKED_SSA ? \ >>> + (get_newsb(ssa_blkaddr) + \ >>> + (segno >> (get_newsb(log_blocksize) - DEFAULT_BLKSIZE_BITS))) : \ >>> + (get_newsb(ssa_blkaddr) + segno)) >>> +#define GET_SUM_NEW_BLKOFF(new_sb, segno) \ >>> + (c.feature & F2FS_FEATURE_PACKED_SSA ? \ >>> + (segno % (1 << (get_newsb(log_blocksize) - DEFAULT_BLKSIZE_BITS))) : 0) >>> + >>> +static void move_ssa(struct f2fs_sb_info *sbi, struct f2fs_super_block *new_sb, >>> + unsigned int old_segno, unsigned int new_segno) >>> { >>> struct f2fs_summary_block *sum_blk; >>> int type; >>> >>> - sum_blk = get_sum_block(sbi, segno, &type); >>> + sum_blk = get_sum_block(sbi, old_segno, &type); >>> if (type < SEG_TYPE_MAX) { >>> int ret; >>> - >>> - ret = dev_write_block(sum_blk, new_sum_blk_addr, >>> - WRITE_LIFE_NONE); >>> + u64 new_blkaddr = GET_SUM_NEW_BLKADDR(new_sb, new_segno); >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + ret = dev_write_4k_block(sum_blk, new_blkaddr, >>> + GET_SUM_NEW_BLKOFF(new_sb, new_segno), >>> + WRITE_LIFE_NONE); >>> + else >>> + ret = dev_write_block(sum_blk, new_blkaddr, >>> + WRITE_LIFE_NONE); >>> ASSERT(ret >= 0); >>> DBG(1, "Write summary block: (%d) segno=%x/%x --> (%d) %x\n", >>> - type, segno, GET_SUM_BLKADDR(sbi, segno), >>> - IS_SUM_NODE_SEG(sum_blk), >>> - new_sum_blk_addr); >>> + type, old_segno, GET_SUM_BLKADDR(sbi, old_segno), >>> + IS_SUM_NODE_SEG(sum_blk), (unsigned int)new_blkaddr); >>> } >>> if (type == SEG_TYPE_NODE || type == SEG_TYPE_DATA || >>> type == SEG_TYPE_MAX) { >>> @@ -240,36 +257,48 @@ static void migrate_ssa(struct f2fs_sb_info *sbi, >>> struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi); >>> block_t old_sum_blkaddr = get_sb(ssa_blkaddr); >>> block_t new_sum_blkaddr = get_newsb(ssa_blkaddr); >>> - block_t end_sum_blkaddr = get_newsb(main_blkaddr); >>> - block_t expand_sum_blkaddr = new_sum_blkaddr + >>> - MAIN_SEGS(sbi) - offset; >>> - block_t blkaddr; >>> - int ret; >>> - void *zero_block = calloc(F2FS_BLKSIZE, 1); >>> + unsigned int expand_segno = MAIN_SEGS(sbi) - offset; >>> + unsigned int new_seg_total = get_newsb(segment_count); >>> + int new_segno; >>> + int ret = 0; >>> + void *zero_block = calloc(F2FS_SUM_BLKSIZE, 1); >>> ASSERT(zero_block); >>> >>> - if (offset && new_sum_blkaddr < old_sum_blkaddr + offset) { >>> - blkaddr = new_sum_blkaddr; >>> - while (blkaddr < end_sum_blkaddr) { >>> - if (blkaddr < expand_sum_blkaddr) { >>> - move_ssa(sbi, offset++, blkaddr++); >>> - } else { >>> - ret = dev_write_block(zero_block, blkaddr++, >>> - WRITE_LIFE_NONE); >>> - ASSERT(ret >=0); >>> - } >>> + if (offset && new_sum_blkaddr <= (old_sum_blkaddr + >>> + offset / SUMS_PER_BLOCK)) { >>> + new_segno = 0; >>> + while (new_segno < new_seg_total) { >>> + if (new_segno < expand_segno) >>> + move_ssa(sbi, new_sb, offset++, new_segno); >>> + else if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + ret = dev_write_4k_block(zero_block, >>> + GET_SUM_NEW_BLKADDR(new_sb, new_segno), >>> + GET_SUM_NEW_BLKOFF(new_sb, new_segno), >>> + WRITE_LIFE_NONE); >>> + else >>> + ret = dev_write_block(zero_block, >>> + GET_SUM_NEW_BLKADDR(new_sb, new_segno), >>> + WRITE_LIFE_NONE); >>> + ASSERT(ret >= 0); >>> + new_segno++; >>> } >>> } else { >>> - blkaddr = end_sum_blkaddr - 1; >>> + new_segno = new_seg_total - 1; >>> offset = MAIN_SEGS(sbi) - 1; >>> - while (blkaddr >= new_sum_blkaddr) { >>> - if (blkaddr >= expand_sum_blkaddr) { >>> - ret = dev_write_block(zero_block, blkaddr--, >>> - WRITE_LIFE_NONE); >>> - ASSERT(ret >=0); >>> - } else { >>> - move_ssa(sbi, offset--, blkaddr--); >>> - } >>> + while (new_segno >= 0) { >>> + if (new_segno < expand_segno) >>> + move_ssa(sbi, new_sb, offset--, new_segno); >>> + else if (c.feature & F2FS_FEATURE_PACKED_SSA) >>> + ret = dev_write_4k_block(zero_block, >>> + GET_SUM_NEW_BLKADDR(new_sb, new_segno), >>> + GET_SUM_NEW_BLKOFF(new_sb, new_segno), >>> + WRITE_LIFE_NONE); >>> + else >>> + ret = dev_write_block(zero_block, >>> + GET_SUM_NEW_BLKADDR(new_sb, new_segno), >>> + WRITE_LIFE_NONE); >>> + ASSERT(ret >= 0); >>> + new_segno--; >>> } >>> } >>> >>> diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h >>> index b85ded2..83e1484 100644 >>> --- a/include/f2fs_fs.h >>> +++ b/include/f2fs_fs.h >>> @@ -655,6 +655,7 @@ enum { >>> #define F2FS_MIN_BLKSIZE 4096 >>> #define F2FS_MAX_BLKSIZE 16384 >>> #define F2FS_BLKSIZE c.blksize /* support configurable block size */ >>> +#define F2FS_SUM_BLKSIZE ((c.feature & F2FS_FEATURE_PACKED_SSA) ? 4096 : F2FS_BLKSIZE) >> >> How about using F2FS_MIN_BLKSIZE instead of all magic number 4096? > > Got it. > >> >>> #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ >>> #define F2FS_EXTENSION_LEN 8 /* max size of extension */ >>> #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE) >>> @@ -715,6 +716,7 @@ enum { >>> #define F2FS_FEATURE_COMPRESSION 0x2000 >>> #define F2FS_FEATURE_RO 0x4000 >>> #define F2FS_FEATURE_DEVICE_ALIAS 0x8000 >>> +#define F2FS_FEATURE_PACKED_SSA 0x10000 >>> >>> #define MAX_NR_FEATURE 32 >>> >>> @@ -1219,7 +1221,7 @@ struct f2fs_sit_block { >>> * from node's page's beginning to get a data block address. >>> * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) >>> */ >>> -#define ENTRIES_IN_SUM (F2FS_BLKSIZE / 8) >>> +#define ENTRIES_IN_SUM (F2FS_SUM_BLKSIZE / 8) >>> #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ >>> #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ >>> #define SUM_ENTRIES_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) >>> @@ -1249,7 +1251,7 @@ struct summary_footer { >>> >>> static_assert(sizeof(struct summary_footer) == 5, ""); >>> >>> -#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ >>> +#define SUM_JOURNAL_SIZE (F2FS_SUM_BLKSIZE - SUM_FOOTER_SIZE -\ >>> SUM_ENTRIES_SIZE) >>> #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ >>> sizeof(struct nat_journal_entry)) >>> @@ -1348,7 +1350,7 @@ struct f2fs_summary_block { >>> }; >>> #define F2FS_SUMMARY_BLOCK_JOURNAL(blk) ((struct f2fs_journal *)(&(blk)->entries[ENTRIES_IN_SUM])) >>> #define F2FS_SUMMARY_BLOCK_FOOTER(blk) ((struct summary_footer *)&((char *)\ >>> - (&(blk)->entries[0]))[F2FS_BLKSIZE - SUM_FOOTER_SIZE]) >>> + (&(blk)->entries[0]))[F2FS_SUM_BLKSIZE - SUM_FOOTER_SIZE]) >>> >>> /* >>> * For directory operations >>> @@ -1711,6 +1713,8 @@ extern int dev_fill_block(void *, __u64, enum rw_hint); >>> >>> extern int dev_read_block(void *, __u64); >>> extern int dev_reada_block(__u64); >>> +extern int dev_write_4k_block(void *, __u64, __u32, enum rw_hint); >>> +extern int dev_read_4k_block(void *, __u64, __u32); >>> >>> extern int dev_read_version(void *, __u64, size_t); >>> extern void get_kernel_version(__u8 *); >>> @@ -2022,6 +2026,7 @@ struct feature feature_table[] = { \ >>> { "compression", F2FS_FEATURE_COMPRESSION, 1}, \ >>> { "ro", F2FS_FEATURE_RO, 1}, \ >>> { "device_alias", F2FS_FEATURE_DEVICE_ALIAS, 0}, \ >>> + { "packed_ssa", F2FS_FEATURE_PACKED_SSA, 1}, \ >> >> ^ >> IIUC, this feature can not be tunned by fsck? since it will change the disk layout? > > We need to turn on/off with the mkfs option. Can we set/clear in > superblock with fsck? Oh, I missed to check tune_sb_features(), fsck can only set encrypt/casefold feature rather than all features w/ settable field == 1. Thanks, > >> >> Thanks, >> >>> { NULL, 0x0, 0}, \ >>> }; >>> >>> @@ -2161,18 +2166,18 @@ static inline void check_block_struct_sizes(void) >>> assert(sizeof(struct f2fs_summary) * ENTRIES_IN_SUM >>> + offsetof(struct f2fs_journal, nat_j) >>> + NAT_JOURNAL_ENTRIES * sizeof(struct nat_journal_entry) >>> - + NAT_JOURNAL_RESERVED + sizeof(struct summary_footer) == F2FS_BLKSIZE); >>> + + NAT_JOURNAL_RESERVED + sizeof(struct summary_footer) == F2FS_SUM_BLKSIZE); >>> >>> /* Check SIT Journal Block Size */ >>> assert(sizeof(struct f2fs_summary) * ENTRIES_IN_SUM >>> + offsetof(struct f2fs_journal, sit_j) >>> + SIT_JOURNAL_ENTRIES * sizeof(struct sit_journal_entry) >>> - + SIT_JOURNAL_RESERVED + sizeof(struct summary_footer) == F2FS_BLKSIZE); >>> + + SIT_JOURNAL_RESERVED + sizeof(struct summary_footer) == F2FS_SUM_BLKSIZE); >>> >>> /* Check Info Journal Block Size */ >>> assert(sizeof(struct f2fs_summary) * ENTRIES_IN_SUM + sizeof(__le64) >>> + offsetof(struct f2fs_journal, info) >>> - + EXTRA_INFO_RESERVED + sizeof(struct summary_footer) == F2FS_BLKSIZE); >>> + + EXTRA_INFO_RESERVED + sizeof(struct summary_footer) == F2FS_SUM_BLKSIZE); >>> >>> /* Check Dentry Block Size */ >>> assert(sizeof(__u8) * (SIZE_OF_DENTRY_BITMAP + SIZE_OF_RESERVED) >>> diff --git a/lib/libf2fs_io.c b/lib/libf2fs_io.c >>> index c31f3b8..deafc4f 100644 >>> --- a/lib/libf2fs_io.c >>> +++ b/lib/libf2fs_io.c >>> @@ -734,6 +734,18 @@ int dev_reada_block(__u64 blk_addr) >>> return dev_readahead(blk_addr << F2FS_BLKSIZE_BITS, F2FS_BLKSIZE); >>> } >>> >>> +int dev_write_4k_block(void *buf, __u64 blk_addr, __u32 offset, enum rw_hint whint) >>> +{ >>> + return dev_write(buf, (blk_addr << F2FS_BLKSIZE_BITS) + offset * 4096, >>> + 4096, whint); >>> +} >>> + >>> +int dev_read_4k_block(void *buf, __u64 blk_addr, __u32 offset) >>> +{ >>> + return dev_read(buf, (blk_addr << F2FS_BLKSIZE_BITS) + offset * 4096, >>> + 4096); >>> +} >>> + >>> int f2fs_fsync_device(void) >>> { >>> #ifdef HAVE_FSYNC >>> diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c >>> index d05e897..b3dccd0 100644 >>> --- a/mkfs/f2fs_format.c >>> +++ b/mkfs/f2fs_format.c >>> @@ -500,8 +500,16 @@ static int f2fs_prepare_super_block(void) >>> if (c.feature & F2FS_FEATURE_RO) { >>> blocks_for_ssa = 0; >>> } else { >>> + unsigned int ssa_per_block; >>> + >>> ASSERT((total_valid_blks_available % c.blks_per_seg) == 0); >>> - blocks_for_ssa = total_valid_blks_available / c.blks_per_seg; >>> + if (c.feature & F2FS_FEATURE_PACKED_SSA) { >>> + ssa_per_block = c.blksize / F2FS_SUM_BLKSIZE; >>> + blocks_for_ssa = round_up(total_valid_blks_available / >>> + c.blks_per_seg, ssa_per_block); >>> + } else { >>> + blocks_for_ssa = total_valid_blks_available / c.blks_per_seg; >>> + } >>> } >>> >>> set_sb(segment_count_ssa, SEG_ALIGN(blocks_for_ssa)); >>> diff --git a/mkfs/f2fs_format_main.c b/mkfs/f2fs_format_main.c >>> index 8f8e975..8d44a9b 100644 >>> --- a/mkfs/f2fs_format_main.c >>> +++ b/mkfs/f2fs_format_main.c >>> @@ -380,6 +380,12 @@ static void f2fs_parse_options(int argc, char *argv[]) >>> } >>> } >>> >>> + if ((c.feature & F2FS_FEATURE_PACKED_SSA) && >>> + (c.blksize == F2FS_MIN_BLKSIZE)) { >>> + c.feature &= ~F2FS_FEATURE_PACKED_SSA; >>> + MSG(0, "\tInfo: packed_ssa feature is disabled for 4k block.\n"); >>> + } >>> + >>> if (optind >= argc) { >>> MSG(0, "\tError: Device not specified\n"); >>> mkfs_usage(); >>