Re: [PATCH v2] mkfs.f2fs: expand scalability of nat bitmap

From: Jaegeuk Kim
Date: Tue Jan 23 2018 - 21:39:40 EST

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In reply to: Chao Yu: "Re: [PATCH v2] mkfs.f2fs: expand scalability of nat bitmap"
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On 01/24, Chao Yu wrote:
> On 2018/1/24 10:22, Jaegeuk Kim wrote:
> > On 01/24, Chao Yu wrote:
> >> On 2018/1/24 6:19, Jaegeuk Kim wrote:
> >>> On 01/23, Jaegeuk Kim wrote:
> >>>> On 01/23, Chao Yu wrote:
> >>>>> On 2018/1/23 7:00, Jaegeuk Kim wrote:
> >>>>>> On 01/17, Chao Yu wrote:
> >>>>>>> Hi Jaegeuk,
> >>>>>>>
> >>>>>>> On 2018/1/17 8:47, Jaegeuk Kim wrote:
> >>>>>>>> Hi Chao,
> >>>>>>>>
> >>>>>>>> On 01/15, Chao Yu wrote:
> >>>>>>>>> Previously, our total node number (nat_bitmap) and total nat segment count
> >>>>>>>>> will not monotonously increase along with image size, and max nat_bitmap size
> >>>>>>>>> is limited by "CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1", it is
> >>>>>>>>> with bad scalability when user wants to create more inode/node in larger image.
> >>>>>>>>>
> >>>>>>>>> So this patch tries to relieve the limitation, by default, limitting total nat
> >>>>>>>>> entry number with 20% of total block number.
> >>>>>>>>>
> >>>>>>>>> Before:
> >>>>>>>>> image_size(GB) nat_bitmap sit_bitmap nat_segment sit_segment
> >>>>>>>>> 16 3836 64 36 2
> >>>>>>>>> 32 3836 64 72 2
> >>>>>>>>> 64 3772 128 116 4
> >>>>>>>>> 128 3708 192 114 6
> >>>>>>>>> 256 3580 320 110 10
> >>>>>>>
> >>>>>>> As you see, nat_segment count will reduce when image size increases
> >>>>>>> starting from 64GB, that means nat segment count will not monotonously
> >>>>>>> increase when image size is increasing, so it would be better to active
> >>>>>>> this when image size is larger than 32GB?
> >>>>>>>
> >>>>>>> IMO, configuring basic nid ratio to fixed value like ext4 ("free inode" :
> >>>>>>> "free block" is about 1 : 4) would be better:
> >>>>>>> a. It will be easy for user to predict nid count or nat segment count with
> >>>>>>> fix-sized image;
> >>>>>>> b. If user wants to reserve more nid count, we can support -N option in
> >>>>>>> mkfs.f2fs to specify total nid count as user wish.
> >>>>>>
> >>>>>> My concern is about a CTS failure in terms of # of free inodes.
> >>>>>
> >>>>> You mean testSaneInodes()?
> >>>>>
> >>>>> final long maxsize = stat.f_blocks * stat.f_frsize;
> >>>>> final long maxInodes = maxsize / 4096;
> >>>>> final long minsize = stat.f_bavail * stat.f_frsize;
> >>>>> final long minInodes = minsize / 32768;
> >>>>>
> >>>>> The range is about [1/8, 1], so our 20% threshold can just let it passed,
> >>>>> right?
> >>>>
> >>>> Yes, thanks for checking the codes. Let me play with this for some time.
> >>>
> >>> It simply triggers a panic, if kernel does not have the patch to detect the
> >>> feature. Hmm...
> >>
> >> Yes, because we have changed disk layout of nat/sit_version_bitmap in
> >> mkfs.f2fs, if kernel can not detect that, we will encounter panic simply.
> >
> > , which means we can't do this by default at least.
>
> Oh, right, we need to consider to keep backward compactibility for old
> kernel in mkfs.f2fs by default, what about adding a new option to enable
> this just for new kernel?

I guess it'd be possible, and we must warn the user when setting this.

>
> Thanks,
>
> >
> >>
> >> Thanks,
> >>
> >>>
> >>> Thanks,
> >>>
> >>>>
> >>>> Thanks,
> >>>>
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>>>
> >>>>>> Thanks,
> >>>>>>
> >>>>>>>
> >>>>>>> How do you think?
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>>
> >>>>>>>>> 512 3260 640 100 20
> >>>>>>>>> 1024 2684 1216 82 38
> >>>>>>>>> 2048 1468 2432 44 76
> >>>>>>>>> 4096 3900 4800 120 150
> >>>>>>>>>
> >>>>>>>>> After:
> >>>>>>>>> image_size(GB) nat_bitmap sit_bitmap nat_segment sit_segment
> >>>>>>>>> 16 256 64 8 2
> >>>>>>>>> 32 512 64 16 2
> >>>>>>>>> 64 960 128 30 4
> >>>>>>>>> 128 1856 192 58 6
> >>>>>>>>> 256 3712 320 116 10
> >>>>>>>>
> >>>>>>>> Can we activate this, if size is larger than 256GB or something around that?
> >>>>>>>>
> >>>>>>>> Thanks,
> >>>>>>>>
> >>>>>>>>> 512 7424 640 232 20
> >>>>>>>>> 1024 14787 1216 462 38
> >>>>>>>>> 2048 29504 2432 922 76
> >>>>>>>>> 4096 59008 4800 1844 150
> >>>>>>>>>
> >>>>>>>>> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
> >>>>>>>>> ---
> >>>>>>>>> v2:
> >>>>>>>>> - add CP_LARGE_NAT_BITMAP_FLAG flag to indicate new layout of nat/sit bitmap.
> >>>>>>>>> fsck/f2fs.h | 19 +++++++++++++------
> >>>>>>>>> fsck/resize.c | 35 +++++++++++++++++------------------
> >>>>>>>>> include/f2fs_fs.h | 8 ++++++--
> >>>>>>>>> lib/libf2fs.c | 1 +
> >>>>>>>>> mkfs/f2fs_format.c | 45 +++++++++++++++++++++++----------------------
> >>>>>>>>> 5 files changed, 60 insertions(+), 48 deletions(-)
> >>>>>>>>>
> >>>>>>>>> diff --git a/fsck/f2fs.h b/fsck/f2fs.h
> >>>>>>>>> index f5970d9dafc0..8a5ce365282d 100644
> >>>>>>>>> --- a/fsck/f2fs.h
> >>>>>>>>> +++ b/fsck/f2fs.h
> >>>>>>>>> @@ -239,6 +239,12 @@ static inline unsigned int ofs_of_node(struct f2fs_node *node_blk)
> >>>>>>>>> return flag >> OFFSET_BIT_SHIFT;
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> +static inline bool is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
> >>>>>>>>> +{
> >>>>>>>>> + unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
> >>>>>>>>> + return ckpt_flags & f ? 1 : 0;
> >>>>>>>>> +}
> >>>>>>>>> +
> >>>>>>>>> static inline unsigned long __bitmap_size(struct f2fs_sb_info *sbi, int flag)
> >>>>>>>>> {
> >>>>>>>>> struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
> >>>>>>>>> @@ -256,6 +262,13 @@ static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
> >>>>>>>>> {
> >>>>>>>>> struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
> >>>>>>>>> int offset;
> >>>>>>>>> +
> >>>>>>>>> + if (is_set_ckpt_flags(ckpt, CP_LARGE_NAT_BITMAP_FLAG)) {
> >>>>>>>>> + offset = (flag == SIT_BITMAP) ?
> >>>>>>>>> + le32_to_cpu(ckpt->nat_ver_bitmap_bytesize) : 0;
> >>>>>>>>> + return &ckpt->sit_nat_version_bitmap + offset;
> >>>>>>>>> + }
> >>>>>>>>> +
> >>>>>>>>> if (le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload) > 0) {
> >>>>>>>>> if (flag == NAT_BITMAP)
> >>>>>>>>> return &ckpt->sit_nat_version_bitmap;
> >>>>>>>>> @@ -268,12 +281,6 @@ static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
> >>>>>>>>> }
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> -static inline bool is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
> >>>>>>>>> -{
> >>>>>>>>> - unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
> >>>>>>>>> - return ckpt_flags & f ? 1 : 0;
> >>>>>>>>> -}
> >>>>>>>>> -
> >>>>>>>>> static inline block_t __start_cp_addr(struct f2fs_sb_info *sbi)
> >>>>>>>>> {
> >>>>>>>>> block_t start_addr = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_blkaddr);
> >>>>>>>>> diff --git a/fsck/resize.c b/fsck/resize.c
> >>>>>>>>> index 143ad5d3c0a1..f3547c86f351 100644
> >>>>>>>>> --- a/fsck/resize.c
> >>>>>>>>> +++ b/fsck/resize.c
> >>>>>>>>> @@ -13,10 +13,10 @@ static int get_new_sb(struct f2fs_super_block *sb)
> >>>>>>>>> {
> >>>>>>>>> u_int32_t zone_size_bytes, zone_align_start_offset;
> >>>>>>>>> u_int32_t blocks_for_sit, blocks_for_nat, blocks_for_ssa;
> >>>>>>>>> - u_int32_t sit_segments, diff, total_meta_segments;
> >>>>>>>>> + u_int32_t sit_segments, nat_segments, diff, total_meta_segments;
> >>>>>>>>> u_int32_t total_valid_blks_available;
> >>>>>>>>> u_int32_t sit_bitmap_size, max_sit_bitmap_size;
> >>>>>>>>> - u_int32_t max_nat_bitmap_size, max_nat_segments;
> >>>>>>>>> + u_int32_t max_nat_bitmap_size;
> >>>>>>>>> u_int32_t segment_size_bytes = 1 << (get_sb(log_blocksize) +
> >>>>>>>>> get_sb(log_blocks_per_seg));
> >>>>>>>>> u_int32_t blks_per_seg = 1 << get_sb(log_blocks_per_seg);
> >>>>>>>>> @@ -47,7 +47,15 @@ static int get_new_sb(struct f2fs_super_block *sb)
> >>>>>>>>> get_sb(segment_count_sit))) * blks_per_seg;
> >>>>>>>>> blocks_for_nat = SIZE_ALIGN(total_valid_blks_available,
> >>>>>>>>> NAT_ENTRY_PER_BLOCK);
> >>>>>>>>> - set_sb(segment_count_nat, SEG_ALIGN(blocks_for_nat));
> >>>>>>>>> + nat_segments = SEG_ALIGN(blocks_for_nat) *
> >>>>>>>>> + DEFAULT_NAT_ENTRY_RATIO / 100;
> >>>>>>>>> + set_sb(segment_count_nat, nat_segments ? nat_segments : 1);
> >>>>>>>>> +
> >>>>>>>>> + max_nat_bitmap_size = (get_sb(segment_count_nat) <<
> >>>>>>>>> + get_sb(log_blocks_per_seg)) / 8;
> >>>>>>>>> + set_sb(segment_count_nat, get_sb(segment_count_nat) * 2);
> >>>>>>>>> +
> >>>>>>>>> + c.large_nat_bitmap = 1;
> >>>>>>>>>
> >>>>>>>>> sit_bitmap_size = ((get_sb(segment_count_sit) / 2) <<
> >>>>>>>>> get_sb(log_blocks_per_seg)) / 8;
> >>>>>>>>> @@ -56,25 +64,16 @@ static int get_new_sb(struct f2fs_super_block *sb)
> >>>>>>>>> else
> >>>>>>>>> max_sit_bitmap_size = sit_bitmap_size;
> >>>>>>>>>
> >>>>>>>>> - /*
> >>>>>>>>> - * It should be reserved minimum 1 segment for nat.
> >>>>>>>>> - * When sit is too large, we should expand cp area. It requires more pages for cp.
> >>>>>>>>> - */
> >>>>>>>>> - if (max_sit_bitmap_size > MAX_SIT_BITMAP_SIZE_IN_CKPT) {
> >>>>>>>>> - max_nat_bitmap_size = CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1;
> >>>>>>>>> - set_sb(cp_payload, F2FS_BLK_ALIGN(max_sit_bitmap_size));
> >>>>>>>>> + /* use cp_payload if free space of f2fs_checkpoint is not enough */
> >>>>>>>>> + if (max_sit_bitmap_size + max_nat_bitmap_size >
> >>>>>>>>> + MAX_BITMAP_SIZE_IN_CKPT) {
> >>>>>>>>> + u_int32_t diff = max_sit_bitmap_size + max_nat_bitmap_size -
> >>>>>>>>> + MAX_BITMAP_SIZE_IN_CKPT;
> >>>>>>>>> + set_sb(cp_payload, F2FS_BLK_ALIGN(diff));
> >>>>>>>>> } else {
> >>>>>>>>> - max_nat_bitmap_size = CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1
> >>>>>>>>> - - max_sit_bitmap_size;
> >>>>>>>>> set_sb(cp_payload, 0);
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> - max_nat_segments = (max_nat_bitmap_size * 8) >>
> >>>>>>>>> - get_sb(log_blocks_per_seg);
> >>>>>>>>> -
> >>>>>>>>> - if (get_sb(segment_count_nat) > max_nat_segments)
> >>>>>>>>> - set_sb(segment_count_nat, max_nat_segments);
> >>>>>>>>> -
> >>>>>>>>> set_sb(segment_count_nat, get_sb(segment_count_nat) * 2);
> >>>>>>>>>
> >>>>>>>>> set_sb(ssa_blkaddr, get_sb(nat_blkaddr) +
> >>>>>>>>> diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
> >>>>>>>>> index 4739085ed98f..edf351412702 100644
> >>>>>>>>> --- a/include/f2fs_fs.h
> >>>>>>>>> +++ b/include/f2fs_fs.h
> >>>>>>>>> @@ -362,6 +362,7 @@ struct f2fs_configuration {
> >>>>>>>>> int preen_mode;
> >>>>>>>>> int ro;
> >>>>>>>>> int preserve_limits; /* preserve quota limits */
> >>>>>>>>> + int large_nat_bitmap;
> >>>>>>>>> __le32 feature; /* defined features */
> >>>>>>>>>
> >>>>>>>>> /* defragmentation parameters */
> >>>>>>>>> @@ -613,6 +614,7 @@ struct f2fs_super_block {
> >>>>>>>>> /*
> >>>>>>>>> * For checkpoint
> >>>>>>>>> */
> >>>>>>>>> +#define CP_LARGE_NAT_BITMAP_FLAG 0x00000200
> >>>>>>>>> #define CP_TRIMMED_FLAG 0x00000100
> >>>>>>>>> #define CP_NAT_BITS_FLAG 0x00000080
> >>>>>>>>> #define CP_CRC_RECOVERY_FLAG 0x00000040
> >>>>>>>>> @@ -657,8 +659,8 @@ struct f2fs_checkpoint {
> >>>>>>>>> unsigned char sit_nat_version_bitmap[1];
> >>>>>>>>> } __attribute__((packed));
> >>>>>>>>>
> >>>>>>>>> -#define MAX_SIT_BITMAP_SIZE_IN_CKPT \
> >>>>>>>>> - (CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1 - 64)
> >>>>>>>>> +#define MAX_BITMAP_SIZE_IN_CKPT \
> >>>>>>>>> + (CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1)
> >>>>>>>>>
> >>>>>>>>> /*
> >>>>>>>>> * For orphan inode management
> >>>>>>>>> @@ -846,6 +848,8 @@ struct f2fs_node {
> >>>>>>>>> #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
> >>>>>>>>> #define NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK)
> >>>>>>>>>
> >>>>>>>>> +#define DEFAULT_NAT_ENTRY_RATIO 20
> >>>>>>>>> +
> >>>>>>>>> #ifdef ANDROID_WINDOWS_HOST
> >>>>>>>>> #pragma pack(1)
> >>>>>>>>> #endif
> >>>>>>>>> diff --git a/lib/libf2fs.c b/lib/libf2fs.c
> >>>>>>>>> index ffdbccb34627..e8b1842b7391 100644
> >>>>>>>>> --- a/lib/libf2fs.c
> >>>>>>>>> +++ b/lib/libf2fs.c
> >>>>>>>>> @@ -623,6 +623,7 @@ void f2fs_init_configuration(void)
> >>>>>>>>> c.ro = 0;
> >>>>>>>>> c.kd = -1;
> >>>>>>>>> c.dry_run = 0;
> >>>>>>>>> + c.large_nat_bitmap = 0;
> >>>>>>>>> c.fixed_time = -1;
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
> >>>>>>>>> index a13000184300..23eaf40c5962 100644
> >>>>>>>>> --- a/mkfs/f2fs_format.c
> >>>>>>>>> +++ b/mkfs/f2fs_format.c
> >>>>>>>>> @@ -151,13 +151,13 @@ static int f2fs_prepare_super_block(void)
> >>>>>>>>> u_int32_t log_sectorsize, log_sectors_per_block;
> >>>>>>>>> u_int32_t log_blocksize, log_blks_per_seg;
> >>>>>>>>> u_int32_t segment_size_bytes, zone_size_bytes;
> >>>>>>>>> - u_int32_t sit_segments;
> >>>>>>>>> + u_int32_t sit_segments, nat_segments;
> >>>>>>>>> u_int32_t blocks_for_sit, blocks_for_nat, blocks_for_ssa;
> >>>>>>>>> u_int32_t total_valid_blks_available;
> >>>>>>>>> u_int64_t zone_align_start_offset, diff;
> >>>>>>>>> u_int64_t total_meta_zones, total_meta_segments;
> >>>>>>>>> u_int32_t sit_bitmap_size, max_sit_bitmap_size;
> >>>>>>>>> - u_int32_t max_nat_bitmap_size, max_nat_segments;
> >>>>>>>>> + u_int32_t max_nat_bitmap_size;
> >>>>>>>>> u_int32_t total_zones;
> >>>>>>>>> u_int32_t next_ino;
> >>>>>>>>> enum quota_type qtype;
> >>>>>>>>> @@ -272,7 +272,18 @@ static int f2fs_prepare_super_block(void)
> >>>>>>>>> blocks_for_nat = SIZE_ALIGN(total_valid_blks_available,
> >>>>>>>>> NAT_ENTRY_PER_BLOCK);
> >>>>>>>>>
> >>>>>>>>> - set_sb(segment_count_nat, SEG_ALIGN(blocks_for_nat));
> >>>>>>>>> + nat_segments = SEG_ALIGN(blocks_for_nat) *
> >>>>>>>>> + DEFAULT_NAT_ENTRY_RATIO / 100;
> >>>>>>>>> +
> >>>>>>>>> + set_sb(segment_count_nat, nat_segments ? nat_segments : 1);
> >>>>>>>>> +
> >>>>>>>>> + max_nat_bitmap_size = (get_sb(segment_count_nat) <<
> >>>>>>>>> + log_blks_per_seg) / 8;
> >>>>>>>>> +
> >>>>>>>>> + set_sb(segment_count_nat, get_sb(segment_count_nat) * 2);
> >>>>>>>>> +
> >>>>>>>>> + c.large_nat_bitmap = 1;
> >>>>>>>>> +
> >>>>>>>>> /*
> >>>>>>>>> * The number of node segments should not be exceeded a "Threshold".
> >>>>>>>>> * This number resizes NAT bitmap area in a CP page.
> >>>>>>>>> @@ -286,29 +297,16 @@ static int f2fs_prepare_super_block(void)
> >>>>>>>>> else
> >>>>>>>>> max_sit_bitmap_size = sit_bitmap_size;
> >>>>>>>>>
> >>>>>>>>> - /*
> >>>>>>>>> - * It should be reserved minimum 1 segment for nat.
> >>>>>>>>> - * When sit is too large, we should expand cp area. It requires more
> >>>>>>>>> - * pages for cp.
> >>>>>>>>> - */
> >>>>>>>>> - if (max_sit_bitmap_size > MAX_SIT_BITMAP_SIZE_IN_CKPT) {
> >>>>>>>>> - max_nat_bitmap_size = CHECKSUM_OFFSET -
> >>>>>>>>> - sizeof(struct f2fs_checkpoint) + 1;
> >>>>>>>>> - set_sb(cp_payload, F2FS_BLK_ALIGN(max_sit_bitmap_size));
> >>>>>>>>> + /* use cp_payload if free space of f2fs_checkpoint is not enough */
> >>>>>>>>> + if (max_sit_bitmap_size + max_nat_bitmap_size >
> >>>>>>>>> + MAX_BITMAP_SIZE_IN_CKPT) {
> >>>>>>>>> + u_int32_t diff = max_sit_bitmap_size + max_nat_bitmap_size -
> >>>>>>>>> + MAX_BITMAP_SIZE_IN_CKPT;
> >>>>>>>>> + set_sb(cp_payload, F2FS_BLK_ALIGN(diff));
> >>>>>>>>> } else {
> >>>>>>>>> - max_nat_bitmap_size =
> >>>>>>>>> - CHECKSUM_OFFSET - sizeof(struct f2fs_checkpoint) + 1
> >>>>>>>>> - - max_sit_bitmap_size;
> >>>>>>>>> set_sb(cp_payload, 0);
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> - max_nat_segments = (max_nat_bitmap_size * 8) >> log_blks_per_seg;
> >>>>>>>>> -
> >>>>>>>>> - if (get_sb(segment_count_nat) > max_nat_segments)
> >>>>>>>>> - set_sb(segment_count_nat, max_nat_segments);
> >>>>>>>>> -
> >>>>>>>>> - set_sb(segment_count_nat, get_sb(segment_count_nat) * 2);
> >>>>>>>>> -
> >>>>>>>>> set_sb(ssa_blkaddr, get_sb(nat_blkaddr) + get_sb(segment_count_nat) *
> >>>>>>>>> c.blks_per_seg);
> >>>>>>>>>
> >>>>>>>>> @@ -622,6 +620,9 @@ static int f2fs_write_check_point_pack(void)
> >>>>>>>>> if (c.trimmed)
> >>>>>>>>> flags |= CP_TRIMMED_FLAG;
> >>>>>>>>>
> >>>>>>>>> + if (c.large_nat_bitmap)
> >>>>>>>>> + flags |= CP_LARGE_NAT_BITMAP_FLAG;
> >>>>>>>>> +
> >>>>>>>>> set_cp(ckpt_flags, flags);
> >>>>>>>>> set_cp(cp_pack_start_sum, 1 + get_sb(cp_payload));
> >>>>>>>>> set_cp(valid_node_count, 1 + quota_inum);
> >>>>>>>>> --
> >>>>>>>>> 2.15.0.55.gc2ece9dc4de6
> >>>>>>>>
> >>>>>>>> .
> >>>>>>>>
> >>>>>>
> >>>>>> .
> >>>>>>
> >>>
> >>> .
> >>>
> >
> > .
> >

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In reply to: Chao Yu: "Re: [PATCH v2] mkfs.f2fs: expand scalability of nat bitmap"
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