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Subject[PATCH v2] mkfs.f2fs: expand scalability of nat bitmap
Date
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
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
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@huawei.com>
---
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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