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Commit 199bc3fe authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: support large nat bitmap 



Previously, we will store all nat version bitmap in checkpoint pack block,
so our total node entry number has a limitation which caused total node
number can not exceed (3900 * 8) block * 455 node/block = 14196000. So
that once user wants to create more nodes in large size image, it becomes
a bottleneck, that's unreasonable.

This patch detects the new layout of nat/sit version bitmap in image in
order to enable supporting large nat bitmap.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent bf617f7a

fs/f2fs/f2fs.h

+6 −0
Original line number Diff line number Diff line
@@ -1762,6 +1762,12 @@ 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(sbi, 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 (__cp_payload(sbi) > 0) {

		if (flag == NAT_BITMAP)

			return &ckpt->sit_nat_version_bitmap;

include/linux/f2fs_fs.h

+1 −0
Original line number Diff line number Diff line
@@ -116,6 +116,7 @@ struct f2fs_super_block { 
/*

 * For checkpoint

 */

#define CP_LARGE_NAT_BITMAP_FLAG	0x00000400

#define CP_NOCRC_RECOVERY_FLAG	0x00000200

#define CP_TRIMMED_FLAG		0x00000100

#define CP_NAT_BITS_FLAG	0x00000080