f2fs: support large nat bitmap (199bc3fe) · Commits · 戴 / test

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:

Chao Yu <yuchao0@huawei.com> Signed-off-by:

Jaegeuk Kim <jaegeuk@kernel.org>

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

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