add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/exfat/namei.c
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@@ -398,7 +398,7 @@
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 		ei->i_size_ondisk += sbi->cluster_size;
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 		ei->i_size_aligned += sbi->cluster_size;
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 		ei->flags = p_dir->flags;
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-		inode->i_blocks += 1 << sbi->sect_per_clus_bits;
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+		inode->i_blocks += sbi->cluster_size >> 9;
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 	}
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 	return dentry;
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@@ -596,6 +596,8 @@
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 	struct exfat_inode_info *ei = EXFAT_I(dir);
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 	struct exfat_dentry *ep, *ep2;
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 	struct exfat_entry_set_cache *es;
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+	/* for optimized dir & entry to prevent long traverse of cluster chain */
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+	struct exfat_hint hint_opt;
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 	if (qname->len == 0)
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 		return -ENOENT;
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@@ -619,7 +621,7 @@
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 	/* search the file name for directories */
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 	dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
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-			num_entries, TYPE_ALL);
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+			num_entries, TYPE_ALL, &hint_opt);
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 	if (dentry < 0)
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 		return dentry; /* -error value */
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@@ -628,6 +630,11 @@
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 	info->entry = dentry;
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 	info->num_subdirs = 0;
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+	/* adjust cdir to the optimized value */
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+	cdir.dir = hint_opt.clu;
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+	if (cdir.flags & ALLOC_NO_FAT_CHAIN)
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+		cdir.size -= dentry / sbi->dentries_per_clu;
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+	dentry = hint_opt.eidx;
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 	es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
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 	if (!es)
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 		return -EIO;