“There is a limit of 32k (32768)
subdirectories in a single directory,
a limitation likely of only academic
interest,as many people don’t even
have that many files (though huge mail
servers may need to keep that in
mind). The ext2 inode specification
allows for over 100 trillion files to
reside in a single directory”

Further reading表明ext3没有32K的限制,可以凭经验证明

a=0; i=1; while [ $a == 0 ]; do touch $i; a=$?; let i++; done

但它确实有一个文件夹的32K文件夹限制,可以测试

a=0; i=1; while [ $a == 0 ]; do mkdir $i; a=$?; let i++; done

This (unfounded) claim说

ReiserFS has no trouble at all with
hundreds of thousands of files in a
single directory. flabdablet – February 1,2007

来自姐妹网站stackoverflow.com的This question也可以提供帮助.

一般来说：

>目录数量有限制,>你应该保持你的文件/目录在32K以下,但可以进一步,>您使用的文件系统很重要.