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From: jacob@jblhome.ping.dk (Jacob Lorensen)
Newsgroups: comp.os.linux.development.system,comp.unix.bsd.freebsd.misc
Subject: Re: Ideal filesystem
Date: 27 Mar 1996 09:14:49 +0100
Organization: Jacobs home computer.
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References: <4hptj4$cf4@cville-srv.wam.umd.edu> <3140C968.20699696@netcom.com>
<4isubc$ri9@floyd.sw.oz.au> <4itvde$492@narses.hrz.tu-chemnitz.de>
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In-reply-to: kris@schulung.netuse.de's message of Sun, 24 Mar 1996 16:43:49
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>>>>> "kris" == =?ISO-8859-1?Q?Kristian K=F6hntopp?= <kris@schulung.netuse.de> writes:
kris> fachat@physik.tu-chemnitz.de (Andre Fachat) writes:
>> The only thing we have to do is - create a new file flag to
>> indicate 'hidden directory executable'
kris> To match with the UNIX approach, this flag has to be stored
kris> in the directory entry, not in the i-node. Otherwise a call
Eh? File attributes are certainly stored in the inode. A directory is
only a map from names to inode numbers.
In fact, Unix file systems can be viewed as containing only files and
inodes. The hierarchical directory abstraction and file name
abstraction is put ``on top'' of that.
kris> like readdir() would have to read the i-nodes of all files
kris> it is listing, which is very slow. So what is wrong with
kris> extensions?
ls stat()s all the files if it needs information on whether it is a
file or directory, if it has executable perimissions, who owns it,
etc. etc.
- From the readdir() man page:
struct dirent *readdir(DIR *dir);
- From /usr/include/linux/dirent.h
struct dirent {
long d_ino;
off_t d_off;
unsigned short d_reclen;
char d_name[NAME_MAX+1];
};
No file permission bits stored here...
Jacob.
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