Bodo Eggert wrote:
Hiroyuki Machida <[email protected]> wrote:
For newly created and/or modified files/dirs, system can utilize
full posix attributes, because memory resident inode storage can
hold those. After umount-mount cycle, system may lose some
attributes to preserve VFAT format.
Inodes may be reclaimed, therefore you might also lose some attributes at
runtime. For your users, that will look like a heisenbug. A similar bug
has been reported for procfs. Is your implementation affected?
Yes.
Thank you, pointed it out. So I need to select
1) restric attribute even in mamory
or
2) pinn inode in memory during mount
(I think it's not good idea)
I'll revise the patch with 1).
- Special file
To distinguish special files, look if this fat dir entry
has ATTR_SYS, first. If it has ATTR_SYS, then check
1st. LSB bit in ctime_cs, refered as "special file flag".
If set, this file is created under VFAT with "posix_attr".
Look up TYPE field to decide special file type.
This spcial file detection mothod has some flaw to make
potential confusion. E.g. some system file created under
dos/win may be treated as special file. However in most case,
user don't create system file under dos/win.
You can add additional magic, e.g.: nodes must be empty, except for symlinks
which must be not larger than 4KB (current PATH_MAX?). This will get rid
of io.sys, logo.sys etc.\. If you want to be really sure, prepend a magic
code to the on-disk representation of symlinks.
Please confirm my understanding.
You sugessted that symlink should not have ATTR_SYS, to prevent
some over 4KB files created in DOS/WIN to be treated as symlinks?
--
Hiroyuki Machida [email protected]
SSW Dept. HENC, Sony Corp.
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