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Folks, I've produced something that pretends to fix the problems
with case-preserving & case-insensitive filesystems. In some respects it's
a gross hack. It seems to work and I'ld *really* like to hear some
feedback on the thing.
Nature of the problem: on case-insensitive but case-preserving
filesystems target of rename() should be treated in a special way.
Normally such filesystems treat names different only in capitalization as
synonims. Except for rename() target. We are using the same lookup() for
all cases and as the result lookups in rename("Foo","fOO"); bring us the
same dentry for source and target. With the obvious results. Another
related problem being that touch bar;mv foo Bar; is likely to rename foo
into bar. There is no really clean way to deal with that lossage -
semantics of rename() is incompatible with the case-braindamage exhibited
by those filesystems. Some approximation can be achieved in the following
way:
a) we are introducing new lookup flag: LOOKUP_TARGET (right thing
to do for completely unrelated reasons).
b) ->lookup() and ->d_compare() are getting the flags argument
(ditto). LOOKUP_TARGET reaches methods only on the last step of path.
c) filesystem may choose to implement stricter comparison in
d_compare() if LOOKUP_TARGET is passed.
d) in that case lookup() may do the following:
1) if we don't have a dentry for this object yet (even with the
different capitalization) - act as usual.
2) if we do - mark ->d_flags with DCACHE_VMS_LOSSAGE (sorry for
that name - AFAIK braindamage in question appeared in Vogon Made System),
set ->d_fsdata pointing to the existing alias, leave dentry unhashed and
return NULL.
e) for such filesystems ->rename() may get a dentry marked in
aforementioned way as a target. In that case we are guaranteed that it
bears the exact name we were asked for and ->d_fsdata points to the
normal dentry of the target (with a different capitalization).
I did ->lookup() and ->d_compare() type changes + required VFS
support + all changes needed to make it work in case of VFAT. Attached
patch is against the 2.2.9 + FAT patch (same as in 2.3.[23]). FAT patch
can be found on ftp.math.psu.edu/pub/firo/fat-patch-20.gz.
Why 2.2.9? Because for 2.3 I have a cleaner variant, but it
requires major dcache changes (needed for lots of other things anyway).
I'ld like to hear comments on the thing. I hate the idea of interface
changes in 2.2, but I *really* see no other way. If somebody have a
reasonable suggestion - you are more than welcome. I don't like the
proposed solution. Frankly, I'm sorely tempted to leave all this
case-perverted mess as is and to hell with mv Foo fOO; & Co. *If* it is
considered critical - well, solution is here.
Linus, decision belongs to you. Main changes are in fs/namei.c
(+ stuff in fs/vfat/namei.c, indeed). It's ugly, but I'm afraid that any
other fix will be even worse. Please, look it through.
Waiting for comments,
Al
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---559023410-1956884037-927693768=:1768--
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