---559023410-1804928587-918575861=:15410
Content-Type: TEXT/PLAIN; charset=US-ASCII
OK, folks. Preliminary version of rename patch is here. It's
against 2.2.2-pre2. Help in testing is extermely welcome - I don't have
access to many filesystems, so I can't test them myself. I'm very
suspicious about UMSDOS and HFS parts. I can (and will) test UMSDOS, but
HFS is out of reach for me. WARNING: CONFIG_NCPFS_STRONG ON SMBFS WILL NOT
WORK WITH rename() IN THIS VERSION. Everything else should (in theory)
work. Yup, it's my turn to get those brown paperbags. Please, test the
thing. Most likely it will break. More than in one place. Eating your
data, letting the magic smoke out of your harddisk, driving your dog mad
and causing global warming. You are warned. At least it compiles and
manages to boot (from ext2).
Anyway, in process I've caught quite a collection of bugs of varied
nastiness in nearly all *_rename() methods. At least something...
Patch is attached. Random stuff below being the list of changes /
comments. Ufff...
Al
include/linux/fs.h: added a semaphore to the end of struct super.
fs/super.c: added initialization of semaphore.
fs/namei.c: Divided vfs_rename into vfs_rename_dir and vfs_rename_other
Had put locking / checks into vfs_rename_dir().
Now, for filesystems:
adfs: no rename().
affs: wow. No rename/rename race prevention. OK, fixed the thing. BTW, where
does it flip '..'?
autofs: no rename().
coda: no rename/rename protection, no is_subdir. Mommy, server will do the
right thing, certainly it will not screw me up, why would it?
devpts: no rename().
ext2: Removed unneeded checks. BTW, if in case of directory move reading
the first block of source (for "..") failed it returned either
-EINVAL (if target was negative) or -EBUSY (if positive). Sheesh...
Changed to -EIO. Removed internal ext2 rename serialization (super.c,
ext2_fs_sb.h)
fat: Not a filesystem.
hfs: Hell knows how it works. No visible checks for *anything*. Oh well, did
minimal change (conditional d_move). HFS folks: you'ld better check
your stuff. Really. Sorry, I'm unable to read it. At least some
comments on *how* it works are in order, IMHO.
hpfs: no rename.
isofs: no rename.
lockd: not a filesystem.
minix: Way too rough serialization. Removed unneeded checks. I'm still not sure
that retries in {minix,sysv}_rename do not give a race. Later.
ncpfs: no checks at all. No serialization. Odd stuff with CONFIG_NCPFS_STRONG.
WARNING: support of NCPFS_STRONG is broken right now. FIXME!!!
nfs: no checks, no nothing. Fixed.
nfsd: not a filesystem.
nls: not a filesystem.
ntfs: no rename().
proc: no rename().
qnx4: no rename().
romfs: no rename().
smbfs: no checks at all. Fixed, except the POSIX breakage (target becoming
negative for a while).
sysv: Removed unneeded checks. Serialization was too rough.
ufs: same picture as with ext2.
vfat: Removed unneeded checks. Alas, not all of them went away. Darn aliases.
msdos: Fixed. Another change: now we don't flip inodes under dentry.
Finally. Sorry, but without that there was no way to fix umsdos
and remain even remotely sane.
umsdos: PERKELE! I have some opinion on the current state of this piece of
kernel, but it's completely unsuitable for family reading.
IOW: bloody mess. IMNSHO the *only* way to fix the thing goes through
support of layers on dcache level. Attempt to save on the number of
active dentries and fit two inodes into one leads to completely broken
code. To start with, it does a mind-boggling number of dcache lookups
and, what's worse, EMD lookups. What it will give in conjunction with
loop device or, heaven forbid, knfsd is, erm, unpleasant. Not to mention
the fact that the thing is hardly readable and does very odd things with
locking (deadlocks *are* there). Idea of symlinks having ->readpage()
is, to put it politely, unorthodoxal, but that's relatively minor
offence. Manipulations with struct file inside of the beast are very
interesting. Unfortunately they are very fragile too.
It's *not* a flame towards Matija - I'm amazed how one can
keep sanity working with such code. But dentry stuff in UMSDOS
really should be replaced by proper implementation of stackable
filesystem support in VFS. It would help in other places too, but
that's another story. I'll look whether it can be done without breaking
compatibility. I hope it is possible, at least for subset needed by
UMSDOS.
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